[Stgt-devel] disk kicked out of RAID -> tgtd segmentation fault

[Mark Harvey]

My 2c worth.

Try running the tgtd in 'foreground' mode (after setting "ulimit -c
unlimited").

You will then get a core file which should be a little easier to work
with (vs gdb on a running tgtd instance).
e.g.

Start up a shell.
# ulimit -c unlimited
# tgtd -f -d 1

Cheers
Mark


-----Original Message-----
From: stgt-devel-bounces at lists.berlios.de
[mailto:stgt-devel-bounces at lists.berlios.de] On Behalf Of Tomasz
Chmielewski
Sent: Friday, June 27, 2008 8:11 PM
To: ronnie sahlberg
Cc: FUJITA Tomonori; stgt-devel at lists.berlios.de
Subject: Re: [Stgt-devel] disk kicked out of RAID -> tgtd segmentation
fault

ronnie sahlberg schrieb:
> Since it is reproducible,  can you run it under gdb and get a
backtrace?

I'm not sure what is the correct approach to debug tgtd in gdb.

But simply running a debugger against tgtd (with an initiator connected)

can make it segfault:

(gdb) attach 9348
Attaching to process 9348
Reading symbols from /usr/sbin/tgtd...done.
Using host libthread_db library "/lib/tls/libthread_db.so.1".
Reading symbols from /usr/lib/i686/cmov/libcrypto.so.0.9.8...done.
Loaded symbols for /usr/lib/i686/cmov/libcrypto.so.0.9.8
Reading symbols from /lib/tls/libpthread.so.0...done.
[Thread debugging using libthread_db enabled]
[New Thread 1875564768 (LWP 9348)]
[New Thread 1758104496 (LWP 9378)]
[New Thread 1766493104 (LWP 9377)]
[New Thread 1774881712 (LWP 9376)]
[New Thread 1783270320 (LWP 9375)]
[New Thread 1791658928 (LWP 9374)]
[New Thread 1800047536 (LWP 9370)]
[New Thread 1808436144 (LWP 9369)]
[New Thread 1816824752 (LWP 9368)]
[New Thread 1825213360 (LWP 9367)]
[New Thread 1833601968 (LWP 9366)]
[New Thread 1841990576 (LWP 9359)]
[New Thread 1850379184 (LWP 9358)]
[New Thread 1858767792 (LWP 9357)]
[New Thread 1867156400 (LWP 9356)]
[New Thread 1875545008 (LWP 9355)]
Loaded symbols for /lib/tls/libpthread.so.0
Reading symbols from /lib/tls/libc.so.6...done.
Loaded symbols for /lib/tls/libc.so.6
Reading symbols from /lib/tls/libdl.so.2...done.
Loaded symbols for /lib/tls/libdl.so.2
Reading symbols from /usr/lib/libz.so.1...done.
Loaded symbols for /usr/lib/libz.so.1
Reading symbols from /lib/ld-linux.so.2...done.
Loaded symbols for /lib/ld-linux.so.2
0x6fd92679 in epoll_wait () from /lib/tls/libc.so.6
(gdb) cont
Continuing.

Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread 1875564768 (LWP 9348)]
__cmd_done (target=0x0, cmd=0x9ee9748) at target.c:864
864             err = target->bst->bs_cmd_done(cmd);



-- 
Tomasz Chmielewski
http://wpkg.org
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