[New-bugs-announce] [issue23680] Sporadic freeze in test_interrupted_write_retry_text

[Antoine Pitrou]

New submission from Antoine Pitrou:

Sometimes the test suite freezes in test_interrupted_write_retry_text (test.test_io.CSignalsTest). Corresponding strace is:


write(1, "test_interrupted_write_retry_tex"..., 66) = 66
rt_sigaction(SIGALRM, {0x444400, [], SA_RESTORER, 0x7fd1ada2d0a0}, {SIG_DFL, [], SA_RESTORER, 0x7fd1ada2d0a0}, 8) = 0
pipe2([4, 5], O_CLOEXEC)                = 0
rt_sigaction(SIGALRM, {0x444400, [], SA_RESTORER, 0x7fd1ada2d0a0}, {0x444400, [], SA_RESTORER, 0x7fd1ada2d0a0}, 8) = 0
fstat(5, {st_mode=S_IFIFO|0600, st_size=0, ...}) = 0
fstat(5, {st_mode=S_IFIFO|0600, st_size=0, ...}) = 0
ioctl(5, SNDCTL_TMR_TIMEBASE or TCGETS, 0x7fffd0944d40) = -1 EINVAL (Invalid argument)
lseek(5, 0, SEEK_CUR)                   = -1 ESPIPE (Illegal seek)
lseek(5, 0, SEEK_CUR)                   = -1 ESPIPE (Illegal seek)
alarm(1)                                = 0
brk(0x3360000)                          = 0x3360000
--- SIGALRM (Alarm clock) @ 0 (0) ---
rt_sigreturn(0x2640030)                 = 53870592
write(5, "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx"..., 4194305


A successful run looks like this:

write(1, "test_interrupted_write_retry_tex"..., 66) = 66
rt_sigaction(SIGALRM, {0x444400, [], SA_RESTORER, 0x7fd1ada2d0a0}, {SIG_DFL, [], SA_RESTORER, 0x7fd1ada2d0a0}, 8) = 0
pipe2([4, 5], O_CLOEXEC)                = 0
rt_sigaction(SIGALRM, {0x444400, [], SA_RESTORER, 0x7fd1ada2d0a0}, {0x444400, [], SA_RESTORER, 0x7fd1ada2d0a0}, 8) = 0
fstat(5, {st_mode=S_IFIFO|0600, st_size=0, ...}) = 0
fstat(5, {st_mode=S_IFIFO|0600, st_size=0, ...}) = 0
ioctl(5, SNDCTL_TMR_TIMEBASE or TCGETS, 0x7fffd0944d40) = -1 EINVAL (Invalid argument)
lseek(5, 0, SEEK_CUR)                   = -1 ESPIPE (Illegal seek)
lseek(5, 0, SEEK_CUR)                   = -1 ESPIPE (Illegal seek)
alarm(1)                                = 0
brk(0x2f60000)                          = 0x2f60000
brk(0x3360000)                          = 0x3360000
write(5, "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx"..., 4194305) = 65536
--- SIGALRM (Alarm clock) @ 0 (0) ---
rt_sigreturn(0x2640030)                 = 65536
rt_sigaction(SIGALRM, {0x444400, [], SA_RESTORER, 0x7fd1ada2d0a0}, {0x444400, [], SA_RESTORER, 0x7fd1ada2d0a0}, 8) = 0
alarm(1)                                = 0
write(5, "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx"..., 4128769) = ? ERESTARTSYS (To be restarted)
--- SIGALRM (Alarm clock) @ 0 (0) ---
rt_sigreturn(0x2640030)                 = -1 EINTR (Interrupted system call)
clone(child_stack=0x7fd1a8852ff0, flags=CLONE_VM|CLONE_FS|CLONE_FILES|CLONE_SIGHAND|CLONE_THREAD|CLONE_SYSVSEM|CLONE_SETTLS|CLONE_PARENT_SE
TTID|CLONE_CHILD_CLEARTID, parent_tidptr=0x7fd1a88539d0, tls=0x7fd1a8853700, child_tidptr=0x7fd1a88539d0) = 3611
futex(0x24b5140, FUTEX_WAIT_PRIVATE, 0, NULL) = 0
futex(0x9a1904, FUTEX_WAIT_BITSET_PRIVATE|FUTEX_CLOCK_REALTIME, 1563, {1426520501, 20155000}, ffffffff) = 0
futex(0x9a1940, FUTEX_WAIT_PRIVATE, 2, NULL) = 0
futex(0x9a1940, FUTEX_WAKE_PRIVATE, 1)  = 0
write(5, "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx"..., 4128769) = 4128769
futex(0x9a1904, FUTEX_WAKE_OP_PRIVATE, 1, 1, 0x9a1900, {FUTEX_OP_SET, 0, FUTEX_OP_CMP_GT, 1}) = 1
futex(0x9a1940, FUTEX_WAKE_PRIVATE, 1)  = 1
futex(0x2631c50, FUTEX_WAIT_PRIVATE, 0, NULL) = 0
close(5)                                = 0
close(4)                                = 0
rt_sigaction(SIGALRM, {SIG_DFL, [], SA_RESTORER, 0x7fd1ada2d0a0}, {0x444400, [], SA_RESTORER, 0x7fd1ada2d0a0}, 8) = 0
write(1, "ok\n", 3)                     = 3

----------
messages: 238215
nosy: haypo, neologix, pitrou
priority: normal
severity: normal
status: open
title: Sporadic freeze in test_interrupted_write_retry_text
versions: Python 3.5

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue23680>
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