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 ste...@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
ok.txt.gz
Description: application/gzip
fail.txt.gz
Description: application/gzip
