wlan0: failed to finalize CSA, disconnecting
general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]
CPU: 1 PID: 4247 Comm: kworker/u4:6 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
Workqueue: phy17 ieee80211_csa_finalize_work
RIP: 0010:ieee80211_mesh_build_beacon+0x10a/0x1bf0 net/mac80211/mesh.c:826
Code: 0c bd 01 f8 89 c5 31 ff 89 c6 e8 41 d2 16 f8 85 ed 0f 84 9c 00 00 00 e8 d4 ce 16 f8 eb 05 e8 cd ce 16 f8 4c 89 f0 48 c1 e8 03 <80> 3c 18 00 74 08 4c 89 f7 e8 88 fc 5b f8 4c 89 7c 24 48 4d 8b 36
RSP: 0018:ffffc9000320faa0 EFLAGS: 00010246
RAX: 0000000000000000 RBX: dffffc0000000000 RCX: ffff888028c39dc0
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: 0000000000000001 R08: dffffc0000000000 R09: 1ffffffff203de18
R10: dffffc0000000000 R11: fffffbfff203de19 R12: dffffc0000000000
R13: ffff8880612c9a08 R14: 0000000000000000 R15: ffff8880612ca528
FS:  0000000000000000(0000) GS:ffff8880b9100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f2bfa8f84c0 CR3: 00000000735f7000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 ieee80211_mesh_rebuild_beacon+0x8a/0x130 net/mac80211/mesh.c:1000
 ieee80211_mesh_finish_csa+0xe6/0x1a0 net/mac80211/mesh.c:1390
 ieee80211_set_after_csa_beacon net/mac80211/cfg.c:3196 [inline]
 __ieee80211_csa_finalize net/mac80211/cfg.c:3245 [inline]
 ieee80211_csa_finalize+0x4a5/0xb20 net/mac80211/cfg.c:3268
 ieee80211_csa_finalize_work+0xf2/0x130 net/mac80211/cfg.c:3293
 process_one_work+0x867/0xff0 kernel/workqueue.c:2310
 worker_thread+0xad7/0x12a0 kernel/workqueue.c:2457
 kthread+0x42e/0x520 kernel/kthread.c:334
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
 </TASK>
Modules linked in:
---[ end trace cf8ec8b4eec7b912 ]---
RIP: 0010:ieee80211_mesh_build_beacon+0x10a/0x1bf0 net/mac80211/mesh.c:826
Code: 0c bd 01 f8 89 c5 31 ff 89 c6 e8 41 d2 16 f8 85 ed 0f 84 9c 00 00 00 e8 d4 ce 16 f8 eb 05 e8 cd ce 16 f8 4c 89 f0 48 c1 e8 03 <80> 3c 18 00 74 08 4c 89 f7 e8 88 fc 5b f8 4c 89 7c 24 48 4d 8b 36
RSP: 0018:ffffc9000320faa0 EFLAGS: 00010246
RAX: 0000000000000000 RBX: dffffc0000000000 RCX: ffff888028c39dc0
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: 0000000000000001 R08: dffffc0000000000 R09: 1ffffffff203de18
R10: dffffc0000000000 R11: fffffbfff203de19 R12: dffffc0000000000
R13: ffff8880612c9a08 R14: 0000000000000000 R15: ffff8880612ca528
FS:  0000000000000000(0000) GS:ffff8880b9100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f2bfa8f84c0 CR3: 00000000735f7000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	0c bd                	or     $0xbd,%al
   2:	01 f8                	add    %edi,%eax
   4:	89 c5                	mov    %eax,%ebp
   6:	31 ff                	xor    %edi,%edi
   8:	89 c6                	mov    %eax,%esi
   a:	e8 41 d2 16 f8       	call   0xf816d250
   f:	85 ed                	test   %ebp,%ebp
  11:	0f 84 9c 00 00 00    	je     0xb3
  17:	e8 d4 ce 16 f8       	call   0xf816cef0
  1c:	eb 05                	jmp    0x23
  1e:	e8 cd ce 16 f8       	call   0xf816cef0
  23:	4c 89 f0             	mov    %r14,%rax
  26:	48 c1 e8 03          	shr    $0x3,%rax
* 2a:	80 3c 18 00          	cmpb   $0x0,(%rax,%rbx,1) <-- trapping instruction
  2e:	74 08                	je     0x38
  30:	4c 89 f7             	mov    %r14,%rdi
  33:	e8 88 fc 5b f8       	call   0xf85bfcc0
  38:	4c 89 7c 24 48       	mov    %r15,0x48(%rsp)
  3d:	4d 8b 36             	mov    (%r14),%r14