------------[ cut here ]------------
WARNING: CPU: 1 PID: 29410 at mm/maccess.c:226 copy_from_user_nofault+0x160/0x1c0 mm/maccess.c:226
Modules linked in:
CPU: 1 PID: 29410 Comm: syz.4.8486 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:copy_from_user_nofault+0x160/0x1c0 mm/maccess.c:226
Code: 24 45 31 f6 31 ff 89 de e8 7d 94 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 91 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:ffffc90000dcfec8 EFLAGS: 00010246
RAX: ffffffff81a08ea0 RBX: 0000000000000000 RCX: ffff8880299b9dc0
RDX: 0000000000000100 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: ffffc90000dd02f7 R09: ffffc90000dd02c4
R10: dffffc0000000000 R11: fffff520001ba05f R12: ffff8880299bb548
R13: ffffc90001308030 R14: ffffc90000dcff28 R15: 0000000000000000
FS: 00007f45388356c0(0000) GS:ffff8880b9100000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2d223ffc CR3: 000000003c53b000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000200000000300 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+0x32/0x850
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_prog_run_pin_on_cpu include/linux/filter.h:652 [inline]
bpf_flow_dissect+0x12b/0x3f0 net/core/flow_dissector.c:896
__skb_flow_dissect+0x792/0x60b0 net/core/flow_dissector.c:1024
skb_flow_dissect_flow_keys include/linux/skbuff.h:1390 [inline]
___skb_get_hash+0x55/0x680 net/core/flow_dissector.c:1583
__skb_get_hash+0xd2/0x270 net/core/flow_dissector.c:1648
skb_get_hash include/linux/skbuff.h:1432 [inline]
skb_tx_hash net/core/dev.c:3243 [inline]
netdev_pick_tx+0x335/0xad0 net/core/dev.c:4140
netdev_core_pick_tx+0x12e/0x2e0 net/core/dev.c:4173
__dev_queue_xmit+0x756/0x2fd0 net/core/dev.c:4248
hsr_xmit net/hsr/hsr_forward.c:340 [inline]
hsr_forward_do net/hsr/hsr_forward.c:431 [inline]
hsr_forward_skb+0xfd2/0x1700 net/hsr/hsr_forward.c:584
send_hsr_supervision_frame+0x5f7/0xb80 net/hsr/hsr_device.c:349
hsr_announce+0x168/0x310 net/hsr/hsr_device.c:405
call_timer_fn+0x17b/0x540 kernel/time/timer.c:1451
expire_timers kernel/time/timer.c:1496 [inline]
__run_timers+0x53a/0x7f0 kernel/time/timer.c:1767
run_timer_softirq+0x63/0xf0 kernel/time/timer.c:1780
handle_softirqs+0x339/0x830 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:fib_sync_down_addr+0x226/0x3a0 net/ipv4/fib_semantics.c:1906
Code: 00 00 c7 44 24 04 00 00 00 00 4d 8d 66 30 4c 89 e0 48 c1 e8 03 42 80 3c 28 00 74 08 4c 89 e7 e8 c0 2b 45 f9 4d 39 3c 24 74 0a 95 27 00 f9 e9 a7 00 00 00 4d 8d 66 4c 4c 89 e0 48 c1 e8 03 42
RSP: 0018:ffffc9000318ec10 EFLAGS: 00000287
RAX: 1ffff1100c166346 RBX: 00000000381414ac RCX: 0000000000080000
RDX: ffffc90004e1a000 RSI: 000000000002f86b RDI: 000000000002f86c
RBP: 00000000000000fe R08: ffffffff8d89d8af R09: 1ffffffff1b13b15
R10: dffffc0000000000 R11: fffffbfff1b13b16 R12: ffff888060b31a30
R13: dffffc0000000000 R14: ffff888060b31a00 R15: ffff8880776c0000
fib_del_ifaddr+0x1113/0x1440 net/ipv4/fib_frontend.c:1331
fib_inetaddr_event+0xb7/0x1c0 net/ipv4/fib_frontend.c:1450
notifier_call_chain kernel/notifier.c:83 [inline]
blocking_notifier_call_chain+0x103/0x1b0 kernel/notifier.c:318
__inet_del_ifa+0x879/0x1020 net/ipv4/devinet.c:442
inet_del_ifa net/ipv4/devinet.c:479 [inline]
inetdev_destroy net/ipv4/devinet.c:320 [inline]
inetdev_event+0x5b6/0x1370 net/ipv4/devinet.c:1611
notifier_call_chain kernel/notifier.c:83 [inline]
raw_notifier_call_chain+0xcb/0x160 kernel/notifier.c:391
call_netdevice_notifiers_extack net/core/dev.c:2061 [inline]
call_netdevice_notifiers net/core/dev.c:2075 [inline]
unregister_netdevice_many+0x1049/0x19f0 net/core/dev.c:11134
rtnl_delete_link net/core/rtnetlink.c:3114 [inline]
rtnl_dellink+0x52b/0x7b0 net/core/rtnetlink.c:3165
rtnetlink_rcv_msg+0x844/0xf30 net/core/rtnetlink.c:5684
netlink_rcv_skb+0x1f5/0x440 net/netlink/af_netlink.c:2507
netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline]
netlink_unicast+0x774/0x920 net/netlink/af_netlink.c:1344
netlink_sendmsg+0x8ba/0xbe0 net/netlink/af_netlink.c:1918
sock_sendmsg_nosec net/socket.c:706 [inline]
__sock_sendmsg net/socket.c:718 [inline]
____sys_sendmsg+0x5b7/0x8f0 net/socket.c:2445
___sys_sendmsg+0x236/0x2e0 net/socket.c:2499
__sys_sendmsg net/socket.c:2528 [inline]
__do_sys_sendmsg net/socket.c:2537 [inline]
__se_sys_sendmsg+0x1af/0x290 net/socket.c:2535
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: 0033:0x7f453a5d9cb9
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:00007f4538835028 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f453a854fa0 RCX: 00007f453a5d9cb9
RDX: 0000000000000000 RSI: 00002000000000c0 RDI: 0000000000000003
RBP: 00007f453a647bf7 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f453a855038 R14: 00007f453a854fa0 R15: 00007fffb30b6018
----------------
Code disassembly (best guess):
0: 00 00 add %al,(%rax)
2: c7 44 24 04 00 00 00 movl $0x0,0x4(%rsp)
9: 00
a: 4d 8d 66 30 lea 0x30(%r14),%r12
e: 4c 89 e0 mov %r12,%rax
11: 48 c1 e8 03 shr $0x3,%rax
15: 42 80 3c 28 00 cmpb $0x0,(%rax,%r13,1)
1a: 74 08 je 0x24
1c: 4c 89 e7 mov %r12,%rdi
1f: e8 c0 2b 45 f9 call 0xf9452be4
24: 4d 39 3c 24 cmp %r15,(%r12)
28: 74 0a je 0x34
* 2a: e8 95 27 00 f9 call 0xf90027c4 <-- trapping instruction
2f: e9 a7 00 00 00 jmp 0xdb
34: 4d 8d 66 4c lea 0x4c(%r14),%r12
38: 4c 89 e0 mov %r12,%rax
3b: 48 c1 e8 03 shr $0x3,%rax
3f: 42 rex.X