Package: samba
Version: 2:4.22.0+dfsg-1+b1
Severity: important

Dear Maintainer,

Since a recent update of the samba package, samba panics
when one client (a HP Color LaserJet Pro MFP M477fdw printer) tries to access a share.

Before, this worked without any issue.

The panis log:

[2025/03/15 23:41:09.323009, 0] source3/smbd/smb2_oplock.c:156(release_file_oplock)
PANIC: assert failed at source3/smbd/smb2_oplock.c(156): sconn->oplocks.exclusive_open>=0
[2025/03/15 23:41:09.323109, 0] lib/util/fault.c:178(smb_panic_log)
===============================================================
[2025/03/15 23:41:09.323132, 0] lib/util/fault.c:179(smb_panic_log)
INTERNAL ERROR: assert failed: sconn->oplocks.exclusive_open>=0 in smbd (smbd[192.168.10) (client [192.168.10.20]) pid 1500210 (4.22.0-Debian-4.22.0+dfsg-1)
[2025/03/15 23:41:09.323153, 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
[2025/03/15 23:41:09.323190, 0] lib/util/fault.c:191(smb_panic_log)
===============================================================
[2025/03/15 23:41:09.323210, 0] lib/util/fault.c:192(smb_panic_log)
PANIC (pid 1500210): assert failed: sconn->oplocks.exclusive_open>=0 in 4.22.0-Debian-4.22.0+dfsg-1
[2025/03/15 23:41:09.324071, 0] lib/util/fault.c:303(log_stack_trace)
BACKTRACE: 26 stack frames:
#0 /usr/lib/x86_64-linux-gnu/samba/libgenrand-private-samba.so.0(log_stack_trace+0x2d) [0x7f9cc1a2e5bd]
#1 /usr/lib/x86_64-linux-gnu/samba/libgenrand-private-samba.so.0(smb_panic+0xd) [0x7f9cc1a2e85d]
#2 /usr/lib/x86_64-linux-gnu/samba/libsmbd-base-private-samba.so.0(release_file_oplock+0xf5) [0x7f9cc1ec3f45]
#3 /usr/lib/x86_64-linux-gnu/samba/libsmbd-base-private-samba.so.0(close_file_smb+0x6f8) [0x7f9cc1e62ff8]
#4 /usr/lib/x86_64-linux-gnu/samba/libsmbd-base-private-samba.so.0(+0xc333e) [0x7f9cc1e9c33e]
#5 /usr/lib/x86_64-linux-gnu/samba/libsmbd-base-private-samba.so.0(smbd_smb2_request_process_close+0x1ee) [0x7f9cc1e9cd7e]
#6 /usr/lib/x86_64-linux-gnu/samba/libsmbd-base-private-samba.so.0(smbd_smb2_request_dispatch+0x1b04) [0x7f9cc1e8f184]
#7 /usr/lib/x86_64-linux-gnu/samba/libsmbd-base-private-samba.so.0(+0xb77f2) [0x7f9cc1e907f2]
#8 /lib/x86_64-linux-gnu/libtevent.so.0(tevent_common_invoke_fd_handler+0x95) [0x7f9cc1b9c815]
#9 /lib/x86_64-linux-gnu/libtevent.so.0(+0xfa76) [0x7f9cc1ba3a76]
#10 /lib/x86_64-linux-gnu/libtevent.so.0(+0xd48b) [0x7f9cc1ba148b]
#11 /lib/x86_64-linux-gnu/libtevent.so.0(_tevent_loop_once+0x93) [0x7f9cc1b9b953]
#12 /lib/x86_64-linux-gnu/libtevent.so.0(tevent_common_loop_wait+0x1b) [0x7f9cc1b9bc4b]
#13 /lib/x86_64-linux-gnu/libtevent.so.0(+0xd41b) [0x7f9cc1ba141b]
#14 /usr/lib/x86_64-linux-gnu/samba/libsmbd-base-private-samba.so.0(smbd_process+0x895) [0x7f9cc1e7d0e5]
#15 smbd: client [192.168.10.20](+0xa1e7) [0x563947b541e7]
#16 /lib/x86_64-linux-gnu/libtevent.so.0(tevent_common_invoke_fd_handler+0x95) [0x7f9cc1b9c815]
#17 /lib/x86_64-linux-gnu/libtevent.so.0(+0xfa76) [0x7f9cc1ba3a76]
#18 /lib/x86_64-linux-gnu/libtevent.so.0(+0xd48b) [0x7f9cc1ba148b]
#19 /lib/x86_64-linux-gnu/libtevent.so.0(_tevent_loop_once+0x93) [0x7f9cc1b9b953]
#20 /lib/x86_64-linux-gnu/libtevent.so.0(tevent_common_loop_wait+0x1b) [0x7f9cc1b9bc4b]
#21 /lib/x86_64-linux-gnu/libtevent.so.0(+0xd41b) [0x7f9cc1ba141b]
#22 smbd: client [192.168.10.20](main+0x14a0) [0x563947b51330]
#23 /lib/x86_64-linux-gnu/libc.so.6(+0x29ca8) [0x7f9cc180cca8]
#24 /lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0x85) [0x7f9cc180cd65]
#25 smbd: client [192.168.10.20](_start+0x21) [0x563947b51e31]
[2025/03/15 23:41:09.324416, 0] source3/lib/util.c:700(call_panic_action)
call_panic_action: Calling panic action [/usr/share/samba/panic-action 1500210]
[2025/03/15 23:41:09.367958, 0] source3/lib/util.c:723(call_panic_action)
call_panic_action: action returned status 0
[2025/03/15 23:41:09.368245, 0] source3/lib/dumpcore.c:316(dump_core)
dumping core in /var/log/samba/cores/smbd



-- Package-specific info:
* /etc/samba/smb.conf present, but not attached

-- System Information:
Debian Release: trixie/sid
APT prefers testing
APT policy: (990, 'testing'), (500, 'stable-security'), (500, 'stable'), (400, 'unstable')
Architecture: amd64 (x86_64)

Kernel: Linux 6.12.17-amd64 (SMP w/8 CPU threads; PREEMPT)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8), LANGUAGE=en_US:en
Shell: /bin/sh linked to /usr/bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled

Versions of packages samba depends on:
ii init-system-helpers 1.68
ii libbsd0 0.12.2-2
ii libc6 2.41-4
ii libcups2t64 2.4.10-2+b1
ii libdbus-1-3 1.16.2-2
ii libgnutls30t64 3.8.9-2
ii libldap2 2.6.9+dfsg-1
ii libldb2 2:2.11.0+samba4.22.0+dfsg-1+b1
ii libpopt0 1.19+dfsg-2
ii libtalloc2 2:2.4.3+samba4.22.0+dfsg-1+b1
ii libtasn1-6 4.20.0-2
ii libtdb1 2:1.4.13+samba4.22.0+dfsg-1+b1
ii libtevent0t64 2:0.16.2+samba4.22.0+dfsg-1+b1
ii libtirpc3t64 1.3.4+ds-1.3+b1
ii liburing2 2.9-1
ii passwd 1:4.17.3-1
ii procps 2:4.0.4-7
ii samba-common 2:4.22.0+dfsg-1
ii samba-common-bin 2:4.22.0+dfsg-1+b1
ii samba-libs [libndr6] 2:4.22.0+dfsg-1+b1

Versions of packages samba recommends:
ii attr 1:2.5.2-3
ii python3-samba 2:4.22.0+dfsg-1+b1
ii samba-ad-dc 2:4.22.0+dfsg-1+b1

Versions of packages samba suggests:
pn ctdb <none>
pn samba-vfs-ceph <none>
pn samba-vfs-glusterfs <none>
pn ufw <none>
ii winbind 2:4.22.0+dfsg-1+b1

--- SoupGate-Win32 v1.05
* Origin: fsxNet Usenet Gateway (21:1/5)

Control: severity -1 grave
Control: found -1 2:4.22.0+dfsg-1+b1
Control: fixed -1 2:4.21.4+dfsg-1

Same issue here. I can reproduce with 2:4.22.0+dfsg-1+b1 within
seconds just by playing some music with foobar2000 from a Windows 11
client, and it breaks playback. Bumping severity due to multiple
reports of severe breakage.

I am unable to reproduce with 2:4.21.4+dfsg-1.

Andre: you can get previous versions of packages from the Debian
snapshot archive: https://snapshot.debian.org/

Specifically, to downgrade to samba 2:4.21.4+dfsg-1, you can use this config:

$ cat /etc/apt/sources.list.d/debian-20250306T211336Z.list
# For samba 2:4.21.3+dfsg-6
deb [check-valid-until=no] https://snapshot.debian.org/archive/debian/20250306T211336Z/ sid main
$ apt-get update
$ apt-get install samba=2:4.21.4+dfsg-1

Then go through the conflict solutions until you get offered to bulk
downgrade the dependencies.

--- SoupGate-Win32 v1.05
* Origin: fsxNet Usenet Gateway (21:1/5)

So. What's an easy way to reproduce this, having
a test setup? I've some windows systems and linux.
What should I do to trigger this issue?
So far I can't find the way to trigger it.

Thanks,

/mjt

--- SoupGate-Win32 v1.05
* Origin: fsxNet Usenet Gateway (21:1/5)

I'm currently traveling, with no access to my printer. Etienne, would

you be able to produce such log in the coming days? Otherwise, I will
look at it on my side when I'm back.

I'm back home and managed to create log files. See: https://bugzilla.samba.org/show_bug.cgi?id=15836#c3

Cheers,

Timo

--- SoupGate-Win32 v1.05
* Origin: fsxNet Usenet Gateway (21:1/5)