[ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... [ OK ] Started Update UTMP about System Runlevel Changes. Starting Load/Save RF Kill Switch Status... [ OK ] Started Load/Save RF Kill Switch Status. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.31' (ECDSA) to the list of known hosts. syzkaller login: [ 39.320085] audit: type=1400 audit(1601192957.488:8): avc: denied { execmem } for pid=6501 comm="syz-executor576" scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=process permissive=1 [ 39.349472] hrtimer: interrupt took 46495 ns [ 39.577839] list_del corruption, ffff8880a3a5f738->next is LIST_POISON1 (dead000000000100) [ 39.586952] ------------[ cut here ]------------ [ 39.591724] kernel BUG at lib/list_debug.c:45! [ 39.596585] invalid opcode: 0000 [#1] PREEMPT SMP KASAN [ 39.602118] CPU: 1 PID: 6522 Comm: syz-executor576 Not tainted 4.19.148-syzkaller #0 [ 39.610622] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 39.620394] RIP: 0010:__list_del_entry_valid.cold+0x2c/0x43 [ 39.626122] Code: e2 48 c7 c7 20 f4 51 88 e8 e3 bf b8 fd 0f 0b 48 c7 c7 c0 49 18 8a e8 76 73 13 00 4c 89 ea 48 c7 c7 c0 f3 51 88 e8 c6 bf b8 fd <0f> 0b 48 c7 c7 00 4a 18 8a e8 59 73 13 00 90 90 90 90 90 90 90 90 [ 39.635299] list_del corruption, ffff88808a3d7738->next is LIST_POISON1 (dead000000000100) [ 39.645182] RSP: 0018:ffff8880a3a5f610 EFLAGS: 00010086 [ 39.653884] ------------[ cut here ]------------ [ 39.658932] RAX: 000000000000004e RBX: ffff8880a3a5f720 RCX: 0000000000000000 [ 39.658944] RDX: 0000000000000000 RSI: ffffffff815b523f RDI: ffffed101474beb4 [ 39.663696] kernel BUG at lib/list_debug.c:45! [ 39.671251] RBP: ffff88809f500600 R08: 000000000000004e R09: 0000000000000000 [ 39.690661] R10: 0000000000000005 R11: 0000000000000002 R12: dead000000000200 [ 39.698128] R13: dead000000000100 R14: ffff8880a3a5f740 R15: 0000000000000007 [ 39.705687] FS: 00007f8d7dcc8700(0000) GS:ffff8880ae300000(0000) knlGS:0000000000000000 [ 39.714095] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 39.720755] CR2: 00000000004ccc70 CR3: 0000000092ebb000 CR4: 00000000001406e0 [ 39.728022] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 39.738435] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 39.745696] Call Trace: [ 39.748362] ? remove_wait_queue+0x1d/0x180 [ 39.752735] remove_wait_queue+0x2c/0x180 [ 39.757158] tipc_send_group_bcast+0x34f/0xa60 [ 39.761910] ? tipc_sk_timeout+0x5e0/0x5e0 [ 39.766256] ? do_wait_intr_irq+0x340/0x340 [ 39.770806] ? mark_held_locks+0xf0/0xf0 [ 39.774970] ? __lock_acquire+0x6ec/0x3ff0 [ 39.779206] __tipc_sendmsg+0xa2b/0x1320 [ 39.783356] ? mark_held_locks+0xf0/0xf0 [ 39.787561] ? lock_acquire+0x170/0x3f0 [ 39.791541] ? tipc_sendmcast+0xc10/0xc10 [ 39.795693] ? find_held_lock+0x2d/0x110 [ 39.799745] ? lock_sock_nested+0xa6/0x110 [ 39.804495] ? mark_held_locks+0xa6/0xf0 [ 39.808556] ? __local_bh_enable_ip+0x159/0x2a0 [ 39.813398] ? lockdep_hardirqs_on+0x3c1/0x5e0 [ 39.817973] tipc_sendmsg+0x4c/0x70 [ 39.821592] ? __tipc_sendmsg+0x1320/0x1320 [ 39.825906] sock_sendmsg+0xc7/0x130 [ 39.829738] ___sys_sendmsg+0x3b3/0x8f0 [ 39.833706] ? copy_msghdr_from_user+0x440/0x440 [ 39.838452] ? find_held_lock+0x2d/0x110 [ 39.842504] ? __fget+0x386/0x570 [ 39.845988] ? lock_downgrade+0x750/0x750 [ 39.850126] ? check_preemption_disabled+0x41/0x2b0 [ 39.855133] ? __fget+0x3ad/0x570 [ 39.858582] ? copy_fd_bitmaps+0x2c0/0x2c0 [ 39.862806] ? __fget_light+0x1d1/0x230 [ 39.866770] __sys_sendmmsg+0x195/0x470 [ 39.870734] ? __ia32_sys_sendmsg+0x220/0x220 [ 39.875263] ? mark_held_locks+0xf0/0xf0 [ 39.879316] ? find_held_lock+0x2d/0x110 [ 39.883369] ? finish_task_switch+0x174/0x8b0 [ 39.887859] ? lock_downgrade+0x750/0x750 [ 39.892036] ? ret_from_fork+0x8/0x30 [ 39.895830] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 39.900616] __x64_sys_sendmmsg+0x99/0x100 [ 39.904879] ? lockdep_hardirqs_on+0x3c1/0x5e0 [ 39.909567] do_syscall_64+0xf9/0x670 [ 39.913358] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 39.918538] RIP: 0033:0x446a29 [ 39.921724] Code: e8 0c e8 ff ff 48 83 c4 18 c3 0f 1f 80 00 00 00 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 db 06 fc ff c3 66 2e 0f 1f 84 00 00 00 00 [ 39.940699] RSP: 002b:00007f8d7dcc7db8 EFLAGS: 00000246 ORIG_RAX: 0000000000000133 [ 39.948395] RAX: ffffffffffffffda RBX: 00000000006dbc38 RCX: 0000000000446a29 [ 39.955691] RDX: 08000000000000b0 RSI: 0000000020000a40 RDI: 0000000000000004 [ 39.962948] RBP: 00000000006dbc30 R08: 00007f8d7dcc8700 R09: 0000000000000000 [ 39.970209] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000006dbc3c [ 39.977468] R13: 00007fff7f81f7bf R14: 00007f8d7dcc89c0 R15: 000000000000002d [ 39.984728] Modules linked in: [ 39.987934] ---[ end trace 1417a076254b9d96 ]--- [ 39.988020] invalid opcode: 0000 [#2] PREEMPT SMP KASAN [ 39.992741] RIP: 0010:__list_del_entry_valid.cold+0x2c/0x43 [ 39.998100] CPU: 0 PID: 6523 Comm: syz-executor576 Tainted: G D 4.19.148-syzkaller #0 [ 40.003839] Code: e2 48 c7 c7 20 f4 51 88 e8 e3 bf b8 fd 0f 0b 48 c7 c7 c0 49 18 8a e8 76 73 13 00 4c 89 ea 48 c7 c7 c0 f3 51 88 e8 c6 bf b8 fd <0f> 0b 48 c7 c7 00 4a 18 8a e8 59 73 13 00 90 90 90 90 90 90 90 90 [ 40.013135] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 40.032031] RSP: 0018:ffff8880a3a5f610 EFLAGS: 00010086 [ 40.041388] RIP: 0010:__list_del_entry_valid.cold+0x2c/0x43 [ 40.046852] RAX: 000000000000004e RBX: ffff8880a3a5f720 RCX: 0000000000000000 [ 40.052559] Code: e2 48 c7 c7 20 f4 51 88 e8 e3 bf b8 fd 0f 0b 48 c7 c7 c0 49 18 8a e8 76 73 13 00 4c 89 ea 48 c7 c7 c0 f3 51 88 e8 c6 bf b8 fd <0f> 0b 48 c7 c7 00 4a 18 8a e8 59 73 13 00 90 90 90 90 90 90 90 90 [ 40.059815] RDX: 0000000000000000 RSI: ffffffff815b523f RDI: ffffed101474beb4 [ 40.078932] RSP: 0018:ffff88808a3d7610 EFLAGS: 00010086 [ 40.086195] RBP: ffff88809f500600 R08: 000000000000004e R09: 0000000000000000 [ 40.091559] RAX: 000000000000004e RBX: ffff88808a3d7720 RCX: 0000000000000000 [ 40.098961] R10: 0000000000000005 R11: 0000000000000002 R12: dead000000000200 [ 40.106319] RDX: 0000000000000000 RSI: ffffffff815b523f RDI: ffffed101147aeb4 [ 40.113714] R13: dead000000000100 R14: ffff8880a3a5f740 R15: 0000000000000007 [ 40.120978] RBP: ffff8880a0c9c180 R08: 000000000000004e R09: 0000000000000000 [ 40.128240] FS: 00007f8d7dcc8700(0000) GS:ffff8880ae300000(0000) knlGS:0000000000000000 [ 40.135497] R10: 0000000000000005 R11: 000000000fdf579f R12: dead000000000200 [ 40.135510] R13: dead000000000100 R14: ffff88808a3d7740 R15: 0000000000000007 [ 40.143720] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 40.143730] CR2: 00000000004ccc70 CR3: 0000000092ebb000 CR4: 00000000001406e0 [ 40.150994] FS: 00007f8d7dcc8700(0000) GS:ffff8880ae200000(0000) knlGS:0000000000000000 [ 40.158251] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 40.164123] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 40.171383] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 40.179623] CR2: 00000000004ccc70 CR3: 000000008e1d8000 CR4: 00000000001406f0 [ 40.186880] Kernel panic - not syncing: Fatal exception [ 40.192753] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 40.219887] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 40.227151] Call Trace: [ 40.229871] ? remove_wait_queue+0x1d/0x180 [ 40.234440] remove_wait_queue+0x2c/0x180 [ 40.238588] tipc_send_group_bcast+0x34f/0xa60 [ 40.243170] ? tipc_sk_timeout+0x5e0/0x5e0 [ 40.247445] ? do_wait_intr_irq+0x340/0x340 [ 40.251765] ? mark_held_locks+0xf0/0xf0 [ 40.255870] ? __lock_acquire+0x6ec/0x3ff0 [ 40.260305] __tipc_sendmsg+0xa2b/0x1320 [ 40.264363] ? mark_held_locks+0xf0/0xf0 [ 40.268420] ? lock_acquire+0x170/0x3f0 [ 40.272580] ? tipc_sendmcast+0xc10/0xc10 [ 40.276735] ? find_held_lock+0x2d/0x110 [ 40.280796] ? lock_sock_nested+0xa6/0x110 [ 40.285043] ? mark_held_locks+0xa6/0xf0 [ 40.289631] ? __local_bh_enable_ip+0x159/0x2a0 [ 40.294301] ? lockdep_hardirqs_on+0x3c1/0x5e0 [ 40.298925] tipc_sendmsg+0x4c/0x70 [ 40.302552] ? __tipc_sendmsg+0x1320/0x1320 [ 40.306875] sock_sendmsg+0xc7/0x130 [ 40.310588] ___sys_sendmsg+0x3b3/0x8f0 [ 40.314562] ? copy_msghdr_from_user+0x440/0x440 [ 40.319331] ? find_held_lock+0x2d/0x110 [ 40.323388] ? __fget+0x386/0x570 [ 40.326840] ? lock_downgrade+0x750/0x750 [ 40.331008] ? check_preemption_disabled+0x41/0x2b0 [ 40.336022] ? __fget+0x3ad/0x570 [ 40.339475] ? copy_fd_bitmaps+0x2c0/0x2c0 [ 40.343751] ? __fget_light+0x1d1/0x230 [ 40.347724] __sys_sendmmsg+0x195/0x470 [ 40.353431] ? __ia32_sys_sendmsg+0x220/0x220 [ 40.358087] ? mark_held_locks+0xf0/0xf0 [ 40.362149] ? find_held_lock+0x2d/0x110 [ 40.366208] ? finish_task_switch+0x174/0x8b0 [ 40.370704] ? lock_downgrade+0x750/0x750 [ 40.374852] ? ret_from_fork+0x8/0x30 [ 40.378651] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 40.383403] __x64_sys_sendmmsg+0x99/0x100 [ 40.387648] ? lockdep_hardirqs_on+0x3c1/0x5e0 [ 40.392228] do_syscall_64+0xf9/0x670 [ 40.396028] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 40.401214] RIP: 0033:0x446a29 [ 40.404406] Code: e8 0c e8 ff ff 48 83 c4 18 c3 0f 1f 80 00 00 00 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 db 06 fc ff c3 66 2e 0f 1f 84 00 00 00 00 [ 40.423348] RSP: 002b:00007f8d7dcc7db8 EFLAGS: 00000246 ORIG_RAX: 0000000000000133 [ 40.431101] RAX: ffffffffffffffda RBX: 00000000006dbc38 RCX: 0000000000446a29 [ 40.438634] RDX: 08000000000000b0 RSI: 0000000020000a40 RDI: 0000000000000004 [ 40.446081] RBP: 00000000006dbc30 R08: 00007f8d7dcc8700 R09: 0000000000000000 [ 40.453360] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000006dbc3c [ 40.460676] R13: 00007fff7f81f7bf R14: 00007f8d7dcc89c0 R15: 000000000000002d [ 40.467944] Modules linked in: [ 40.471137] ---[ end trace 1417a076254b9d97 ]--- [ 40.475892] RIP: 0010:__list_del_entry_valid.cold+0x2c/0x43 [ 40.481599] Code: e2 48 c7 c7 20 f4 51 88 e8 e3 bf b8 fd 0f 0b 48 c7 c7 c0 49 18 8a e8 76 73 13 00 4c 89 ea 48 c7 c7 c0 f3 51 88 e8 c6 bf b8 fd <0f> 0b 48 c7 c7 00 4a 18 8a e8 59 73 13 00 90 90 90 90 90 90 90 90 [ 40.500509] RSP: 0018:ffff8880a3a5f610 EFLAGS: 00010086 [ 40.505895] RAX: 000000000000004e RBX: ffff8880a3a5f720 RCX: 0000000000000000 [ 40.513163] RDX: 0000000000000000 RSI: ffffffff815b523f RDI: ffffed101474beb4 [ 40.520427] RBP: ffff88809f500600 R08: 000000000000004e R09: 0000000000000000 [ 40.527692] R10: 0000000000000005 R11: 0000000000000002 R12: dead000000000200 [ 40.534957] R13: dead000000000100 R14: ffff8880a3a5f740 R15: 0000000000000007 [ 40.542312] FS: 00007f8d7dcc8700(0000) GS:ffff8880ae200000(0000) knlGS:0000000000000000 [ 40.550533] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 40.556408] CR2: 00000000004ccc70 CR3: 000000008e1d8000 CR4: 00000000001406f0 [ 40.563675] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 40.570952] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 41.320849] Shutting down cpus with NMI [ 41.326572] Kernel Offset: disabled [ 41.330374] Rebooting in 86400 seconds..