------------[ cut here ]------------
WARNING: CPU: 0 PID: 10658 at net/core/flow_dissector.c:1107 __skb_flow_dissect+0xb05/0x6e70 net/core/flow_dissector.c:1102
Modules linked in:
CPU: 0 PID: 10658 Comm: syz.9.1126 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026
RIP: 0010:__skb_flow_dissect+0xb05/0x6e70 net/core/flow_dissector.c:1107
Code: c6 e8 9f 83 04 f9 85 db 0f 84 9a 06 00 00 80 3d cb be f3 05 01 0f 85 c0 06 00 00 e8 d5 7f 04 f9 e9 d5 f9 ff ff e8 cb 7f 04 f9 <0f> 0b e8 94 a0 0f 02 89 c3 31 ff 89 c6 e8 69 83 04 f9 85 db 74 18
RSP: 0018:ffffc90000006940 EFLAGS: 00010246
RAX: ffffffff888310e5 RBX: 0000000000000000 RCX: ffff88802d491e00
RDX: 0000000000000100 RSI: ffffffff8b1d4000 RDI: ffffffff8b1d3fc0
RBP: ffffc90000006f58 R08: dffffc0000000000 R09: 1ffffffff223e0a0
R10: dffffc0000000000 R11: fffffbfff223e0a1 R12: ffffffff8e8cd438
R13: 1ffffffff1d19a88 R14: ffffffff8e8cd442 R15: dffffc0000000000
FS: 0000000000000000(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f501046022c CR3: 000000005d91b000 CR4: 00000000003506f0
Call Trace:
skb_flow_dissect_flow_keys include/linux/skbuff.h:1544 [inline]
___skb_get_hash net/core/flow_dissector.c:1806 [inline]
__skb_get_hash+0xf3/0x2e0 net/core/flow_dissector.c:1871
skb_get_hash include/linux/skbuff.h:1586 [inline]
nft_trace_init+0x1bb/0x420 net/netfilter/nf_tables_trace.c:316
nft_do_chain+0x1523/0x1620 net/netfilter/nf_tables_core.c:268
nft_do_chain_ipv4+0x160/0x230 net/netfilter/nft_chain_filter.c:23
nf_hook_entry_hookfn include/linux/netfilter.h:144 [inline]
nf_hook_slow+0xbd/0x200 net/netfilter/core.c:626
nf_hook+0x228/0x390 include/linux/netfilter.h:259
__ip_local_out+0x4db/0x5f0 net/ipv4/ip_output.c:118
ip_local_out+0x2a/0x130 net/ipv4/ip_output.c:127
iptunnel_xmit+0x4d0/0x910 net/ipv4/ip_tunnel_core.c:82
udp_tunnel_xmit_skb+0x22f/0x380 net/ipv4/udp_tunnel_core.c:172
tipc_udp_xmit+0x861/0xb40 net/tipc/udp_media.c:198
tipc_udp_send_msg+0x27e/0x3e0 net/tipc/udp_media.c:271
tipc_bearer_xmit_skb+0x2ad/0x3f0 net/tipc/bearer.c:576
tipc_disc_timeout+0x5f7/0x750 net/tipc/discover.c:340
call_timer_fn+0x189/0x540 kernel/time/timer.c:1701
expire_timers kernel/time/timer.c:1752 [inline]
__run_timers+0x570/0x810 kernel/time/timer.c:2023
run_timer_softirq+0x67/0xf0 kernel/time/timer.c:2036
handle_softirqs+0x27d/0x820 kernel/softirq.c:578
__do_softirq kernel/softirq.c:612 [inline]
invoke_softirq kernel/softirq.c:452 [inline]
__irq_exit_rcu+0xd3/0x190 kernel/softirq.c:661
irq_exit_rcu+0x9/0x20 kernel/softirq.c:673
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1088 [inline]
sysvec_apic_timer_interrupt+0xa4/0xc0 arch/x86/kernel/apic/apic.c:1088
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:687
RIP: 0010:unwind_next_frame+0x176e/0x2990 arch/x86/kernel/unwind_orc.c:648
Code: 48 c1 e8 03 42 0f b6 04 38 84 c0 0f 85 f2 10 00 00 48 89 d8 48 c1 e8 03 42 0f b6 04 38 84 c0 48 8b 74 24 08 0f 85 f9 10 00 00 <49> 0f bf 06 48 01 c6 49 8d 55 40 4c 89 ef e8 cf 14 00 00 84 c0 0f
RSP: 0018:ffffc90004466e58 EFLAGS: 00000246
RAX: 0000000000000000 RBX: ffffffff8f1ce08b RCX: 0000000000000003
RDX: ffffffff813bcaa1 RSI: ffffc90004467a20 RDI: 0000000000000001
RBP: ffffc90004466f78 R08: ffff88802d491e00 R09: 0000000000000003
R10: 0000000000000004 R11: 0000000000000000 R12: ffffc90004467988
R13: ffffc90004466f28 R14: ffffffff8f1ce08a R15: dffffc0000000000
arch_stack_walk+0x144/0x190 arch/x86/kernel/stacktrace.c:25
stack_trace_save+0xaa/0x100 kernel/stacktrace.c:122
save_stack+0x125/0x230 mm/page_owner.c:128
__reset_page_owner+0x4e/0x190 mm/page_owner.c:149
reset_page_owner include/linux/page_owner.h:24 [inline]
free_pages_prepare mm/page_alloc.c:1182 [inline]
free_unref_page_prepare+0x7d7/0x8f0 mm/page_alloc.c:2366
free_unref_page_list+0xbe/0x860 mm/page_alloc.c:2505
release_pages+0x208a/0x2300 mm/swap.c:1022
__folio_batch_release+0x71/0xe0 mm/swap.c:1042
folio_batch_release include/linux/pagevec.h:83 [inline]
shmem_undo_range+0x5ff/0x1a80 mm/shmem.c:1026
shmem_truncate_range mm/shmem.c:1135 [inline]
shmem_evict_inode+0x285/0xa70 mm/shmem.c:1264
evict+0x4b7/0x8a0 fs/inode.c:705
__dentry_kill+0x412/0x630 fs/dcache.c:611
dentry_kill+0xb8/0x290 fs/dcache.c:-1
dput+0xfe/0x1e0 fs/dcache.c:918
__fput+0x5b2/0x940 fs/file_table.c:426
task_work_run+0x1d4/0x260 kernel/task_work.c:245
exit_task_work include/linux/task_work.h:43 [inline]
do_exit+0x986/0x2530 kernel/exit.c:890
do_group_exit+0x22d/0x2f0 kernel/exit.c:1032
get_signal+0x12a6/0x1390 kernel/signal.c:2915
arch_do_signal_or_restart+0xc2/0x7b0 arch/x86/kernel/signal.c:310
exit_to_user_mode_loop+0x70/0x110 kernel/entry/common.c:177
exit_to_user_mode_prepare+0xee/0x180 kernel/entry/common.c:213
irqentry_exit_to_user_mode+0x9/0x30 kernel/entry/common.c:318
exc_page_fault+0x8c/0x100 arch/x86/mm/fault.c:1519
asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:608
RIP: 0033:0x7f501039e1a1
Code: Unable to access opcode bytes at 0x7f501039e177.
RSP: 002b:fffffffffffffe70 EFLAGS: 00010217
RAX: 0000000000000000 RBX: 00007f5010625fa0 RCX: 00007f501039e199
RDX: 0000000000000000 RSI: fffffffffffffe70 RDI: 0000000000008000
RBP: 00007f50104358e0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000
R13: 00007f5010626038 R14: 00007f5010625fa0 R15: 00007ffdded26d48
----------------
Code disassembly (best guess):
0: 48 c1 e8 03 shr $0x3,%rax
4: 42 0f b6 04 38 movzbl (%rax,%r15,1),%eax
9: 84 c0 test %al,%al
b: 0f 85 f2 10 00 00 jne 0x1103
11: 48 89 d8 mov %rbx,%rax
14: 48 c1 e8 03 shr $0x3,%rax
18: 42 0f b6 04 38 movzbl (%rax,%r15,1),%eax
1d: 84 c0 test %al,%al
1f: 48 8b 74 24 08 mov 0x8(%rsp),%rsi
24: 0f 85 f9 10 00 00 jne 0x1123
* 2a: 49 0f bf 06 movswq (%r14),%rax <-- trapping instruction
2e: 48 01 c6 add %rax,%rsi
31: 49 8d 55 40 lea 0x40(%r13),%rdx
35: 4c 89 ef mov %r13,%rdi
38: e8 cf 14 00 00 call 0x150c
3d: 84 c0 test %al,%al
3f: 0f .byte 0xf