[ 35.427711] audit: type=1800 audit(1545700017.483:26): pid=7508 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 35.465546] audit: type=1800 audit(1545700017.493:27): pid=7508 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="restorecond" dev="sda1" ino=2436 res=0 [ 35.494431] audit: type=1800 audit(1545700017.493:28): pid=7508 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="ssh" dev="sda1" ino=2417 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. [ 36.109276] audit: type=1800 audit(1545700018.193:29): pid=7508 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="rc.local" dev="sda1" ino=2432 res=0 Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.0.116' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 47.424746] ------------[ cut here ]------------ [ 47.429769] do not call blocking ops when !TASK_RUNNING; state=1 set at [<000000004df58f46>] n_hdlc_tty_read+0x301/0x7f0 [ 47.441079] WARNING: CPU: 0 PID: 7659 at kernel/sched/core.c:6099 __might_sleep+0x13d/0x190 [ 47.449564] Kernel panic - not syncing: panic_on_warn set ... [ 47.455445] CPU: 0 PID: 7659 Comm: syz-executor111 Not tainted 4.20.0 #387 [ 47.462449] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 47.471801] Call Trace: [ 47.474395] dump_stack+0x1d3/0x2c6 [ 47.478020] ? dump_stack_print_info.cold.1+0x20/0x20 [ 47.483384] panic+0x2ad/0x55c [ 47.486573] ? add_taint.cold.5+0x16/0x16 [ 47.490731] ? __warn.cold.8+0x5/0x45 [ 47.494529] ? __warn+0xe8/0x1d0 [ 47.498040] ? __might_sleep+0x13d/0x190 [ 47.502211] __warn.cold.8+0x20/0x45 [ 47.505923] ? rcu_softirq_qs+0x20/0x20 [ 47.509893] ? __might_sleep+0x13d/0x190 [ 47.513951] report_bug+0x254/0x2d0 [ 47.517578] do_error_trap+0x11b/0x200 [ 47.521632] do_invalid_op+0x36/0x40 [ 47.525341] ? __might_sleep+0x13d/0x190 [ 47.529397] invalid_op+0x14/0x20 [ 47.532840] RIP: 0010:__might_sleep+0x13d/0x190 [ 47.537507] 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 7c 6c 00 e9 26 ff ff ff e8 ed 7c 6c 00 [ 47.556412] RSP: 0018:ffff8881b8db7948 EFLAGS: 00010286 [ 47.561769] RAX: 0000000000000000 RBX: ffff8881b8cae6c0 RCX: 0000000000000000 [ 47.569033] RDX: 0000000000000000 RSI: ffffffff8164e045 RDI: 0000000000000005 [ 47.576300] RBP: ffff8881b8db7978 R08: ffff8881b8cae6c0 R09: 0000000000000007 [ 47.583564] R10: 0000000000000000 R11: ffff8881b8cae6c0 R12: ffffffff8860b220 [ 47.590827] R13: 0000000000000019 R14: 0000000000000000 R15: ffff8881b8cae6c0 [ 47.598110] ? vprintk_func+0x85/0x181 [ 47.601996] ? __might_sleep+0x13d/0x190 [ 47.606056] __might_fault+0xc6/0x1e0 [ 47.609849] _copy_to_user+0x30/0x110 [ 47.613646] n_hdlc_tty_read+0x5c1/0x7f0 [ 47.617702] ? n_hdlc_tty_poll+0x5f0/0x5f0 [ 47.622295] ? wake_up_q+0x100/0x100 [ 47.626012] ? ldsem_down_read+0x32/0x40 [ 47.630071] ? ldsem_down_read+0x32/0x40 [ 47.634389] tty_read+0x194/0x2a0 [ 47.637856] ? n_hdlc_tty_poll+0x5f0/0x5f0 [ 47.642108] __vfs_read+0x117/0x9b0 [ 47.645744] ? debug_lockdep_rcu_enabled+0x77/0x90 [ 47.650669] ? tty_poll+0x1a0/0x1a0 [ 47.654418] ? vfs_copy_file_range+0xb90/0xb90 [ 47.659001] ? apparmor_path_rmdir+0x30/0x30 [ 47.663409] ? tty_vhangup+0x30/0x30 [ 47.667127] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 47.672660] ? do_vfs_ioctl+0x201/0x1790 [ 47.676718] ? apparmor_file_permission+0x24/0x30 [ 47.681556] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 47.687095] ? security_file_permission+0x1c2/0x230 [ 47.692228] ? rw_verify_area+0x118/0x360 [ 47.696389] vfs_read+0x17f/0x3c0 [ 47.699961] ksys_read+0x101/0x260 [ 47.703528] ? kernel_write+0x120/0x120 [ 47.707502] ? __bpf_trace_preemptirq_template+0x30/0x30 [ 47.712948] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 47.718612] ? ksys_ioctl+0x81/0xd0 [ 47.722237] __x64_sys_read+0x73/0xb0 [ 47.726209] do_syscall_64+0x1b9/0x820 [ 47.730213] ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe [ 47.735579] ? syscall_return_slowpath+0x5e0/0x5e0 [ 47.740613] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 47.745463] ? trace_hardirqs_on_caller+0x310/0x310 [ 47.750473] ? prepare_exit_to_usermode+0x3b0/0x3b0 [ 47.755485] ? prepare_exit_to_usermode+0x291/0x3b0 [ 47.760529] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 47.765375] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 47.770694] RIP: 0033:0x440099 [ 47.774029] 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 [ 47.793289] RSP: 002b:00007ffeeb4e9ec8 EFLAGS: 00000207 ORIG_RAX: 0000000000000000 [ 47.800993] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440099 [ 47.808267] RDX: 0000000000000057 RSI: 0000000020000080 RDI: 0000000000000003 [ 47.815527] RBP: 00000000006ca018 R08: 00000000004002c8 R09: 00000000004002c8 [ 47.822794] R10: 00000000004002c8 R11: 0000000000000207 R12: 0000000000401920 [ 47.830059] R13: 00000000004019b0 R14: 0000000000000000 R15: 0000000000000000 [ 47.838946] Kernel Offset: disabled [ 47.842673] Rebooting in 86400 seconds..