------------[ cut here ]------------
WARNING: CPU: 1 PID: 4379 at mm/maccess.c:226 copy_from_user_nofault+0x160/0x1c0 mm/maccess.c:226
Modules linked in:
CPU: 1 PID: 4379 Comm: kworker/u4:7 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
Workqueue: bat_events batadv_iv_send_outstanding_bat_ogm_packet
RIP: 0010:copy_from_user_nofault+0x160/0x1c0 mm/maccess.c:226
Code: 24 45 31 f6 31 ff 89 de e8 6d f7 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 f0 f3 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:ffffc90000dd0c50 EFLAGS: 00010006
RAX: ffffffff819ed660 RBX: 0000000000000008 RCX: ffff88807b458000
RDX: 0000000000010000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: dffffc0000000000 R09: ffffed100f68b001
R10: ffffed100f68b001 R11: 1ffff1100f68b000 R12: ffff88807b459788
R13: 00007ffffffff000 R14: ffffc90000dd0cc8 R15: 0000000020000000
FS:  0000000000000000(0000) GS:ffff8880b9100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020000000 CR3: 000000000be8e000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 bpf_probe_read_user_common kernel/trace/bpf_trace.c:157 [inline]
 ____bpf_probe_read_compat kernel/trace/bpf_trace.c:281 [inline]
 bpf_probe_read_compat+0xdd/0x170 kernel/trace/bpf_trace.c:277
 bpf_prog_bcff4640d6a7c5a9+0x5e/0x774
 bpf_dispatcher_nop_func include/linux/bpf.h:888 [inline]
 __bpf_prog_run include/linux/filter.h:628 [inline]
 bpf_prog_run include/linux/filter.h:635 [inline]
 __bpf_trace_run kernel/trace/bpf_trace.c:1878 [inline]
 bpf_trace_run2+0x15b/0x2d0 kernel/trace/bpf_trace.c:1915
 trace_tlb_flush+0xe6/0x110 include/trace/events/tlb.h:38
 switch_mm_irqs_off+0x6e3/0x9a0 arch/x86/mm/tlb.c:-1
 flush_tlb_func+0x1bc/0x510 arch/x86/mm/tlb.c:773
 flush_smp_call_function_queue+0x2a9/0x760 kernel/smp.c:628
 __sysvec_call_function_single+0x98/0x240 arch/x86/kernel/smp.c:248
 instr_sysvec_call_function_single arch/x86/kernel/smp.c:243 [inline]
 sysvec_call_function_single+0x98/0xc0 arch/x86/kernel/smp.c:243
 </IRQ>
 <TASK>
 asm_sysvec_call_function_single+0x16/0x20 arch/x86/include/asm/idtentry.h:684
RIP: 0010:__orc_find arch/x86/kernel/unwind_orc.c:49 [inline]
RIP: 0010:orc_find arch/x86/kernel/unwind_orc.c:178 [inline]
RIP: 0010:unwind_next_frame+0x107f/0x1d90 arch/x86/kernel/unwind_orc.c:448
Code: 00 00 fc ff df 0f b6 04 08 84 c0 75 27 49 63 06 4c 01 f0 49 8d 4e 04 48 39 e8 4c 0f 46 e9 49 8d 46 fc 4c 0f 47 e0 4d 0f 46 fe <4d> 39 e5 76 a8 e9 be f1 ff ff 44 89 f1 80 e1 07 80 c1 03 38 c1 7c
RSP: 0018:ffffc900012ff628 EFLAGS: 00000297
RAX: ffffffff8d747fa4 RBX: ffffc900012ff6e8 RCX: ffffffff8d747fac
RDX: ffffffff8d747fa4 RSI: ffffffff8dde76d8 RDI: ffffffff8134790c
RBP: ffffffff8100460e R08: 0000000000000007 R09: 0000000000000008
R10: fffff5200025fee9 R11: 1ffff9200025fee7 R12: ffffffff8d747fac
R13: ffffffff8d747fac R14: ffffffff8d747fa8 R15: ffffffff8d747fa8
 arch_stack_walk+0x10c/0x140 arch/x86/kernel/stacktrace.c:25
 stack_trace_save+0x98/0xe0 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_kmalloc mm/kasan/common.c:513 [inline]
 __kasan_kmalloc+0xb5/0xf0 mm/kasan/common.c:522
 kmalloc_reserve net/core/skbuff.c:356 [inline]
 pskb_expand_head+0x127/0x10f0 net/core/skbuff.c:1709
 __skb_cow include/linux/skbuff.h:3406 [inline]
 skb_cow_head include/linux/skbuff.h:3440 [inline]
 batadv_skb_head_push+0x162/0x1f0 net/batman-adv/soft-interface.c:73
 batadv_send_skb_packet+0xf7/0x5f0 net/batman-adv/send.c:86
 batadv_iv_ogm_send_to_if net/batman-adv/bat_iv_ogm.c:392 [inline]
 batadv_iv_ogm_emit net/batman-adv/bat_iv_ogm.c:420 [inline]
 batadv_iv_send_outstanding_bat_ogm_packet+0x696/0x840 net/batman-adv/bat_iv_ogm.c:1700
 process_one_work+0x863/0x1000 kernel/workqueue.c:2310
 worker_thread+0xaa8/0x12a0 kernel/workqueue.c:2457
 kthread+0x436/0x520 kernel/kthread.c:334
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
 </TASK>
----------------
Code disassembly (best guess), 5 bytes skipped:
   0:	0f b6 04 08          	movzbl (%rax,%rcx,1),%eax
   4:	84 c0                	test   %al,%al
   6:	75 27                	jne    0x2f
   8:	49 63 06             	movslq (%r14),%rax
   b:	4c 01 f0             	add    %r14,%rax
   e:	49 8d 4e 04          	lea    0x4(%r14),%rcx
  12:	48 39 e8             	cmp    %rbp,%rax
  15:	4c 0f 46 e9          	cmovbe %rcx,%r13
  19:	49 8d 46 fc          	lea    -0x4(%r14),%rax
  1d:	4c 0f 47 e0          	cmova  %rax,%r12
  21:	4d 0f 46 fe          	cmovbe %r14,%r15
* 25:	4d 39 e5             	cmp    %r12,%r13 <-- trapping instruction
  28:	76 a8                	jbe    0xffffffd2
  2a:	e9 be f1 ff ff       	jmp    0xfffff1ed
  2f:	44 89 f1             	mov    %r14d,%ecx
  32:	80 e1 07             	and    $0x7,%cl
  35:	80 c1 03             	add    $0x3,%cl
  38:	38 c1                	cmp    %al,%cl
  3a:	7c                   	.byte 0x7c