[Q] Strange hang in jemalloc

[Taehwan Weon]

Hi,

I am using jemalloc-3.4.0 on Centos 6.3
When my SEGV signal handler tried to dump call stacks, hang occurred as
following.
I don't know why libc's fork called jemalloc_prefork even if I didn't set
LD_PRELOAD.



#0  0x000000351d60d654 in __lll_lock_wait () from /lib64/libpthread.so.0
#1  0x000000351d608f4a in _L_lock_1034 () from /lib64/libpthread.so.0
#2  0x000000351d608e0c in pthread_mutex_lock () from /lib64/libpthread.so.0
#3  0x00002b59a8055d6d in malloc_mutex_lock (mutex=0x2b59a84a4320) at
include/jemalloc/internal/mutex.h:77
#4  malloc_mutex_prefork (mutex=0x2b59a84a4320) at src/mutex.c:109
#5  0x00002b59a8044c32 in arena_prefork (arena=0x2b59a84a3d40) at
src/arena.c:2344
#6  0x00002b59a803f555 in jemalloc_prefork () at src/jemalloc.c:1760
#7  0x000000351ca9a2a6 in fork () from /lib64/libc.so.6
#8  0x000000351ca6200d in _IO_proc_open@@GLIBC_2.2.5 () from
/lib64/libc.so.6
#9  0x000000351ca62269 in popen@@GLIBC_2.2.5 () from /lib64/libc.so.6
#10 0x00002b59a71bc1f9 in backtrace_lineinfo (number=1, address=<value
optimized out>, symbol=0x2b61f4000918 "/usr/lib64/libnc.so.2
[0x2b59a71bc3b1]") at cfs_apix.c:363
#11 0x00002b59a71bc3ff in nc_dump_stack (sig=<value optimized out>) at
cfs_apix.c:423
#12 <signal handler called>
#13 0x00002b59a8047332 in arena_dalloc_bin_locked (arena=0x2b59a84a3d40,
chunk=0x2b61ef000000, ptr=<value optimized out>, mapelm=<value optimized
out>) at src/arena.c:1717
#14 0x00002b59a805fba4 in tcache_bin_flush_small (tbin=0x2b61ef107128,
binind=8, rem=9, tcache=0x2b61ef107000) at src/tcache.c:127
#15 0x00002b59a805fcd4 in tcache_event_hard (tcache=0x80) at src/tcache.c:39
#16 0x00002b59a80428d9 in tcache_event (ptr=0x2b61efd26dc0) at
include/jemalloc/internal/tcache.h:271
#17 tcache_dalloc_small (ptr=0x2b61efd26dc0) at
include/jemalloc/internal/tcache.h:408
#18 arena_dalloc (ptr=0x2b61efd26dc0) at
include/jemalloc/internal/arena.h:1003
#19 idallocx (ptr=0x2b61efd26dc0) at
include/jemalloc/internal/jemalloc_internal.h:913
#20 iqallocx (ptr=0x2b61efd26dc0) at
include/jemalloc/internal/jemalloc_internal.h:932
#21 iqalloc (ptr=0x2b61efd26dc0) at
include/jemalloc/internal/jemalloc_internal.h:939
#22 jefree (ptr=0x2b61efd26dc0) at src/jemalloc.c:1272
#23 0x00002b59a71c958b in __nc_free (p=0x2b61efd26dd0, file=<value
optimized out>, lno=<value optimized out>) at util.c:1916
#24 0x00002b59a71cb975 in tlcq_dequeue (q=0x2b59a9ee3210, msec=<value
optimized out>) at tlc_queue.c:215
#25 0x00002b59a71c154b in tp_worker (d=<value optimized out>) at
threadpool.c:116
#26 0x000000351d60683d in start_thread () from /lib64/libpthread.so.0
#27 0x000000351cad503d in clone () from /lib64/libc.so.6


Any hint will be highly appreciated.

----------
weon
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