------------[ cut here ]------------
WARNING: CPU: 0 PID: 4857 at mm/maccess.c:226 copy_from_user_nofault+0x160/0x1c0 mm/maccess.c:226
Modules linked in:
CPU: 0 PID: 4857 Comm: syz.2.212 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
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:ffffc90000007740 EFLAGS: 00010246
RAX: ffffffff819ed900 RBX: 0000000000000008 RCX: ffff8880213f8000
RDX: 0000000000000100 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: dffffc0000000000 R09: fffffbfff1ff7c19
R10: fffffbfff1ff7c19 R11: 1ffffffff1ff7c18 R12: ffff8880213f9788
R13: 1ffff92000000ef8 R14: ffffc900000077a8 R15: 0000000000000000
FS: 00005555793e1500(0000) GS:ffff8880b9000000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c338158 CR3: 0000000060ca5000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600
Call Trace:
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_02073d59a3c0f06f+0x3d/0x3b8
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
trace_kfree_skb+0x170/0x1d0 include/trace/events/skb.h:44
kfree_skb_reason net/core/skbuff.c:775 [inline]
kfree_skb include/linux/skbuff.h:1118 [inline]
kfree_skb_list+0x8c/0x140 net/core/skbuff.c:785
__dev_xmit_skb net/core/dev.c:3948 [inline]
__dev_queue_xmit+0x1fcb/0x2ed0 net/core/dev.c:4253
lapb_data_transmit+0x86/0xa0 net/lapb/lapb_iface.c:447
lapb_transmit_buffer+0x15f/0x1f0 net/lapb/lapb_out.c:149
lapb_t1timer_expiry+0x652/0xa70 net/lapb/lapb_timer.c:-1
call_timer_fn+0x16c/0x530 kernel/time/timer.c:1451
expire_timers kernel/time/timer.c:1496 [inline]
__run_timers+0x525/0x7c0 kernel/time/timer.c:1767
run_timer_softirq+0x63/0xf0 kernel/time/timer.c:1780
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
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
asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:676
RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:161 [inline]
RIP: 0010:_raw_spin_unlock_irqrestore+0xa5/0x100 kernel/locking/spinlock.c:194
Code: 74 05 e8 de 0d cb f7 48 c7 44 24 20 00 00 00 00 9c 8f 44 24 20 f6 44 24 21 02 75 4b f7 c3 00 02 00 00 74 01 fb bf 01 00 00 00 f6 95 9e f7 65 8b 05 87 93 4f 76 85 c0 74 3c 48 c7 04 24 0e 36
RSP: 0018:ffffc9000307fa60 EFLAGS: 00000206
RAX: e3e3d61f6f7f8f00 RBX: 0000000000000a02 RCX: e3e3d61f6f7f8f00
RDX: dffffc0000000000 RSI: ffffffff8a0b1c60 RDI: 0000000000000001
RBP: ffffc9000307fae0 R08: dffffc0000000000 R09: ffffed1004d7e8b3
R10: ffffed1004d7e8b3 R11: 1ffff11004d7e8b2 R12: dffffc0000000000
R13: ffff888026bf3b80 R14: ffff888026bf4590 R15: 1ffff9200060ff4c
try_to_wake_up+0x69d/0x1050 kernel/sched/core.c:4167
wake_up_process kernel/sched/core.c:4234 [inline]
wake_up_q+0x78/0xc0 kernel/sched/core.c:953
futex_wake+0x49f/0x530 kernel/futex/core.c:1702
do_futex+0xcde/0x1240 kernel/futex/core.c:3987
__do_sys_futex kernel/futex/core.c:4059 [inline]
__se_sys_futex+0x3a3/0x430 kernel/futex/core.c:4040
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f992a016749
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffe5294f898 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: ffffffffffffffda RBX: 00007f992a26cfa8 RCX: 00007f992a016749
RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 00007f992a26cfa8
RBP: 0000000000000000 R08: 0000000000000020 R09: 0000000a5294fb8f
R10: 00007f992a26cfa0 R11: 0000000000000246 R12: 00007f992a26cfac
R13: 00007f992a26cfa0 R14: 0000000000000095 R15: 0000000000000003
----------------
Code disassembly (best guess):
0: 74 05 je 0x7
2: e8 de 0d cb f7 call 0xf7cb0de5
7: 48 c7 44 24 20 00 00 movq $0x0,0x20(%rsp)
e: 00 00
10: 9c pushf
11: 8f 44 24 20 pop 0x20(%rsp)
15: f6 44 24 21 02 testb $0x2,0x21(%rsp)
1a: 75 4b jne 0x67
1c: f7 c3 00 02 00 00 test $0x200,%ebx
22: 74 01 je 0x25
24: fb sti
25: bf 01 00 00 00 mov $0x1,%edi
* 2a: e8 f6 95 9e f7 call 0xf79e9625 <-- trapping instruction
2f: 65 8b 05 87 93 4f 76 mov %gs:0x764f9387(%rip),%eax # 0x764f93bd
36: 85 c0 test %eax,%eax
38: 74 3c je 0x76
3a: 48 rex.W
3b: c7 .byte 0xc7
3c: 04 24 add $0x24,%al
3e: 0e (bad)
3f: 36 ss