kasan: CONFIG_KASAN_INLINE enabled
kasan: GPF could be caused by NULL-ptr deref or user memory access
general protection fault: 0000 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 3011 Comm: kworker/u4:4 Not tainted 4.20.0-rc1-next-20181109+ #110
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: events_unbound flush_to_ldisc
RIP: 0010:__read_once_size include/linux/compiler.h:182 [inline]
RIP: 0010:n_tty_receive_buf_common+0x15c/0x2cb0 drivers/tty/n_tty.c:1719
Code: 45 98 48 89 bd f0 fe ff ff 48 89 85 b0 fe ff ff e8 d9 44 a5 fd 48 8b 85 00 ff ff ff c6 00 00 48 8b 85 88 fe ff ff 48 c1 e8 03 <42> 80 3c 30 00 0f 85 f5 25 00 00 48 8b 85 20 ff ff ff 4c 8b a8 60
RSP: 0018:ffff8801cab97308 EFLAGS: 00010202
RAX: 000000000000044c RBX: ffff8801821d6c00 RCX: 0000000000002260
RDX: 0000000000000000 RSI: ffffffff83da63d7 RDI: ffff8801821d6fa8
RBP: ffff8801cab974b8 R08: ffff8801cab88f80 R09: 0000000000000008
R10: 0000000000002698 R11: ffff8801cab88640 R12: ffff88016e35e9bb
R13: 0000000000000000 R14: dffffc0000000000 R15: ffff88016e35e9bb
FS:  0000000000000000(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f169f32d000 CR3: 000000018312e000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 n_tty_receive_buf2+0x33/0x40 drivers/tty/n_tty.c:1775
 tty_ldisc_receive_buf+0xb0/0x190 drivers/tty/tty_buffer.c:461
 tty_port_default_receive_buf+0x115/0x180 drivers/tty/tty_port.c:38
 receive_buf drivers/tty/tty_buffer.c:481 [inline]
 flush_to_ldisc+0x3cf/0x5a0 drivers/tty/tty_buffer.c:533
 process_one_work+0xc8b/0x1c40 kernel/workqueue.c:2153
 worker_thread+0x17f/0x1390 kernel/workqueue.c:2296
 kthread+0x35a/0x440 kernel/kthread.c:246
 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352
Modules linked in:
kobject: 'loop2' (00000000c2df8d92): kobject_uevent_env
kobject: 'loop2' (00000000c2df8d92): fill_kobj_path: path = '/devices/virtual/block/loop2'
kobject: 'loop4' (000000003a1a3cc2): kobject_uevent_env
kobject: 'loop4' (000000003a1a3cc2): fill_kobj_path: path = '/devices/virtual/block/loop4'
kobject: 'loop1' (00000000e88a0cc7): kobject_uevent_env
---[ end trace c474ade83d6de6bb ]---
RIP: 0010:__read_once_size include/linux/compiler.h:182 [inline]
RIP: 0010:n_tty_receive_buf_common+0x15c/0x2cb0 drivers/tty/n_tty.c:1719
Code: 45 98 48 89 bd f0 fe ff ff 48 89 85 b0 fe ff ff e8 d9 44 a5 fd 48 8b 85 00 ff ff ff c6 00 00 48 8b 85 88 fe ff ff 48 c1 e8 03 <42> 80 3c 30 00 0f 85 f5 25 00 00 48 8b 85 20 ff ff ff 4c 8b a8 60
kobject: 'loop1' (00000000e88a0cc7): fill_kobj_path: path = '/devices/virtual/block/loop1'
RSP: 0018:ffff8801cab97308 EFLAGS: 00010202
RAX: 000000000000044c RBX: ffff8801821d6c00 RCX: 0000000000002260
RDX: 0000000000000000 RSI: ffffffff83da63d7 RDI: ffff8801821d6fa8
kobject: 'loop3' (000000003b12aaf4): kobject_uevent_env
RBP: ffff8801cab974b8 R08: ffff8801cab88f80 R09: 0000000000000008
kobject: 'loop3' (000000003b12aaf4): fill_kobj_path: path = '/devices/virtual/block/loop3'
R10: 0000000000002698 R11: ffff8801cab88640 R12: ffff88016e35e9bb
kobject: 'loop2' (00000000c2df8d92): kobject_uevent_env
R13: 0000000000000000 R14: dffffc0000000000 R15: ffff88016e35e9bb
kobject: 'loop2' (00000000c2df8d92): fill_kobj_path: path = '/devices/virtual/block/loop2'
FS:  0000000000000000(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
kobject: 'loop4' (000000003a1a3cc2): kobject_uevent_env
CR2: 00007fbea696cdb8 CR3: 00000001c520a000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400