RHEL6 init.d script (was Re: Initscript Debian Wheezy)

[Jeremy Allison]

On Thu, Sep 06, 2012 at 11:55:23AM -0700, David Rivera wrote:
> Hi,
> 
> I'm having the exact same problem. I've been getting the following panic
> running samba 4 with s3fs. The system is Ubuntu Linux 11.10 x86-64 running
> samba version 4.0.0beta9-GIT-a3b67e5. Backtrace using panic action = /path/to/
> gdb_backtrace %d in smb.conf returned nothing in the logs and I wasn't able to
> run samba under gdb as I needed the file server to be functional asap. I did,
> however, run gdb_backtrace manually with the pid of one of the smbd process
> which did panic. gdb_backtrace output is here http://pastebin.com/Kjymcckg .
> 
> This was in log.smbd: 
> 
> [2012/09/04 14:41:07.217180,  0] ../source3/lib/popt_common.c:67
> (popt_s3_talloc_log_fn)
>   Bad talloc magic value - access after free
> [2012/09/04 14:41:07.217279,  0] ../source3/lib/util.c:810(smb_panic_s3)
>   PANIC (pid 17355): Bad talloc magic value - access after free
> [2012/09/04 14:41:07.218110,  0] ../source3/lib/util.c:921(log_stack_trace)
>   BACKTRACE: 37 stack frames:
>    #0 /usr/local/samba/lib/libsmbconf.so.0(log_stack_trace+0x1f)
> [0x7f31e5adca71]
>    #1 /usr/local/samba/lib/libsmbconf.so.0(smb_panic_s3+0x6e) [0x7f31e5adc8bf]
>    #2 /usr/local/samba/lib/libsamba-util.so.0(smb_panic+0x28) [0x7f31e791d0ca]
>    #3 /usr/local/samba/lib/private/libtalloc.so.2(+0x1f7f) [0x7f31e6d7df7f]
>    #4 /usr/local/samba/lib/private/libtalloc.so.2(+0x1ffb) [0x7f31e6d7dffb]
>    #5 /usr/local/samba/lib/private/libtalloc.so.2(+0x2078) [0x7f31e6d7e078]
>    #6 /usr/local/samba/lib/private/libtalloc.so.2(_talloc_free+0x36)
> [0x7f31e6d7ff2d]
>    #7 /usr/local/samba/lib/private/libsmbd_base.so(+0x16a7f2) [0x7f31e70ef7f2]
>    #8 /usr/local/samba/lib/private/libtalloc.so.2(+0x2ba9) [0x7f31e6d7eba9]
>    #9 /usr/local/samba/lib/private/libtalloc.so.2(+0x3c00) [0x7f31e6d7fc00]
>    #10 /usr/local/samba/lib/private/libtalloc.so.2(+0x2d4c) [0x7f31e6d7ed4c]
>    #11 /usr/local/samba/lib/private/libtalloc.so.2(+0x3c00) [0x7f31e6d7fc00]
>    #12 /usr/local/samba/lib/private/libtalloc.so.2(+0x2d4c) [0x7f31e6d7ed4c]
>    #13 /usr/local/samba/lib/private/libtalloc.so.2(+0x3c00) [0x7f31e6d7fc00]
>    #14 /usr/local/samba/lib/private/libtalloc.so.2(+0x2d4c) [0x7f31e6d7ed4c]
>    #15 /usr/local/samba/lib/private/libtalloc.so.2(+0x3c00) [0x7f31e6d7fc00]
>    #16 /usr/local/samba/lib/private/libtalloc.so.2(+0x2d4c) [0x7f31e6d7ed4c]
>    #17 /usr/local/samba/lib/private/libtalloc.so.2(_talloc_free+0x102)
> [0x7f31e6d7fff9]
>    #18 /usr/local/samba/lib/private/libsmbd_base.so(+0x18b019) [0x7f31e7110019]
>    #19 /usr/local/samba/lib/private/libsmbd_base.so(+0x18b24c) [0x7f31e711024c]
>    #20 /usr/local/samba/sbin/smbd() [0x40823b]
>    #21 /usr/local/samba/lib/libsmbconf.so.0(messaging_dispatch_rec+0x83)
> [0x7f31e5ae5dc1]
>    #22 /usr/local/samba/lib/libsmbconf.so.0(+0x2d259) [0x7f31e5ae7259]
>    #23 /usr/local/samba/lib/libsmbconf.so.0(+0x2be87) [0x7f31e5ae5e87]
>    #24 /usr/local/samba/lib/private/libtevent.so.0
> (tevent_common_check_signal+0x213) [0x7f31e5d4c2ff]
>    #25 /usr/local/samba/lib/libsmbconf.so.0(run_events_poll+0x2f)
> [0x7f31e5af9ad8]
>    #26 /usr/local/samba/lib/libsmbconf.so.0(+0x4037b) [0x7f31e5afa37b]
>    #27 /usr/local/samba/lib/private/libtevent.so.0(_tevent_loop_once+0xe4)
> [0x7f31e5d47f0a]
>    #28 /usr/local/samba/lib/private/libsmbd_base.so(smbd_process+0x1309)
> [0x7f31e70d1b80]
>    #29 /usr/local/samba/sbin/smbd() [0x409570]
>    #30 /usr/local/samba/lib/libsmbconf.so.0(run_events_poll+0x716)
> [0x7f31e5afa1bf]
>    #31 /usr/local/samba/lib/libsmbconf.so.0(+0x40456) [0x7f31e5afa456]
>    #32 /usr/local/samba/lib/private/libtevent.so.0(_tevent_loop_once+0xe4)
> [0x7f31e5d47f0a]
>    #33 /usr/local/samba/sbin/smbd() [0x40a1b7]
>    #34 /usr/local/samba/sbin/smbd(main+0x1567) [0x40b870]
>    #35 /lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xed) [0x7f31e437d30d]
>    #36 /usr/local/samba/sbin/smbd() [0x4052a9]
> [2012/09/04 14:41:07.219719,  0] ../source3/lib/util.c:822(smb_panic_s3)
>   smb_panic(): calling panic action [/bin/sleep 999999999]
> 
> Let me know if anything else is needed and thanks for your help in advance.

What's in log.smbd doesn't show any symbols. What we need is for you to
attach to the parent of the /bin/sleep process with gdb and get a backtrace
giving line numbers. You can do this whilst other smbd processes are still
active, so it won't break your file server.

Jeremy.