[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [ 37.650980] audit: type=1800 audit(1552562501.966:25): pid=7642 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 37.684323] audit: type=1800 audit(1552562501.976:26): pid=7642 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 37.709725] audit: type=1800 audit(1552562501.976:27): pid=7642 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[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.0.31' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 50.448780] kasan: CONFIG_KASAN_INLINE enabled [ 50.453527] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 50.460889] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 50.467111] CPU: 1 PID: 7793 Comm: syz-executor452 Not tainted 5.0.0+ #97 [ 50.474032] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 50.483383] RIP: 0010:__list_del_entry_valid+0x85/0xf5 [ 50.488647] Code: 0f 84 e1 00 00 00 48 b8 00 02 00 00 00 00 ad de 49 39 c4 0f 84 e2 00 00 00 48 b8 00 00 00 00 00 fc ff df 4c 89 e2 48 c1 ea 03 <80> 3c 02 00 75 53 49 8b 14 24 4c 39 f2 0f 85 99 00 00 00 49 8d 7d [ 50.507545] RSP: 0018:ffff88809e8c6fd8 EFLAGS: 00010247 [ 50.512894] RAX: dffffc0000000000 RBX: ffff88808fdd6d10 RCX: ffffffff86799d9f [ 50.520146] RDX: 0000000000000000 RSI: ffffffff86815d20 RDI: ffff88808fdd6d18 [ 50.527399] RBP: ffff88809e8c6ff0 R08: ffff888091bc0080 R09: 0000000000000002 [ 50.534653] R10: ffffed1015d25bcf R11: ffff8880ae92de7b R12: 0000000000000006 [ 50.541952] R13: 0000000100000000 R14: ffff88808fdd6d10 R15: ffff88809e8c7198 [ 50.549213] FS: 0000000000fad880(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000 [ 50.557445] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 50.563396] CR2: 0000000020000080 CR3: 00000000a1385000 CR4: 00000000001406e0 [ 50.570649] Call Trace: [ 50.573227] sctp_sched_dequeue_common+0x28/0x340 [ 50.578072] sctp_sched_prio_dequeue+0xec/0x1a0 [ 50.582756] sctp_outq_flush+0xba2/0x2790 [ 50.586906] ? rcu_lockdep_current_cpu_online+0xe3/0x130 [ 50.592339] ? sctp_chunkify+0x4b/0x290 [ 50.596302] ? __sctp_outq_teardown+0xc60/0xc60 [ 50.600968] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 50.606488] ? sctp_outq_tail+0x681/0x930 [ 50.610618] sctp_outq_uncork+0x6c/0x80 [ 50.614579] sctp_do_sm+0x513/0x5390 [ 50.618286] ? __lock_acquire+0x53b/0x4700 [ 50.622504] ? __sys_sendmsg+0x105/0x1d0 [ 50.626553] ? sctp_do_8_2_transport_strike.isra.0+0x940/0x940 [ 50.632510] ? mark_held_locks+0x100/0x100 [ 50.636736] ? sctp_assoc_bh_rcv+0x2fc/0x660 [ 50.641143] ? find_held_lock+0x35/0x130 [ 50.645189] ? sctp_assoc_bh_rcv+0x2fc/0x660 [ 50.649587] ? kvm_clock_read+0x18/0x30 [ 50.653551] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 50.658548] ? ktime_get+0x208/0x300 [ 50.662245] sctp_assoc_bh_rcv+0x343/0x660 [ 50.666471] sctp_inq_push+0x1ea/0x290 [ 50.670355] sctp_backlog_rcv+0x189/0xbc0 [ 50.674487] ? __local_bh_enable_ip+0x15a/0x270 [ 50.679143] ? sctp_hash_obj+0x5e0/0x5e0 [ 50.683187] ? __release_sock+0xca/0x3a0 [ 50.687229] ? __local_bh_enable_ip+0x15a/0x270 [ 50.691880] __release_sock+0x12e/0x3a0 [ 50.695841] release_sock+0x59/0x1c0 [ 50.699538] sctp_wait_for_connect+0x316/0x540 [ 50.704101] ? sctp_get_port+0x180/0x180 [ 50.708144] ? finish_wait+0x260/0x260 [ 50.712014] ? sctp_datamsg_put+0x36/0x4d0 [ 50.716233] ? sctp_primitive_SEND+0xa0/0xd0 [ 50.720623] sctp_sendmsg_to_asoc+0x13e2/0x17d0 [ 50.725283] ? sctp_clear_owner_w+0x120/0x120 [ 50.729759] ? sctp_autobind+0x1f0/0x1f0 [ 50.733803] ? lock_downgrade+0x810/0x810 [ 50.737933] ? kasan_check_read+0x11/0x20 [ 50.742062] sctp_sendmsg+0x10a9/0x17e0 [ 50.746023] ? sctp_id2assoc+0x2c0/0x2c0 [ 50.750066] ? __might_sleep+0x95/0x190 [ 50.754024] ? debug_lockdep_rcu_enabled+0x71/0xa0 [ 50.758940] ? aa_sk_perm+0x1c6/0x7c0 [ 50.762741] ? aa_sock_msg_perm.isra.0+0xba/0x170 [ 50.767583] inet_sendmsg+0x147/0x5d0 [ 50.771362] ? ipip_gro_receive+0x100/0x100 [ 50.775670] sock_sendmsg+0xdd/0x130 [ 50.779365] ___sys_sendmsg+0x806/0x930 [ 50.783326] ? copy_msghdr_from_user+0x430/0x430 [ 50.788066] ? _raw_spin_unlock_bh+0x31/0x40 [ 50.792459] ? release_sock+0x158/0x1c0 [ 50.796448] ? sctp_setsockopt+0x165/0x68a0 [ 50.800755] ? sctp_setsockopt_paddr_thresholds+0x540/0x540 [ 50.806457] ? lockdep_hardirqs_on+0x415/0x5d0 [ 50.811031] ? debug_lockdep_rcu_enabled+0x71/0xa0 [ 50.815943] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 50.821464] ? __fget_light+0x1a9/0x230 [ 50.825418] ? __fdget+0x1b/0x20 [ 50.828774] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 50.834299] __sys_sendmsg+0x105/0x1d0 [ 50.838176] ? __ia32_sys_shutdown+0x80/0x80 [ 50.842581] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 50.847321] ? do_syscall_64+0x26/0x610 [ 50.851279] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 50.856630] ? do_syscall_64+0x26/0x610 [ 50.860591] __x64_sys_sendmsg+0x78/0xb0 [ 50.864640] do_syscall_64+0x103/0x610 [ 50.868513] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 50.873685] RIP: 0033:0x4402a9 [ 50.876865] 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 [ 50.895755] RSP: 002b:00007fff60414978 EFLAGS: 00000246 ORIG_RAX: 000000000000002e [ 50.903456] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 00000000004402a9 [ 50.910716] RDX: 0000000000000000 RSI: 000000002001afc8 RDI: 0000000000000003 [ 50.917969] RBP: 00000000006ca018 R08: 0000000000000002 R09: 00000000004002c8 [ 50.925221] R10: 0000000000000008 R11: 0000000000000246 R12: 0000000000401b30 [ 50.932473] R13: 0000000000401bc0 R14: 0000000000000000 R15: 0000000000000000 [ 50.939727] Modules linked in: [ 50.943759] ---[ end trace 8121cdb67bdbbfc9 ]--- [ 50.948536] RIP: 0010:__list_del_entry_valid+0x85/0xf5 [ 50.953942] Code: 0f 84 e1 00 00 00 48 b8 00 02 00 00 00 00 ad de 49 39 c4 0f 84 e2 00 00 00 48 b8 00 00 00 00 00 fc ff df 4c 89 e2 48 c1 ea 03 <80> 3c 02 00 75 53 49 8b 14 24 4c 39 f2 0f 85 99 00 00 00 49 8d 7d [ 50.972924] RSP: 0018:ffff88809e8c6fd8 EFLAGS: 00010247 [ 50.978294] RAX: dffffc0000000000 RBX: ffff88808fdd6d10 RCX: ffffffff86799d9f [ 50.985605] RDX: 0000000000000000 RSI: ffffffff86815d20 RDI: ffff88808fdd6d18 [ 50.992900] RBP: ffff88809e8c6ff0 R08: ffff888091bc0080 R09: 0000000000000002 [ 51.000165] R10: ffffed1015d25bcf R11: ffff8880ae92de7b R12: 0000000000000006 [ 51.007464] R13: 0000000100000000 R14: ffff88808fdd6d10 R15: ffff88809e8c7198 [ 51.014760] FS: 0000000000fad880(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000 [ 51.023015] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 51.028894] CR2: 0000000020000080 CR3: 00000000a1385000 CR4: 00000000001406e0 [ 51.036200] Kernel panic - not syncing: Fatal exception [ 51.042235] Kernel Offset: disabled [ 51.045855] Rebooting in 86400 seconds..