------------[ cut here ]------------
WARNING: CPU: 1 PID: 5674 at mm/maccess.c:226 copy_from_user_nofault+0x160/0x1c0 mm/maccess.c:226
Modules linked in:
CPU: 1 PID: 5674 Comm: kworker/u4:19 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/06/2026
Workqueue: bat_events batadv_nc_worker
RIP: 0010:copy_from_user_nofault+0x160/0x1c0 mm/maccess.c:226
Code: 24 45 31 f6 31 ff 89 de e8 7d 7a d8 ff 85 db 48 c7 c0 f2 ff ff ff 49 0f 44 c6 5b 41 5c 41 5d 41 5e 41 5f 5d c3 e8 00 77 d8 ff <0f> 0b e9 1c ff ff ff 44 89 e1 80 e1 07 80 c1 03 38 c1 0f 8c ea fe
RSP: 0018:ffffc90000dcfde8 EFLAGS: 00010246
RAX: ffffffff81a0b690 RBX: 0000000000000000 RCX: ffff888018fc1dc0
RDX: 0000000000000100 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: ffffc90000dd0217 R09: ffffc90000dd01e4
R10: dffffc0000000000 R11: fffff520001ba043 R12: ffff888018fc3568
R13: ffffc900010be030 R14: ffffc90000dcfe48 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f67dfa69080 CR3: 000000008398b000 CR4: 00000000003506e0
DR0: 0000200000000580 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 bpf_probe_read_user_common kernel/trace/bpf_trace.c:157 [inline]
 ____bpf_probe_read_user kernel/trace/bpf_trace.c:166 [inline]
 bpf_probe_read_user+0x26/0x70 kernel/trace/bpf_trace.c:163
 bpf_prog_f2594087b0f175cc+0x32/0xc70
 bpf_dispatcher_nop_func include/linux/bpf.h:890 [inline]
 __bpf_prog_run include/linux/filter.h:628 [inline]
 bpf_prog_run include/linux/filter.h:635 [inline]
 bpf_prog_run_pin_on_cpu include/linux/filter.h:652 [inline]
 bpf_flow_dissect+0x128/0x400 net/core/flow_dissector.c:896
 __skb_flow_dissect+0x7dc/0x61d0 net/core/flow_dissector.c:1032
 __skb_get_hash_net+0xda/0x4d0 net/core/flow_dissector.c:1713
 skb_get_hash include/linux/skbuff.h:1440 [inline]
 skb_tx_hash net/core/dev.c:3256 [inline]
 netdev_pick_tx+0x337/0xad0 net/core/dev.c:4154
 netdev_core_pick_tx+0x141/0x300 net/core/dev.c:4187
 __dev_queue_xmit+0x797/0x2e50 net/core/dev.c:4262
 NF_HOOK+0x2fe/0x380 include/linux/netfilter.h:302
 arp_xmit+0x142/0x230 net/ipv4/arp.c:643
 arp_solicit+0xba5/0xde0 net/ipv4/arp.c:391
 neigh_probe net/core/neighbour.c:1017 [inline]
 neigh_timer_handler+0xaa9/0xff0 net/core/neighbour.c:1099
 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:strlen+0x3f/0x60 lib/string.c:581
Code: fc ff df 48 89 fb 49 89 c7 48 89 d8 48 c1 e8 03 42 0f b6 04 30 84 c0 75 11 48 ff c3 49 8d 47 01 42 80 7c 3f 01 00 75 de eb 19 <89> d9 80 e1 07 38 c1 7c e6 49 89 fc 48 89 df e8 2d 16 b2 fd 4c 89
RSP: 0018:ffffc90003cf7958 EFLAGS: 00000206
RAX: 0000000000000006 RBX: ffffffff8a2c304c RCX: 000000008a2c3003
RDX: 0000000000000000 RSI: ffffffff8d11efa0 RDI: ffffffff8a2c3040
RBP: ffffc90003cf7a80 R08: 0000000000000002 R09: 0000000000000000
R10: dffffc0000000000 R11: fffffbfff1cda646 R12: 1ffff9200079ef60
R13: 1ffff9200079ef38 R14: dffffc0000000000 R15: 000000000000000b
 trace_event_get_offsets_lock_acquire include/trace/events/lock.h:23 [inline]
 perf_trace_lock_acquire+0xc6/0x3f0 include/trace/events/lock.h:13
 trace_lock_acquire include/trace/events/lock.h:13 [inline]
 lock_acquire+0x3d7/0x400 kernel/locking/lockdep.c:5708
 rcu_lock_acquire+0x2a/0x30 include/linux/rcupdate.h:313
 rcu_read_lock include/linux/rcupdate.h:740 [inline]
 batadv_nc_purge_orig_hash net/batman-adv/network-coding.c:412 [inline]
 batadv_nc_worker+0xc9/0x5c0 net/batman-adv/network-coding.c:723
 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:	fc                   	cld
   1:	ff                   	lcall  (bad)
   2:	df 48 89             	fisttps -0x77(%rax)
   5:	fb                   	sti
   6:	49 89 c7             	mov    %rax,%r15
   9:	48 89 d8             	mov    %rbx,%rax
   c:	48 c1 e8 03          	shr    $0x3,%rax
  10:	42 0f b6 04 30       	movzbl (%rax,%r14,1),%eax
  15:	84 c0                	test   %al,%al
  17:	75 11                	jne    0x2a
  19:	48 ff c3             	inc    %rbx
  1c:	49 8d 47 01          	lea    0x1(%r15),%rax
  20:	42 80 7c 3f 01 00    	cmpb   $0x0,0x1(%rdi,%r15,1)
  26:	75 de                	jne    0x6
  28:	eb 19                	jmp    0x43
* 2a:	89 d9                	mov    %ebx,%ecx <-- trapping instruction
  2c:	80 e1 07             	and    $0x7,%cl
  2f:	38 c1                	cmp    %al,%cl
  31:	7c e6                	jl     0x19
  33:	49 89 fc             	mov    %rdi,%r12
  36:	48 89 df             	mov    %rbx,%rdi
  39:	e8 2d 16 b2 fd       	call   0xfdb2166b
  3e:	4c                   	rex.WR
  3f:	89                   	.byte 0x89