------------[ cut here ]------------
NETDEV WATCHDOG: lec0 (): transmit queue 0 timed out
WARNING: CPU: 1 PID: 5113 at net/sched/sch_generic.c:481 dev_watchdog+0x85d/0xa40 net/sched/sch_generic.c:480
Modules linked in:
CPU: 1 PID: 5113 Comm: kworker/u4:7 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/07/2026
Workqueue: writeback wb_workfn (flush-7:1)
RIP: 0010:dev_watchdog+0x85d/0xa40 net/sched/sch_generic.c:480
Code: 8d 51 06 01 48 8b 5c 24 20 48 89 df e8 6c cb e3 ff 48 c7 c7 40 5e 22 8b 48 89 de 48 8b 1c 24 48 89 c2 44 89 e1 e8 33 46 b1 01 <0f> 0b e9 51 fe ff ff e8 b7 3f 73 f9 0f 0b e9 33 fe ff ff 89 d9 80
RSP: 0018:ffffc90000dd0af0 EFLAGS: 00010246
RAX: cb324142febb5800 RBX: ffff88805a404448 RCX: ffff88801bbcd940
RDX: 0000000000000100 RSI: 0000000000000101 RDI: 0000000000000000
RBP: dffffc0000000000 R08: ffffc90000dd0627 R09: 1ffff920001ba0c4
R10: dffffc0000000000 R11: fffff520001ba0c5 R12: 0000000000000000
R13: ffff88805a404540 R14: 0000000000000000 R15: dffffc0000000000
FS:  0000000000000000(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000555581a039f8 CR3: 00000000685c2000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 call_timer_fn+0x17b/0x540 kernel/time/timer.c:1648
 expire_timers kernel/time/timer.c:1699 [inline]
 __run_timers+0x56c/0x810 kernel/time/timer.c:1970
 run_timer_softirq+0x63/0xf0 kernel/time/timer.c:1983
 handle_softirqs+0x336/0x830 kernel/softirq.c:576
 __do_softirq kernel/softirq.c:610 [inline]
 invoke_softirq kernel/softirq.c:450 [inline]
 __irq_exit_rcu+0x13b/0x230 kernel/softirq.c:659
 irq_exit_rcu+0x5/0x20 kernel/softirq.c:671
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1108 [inline]
 sysvec_apic_timer_interrupt+0xa0/0xc0 arch/x86/kernel/apic/apic.c:1108
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:676
RIP: 0010:stack_trace_consume_entry+0x12a/0x270 kernel/stacktrace.c:95
Code: 56 00 49 89 e8 4c 89 e2 48 89 de 49 89 37 41 8b 18 41 0f b6 44 15 00 84 c0 0f 85 2f 01 00 00 41 3b 1e 0f 92 c0 48 83 c4 18 5b <41> 5c 41 5d 41 5e 41 5f 5d c3 44 89 c1 80 e1 07 80 c1 03 38 c1 0f
RSP: 0018:ffffc9000345ead8 EFLAGS: 00000292
RAX: 0000000000000001 RBX: ffffc9000345ebc0 RCX: 0000000080000001
RDX: dffffc0000000000 RSI: ffffffff83895fd1 RDI: ffffc9000345ebc0
RBP: 1ffff9200068bd7a R08: ffffc9000345ebd0 R09: 0000000000000004
R10: dffffc0000000000 R11: fffff5200068bd6d R12: 0000000000000000
R13: 1ffff9200068bd79 R14: ffffc9000345ebc8 R15: ffffc9000345ec70
 arch_stack_walk+0x100/0x140 arch/x86/kernel/stacktrace.c:27
 stack_trace_save+0xa6/0xf0 kernel/stacktrace.c:122
 kasan_save_stack mm/kasan/common.c:38 [inline]
 kasan_set_track mm/kasan/common.c:46 [inline]
 set_alloc_info mm/kasan/common.c:434 [inline]
 __kasan_slab_alloc+0x92/0xc0 mm/kasan/common.c:467
 kasan_slab_alloc include/linux/kasan.h:254 [inline]
 slab_post_alloc_hook+0x4c/0x380 mm/slab.h:519
 slab_alloc_node mm/slub.c:3225 [inline]
 slab_alloc mm/slub.c:3233 [inline]
 kmem_cache_alloc+0x15d/0x280 mm/slub.c:3238
 f2fs_kmem_cache_alloc_nofail fs/f2fs/f2fs.h:2631 [inline]
 f2fs_kmem_cache_alloc fs/f2fs/f2fs.h:2641 [inline]
 add_free_nid+0xd3/0x670 fs/f2fs/node.c:2307
 scan_free_nid_bits fs/f2fs/node.c:2458 [inline]
 __f2fs_build_free_nids fs/f2fs/node.c:2492 [inline]
 f2fs_build_free_nids+0x591/0x1240 fs/f2fs/node.c:2550
 f2fs_balance_fs_bg+0x13c/0x740 fs/f2fs/segment.c:557
 f2fs_write_node_pages+0x155/0x6c0 fs/f2fs/node.c:2126
 do_writepages+0x493/0x700 mm/page-writeback.c:2386
 __writeback_single_inode+0x153/0xda0 fs/fs-writeback.c:1657
 writeback_sb_inodes+0xaaa/0x1750 fs/fs-writeback.c:1940
 wb_writeback+0x44a/0xbc0 fs/fs-writeback.c:2114
 wb_do_writeback fs/fs-writeback.c:2257 [inline]
 wb_workfn+0x43a/0xf20 fs/fs-writeback.c:2298
 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>
----------------
Code disassembly (best guess):
   0:	56                   	push   %rsi
   1:	00 49 89             	add    %cl,-0x77(%rcx)
   4:	e8 4c 89 e2 48       	call   0x48e28955
   9:	89 de                	mov    %ebx,%esi
   b:	49 89 37             	mov    %rsi,(%r15)
   e:	41 8b 18             	mov    (%r8),%ebx
  11:	41 0f b6 44 15 00    	movzbl 0x0(%r13,%rdx,1),%eax
  17:	84 c0                	test   %al,%al
  19:	0f 85 2f 01 00 00    	jne    0x14e
  1f:	41 3b 1e             	cmp    (%r14),%ebx
  22:	0f 92 c0             	setb   %al
  25:	48 83 c4 18          	add    $0x18,%rsp
  29:	5b                   	pop    %rbx
* 2a:	41 5c                	pop    %r12 <-- trapping instruction
  2c:	41 5d                	pop    %r13
  2e:	41 5e                	pop    %r14
  30:	41 5f                	pop    %r15
  32:	5d                   	pop    %rbp
  33:	c3                   	ret
  34:	44 89 c1             	mov    %r8d,%ecx
  37:	80 e1 07             	and    $0x7,%cl
  3a:	80 c1 03             	add    $0x3,%cl
  3d:	38 c1                	cmp    %al,%cl
  3f:	0f                   	.byte 0xf