kasan: GPF could be caused by NULL-ptr deref or user memory access
general protection fault: 0000 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 10551 Comm: syz-executor2 Not tainted 4.19.0-rc4-next-20180920+ #76
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
kobject: 'integrity' (00000000917d157f): kobject_uevent_env
RIP: 0010:reconfigure_super+0x48e/0xbb0 fs/super.c:981
Code: 00 fc ff df 48 c1 ea 03 80 3c 02 00 0f 85 62 05 00 00 48 ba 00 00 00 00 00 fc ff df 48 8b 03 48 8d 78 30 48 89 f9 48 c1 e9 03 <80> 3c 11 00 0f 85 4d 05 00 00 48 8b 40 30 48 85 c0 48 89 85 20 ff
kobject: 'integrity' (00000000917d157f): kobject_uevent_env: filter function caused the event to drop!
RSP: 0018:ffff88018e0178d8 EFLAGS: 00010206
kobject: 'integrity' (00000000917d157f): kobject_cleanup, parent           (null)
RAX: 0000000000000000 RBX: ffff88018e0179f8 RCX: 0000000000000006
RDX: dffffc0000000000 RSI: ffffffff81cdb95b RDI: 0000000000000030
RBP: ffff88018e0179c8 R08: ffff880198e50700 R09: fffffbfff12c24e5
R10: fffffbfff12c24e5 R11: ffffffff8961272b R12: ffff8801be41c6c0
R13: 1ffff10031c02f20 R14: 0000000000000000 R15: ffff88018e017adc
FS:  00007fad416e8700(0000) GS:ffff8801dad00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f8dd6c1e8f0 CR3: 00000001c195f000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
kobject: 'integrity' (00000000917d157f): does not have a release() function, it is broken and must be fixed.
Call Trace:
kobject: 'integrity': free name
 do_umount_root+0x2b1/0x320 fs/namespace.c:1434
 do_umount fs/namespace.c:1504 [inline]
 ksys_umount+0x8b6/0x1230 fs/namespace.c:1620
 __do_sys_umount fs/namespace.c:1631 [inline]
 __se_sys_umount fs/namespace.c:1629 [inline]
 __x64_sys_umount+0x54/0x80 fs/namespace.c:1629
 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x457679
Code: 1d 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 eb b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007fad416e7c78 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: ffffffffffffffda RBX: 00007fad416e86d4 RCX: 0000000000457679
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000020000080
RBP: 000000000072bf00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 00000000004d81a8 R14: 00000000004c4f0c R15: 0000000000000000
Modules linked in:
kobject: '7:0' (000000007ee0057d): kobject_uevent_env
---[ end trace 2244aa12eb4f9e3b ]---
kobject: '7:0' (000000007ee0057d): fill_kobj_path: path = '/devices/virtual/bdi/7:0'
RIP: 0010:reconfigure_super+0x48e/0xbb0 fs/super.c:981
kobject: '7:0' (000000007ee0057d): kobject_cleanup, parent           (null)
Code: 00 fc ff df 48 c1 ea 03 80 3c 02 00 0f 85 62 05 00 00 48 ba 00 00 00 00 00 fc ff df 48 8b 03 48 8d 78 30 48 89 f9 48 c1 e9 03 <80> 3c 11 00 0f 85 4d 05 00 00 48 8b 40 30 48 85 c0 48 89 85 20 ff
kobject: '7:0' (000000007ee0057d): calling ktype release
RSP: 0018:ffff88018e0178d8 EFLAGS: 00010206
kobject: '7:0': free name
RAX: 0000000000000000 RBX: ffff88018e0179f8 RCX: 0000000000000006
kobject: 'mq' (0000000095aba007): kobject_uevent_env
RDX: dffffc0000000000 RSI: ffffffff81cdb95b RDI: 0000000000000030
kobject: 'mq' (0000000095aba007): kobject_uevent_env: filter function caused the event to drop!
RBP: ffff88018e0179c8 R08: ffff880198e50700 R09: fffffbfff12c24e5
kobject: 'queue' (00000000dc52a673): kobject_uevent_env
R10: fffffbfff12c24e5 R11: ffffffff8961272b R12: ffff8801be41c6c0
kobject: 'queue' (00000000dc52a673): kobject_uevent_env: filter function caused the event to drop!
R13: 1ffff10031c02f20 R14: 0000000000000000 R15: ffff88018e017adc
FS:  00007fad416e8700(0000) GS:ffff8801dac00000(0000) knlGS:0000000000000000
kobject: 'iosched' (000000001971969a): kobject_uevent_env
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
kobject: 'iosched' (000000001971969a): kobject_uevent_env: attempted to send uevent without kset!
CR2: 00007ffefb976f48 CR3: 00000001c195f000 CR4: 00000000001406f0
kobject: 'holders' (0000000031aca8e3): kobject_cleanup, parent 000000007a3abdef
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
kobject: 'holders' (0000000031aca8e3): auto cleanup kobject_del
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
kobject: 'holders' (0000000031aca8e3): calling ktype release