------------[ cut here ]------------
do not call blocking ops when !TASK_RUNNING; state=1 set at [<000000001fb6a004>] n_hdlc_tty_read+0x331/0x830 drivers/tty/n_hdlc.c:589
WARNING: CPU: 0 PID: 7869 at kernel/sched/core.c:6099 __might_sleep+0x13d/0x190 kernel/sched/core.c:6094
Kernel panic - not syncing: panic_on_warn set ...
CPU: 0 PID: 7869 Comm: syz-executor563 Not tainted 4.20.0-rc7-next-20181224 #189
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x1d3/0x2c6 lib/dump_stack.c:113
 panic+0x2ad/0x632 kernel/panic.c:214
 __warn.cold.8+0x20/0x4f kernel/panic.c:571
 report_bug+0x254/0x2d0 lib/bug.c:186
 fixup_bug arch/x86/kernel/traps.c:176 [inline]
 do_error_trap+0x11b/0x200 arch/x86/kernel/traps.c:269
 do_invalid_op+0x36/0x40 arch/x86/kernel/traps.c:288
 invalid_op+0x14/0x20 arch/x86/entry/entry_64.S:973
RIP: 0010:__might_sleep+0x13d/0x190 kernel/sched/core.c:6094
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
RSP: 0018:ffff8880929f7948 EFLAGS: 00010286
RAX: 0000000000000000 RBX: ffff88808c4e82c0 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff81683f45 RDI: 0000000000000005
RBP: ffff8880929f7978 R08: ffff88808c4e82c0 R09: ffffed1015cc5020
R10: ffffed1015cc5020 R11: ffff8880ae628107 R12: ffffffff888100c0
R13: 0000000000000019 R14: 0000000000000000 R15: ffff88808c4e82c0
 __might_fault+0xc6/0x1e0 mm/memory.c:4374
 _copy_to_user+0x30/0x110 lib/usercopy.c:25
 copy_to_user include/linux/uaccess.h:155 [inline]
 n_hdlc_tty_read+0x60d/0x830 drivers/tty/n_hdlc.c:600
 tty_read+0x194/0x2a0 drivers/tty/tty_io.c:866
 __vfs_read+0x117/0xa80 fs/read_write.c:416
 vfs_read+0x17f/0x3e0 fs/read_write.c:452
 ksys_read+0x101/0x260 fs/read_write.c:578
 __do_sys_read fs/read_write.c:588 [inline]
 __se_sys_read fs/read_write.c:586 [inline]
 __x64_sys_read+0x73/0xb0 fs/read_write.c:586
 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x440099
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
RSP: 002b:00007ffd266947a8 EFLAGS: 00000207 ORIG_RAX: 0000000000000000
RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440099
RDX: 0000000000000057 RSI: 0000000020000080 RDI: 0000000000000003
RBP: 00000000006ca018 R08: 00000000004002c8 R09: 00000000004002c8
R10: 00000000004002c8 R11: 0000000000000207 R12: 0000000000401920
R13: 00000000004019b0 R14: 0000000000000000 R15: 0000000000000000
Kernel Offset: disabled
Rebooting in 86400 seconds..