overlayfs: workdir and upperdir must be separate subtrees
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
Modules linked in:
CPU: 1 PID: 1752 Comm: syz-executor.5 Not tainted 4.14.184-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff88804a6dc140 task.stack: ffff888050598000
RIP: 0010:do_con_write.part.0+0x78e/0x1a20 drivers/tty/vt/vt.c:2411
RSP: 0018:ffff88805059f920 EFLAGS: 00010203
RAX: 0000000020000001 RBX: 000000010000000e RCX: 0000000000000002
RDX: 0000000000000000 RSI: 0000000000000001 RDI: ffff88809ba627fd
RBP: 00000000000007fe R08: 0000000000000001 R09: 0000000000000000
R10: ffff88804a6dca90 R11: ffff88804a6dc140 R12: dffffc0000000000
R13: ffff88809ba6280c R14: ffff88809ba62480 R15: ffff88808ec50042
FS:  00007f869becc700(0000) GS:ffff8880aed00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005602cfb09238 CR3: 000000004a75d000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 do_con_write drivers/tty/vt/vt.c:2218 [inline]
 con_write+0x33/0xc0 drivers/tty/vt/vt.c:2798
 process_output_block drivers/tty/n_tty.c:595 [inline]
 n_tty_write+0x375/0xe20 drivers/tty/n_tty.c:2333
 do_tty_write drivers/tty/tty_io.c:959 [inline]
 tty_write+0x3f1/0x6e0 drivers/tty/tty_io.c:1043
 do_loop_readv_writev fs/read_write.c:698 [inline]
 do_loop_readv_writev fs/read_write.c:682 [inline]
 do_iter_write fs/read_write.c:956 [inline]
 do_iter_write+0x3d9/0x550 fs/read_write.c:935
 vfs_writev+0x133/0x2a0 fs/read_write.c:999
 do_writev+0xfc/0x2c0 fs/read_write.c:1034
 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x46/0xbb
RIP: 0033:0x45c1d9
RSP: 002b:00007f869becbc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000014
RAX: ffffffffffffffda RBX: 0000000000036e00 RCX: 000000000045c1d9
RDX: 0000000000000002 RSI: 00000000200000c0 RDI: 0000000000000003
RBP: 000000000078bfe0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000078bfac
R13: 00007ffe8701a1ff R14: 00007f869becc9c0 R15: 000000000078bfac
Code: 24 b2 00 00 00 66 03 6c 24 38 e8 fe b5 1a fe 48 8b 44 24 78 80 38 00 0f 85 d2 10 00 00 49 8b 9e a0 03 00 00 48 89 d8 48 c1 e8 03 <42> 0f b6 14 20 48 89 d8 83 e0 07 83 c0 01 38 d0 7c 08 84 d2 0f 
RIP: do_con_write.part.0+0x78e/0x1a20 drivers/tty/vt/vt.c:2411 RSP: ffff88805059f920
---[ end trace 7a39234ee50f33a1 ]---