[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 72.141880][ T27] audit: type=1800 audit(1579144097.517:25): pid=9489 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 72.162926][ T27] audit: type=1800 audit(1579144097.527:26): pid=9489 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 72.184506][ T27] audit: type=1800 audit(1579144097.527:27): pid=9489 uid=0 auid=4294967295 ses=4294967295 subj==unconfined 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 '10.128.0.40' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 80.336416][ T9641] list_del corruption, ffff8880a94a5500->prev is LIST_POISON2 (dead000000000122) [ 80.345911][ T9641] ------------[ cut here ]------------ [ 80.351351][ T9641] kernel BUG at lib/list_debug.c:48! [ 80.356763][ T9641] invalid opcode: 0000 [#1] PREEMPT SMP KASAN [ 80.362833][ T9641] CPU: 1 PID: 9641 Comm: syz-executor436 Not tainted 5.5.0-rc6-syzkaller #0 [ 80.371477][ T9641] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 80.381520][ T9641] RIP: 0010:__list_del_entry_valid.cold+0x37/0x4f [ 80.388086][ T9641] Code: be fd 0f 0b 4c 89 ea 4c 89 f6 48 c7 c7 20 66 71 88 e8 c0 e7 be fd 0f 0b 4c 89 e2 4c 89 f6 48 c7 c7 80 66 71 88 e8 ac e7 be fd <0f> 0b 4c 89 f6 48 c7 c7 40 67 71 88 e8 9b e7 be fd 0f 0b cc cc cc [ 80.407669][ T9641] RSP: 0018:ffffc900023d7338 EFLAGS: 00010286 [ 80.413718][ T9641] RAX: 000000000000004e RBX: ffff8880a94a5500 RCX: 0000000000000000 [ 80.421666][ T9641] RDX: 0000000000000000 RSI: ffffffff815e5396 RDI: fffff5200047ae59 [ 80.429623][ T9641] RBP: ffffc900023d7350 R08: 000000000000004e R09: ffffed1015d26621 [ 80.437582][ T9641] R10: ffffed1015d26620 R11: ffff8880ae933107 R12: dead000000000122 [ 80.445544][ T9641] R13: ffff8880a96b8170 R14: ffff8880a94a5500 R15: ffff8880a94a5508 [ 80.453491][ T9641] FS: 0000000001e28880(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000 [ 80.462393][ T9641] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 80.468950][ T9641] CR2: 0000000020000280 CR3: 000000008e2b2000 CR4: 00000000001406e0 [ 80.476911][ T9641] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 80.484857][ T9641] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 80.492803][ T9641] Call Trace: [ 80.496072][ T9641] nft_obj_del+0xcb/0x1f0 [ 80.500378][ T9641] ? nft_unregister_flowtable_type+0x130/0x130 [ 80.506526][ T9641] ? nf_tables_getflowtable+0x4c0/0x4c0 [ 80.512046][ T9641] ? nft_objname_hash+0x610/0x610 [ 80.517044][ T9641] ? nft_chain_hash_cmp+0x80/0x80 [ 80.522044][ T9641] nf_tables_commit+0x1339/0x3b30 [ 80.527047][ T9641] ? nla_memcpy+0xb0/0xb0 [ 80.531354][ T9641] ? nf_tables_setelem_notify.constprop.0+0x1f0/0x1f0 [ 80.538088][ T9641] ? __nla_parse+0x43/0x60 [ 80.542502][ T9641] nfnetlink_rcv_batch+0xc78/0x17a0 [ 80.547678][ T9641] ? nf_tables_dump_chains+0x6c1/0x8e0 [ 80.553120][ T9641] ? nfnetlink_subsys_register+0x2b0/0x2b0 [ 80.558902][ T9641] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 80.565117][ T9641] ? apparmor_capable+0x497/0x900 [ 80.570137][ T9641] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 80.576364][ T9641] ? __nla_validate_parse+0x2d0/0x1ee0 [ 80.581800][ T9641] ? cap_capable+0x205/0x270 [ 80.586629][ T9641] ? nla_memcpy+0xb0/0xb0 [ 80.590938][ T9641] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 80.597191][ T9641] ? ns_capable_common+0x93/0x100 [ 80.602204][ T9641] ? __nla_parse+0x43/0x60 [ 80.606603][ T9641] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 80.612303][ T9641] nfnetlink_rcv+0x3e7/0x460 [ 80.616884][ T9641] ? nfnetlink_rcv_batch+0x17a0/0x17a0 [ 80.622328][ T9641] ? netlink_deliver_tap+0x24a/0xbe0 [ 80.627593][ T9641] ? __kasan_check_write+0x14/0x20 [ 80.632708][ T9641] netlink_unicast+0x58c/0x7d0 [ 80.637457][ T9641] ? netlink_attachskb+0x870/0x870 [ 80.642550][ T9641] ? __sanitizer_cov_trace_cmp8+0x18/0x20 [ 80.648245][ T9641] ? __check_object_size+0x3d/0x437 [ 80.653420][ T9641] netlink_sendmsg+0x91c/0xea0 [ 80.658159][ T9641] ? netlink_unicast+0x7d0/0x7d0 [ 80.663071][ T9641] ? aa_sock_msg_perm.isra.0+0xba/0x170 [ 80.668593][ T9641] ? apparmor_socket_sendmsg+0x2a/0x30 [ 80.674027][ T9641] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 80.680240][ T9641] ? security_socket_sendmsg+0x8d/0xc0 [ 80.685674][ T9641] ? netlink_unicast+0x7d0/0x7d0 [ 80.690595][ T9641] sock_sendmsg+0xd7/0x130 [ 80.695000][ T9641] ____sys_sendmsg+0x753/0x880 [ 80.699740][ T9641] ? kernel_sendmsg+0x50/0x50 [ 80.704393][ T9641] ? lockdep_init_map+0x1be/0x6d0 [ 80.709394][ T9641] ___sys_sendmsg+0x100/0x170 [ 80.714048][ T9641] ? sendmsg_copy_msghdr+0x70/0x70 [ 80.719137][ T9641] ? __kasan_check_read+0x11/0x20 [ 80.724136][ T9641] ? __lock_acquire+0x8a0/0x4a00 [ 80.729050][ T9641] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 80.735268][ T9641] ? __this_cpu_preempt_check+0x35/0x190 [ 80.740884][ T9641] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 80.747100][ T9641] ? percpu_counter_add_batch+0x13c/0x190 [ 80.752804][ T9641] ? __fd_install+0x1bc/0x640 [ 80.757463][ T9641] ? find_held_lock+0x35/0x130 [ 80.762212][ T9641] ? __fd_install+0x1bc/0x640 [ 80.766877][ T9641] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 80.773094][ T9641] ? __fget_light+0x1a9/0x230 [ 80.777745][ T9641] ? __fdget+0x1b/0x20 [ 80.781789][ T9641] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 80.788003][ T9641] __sys_sendmsg+0x105/0x1d0 [ 80.792572][ T9641] ? __sys_sendmsg_sock+0xc0/0xc0 [ 80.797576][ T9641] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 80.803009][ T9641] ? do_syscall_64+0x26/0x790 [ 80.807661][ T9641] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 80.813701][ T9641] ? do_syscall_64+0x26/0x790 [ 80.818355][ T9641] __x64_sys_sendmsg+0x78/0xb0 [ 80.823097][ T9641] do_syscall_64+0xfa/0x790 [ 80.827661][ T9641] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 80.833527][ T9641] RIP: 0033:0x4406a9 [ 80.837397][ T9641] 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 [ 80.856974][ T9641] RSP: 002b:00007ffd7c847848 EFLAGS: 00000246 ORIG_RAX: 000000000000002e [ 80.865368][ T9641] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 00000000004406a9 [ 80.873349][ T9641] RDX: 0000000000042000 RSI: 0000000020000140 RDI: 0000000000000004 [ 80.881310][ T9641] RBP: 00000000006ca018 R08: 0000000000000001 R09: 00000000004002c8 [ 80.889271][ T9641] R10: 0000000000000009 R11: 0000000000000246 R12: 0000000000401f30 [ 80.897218][ T9641] R13: 0000000000401fc0 R14: 0000000000000000 R15: 0000000000000000 [ 80.905180][ T9641] Modules linked in: [ 80.910170][ T9641] ---[ end trace ae5e27d79f8a6a0d ]--- [ 80.915759][ T9641] RIP: 0010:__list_del_entry_valid.cold+0x37/0x4f [ 80.922152][ T9641] Code: be fd 0f 0b 4c 89 ea 4c 89 f6 48 c7 c7 20 66 71 88 e8 c0 e7 be fd 0f 0b 4c 89 e2 4c 89 f6 48 c7 c7 80 66 71 88 e8 ac e7 be fd <0f> 0b 4c 89 f6 48 c7 c7 40 67 71 88 e8 9b e7 be fd 0f 0b cc cc cc [ 80.941788][ T9641] RSP: 0018:ffffc900023d7338 EFLAGS: 00010286 [ 80.947873][ T9641] RAX: 000000000000004e RBX: ffff8880a94a5500 RCX: 0000000000000000 [ 80.955991][ T9641] RDX: 0000000000000000 RSI: ffffffff815e5396 RDI: fffff5200047ae59 [ 80.963968][ T9641] RBP: ffffc900023d7350 R08: 000000000000004e R09: ffffed1015d26621 [ 80.972031][ T9641] R10: ffffed1015d26620 R11: ffff8880ae933107 R12: dead000000000122 [ 80.980030][ T9641] R13: ffff8880a96b8170 R14: ffff8880a94a5500 R15: ffff8880a94a5508 [ 80.988022][ T9641] FS: 0000000001e28880(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000 [ 80.997709][ T9641] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 81.004298][ T9641] CR2: 000055eb653af0d0 CR3: 000000008e2b2000 CR4: 00000000001406f0 [ 81.012289][ T9641] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 81.020256][ T9641] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 81.028541][ T9641] Kernel panic - not syncing: Fatal exception [ 81.036081][ T9641] Kernel Offset: disabled [ 81.040397][ T9641] Rebooting in 86400 seconds..