kasan: CONFIG_KASAN_INLINE enabled
kasan: GPF could be caused by NULL-ptr deref or user memory access
general protection fault: 0000 [#1] SMP KASAN
CPU: 1 PID: 7060 Comm: kworker/u4:5 Not tainted 4.18.0-next-20180815+ #40
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:188 [inline]
RIP: 0010:sigio_perm fs/fcntl.c:715 [inline]
RIP: 0010:send_sigio_to_task+0x1ad/0x910 fs/fcntl.c:734
kasan: CONFIG_KASAN_INLINE enabled
Code: 4c 8d b3 00 ff ff ff 48 b8 00 00 00 00 00 fc ff df 49 8d bf 58 06 00 00 4c 89 f2 48 c1 ea 03 c6 04 02 00 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 1a 07 00 00 49 8b 87 58 06 00 00 4c 89 f2 48 c1
RSP: 0018:ffff880194e66f48 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: ffff880194e670c8 RCX: ffffffff81cb31e3
RDX: 00000000000000cb RSI: ffffffff81cb2bb3 RDI: 0000000000000658
RBP: ffff880194e670f0 R08: ffff8801d88145c0 R09: ffffed003b6246d6
R10: ffffed003b6246d6 R11: ffff8801db1236b3 R12: ffff88018e4a5188
R13: 0000000000000000 R14: ffff880194e66fc8 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff8801db100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000607304 CR3: 00000001bf37b000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
kasan: GPF could be caused by NULL-ptr deref or user memory access
 send_sigio+0x36f/0x4a0 fs/fcntl.c:794
 kill_fasync_rcu fs/fcntl.c:1005 [inline]
 kill_fasync+0x32e/0x640 fs/fcntl.c:1019
 __receive_buf drivers/tty/n_tty.c:1645 [inline]
 n_tty_receive_buf_common+0xfb2/0x2c70 drivers/tty/n_tty.c:1727
 n_tty_receive_buf2+0x33/0x40 drivers/tty/n_tty.c:1762
 tty_ldisc_receive_buf+0xb0/0x190 drivers/tty/tty_buffer.c:456
 tty_port_default_receive_buf+0x115/0x180 drivers/tty/tty_port.c:38
 receive_buf drivers/tty/tty_buffer.c:475 [inline]
 flush_to_ldisc+0x3fd/0x570 drivers/tty/tty_buffer.c:524
 process_one_work+0xc73/0x1aa0 kernel/workqueue.c:2153
 worker_thread+0x189/0x13c0 kernel/workqueue.c:2296
 kthread+0x35a/0x420 kernel/kthread.c:246
 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:415
Modules linked in:
Dumping ftrace buffer:
   (ftrace buffer empty)
general protection fault: 0000 [#2] SMP KASAN
---[ end trace 33f2325b2ca214b6 ]---
CPU: 0 PID: 55 Comm: kworker/u4:2 Tainted: G      D           4.18.0-next-20180815+ #40
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:188 [inline]
RIP: 0010:sigio_perm fs/fcntl.c:715 [inline]
RIP: 0010:send_sigio_to_task+0x1ad/0x910 fs/fcntl.c:734
RIP: 0010:__read_once_size include/linux/compiler.h:188 [inline]
RIP: 0010:sigio_perm fs/fcntl.c:715 [inline]
RIP: 0010:send_sigio_to_task+0x1ad/0x910 fs/fcntl.c:734
Code: 4c 8d b3 00 ff ff ff 48 b8 00 00 00 00 00 fc ff df 49 8d bf 58 06 00 00 4c 89 f2 48 c1 ea 03 c6 04 02 00 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 1a 07 00 00 49 8b 87 58 06 00 00 4c 89 f2 48 c1
Code: 4c 8d b3 00 ff ff ff 48 b8 00 00 00 00 00 fc ff df 49 8d bf 58 06 00 00 4c 89 f2 48 c1 ea 03 c6 04 02 00 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 1a 07 00 00 49 8b 87 58 06 00 00 4c 89 f2 48 c1
RSP: 0018:ffff8801d9a3eec0 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: ffff8801d9a3f040 RCX: ffffffff81cb2b88
RDX: 00000000000000cb RSI: ffffffff81cb2bb3 RDI: 0000000000000658
RSP: 0018:ffff880194e66f48 EFLAGS: 00010202
RBP: ffff8801d9a3f068 R08: ffff8801d9a2e6c0 R09: 0000000000000000
R10: ffffed0031c94a31 R11: ffff88018e4a518b R12: ffff88018e4a5188
R13: 0000000000000000 R14: ffff8801d9a3ef40 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff8801db000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000001130978 CR3: 000000019995a000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000020000000 DR2: 0000000000000000
RAX: dffffc0000000000 RBX: ffff880194e670c8 RCX: ffffffff81cb31e3
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
RDX: 00000000000000cb RSI: ffffffff81cb2bb3 RDI: 0000000000000658
RBP: ffff880194e670f0 R08: ffff8801d88145c0 R09: ffffed003b6246d6
R10: ffffed003b6246d6 R11: ffff8801db1236b3 R12: ffff88018e4a5188
R13: 0000000000000000 R14: ffff880194e66fc8 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff8801db100000(0000) knlGS:0000000000000000
 send_sigio+0x36f/0x4a0 fs/fcntl.c:794
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000607304 CR3: 00000001bf37b000 CR4: 00000000001406e0
 kill_fasync_rcu fs/fcntl.c:1005 [inline]
 kill_fasync+0x32e/0x640 fs/fcntl.c:1019
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
 n_tty_write_wakeup+0x2b/0x30 drivers/tty/n_tty.c:233