samba 3.3.1 built with http://cvs.pld-linux.org/cgi-bin/cvsweb.cgi/~checkout~/SPECS/samba.spec?rev=1.435;content-type=text%2Fplain recipe fails when avahi is enabled (--enable-dnssd): [2009/03/09 18:49:04, 0] lib/fault.c:fault_report(40) =============================================================== [2009/03/09 18:49:04, 0] lib/fault.c:fault_report(41) INTERNAL ERROR: Signal 6 in pid 21631 (3.3.1) Please read the Trouble-Shooting section of the Samba3-HOWTO [2009/03/09 18:49:04, 0] lib/fault.c:fault_report(43) From: http://www.samba.org/samba/docs/Samba3-HOWTO.pdf [2009/03/09 18:49:04, 0] lib/fault.c:fault_report(44) =============================================================== [2009/03/09 18:49:04, 0] lib/util.c:smb_panic(1673) PANIC (pid 21631): internal error [2009/03/09 18:49:04, 0] lib/util.c:log_stack_trace(1777) BACKTRACE: 9 stack frames: #0 /usr/sbin/smbd(log_stack_trace+0x2d) [0xb7bd9ca5] #1 /usr/sbin/smbd(smb_panic+0x7c) [0xb7bd9dfe] #2 /usr/sbin/smbd [0xb7bc497b] #3 [0xb78f2400] #4 /usr/lib/libtalloc.so.1(talloc_free+0x50) [0xb76eaf25] #5 /usr/sbin/smbd(dns_register_close+0x4f) [0xb7a071d9] #6 /usr/sbin/smbd [0xb7e41036] #7 /usr/sbin/smbd(main+0xb87) [0xb7e41ddc] #8 /lib/libc.so.6(__libc_start_main+0xee) [0xb75a16ee] [2009/03/09 18:49:04, 0] lib/fault.c:dump_core(218) Can not dump core: corepath not set up it happens even if samba is just running and no one connects to it. I start smbd wait few minutes/hours (usually minutes) and smbd dies. Disabling dnssd fixes the problem it seems (other users of this PLD package confirm this).
Tested with avahi 0.6.23 and 0.6.24 - segfaults with both.
Can you try http://git.samba.org/?p=samba.git;a=commitdiff;h=4624451b7b7869 ? Fixed a segfault in that code yesterday. Thanks, Volker
Patch seems to fix the issue.
Or not, got reports from users using smbd with #2 patch applied. Mar 11 09:51:19 pingwin smbd[13583]: [2009/03/11 09:51:19, 0] lib/fault.c:fault_report(40) Mar 11 09:51:19 pingwin smbd[13583]: =============================================================== Mar 11 09:51:19 pingwin smbd[13583]: [2009/03/11 09:51:19, 0] lib/fault.c:fault_report(41) Mar 11 09:51:19 pingwin smbd[13583]: INTERNAL ERROR: Signal 6 in pid 13583 (3.3.1) Mar 11 09:51:19 pingwin smbd[13583]: Please read the Trouble-Shooting section of the Samba3-HOWTO Mar 11 09:51:19 pingwin smbd[13583]: [2009/03/11 09:51:19, 0] lib/fault.c:fault_report(43) Mar 11 09:51:19 pingwin smbd[13583]: Mar 11 09:51:19 pingwin smbd[13583]: From: http://www.samba.org/samba/docs/Samba3-HOWTO.pdf Mar 11 09:51:19 pingwin smbd[13583]: [2009/03/11 09:51:19, 0] lib/fault.c:fault_report(44) Mar 11 09:51:19 pingwin smbd[13583]: =============================================================== Mar 11 09:51:19 pingwin smbd[13583]: [2009/03/11 09:51:19, 0] lib/util.c:smb_panic(1673) Mar 11 09:51:19 pingwin smbd[13583]: PANIC (pid 13583): internal error Mar 11 09:51:19 pingwin smbd[13583]: [2009/03/11 09:51:19, 0] lib/util.c:log_stack_trace(1777) Mar 11 09:51:19 pingwin smbd[13583]: BACKTRACE: 9 stack frames: Mar 11 09:51:19 pingwin smbd[13583]: #0 /usr/sbin/smbd(log_stack_trace+0x2d) [0xb7c48ca5] Mar 11 09:51:19 pingwin smbd[13583]: #1 /usr/sbin/smbd(smb_panic+0x7c) [0xb7c48dfe] Mar 11 09:51:19 pingwin smbd[13583]: #2 /usr/sbin/smbd [0xb7c3397b] Mar 11 09:51:19 pingwin smbd[13583]: #3 [0xb7961400] Mar 11 09:51:19 pingwin smbd[13583]: #4 /usr/lib/libtalloc.so.1(talloc_free+0x3d) [0xb7777f12] Mar 11 09:51:19 pingwin smbd[13583]: #5 /usr/sbin/smbd(dns_register_close+0x4f) [0xb7a761d9] Mar 11 09:51:19 pingwin smbd[13583]: #6 /usr/sbin/smbd [0xb7eb0046] Mar 11 09:51:19 pingwin smbd[13583]: #7 /usr/sbin/smbd(main+0xb87) [0xb7eb0dec] Mar 11 09:51:19 pingwin smbd[13583]: #8 /lib/libc.so.6(__libc_start_main+0xee) [0xb762d6ee] Mar 11 09:51:19 pingwin smbd[13583]: [2009/03/11 09:51:19, 0] lib/fault.c:dump_core(218) Mar 11 09:51:19 pingwin smbd[13583]: Can not dump core: corepath not set up
And: [2009/03/11 11:14:48, 0] lib/util.c:smb_panic(1673) PANIC (pid 6151): internal error [2009/03/11 11:14:48, 0] lib/util.c:log_stack_trace(1777) BACKTRACE: 8 stack frames: #0 /usr/sbin/smbd(log_stack_trace+0x2d) [0xb7cd0ca5] #1 /usr/sbin/smbd(smb_panic+0x7c) [0xb7cd0dfe] #2 /usr/sbin/smbd [0xb7cbb97b] #3 [0xb79e9400] #4 /usr/sbin/smbd(dns_register_close+0x2b) [0xb7afe1b5] #5 /usr/sbin/smbd [0xb7f38046] #6 /usr/sbin/smbd(main+0xb87) [0xb7f38dec] #7 /lib/libc.so.6(__libc_start_main+0xee) [0xb76b56ee]
Can you compile with debug symbols (-g), then add the following to the [global] section of your smb.conf: panic action = "/bin/sleep 99999" then reproduce the crash. You'll get a sleep process, whose parent will be the crashed smbd. Attach to the crashed smbd with gdb, and type "bt" to get a full backtrace (which should include line numbers). If you can do this today we'll be able to get the fix into 3.3.2 (due tomorrow). Thanks, Jeremy.
I wasn't able to do that and now I've switched to native avahi backend (bug #6198) so can't reproduce anymore without some effort.
Resolving as WONTFIX. The original crash is gone with the new avahi code, and I will not go back fixing dnsregister.c. I've left the original dnsregister code in, but it's disabled by default. I've left it in because there might be platforms like MacOS/X that don't have avahi around. I think it would be up to Apple to fix up the dnsregister code in case someone is interested. Volker