[Clamav-devel] ClamAV SegFault on Reload

Michael D. clamavdev at cosis.dk
Mon Jul 3 06:50:13 EDT 2017


I've been running the Development Version of ClamAV for a while, and the 
only problem I've encountered is that sometimes when it's instructed to 
reload the databases (clamscan --reload) it SegFaults:

Jun 18 15:25:04 Boomer kernel: clamd[3414]: segfault at 1de2 ip 00007f618669d345 sp 00007ffe57c51d28 error 4 in libclamav.so.7.1.1[7f61865e0000+1b7000]
Jun 19 01:44:17 Boomer kernel: clamd[3423]: segfault at 15f0d1 ip 00007f30e1010345 sp 00007ffdb449ccb8 error 4 in libclamav.so.7.1.1[7f30e0f53000+1b7000]
Jun 30 22:41:08 Boomer kernel: clamd[3723]: segfault at 748334 ip 00007f16a9c04066 sp 00007ffc68399d80 error 4 in libclamav.so.7.1.1[7f16a9bca000+1cf000]

To get more information I installed gdb, and ran it like this:

root at Boomer [ ~ ]# gdb /usr/sbin/clamd
gdb) run --debug -c /etc/clamav/clamd.conf
Starting program: /usr/sbin/clamd --debug -c /etc/clamav/clamd.conf
warning: Unable to find libthread_db matching inferior's thread library, thread debugging will not be available.
LibClamAV debug: Initialized devel-clamav-0.99-beta1-683-g5a0b148b4 engine
LibClamAV debug: Initializing phishcheck module

After a while I got this: (Along with a Core Dump)

$Received POLLIN|POLLHUP on fd 7
$fds_poll_recv: timeout after 5 seconds
$Received POLLIN|POLLHUP on fd 11
$got command RELOAD (7, 2), argument:
$Receive thread: closing conn (FD 11), group finished
$Consumed entire command

Thread 1 "clamd" received signal SIGSEGV, Segmentation fault.
mpool_free (mp=0x7ffff7fa6000, ptr=0x100000000) at mpool.c:698
698	  f = allocbase_fromfrag(f);
(gdb) bt
#0  mpool_free (mp=0x7ffff7fa6000, ptr=0x100000000) at mpool.c:698
#1  0x00007ffff7a2c038 in hm_free (root=root at entry=0x7ffff5289168) at matcher-hash.c:315
#2  0x00007ffff7a3d242 in cl_engine_free (engine=engine at entry=0x6b9b40) at readdb.c:4989
#3  0x000000000040e65d in reload_db (ret=<synthetic pointer>, do_check=0, opts=0x62e010, dboptions=8202, engine=0x6b9b40) at server-th.c:197
#4  recvloop_th (socketds=0x6bbdc0, nsockets=2, engine=0x6b9b40, dboptions=dboptions at entry=8202, opts=0x62e010) at server-th.c:1502
#5  0x0000000000405aaa in main (argc=<optimized out>, argv=<optimized out>) at clamd.c:800

Can you use this information for anything?

Any other commands I could run to gather more info?

Best Regards


System Info:

Dist: LFS-8.0 64-Bit
Kernel: 4.11.7
ClamAV devel-clamav-0.99-beta1-683-g5a0b148b4/23529

root at Boomer [ ~ ]# ldd /usr/sbin/clamd
	linux-vdso.so.1 (0x00007fff6d116000)
	libclamav.so.7 => /usr/lib/libclamav.so.7 (0x00007f5ed4f1c000)
	libxml2.so.2 => /usr/lib/libxml2.so.2 (0x00007f5ed4bb7000)
	liblzma.so.5 => /lib/liblzma.so.5 (0x00007f5ed4991000)
	libbz2.so.1.0 => /lib/libbz2.so.1.0 (0x00007f5ed4781000)
	libltdl.so.7 => /usr/lib/libltdl.so.7 (0x00007f5ed4577000)
	libdl.so.2 => /lib/libdl.so.2 (0x00007f5ed4373000)
	libssl.so.1.0.0 => /usr/lib/libssl.so.1.0.0 (0x00007f5ed4100000)
	libcrypto.so.1.0.0 => /usr/lib/libcrypto.so.1.0.0 (0x00007f5ed3cab000)
	libz.so.1 => /lib/libz.so.1 (0x00007f5ed3a8f000)
	libpcre2-8.so.0 => /usr/lib/libpcre2-8.so.0 (0x00007f5ed3843000)
	libm.so.6 => /lib/libm.so.6 (0x00007f5ed3530000)
	libpthread.so.0 => /lib/libpthread.so.0 (0x00007f5ed3312000)
	libc.so.6 => /lib/libc.so.6 (0x00007f5ed2f6e000)
	/lib64/ld-linux-x86-64.so.2 (0x00007f5ed5304000)
root at Boomer [ ~ ]#

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