[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 49.271963][ T27] audit: type=1800 audit(1579132072.672:25): pid=8470 uid=0 auid=4294967295 ses=4294967295 subj=_ op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 49.291963][ T27] audit: type=1800 audit(1579132072.672:26): pid=8470 uid=0 auid=4294967295 ses=4294967295 subj=_ op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 49.343449][ T27] audit: type=1800 audit(1579132072.672:27): pid=8470 uid=0 auid=4294967295 ses=4294967295 subj=_ op=collect_data cause=failed(directio) comm="startpar" name="restorecond" dev="sda1" ino=2436 res=0 [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.0.157' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 61.302427][ T8621] netlink: 760 bytes leftover after parsing attributes in process `syz-executor332'. [ 61.351125][ T8621] ------------[ cut here ]------------ [ 61.356724][ T8621] truncated: 'nft-expr-0-LMMR~*{F DcHc(?V' (len 209) [ 61.356978][ T8621] WARNING: CPU: 1 PID: 8621 at net/netfilter/nf_tables_api.c:588 nft_request_module+0x103/0x110 [ 61.376631][ T8621] Kernel panic - not syncing: panic_on_warn set ... [ 61.383212][ T8621] CPU: 1 PID: 8621 Comm: syz-executor332 Not tainted 5.5.0-rc6-syzkaller #0 [ 61.391972][ T8621] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 61.402017][ T8621] Call Trace: [ 61.405295][ T8621] dump_stack+0x1fb/0x318 [ 61.409673][ T8621] panic+0x264/0x7a9 [ 61.413614][ T8621] ? __warn+0x105/0x210 [ 61.417901][ T8621] ? nft_request_module+0x103/0x110 [ 61.423137][ T8621] __warn+0x209/0x210 [ 61.427113][ T8621] ? nft_request_module+0x103/0x110 [ 61.432638][ T8621] report_bug+0x1b6/0x2f0 [ 61.437012][ T8621] ? nft_request_module+0x103/0x110 [ 61.442525][ T8621] do_error_trap+0xda/0x440 [ 61.447013][ T8621] do_invalid_op+0x36/0x40 [ 61.451422][ T8621] ? nft_request_module+0x103/0x110 [ 61.456677][ T8621] invalid_op+0x23/0x30 [ 61.460942][ T8621] RIP: 0010:nft_request_module+0x103/0x110 [ 61.466749][ T8621] Code: 88 00 00 00 75 28 48 8d 65 f0 5b 41 5e 5d c3 e8 a3 3b e0 fa 48 8d 74 24 50 48 c7 c7 e0 ba e2 88 44 89 f2 31 c0 e8 ad 47 b2 fa <0f> 0b eb c5 e8 44 48 b2 fa 0f 1f 40 00 55 48 89 e5 41 57 41 56 41 [ 61.486556][ T8621] RSP: 0018:ffffc90001ea75b0 EFLAGS: 00010246 [ 61.492603][ T8621] RAX: a0c74c5486a24900 RBX: ffffffff89353700 RCX: ffff88808f06c1c0 [ 61.500566][ T8621] RDX: 0000000000000000 RSI: 0000000000000008 RDI: 0000000000000282 [ 61.508674][ T8621] RBP: ffffc90001ea7650 R08: ffff88808f06ca18 R09: fffffbfff13cd132 [ 61.516635][ T8621] R10: fffffbfff13cd132 R11: 0000000000000000 R12: dffffc0000000000 [ 61.524772][ T8621] R13: ffff8880a3f8f168 R14: 00000000000000d1 R15: ffffffff8936d1f0 [ 61.532762][ T8621] nf_tables_expr_parse+0x308/0x9e0 [ 61.537957][ T8621] ? kvmalloc_node+0xf4/0x110 [ 61.542627][ T8621] nf_tables_newrule+0xefb/0x2d90 [ 61.547654][ T8621] ? __nla_parse+0x41/0x50 [ 61.552068][ T8621] ? nf_tables_delchain+0xd40/0xd40 [ 61.557279][ T8621] nfnetlink_rcv+0xecf/0x1e50 [ 61.561965][ T8621] ? rcu_lock_release+0x21/0x30 [ 61.566835][ T8621] ? netlink_deliver_tap+0x142/0x880 [ 61.572233][ T8621] netlink_unicast+0x767/0x920 [ 61.577107][ T8621] netlink_sendmsg+0xa2c/0xd50 [ 61.581943][ T8621] ? netlink_getsockopt+0x9f0/0x9f0 [ 61.587185][ T8621] ____sys_sendmsg+0x4f7/0x7f0 [ 61.591955][ T8621] __sys_sendmsg+0x1ed/0x290 [ 61.596550][ T8621] ? check_preemption_disabled+0xb4/0x260 [ 61.602289][ T8621] ? debug_smp_processor_id+0x9/0x20 [ 61.607708][ T8621] ? debug_smp_processor_id+0x1c/0x20 [ 61.613188][ T8621] ? fpregs_assert_state_consistent+0xb6/0xe0 [ 61.619258][ T8621] ? prepare_exit_to_usermode+0x221/0x5b0 [ 61.625105][ T8621] ? trace_irq_disable_rcuidle+0x23/0x1e0 [ 61.630832][ T8621] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 61.636286][ T8621] ? trace_irq_disable_rcuidle+0x23/0x1e0 [ 61.642015][ T8621] ? do_syscall_64+0x1d/0x1c0 [ 61.646704][ T8621] __x64_sys_sendmsg+0x7f/0x90 [ 61.651459][ T8621] do_syscall_64+0xf7/0x1c0 [ 61.656131][ T8621] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 61.662008][ T8621] RIP: 0033:0x440619 [ 61.665948][ T8621] Code: 18 89 d0 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 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 0f 83 fb 13 fc ff c3 66 2e 0f 1f 84 00 00 00 00 [ 61.685594][ T8621] RSP: 002b:00007ffeca951478 EFLAGS: 00000246 ORIG_RAX: 000000000000002e [ 61.694009][ T8621] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440619 [ 61.701973][ T8621] RDX: 0000000000000000 RSI: 0000000020000240 RDI: 0000000000000005 [ 61.710000][ T8621] RBP: 00000000006cb018 R08: 00000000004002c8 R09: 00000000004002c8 [ 61.717971][ T8621] R10: 00000000004002c8 R11: 0000000000000246 R12: 0000000000401ea0 [ 61.726046][ T8621] R13: 0000000000401f30 R14: 0000000000000000 R15: 0000000000000000 [ 61.736007][ T8621] Kernel Offset: disabled [ 61.740398][ T8621] Rebooting in 86400 seconds..