[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 39.501782] audit: type=1800 audit(1545815605.322:25): pid=7781 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 39.542063] audit: type=1800 audit(1545815605.332:26): pid=7781 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 39.576641] audit: type=1800 audit(1545815605.332:27): pid=7781 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 '10.128.15.206' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 52.846231] ------------[ cut here ]------------ [ 52.851088] do not call blocking ops when !TASK_RUNNING; state=1 set at [<00000000b77d0bb9>] n_hdlc_tty_read+0x301/0x7f0 [ 52.862331] WARNING: CPU: 0 PID: 7931 at kernel/sched/core.c:6099 __might_sleep+0x13d/0x190 [ 52.870816] Kernel panic - not syncing: panic_on_warn set ... [ 52.876684] CPU: 0 PID: 7931 Comm: syz-executor965 Not tainted 4.20.0+ #388 [ 52.883770] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 52.893102] Call Trace: [ 52.895686] dump_stack+0x1d3/0x2c6 [ 52.899305] ? dump_stack_print_info.cold.1+0x20/0x20 [ 52.904487] panic+0x2ad/0x55c [ 52.907662] ? add_taint.cold.5+0x16/0x16 [ 52.911805] ? __warn.cold.8+0x5/0x45 [ 52.915601] ? __warn+0xe8/0x1d0 [ 52.919158] ? __might_sleep+0x13d/0x190 [ 52.923203] __warn.cold.8+0x20/0x45 [ 52.926899] ? rcu_softirq_qs+0x20/0x20 [ 52.930875] ? __might_sleep+0x13d/0x190 [ 52.934936] report_bug+0x254/0x2d0 [ 52.938588] do_error_trap+0x11b/0x200 [ 52.942457] do_invalid_op+0x36/0x40 [ 52.946147] ? __might_sleep+0x13d/0x190 [ 52.950202] invalid_op+0x14/0x20 [ 52.953637] RIP: 0010:__might_sleep+0x13d/0x190 [ 52.958290] 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 e0 2a 88 e8 43 27 f3 ff <0f> 0b e9 43 ff ff ff e8 f7 7e 6c 00 e9 26 ff ff ff e8 ed 7e 6c 00 [ 52.977172] RSP: 0018:ffff8881d9337948 EFLAGS: 00010286 [ 52.982513] RAX: 0000000000000000 RBX: ffff8881b8632240 RCX: 0000000000000000 [ 52.989764] RDX: 0000000000000000 RSI: ffffffff8164e075 RDI: 0000000000000005 [ 52.997015] RBP: ffff8881d9337978 R08: ffff8881b8632240 R09: 0000000000000007 [ 53.004268] R10: 0000000000000000 R11: ffff8881b8632240 R12: ffffffff8860b220 [ 53.011519] R13: 0000000000000019 R14: 0000000000000000 R15: ffff8881b8632240 [ 53.018783] ? vprintk_func+0x85/0x181 [ 53.022657] ? __might_sleep+0x13d/0x190 [ 53.026708] __might_fault+0xc6/0x1e0 [ 53.030536] _copy_to_user+0x30/0x110 [ 53.034320] n_hdlc_tty_read+0x5c1/0x7f0 [ 53.038371] ? n_hdlc_tty_poll+0x5f0/0x5f0 [ 53.042607] ? wake_up_q+0x100/0x100 [ 53.046303] ? ldsem_down_read+0x32/0x40 [ 53.050348] ? ldsem_down_read+0x32/0x40 [ 53.054393] tty_read+0x194/0x2a0 [ 53.057827] ? n_hdlc_tty_poll+0x5f0/0x5f0 [ 53.062050] __vfs_read+0x117/0x9b0 [ 53.065660] ? debug_lockdep_rcu_enabled+0x77/0x90 [ 53.070576] ? tty_poll+0x1a0/0x1a0 [ 53.074184] ? vfs_copy_file_range+0xb90/0xb90 [ 53.078751] ? apparmor_path_rmdir+0x30/0x30 [ 53.083141] ? tty_vhangup+0x30/0x30 [ 53.086848] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 53.092368] ? do_vfs_ioctl+0x201/0x1790 [ 53.096413] ? apparmor_file_permission+0x24/0x30 [ 53.101240] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 53.106767] ? security_file_permission+0x1c2/0x230 [ 53.111770] ? rw_verify_area+0x118/0x360 [ 53.115902] vfs_read+0x17f/0x3c0 [ 53.119340] ksys_read+0x101/0x260 [ 53.122871] ? kernel_write+0x120/0x120 [ 53.126834] ? __bpf_trace_preemptirq_template+0x30/0x30 [ 53.132276] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 53.137795] ? ksys_ioctl+0x81/0xd0 [ 53.141403] __x64_sys_read+0x73/0xb0 [ 53.145187] do_syscall_64+0x1b9/0x820 [ 53.149057] ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe [ 53.154415] ? syscall_return_slowpath+0x5e0/0x5e0 [ 53.159325] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 53.164172] ? trace_hardirqs_on_caller+0x310/0x310 [ 53.169171] ? prepare_exit_to_usermode+0x3b0/0x3b0 [ 53.174169] ? prepare_exit_to_usermode+0x291/0x3b0 [ 53.179174] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 53.184019] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 53.189190] RIP: 0033:0x440099 [ 53.192364] 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 [ 53.211261] RSP: 002b:00007ffd58610488 EFLAGS: 00000207 ORIG_RAX: 0000000000000000 [ 53.218951] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440099 [ 53.226202] RDX: 0000000000000057 RSI: 0000000020000080 RDI: 0000000000000003 [ 53.233451] RBP: 00000000006ca018 R08: 00000000004002c8 R09: 00000000004002c8 [ 53.240704] R10: 00000000004002c8 R11: 0000000000000207 R12: 0000000000401920 [ 53.247953] R13: 00000000004019b0 R14: 0000000000000000 R15: 0000000000000000 [ 53.256249] Kernel Offset: disabled [ 53.259917] Rebooting in 86400 seconds..