[ OK ] Reached target Login Prompts. [ OK ] Reached target Multi-User System. [ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... [ OK ] Started Update UTMP about System Runlevel Changes. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.62' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 41.058509][ T6775] ------------[ cut here ]------------ [ 41.064077][ T6775] hook not found, pf 2 num 0 [ 41.064342][ T6775] WARNING: CPU: 0 PID: 6775 at net/netfilter/core.c:413 __nf_unregister_net_hook+0x3e6/0x4a0 [ 41.080043][ T6775] Kernel panic - not syncing: panic_on_warn set ... [ 41.086607][ T6775] CPU: 0 PID: 6775 Comm: syz-executor554 Not tainted 5.8.0-rc4-syzkaller #0 [ 41.095246][ T6775] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 41.105287][ T6775] Call Trace: [ 41.108552][ T6775] dump_stack+0x1f0/0x31e [ 41.112854][ T6775] panic+0x264/0x7a0 [ 41.116721][ T6775] ? __warn+0x102/0x250 [ 41.120850][ T6775] ? __nf_unregister_net_hook+0x3e6/0x4a0 [ 41.126547][ T6775] ? __nf_unregister_net_hook+0x3e6/0x4a0 [ 41.132235][ T6775] __warn+0x227/0x250 [ 41.136192][ T6775] ? __nf_unregister_net_hook+0x3e6/0x4a0 [ 41.141881][ T6775] report_bug+0x1b1/0x2e0 [ 41.146204][ T6775] handle_bug+0x42/0x80 [ 41.150345][ T6775] exc_invalid_op+0x16/0x40 [ 41.154859][ T6775] asm_exc_invalid_op+0x12/0x20 [ 41.159690][ T6775] RIP: 0010:__nf_unregister_net_hook+0x3e6/0x4a0 [ 41.166002][ T6775] Code: 49 30 c3 02 01 48 8b 44 24 20 42 8a 04 28 84 c0 0f 85 ad 00 00 00 41 8b 14 24 48 c7 c7 78 ad 08 89 89 de 31 c0 e8 6a 5a a0 fa <0f> 0b e9 04 ff ff ff 44 89 e1 80 e1 07 80 c1 03 38 c1 0f 8c 44 fc [ 41.185963][ T6775] RSP: 0018:ffffc90001277718 EFLAGS: 00010246 [ 41.192010][ T6775] RAX: 08b629c459c08900 RBX: 0000000000000002 RCX: ffff8880941721c0 [ 41.199954][ T6775] RDX: 0000000000000000 RSI: 0000000000000008 RDI: 0000000000000282 [ 41.207907][ T6775] RBP: ffffffff895b8008 R08: dffffc0000000000 R09: fffffbfff16338a7 [ 41.215881][ T6775] R10: fffffbfff16338a7 R11: 0000000000000000 R12: ffff888094f5461c [ 41.223828][ T6775] R13: dffffc0000000000 R14: 0000000000000050 R15: ffffffff895b7040 [ 41.231789][ T6775] ? __nf_unregister_net_hook+0x3e6/0x4a0 [ 41.237495][ T6775] nf_tables_commit+0x32d3/0x4d70 [ 41.242497][ T6775] nfnetlink_rcv+0x14a5/0x1e50 [ 41.247252][ T6775] ? trace_lock_release+0x137/0x1a0 [ 41.252440][ T6775] netlink_unicast+0x786/0x940 [ 41.257199][ T6775] netlink_sendmsg+0xa57/0xd70 [ 41.261939][ T6775] ? netlink_getsockopt+0x9e0/0x9e0 [ 41.267126][ T6775] ____sys_sendmsg+0x519/0x800 [ 41.271882][ T6775] ? import_iovec+0x12a/0x2c0 [ 41.276546][ T6775] __sys_sendmsg+0x2b1/0x360 [ 41.281108][ T6775] ? trace_lock_release+0x137/0x1a0 [ 41.286300][ T6775] ? do_user_addr_fault+0x768/0xba0 [ 41.291469][ T6775] ? lock_is_held_type+0x87/0xe0 [ 41.296379][ T6775] ? entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 41.302415][ T6775] do_syscall_64+0x73/0xe0 [ 41.306826][ T6775] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 41.313033][ T6775] RIP: 0033:0x440709 [ 41.316895][ T6775] Code: Bad RIP value. [ 41.320946][ T6775] RSP: 002b:00007fff97b1aa78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e [ 41.329325][ T6775] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440709 [ 41.337269][ T6775] RDX: 0000000000000000 RSI: 000000002000c2c0 RDI: 0000000000000003 [ 41.345820][ T6775] RBP: 00000000006ca018 R08: 0000000000000000 R09: 00000000004002c8 [ 41.353851][ T6775] R10: 0000000000000003 R11: 0000000000000246 R12: 0000000000401f10 [ 41.362228][ T6775] R13: 0000000000401fa0 R14: 0000000000000000 R15: 0000000000000000 [ 41.371771][ T6775] Kernel Offset: disabled [ 41.376216][ T6775] Rebooting in 86400 seconds..