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2423b6c04e
I got kms_flip in hung state with the backtrace below, while the parent process waiting for the signal helper to exit. It was quite easy to reproduce the bug by running kms_flip --run-subtest=flip-vs-dpms-off-vs-modeset With the change I couldn't reproduce it. TODO: audit/fix other signal handlers with signal-unsafe functions 0 0x00007f9a1362018b in ?? () from /lib/x86_64-linux-gnu/libc.so.6 1 0x00007f9a1359df81 in ?? () from /lib/x86_64-linux-gnu/libc.so.6 2 0x00007f9a1359b6cf in ?? () from /lib/x86_64-linux-gnu/libc.so.6 3 0x00007f9a13628eb6 in __vasprintf_chk () from /lib/x86_64-linux-gnu/libc.so.6 4 0x00007f9a13628e72 in __asprintf_chk () from /lib/x86_64-linux-gnu/libc.so.6 5 0x000000000040a4a2 in asprintf (__fmt=0x417441 "/dev/dri/card%u", __ptr=0x7fff1a972c08) at /usr/include/x86_64-linux-gnu/bits/stdio2.h:178 6 drm_get_card () at drmtest.c:190 7 0x000000000040a54a in __drm_open_any () at drmtest.c:229 8 0x000000000040a846 in quiescent_gpu_at_exit (sig=<optimized out>) at drmtest.c:281 9 0x0000000000408759 in call_exit_handlers (sig=3) at drmtest.c:1519 10 fatal_sig_handler (sig=3) at drmtest.c:1543 11 <signal handler called> 12 0x00007f9a13596770 in ?? () from /lib/x86_64-linux-gnu/libc.so.6 13 0x00007f9a135d8f3f in fork () from /lib/x86_64-linux-gnu/libc.so.6 14 0x000000000040b3af in __igt_fork_helper (proc=0x61d8cc <signal_helper>) at drmtest.c:1199 15 0x000000000040b4ce in igt_fork_signal_helper () at drmtest.c:751 16 0x0000000000404167 in main (argc=<optimized out>, argv=<optimized out>) at kms_flip.c:1533 v2: - can't use snprintf as that's also signal-unsafe, so just use a dup'ed fd (Chris,Daniel) Signed-off-by: Imre Deak <imre.deak@intel.com>