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[al <2108981@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

Release version: 25.04
Package vers: 2:4.21.4+dfsg-1ubuntu3

My server is an i5-6500 with 64GB RAM, a 250G boot SSD (ext4), 2x 1TB
SSDs in RAID1 (btrfs) and 2x 8TB HDDs in RAID 1 (btrfs).

I had 24.10 installed and samba had no problems. I upgraded to 25.04 and
samba now segfaults every time I modify a file. Creating a file is fine
that I can tell.

Steps to reproduce:
1. Create a blank file called test.txt and save it. It saves and opens fine.
2. Edit the file remotely then save (I am using xed on linux mint for text files).
3. Close the file, then reopen. It will pop up with an error and act if it's 'corrupt'. It will not read until the service is restarted.
4. Open the file on the server using nano. It will have your changes in it as if it saved just fine.
5. Restart smbd service. The file will load with the changes until it is edited again.
6. See log file which will show a segfault error occurred.

I figured something got messed up during the update, so I cleaned my
boot SSD and reinstalled a fresh ubuntu 25.04 release. First and only
thing I installed was samba after mounting the storage disks and the
error still happens.

Reinstalled 24.10 and there are no issues. Files load, edit, and save
just fine.

Attached the log entry below generated from the
/var/log/samba/log.(client) file.

Currently I do not have 25.04 installed as I need my server working but
will try to update with as much info as I can as needed.


---

[2025/04/24 06:55:33.944945,  0] lib/util/fault.c:178(smb_panic_log)
  ===============================================================
[2025/04/24 06:55:33.945041,  0] lib/util/fault.c:179(smb_panic_log)
  INTERNAL ERROR: Signal 11: Segmentation fault in smbd (smbd[192.168.2.) (client [192.168.2.248]) pid 1362 (4.21.4-Ubuntu-4.21.4+dfsg-1ubuntu3)
[2025/04/24 06:55:33.945049,  0] lib/util/fault.c:186(smb_panic_log)
  If you are running a recent Samba version, and if you think this problem is not yet fixed in the latest versions, please consider reporting this bug, see https://wiki.samba.org/index.php/Bug_Reporting
[2025/04/24 06:55:33.945055,  0] lib/util/fault.c:191(smb_panic_log)
  ===============================================================
[2025/04/24 06:55:33.945060,  0] lib/util/fault.c:192(smb_panic_log)
  PANIC (pid 1362): Signal 11: Segmentation fault in 4.21.4-Ubuntu-4.21.4+dfsg-1ubuntu3
[2025/04/24 06:55:33.945338,  0] lib/util/fault.c:303(log_stack_trace)
  BACKTRACE: 31 stack frames:
   #0 /usr/lib/x86_64-linux-gnu/samba/libgenrand-private-samba.so.0(log_stack_trace+0x35) [0x7f3a9af49515]
   #1 /usr/lib/x86_64-linux-gnu/samba/libgenrand-private-samba.so.0(smb_panic+0x15) [0x7f3a9af49d25]
   #2 /usr/lib/x86_64-linux-gnu/samba/libgenrand-private-samba.so.0(+0x2dca) [0x7f3a9af49dca]
   #3 /lib/x86_64-linux-gnu/libc.so.6(+0x45810) [0x7f3a9ac45810]
   #4 /usr/lib/x86_64-linux-gnu/samba/libcli-smb-common-private-samba.so.0(smb2_lease_key_equal+0x9) [0x7f3a9a4cdb49]
   #5 /usr/lib/x86_64-linux-gnu/samba/libsmbd-base-private-samba.so.0(+0xcdcef) [0x7f3a9b3c4cef]
   #6 /usr/lib/x86_64-linux-gnu/samba/libsmbd-base-private-samba.so.0(share_mode_forall_entries+0x1bf) [0x7f3a9b43dcef]
   #7 /usr/lib/x86_64-linux-gnu/samba/libsmbd-base-private-samba.so.0(share_mode_forall_leases+0x66) [0x7f3a9b436956]
   #8 /usr/lib/x86_64-linux-gnu/samba/libsmbd-base-private-samba.so.0(+0xcddd2) [0x7f3a9b3c4dd2]
   #9 /usr/lib/x86_64-linux-gnu/samba/libsmbd-base-private-samba.so.0(smbd_smb2_request_process_setinfo+0x881) [0x7f3a9b3c5791]
   #10 /usr/lib/x86_64-linux-gnu/samba/libsmbd-base-private-samba.so.0(smbd_smb2_request_dispatch+0x1aba) [0x7f3a9b3a99ba]
   #11 /usr/lib/x86_64-linux-gnu/samba/libsmbd-base-private-samba.so.0(smbd_smb2_request_dispatch_immediate+0x57) [0x7f3a9b3aad07]
   #12 /lib/x86_64-linux-gnu/libtevent.so.0(tevent_common_invoke_immediate_handler+0x278) [0x7f3a9b0c5f88]
   #13 /lib/x86_64-linux-gnu/libtevent.so.0(tevent_common_loop_immediate+0x22) [0x7f3a9b0c60b2]
   #14 /lib/x86_64-linux-gnu/libtevent.so.0(+0x10d80) [0x7f3a9b0cad80]
   #15 /lib/x86_64-linux-gnu/libtevent.so.0(+0x5f04) [0x7f3a9b0bff04]
   #16 /lib/x86_64-linux-gnu/libtevent.so.0(_tevent_loop_once+0x99) [0x7f3a9b0c1cf9]
   #17 /lib/x86_64-linux-gnu/libtevent.so.0(tevent_common_loop_wait+0x2b) [0x7f3a9b0c1e2b]
   #18 /lib/x86_64-linux-gnu/libtevent.so.0(+0x5f84) [0x7f3a9b0bff84]
   #19 /usr/lib/x86_64-linux-gnu/samba/libsmbd-base-private-samba.so.0(smbd_process+0x870) [0x7f3a9b395ec0]
   #20 smbd: client [192.168.2.248](+0xa886) [0x60fe86845886]
   #21 /lib/x86_64-linux-gnu/libtevent.so.0(tevent_common_invoke_fd_handler+0xe3) [0x7f3a9b0c5be3]
   #22 /lib/x86_64-linux-gnu/libtevent.so.0(+0x1107f) [0x7f3a9b0cb07f]
   #23 /lib/x86_64-linux-gnu/libtevent.so.0(+0x5f04) [0x7f3a9b0bff04]
   #24 /lib/x86_64-linux-gnu/libtevent.so.0(_tevent_loop_once+0x99) [0x7f3a9b0c1cf9]
   #25 /lib/x86_64-linux-gnu/libtevent.so.0(tevent_common_loop_wait+0x2b) [0x7f3a9b0c1e2b]
   #26 /lib/x86_64-linux-gnu/libtevent.so.0(+0x5f84) [0x7f3a9b0bff84]
   #27 smbd: client [192.168.2.248](main+0x14fc) [0x60fe868431dc]
   #28 /lib/x86_64-linux-gnu/libc.so.6(+0x2a338) [0x7f3a9ac2a338]
   #29 /lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0x8b) [0x7f3a9ac2a3fb]
   #30 smbd: client [192.168.2.248](_start+0x25) [0x60fe86843d15]
[2025/04/24 06:55:33.945425,  0] source3/lib/util.c:686(call_panic_action)
  call_panic_action: Calling panic action [/usr/share/samba/panic-action 1362]
[2025/04/24 06:55:33.947236,  0] source3/lib/util.c:709(call_panic_action)
  call_panic_action: action returned status 0
[2025/04/24 06:55:33.947286,  0] source3/lib/dumpcore.c:318(dump_core)
  coredump is handled by helper binary specified at /proc/sys/kernel/core_pattern

---


Thank you  :)

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

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https://bugs.launchpad.net/bugs/2108981

Title:
  samba segfaults when modifying any file

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