That might be a good solution, though what fd would we use? Can we safely open
an fd during a sighandler?
Frank
From: Malahal Naineni [mailto:mala...@gmail.com]
Sent: Wednesday, November 8, 2017 11:51 PM
To: d...@redhat.com
Cc: nfs-ganesha-devel@lists.sourceforge.net
Subject: Re: [Nfs-ganesha-devel] crash in jemalloc leading to a deadlock.
backtrace_symbols_fd() takes the same buffer and size arguments as
backtrace_symbols(), but instead of returning an array of strings to the
caller, it writes the strings, one per line, to the file descriptor fd.
backtrace_symbols_fd() does not call malloc(3), and so can be employed in
situations where the latter function might fail.
On Thu, Nov 9, 2017 at 12:24 AM, Daniel Gryniewicz <d...@redhat.com
<mailto:d...@redhat.com> > wrote:
Allocating in a backtrace seems like a very bad idea. If there's ever a crash
during an allocation, it is guaranteed to deadlock.
Daniel
On 11/08/2017 01:43 PM, Pradeep wrote:
I'm using Ganesha 2.6 dev.12 with jemalloc-3.6.0 and hitting a case
where jemalloc seem to be holding a lock and crashing. In Ganesha's
gsh_backtrace(), we try to allocate memory and that hangs (ended up in
deadlock). Have you seen this before? Perhaps it is a good idea not to
allocate memory in backtrace path?
#0 0x00007f49b51ff1bd in __lll_lock_wait () from /lib64/libpthread.so.0
#1 0x00007f49b51fad02 in _L_lock_791 () from /lib64/libpthread.so.0
#2 0x00007f49b51fac08 in pthread_mutex_lock () from /lib64/libpthread.so.0
#3 0x00007f49b65d12dc in arena_bin_malloc_hard () from /lib64/libjemalloc.so.1
#4 0x00007f49b65d1516 in je_arena_tcache_fill_small () from
/lib64/libjemalloc.so.1
#5 0x00007f49b65ea6ff in je_tcache_alloc_small_hard () from
/lib64/libjemalloc.so.1
#6 0x00007f49b65ca14f in malloc () from /lib64/libjemalloc.so.1
#7 0x00007f49b6c5a785 in _dl_scope_free () from /lib64/ld-linux-x86-64.so.2
#8 0x00007f49b6c55841 in _dl_map_object_deps () from /lib64/ld-linux-x86-64.so.2
#9 0x00007f49b6c5ba4b in dl_open_worker () from /lib64/ld-linux-x86-64.so.2
#10 0x00007f49b6c57364 in _dl_catch_error () from /lib64/ld-linux-x86-64.so.2
#11 0x00007f49b6c5b35b in _dl_open () from /lib64/ld-linux-x86-64.so.2
#12 0x00007f49b48f5ff2 in do_dlopen () from /lib64/libc.so.6
#13 0x00007f49b6c57364 in _dl_catch_error () from /lib64/ld-linux-x86-64.so.2
#14 0x00007f49b48f60b2 in __libc_dlopen_mode () from /lib64/libc.so.6
#15 0x00007f49b48cf595 in init () from /lib64/libc.so.6
#16 0x00007f49b51fdbb0 in pthread_once () from /lib64/libpthread.so.0
#17 0x00007f49b48cf6ac in backtrace () from /lib64/libc.so.6
#18 0x000000000045193d in gsh_backtrace () at
/usr/src/debug/nfs-ganesha-2.6-dev.12/MainNFSD/nfs_init.c:228
#19 0x00000000004519fe in crash_handler (signo=11,
info=0x7f49b155db70, ctx=0x7f49b155da40) at
/usr/src/debug/nfs-ganesha-2.6-dev.12/MainNFSD/nfs_init.c:244
#20 <signal handler called>
#21 0x00007f49b65d0c61 in arena_purge () from /lib64/libjemalloc.so.1
#22 0x00007f49b65d218d in je_arena_dalloc_large () from /lib64/libjemalloc.so.1
------------------------------------------------------------------------------
Check out the vibrant tech community on one of the world's most
engaging tech sites, Slashdot.org! http://sdm.link/slashdot
_______________________________________________
Nfs-ganesha-devel mailing list
Nfs-ganesha-devel@lists.sourceforge.net
<mailto:Nfs-ganesha-devel@lists.sourceforge.net>
https://lists.sourceforge.net/lists/listinfo/nfs-ganesha-devel
------------------------------------------------------------------------------
Check out the vibrant tech community on one of the world's most
engaging tech sites, Slashdot.org! http://sdm.link/slashdot
_______________________________________________
Nfs-ganesha-devel mailing list
Nfs-ganesha-devel@lists.sourceforge.net
<mailto:Nfs-ganesha-devel@lists.sourceforge.net>
https://lists.sourceforge.net/lists/listinfo/nfs-ganesha-devel
---
This email has been checked for viruses by Avast antivirus software.
https://www.avast.com/antivirus
------------------------------------------------------------------------------
Check out the vibrant tech community on one of the world's most
engaging tech sites, Slashdot.org! http://sdm.link/slashdot
_______________________________________________
Nfs-ganesha-devel mailing list
Nfs-ganesha-devel@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/nfs-ganesha-devel
