[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 50.211915][ T28] audit: type=1800 audit(1579134778.730:25): pid=8474 uid=0 auid=4294967295 ses=4294967295 subj=_ op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 50.239400][ T28] audit: type=1800 audit(1579134778.730:26): pid=8474 uid=0 auid=4294967295 ses=4294967295 subj=_ op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 50.285921][ T28] audit: type=1800 audit(1579134778.730:27): pid=8474 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 '10.128.0.209' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 63.582704][ T8626] list_del corruption, ffff8880a8d41a00->prev is LIST_POISON2 (dead000000000122) [ 63.592264][ T8626] ------------[ cut here ]------------ [ 63.597940][ T8626] kernel BUG at lib/list_debug.c:50! [ 63.603478][ T8626] invalid opcode: 0000 [#1] PREEMPT SMP KASAN [ 63.609551][ T8626] CPU: 0 PID: 8626 Comm: syz-executor322 Not tainted 5.5.0-rc6-syzkaller #0 [ 63.618339][ T8626] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 63.628397][ T8626] RIP: 0010:__list_del_entry_valid+0xd3/0x100 [ 63.634453][ T8626] Code: 41 5e 41 5f 5d c3 48 c7 c7 83 07 cf 88 4c 89 f6 31 c0 e8 d3 48 c1 fd 0f 0b 48 c7 c7 bb 07 cf 88 4c 89 f6 31 c0 e8 c0 48 c1 fd <0f> 0b 48 c7 c7 f3 07 cf 88 4c 89 f6 31 c0 e8 ad 48 c1 fd 0f 0b 48 [ 63.654254][ T8626] RSP: 0018:ffffc90002127738 EFLAGS: 00010246 [ 63.660326][ T8626] RAX: 000000000000004e RBX: ffff8880a00ebd70 RCX: 622a6c10d9357e00 [ 63.668292][ T8626] RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000 [ 63.676252][ T8626] RBP: ffffc90002127758 R08: ffffffff815f9d64 R09: ffffed1015d865e0 [ 63.684328][ T8626] R10: ffffed1015d865e0 R11: 0000000000000000 R12: dffffc0000000000 [ 63.692398][ T8626] R13: dffffc0000000000 R14: ffff8880a8d41a00 R15: dead000000000122 [ 63.700466][ T8626] FS: 00000000012af880(0000) GS:ffff8880aec00000(0000) knlGS:0000000000000000 [ 63.710028][ T8626] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 63.716653][ T8626] CR2: 0000000020000280 CR3: 0000000096680000 CR4: 00000000001406f0 [ 63.724631][ T8626] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 63.732595][ T8626] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 63.740803][ T8626] Call Trace: [ 63.744083][ T8626] nf_tables_commit+0x17a3/0x41e0 [ 63.749111][ T8626] nfnetlink_rcv+0x1485/0x1e50 [ 63.753886][ T8626] ? rcu_lock_release+0x21/0x30 [ 63.758767][ T8626] ? netlink_deliver_tap+0x142/0x880 [ 63.764090][ T8626] netlink_unicast+0x767/0x920 [ 63.768906][ T8626] netlink_sendmsg+0xa2c/0xd50 [ 63.773804][ T8626] ? netlink_getsockopt+0x9f0/0x9f0 [ 63.778990][ T8626] ____sys_sendmsg+0x4f7/0x7f0 [ 63.783800][ T8626] __sys_sendmsg+0x1ed/0x290 [ 63.788373][ T8626] ? check_preemption_disabled+0xb4/0x260 [ 63.794083][ T8626] ? debug_smp_processor_id+0x9/0x20 [ 63.799361][ T8626] ? debug_smp_processor_id+0x1c/0x20 [ 63.804719][ T8626] ? fpregs_assert_state_consistent+0xb6/0xe0 [ 63.810828][ T8626] ? prepare_exit_to_usermode+0x221/0x5b0 [ 63.816538][ T8626] ? trace_irq_disable_rcuidle+0x23/0x1e0 [ 63.822239][ T8626] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 63.827684][ T8626] ? trace_irq_disable_rcuidle+0x23/0x1e0 [ 63.833388][ T8626] ? do_syscall_64+0x1d/0x1c0 [ 63.838043][ T8626] __x64_sys_sendmsg+0x7f/0x90 [ 63.842783][ T8626] do_syscall_64+0xf7/0x1c0 [ 63.847319][ T8626] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 63.853197][ T8626] RIP: 0033:0x4406a9 [ 63.857068][ T8626] 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 [ 63.876719][ T8626] RSP: 002b:00007ffee7625478 EFLAGS: 00000246 ORIG_RAX: 000000000000002e [ 63.885119][ T8626] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 00000000004406a9 [ 63.893086][ T8626] RDX: 0000000000042000 RSI: 0000000020000140 RDI: 0000000000000004 [ 63.901047][ T8626] RBP: 00000000006ca018 R08: 0000000000000001 R09: 00000000004002c8 [ 63.909031][ T8626] R10: 0000000000000009 R11: 0000000000000246 R12: 0000000000401f30 [ 63.917929][ T8626] R13: 0000000000401fc0 R14: 0000000000000000 R15: 0000000000000000 [ 63.925958][ T8626] Modules linked in: [ 63.930280][ T8626] ---[ end trace 77998d9a0bd5468d ]--- [ 63.935870][ T8626] RIP: 0010:__list_del_entry_valid+0xd3/0x100 [ 63.942372][ T8626] Code: 41 5e 41 5f 5d c3 48 c7 c7 83 07 cf 88 4c 89 f6 31 c0 e8 d3 48 c1 fd 0f 0b 48 c7 c7 bb 07 cf 88 4c 89 f6 31 c0 e8 c0 48 c1 fd <0f> 0b 48 c7 c7 f3 07 cf 88 4c 89 f6 31 c0 e8 ad 48 c1 fd 0f 0b 48 [ 63.962018][ T8626] RSP: 0018:ffffc90002127738 EFLAGS: 00010246 [ 63.968087][ T8626] RAX: 000000000000004e RBX: ffff8880a00ebd70 RCX: 622a6c10d9357e00 [ 63.976122][ T8626] RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000 [ 63.984224][ T8626] RBP: ffffc90002127758 R08: ffffffff815f9d64 R09: ffffed1015d865e0 [ 63.992267][ T8626] R10: ffffed1015d865e0 R11: 0000000000000000 R12: dffffc0000000000 [ 64.000256][ T8626] R13: dffffc0000000000 R14: ffff8880a8d41a00 R15: dead000000000122 [ 64.008346][ T8626] FS: 00000000012af880(0000) GS:ffff8880aec00000(0000) knlGS:0000000000000000 [ 64.017319][ T8626] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 64.023930][ T8626] CR2: 0000000020000280 CR3: 0000000096680000 CR4: 00000000001406f0 [ 64.032201][ T8626] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 64.040192][ T8626] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 64.048251][ T8626] Kernel panic - not syncing: Fatal exception [ 64.055945][ T8626] Kernel Offset: disabled [ 64.060279][ T8626] Rebooting in 86400 seconds..