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: 0 PID: 7694 Comm: syz-executor4 Not tainted 4.18.0-rc6-next-20180725+ #18 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:do_remount_sb+0x371/0x850 fs/super.c:984 Code: ff ff ff e8 91 32 1a 05 41 89 c5 48 8b 85 30 ff ff ff 48 8d b8 e0 00 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <0f> b6 04 02 84 c0 74 08 3c 03 0f 8e b5 03 00 00 48 8b 85 30 ff ff RSP: 0018:ffff88018d4a7a38 EFLAGS: 00010202 RAX: dffffc0000000000 RBX: ffff8801ad34c1c0 RCX: ffffc90006e3c000 RDX: 000000000000001c RSI: ffffffff81ee564f RDI: 00000000000000e0 RBP: ffff88018d4a7b40 R08: ffff88018f684240 R09: fffffbfff0fc24e5 R10: fffffbfff0fc24e5 R11: ffffffff87e1272b R12: ffff88018d4a7b18 R13: 0000000000000000 R14: 0000000000000001 R15: 0000000000000000 FS: 00007f19e94f4700(0000) GS:ffff8801db000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fffc551df9c CR3: 00000001a8390000 CR4: 00000000001426f0 DR0: 0000000020000000 DR1: 0000000020000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: do_umount fs/namespace.c:1490 [inline] ksys_umount+0xfa7/0x12f0 fs/namespace.c:1608 __do_sys_umount fs/namespace.c:1619 [inline] __se_sys_umount fs/namespace.c:1617 [inline] __x64_sys_umount+0x54/0x80 fs/namespace.c:1617 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x456a09 Code: fd b4 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 cb b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f19e94f3c78 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6 RAX: ffffffffffffffda RBX: 00007f19e94f46d4 RCX: 0000000000456a09 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000020000400 RBP: 00000000009301e0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000004d5c20 R14: 00000000004c936b R15: 0000000000000002 Modules linked in: Dumping ftrace buffer: (ftrace buffer empty) ---[ end trace db6b22829444816a ]--- RIP: 0010:do_remount_sb+0x371/0x850 fs/super.c:984 Code: ff ff ff e8 91 32 1a 05 41 89 c5 48 8b 85 30 ff ff ff 48 8d b8 e0 00 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <0f> b6 04 02 84 c0 74 08 3c 03 0f 8e b5 03 00 00 48 8b 85 30 ff ff RSP: 0018:ffff88018d4a7a38 EFLAGS: 00010202 RAX: dffffc0000000000 RBX: ffff8801ad34c1c0 RCX: ffffc90006e3c000 RDX: 000000000000001c RSI: ffffffff81ee564f RDI: 00000000000000e0 RBP: ffff88018d4a7b40 R08: ffff88018f684240 R09: fffffbfff0fc24e5 R10: fffffbfff0fc24e5 R11: ffffffff87e1272b R12: ffff88018d4a7b18 R13: 0000000000000000 R14: 0000000000000001 R15: 0000000000000000 FS: 00007f19e94f4700(0000) GS:ffff8801db000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fffc551df9c CR3: 00000001a8390000 CR4: 00000000001426f0 DR0: 0000000020000000 DR1: 0000000020000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400