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Diffstat (limited to 'results/classifier/user-mode-bugs/957')
| -rw-r--r-- | results/classifier/user-mode-bugs/957 | 73 |
1 files changed, 73 insertions, 0 deletions
diff --git a/results/classifier/user-mode-bugs/957 b/results/classifier/user-mode-bugs/957 new file mode 100644 index 000000000..6d9bbf842 --- /dev/null +++ b/results/classifier/user-mode-bugs/957 @@ -0,0 +1,73 @@ + + +qemu-m68k: python runtime failures, "The futex facility returned an unexpected error code." +Description of problem: +The python interpreter (both Python 3.9 and Python 3.10) crashes during a rebuild of Python itself (fairly reproducible but not always at the same point of the build; using MAKEOPTS=-j1 or running under high system load decreases the probability, as does using the qemu -systrace switch). The output is +``` +The futex facility returned an unexpected error code. +``` + +Digging into glibc sources, this error together with an abort occurs when the return value of a futex call is not in a short list of allowed values, see ``nptl/futex-internal.c`` and ``sysdeps/nptl/futex-internal.h``. + +Running qemu with QEMU_STRACE=1 decreases the probability of the error greatly, but after some attempts I was able to get a log. Several threads seem to write at the same time, leading to rather garbled output, but my interpretation is an error value of "Invalid argument". + + +``` +116876 get_thread_area(0x00000001) = 989882672 +116876 116876 get_thread_area(0x00000001)get_thread_area(0x00000018) = 989882672 + = 1065219744 +116876 get_thread_area(0x00000000) = 1065219744 +116876 futex(0x3f5003fa,FUTEX_PRIVATE_FLAG|FUTEX_WAIT116876 ,2,116876 NULL,0x3fffda10,get_thread_area(0xffffffff) = 1065219744 +futex(0x3f5003fa,1073732112)FUTEX_PRIVATE_FLAG|FUTEX_WAIT = ,2,NULL,-1 errno=22 (Invalid argument)116876 get_thread_area(0x00000000) + = 1065219744 +0x3fffda10,116876 get_thread_area(0x00000000)1073732112 = )1065219744 +116876 futex(0x3f7d4c34,FUTEX_PRIVATE_FLAG|FUTEX_WAKE,1,NULL,NULL, = 0)-1 errno=22 (Invalid argument) + = 0 + = 116876 get_thread_area(0x3f7d4c34)1 = +116876 get_thread_area(0x00000000) = 1065219744 +926968112 +116876 get_thread_area(0x00000016) = 926968112 +116876 get_thread_area(0x00000000) = 1065219744 +116876 get_thread_area(0x00000000) = 1065219744 +116876 get_thread_area(0x00000001)116876 = futex(116876 0x3f5003fa,get_thread_area(0x00000000)FUTEX_PRIVATE_FLAG| = 926968112 +116876 get_thread_area(0x00000000) = 926968112FUTEX_WAKE +,1,116876 NULL,0x3fffda10,get_thread_area(0x00000000) = 926968112 +1065219744 +116876 get_thread_area(0x00000001)116876 = 1065219744 +1073732112) = 116876 -1 errno=22 (Invalid argument) +futex(0x3ba005fc,FUTEX_PRIVATE_FLAG|FUTEX_CLOCK_REALTIME|FUTEX_WAIT_BITSET,0,NULL,NULL,get_thread_area(0x00000000)0 = 926968112) +116876 get_thread_area(0x00000000) = 926968112 +116876 futex(0x3f7d4c38,FUTEX_PRIVATE_FLAG|FUTEX_WAKE,1,NULL,0x40007bf8,1073773560) = 0 +116876 futex(0x40053a8c,FUTEX_PRIVATE_FLAG|FUTEX_WAKE,1,NULL,NULL,0) = 1 + = 0 +116876 get_thread_area(0x40053a8c) = 885025072 +116876 get_thread_area(0x00000001) = 885025072 +116876 get_thread_area(0x00b4b456) = 885025072 +116876 get_thread_area(0x00000000) = 885025072 +116876 get_thread_area(0x00000000) = 885025072 +116876 Unknown syscall 403 +116876 get_thread_area(0x00000000) = 885025072 +116876 get_thread_area(0x00003baa) = 885025072 +116876 get_thread_area(0x00003b01) = 885025072 +116876 get_thread_area(0x00003b01) = 885025072 +116876 116876 futex(get_thread_area(0x00b4b456)0x3f7d4c30,FUTEX_PRIVATE_FLAG|FUTEX_WAIT_BITSET,0,0x34bfe62c,NULL,0) = 926968112 +116876 get_thread_area(0x00000018) = 926968112 +116876 get_thread_area(0x3ed5b9c8) = 926968112 +116876 get_thread_area(0x00000000) = 926968112 +116876 get_thread_area(0x00000000) = 926968112 +116876 get_thread_area(0x00000000) = 926968112 +116876 get_thread_area(0x00000000) = 926968112 +116876 get_thread_area(0x00000000) = 926968112 +116876 futex(0x3f7d4c30,FUTEX_PRIVATE_FLAG|FUTEX_WAKE,1,NULL,NULL,0) = 1 +116876 get_thread_area(0x00000000) = 926968112 +116876 get_thread_area(0x00000001) = 926968112 +116876 get_thread_area(0x0000000f) = 926968112116876 = 0 + +116876 get_thread_area(0x00000001) = 926968112 +116876 get_thread_area(0x00000001) = 926968112 +116876 get_thread_area(0x00000001)writev(2,0x3affed88,0x1) = 926968112 +The futex facility returned an unexpected error code. +116876 get_thread_area(0x3f7d4c30) = 885025072 +``` + +Advice on how to do further debuggging is appreciated. |