[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 57.110839][ T26] audit: type=1800 audit(1580258292.012:25): pid=8740 uid=0 auid=4294967295 ses=4294967295 subj=_ op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 57.130011][ T26] audit: type=1800 audit(1580258292.012:26): pid=8740 uid=0 auid=4294967295 ses=4294967295 subj=_ op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 57.178520][ T26] audit: type=1800 audit(1580258292.012:27): pid=8740 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 '10.128.0.148' (ECDSA) to the list of known hosts. executing program executing program executing program executing program executing program executing program executing program syzkaller login: [ 913.140302][ T1129] INFO: task syz-executor243:8900 blocked for more than 143 seconds. [ 913.149409][ T1129] Not tainted 5.5.0-syzkaller #0 [ 913.157235][ T1129] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 913.166560][ T1129] syz-executor243 D28424 8900 8899 0x00004004 [ 913.177360][ T1129] Call Trace: [ 913.181044][ T1129] __schedule+0x87f/0xcd0 [ 913.185442][ T1129] schedule+0x188/0x210 [ 913.189624][ T1129] schedule_preempt_disabled+0x13/0x20 [ 913.195760][ T1129] __mutex_lock_common+0x11f1/0x2f30 [ 913.201670][ T1129] ? hashlimit_mt_check_common+0x4da/0x1020 [ 913.207593][ T1129] mutex_lock_nested+0x1b/0x30 [ 913.212833][ T1129] hashlimit_mt_check_common+0x4da/0x1020 [ 913.218698][ T1129] hashlimit_mt_check_v1+0x26e/0x450 [ 913.224642][ T1129] xt_check_match+0x6e0/0xb60 [ 913.231095][ T1129] ? mutex_unlock+0xd/0x10 [ 913.235581][ T1129] ? xt_find_match+0x23f/0x260 [ 913.241937][ T1129] translate_table+0x151c/0x2230 [ 913.246967][ T1129] ? __kasan_check_write+0x14/0x20 [ 913.252656][ T1129] do_ipt_set_ctl+0x2c3/0x550 [ 913.257374][ T1129] nf_setsockopt+0x27a/0x2a0 [ 913.263434][ T1129] ip_setsockopt+0xd8/0xf0 [ 913.267897][ T1129] tcp_setsockopt+0xbe/0xd0 [ 913.272854][ T1129] sock_common_setsockopt+0x99/0xb0 [ 913.278067][ T1129] ? sock_common_recvmsg+0x190/0x190 [ 913.283727][ T1129] __sys_setsockopt+0x582/0x720 [ 913.288628][ T1129] __x64_sys_setsockopt+0xbf/0xd0 [ 913.294108][ T1129] do_syscall_64+0xf7/0x1c0 [ 913.298753][ T1129] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 913.305217][ T1129] RIP: 0033:0x441c39 [ 913.309970][ T1129] Code: 73 75 70 70 6f 72 74 65 64 20 69 6e 20 63 6f 6d 70 61 74 69 62 69 6c 69 74 79 20 6d 6f 64 65 73 20 30 20 74 6f 20 32 20 2d 20 <69> 67 6e 6f 72 65 64 0a 00 00 00 00 00 00 00 72 73 79 73 6c 6f 67 [ 913.330108][ T1129] RSP: 002b:00007ffecea54348 EFLAGS: 00000246 ORIG_RAX: 0000000000000036 [ 913.338772][ T1129] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000441c39 [ 913.347377][ T1129] RDX: 0000000000000040 RSI: 0004000000000000 RDI: 0000000000000003 [ 913.357870][ T1129] RBP: 00000000006cc018 R08: 0000000000000318 R09: 00000000004002c8 [ 913.366788][ T1129] R10: 0000000020000540 R11: 0000000000000246 R12: 00000000004029b0 [ 913.376143][ T1129] R13: 0000000000402a40 R14: 0000000000000000 R15: 0000000000000000 [ 913.385428][ T1129] INFO: task syz-executor243:8902 blocked for more than 143 seconds. [ 913.393983][ T1129] Not tainted 5.5.0-syzkaller #0 [ 913.400762][ T1129] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 913.410629][ T1129] syz-executor243 D28424 8902 8898 0x00004004 [ 913.417006][ T1129] Call Trace: [ 913.420759][ T1129] __schedule+0x87f/0xcd0 [ 913.425144][ T1129] schedule+0x188/0x210 [ 913.429479][ T1129] schedule_preempt_disabled+0x13/0x20 [ 913.435384][ T1129] __mutex_lock_common+0x11f1/0x2f30 [ 913.441177][ T1129] ? hashlimit_mt_check_common+0x4da/0x1020 [ 913.447132][ T1129] mutex_lock_nested+0x1b/0x30 [ 913.452328][ T1129] hashlimit_mt_check_common+0x4da/0x1020 [ 913.458067][ T1129] hashlimit_mt_check_v1+0x26e/0x450 [ 913.464177][ T1129] xt_check_match+0x6e0/0xb60 [ 913.469068][ T1129] ? mutex_unlock+0xd/0x10 [ 913.473973][ T1129] ? xt_find_match+0x23f/0x260 [ 913.478858][ T1129] translate_table+0x151c/0x2230 [ 913.484307][ T1129] ? __kasan_check_write+0x14/0x20 [ 913.489483][ T1129] do_ipt_set_ctl+0x2c3/0x550 [ 913.494914][ T1129] nf_setsockopt+0x27a/0x2a0 [ 913.499536][ T1129] ip_setsockopt+0xd8/0xf0 [ 913.505226][ T1129] tcp_setsockopt+0xbe/0xd0 [ 913.509785][ T1129] sock_common_setsockopt+0x99/0xb0 [ 913.515573][ T1129] ? sock_common_recvmsg+0x190/0x190 [ 913.521302][ T1129] __sys_setsockopt+0x582/0x720 [ 913.526192][ T1129] __x64_sys_setsockopt+0xbf/0xd0 [ 913.531776][ T1129] do_syscall_64+0xf7/0x1c0 [ 913.536398][ T1129] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 913.542950][ T1129] RIP: 0033:0x441c39 [ 913.546972][ T1129] Code: 73 75 70 70 6f 72 74 65 64 20 69 6e 20 63 6f 6d 70 61 74 69 62 69 6c 69 74 79 20 6d 6f 64 65 73 20 30 20 74 6f 20 32 20 2d 20 <69> 67 6e 6f 72 65 64 0a 00 00 00 00 00 00 00 72 73 79 73 6c 6f 67 [ 913.567547][ T1129] RSP: 002b:00007ffecea54348 EFLAGS: 00000246 ORIG_RAX: 0000000000000036 [ 913.576443][ T1129] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000441c39 [ 913.584879][ T1129] RDX: 0000000000000040 RSI: 0004000000000000 RDI: 0000000000000003 [ 913.593419][ T1129] RBP: 00000000006cc018 R08: 0000000000000318 R09: 00000000004002c8 [ 913.601931][ T1129] R10: 0000000020000540 R11: 0000000000000246 R12: 00000000004029b0 [ 913.611045][ T1129] R13: 0000000000402a40 R14: 0000000000000000 R15: 0000000000000000 [ 913.619263][ T1129] INFO: task syz-executor243:8903 blocked for more than 143 seconds. [ 913.627901][ T1129] Not tainted 5.5.0-syzkaller #0 [ 913.638323][ T1129] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 913.650499][ T1129] syz-executor243 D28328 8903 8894 0x00004004 [ 913.656854][ T1129] Call Trace: [ 913.660515][ T1129] __schedule+0x87f/0xcd0 [ 913.665344][ T1129] schedule+0x188/0x210 [ 913.669522][ T1129] schedule_preempt_disabled+0x13/0x20 [ 913.683276][ T1129] __mutex_lock_common+0x11f1/0x2f30 [ 913.688610][ T1129] ? hashlimit_mt_check_common+0x4da/0x1020 [ 913.695030][ T1129] mutex_lock_nested+0x1b/0x30 [ 913.699970][ T1129] hashlimit_mt_check_common+0x4da/0x1020 [ 913.706409][ T1129] hashlimit_mt_check_v1+0x26e/0x450 [ 913.712333][ T1129] xt_check_match+0x6e0/0xb60 [ 913.717042][ T1129] ? mutex_unlock+0xd/0x10 [ 913.721902][ T1129] ? xt_find_match+0x23f/0x260 [ 913.726960][ T1129] translate_table+0x151c/0x2230 [ 913.732991][ T1129] ? __kasan_check_write+0x14/0x20 [ 913.738167][ T1129] do_ipt_set_ctl+0x2c3/0x550 [ 913.743487][ T1129] nf_setsockopt+0x27a/0x2a0 [ 913.748144][ T1129] ip_setsockopt+0xd8/0xf0 [ 913.753205][ T1129] tcp_setsockopt+0xbe/0xd0 [ 913.757740][ T1129] sock_common_setsockopt+0x99/0xb0 [ 913.764306][ T1129] ? sock_common_recvmsg+0x190/0x190 [ 913.769706][ T1129] __sys_setsockopt+0x582/0x720 [ 913.775472][ T1129] __x64_sys_setsockopt+0xbf/0xd0 [ 913.780924][ T1129] do_syscall_64+0xf7/0x1c0 [ 913.785465][ T1129] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 913.791879][ T1129] RIP: 0033:0x441c39 [ 913.795800][ T1129] Code: 73 75 70 70 6f 72 74 65 64 20 69 6e 20 63 6f 6d 70 61 74 69 62 69 6c 69 74 79 20 6d 6f 64 65 73 20 30 20 74 6f 20 32 20 2d 20 <69> 67 6e 6f 72 65 64 0a 00 00 00 00 00 00 00 72 73 79 73 6c 6f 67 [ 913.816459][ T1129] RSP: 002b:00007ffecea54348 EFLAGS: 00000246 ORIG_RAX: 0000000000000036 [ 913.825647][ T1129] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000441c39 [ 913.834090][ T1129] RDX: 0000000000000040 RSI: 0004000000000000 RDI: 0000000000000003 [ 913.842844][ T1129] RBP: 00000000006cc018 R08: 0000000000000318 R09: 00000000004002c8 [ 913.852277][ T1129] R10: 0000000020000540 R11: 0000000000000246 R12: 00000000004029b0 [ 913.861178][ T1129] R13: 0000000000402a40 R14: 0000000000000000 R15: 0000000000000000 [ 913.871390][ T1129] [ 913.871390][ T1129] Showing all locks held in the system: [ 913.879232][ T1129] 1 lock held by khungtaskd/1129: [ 913.884830][ T1129] #0: ffffffff890d9bc8 (rcu_read_lock){....}, at: rcu_lock_acquire+0x4/0x30 [ 913.894941][ T1129] 1 lock held by rsyslogd/8778: [ 913.899817][ T1129] #0: ffff8880a20845e0 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0x243/0x2e0 [ 913.909093][ T1129] 2 locks held by getty/8868: [ 913.914190][ T1129] #0: ffff88809f4da090 (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x25/0x70 [ 913.924243][ T1129] #1: ffffc9000185b2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x22f/0x1bc0 [ 913.934321][ T1129] 2 locks held by getty/8869: [ 913.939012][ T1129] #0: ffff888096dde090 (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x25/0x70 [ 913.948729][ T1129] #1: ffffc9000186b2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x22f/0x1bc0 [ 913.959516][ T1129] 2 locks held by getty/8870: [ 913.965444][ T1129] #0: ffff8880a9e9c090 (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x25/0x70 [ 913.975943][ T1129] #1: ffffc9000188b2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x22f/0x1bc0 [ 913.987875][ T1129] 2 locks held by getty/8871: [ 913.993466][ T1129] #0: ffff8880945ba090 (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x25/0x70 [ 914.003963][ T1129] #1: ffffc9000183b2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x22f/0x1bc0 [ 914.014178][ T1129] 2 locks held by getty/8872: [ 914.018954][ T1129] #0: ffff88809f269090 (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x25/0x70 [ 914.029459][ T1129] #1: ffffc9000182b2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x22f/0x1bc0 [ 914.039732][ T1129] 2 locks held by getty/8873: [ 914.044885][ T1129] #0: ffff88809f5f0090 (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x25/0x70 [ 914.054813][ T1129] #1: ffffc9000187b2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x22f/0x1bc0 [ 914.064882][ T1129] 2 locks held by getty/8874: [ 914.069602][ T1129] #0: ffff8880a496d090 (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x25/0x70 [ 914.079598][ T1129] #1: ffffc900017cb2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x22f/0x1bc0 [ 914.089787][ T1129] 1 lock held by syz-executor243/8900: [ 914.095894][ T1129] #0: ffffffff893a3830 (hashlimit_mutex){+.+.}, at: hashlimit_mt_check_common+0x4da/0x1020 [ 914.106725][ T1129] 2 locks held by syz-executor243/8901: [ 914.112610][ T1129] 1 lock held by syz-executor243/8902: [ 914.118227][ T1129] #0: ffffffff893a3830 (hashlimit_mutex){+.+.}, at: hashlimit_mt_check_common+0x4da/0x1020 [ 914.129007][ T1129] 1 lock held by syz-executor243/8903: [ 914.134812][ T1129] #0: ffffffff893a3830 (hashlimit_mutex){+.+.}, at: hashlimit_mt_check_common+0x4da/0x1020 [ 914.145458][ T1129] 1 lock held by syz-executor243/8904: [ 914.152291][ T1129] #0: ffffffff893a3830 (hashlimit_mutex){+.+.}, at: hashlimit_mt_check_common+0x4da/0x1020 [ 914.162933][ T1129] 1 lock held by syz-executor243/8905: [ 914.169014][ T1129] #0: ffffffff893a3830 (hashlimit_mutex){+.+.}, at: hashlimit_mt_check_common+0x4da/0x1020 [ 914.179661][ T1129] [ 914.182508][ T1129] ============================================= [ 914.182508][ T1129] [ 914.192062][ T1129] NMI backtrace for cpu 0 [ 914.196424][ T1129] CPU: 0 PID: 1129 Comm: khungtaskd Not tainted 5.5.0-syzkaller #0 [ 914.204343][ T1129] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 914.214691][ T1129] Call Trace: [ 914.218100][ T1129] dump_stack+0x1fb/0x318 [ 914.222542][ T1129] nmi_cpu_backtrace+0xaa/0x190 [ 914.227412][ T1129] ? nmi_trigger_cpumask_backtrace+0x168/0x290 [ 914.233694][ T1129] ? arch_trigger_cpumask_backtrace+0x20/0x20 [ 914.239869][ T1129] nmi_trigger_cpumask_backtrace+0x16f/0x290 [ 914.245998][ T1129] arch_trigger_cpumask_backtrace+0x10/0x20 [ 914.251910][ T1129] trigger_all_cpu_backtrace+0x17/0x20 [ 914.257392][ T1129] watchdog+0xd40/0xd60 [ 914.261596][ T1129] kthread+0x332/0x350 [ 914.265667][ T1129] ? hungtask_pm_notify+0x50/0x50 [ 914.270974][ T1129] ? kthread_blkcg+0xe0/0xe0 [ 914.275596][ T1129] ret_from_fork+0x24/0x30 [ 914.280263][ T1129] Sending NMI from CPU 0 to CPUs 1: [ 914.285930][ C1] NMI backtrace for cpu 1 [ 914.285935][ C1] CPU: 1 PID: 8901 Comm: syz-executor243 Not tainted 5.5.0-syzkaller #0 [ 914.285939][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 914.285942][ C1] RIP: 0010:htable_put+0x2bc/0x620 [ 914.285949][ C1] Code: 8d 83 84 00 00 00 48 89 45 d0 31 c0 48 89 45 c0 4c 89 7d a0 4c 89 6d a8 66 0f 1f 44 00 00 4c 89 ef e8 78 65 59 01 48 8b 45 c0 <4c> 8d b4 c3 38 01 00 00 4c 89 f0 48 c1 e8 03 42 80 3c 20 00 74 08 [ 914.285952][ C1] RSP: 0018:ffffc90002217a40 EFLAGS: 00000286 [ 914.285957][ C1] RAX: 0000000002e9e8eb RBX: ffffc9000db19000 RCX: 0000000000000001 [ 914.285960][ C1] RDX: 0000000000000001 RSI: 0000000000000004 RDI: ffffc900022179dc [ 914.285963][ C1] RBP: ffffc90002217ab0 R08: dffffc0000000000 R09: fffff52000442f3c [ 914.285967][ C1] R10: fffff52000442f3c R11: 0000000000000000 R12: dffffc0000000000 [ 914.285970][ C1] R13: ffffc9000db19048 R14: 0000000000000000 R15: ffffc9000db1902c [ 914.285974][ C1] FS: 0000000000f36880(0000) GS:ffff8880aed00000(0000) knlGS:0000000000000000 [ 914.285977][ C1] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 914.285980][ C1] CR2: 0000000020000540 CR3: 00000000a9e89000 CR4: 00000000001406e0 [ 914.285983][ C1] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 914.285986][ C1] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 914.285988][ C1] Call Trace: [ 914.285994][ C1] hashlimit_mt_destroy_v1+0x58/0x60 [ 914.285997][ C1] ? hashlimit_mt_check_v1+0x450/0x450 [ 914.285999][ C1] translate_table+0x1b2b/0x2230 [ 914.286001][ C1] do_ipt_set_ctl+0x2c3/0x550 [ 914.286003][ C1] nf_setsockopt+0x27a/0x2a0 [ 914.286005][ C1] ip_setsockopt+0xd8/0xf0 [ 914.286007][ C1] tcp_setsockopt+0xbe/0xd0 [ 914.286010][ C1] sock_common_setsockopt+0x99/0xb0 [ 914.286012][ C1] ? sock_common_recvmsg+0x190/0x190 [ 914.286014][ C1] __sys_setsockopt+0x582/0x720 [ 914.286016][ C1] __x64_sys_setsockopt+0xbf/0xd0 [ 914.286019][ C1] do_syscall_64+0xf7/0x1c0 [ 914.286021][ C1] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 914.286023][ C1] RIP: 0033:0x441c39 [ 914.286030][ C1] Code: e8 ac 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 eb 08 fc ff c3 66 2e 0f 1f 84 00 00 00 00 [ 914.286032][ C1] RSP: 002b:00007ffecea54348 EFLAGS: 00000246 ORIG_RAX: 0000000000000036 [ 914.286038][ C1] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000441c39 [ 914.286041][ C1] RDX: 0000000000000040 RSI: 0004000000000000 RDI: 0000000000000003 [ 914.286044][ C1] RBP: 00000000006cc018 R08: 0000000000000318 R09: 00000000004002c8 [ 914.286048][ C1] R10: 0000000020000540 R11: 0000000000000246 R12: 00000000004029b0 [ 914.286051][ C1] R13: 0000000000402a40 R14: 0000000000000000 R15: 0000000000000000 [ 914.287785][ T1129] Kernel panic - not syncing: hung_task: blocked tasks [ 914.573469][ T1129] CPU: 0 PID: 1129 Comm: khungtaskd Not tainted 5.5.0-syzkaller #0 [ 914.582196][ T1129] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 914.593413][ T1129] Call Trace: [ 914.596754][ T1129] dump_stack+0x1fb/0x318 [ 914.601346][ T1129] panic+0x264/0x7a9 [ 914.605336][ T1129] ? nmi_trigger_cpumask_backtrace+0x218/0x290 [ 914.611953][ T1129] watchdog+0xd53/0xd60 [ 914.616162][ T1129] kthread+0x332/0x350 [ 914.620685][ T1129] ? hungtask_pm_notify+0x50/0x50 [ 914.628958][ T1129] ? kthread_blkcg+0xe0/0xe0 [ 914.633820][ T1129] ret_from_fork+0x24/0x30 [ 914.640102][ T1129] Kernel Offset: disabled [ 914.645253][ T1129] Rebooting in 86400 seconds..