Whereas the buildds experience hangs during some tests, I see segfaults instead. This sometimes happens even before the first test has been run. This small Ruby testcase results in segfault 50% of the time under ruby1.8 1.8.7.358-2, but always succeeds with ruby1.9.1 1.9.3.0-2: > require 'thread' > Thread.new do > foo = "bar" > end (Measured out of 100 runs, on kfreebsd-i386 with 4-way SMP) Attached are outputs from ktrace for a success and from a failure; then I've tried to diff them. There seems to be a race whereby thread0 tries to call thr_kill on thread2, but if that happens too late thread2 will trigger a segfault instead. Regards, -- Steven Chamberlain steven@pyro.eu.org
--- ok.txt 2012-05-20 20:56:17.734917958 +0100 +++ fail.txt 2012-05-20 20:58:12.337235026 +0100 @@ -356,7 +356,7 @@ <thread0> ruby1.8 RET open 3 <thread0> ruby1.8 CALL read(0x3,0xbfbfe61c,0x4) <thread0> ruby1.8 GIO fd 3 read 4 bytes - 0x0000 f0be 5f81 |.._.| + 0x0000 d52b 6642 |.+fB| <thread0> ruby1.8 RET read 4 <thread0> ruby1.8 CALL close(0x3) @@ -411,7 +411,7 @@ <thread0> ruby1.8 CALL gettimeofday(0xbfbfe5b8,0) <thread0> ruby1.8 RET gettimeofday 0 <thread0> ruby1.8 CALL getpid -<thread0> ruby1.8 RET getpid 50320/0xc490 +<thread0> ruby1.8 RET getpid 50346/0xc4aa <thread0> ruby1.8 CALL break(0x808d000) <thread0> ruby1.8 RET break 0 <thread0> ruby1.8 CALL sigaction(SIGINT,0xbfbfe564,0xbfbfe5b8) @@ -750,65 +750,49 @@ <thread2> ruby1.8 RET sigprocmask 0 <thread2> ruby1.8 CALL clock_gettime(0,0x28b68eb8) <thread2> ruby1.8 RET clock_gettime 0 +<thread2> ruby1.8 CALL sigprocmask(SIG_SETMASK,0x28b68e90,0) +<thread2> ruby1.8 RET sigprocmask 0 +<thread2> ruby1.8 CALL clock_gettime(0,0x28b68f30) +<thread2> ruby1.8 RET clock_gettime 0 +<thread2> ruby1.8 CALL sigprocmask(SIG_BLOCK,0,0x28b68e80) +<thread2> ruby1.8 RET sigprocmask 0 +<thread0> ruby1.8 PSIG SIGSEGV caught handler=0x2818ba50 mask=0x80000000 code=0x1 +<thread2> ruby1.8 CALL sigprocmask(SIG_UNBLOCK,0x28b68ea0,0x28b68e90) +<thread2> ruby1.8 RET sigprocmask 0 +<thread0> ruby1.8 CALL write(0x2,0xbfbfbf9c,0xb) +<thread2> ruby1.8 CALL clock_gettime(0,0x28b68eb8) +<thread2> ruby1.8 RET clock_gettime 0 +<thread0> ruby1.8 GIO fd 2 wrote 11 bytes + "test.rb:4: " <thread2> ruby1.8 CALL nanosleep(0x28b68eb0,0) -<thread0> ruby1.8 CALL thr_kill(<thread2>,SIG(null)) -<thread0> ruby1.8 RET thr_kill 0 -<thread2> ruby1.8 RET nanosleep -1 errno 4 Interrupted system call -<thread0> ruby1.8 CALL sigprocmask(SIG_SETMASK,0,0xbfbfdc4c) -<thread2> ruby1.8 PSIG SIG(null) caught handler=0x28188860 mask=0x7ffefeff code=0x10001 +<thread0> ruby1.8 RET write 11/0xb +<thread2> ruby1.8 RET nanosleep -1 errno 22 Invalid argument +<thread0> ruby1.8 CALL write(0x2,0x2813751f,0x6) +<thread2> ruby1.8 CALL clock_gettime(0,0x28b68eb8) +<thread0> ruby1.8 GIO fd 2 wrote 6 bytes + "[BUG] " +<thread2> ruby1.8 RET clock_gettime 0 +<thread0> ruby1.8 RET write 6 +<thread2> ruby1.8 CALL nanosleep(0x28b68eb0,0) +<thread2> ruby1.8 RET nanosleep -1 errno 22 Invalid argument +<thread0> ruby1.8 CALL write(0x2,0xbfbf98a0,0x12) +<thread2> ruby1.8 CALL clock_gettime(0,0x28b68eb8) +<thread0> ruby1.8 GIO fd 2 wrote 18 bytes + "Segmentation fault" +<thread2> ruby1.8 RET clock_gettime 0 +<thread0> ruby1.8 RET write 18/0x12 +<thread2> ruby1.8 CALL nanosleep(0x28b68eb0,0) +<thread0> ruby1.8 CALL write(0x2,0xbfbf98a0,0x3d) +<thread0> ruby1.8 GIO fd 2 wrote 61 bytes + " +(2012-02-08 patchlevel 358) [i486-kfreebsd-gnu] + + " +<thread0> ruby1.8 RET write 61/0x3d +<thread0> ruby1.8 CALL sigprocmask(SIG_UNBLOCK,0xbfbfbf50,0) <thread0> ruby1.8 RET sigprocmask 0 -<thread2> ruby1.8 CALL sigprocmask(SIG_SETMASK,0x28b68e80,0) -<thread0> ruby1.8 CALL sigsuspend(0xbfbfdc4c) -<thread2> ruby1.8 RET sigprocmask 0 -<thread2> ruby1.8 CALL thr_kill(<thread0>,SIG(null)) -<thread2> ruby1.8 RET thr_kill 0 -<thread0> ruby1.8 PSIG SIG(null) caught handler=0x28188860 mask=0x80000000 code=0x10001 -<thread2> ruby1.8 CALL thr_kill(<thread1>,SIG(null)) -<thread0> ruby1.8 RET sigsuspend JUSTRETURN -<thread2> ruby1.8 RET thr_kill 0 -<thread0> ruby1.8 CALL sigreturn(0xbfbfd930) +<thread0> ruby1.8 CALL thr_kill(<thread0>,SIGIOT) +<thread0> ruby1.8 RET thr_kill 0 +<thread0> ruby1.8 PSIG SIGIOT SIG_DFL code=0x10001 <thread1> ruby1.8 RET poll -1 errno 4 Interrupted system call -<thread0> ruby1.8 RET sigreturn JUSTRETURN -<thread1> ruby1.8 PSIG SIG(null) caught handler=0x28188710 mask=0xfffefeef code=0x10001 -<thread2> ruby1.8 CALL thr_exit(0x807c1c0) -<thread0> ruby1.8 CALL write(0x4,0xbfbfdc8c,0x24) -<thread1> ruby1.8 CALL sigreturn(0x807a850) -<thread0> ruby1.8 GIO fd 4 wrote 36 bytes - 0x0000 a01a 3328 0100 0000 0204 0000 44a1 0e00 0060 0828 bc2a 1828 70fd 1628 d0d5 1728 e0dc bfbf |..3(........D....`.(.*.(p..(...(....| - -<thread1> ruby1.8 RET sigreturn JUSTRETURN -<thread0> ruby1.8 RET write 36/0x24 -<thread1> ruby1.8 CALL poll(0x807ac34,0x1,0x7d0) -<thread1> ruby1.8 RET poll 1 -<thread0> ruby1.8 CALL sigaction(SIGINT,0xbfbfe548,0xbfbfe59c) -<thread1> ruby1.8 CALL read(0x3,0x807ac00,0x24) -<thread0> ruby1.8 RET sigaction 0 -<thread1> ruby1.8 GIO fd 3 read 36 bytes - 0x0000 a01a 3328 0100 0000 0204 0000 44a1 0e00 0060 0828 bc2a 1828 70fd 1628 d0d5 1728 e0dc bfbf |..3(........D....`.(.*.(p..(...(....| - -<thread0> ruby1.8 CALL write(0x4,0xbfbfe5ec,0x24) -<thread1> ruby1.8 RET read 36/0x24 -<thread0> ruby1.8 GIO fd 4 wrote 36 bytes - 0x0000 a01a 3328 0200 0000 0000 0000 d85f 0628 0100 0000 0080 1a28 0500 0000 a0e5 bfbf 2800 0000 |..3(........._.(.......(........(...| - -<thread1> ruby1.8 CALL munmap(0x28369000,0x800000) -<thread0> ruby1.8 RET write 36/0x24 -<thread0> ruby1.8 CALL sigprocmask(SIG_SETMASK,0,0xbfbfe580) -<thread1> ruby1.8 RET munmap 0 -<thread0> ruby1.8 RET sigprocmask 0 -<thread1> ruby1.8 CALL poll(0x807ac34,0x1,0x7d0) -<thread0> ruby1.8 CALL sigsuspend(0xbfbfe580) -<thread1> ruby1.8 RET poll 1 -<thread1> ruby1.8 CALL read(0x3,0x807ac00,0x24) -<thread1> ruby1.8 GIO fd 3 read 36 bytes - 0x0000 a01a 3328 0200 0000 0000 0000 d85f 0628 0100 0000 0080 1a28 0500 0000 a0e5 bfbf 2800 0000 |..3(........._.(.......(........(...| - -<thread1> ruby1.8 RET read 36/0x24 -<thread1> ruby1.8 CALL thr_kill(<thread0>,SIG(null)) -<thread1> ruby1.8 RET thr_kill 0 -<thread0> ruby1.8 PSIG SIG(null) caught handler=0x28188860 mask=0x80000000 code=0x10001 -<thread1> ruby1.8 CALL thr_exit(0x807b6c0) -<thread0> ruby1.8 RET sigsuspend JUSTRETURN -<thread0> ruby1.8 CALL sigreturn(0xbfbfe260) -<thread0> ruby1.8 RET sigreturn JUSTRETURN -<thread0> ruby1.8 CALL exit(0) +<thread2> ruby1.8 RET nanosleep -1 errno 4 Interrupted system call
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ok.txt.gz
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