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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