[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 39.944999] audit: type=1800 audit(1545973944.284:25): pid=7718 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 39.982155] audit: type=1800 audit(1545973944.284:26): pid=7718 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 40.019112] audit: type=1800 audit(1545973944.284:27): pid=7718 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 '10.128.10.9' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 49.743248] ------------[ cut here ]------------ [ 49.748245] do not call blocking ops when !TASK_RUNNING; state=1 set at [<000000001fb6a004>] n_hdlc_tty_read+0x331/0x830 [ 49.759785] WARNING: CPU: 0 PID: 7869 at kernel/sched/core.c:6099 __might_sleep+0x13d/0x190 [ 49.768303] Kernel panic - not syncing: panic_on_warn set ... [ 49.774197] CPU: 0 PID: 7869 Comm: syz-executor563 Not tainted 4.20.0-rc7-next-20181224 #189 [ 49.782778] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 49.792109] Call Trace: [ 49.794695] dump_stack+0x1d3/0x2c6 [ 49.798306] ? dump_stack_print_info.cold.1+0x20/0x20 [ 49.803487] panic+0x2ad/0x632 [ 49.806661] ? add_taint.cold.5+0x16/0x16 [ 49.810800] ? __warn.cold.8+0x5/0x4f [ 49.814582] ? __warn+0xe8/0x1d0 [ 49.817959] ? __might_sleep+0x13d/0x190 [ 49.822002] __warn.cold.8+0x20/0x4f [ 49.825698] ? rcu_softirq_qs+0x20/0x20 [ 49.829671] ? __might_sleep+0x13d/0x190 [ 49.833719] report_bug+0x254/0x2d0 [ 49.837332] do_error_trap+0x11b/0x200 [ 49.841208] do_invalid_op+0x36/0x40 [ 49.844922] ? __might_sleep+0x13d/0x190 [ 49.848995] invalid_op+0x14/0x20 [ 49.852473] RIP: 0010:__might_sleep+0x13d/0x190 [ 49.857121] Code: 65 48 8b 1c 25 40 ee 01 00 48 8d 7b 10 48 89 fe 48 c1 ee 03 80 3c 06 00 75 2b 48 8b 73 10 48 c7 c7 40 f3 4a 88 e8 93 19 f3 ff <0f> 0b e9 43 ff ff ff e8 97 1e 6e 00 e9 26 ff ff ff e8 8d 1e 6e 00 [ 49.876004] RSP: 0018:ffff8880929f7948 EFLAGS: 00010286 [ 49.881348] RAX: 0000000000000000 RBX: ffff88808c4e82c0 RCX: 0000000000000000 [ 49.888600] RDX: 0000000000000000 RSI: ffffffff81683f45 RDI: 0000000000000005 [ 49.895855] RBP: ffff8880929f7978 R08: ffff88808c4e82c0 R09: ffffed1015cc5020 [ 49.903121] R10: ffffed1015cc5020 R11: ffff8880ae628107 R12: ffffffff888100c0 [ 49.910373] R13: 0000000000000019 R14: 0000000000000000 R15: ffff88808c4e82c0 [ 49.917641] ? vprintk_func+0x85/0x181 [ 49.921513] ? __might_sleep+0x13d/0x190 [ 49.925561] __might_fault+0xc6/0x1e0 [ 49.929370] _copy_to_user+0x30/0x110 [ 49.933185] n_hdlc_tty_read+0x60d/0x830 [ 49.937235] ? n_hdlc_tty_poll+0x5f0/0x5f0 [ 49.941463] ? wake_up_q+0x100/0x100 [ 49.945174] ? ldsem_down_read+0x32/0x40 [ 49.949219] ? ldsem_down_read+0x32/0x40 [ 49.953266] tty_read+0x194/0x2a0 [ 49.956698] ? n_hdlc_tty_poll+0x5f0/0x5f0 [ 49.960917] __vfs_read+0x117/0xa80 [ 49.964525] ? common_file_perm+0x236/0x7f0 [ 49.968827] ? __fget_light+0x2e9/0x430 [ 49.972781] ? tty_poll+0x1a0/0x1a0 [ 49.976390] ? vfs_copy_file_range+0xbd0/0xbd0 [ 49.980956] ? apparmor_path_rmdir+0x30/0x30 [ 49.985346] ? tty_register_driver+0xb30/0xb30 [ 49.989910] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 49.995433] ? apparmor_file_permission+0x24/0x30 [ 50.000258] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 50.005778] ? security_file_permission+0x2bc/0x320 [ 50.010778] ? rw_verify_area+0x118/0x360 [ 50.014907] vfs_read+0x17f/0x3e0 [ 50.018343] ksys_read+0x101/0x260 [ 50.021868] ? kernel_write+0x120/0x120 [ 50.025826] ? __bpf_trace_preemptirq_template+0x30/0x30 [ 50.031261] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 50.036780] ? ksys_ioctl+0x81/0xd0 [ 50.040408] __x64_sys_read+0x73/0xb0 [ 50.044213] do_syscall_64+0x1b9/0x820 [ 50.048100] ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe [ 50.053447] ? syscall_return_slowpath+0x5e0/0x5e0 [ 50.058358] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 50.063199] ? trace_hardirqs_on_caller+0x310/0x310 [ 50.068211] ? prepare_exit_to_usermode+0x3b0/0x3b0 [ 50.073263] ? prepare_exit_to_usermode+0x291/0x3b0 [ 50.078268] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 50.083096] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 50.088488] RIP: 0033:0x440099 [ 50.091665] 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 [ 50.110552] RSP: 002b:00007ffd266947a8 EFLAGS: 00000207 ORIG_RAX: 0000000000000000 [ 50.118254] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440099 [ 50.125500] RDX: 0000000000000057 RSI: 0000000020000080 RDI: 0000000000000003 [ 50.132747] RBP: 00000000006ca018 R08: 00000000004002c8 R09: 00000000004002c8 [ 50.140001] R10: 00000000004002c8 R11: 0000000000000207 R12: 0000000000401920 [ 50.147254] R13: 00000000004019b0 R14: 0000000000000000 R15: 0000000000000000 [ 50.155603] Kernel Offset: disabled [ 50.159394] Rebooting in 86400 seconds..