[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 55.846729][ T23] audit: type=1800 audit(1580196239.359:25): pid=8556 uid=0 auid=4294967295 ses=4294967295 subj=_ op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 55.865775][ T23] audit: type=1800 audit(1580196239.359:26): pid=8556 uid=0 auid=4294967295 ses=4294967295 subj=_ op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 55.911125][ T23] audit: type=1800 audit(1580196239.359:27): pid=8556 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 '10.128.1.15' (ECDSA) to the list of known hosts. executing program executing program executing program executing program executing program executing program syzkaller login: [ 952.430346][ T920] INFO: task syz-executor220:8715 blocked for more than 143 seconds. [ 952.438585][ T920] Not tainted 5.5.0-syzkaller #0 [ 952.445642][ T920] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 952.454568][ T920] syz-executor220 D28328 8715 8714 0x00004004 [ 952.464735][ T920] Call Trace: [ 952.468152][ T920] __schedule+0x87f/0xcd0 [ 952.472787][ T920] schedule+0x188/0x210 [ 952.476944][ T920] schedule_preempt_disabled+0x13/0x20 [ 952.483393][ T920] __mutex_lock_common+0x11f1/0x2f30 [ 952.488755][ T920] ? hashlimit_mt_check_common+0x4da/0x1020 [ 952.494927][ T920] mutex_lock_nested+0x1b/0x30 [ 952.499689][ T920] hashlimit_mt_check_common+0x4da/0x1020 [ 952.505660][ T920] hashlimit_mt_check+0x7e/0x90 [ 952.510867][ T920] xt_check_match+0x6e0/0xb60 [ 952.515569][ T920] ? mutex_unlock+0xd/0x10 [ 952.519985][ T920] ? xt_find_match+0x23f/0x260 [ 952.525160][ T920] translate_table+0x151c/0x2230 [ 952.530179][ T920] ? __kasan_check_write+0x14/0x20 [ 952.535727][ T920] do_ipt_set_ctl+0x2c3/0x550 [ 952.540739][ T920] nf_setsockopt+0x27a/0x2a0 [ 952.545367][ T920] ip_setsockopt+0xd8/0xf0 [ 952.549773][ T920] tcp_setsockopt+0xbe/0xd0 [ 952.554671][ T920] sock_common_setsockopt+0x99/0xb0 [ 952.559877][ T920] ? sock_common_recvmsg+0x190/0x190 [ 952.565493][ T920] __sys_setsockopt+0x582/0x720 [ 952.570585][ T920] __x64_sys_setsockopt+0xbf/0xd0 [ 952.575634][ T920] do_syscall_64+0xf7/0x1c0 [ 952.580163][ T920] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 952.586489][ T920] RIP: 0033:0x441b39 [ 952.590615][ T920] Code: 2c 20 75 73 65 20 6d 6f 64 75 6c 65 20 69 6d 75 78 73 6f 63 6b 20 69 6e 73 74 65 61 64 00 00 00 00 65 72 72 6f 72 20 2d 70 20 <69> 73 20 6e 6f 20 6c 6f 6e 67 65 72 20 73 75 70 70 6f 72 74 65 64 [ 952.611355][ T920] RSP: 002b:00007ffec225f868 EFLAGS: 00000246 ORIG_RAX: 0000000000000036 [ 952.619778][ T920] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000441b39 [ 952.628048][ T920] RDX: 0000000000000040 RSI: 0004000000000000 RDI: 0000000000000003 [ 952.636284][ T920] RBP: 00000000006cc018 R08: 00000000000003a0 R09: 00000000004002c8 [ 952.644474][ T920] R10: 0000000020000440 R11: 0000000000000246 R12: 00000000004028b0 [ 952.652679][ T920] R13: 0000000000402940 R14: 0000000000000000 R15: 0000000000000000 [ 952.660885][ T920] INFO: task syz-executor220:8716 blocked for more than 143 seconds. [ 952.668938][ T920] Not tainted 5.5.0-syzkaller #0 [ 952.674745][ T920] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 952.683646][ T920] syz-executor220 D28136 8716 8713 0x00004004 [ 952.689979][ T920] Call Trace: [ 952.693563][ T920] __schedule+0x87f/0xcd0 [ 952.697909][ T920] schedule+0x188/0x210 [ 952.702345][ T920] schedule_preempt_disabled+0x13/0x20 [ 952.707798][ T920] __mutex_lock_common+0x11f1/0x2f30 [ 952.713343][ T920] ? hashlimit_mt_check_common+0x4da/0x1020 [ 952.719248][ T920] mutex_lock_nested+0x1b/0x30 [ 952.724239][ T920] hashlimit_mt_check_common+0x4da/0x1020 [ 952.729956][ T920] hashlimit_mt_check+0x7e/0x90 [ 952.735067][ T920] xt_check_match+0x6e0/0xb60 [ 952.739746][ T920] ? mutex_unlock+0xd/0x10 [ 952.745123][ T920] ? xt_find_match+0x23f/0x260 [ 952.749892][ T920] translate_table+0x151c/0x2230 [ 952.755091][ T920] ? __kasan_check_write+0x14/0x20 [ 952.760425][ T920] do_ipt_set_ctl+0x2c3/0x550 [ 952.765107][ T920] nf_setsockopt+0x27a/0x2a0 [ 952.769690][ T920] ip_setsockopt+0xd8/0xf0 [ 952.774372][ T920] tcp_setsockopt+0xbe/0xd0 [ 952.778877][ T920] sock_common_setsockopt+0x99/0xb0 [ 952.784304][ T920] ? sock_common_recvmsg+0x190/0x190 [ 952.789585][ T920] __sys_setsockopt+0x582/0x720 [ 952.794935][ T920] __x64_sys_setsockopt+0xbf/0xd0 [ 952.799962][ T920] do_syscall_64+0xf7/0x1c0 [ 952.804688][ T920] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 952.810874][ T920] RIP: 0033:0x441b39 [ 952.814770][ T920] Code: 2c 20 75 73 65 20 6d 6f 64 75 6c 65 20 69 6d 75 78 73 6f 63 6b 20 69 6e 73 74 65 61 64 00 00 00 00 65 72 72 6f 72 20 2d 70 20 <69> 73 20 6e 6f 20 6c 6f 6e 67 65 72 20 73 75 70 70 6f 72 74 65 64 [ 952.834692][ T920] RSP: 002b:00007ffec225f868 EFLAGS: 00000246 ORIG_RAX: 0000000000000036 [ 952.843324][ T920] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000441b39 [ 952.851515][ T920] RDX: 0000000000000040 RSI: 0004000000000000 RDI: 0000000000000003 [ 952.859481][ T920] RBP: 00000000006cc018 R08: 00000000000003a0 R09: 00000000004002c8 [ 952.867761][ T920] R10: 0000000020000440 R11: 0000000000000246 R12: 00000000004028b0 [ 952.877018][ T920] R13: 0000000000402940 R14: 0000000000000000 R15: 0000000000000000 [ 952.885415][ T920] INFO: task syz-executor220:8717 blocked for more than 143 seconds. [ 952.893714][ T920] Not tainted 5.5.0-syzkaller #0 [ 952.899164][ T920] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 952.908055][ T920] syz-executor220 D28328 8717 8711 0x00004004 [ 952.914613][ T920] Call Trace: [ 952.917900][ T920] __schedule+0x87f/0xcd0 [ 952.922491][ T920] schedule+0x188/0x210 [ 952.926644][ T920] schedule_preempt_disabled+0x13/0x20 [ 952.932344][ T920] __mutex_lock_common+0x11f1/0x2f30 [ 952.937625][ T920] ? hashlimit_mt_check_common+0x4da/0x1020 [ 952.943761][ T920] mutex_lock_nested+0x1b/0x30 [ 952.948518][ T920] hashlimit_mt_check_common+0x4da/0x1020 [ 952.954484][ T920] hashlimit_mt_check+0x7e/0x90 [ 952.959327][ T920] xt_check_match+0x6e0/0xb60 [ 952.964240][ T920] ? mutex_unlock+0xd/0x10 [ 952.968652][ T920] ? xt_find_match+0x23f/0x260 [ 952.973646][ T920] translate_table+0x151c/0x2230 [ 952.978600][ T920] ? __kasan_check_write+0x14/0x20 [ 952.983951][ T920] do_ipt_set_ctl+0x2c3/0x550 [ 952.988632][ T920] nf_setsockopt+0x27a/0x2a0 [ 952.993457][ T920] ip_setsockopt+0xd8/0xf0 [ 952.997868][ T920] tcp_setsockopt+0xbe/0xd0 [ 953.003345][ T920] sock_common_setsockopt+0x99/0xb0 [ 953.008534][ T920] ? sock_common_recvmsg+0x190/0x190 [ 953.014052][ T920] __sys_setsockopt+0x582/0x720 [ 953.018904][ T920] __x64_sys_setsockopt+0xbf/0xd0 [ 953.024156][ T920] do_syscall_64+0xf7/0x1c0 [ 953.028657][ T920] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 953.034787][ T920] RIP: 0033:0x441b39 [ 953.038676][ T920] Code: 2c 20 75 73 65 20 6d 6f 64 75 6c 65 20 69 6d 75 78 73 6f 63 6b 20 69 6e 73 74 65 61 64 00 00 00 00 65 72 72 6f 72 20 2d 70 20 <69> 73 20 6e 6f 20 6c 6f 6e 67 65 72 20 73 75 70 70 6f 72 74 65 64 [ 953.058612][ T920] RSP: 002b:00007ffec225f868 EFLAGS: 00000246 ORIG_RAX: 0000000000000036 [ 953.067311][ T920] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000441b39 [ 953.075509][ T920] RDX: 0000000000000040 RSI: 0004000000000000 RDI: 0000000000000003 [ 953.083706][ T920] RBP: 00000000006cc018 R08: 00000000000003a0 R09: 00000000004002c8 [ 953.091973][ T920] R10: 0000000020000440 R11: 0000000000000246 R12: 00000000004028b0 [ 953.099940][ T920] R13: 0000000000402940 R14: 0000000000000000 R15: 0000000000000000 [ 953.108239][ T920] INFO: task syz-executor220:8718 blocked for more than 144 seconds. [ 953.116553][ T920] Not tainted 5.5.0-syzkaller #0 [ 953.122201][ T920] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 953.131824][ T920] syz-executor220 D27944 8718 8709 0x00004004 [ 953.138154][ T920] Call Trace: [ 953.141785][ T920] __schedule+0x87f/0xcd0 [ 953.146122][ T920] schedule+0x188/0x210 [ 953.150526][ T920] schedule_preempt_disabled+0x13/0x20 [ 953.155980][ T920] __mutex_lock_common+0x11f1/0x2f30 [ 953.161502][ T920] ? hashlimit_mt_check_common+0x4da/0x1020 [ 953.167399][ T920] mutex_lock_nested+0x1b/0x30 [ 953.172468][ T920] hashlimit_mt_check_common+0x4da/0x1020 [ 953.178201][ T920] hashlimit_mt_check+0x7e/0x90 [ 953.183297][ T920] xt_check_match+0x6e0/0xb60 [ 953.187980][ T920] ? mutex_unlock+0xd/0x10 [ 953.192651][ T920] ? xt_find_match+0x23f/0x260 [ 953.197424][ T920] translate_table+0x151c/0x2230 [ 953.202628][ T920] ? __kasan_check_write+0x14/0x20 [ 953.207738][ T920] do_ipt_set_ctl+0x2c3/0x550 [ 953.212673][ T920] nf_setsockopt+0x27a/0x2a0 [ 953.217314][ T920] ip_setsockopt+0xd8/0xf0 [ 953.222002][ T920] tcp_setsockopt+0xbe/0xd0 [ 953.226511][ T920] sock_common_setsockopt+0x99/0xb0 [ 953.232057][ T920] ? sock_common_recvmsg+0x190/0x190 [ 953.237345][ T920] __sys_setsockopt+0x582/0x720 [ 953.242476][ T920] __x64_sys_setsockopt+0xbf/0xd0 [ 953.247501][ T920] do_syscall_64+0xf7/0x1c0 [ 953.252261][ T920] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 953.258150][ T920] RIP: 0033:0x441b39 [ 953.263013][ T920] Code: 2c 20 75 73 65 20 6d 6f 64 75 6c 65 20 69 6d 75 78 73 6f 63 6b 20 69 6e 73 74 65 61 64 00 00 00 00 65 72 72 6f 72 20 2d 70 20 <69> 73 20 6e 6f 20 6c 6f 6e 67 65 72 20 73 75 70 70 6f 72 74 65 64 [ 953.282886][ T920] RSP: 002b:00007ffec225f868 EFLAGS: 00000246 ORIG_RAX: 0000000000000036 [ 953.291522][ T920] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000441b39 [ 953.299485][ T920] RDX: 0000000000000040 RSI: 0004000000000000 RDI: 0000000000000003 [ 953.307781][ T920] RBP: 00000000006cc018 R08: 00000000000003a0 R09: 00000000004002c8 [ 953.315974][ T920] R10: 0000000020000440 R11: 0000000000000246 R12: 00000000004028b0 [ 953.324316][ T920] R13: 0000000000402940 R14: 0000000000000000 R15: 0000000000000000 [ 953.332591][ T920] INFO: task syz-executor220:8719 blocked for more than 144 seconds. [ 953.340864][ T920] Not tainted 5.5.0-syzkaller #0 [ 953.346312][ T920] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 953.355211][ T920] syz-executor220 D28328 8719 8712 0x00004004 [ 953.361780][ T920] Call Trace: [ 953.365074][ T920] __schedule+0x87f/0xcd0 [ 953.369406][ T920] schedule+0x188/0x210 [ 953.373842][ T920] schedule_preempt_disabled+0x13/0x20 [ 953.379319][ T920] __mutex_lock_common+0x11f1/0x2f30 [ 953.384894][ T920] ? hashlimit_mt_check_common+0x4da/0x1020 [ 953.391760][ T920] mutex_lock_nested+0x1b/0x30 [ 953.396521][ T920] hashlimit_mt_check_common+0x4da/0x1020 [ 953.402483][ T920] hashlimit_mt_check+0x7e/0x90 [ 953.407331][ T920] xt_check_match+0x6e0/0xb60 [ 953.412389][ T920] ? mutex_unlock+0xd/0x10 [ 953.416808][ T920] ? xt_find_match+0x23f/0x260 [ 953.421815][ T920] translate_table+0x151c/0x2230 [ 953.426772][ T920] ? __kasan_check_write+0x14/0x20 [ 953.432133][ T920] do_ipt_set_ctl+0x2c3/0x550 [ 953.436821][ T920] nf_setsockopt+0x27a/0x2a0 [ 953.441655][ T920] ip_setsockopt+0xd8/0xf0 [ 953.446068][ T920] tcp_setsockopt+0xbe/0xd0 [ 953.450792][ T920] sock_common_setsockopt+0x99/0xb0 [ 953.455984][ T920] ? sock_common_recvmsg+0x190/0x190 [ 953.461515][ T920] __sys_setsockopt+0x582/0x720 [ 953.466543][ T920] __x64_sys_setsockopt+0xbf/0xd0 [ 953.471866][ T920] do_syscall_64+0xf7/0x1c0 [ 953.476369][ T920] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 953.482504][ T920] RIP: 0033:0x441b39 [ 953.486388][ T920] Code: 2c 20 75 73 65 20 6d 6f 64 75 6c 65 20 69 6d 75 78 73 6f 63 6b 20 69 6e 73 74 65 61 64 00 00 00 00 65 72 72 6f 72 20 2d 70 20 <69> 73 20 6e 6f 20 6c 6f 6e 67 65 72 20 73 75 70 70 6f 72 74 65 64 [ 953.506248][ T920] RSP: 002b:00007ffec225f868 EFLAGS: 00000246 ORIG_RAX: 0000000000000036 [ 953.514992][ T920] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000441b39 [ 953.523941][ T920] RDX: 0000000000000040 RSI: 0004000000000000 RDI: 0000000000000003 [ 953.532161][ T920] RBP: 00000000006cc018 R08: 00000000000003a0 R09: 00000000004002c8 [ 953.540127][ T920] R10: 0000000020000440 R11: 0000000000000246 R12: 00000000004028b0 [ 953.548375][ T920] R13: 0000000000402940 R14: 0000000000000000 R15: 0000000000000000 [ 953.556673][ T920] [ 953.556673][ T920] Showing all locks held in the system: [ 953.564629][ T920] 1 lock held by khungtaskd/920: [ 953.569549][ T920] #0: ffffffff890d45c0 (rcu_read_lock){....}, at: rcu_lock_acquire+0x4/0x30 [ 953.578853][ T920] 1 lock held by rsyslogd/8594: [ 953.583944][ T920] #0: ffff888092b7a0e0 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0x243/0x2e0 [ 953.592982][ T920] 2 locks held by getty/8684: [ 953.597642][ T920] #0: ffff888090cca090 (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x25/0x70 [ 953.607191][ T920] #1: ffffc9000181b2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x22f/0x1bc0 [ 953.616972][ T920] 2 locks held by getty/8685: [ 953.621855][ T920] #0: ffff888090e47090 (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x25/0x70 [ 953.631632][ T920] #1: ffffc900018ab2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x22f/0x1bc0 [ 953.641424][ T920] 2 locks held by getty/8686: [ 953.646086][ T920] #0: ffff88809f7aa090 (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x25/0x70 [ 953.656281][ T920] #1: ffffc9000186b2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x22f/0x1bc0 [ 953.666131][ T920] 2 locks held by getty/8687: [ 953.671159][ T920] #0: ffff88809f090090 (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x25/0x70 [ 953.680694][ T920] #1: ffffc9000185b2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x22f/0x1bc0 [ 953.690483][ T920] 2 locks held by getty/8688: [ 953.695152][ T920] #0: ffff8880a8055090 (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x25/0x70 [ 953.704646][ T920] #1: ffffc9000188b2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x22f/0x1bc0 [ 953.714439][ T920] 2 locks held by getty/8689: [ 953.719104][ T920] #0: ffff8880a2c49090 (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x25/0x70 [ 953.728562][ T920] #1: ffffc9000189b2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x22f/0x1bc0 [ 953.738366][ T920] 2 locks held by getty/8690: [ 953.743274][ T920] #0: ffff88808ac04090 (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x25/0x70 [ 953.752746][ T920] #1: ffffc900017eb2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x22f/0x1bc0 [ 953.762531][ T920] 1 lock held by syz-executor220/8710: [ 953.767976][ T920] 1 lock held by syz-executor220/8715: [ 953.773658][ T920] #0: ffffffff893710f0 (hashlimit_mutex){+.+.}, at: hashlimit_mt_check_common+0x4da/0x1020 [ 953.784692][ T920] 1 lock held by syz-executor220/8716: [ 953.790137][ T920] #0: ffffffff893710f0 (hashlimit_mutex){+.+.}, at: hashlimit_mt_check_common+0x4da/0x1020 [ 953.800487][ T920] 1 lock held by syz-executor220/8717: [ 953.805925][ T920] #0: ffffffff893710f0 (hashlimit_mutex){+.+.}, at: hashlimit_mt_check_common+0x4da/0x1020 [ 953.816240][ T920] 1 lock held by syz-executor220/8718: [ 953.821988][ T920] #0: ffffffff893710f0 (hashlimit_mutex){+.+.}, at: hashlimit_mt_check_common+0x4da/0x1020 [ 953.832286][ T920] 1 lock held by syz-executor220/8719: [ 953.837725][ T920] #0: ffffffff893710f0 (hashlimit_mutex){+.+.}, at: hashlimit_mt_check_common+0x4da/0x1020 [ 953.848095][ T920] [ 953.850636][ T920] ============================================= [ 953.850636][ T920] [ 953.859032][ T920] NMI backtrace for cpu 0 [ 953.863398][ T920] CPU: 0 PID: 920 Comm: khungtaskd Not tainted 5.5.0-syzkaller #0 [ 953.871184][ T920] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 953.881224][ T920] Call Trace: [ 953.884569][ T920] dump_stack+0x1fb/0x318 [ 953.888891][ T920] nmi_cpu_backtrace+0xaa/0x190 [ 953.893731][ T920] ? nmi_trigger_cpumask_backtrace+0x168/0x290 [ 953.899905][ T920] ? arch_trigger_cpumask_backtrace+0x20/0x20 [ 953.905958][ T920] nmi_trigger_cpumask_backtrace+0x16f/0x290 [ 953.911930][ T920] arch_trigger_cpumask_backtrace+0x10/0x20 [ 953.917861][ T920] trigger_all_cpu_backtrace+0x17/0x20 [ 953.923309][ T920] watchdog+0xd40/0xd60 [ 953.927520][ T920] kthread+0x332/0x350 [ 953.931578][ T920] ? hungtask_pm_notify+0x50/0x50 [ 953.936593][ T920] ? kthread_blkcg+0xe0/0xe0 [ 953.941172][ T920] ret_from_fork+0x24/0x30 [ 953.945671][ T920] Sending NMI from CPU 0 to CPUs 1: [ 953.951152][ C1] NMI backtrace for cpu 1 [ 953.951156][ C1] CPU: 1 PID: 8710 Comm: syz-executor220 Not tainted 5.5.0-syzkaller #0 [ 953.951160][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 953.951163][ C1] RIP: 0010:_raw_spin_unlock_bh+0x2f/0x40 [ 953.951170][ C1] Code: 56 53 48 89 fb 48 83 c7 18 4c 8b 75 08 4c 89 f6 e8 e6 81 5e f9 48 89 df e8 1e 7b 60 f9 4c 89 f7 be 01 02 00 00 e8 a1 d2 4c f9 <5b> 41 5e 5d c3 66 90 66 2e 0f 1f 84 00 00 00 00 00 55 48 89 e5 41 [ 953.951173][ C1] RSP: 0018:ffffc90002107a18 EFLAGS: 00000286 [ 953.951178][ C1] RAX: 0000000080000000 RBX: ffffc9000dd19048 RCX: ffffffff815bda87 [ 953.951181][ C1] RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffff8880a6c76e84 [ 953.951185][ C1] RBP: ffffc90002107a28 R08: ffff8880a6c76e98 R09: fffffbfff13ccf32 [ 953.951188][ C1] R10: fffffbfff13ccf32 R11: 0000000000000000 R12: dffffc0000000000 [ 953.951191][ C1] R13: ffffc9000dd19048 R14: ffffffff86a38d98 R15: ffffc9000dd1902c [ 953.951195][ C1] FS: 000000000233f880(0000) GS:ffff8880aed00000(0000) knlGS:0000000000000000 [ 953.951197][ C1] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 953.951201][ C1] CR2: ffffffffff600400 CR3: 000000009f9ec000 CR4: 00000000001406e0 [ 953.951204][ C1] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 953.951207][ C1] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 953.951209][ C1] Call Trace: [ 953.951211][ C1] htable_put+0x4f8/0x620 [ 953.951213][ C1] ? xt_find_target+0x23f/0x260 [ 953.951216][ C1] hashlimit_mt_destroy+0x5b/0x70 [ 953.951218][ C1] ? hashlimit_mt_check+0x90/0x90 [ 953.951220][ C1] translate_table+0x1b2b/0x2230 [ 953.951222][ C1] do_ipt_set_ctl+0x2c3/0x550 [ 953.951224][ C1] nf_setsockopt+0x27a/0x2a0 [ 953.951227][ C1] ip_setsockopt+0xd8/0xf0 [ 953.951229][ C1] tcp_setsockopt+0xbe/0xd0 [ 953.951231][ C1] sock_common_setsockopt+0x99/0xb0 [ 953.951233][ C1] ? sock_common_recvmsg+0x190/0x190 [ 953.951236][ C1] __sys_setsockopt+0x582/0x720 [ 953.951238][ C1] __x64_sys_setsockopt+0xbf/0xd0 [ 953.951240][ C1] do_syscall_64+0xf7/0x1c0 [ 953.951243][ C1] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 953.951244][ C1] RIP: 0033:0x441b39 [ 953.951251][ 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 [ 953.951254][ C1] RSP: 002b:00007ffec225f868 EFLAGS: 00000246 ORIG_RAX: 0000000000000036 [ 953.951260][ C1] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000441b39 [ 953.951263][ C1] RDX: 0000000000000040 RSI: 0004000000000000 RDI: 0000000000000003 [ 953.951266][ C1] RBP: 00000000006cc018 R08: 00000000000003a0 R09: 00000000004002c8 [ 953.951269][ C1] R10: 0000000020000440 R11: 0000000000000246 R12: 00000000004028b0 [ 953.951273][ C1] R13: 0000000000402940 R14: 0000000000000000 R15: 0000000000000000 [ 953.953984][ T920] Kernel panic - not syncing: hung_task: blocked tasks [ 954.238894][ T920] CPU: 0 PID: 920 Comm: khungtaskd Not tainted 5.5.0-syzkaller #0 [ 954.246682][ T920] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 954.256726][ T920] Call Trace: [ 954.260031][ T920] dump_stack+0x1fb/0x318 [ 954.264440][ T920] panic+0x264/0x7a9 [ 954.268327][ T920] ? nmi_trigger_cpumask_backtrace+0x218/0x290 [ 954.274473][ T920] watchdog+0xd53/0xd60 [ 954.278623][ T920] kthread+0x332/0x350 [ 954.282680][ T920] ? hungtask_pm_notify+0x50/0x50 [ 954.287691][ T920] ? kthread_blkcg+0xe0/0xe0 [ 954.292269][ T920] ret_from_fork+0x24/0x30 [ 954.298033][ T920] Kernel Offset: disabled [ 954.302355][ T920] Rebooting in 86400 seconds..