------------[ cut here ]------------
WARNING: CPU: 1 PID: 4308 at mm/maccess.c:226 copy_from_user_nofault+0x160/0x1c0 mm/maccess.c:226
Modules linked in:
CPU: 1 PID: 4308 Comm: kworker/u4:6 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
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 8d f6 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 10 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:ffffc90000dcfa68 EFLAGS: 00010246
RAX: ffffffff819ed900 RBX: 0000000000000008 RCX: ffff88801dde8000
RDX: 0000000000000100 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: dffffc0000000000 R09: fffffbfff1ff7c19
R10: fffffbfff1ff7c19 R11: 1ffffffff1ff7c18 R12: ffff88801dde9788
R13: 1ffff920001b9f5c R14: ffffc90000dcfac8 R15: 0000000000002000
FS:  0000000000000000(0000) GS:ffff8880b9100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000002000 CR3: 0000000024ce6000 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_user kernel/trace/bpf_trace.c:166 [inline]
 bpf_probe_read_user+0x26/0x70 kernel/trace/bpf_trace.c:163
 bpf_prog_56309f0d1bad794d+0x38/0x554
 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_run3+0x17e/0x320 kernel/trace/bpf_trace.c:1916
 __bpf_trace_kmem_cache_free+0x99/0xc0 include/trace/events/kmem.h:138
 trace_kmem_cache_free include/trace/events/kmem.h:138 [inline]
 kmem_cache_free+0x1e7/0x210 mm/slub.c:3521
 tcp_clean_rtx_queue net/ipv4/tcp_input.c:3407 [inline]
 tcp_ack+0x2086/0x6260 net/ipv4/tcp_input.c:3964
 tcp_rcv_established+0xea6/0x1cb0 net/ipv4/tcp_input.c:5981
 tcp_v4_do_rcv+0x44b/0x9b0 net/ipv4/tcp_ipv4.c:1731
 tcp_v4_rcv+0x268f/0x2cb0 net/ipv4/tcp_ipv4.c:2143
 ip_protocol_deliver_rcu+0x3ad/0x770 net/ipv4/ip_input.c:204
 ip_local_deliver_finish+0x1d5/0x320 net/ipv4/ip_input.c:231
 NF_HOOK+0x2d6/0x360 include/linux/netfilter.h:302
 dst_input include/net/dst.h:462 [inline]
 ip_sublist_rcv_finish net/ipv4/ip_input.c:577 [inline]
 ip_list_rcv_finish net/ipv4/ip_input.c:628 [inline]
 ip_sublist_rcv+0xa1f/0xce0 net/ipv4/ip_input.c:636
 ip_list_rcv+0x3df/0x430 net/ipv4/ip_input.c:671
 __netif_receive_skb_list_ptype net/core/dev.c:5568 [inline]
 __netif_receive_skb_list_core+0x574/0x740 net/core/dev.c:5616
 __netif_receive_skb_list net/core/dev.c:5668 [inline]
 netif_receive_skb_list_internal+0x871/0xb90 net/core/dev.c:5759
 gro_normal_list net/core/dev.c:5913 [inline]
 napi_complete_done+0x37d/0x830 net/core/dev.c:6651
 virtqueue_napi_complete drivers/net/virtio_net.c:357 [inline]
 virtnet_poll+0x912/0xef0 drivers/net/virtio_net.c:1624
 __napi_poll+0xc0/0x430 net/core/dev.c:7075
 napi_poll net/core/dev.c:7142 [inline]
 net_rx_action+0x4a8/0x9c0 net/core/dev.c:7232
 handle_softirqs+0x328/0x820 kernel/softirq.c:576
 __do_softirq kernel/softirq.c:610 [inline]
 invoke_softirq kernel/softirq.c:450 [inline]
 __irq_exit_rcu+0x12f/0x220 kernel/softirq.c:659
 irq_exit_rcu+0x5/0x20 kernel/softirq.c:671
 common_interrupt+0xb5/0xd0 arch/x86/kernel/irq.c:242
 </IRQ>
 <TASK>
 asm_common_interrupt+0x22/0x40 arch/x86/include/asm/idtentry.h:667
RIP: 0010:check_kcov_mode kernel/kcov.c:172 [inline]
RIP: 0010:__sanitizer_cov_trace_pc+0x13/0x60 kernel/kcov.c:206
Code: 48 8b 3d 50 d3 f1 0b 48 89 de 5b e9 57 9e 43 00 00 00 cc cc 00 00 cc 48 8b 04 24 65 48 8b 0d a4 a3 8a 7e 65 8b 15 a5 a3 8a 7e <81> e2 00 01 ff 00 74 11 81 fa 00 01 00 00 75 35 83 b9 34 16 00 00
RSP: 0018:ffffc9000346fbd8 EFLAGS: 00000202
RAX: ffffffff897e9c65 RBX: dffffc0000000000 RCX: ffff88801dde8000
RDX: 0000000080000000 RSI: ffffffff8a59e560 RDI: ffffffff8a59e520
RBP: 0000000000000001 R08: dffffc0000000000 R09: fffffbfff1ff7c19
R10: fffffbfff1ff7c19 R11: 1ffffffff1ff7c18 R12: 0000000000000049
R13: fffffffffffffe38 R14: ffff888077528c80 R15: ffff88802ae4a490
 rcu_read_unlock include/linux/rcupdate.h:769 [inline]
 batadv_nc_purge_orig_hash net/batman-adv/network-coding.c:416 [inline]
 batadv_nc_worker+0x1e5/0x5c0 net/batman-adv/network-coding.c:723
 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):
   0:	48 8b 3d 50 d3 f1 0b 	mov    0xbf1d350(%rip),%rdi        # 0xbf1d357
   7:	48 89 de             	mov    %rbx,%rsi
   a:	5b                   	pop    %rbx
   b:	e9 57 9e 43 00       	jmp    0x439e67
  10:	00 00                	add    %al,(%rax)
  12:	cc                   	int3
  13:	cc                   	int3
  14:	00 00                	add    %al,(%rax)
  16:	cc                   	int3
  17:	48 8b 04 24          	mov    (%rsp),%rax
  1b:	65 48 8b 0d a4 a3 8a 	mov    %gs:0x7e8aa3a4(%rip),%rcx        # 0x7e8aa3c7
  22:	7e
  23:	65 8b 15 a5 a3 8a 7e 	mov    %gs:0x7e8aa3a5(%rip),%edx        # 0x7e8aa3cf
* 2a:	81 e2 00 01 ff 00    	and    $0xff0100,%edx <-- trapping instruction
  30:	74 11                	je     0x43
  32:	81 fa 00 01 00 00    	cmp    $0x100,%edx
  38:	75 35                	jne    0x6f
  3a:	83                   	.byte 0x83
  3b:	b9 34 16 00 00       	mov    $0x1634,%ecx