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[David Mora <2115450@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

After applying the updates from
(https://ubuntu.com/security/notices/USN-7582-1) we are seeing
samba/winbind crash/panic when attempting to log in with SSH. The logs
are below. This is happening on both of our test 16.04/18.04 machines.
I'm not sure if related, but these machines also run the FIPS
kernel/etc. from ESM/Ubuntu Pro. Prior to the update samba is working
fine.


Jun 25 12:38:48 <machinename> systemd[1]: Started Samba Winbind Daemon.
Jun 25 12:38:48 <machinename> winbindd[21449]: [2025/06/25 12:38:48.460288,  0] ../lib/util/become_daemon.c:124(daemon_ready)
Jun 25 12:38:48 <machinename> winbindd[21449]:   STATUS=daemon 'winbindd' finished starting up and ready to serve connections
Jun 25 12:39:16 <machinename> winbindd[21473]: [2025/06/25 12:39:16.457152,  0] ../lib/util/fault.c:78(fault_report)
Jun 25 12:39:16 <machinename> winbindd[21473]:   ===============================================================
Jun 25 12:39:16 <machinename> winbindd[21473]: [2025/06/25 12:39:16.457316,  0] ../lib/util/fault.c:79(fault_report)
Jun 25 12:39:16 <machinename> winbindd[21473]:   INTERNAL ERROR: Signal 11 in pid 21473 (4.7.6-Ubuntu)
Jun 25 12:39:16 <machinename> winbindd[21473]:   Please read the Trouble-Shooting section of the Samba HOWTO
Jun 25 12:39:16 <machinename> winbindd[21473]: [2025/06/25 12:39:16.457456,  0] ../lib/util/fault.c:81(fault_report)
Jun 25 12:39:16 <machinename> winbindd[21473]:   ===============================================================
Jun 25 12:39:16 <machinename> winbindd[21473]: [2025/06/25 12:39:16.457555,  0] ../source3/lib/util.c:815(smb_panic_s3)
Jun 25 12:39:16 <machinename> winbindd[21473]:   PANIC (pid 21473): internal error
Jun 25 12:39:16 <machinename> winbindd[21473]: [2025/06/25 12:39:16.459181,  0] ../source3/lib/util.c:926(log_stack_trace)
Jun 25 12:39:16 <machinename> winbindd[21473]:   BACKTRACE: 28 stack frames:
Jun 25 12:39:16 <machinename> winbindd[21473]:    #0 /usr/lib/x86_64-linux-gnu/libsmbconf.so.0(log_stack_trace+0x1f) [0x7fd851987b7f]
Jun 25 12:39:16 <machinename> winbindd[21473]:    #1 /usr/lib/x86_64-linux-gnu/libsmbconf.so.0(smb_panic_s3+0x20) [0x7fd851987c50]
Jun 25 12:39:16 <machinename> winbindd[21473]:    #2 /usr/lib/x86_64-linux-gnu/libsamba-util.so.0(smb_panic+0x2f) [0x7fd854a979af]
Jun 25 12:39:16 <machinename> winbindd[21473]:    #3 /usr/lib/x86_64-linux-gnu/libsamba-util.so.0(+0x19bc6) [0x7fd854a97bc6]
Jun 25 12:39:16 <machinename> winbindd[21473]:    #4 /lib/x86_64-linux-gnu/libpthread.so.0(+0x12980) [0x7fd856774980]
Jun 25 12:39:16 <machinename> winbindd[21473]:    #5 /usr/lib/x86_64-linux-gnu/samba/libkrb5-samba4.so.26(krb5_data_free+0x4) [0x7fd8535141b4]
Jun 25 12:39:16 <machinename> winbindd[21473]:    #6 /usr/lib/x86_64-linux-gnu/samba/libkrb5-samba4.so.26(krb5_pac_free+0xd) [0x7fd85352e29d]
Jun 25 12:39:16 <machinename> winbindd[21473]:    #7 /usr/lib/x86_64-linux-gnu/samba/libkrb5-samba4.so.26(krb5_pac_parse+0x9d) [0x7fd85352e34d]
Jun 25 12:39:16 <machinename> winbindd[21473]:    #8 /usr/lib/x86_64-linux-gnu/samba/libkrb5-samba4.so.26(krb5_rd_req_ctx+0x5a2) [0x7fd853531d42]
Jun 25 12:39:16 <machinename> winbindd[21473]:    #9 /usr/lib/x86_64-linux-gnu/samba/libgssapi-samba4.so.2(+0x1fce4) [0x7fd84d133ce4]
Jun 25 12:39:16 <machinename> winbindd[21473]:    #10 /usr/lib/x86_64-linux-gnu/samba/libgssapi-samba4.so.2(gss_accept_sec_context+0x117) [0x7fd84d1387c7]
Jun 25 12:39:16 <machinename> winbindd[21473]:    #11 /usr/lib/x86_64-linux-gnu/samba/libgse.so.0(+0x9f67) [0x7fd84fe72f67]
Jun 25 12:39:16 <machinename> winbindd[21473]:    #12 /usr/lib/x86_64-linux-gnu/samba/libgensec.so.0(gensec_update_ev+0x64) [0x7fd8508b7fb4]
Jun 25 12:39:16 <machinename> winbindd[21473]:    #13 /usr/sbin/winbindd(kerberos_return_pac+0x487) [0x5567252411a7]
Jun 25 12:39:16 <machinename> winbindd[21473]:    #14 /usr/sbin/winbindd(winbindd_dual_pam_auth+0x1336) [0x556725255606]
Jun 25 12:39:16 <machinename> winbindd[21473]:    #15 /usr/sbin/winbindd(+0x51d8c) [0x55672526bd8c]
Jun 25 12:39:16 <machinename> winbindd[21473]:    #16 /usr/lib/x86_64-linux-gnu/libtevent.so.0(+0x9ed0) [0x7fd84e773ed0]
Jun 25 12:39:16 <machinename> winbindd[21473]:    #17 /usr/lib/x86_64-linux-gnu/libtevent.so.0(+0x8357) [0x7fd84e772357]
Jun 25 12:39:16 <machinename> winbindd[21473]:    #18 /usr/lib/x86_64-linux-gnu/libtevent.so.0(_tevent_loop_once+0x9d) [0x7fd84e76e7cd]
Jun 25 12:39:16 <machinename> winbindd[21473]:    #19 /usr/sbin/winbindd(+0x54368) [0x55672526e368]
Jun 25 12:39:16 <machinename> winbindd[21473]:    #20 /usr/sbin/winbindd(+0x54875) [0x55672526e875]
Jun 25 12:39:16 <machinename> winbindd[21473]:    #21 /usr/lib/x86_64-linux-gnu/libtevent.so.0(tevent_common_loop_immediate+0xd4) [0x7fd84e76f1a4]
Jun 25 12:39:16 <machinename> winbindd[21473]:    #22 /usr/lib/x86_64-linux-gnu/libtevent.so.0(+0x9cfb) [0x7fd84e773cfb]
Jun 25 12:39:16 <machinename> winbindd[21473]:    #23 /usr/lib/x86_64-linux-gnu/libtevent.so.0(+0x8357) [0x7fd84e772357]
Jun 25 12:39:16 <machinename> winbindd[21473]:    #24 /usr/lib/x86_64-linux-gnu/libtevent.so.0(_tevent_loop_once+0x9d) [0x7fd84e76e7cd]
Jun 25 12:39:16 <machinename> winbindd[21473]:    #25 /usr/sbin/winbindd(main+0xb20) [0x5567252402f0]
Jun 25 12:39:16 <machinename> winbindd[21473]:    #26 /lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xe7) [0x7fd84e39ac87]
Jun 25 12:39:16 <machinename> winbindd[21473]:    #27 /usr/sbin/winbindd(_start+0x2a) [0x556725240ada]
Jun 25 12:39:16 <machinename> winbindd[21473]: [2025/06/25 12:39:16.460581,  0] ../source3/lib/util.c:827(smb_panic_s3)
Jun 25 12:39:16 <machinename> winbindd[21473]:   smb_panic(): calling panic action [/usr/share/samba/panic-action 21473]
Jun 25 12:39:16 <machinename> postfix/sendmail[21664]: fatal: no login name found for user ID 1001110
Jun 25 12:39:16 <machinename> winbindd[21473]: [2025/06/25 12:39:16.526674,  0] ../source3/lib/util.c:835(smb_panic_s3)
Jun 25 12:39:16 <machinename> winbindd[21473]:   smb_panic(): action returned status 1
Jun 25 12:39:16 <machinename> winbindd[21473]: [2025/06/25 12:39:16.527609,  0] ../source3/lib/dumpcore.c:318(dump_core)
Jun 25 12:39:16 <machinename> winbindd[21473]:   coredump is handled by helper binary specified at /proc/sys/kernel/core_pattern

** Affects: samba (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/2115450

Title:
  samba crashing when attempting to authenticate user after applying
  updates for USN-7582-1

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