syzbot


WARNING in drv_unassign_vif_chanctx (3)

Status: upstream: reported C repro on 2025/08/05 15:57
Subsystems: wireless
[Documentation on labels]
Reported-by: syzbot+6506f7abde798179ecc4@syzkaller.appspotmail.com
First crash: 163d, last: 30d
Discussions (5)
Title Replies (including bot) Last reply
[syzbot] [wireless?] WARNING in drv_unassign_vif_chanctx (3) 0 (2) 2025/11/27 10:55
[syzbot] Monthly wireless report (Nov 2025) 0 (1) 2025/11/27 07:44
[syzbot] Monthly wireless report (Oct 2025) 0 (1) 2025/10/27 08:42
[syzbot] Monthly wireless report (Sep 2025) 0 (1) 2025/09/25 16:01
[syzbot] Monthly wireless report (Aug 2025) 0 (1) 2025/08/25 13:19
Similar bugs (2)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream WARNING in drv_unassign_vif_chanctx wireless -1 2 685d 685d 0/29 auto-obsoleted due to no activity on 2024/06/05 06:49
upstream WARNING in drv_unassign_vif_chanctx (2) wireless -1 1 382d 378d 0/29 auto-obsoleted due to no activity on 2025/04/04 09:01
Last patch testing requests (2)
Created Duration User Patch Repo Result
2025/12/26 23:16 30m retest repro git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci OK log
2025/12/26 22:07 19m retest repro upstream OK log

Sample crash report:
bond0 (unregistering): Released all slaves
bond1 (unregistering): (slave vcan1): Releasing backup interface
vcan1: left promiscuous mode
bond1 (unregistering): Released all slaves
tipc: Left network mode
------------[ cut here ]------------
wlan1: Failed check-sdata-in-driver check, flags: 0x0
WARNING: net/mac80211/driver-ops.c:366 at 0x0, CPU#0: kworker/u8:2/36
Modules linked in:
CPU: 0 UID: 0 PID: 36 Comm: kworker/u8:2 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
Workqueue: netns cleanup_net
RIP: 0010:drv_unassign_vif_chanctx+0x204/0x7f0 net/mac80211/driver-ops.c:366
Code: 92 f0 f1 f6 48 8b 74 24 10 48 81 c6 20 01 00 00 48 89 74 24 10 e8 7c f0 f1 f6 48 8d 3d 15 1f c9 05 8b 54 24 04 48 8b 74 24 10 <67> 48 0f b9 3a e8 62 f0 f1 f6 4c 89 f2 48 b8 00 00 00 00 00 fc ff
RSP: 0018:ffffc90000ac7538 EFLAGS: 00010293
RAX: 0000000000000000 RBX: ffff88805556cd80 RCX: ffffffff8acbee61
RDX: 0000000000000000 RSI: ffff88805556c120 RDI: ffffffff90950de0
RBP: ffff888034bc8e80 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000000 R11: 00000000f2652180 R12: ffff88805556ead8
R13: 0000000000000000 R14: ffff88805556d7b8 R15: ffff88805556ea80
FS:  0000000000000000(0000) GS:ffff88812499c000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffeeba7fff8 CR3: 000000007bfff000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <TASK>
 ieee80211_assign_link_chanctx+0x3f1/0xf00 net/mac80211/chan.c:905
 __ieee80211_link_release_channel+0x273/0x4b0 net/mac80211/chan.c:1879
 ieee80211_link_release_channel+0x128/0x200 net/mac80211/chan.c:2154
 unregister_netdevice_many_notify+0x13f8/0x2570 net/core/dev.c:12305
 unregister_netdevice_many net/core/dev.c:12347 [inline]
 unregister_netdevice_queue net/core/dev.c:12161 [inline]
 unregister_netdevice_queue+0x305/0x3c0 net/core/dev.c:12151
 unregister_netdevice include/linux/netdevice.h:3389 [inline]
 _cfg80211_unregister_wdev+0x64b/0x800 net/wireless/core.c:1284
 ieee80211_remove_interfaces+0x34e/0x700 net/mac80211/iface.c:2394
 ieee80211_unregister_hw+0x55/0x3a0 net/mac80211/main.c:1681
 mac80211_hwsim_del_radio drivers/net/wireless/virtual/mac80211_hwsim.c:5915 [inline]
 hwsim_exit_net+0x788/0x1590 drivers/net/wireless/virtual/mac80211_hwsim.c:6806
 ops_exit_list net/core/net_namespace.c:199 [inline]
 ops_undo_list+0x2ee/0xab0 net/core/net_namespace.c:252
 cleanup_net+0x41b/0x830 net/core/net_namespace.c:695
 process_one_work+0x9ba/0x1b20 kernel/workqueue.c:3263
 process_scheduled_works kernel/workqueue.c:3346 [inline]
 worker_thread+0x6c8/0xf10 kernel/workqueue.c:3427
 kthread+0x3c5/0x780 kernel/kthread.c:463
 ret_from_fork+0x983/0xb10 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246
 </TASK>
----------------
Code disassembly (best guess):
   0:	92                   	xchg   %eax,%edx
   1:	f0 f1                	lock int1
   3:	f6 48 8b 74          	testb  $0x74,-0x75(%rax)
   7:	24 10                	and    $0x10,%al
   9:	48 81 c6 20 01 00 00 	add    $0x120,%rsi
  10:	48 89 74 24 10       	mov    %rsi,0x10(%rsp)
  15:	e8 7c f0 f1 f6       	call   0xf6f1f096
  1a:	48 8d 3d 15 1f c9 05 	lea    0x5c91f15(%rip),%rdi        # 0x5c91f36
  21:	8b 54 24 04          	mov    0x4(%rsp),%edx
  25:	48 8b 74 24 10       	mov    0x10(%rsp),%rsi
* 2a:	67 48 0f b9 3a       	ud1    (%edx),%rdi <-- trapping instruction
  2f:	e8 62 f0 f1 f6       	call   0xf6f1f096
  34:	4c 89 f2             	mov    %r14,%rdx
  37:	48                   	rex.W
  38:	b8 00 00 00 00       	mov    $0x0,%eax
  3d:	00 fc                	add    %bh,%ah
  3f:	ff                   	.byte 0xff

Crashes (2965):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2025/12/04 08:20 upstream a619fe35ab41 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root WARNING in drv_unassign_vif_chanctx
2025/12/04 07:04 upstream a619fe35ab41 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root WARNING in drv_unassign_vif_chanctx
2025/12/04 06:51 upstream a619fe35ab41 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root WARNING in drv_unassign_vif_chanctx
2025/12/04 05:22 upstream a619fe35ab41 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce WARNING in drv_unassign_vif_chanctx
2025/12/04 02:55 upstream a619fe35ab41 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root WARNING in drv_unassign_vif_chanctx
2025/12/04 00:34 upstream a619fe35ab41 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root WARNING in drv_unassign_vif_chanctx
2025/12/03 08:47 upstream 3f9f0252130e d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root WARNING in drv_unassign_vif_chanctx
2025/12/03 02:19 upstream 4a26e7032d7d d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce WARNING in drv_unassign_vif_chanctx
2025/12/02 02:18 upstream 1d18101a644e d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root WARNING in drv_unassign_vif_chanctx
2025/12/01 12:18 upstream 7d0a66e4bb90 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root WARNING in drv_unassign_vif_chanctx
2025/12/01 12:08 upstream 7d0a66e4bb90 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root WARNING in drv_unassign_vif_chanctx
2025/12/01 05:47 upstream e69c7c175115 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce WARNING in drv_unassign_vif_chanctx
2025/11/30 23:08 upstream e69c7c175115 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce WARNING in drv_unassign_vif_chanctx
2025/11/30 21:15 upstream e69c7c175115 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce WARNING in drv_unassign_vif_chanctx
2025/11/30 19:50 upstream e69c7c175115 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root WARNING in drv_unassign_vif_chanctx
2025/11/30 15:00 upstream 6bda50f4333f d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root WARNING in drv_unassign_vif_chanctx
2025/11/30 12:26 upstream 6bda50f4333f d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root WARNING in drv_unassign_vif_chanctx
2025/11/21 22:42 upstream fd95357fd8c6 c31c1b0b .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-badwrites-root WARNING in drv_unassign_vif_chanctx
2025/08/05 10:20 upstream 7e161a991ea7 abdcb213 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root WARNING in drv_unassign_vif_chanctx
2025/11/27 21:43 upstream 765e56e41a5a d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-386 WARNING in drv_unassign_vif_chanctx
2025/12/03 20:56 upstream 3f9f0252130e d1b870e1 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream WARNING in drv_unassign_vif_chanctx
2025/12/03 19:52 upstream 3f9f0252130e d1b870e1 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream WARNING in drv_unassign_vif_chanctx
2025/12/03 17:23 upstream 3f9f0252130e d1b870e1 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream WARNING in drv_unassign_vif_chanctx
2025/12/03 14:20 upstream 44fc84337b6e d1b870e1 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream WARNING in drv_unassign_vif_chanctx
2025/12/03 05:57 upstream 44fc84337b6e d1b870e1 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream WARNING in drv_unassign_vif_chanctx
2025/12/02 21:26 upstream 4a26e7032d7d d1b870e1 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream WARNING in drv_unassign_vif_chanctx
2025/12/02 15:25 upstream 4a26e7032d7d d1b870e1 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream WARNING in drv_unassign_vif_chanctx
2025/12/02 10:40 upstream 1d18101a644e d1b870e1 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream WARNING in drv_unassign_vif_chanctx
2025/12/02 09:17 upstream 1d18101a644e d1b870e1 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream WARNING in drv_unassign_vif_chanctx
2025/12/02 04:00 upstream 1d18101a644e d1b870e1 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream WARNING in drv_unassign_vif_chanctx
2025/12/02 00:37 upstream 1d18101a644e d1b870e1 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream WARNING in drv_unassign_vif_chanctx
2025/12/01 19:26 upstream 7d0a66e4bb90 d1b870e1 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream WARNING in drv_unassign_vif_chanctx
2025/12/01 17:01 upstream 7d0a66e4bb90 d1b870e1 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream WARNING in drv_unassign_vif_chanctx
2025/12/01 14:50 upstream 7d0a66e4bb90 d1b870e1 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream WARNING in drv_unassign_vif_chanctx
2025/12/01 13:31 upstream 7d0a66e4bb90 d1b870e1 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream WARNING in drv_unassign_vif_chanctx
2025/12/01 09:40 upstream 7d0a66e4bb90 d1b870e1 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream WARNING in drv_unassign_vif_chanctx
2025/12/01 08:03 upstream 7d0a66e4bb90 d1b870e1 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream WARNING in drv_unassign_vif_chanctx
2025/11/30 10:07 upstream 6bda50f4333f d1b870e1 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream WARNING in drv_unassign_vif_chanctx
2025/11/30 05:14 upstream 6bda50f4333f d1b870e1 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream WARNING in drv_unassign_vif_chanctx
2025/11/30 00:29 upstream 6bda50f4333f d1b870e1 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream WARNING in drv_unassign_vif_chanctx
2025/11/27 10:55 upstream 4941a17751c9 e8331348 .config console log report syz / log C [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream WARNING in drv_unassign_vif_chanctx
2025/12/03 13:18 upstream 44fc84337b6e d1b870e1 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 WARNING in drv_unassign_vif_chanctx
2025/12/03 11:43 upstream 44fc84337b6e d1b870e1 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 WARNING in drv_unassign_vif_chanctx
2025/12/03 07:27 upstream 44fc84337b6e d1b870e1 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 WARNING in drv_unassign_vif_chanctx
2025/12/02 22:38 upstream 4a26e7032d7d d1b870e1 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 WARNING in drv_unassign_vif_chanctx
2025/12/02 19:15 upstream 4a26e7032d7d d1b870e1 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 WARNING in drv_unassign_vif_chanctx
2025/12/02 13:45 upstream 4a26e7032d7d d1b870e1 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 WARNING in drv_unassign_vif_chanctx
2025/12/02 07:29 upstream 1d18101a644e d1b870e1 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 WARNING in drv_unassign_vif_chanctx
2025/12/02 06:29 upstream 1d18101a644e d1b870e1 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 WARNING in drv_unassign_vif_chanctx
2025/12/01 10:51 upstream 7d0a66e4bb90 d1b870e1 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 WARNING in drv_unassign_vif_chanctx
2025/11/30 02:09 upstream 6bda50f4333f d1b870e1 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 WARNING in drv_unassign_vif_chanctx
2025/11/26 09:59 net 0ebc27a4c67d 64219f15 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce WARNING in drv_unassign_vif_chanctx
2025/11/29 02:14 net-next ed01d2069e8b d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce WARNING in drv_unassign_vif_chanctx
2025/08/01 15:45 net-next d9104cec3e8f 40127d41 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce WARNING in drv_unassign_vif_chanctx
2025/11/24 17:25 linux-next 422f3140bbcb bf6fe8fe .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root WARNING in drv_unassign_vif_chanctx
2025/11/24 08:13 linux-next d724c6f85e80 4fb8ef37 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-rust-kasan-gce WARNING in drv_unassign_vif_chanctx
2025/12/12 22:06 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 05c93f3395ed d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 WARNING in drv_unassign_vif_chanctx
2025/12/09 16:23 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 05c93f3395ed d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 WARNING in drv_unassign_vif_chanctx
2025/12/08 12:21 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 05c93f3395ed d6526ea3 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 WARNING in drv_unassign_vif_chanctx
2025/12/03 23:00 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 05c93f3395ed d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 WARNING in drv_unassign_vif_chanctx
2025/11/30 03:22 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 05c93f3395ed d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 WARNING in drv_unassign_vif_chanctx
* Struck through repros no longer work on HEAD.