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78 lines
3.9 KiB
78 lines
3.9 KiB
1 month ago
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From 803900bb830163c13539a70ea56d82d27b06f52b Mon Sep 17 00:00:00 2001
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From: Frantisek Sumsal <frantisek@sumsal.cz>
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Date: Fri, 2 Jun 2023 13:24:32 +0200
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Subject: [PATCH] test: sync with the fake binary before killing it
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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On faster machines we might be too fast and kill the fake binary during
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fork() which then makes kernel report a "wrong" binary in the coredump,
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e.g.:
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[ 31.408078] testsuite-74.sh[548]: + /tmp/make-dump /tmp/test-dump SIGTRAP
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[ 31.409720] testsuite-74.sh[560]: + bin=/tmp/test-dump
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[ 31.409720] testsuite-74.sh[560]: + sig=SIGTRAP
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[ 31.409720] testsuite-74.sh[560]: + ulimit -c unlimited
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[ 31.409720] testsuite-74.sh[560]: + pid=561
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[ 31.409720] testsuite-74.sh[560]: + sleep 1
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[ 31.409720] testsuite-74.sh[560]: + kill -s SIGTRAP 561
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[ 31.409720] testsuite-74.sh[560]: + wait 561
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[ 31.491757] systemd[1]: Created slice system-systemd\x2dcoredump.slice.
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[ 31.524488] systemd[1]: Started systemd-coredump@0-563-0.service.
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[ 31.616372] systemd-coredump[564]: [🡕] Process 561 (make-dump) of user 0 dumped core.
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Stack trace of thread 561:
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#0 0x00007ff86bb49af7 _Fork (libc.so.6 + 0xd4af7)
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#1 0x00007ff86bb4965f __libc_fork (libc.so.6 + 0xd465f)
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#2 0x000055e88011b0ad make_child (bash + 0x550ad)
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#3 0x000055e8800fd05f n/a (bash + 0x3705f)
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#4 0x000055e880100116 execute_command_internal (bash + 0x3a116)
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#5 0x000055e8801011f2 execute_command_internal (bash + 0x3b1f2)
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#6 0x000055e8801025b6 execute_command (bash + 0x3c5b6)
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#7 0x000055e8800f134b reader_loop (bash + 0x2b34b)
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#8 0x000055e8800e757d main (bash + 0x2157d)
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#9 0x00007ff86ba98850 n/a (libc.so.6 + 0x23850)
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#10 0x00007ff86ba9890a __libc_start_main (libc.so.6 + 0x2390a)
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#11 0x000055e8800e83b5 _start (bash + 0x223b5)
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ELF object binary architecture: AMD x86-64
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[ 31.666617] testsuite-74.sh[560]: /tmp/make-dump: line 12: 561 Trace/breakpoint trap (core dumped) "$bin" infinity
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...
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$ coredumpctl list --file system.journal
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TIME PID UID GID SIG COREFILE EXE SIZE
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Fri 2023-06-02 10:42:10 CEST 561 0 0 SIGTRAP journal /usr/bin/bash -
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Fri 2023-06-02 10:42:11 CEST 570 0 0 SIGABRT journal /tmp/test-dump -
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Fri 2023-06-02 10:42:12 CEST 582 0 0 SIGTRAP missing /tmp/test-dump -
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Fri 2023-06-02 10:42:13 CEST 593 0 0 SIGABRT missing /tmp/test-dump -
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(cherry picked from commit 1326d2dd059132760b40acb7a715ecc9ff08bd35)
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Related: RHEL-29430
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---
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test/units/testsuite-74.coredump.sh | 12 +++++++++++-
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1 file changed, 11 insertions(+), 1 deletion(-)
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diff --git a/test/units/testsuite-74.coredump.sh b/test/units/testsuite-74.coredump.sh
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index d5039b70f4..d30fd73717 100755
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--- a/test/units/testsuite-74.coredump.sh
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+++ b/test/units/testsuite-74.coredump.sh
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@@ -42,7 +42,17 @@ sig="${2:?}"
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ulimit -c unlimited
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"$bin" infinity &
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pid=$!
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-sleep 1
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+# Sync with the "fake" binary, so we kill it once it's fully forked off,
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+# otherwise we might kill it during fork and kernel would then report
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+# "wrong" binary name (i.e. $MAKE_DUMP_SCRIPT instead of $CORE_TEST_BIN).
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+# In this case, wait until the "fake" binary (sleep in this case) enters
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+# the "interruptible sleep" state, at which point it should be ready
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+# to be sacrificed.
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+for _ in {0..9}; do
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+ read -ra self_stat <"/proc/$pid/stat"
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+ [[ "${self_stat[2]}" == S ]] && break
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+ sleep .5
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+done
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kill -s "$sig" "$pid"
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# This should always fail
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! wait "$pid"
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