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work around linux not honoring write_at for O_APPEND files #143166

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@the8472 the8472 commented Jun 28, 2025 •
edited by rustbot
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the workaround only applies on kernels >= 6.9

fixes #140867

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rustbot commented Jun 28, 2025

r? @thomcc

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@rustbot rustbot added O-unix Operating system: Unix-like S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. T-libs Relevant to the library team, which will review and decide on the PR/issue. labels Jun 28, 2025
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@the8472 the8472 force-pushed the fix-write-at-append branch from b6ebbf6 to 8b87324 Compare June 29, 2025 14:48
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the8472 commented Jun 29, 2025

Weird, the kernel should be new enough.

@the8472 the8472 force-pushed the fix-write-at-append branch from 8b87324 to bd44b22 Compare June 30, 2025 21:59
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@the8472 the8472 force-pushed the fix-write-at-append branch from bd44b22 to 9e75dad Compare June 30, 2025 22:27
@rustbot rustbot added A-testsuite Area: The testsuite used to check the correctness of rustc T-infra Relevant to the infrastructure team, which will review and decide on the PR/issue. labels Jun 30, 2025
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@the8472 the8472 force-pushed the fix-write-at-append branch from 9e75dad to 0d89239 Compare June 30, 2025 23:05
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bors commented Jul 3, 2025

☔ The latest upstream changes (presumably #143294) made this pull request unmergeable. Please resolve the merge conflicts.

@the8472 the8472 force-pushed the fix-write-at-append branch from 0d89239 to 23ca6f2 Compare July 5, 2025 11:26
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@the8472 the8472 force-pushed the fix-write-at-append branch from 23ca6f2 to 614bbb8 Compare July 5, 2025 11:35
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@the8472 the8472 force-pushed the fix-write-at-append branch from 614bbb8 to f23f736 Compare July 5, 2025 12:02
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@the8472 the8472 force-pushed the fix-write-at-append branch from f23f736 to e8c7701 Compare July 5, 2025 12:22
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@the8472 the8472 force-pushed the fix-write-at-append branch from e8c7701 to 9b85793 Compare July 5, 2025 12:30
@the8472 the8472 force-pushed the fix-write-at-append branch from 9b85793 to 705d195 Compare July 5, 2025 12:51
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The job pr-check-2 failed! Check out the build log: (web) (plain enhanced) (plain)

Click to see the possible cause of the failure (guessed by this bot) 
  CACHE_DOMAIN: ci-caches.rust-lang.org
  PR_CI_JOB: 1
  IMAGE: pr-check-2
##[endgroup]
Linux fv-az2251-742 6.11.0-1015-azure #15~24.04.1-Ubuntu SMP Thu May  1 02:52:08 UTC 2025 x86_64 x86_64 x86_64 GNU/Linux
##[group]Run src/ci/scripts/collect-cpu-stats.sh
src/ci/scripts/collect-cpu-stats.sh
shell: /usr/bin/bash --noprofile --norc -e -o pipefail {0}
---
COPY scripts/sccache.sh /scripts/
RUN sh /scripts/sccache.sh

ENV SCRIPT \
        ldd --version && \
        python3 ../x.py test --stage 1 std -- "write_at" || \
        strace -ffe write,pwritev2,pwrite64,pwritev python3 ../x.py test --stage 1 std -- "write_at"
#!/bin/sh

# ignore-tidy-linelength

set -ex
---
DirectMap4k:      126912 kB
DirectMap2M:     6164480 kB
DirectMap1G:    12582912 kB
##[endgroup]
Executing ldd --version &&         python3 ../x.py test --stage 1 std -- write_at ||         strace -ffe write,pwritev2,pwrite64,pwritev python3 ../x.py test --stage 1 std -- write_at
+ ldd --version
ldd (Ubuntu GLIBC 2.35-0ubuntu3.10) 2.35
Copyright (C) 2022 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
Written by Roland McGrath and Ulrich Drepper.
+ python3 ../x.py test --stage 1 std -- write_at
##[group]Building bootstrap
    Finished `dev` profile [unoptimized] target(s) in 0.05s
##[endgroup]
downloading https://static.rust-lang.org/dist/2025-06-24/rustfmt-nightly-x86_64-unknown-linux-gnu.tar.xz
extracting /checkout/obj/build/cache/2025-06-24/rustfmt-nightly-x86_64-unknown-linux-gnu.tar.xz to /checkout/obj/build/x86_64-unknown-linux-gnu/rustfmt
---
failures:

---- fs::tests::file_test_append_write_at stdout ----

thread 'fs::tests::file_test_append_write_at' panicked at library/std/src/fs/tests.rs:510:5:
assertion `left == right` failed
  left: "it\'s not working!   "
 right: "it\'s     working!"
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace


failures:
    fs::tests::file_test_append_write_at

test result: FAILED. 1 passed; 1 failed; 0 ignored; 0 measured; 599 filtered out; finished in 657.35µs

error: test failed, to rerun pass `-p std --lib`
Build completed unsuccessfully in 0:08:06
+ strace -ffe write,pwritev2,pwrite64,pwritev python3 ../x.py test --stage 1 std -- write_at
strace: Process 14093 attached
[pid 14093] write(1, "Linux x86_64 x86_64\n", 20) = 20
[pid 14093] +++ exited with 0 +++
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=14093, si_uid=1001, si_status=0, si_utime=0, si_stime=0} ---
strace: Process 14094 attached
[pid 14094] write(1, "GNU/Linux\n", 10) = 10
[pid 14094] +++ exited with 0 +++
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=14094, si_uid=1001, si_status=0, si_utime=0, si_stime=0} ---
strace: Process 14095 attached
[pid 14095] write(1, "fd9ca711a3a0e2bd5bd33a345fa44393"..., 41) = 41
[pid 14095] +++ exited with 0 +++
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=14095, si_uid=1001, si_status=0, si_utime=0, si_stime=0} ---
##[group]Building bootstrap
write(1, "::group::Building bootstrap\n", 28) = 28
strace: Process 14096 attached
[pid 14096] pwrite64(9, "\0\0\0\0\0\0\0\0\0\0\0\0\211\337\207\305\0\0\0\31\0\0\2\0\0\0\20\0\0\0\0\0"..., 512, 0) = 512
[pid 14096] pwrite64(9, "\0\0\0\17", 4, 512) = 4
[pid 14096] pwrite64(9, "\r\0\0\0l\0\361\0\17\333\17\271\17\230\17z\17T\0174\17\26\16\370\16\332\16\270\16\226\16w"..., 4096, 516) = 4096
[pid 14096] pwrite64(9, "\211\337\214\316", 4, 4612) = 4
[pid 14096] pwrite64(9, "\0\0\0\24", 4, 4616) = 4
[pid 14096] pwrite64(9, "\r\0\0\0\202\1\35\0\17\336\17\272\17\230\17u\17\\\17@\17&\17\v\16\363\16\333\16\301\16\246"..., 4096, 4620) = 4096
[pid 14096] pwrite64(9, "\211\337\214N", 4, 8716) = 4
[pid 14096] pwrite64(9, "\0\0\0\1", 4, 8720) = 4
[pid 14096] pwrite64(9, "SQLite format 3\0\20\0\1\1\0@  \0\0\0\v\0\0\0\31"..., 4096, 8724) = 4096
[pid 14096] pwrite64(9, "\211\337\212(", 4, 12820) = 4
[pid 14096] pwrite64(9, "\331\325\5\371 \241c\327\0\0\0\3", 12, 0) = 12
[pid 14096] pwrite64(6, "SQLite format 3\0\20\0\1\1\0@  \0\0\0\f\0\0\0\31"..., 4096, 0) = 4096
[pid 14096] pwrite64(6, "\r\0\0\0l\0\361\0\17\333\17\271\17\230\17z\17T\0174\17\26\16\370\16\332\16\270\16\226\16w"..., 4096, 57344) = 4096
[pid 14096] pwrite64(6, "\r\0\0\0\202\1\35\0\17\336\17\272\17\230\17u\17\\\17@\17&\17\v\16\363\16\333\16\301\16\246"..., 4096, 77824) = 4096
[pid 14096] write(9, "||||", 4)         = 4
strace: Process 14097 attached
[pid 14096] write(2, "    Finished", 12    Finished) = 12
[pid 14096] write(2, " `dev` profile [unoptimized] tar"..., 48 `dev` profile [unoptimized] target(s) in 0.25s
) = 48
[pid 14096] write(9, "|", 1)            = 1
[pid 14096] write(9, "|", 1)            = 1
[pid 14096] write(9, "|", 1)            = 1
[pid 14097] --- SIGUSR1 {si_signo=SIGUSR1, si_code=SI_TKILL, si_pid=14096, si_uid=1001} ---
[pid 14097] write(9, "|", 1)            = 1
[pid 14097] write(9, "|", 1)            = 1
[pid 14097] write(9, "|", 1)            = 1
[pid 14097] +++ exited with 0 +++
[pid 14096] write(12, "/checkout/obj/build/bootstrap/de"..., 3580) = 3580
[pid 14096] write(12, "/checkout/obj/build/bootstrap/de"..., 3612) = 3612
[pid 14096] write(12, "/checkout/obj/build/bootstrap/de"..., 3662) = 3662
[pid 14096] write(12, "/checkout/obj/build/bootstrap/de"..., 3613) = 3613
[pid 14096] +++ exited with 0 +++
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=14096, si_uid=1001, si_status=0, si_utime=3, si_stime=7} ---
write(1, "::endgroup::\n", 13)          = 13
##[endgroup]
strace: Process 14098 attached
strace: Process 14099 attached
[pid 14099] write(1, "../\n", 4)        = 4
[pid 14099] +++ exited with 0 +++
[pid 14098] --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=14099, si_uid=1001, si_status=0, si_utime=0, si_stime=0} ---
strace: Process 14100 attached
[pid 14100] +++ exited with 0 +++
[pid 14098] --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=14100, si_uid=1001, si_status=0, si_utime=0, si_stime=0} ---
strace: Process 14101 attached
strace: Process 14102 attached
strace: Process 14103 attached
[pid 14101] write(1, "2025-07-05", 10)  = 10
[pid 14101] +++ exited with 0 +++
[pid 14098] --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=14101, si_uid=1001, si_status=0, si_utime=0, si_stime=0} ---
[pid 14102] write(1, "af116d1d46fbfa7e9b73c93c1bc8467d"..., 41) = 41
[pid 14102] +++ exited with 0 +++
[pid 14098] --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=14102, si_uid=1001, si_status=0, si_utime=0, si_stime=0} ---
[pid 14103] write(1, "af116d1d4\n", 10) = 10
[pid 14103] +++ exited with 0 +++
[pid 14098] --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=14103, si_uid=1001, si_status=0, si_utime=0, si_stime=0} ---
strace: Process 14104 attached
strace: Process 14105 attached
[pid 14104] write(6, "||||||||||||||||||||||||||||||||", 32) = 32
strace: Process 14106 attached
strace: Process 14107 attached
[pid 14106] write(1, "/checkout/obj/build/x86_64-unkno"..., 52) = 52
[pid 14106] +++ exited with 0 +++
[pid 14107] +++ exited with 0 +++
[pid 14105] +++ exited with 0 +++
[pid 14104] +++ exited with 0 +++
[pid 14098] --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=14104, si_uid=1001, si_status=0, si_utime=0, si_stime=2} ---
strace: Process 14108 attached
[pid 14108] +++ exited with 0 +++
[pid 14098] --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=14108, si_uid=1001, si_status=0, si_utime=0, si_stime=0} ---
strace: Process 14109 attached
strace: Process 14110 attached
strace: Process 14111 attached
[pid 14109] write(1, "2025-06-28", 10)  = 10
[pid 14109] +++ exited with 0 +++
[pid 14098] --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=14109, si_uid=1001, si_status=0, si_utime=0, si_stime=0} ---
[pid 14110] write(1, "930b4f62cfcd1f0eabdb30a56d91bf68"..., 41) = 41
[pid 14110] +++ exited with 0 +++
[pid 14098] --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=14110, si_uid=1001, si_status=0, si_utime=0, si_stime=0} ---
[pid 14111] write(1, "930b4f62c\n", 10) = 10
[pid 14111] +++ exited with 0 +++
[pid 14098] --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=14111, si_uid=1001, si_status=0, si_utime=0, si_stime=0} ---
strace: Process 14112 attached
[pid 14112] +++ exited with 0 +++
[pid 14098] --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=14112, si_uid=1001, si_status=0, si_utime=0, si_stime=0} ---
strace: Process 14113 attached
strace: Process 14114 attached
strace: Process 14115 attached
[pid 14113] write(1, "2025-06-23", 10)  = 10
[pid 14113] +++ exited with 0 +++
[pid 14098] --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=14113, si_uid=1001, si_status=0, si_utime=0, si_stime=0} ---
[pid 14114] write(1, "b5098d515d5e1bd0f5470553bc0d18da"..., 41) = 41
[pid 14114] +++ exited with 0 +++
[pid 14098] --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=14114, si_uid=1001, si_status=0, si_utime=0, si_stime=0} ---
[pid 14115] write(1, "b5098d515\n", 10) = 10
[pid 14115] +++ exited with 0 +++
[pid 14098] --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=14115, si_uid=1001, si_status=0, si_utime=0, si_stime=0} ---
strace: Process 14116 attached
[pid 14116] +++ exited with 0 +++
[pid 14098] --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=14116, si_uid=1001, si_status=0, si_utime=0, si_stime=0} ---
strace: Process 14117 attached
strace: Process 14118 attached
strace: Process 14119 attached
[pid 14117] write(1, "2025-06-13", 10)  = 10
[pid 14117] +++ exited with 0 +++
[pid 14098] --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=14117, si_uid=1001, si_status=0, si_utime=0, si_stime=0} ---
[pid 14118] write(1, "ed6566573eb21b00a3f87815e14ff766"..., 41) = 41
[pid 14118] +++ exited with 0 +++
[pid 14098] --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=14118, si_uid=1001, si_status=0, si_utime=0, si_stime=0} ---
[pid 14119] write(1, "ed6566573\n", 10) = 10
[pid 14119] +++ exited with 0 +++
[pid 14098] --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=14119, si_uid=1001, si_status=0, si_utime=0, si_stime=0} ---
strace: Process 14120 attached
[pid 14120] +++ exited with 0 +++
[pid 14098] --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=14120, si_uid=1001, si_status=0, si_utime=0, si_stime=0} ---
strace: Process 14121 attached
strace: Process 14122 attached
strace: Process 14123 attached
[pid 14121] write(1, "2025-04-30", 10)  = 10
[pid 14121] +++ exited with 0 +++
[pid 14098] --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=14121, si_uid=1001, si_status=0, si_utime=0, si_stime=0} ---
[pid 14122] write(1, "04ce66d8c918de9273bd7101638ad872"..., 41) = 41
[pid 14122] +++ exited with 0 +++
[pid 14098] --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=14122, si_uid=1001, si_status=0, si_utime=0, si_stime=0} ---
[pid 14123] write(1, "04ce66d8c\n", 10) = 10
[pid 14123] +++ exited with 0 +++
[pid 14098] --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=14123, si_uid=1001, si_status=0, si_utime=0, si_stime=0} ---
strace: Process 14124 attached
[pid 14124] write(1, "fd9ca711a3a0e2bd5bd33a345fa44393"..., 41) = 41
[pid 14124] +++ exited with 0 +++
[pid 14098] --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=14124, si_uid=1001, si_status=0, si_utime=0, si_stime=0} ---
strace: Process 14125 attached
strace: Process 14126 attached
strace: Process 14127 attached
[pid 14126] +++ exited with 0 +++
strace: Process 14128 attached
strace: Process 14129 attached
[pid 14128] +++ exited with 0 +++
[pid 14129] +++ exited with 0 +++
[pid 14127] +++ exited with 0 +++
strace: Process 14130 attached
strace: Process 14131 attached
[pid 14130] +++ exited with 0 +++
strace: Process 14132 attached
[pid 14131] +++ exited with 0 +++
[pid 14132] +++ exited with 0 +++
strace: Process 14133 attached
strace: Process 14134 attached
[pid 14133] +++ exited with 0 +++
strace: Process 14135 attached
[pid 14134] +++ exited with 0 +++
strace: Process 14136 attached
[pid 14135] +++ exited with 0 +++
strace: Process 14137 attached
[pid 14136] +++ exited with 0 +++
strace: Process 14138 attached
[pid 14137] +++ exited with 0 +++
[pid 14138] +++ exited with 0 +++
strace: Process 14139 attached
strace: Process 14140 attached
[pid 14139] +++ exited with 0 +++
strace: Process 14141 attached
[pid 14140] +++ exited with 0 +++
strace: Process 14142 attached
[pid 14141] +++ exited with 0 +++
strace: Process 14143 attached
[pid 14142] +++ exited with 0 +++
strace: Process 14144 attached
[pid 14143] +++ exited with 0 +++
strace: Process 14145 attached
[pid 14144] +++ exited with 0 +++
[pid 14145] +++ exited with 0 +++
strace: Process 14146 attached
strace: Process 14147 attached
strace: Process 14148 attached
strace: Process 14149 attached
strace: Process 14150 attached
strace: Process 14151 attached
strace: Process 14152 attached
strace: Process 14153 attached
strace: Process 14154 attached
strace: Process 14155 attached
strace: Process 14156 attached
strace: Process 14157 attached
strace: Process 14158 attached
strace: Process 14159 attached
strace: Process 14160 attached
strace: Process 14161 attached
strace: Process 14162 attached
strace: Process 14163 attached
strace: Process 14164 attached
strace: Process 14165 attached
strace: Process 14166 attached
[pid 14158] +++ exited with 0 +++
[pid 14160] +++ exited with 0 +++
[pid 14159] +++ exited with 0 +++
[pid 14161] +++ exited with 0 +++
[pid 14162] +++ exited with 0 +++
[pid 14163] +++ exited with 0 +++
[pid 14157] +++ exited with 0 +++
[pid 14152] +++ exited with 0 +++
[pid 14151] +++ exited with 0 +++
[pid 14148] +++ exited with 0 +++
[pid 14164] +++ exited with 0 +++
[pid 14150] +++ exited with 0 +++
[pid 14147] +++ exited with 0 +++
[pid 14155] +++ exited with 0 +++
[pid 14166] +++ exited with 0 +++
[pid 14153] +++ exited with 0 +++
[pid 14156] +++ exited with 0 +++
[pid 14154] +++ exited with 0 +++
[pid 14165] +++ exited with 0 +++
[pid 14149] +++ exited with 0 +++
[pid 14146] +++ exited with 0 +++
[pid 14125] --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=14146, si_uid=1001, si_status=0, si_utime=17, si_stime=215} ---
[pid 14125] +++ exited with 0 +++
[pid 14098] --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=14125, si_uid=1001, si_status=0, si_utime=0, si_stime=1} ---
[pid 14098] write(3, "14098", 5)        = 5
strace: Process 14167 attached
strace: Process 14168 attached
[pid 14167] write(6, "||||||||||||||||||||||||||||||||", 32) = 32
strace: Process 14169 attached
strace: Process 14170 attached
[pid 14169] write(1, "/checkout/obj/build/x86_64-unkno"..., 93) = 93
[pid 14169] +++ exited with 0 +++
[pid 14170] +++ exited with 0 +++
[pid 14168] +++ exited with 0 +++
[pid 14167] +++ exited with 0 +++
[pid 14098] --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=14167, si_uid=1001, si_status=0, si_utime=0, si_stime=1} ---
strace: Process 14171 attached
strace: Process 14172 attached
[pid 14171] write(1, "rustc 1.89.0-beta.1 (390a0ab5d 2"..., 43) = 43
[pid 14171] write(1, "binary: rustc\n", 14) = 14
[pid 14171] write(1, "commit-hash: 390a0ab5dc4a895235a"..., 54) = 54
[pid 14171] write(1, "commit-date: 2025-06-23\n", 24) = 24
[pid 14171] write(1, "host: x86_64-unknown-linux-gnu\n", 31) = 31
[pid 14171] write(1, "release: 1.89.0-beta.1\n", 23) = 23
[pid 14171] write(1, "LLVM version: 20.1.7\n", 21) = 21
[pid 14172] +++ exited with 0 +++
[pid 14171] +++ exited with 0 +++
[pid 14098] --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=14171, si_uid=1001, si_status=0, si_utime=0, si_stime=1} ---
[pid 14098] write(4, "#ifdef __clang__\n#pragma message"..., 206) = 206
strace: Process 14173 attached
strace: Process 14174 attached
[pid 14174] write(1, "# 0 \"/tmp/15818296013513663150de"..., 304) = 304
[pid 14174] +++ exited with 0 +++
[pid 14173] --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=14174, si_uid=1001, si_status=0, si_utime=0, si_stime=0} ---
[pid 14173] +++ exited with 0 +++
[pid 14098] --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=14173, si_uid=1001, si_status=0, si_utime=0, si_stime=0} ---
strace: Process 14175 attached
[pid 14175] write(2, "cc: error: unrecognized command-"..., 53) = 53
[pid 14175] write(2, "cc: fatal error: no input files\n", 32) = 32
[pid 14175] write(2, "compilation terminated.\n", 24) = 24
[pid 14175] +++ exited with 1 +++
[pid 14098] --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=14175, si_uid=1001, si_status=1, si_utime=0, si_stime=0} ---
[pid 14098] write(4, "#ifdef __clang__\n#pragma message"..., 206) = 206
strace: Process 14176 attached
strace: Process 14177 attached
[pid 14177] write(1, "# 0 \"/tmp/17034492984951169818de"..., 304) = 304
[pid 14177] +++ exited with 0 +++
[pid 14176] --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=14177, si_uid=1001, si_status=0, si_utime=0, si_stime=0} ---
[pid 14176] +++ exited with 0 +++
[pid 14098] --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=14176, si_uid=1001, si_status=0, si_utime=0, si_stime=0} ---
strace: Process 14178 attached
[pid 14178] write(2, "c++: error: unrecognized command"..., 54) = 54
[pid 14178] write(2, "c++: fatal error: no input files"..., 33) = 33
[pid 14178] write(2, "compilation terminated.\n", 24) = 24
[pid 14178] +++ exited with 1 +++
[pid 14098] --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=14178, si_uid=1001, si_status=1, si_utime=0, si_stime=0} ---
strace: Process 14179 attached
[pid 14179] write(1, "libstdc++ version: 11\n", 22) = 22
[pid 14179] +++ exited with 0 +++
[pid 14098] --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=14179, si_uid=1001, si_status=0, si_utime=0, si_stime=0} ---
[pid 14098] write(1, "[TIMING] core::build_steps::tool"..., 98[TIMING] core::build_steps::tool::LibcxxVersionTool { target: x86_64-unknown-linux-gnu } -- 0.008
) = 98
strace: Process 14180 attached
strace: Process 14181 attached
[pid 14180] write(6, "||||||||||||||||||||||||||||||||", 32) = 32
strace: Process 14182 attached
strace: Process 14183 attached
[pid 14182] write(1, "aarch64-apple-darwin\naarch64-app"..., 7004) = 7004
[pid 14182] +++ exited with 0 +++
[pid 14183] +++ exited with 0 +++
[pid 14181] +++ exited with 0 +++
[pid 14180] +++ exited with 0 +++
[pid 14098] --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=14180, si_uid=1001, si_status=0, si_utime=0, si_stime=2} ---
strace: Process 14184 attached
[pid 14184] write(1, "{\"packages\":[{\"name\":\"rustc-main"..., 389850) = 389850
[pid 14184] write(1, "\n", 1)           = 1
[pid 14184] +++ exited with 0 +++
[pid 14098] --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=14184, si_uid=1001, si_status=0, si_utime=2, si_stime=3} ---
strace: Process 14185 attached
[pid 14185] write(1, "{\"packages\":[{\"name\":\"std\",\"vers"..., 33762) = 33762
[pid 14185] write(1, "\n", 1)           = 1
[pid 14185] +++ exited with 0 +++
[pid 14098] --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=14185, si_uid=1001, si_status=0, si_utime=1, si_stime=0} ---
[pid 14098] write(1, "[TIMING] core::build_steps::comp"..., 170) = 170
[TIMING] core::build_steps::compile::Sysroot { compiler: Compiler { stage: 1, host: x86_64-unknown-linux-gnu, forced_compiler: false }, force_recompile: false } -- 0.005
[pid 14098] write(1, "[TIMING] core::builder::Libdir {"..., 166) = 166
[TIMING] core::builder::Libdir { compiler: Compiler { stage: 1, host: x86_64-unknown-linux-gnu, forced_compiler: false }, target: x86_64-unknown-linux-gnu } -- 0.000
strace: Process 14186 attached
[pid 14186] write(1, "20.1.7-rust-1.90.0-nightly\n", 27) = 27
[pid 14186] +++ exited with 0 +++
[pid 14098] --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=14186, si_uid=1001, si_status=0, si_utime=0, si_stime=0} ---
[pid 14098] write(1, "[TIMING] core::build_steps::llvm"..., 85[TIMING] core::build_steps::llvm::Llvm { target: x86_64-unknown-linux-gnu } -- 0.014
) = 85
strace: Process 14187 attached
[pid 14187] write(1, "/checkout/obj/build/x86_64-unkno"..., 57) = 57
[pid 14187] +++ exited with 0 +++
[pid 14098] --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=14187, si_uid=1001, si_status=0, si_utime=0, si_stime=0} ---
[pid 14098] write(2, "/checkout/obj/build/x86_64-unkno"..., 67/checkout/obj/build/x86_64-unknown-linux-gnu/ci-llvm/bin/llvm-strip) = 67
[pid 14098] write(2, " does not exist; skipping copy\n", 31 does not exist; skipping copy
) = 31
[pid 14098] write(1, "[TIMING] core::build_steps::comp"..., 154) = 154
[TIMING] core::build_steps::compile::Assemble { target_compiler: Compiler { stage: 0, host: x86_64-unknown-linux-gnu, forced_compiler: false } } -- 0.000
strace: Process 14188 attached
[pid 14188] write(1, "/checkout/obj/build/x86_64-unkno"..., 91) = 91
[pid 14188] +++ exited with 0 +++
[pid 14098] --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=14188, si_uid=1001, si_status=0, si_utime=0, si_stime=1} ---
[pid 14098] write(4, "INPUT(", 6)       = 6
[pid 14098] write(4, "libLLVM.so.20.1-rust-1.90.0-nigh"..., 35) = 35
[pid 14098] write(4, ")\n", 2)          = 2
[TIMING] core::build_steps::compile::Sysroot { compiler: Compiler { stage: 0, host: x86_64-unknown-linux-gnu, forced_compiler: false }, force_recompile: false } -- 0.032
[pid 14098] write(1, "[TIMING] core::build_steps::comp"..., 170) = 170
[pid 14098] write(4, "INPUT(", 6)       = 6
[pid 14098] write(4, "libLLVM.so.20.1-rust-1.90.0-nigh"..., 35) = 35
[pid 14098] write(4, ")\n", 2)          = 2
[TIMING] core::builder::Libdir { compiler: Compiler { stage: 0, host: x86_64-unknown-linux-gnu, forced_compiler: false }, target: x86_64-unknown-linux-gnu } -- 0.004
[pid 14098] write(1, "[TIMING] core::builder::Libdir {"..., 166) = 166
[pid 14098] write(1, "[TIMING] core::build_steps::comp"..., 312) = 312
[TIMING] core::build_steps::compile::StdLink { compiler: Compiler { stage: 0, host: x86_64-unknown-linux-gnu, forced_compiler: false }, target_compiler: Compiler { stage: 0, host: x86_64-unknown-linux-gnu, forced_compiler: false }, target: x86_64-unknown-linux-gnu, crates: [], force_recompile: false } -- 0.013
[pid 14098] write(1, "::group::Building compiler artif"..., 82) = 82
##[group]Building compiler artifacts (stage0 -> stage1, x86_64-unknown-linux-gnu)
strace: Process 14189 attached
[pid 14189] pwrite64(9, "\0\0\0\0\0\0\0\0\0\0\0\0\v\356\311T\0\0\0\31\0\0\2\0\0\0\20\0\0\0\0\0"..., 512, 0) = 512
[pid 14189] pwrite64(9, "\0\0\0\20", 4, 512) = 4
[pid 14189] pwrite64(9, "\r\0\0\0i\1\10\0\17\341\17\272\17\224\17q\17P\17)\17\n\16\351\16\277\16\224\16p\16L"..., 4096, 516) = 4096
[pid 14189] pwrite64(9, "\v\356\317\301", 4, 4612) = 4
[pid 14189] pwrite64(9, "\0\0\0\17", 4, 4616) = 4
[pid 14189] pwrite64(9, "\r\0\0\0l\0\361\0\17\333\17\271\17\230\17z\17T\0174\17\26\16\370\16\332\16\270\16\226\16w"..., 4096, 4620) = 4096
[pid 14189] pwrite64(9, "\v\356\316]", 4, 8716) = 4
[pid 14189] pwrite64(9, "\0\0\0\23", 4, 8720) = 4
[pid 14189] pwrite64(9, "\r\0\0\0`\1s\0\17\317\17\255\17\212\17i\17B\17!\16\372\16\305\16\232\16z\16X\0164"..., 4096, 8724) = 4096
[pid 14189] pwrite64(9, "\v\356\317\204", 4, 12820) = 4
[pid 14189] pwrite64(9, "\0\0\0\24", 4, 12824) = 4
[pid 14189] pwrite64(9, "\r\0\0\0\202\1\35\0\17\336\17\272\17\230\17u\17\\\17@\17&\17\v\16\363\16\333\16\301\16\246"..., 4096, 12828) = 4096
[pid 14189] pwrite64(9, "\v\356\315\336", 4, 16924) = 4
[pid 14189] pwrite64(9, "\0\0\0\25", 4, 16928) = 4
[pid 14189] pwrite64(9, "\r\0\0\0v\1\3\0\17\336\17\271\17\231\17z\17W\0177\17\34\17\0\16\347\16\301\16\250\16\206"..., 4096, 16932) = 4096
[pid 14189] pwrite64(9, "\v\356\316\346", 4, 21028) = 4
[pid 14189] pwrite64(9, "\0\0\0\1", 4, 21032) = 4
[pid 14189] pwrite64(9, "SQLite format 3\0\20\0\1\1\0@  \0\0\0\f\0\0\0\31"..., 4096, 21036) = 4096
[pid 14189] pwrite64(9, "\v\356\313\267", 4, 25132) = 4
[pid 14189] pwrite64(9, "\331\325\5\371 \241c\327\0\0\0\6", 12, 0) = 12
[pid 14189] pwrite64(6, "SQLite format 3\0\20\0\1\1\0@  \0\0\0\r\0\0\0\31"..., 4096, 0) = 4096
[pid 14189] pwrite64(6, "\r\0\0\0l\0\361\0\17\333\17\271\17\230\17z\17T\0174\17\26\16\370\16\332\16\270\16\226\16w"..., 4096, 57344) = 4096
[pid 14189] pwrite64(6, "\r\0\0\0i\1\10\0\17\341\17\272\17\224\17q\17P\17)\17\n\16\351\16\277\16\224\16p\16L"..., 4096, 61440) = 4096
[pid 14189] pwrite64(6, "\r\0\0\0`\1s\0\17\317\17\255\17\212\17i\17B\17!\16\372\16\305\16\232\16z\16X\0164"..., 4096, 73728) = 4096
[pid 14189] pwrite64(6, "\r\0\0\0\202\1\35\0\17\336\17\272\17\230\17u\17\\\17@\17&\17\v\16\363\16\333\16\301\16\246"..., 4096, 77824) = 4096
[pid 14189] pwrite64(6, "\r\0\0\0v\1\3\0\17\336\17\271\17\231\17z\17W\0177\17\34\17\0\16\347\16\301\16\250\16\206"..., 4096, 81920) = 4096
[pid 14189] write(9, "||||", 4)         = 4
strace: Process 14190 attached
[pid 14189] write(2, "[RUSTC-TIMING] build_script_buil"..., 50[RUSTC-TIMING] build_script_build test:false 0.200) = 50
[pid 14189] write(2, "\n", 1
)           = 1
[pid 14189] write(1, "{\"reason\":\"compiler-artifact\",\"p"..., 762) = 762
[pid 14189] write(1, "{\"reason\":\"build-script-executed"..., 311) = 311
[pid 14189] write(2, "[RUSTC-TIMING] unicode_ident tes"..., 45[RUSTC-TIMING] unicode_ident test:false 0.053) = 45
[pid 14189] write(2, "\n", 1
)           = 1
[pid 14189] write(1, "{\"reason\":\"compiler-artifact\",\"p"..., 834) = 834
[pid 14189] write(2, "[RUSTC-TIMING] cfg_if test:false"..., 38[RUSTC-TIMING] cfg_if test:false 0.026) = 38
[pid 14189] write(2, "\n", 1
)           = 1
[pid 14189] write(1, "{\"reason\":\"compiler-artifact\",\"p"..., 839) = 839
[pid 14189] write(2, "[RUSTC-TIMING] build_script_buil"..., 50[RUSTC-TIMING] build_script_build test:false 0.215) = 50
[pid 14189] write(2, "\n", 1
)           = 1
[pid 14189] write(1, "{\"reason\":\"compiler-artifact\",\"p"..., 745) = 745
[pid 14189] write(2, "[RUSTC-TIMING] proc_macro2 test:"..., 43[RUSTC-TIMING] proc_macro2 test:false 0.561) = 43
[pid 14189] write(2, "\n", 1
)           = 1
[pid 14189] write(1, "{\"reason\":\"compiler-artifact\",\"p"..., 844) = 844
[pid 14189] write(1, "{\"reason\":\"build-script-executed"..., 340) = 340
[pid 14189] write(2, "[RUSTC-TIMING] memchr test:false"..., 38[RUSTC-TIMING] memchr test:false 1.231) = 38
[pid 14189] write(2, "\n", 1
)           = 1
[pid 14189] write(1, "{\"reason\":\"compiler-artifact\",\"p"..., 862) = 862
[pid 14189] write(2, "[RUSTC-TIMING] shlex test:false "..., 37[RUSTC-TIMING] shlex test:false 0.117) = 37
[pid 14189] write(2, "\n", 1
)           = 1
[pid 14189] write(1, "{\"reason\":\"compiler-artifact\",\"p"..., 798) = 798
[pid 14189] write(2, "[RUSTC-TIMING] quote test:false "..., 37[RUSTC-TIMING] quote test:false 0.248) = 37
[pid 14189] write(2, "\n", 1
)           = 1
[pid 14189] write(1, "{\"reason\":\"compiler-artifact\",\"p"..., 808) = 808
[pid 14189] write(2, "[RUSTC-TIMING] libc test:false 1"..., 36[RUSTC-TIMING] libc test:false 1.661) = 36
[pid 14189] write(2, "\n", 1
)           = 1
[pid 14189] write(1, "{\"reason\":\"compiler-artifact\",\"p"..., 863) = 863
[pid 14189] write(2, "[RUSTC-TIMING] cc test:false 1.1"..., 34[RUSTC-TIMING] cc test:false 1.133) = 34
[pid 14189] write(2, "\n", 1
)           = 1
[pid 14189] write(1, "{\"reason\":\"compiler-artifact\",\"p"..., 768) = 768
[pid 14189] write(2, "[RUSTC-TIMING] stable_deref_trai"..., 50[RUSTC-TIMING] stable_deref_trait test:false 0.031) = 50
[pid 14189] write(2, "\n", 1
)           = 1
[pid 14189] write(1, "{\"reason\":\"compiler-artifact\",\"p"..., 934) = 934
[pid 14189] write(2, "[RUSTC-TIMING] syn test:false 3."..., 35[RUSTC-TIMING] syn test:false 3.819) = 35
[pid 14189] write(2, "\n", 1
)           = 1
[pid 14189] write(1, "{\"reason\":\"compiler-artifact\",\"p"..., 892) = 892
[pid 14189] write(2, "[RUSTC-TIMING] smallvec test:fal"..., 40[RUSTC-TIMING] smallvec test:false 0.217) = 40
[pid 14189] write(2, "\n", 1
)           = 1
[pid 14189] write(1, "{\"reason\":\"compiler-artifact\",\"p"..., 891) = 891
[pid 14189] write(2, "[RUSTC-TIMING] bitflags test:fal"..., 40[RUSTC-TIMING] bitflags test:false 0.337) = 40
[pid 14189] write(2, "\n", 1
)           = 1
[pid 14189] write(1, "{\"reason\":\"compiler-artifact\",\"p"..., 856) = 856
[pid 14189] write(2, "[RUSTC-TIMING] foldhash test:fal"..., 40[RUSTC-TIMING] foldhash test:false 0.146) = 40
[pid 14189] write(2, "\n", 1
)           = 1
[pid 14189] write(1, "{\"reason\":\"compiler-artifact\",\"p"..., 851) = 851
[pid 14189] write(2, "[RUSTC-TIMING] synstructure test"..., 44[RUSTC-TIMING] synstructure test:false 0.412) = 44
[pid 14189] write(2, "\n", 1
)           = 1
[pid 14189] write(1, "{\"reason\":\"compiler-artifact\",\"p"..., 850) = 850
[pid 14189] write(2, "[RUSTC-TIMING] displaydoc test:f"..., 42[RUSTC-TIMING] displaydoc test:false 0.670) = 42
[pid 14189] write(2, "\n", 1
)           = 1
[pid 14189] write(1, "{\"reason\":\"compiler-artifact\",\"p"..., 715) = 715
[pid 14189] write(2, "[RUSTC-TIMING] equivalent test:f"..., 42[RUSTC-TIMING] equivalent test:false 0.045) = 42
[pid 14189] write(2, "\n", 1
)           = 1
[pid 14189] write(1, "{\"reason\":\"compiler-artifact\",\"p"..., 863) = 863
[pid 14189] write(2, "[RUSTC-TIMING] allocator_api2 te"..., 46[RUSTC-TIMING] allocator_api2 test:false 0.357) = 46
[pid 14189] write(2, "\n", 1
)           = 1
[pid 14189] write(1, "{\"reason\":\"compiler-artifact\",\"p"..., 897) = 897
[pid 14189] write(2, "[RUSTC-TIMING] once_cell test:fa"..., 41[RUSTC-TIMING] once_cell test:false 0.165) = 41
[pid 14189] write(2, "\n", 1
)           = 1
[pid 14189] write(1, "{\"reason\":\"compiler-artifact\",\"p"..., 890) = 890
[pid 14189] write(2, "[RUSTC-TIMING] hashbrown test:fa"..., 41[RUSTC-TIMING] hashbrown test:false 0.698) = 41
[pid 14189] write(2, "\n", 1
)           = 1
[pid 14189] write(1, "{\"reason\":\"compiler-artifact\",\"p"..., 952) = 952
[pid 14189] write(2, "[RUSTC-TIMING] build_script_buil"..., 50[RUSTC-TIMING] build_script_build test:false 0.239) = 50
[pid 14189] write(2, "\n", 1
)           = 1
[pid 14189] write(1, "{\"reason\":\"compiler-artifact\",\"p"..., 734) = 734
[pid 14189] write(2, "[RUSTC-TIMING] autocfg test:fals"..., 39[RUSTC-TIMING] autocfg test:false 0.231) = 39
[pid 14189] write(2, "\n", 1
)           = 1
[pid 14189] write(1, "{\"reason\":\"compiler-artifact\",\"p"..., 795) = 795
[pid 14189] write(2, "[RUSTC-TIMING] indexmap test:fal"..., 40[RUSTC-TIMING] indexmap test:false 0.754) = 40
[pid 14189] write(2, "\n", 1
)           = 1
[pid 14189] write(1, "{\"reason\":\"compiler-artifact\",\"p"..., 869) = 869
[pid 14189] write(2, "[RUSTC-TIMING] build_script_buil"..., 50[RUSTC-TIMING] build_script_build test:false 0.196) = 50
[pid 14189] write(2, "\n", 1
)           = 1
[pid 14189] write(1, "{\"reason\":\"compiler-artifact\",\"p"..., 752) = 752
[pid 14189] write(1, "{\"reason\":\"build-script-executed"..., 314) = 314
[pid 14189] write(2, "[RUSTC-TIMING] build_script_buil"..., 50[RUSTC-TIMING] build_script_build test:false 0.256) = 50
[pid 14189] write(2, "\n", 1

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the8472 commented Jul 5, 2025 •
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At this point I'm fairly sure this is a kernel bug in the runner. Tests pass locally, the pwritev2 also happens in CI and doesn't return an error, meaning the flag should be supported.

Filed actions/runner-images#12530

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Issue with write_all_at on GitHub Action
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