------------[ cut here ]------------
WARNING: CPU: 0 PID: 24718 at mm/maccess.c:226 copy_from_user_nofault+0x160/0x1c0 mm/maccess.c:226
Modules linked in:
CPU: 0 PID: 24718 Comm: syz.6.7051 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
RIP: 0010:copy_from_user_nofault+0x160/0x1c0 mm/maccess.c:226
Code: 24 45 31 f6 31 ff 89 de e8 4d 97 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 d0 93 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:ffffc90000006d08 EFLAGS: 00010246
RAX: ffffffff81a068e0 RBX: 0000000000000000 RCX: ffff888026619dc0
RDX: 0000000000000100 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: ffffc90000007137 R09: ffffc90000007104
R10: dffffc0000000000 R11: fffff52000000e27 R12: ffff88802661b548
R13: ffffc90000d22030 R14: ffffc90000006d68 R15: 0000000000000000
FS: 00007fed90b746c0(0000) GS:ffff8880b9000000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00002000000003c0 CR3: 0000000066600000 CR4: 00000000003506f0
DR0: 0000200000000300 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 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_f2594087b0f175cc+0x32/0xecc
bpf_dispatcher_nop_func include/linux/bpf.h:889 [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+0x12b/0x3e0 net/core/flow_dissector.c:896
__skb_flow_dissect+0x7cc/0x6180 net/core/flow_dissector.c:1029
__skb_get_hash_symmetric+0xef/0x3b0 net/core/flow_dissector.c:1680
fanout_demux_hash net/packet/af_packet.c:1382 [inline]
packet_rcv_fanout+0x214/0x620 net/packet/af_packet.c:1497
dev_queue_xmit_nit+0xa48/0xae0 net/core/dev.c:2386
xmit_one net/core/dev.c:3657 [inline]
dev_hard_start_xmit+0x140/0x7d0 net/core/dev.c:3678
__dev_queue_xmit+0x195d/0x2e50 net/core/dev.c:4305
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
asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:676
RIP: 0010:finish_lock_switch+0x12f/0x290 kernel/sched/core.c:4804
Code: 83 c7 18 be ff ff ff ff e8 6e cb 6b 08 85 c0 74 46 4d 85 ff 75 62 0f 1f 44 00 00 48 89 df e8 98 3a 75 08 e8 43 d7 2a 00 fb 5b <41> 5c 41 5d 41 5e 41 5f 5d c3 48 89 df e8 2f 0e fe ff 43 80 3c 2c
RSP: 0018:ffffc90002f6f778 EFLAGS: 00000282
RAX: c04e5768740a8e00 RBX: ffff88805471bb80 RCX: c04e5768740a8e00
RDX: dffffc0000000000 RSI: ffffffff8a2b2be0 RDI: ffffffff8a7a4200
RBP: 1ffff11017207613 R08: ffff8880b903a343 R09: 1ffff11017207468
R10: dffffc0000000000 R11: ffffed1017207469 R12: 1ffff110172075c1
R13: dffffc0000000000 R14: ffff8880b903ae08 R15: 0000000000000000
finish_task_switch+0x12f/0x650 kernel/sched/core.c:4921
context_switch kernel/sched/core.c:5052 [inline]
__schedule+0x11cb/0x4350 kernel/sched/core.c:6395
preempt_schedule_common+0x82/0xd0 kernel/sched/core.c:6571
preempt_schedule+0xbc/0xd0 kernel/sched/core.c:6596
preempt_schedule_thunk+0x16/0x18 arch/x86/entry/thunk_64.S:34
try_to_wake_up+0x6cc/0x1020 kernel/sched/core.c:4171
wake_up_process kernel/sched/core.c:4234 [inline]
wake_up_q+0x78/0xc0 kernel/sched/core.c:953
futex_wake+0x4a9/0x540 kernel/futex/core.c:1702
do_futex+0xd83/0x12b0 kernel/futex/core.c:3988
__do_sys_futex kernel/futex/core.c:4060 [inline]
__se_sys_futex+0x389/0x420 kernel/futex/core.c:4041
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: 0033:0x7fed9291c0d9
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fed90b740e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: ffffffffffffffda RBX: 00007fed92ba3fa8 RCX: 00007fed9291c0d9
RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 00007fed92ba3fac
RBP: 00007fed92ba3fa0 R08: 0034a1d06c593bd8 R09: 0000000000000000
R10: ffffffffffffffff R11: 0000000000000246 R12: 0000000000000000
R13: 00007fed92ba4038 R14: 00007ffff6d18da0 R15: 00007ffff6d18e88
----------------
Code disassembly (best guess):
0: 83 c7 18 add $0x18,%edi
3: be ff ff ff ff mov $0xffffffff,%esi
8: e8 6e cb 6b 08 call 0x86bcb7b
d: 85 c0 test %eax,%eax
f: 74 46 je 0x57
11: 4d 85 ff test %r15,%r15
14: 75 62 jne 0x78
16: 0f 1f 44 00 00 nopl 0x0(%rax,%rax,1)
1b: 48 89 df mov %rbx,%rdi
1e: e8 98 3a 75 08 call 0x8753abb
23: e8 43 d7 2a 00 call 0x2ad76b
28: fb sti
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: 48 89 df mov %rbx,%rdi
37: e8 2f 0e fe ff call 0xfffe0e6b
3c: 43 rex.XB
3d: 80 .byte 0x80
3e: 3c 2c cmp $0x2c,%al