------------[ cut here ]------------
do not call blocking ops when !TASK_RUNNING; state=1 set at [<000000008bc6f8d6>] n_hdlc_tty_read+0x331/0x830 drivers/tty/n_hdlc.c:589
WARNING: CPU: 1 PID: 13969 at kernel/sched/core.c:6099 __might_sleep+0x13d/0x190 kernel/sched/core.c:6094
Kernel panic - not syncing: panic_on_warn set ...
CPU: 1 PID: 13969 Comm: syz-executor3 Not tainted 4.20.0+ #396
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
kobject: 'loop4' (0000000060768568): kobject_uevent_env
 panic+0x2ad/0x55f kernel/panic.c:189
kobject: 'loop4' (0000000060768568): fill_kobj_path: path = '/devices/virtual/block/loop4'
 __warn.cold.8+0x20/0x52 kernel/panic.c:544
 report_bug+0x254/0x2d0 lib/bug.c:186
 fixup_bug arch/x86/kernel/traps.c:178 [inline]
 do_error_trap+0x11b/0x200 arch/x86/kernel/traps.c:271
 do_invalid_op+0x36/0x40 arch/x86/kernel/traps.c:290
 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 f2 4a 88 e8 03 18 f3 ff <0f> 0b e9 43 ff ff ff e8 d7 b6 6d 00 e9 26 ff ff ff e8 cd b6 6d 00
RSP: 0018:ffff888089d2f948 EFLAGS: 00010286
RAX: 0000000000000000 RBX: ffff88809e2ee5c0 RCX: ffffc9000c01e000
RDX: 000000000001603e RSI: ffffffff81683f55 RDI: 0000000000000005
RBP: ffff888089d2f978 R08: ffff88809e2ee5c0 R09: ffffed1015ce5020
R10: ffffed1015ce5020 R11: ffff8880ae728107 R12: ffffffff88809800
R13: 0000000000000019 R14: 0000000000000000 R15: ffff88809e2ee5c0
 __might_fault+0xc6/0x1e0 mm/memory.c:4358
 _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: 0033:0x457ec9
Code: 6d b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 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 3b b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f0ab4605c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000000
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000457ec9
RDX: 0000000000000034 RSI: 0000000020000000 RDI: 0000000000000003
RBP: 000000000073bfa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f0ab46066d4
R13: 00000000004c37a7 R14: 00000000004d7ae8 R15: 00000000ffffffff
kobject: 'loop4' (0000000060768568): kobject_uevent_env
Kernel Offset: disabled
Rebooting in 86400 seconds..