[Samba] samba 4.9.5 smbd panic

Wed Jan 15 10:53:51 UTC 2020

On 15/01/2020 10:16, Andrea Cucciarre' via samba wrote:
> Hello,
>
> Some of my system running Samba 4.9.5 are suffering the following smbd 
> panic:
>
> Jan 14 21:15:56 fact-hf01 smbd[444]: [ID 702911 daemon.error] 
> [2020/01/14 21:15:56.552277,  0] ../lib/util/fault.c:79(fault_report)
> Jan 14 21:15:56 fact-hf01 smbd[444]: [ID 702911 daemon.error] 
> ===============================================================
> Jan 14 21:15:56 fact-hf01 smbd[444]: [ID 702911 daemon.error] 
> [2020/01/14 21:15:56.554475,  0] ../lib/util/fault.c:80(fault_report)
> Jan 14 21:15:56 fact-hf01 smbd[444]: [ID 702911 daemon.error] INTERNAL 
> ERROR: Signal 11 in pid 444 (4.9.5)
> Jan 14 21:15:56 fact-hf01 smbd[444]: [ID 702911 daemon.error] Please 
> read the Trouble-Shooting section of the Samba HOWTO
> Jan 14 21:15:56 fact-hf01 smbd[444]: [ID 702911 daemon.error] 
> [2020/01/14 21:15:56.554638,  0] ../lib/util/fault.c:82(fault_report)
> Jan 14 21:15:56 fact-hf01 smbd[444]: [ID 702911 daemon.error] 
> ===============================================================
> Jan 14 21:15:56 fact-hf01 smbd[444]: [ID 702911 daemon.error] 
> [2020/01/14 21:15:56.554713,  0] ../source3/lib/util.c:816(smb_panic_s3)
> Jan 14 21:15:56 fact-hf01 smbd[444]: [ID 702911 daemon.error] PANIC 
> (pid 444): internal error
> Jan 14 21:15:56 fact-hf01 smbd[444]: [ID 702911 daemon.error] 
> [2020/01/14 21:15:56.658060,  0] ../lib/util/fault.c:261(log_stack_trace)
> Jan 14 21:15:56 fact-hf01 smbd[444]: [ID 702911 daemon.error] 
> BACKTRACE: 60 stack frames:
> Jan 14 21:15:56 fact-hf01 smbd[444]: [ID 702911 daemon.error] #0 
> /opt/samba/lib/libsamba-util.so.0.0.1'log_stack_trace+0x26 [0xfedabc3e]
> Jan 14 21:15:56 fact-hf01 smbd[444]: [ID 702911 daemon.error] #1 
> /opt/samba/lib/libsmbconf.so.0'smb_panic_s3+0x68 [0xfe8b184f]
> Jan 14 21:15:56 fact-hf01 smbd[444]: [ID 702911 daemon.error] #2 
> /opt/samba/lib/libsamba-util.so.0.0.1'smb_panic+0x2a [0xfedabc00]
> Jan 14 21:15:56 fact-hf01 smbd[444]: [ID 702911 daemon.error] #3 
> /opt/samba/lib/libsamba-util.so.0.0.1'sig_fault+0x0 [0xfedab910]
> Jan 14 21:15:56 fact-hf01 smbd[444]: [ID 702911 daemon.error] #4 
> /opt/samba/lib/libsamba-util.so.0.0.1'sig_fault+0x1b [0xfedab92b]
> Jan 14 21:15:56 fact-hf01 smbd[444]: [ID 702911 daemon.error] #5 
> /lib/libc.so.1'__sighndlr+0x15 [0xfc57c465]
> Jan 14 21:15:56 fact-hf01 smbd[444]: [ID 702911 daemon.error] #6 
> /lib/libc.so.1'call_user_handler+0x298 [0xfc570ceb]
> Jan 14 21:15:56 fact-hf01 smbd[444]: [ID 702911 daemon.error] #7 
> /opt/samba/lib/private/libsmbd-base-samba4.so'change_to_user+0x2a 
> [0xfe59ed5a]
> Jan 14 21:15:56 fact-hf01 smbd[444]: [ID 702911 daemon.error] #8 
> /opt/samba/lib/private/libsmbd-base-samba4.so'change_to_user_by_fsp+0x2e 
> [0xfe59eeab]
> Jan 14 21:15:56 fact-hf01 smbd[444]: [ID 702911 daemon.error] #9 
> /opt/samba/lib/private/libsmbd-base-samba4.so'vfswrap_offload_write_cleanup+0x5c 
> [0xfe4f3c39]
> Jan 14 21:15:56 fact-hf01 smbd[444]: [ID 702911 daemon.error] #10 
> /opt/samba/lib/private/libtevent.so.0.9.37'tevent_req_cleanup+0x4b 
> [0xfec48771]
> Jan 14 21:15:56 fact-hf01 smbd[444]: [ID 702911 daemon.error] #11 
> /opt/samba/lib/private/libtevent.so.0.9.37'tevent_req_received+0xad 
> [0xfec48ade]
> Jan 14 21:15:56 fact-hf01 smbd[444]: [ID 702911 daemon.error] #12 
> /opt/samba/lib/private/libtevent.so.0.9.37'tevent_req_destructor+0x1e 
> [0xfec486b4]
> Jan 14 21:15:56 fact-hf01 smbd[444]: [ID 702911 daemon.error] #13 
> /opt/samba/lib/private/libtalloc.so.2.1.14'_tc_free_internal+0xf6 
> [0xfecc373b]
> Jan 14 21:15:56 fact-hf01 smbd[444]: [ID 702911 daemon.error] #14 
> /opt/samba/lib/private/libtalloc.so.2.1.14'_tc_free_children_internal+0x7a 
> [0xfecc45de]
> .......
>
> # pstack core\ \(1\).smbd
> core 'core (1).smbd' of 444:    /opt/samba/sbin/smbd --daemon
> -----------------  lwp# 1 / thread# 1  --------------------
>  fc581035 _lwp_kill (1, 6, 8046b60, fc5ef000, fc5ef000, 0) + 15
>  fc515eeb raise    (6, 0, 8046b80, 0, 0, 0) + 2b
>  fc4f0aae abort    (fe8ffff0, fc1b2a40, 8046be8, fe8b19a5, fc5ef000, 
> fee05a6c) + 10e
>  fe8c31ed ???????? (fc5ef000, fee05a6c, 8046c08, 810a118, fedf4e80, 
> fee05a6c)
>  fe8b19a5 readdirname (fedf4f75, 808d590, 8046c14, fedabbe2)
>  fedabc00 smb_panic (fedf4f75, 0, fedf4f5e, fedf50c4, fc518c46, 
> fc5ef000) + 2a
>  fedab910 sig_fault (b, fc5ef000, 8046c9c, fedab91b)
>  fedab92b sig_fault (b, 0, 8046d10, fc5ef000, fc5ef000, fc1b2a40) + 1b
>  fc57c465 __sighndlr (b, 0, 8046d10, fedab910, 80a44e0, 8046ca8) + 15
>  fc570ceb call_user_handler (b, 0, 8046d10, fc1b2a40, fc5ef804, 
> 8046d28) + 298
>  fc570d89 sigacthandler (b, 0, 8046d10) + 80
>  --- called from signal handler with signal 11 (SIGSEGV) ---
>  fe59ed5a change_to_user (fdea6642, 0, 0, fe59ee89) + 2a
>  fe59eeab change_to_user_by_fsp (812bdd8, fe6d7418, fe6d73f0, 
> fe4f3be9) + 2e
>  fe4f3c39 vfswrap_offload_write_cleanup (8160b98, 6, 8160be8, 
> fec48731) + 5c
>  fec48771 tevent_req_cleanup (8160b98, fec52af0, 26011999, fec48a3d) + 4b
>  fec48ade tevent_req_received (8160b98, 0, 8160b68, fec486a2) + ad
>  fec486b4 tevent_req_destructor (8160b98, 0, 8047048, fecc3651) + 1e
>  fecc373b _tc_free_internal (8160b68, fec52b30, 0, fecc4570) + f6
>  fecc45de _tc_free_children_internal (8161220, 8161250, fec52b30, 
> fecc3651) + 7a
>  fecc389a _tc_free_internal (8161220, fec52b30, 0, fecc39c4) + 255
>  fecc3a50 _talloc_free_internal (8161250, fec52b30, 8047108, fecc48a0) 
> + 98
>  fecc497e _talloc_free (8161250, fec52b30, 8047138, fec48a3d) + ea
>  fec48b01 tevent_req_received (8161170, 816c250, 8161140, fec486a2) + d0
>  fec486b4 tevent_req_destructor (8161170, fec52b30, fec52b30, 
> fecc3651) + 1e
>  fecc373b _tc_free_internal (8161140, fec52b30, 80471d8, fecc4570) + f6
>  fecc45de _tc_free_children_internal (816c1a0, 816c1d0, fec52b30, 
> fecc3651) + 7a
>  fecc389a _tc_free_internal (816c1a0, fec52b30, 4, fecc39c4) + 255
>  fecc3a50 _talloc_free_internal (816c1d0, fec52b30, 809fac8, fecc48a0) 
> + 98
>  fecc497e _talloc_free (816c1d0, fec52b30, 0, fec48a3d) + ea
>
> Any idea what could be the root-cause?
>
First, Samba shouldn't panic, so we are going to need more info. What OS 
? Is this using OS packages or have you compiled Samba yourself ? How 
are you running Samba, supplying your smb.conf will help. Can you get 
level 10 logs ?

Rowland