kasan: GPF could be caused by NULL-ptr deref or user memory access
general protection fault: 0000 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 27461 Comm: syz-executor5 Not tainted 4.19.0-rc7+ #273
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:memcmp+0x28/0x160 lib/string.c:856
Code: 00 00 48 85 d2 0f 84 0a 01 00 00 48 b8 00 00 00 00 00 fc ff df 55 48 89 f9 48 89 e5 48 c1 e9 03 41 54 53 48 89 fb 48 83 ec 18 <0f> b6 04 01 48 89 f9 83 e1 07 38 c8 7f 08 84 c0 0f 85 98 00 00 00
RSP: 0018:ffff88017f9eef98 EFLAGS: 00010292
RAX: dffffc0000000000 RBX: 1ffff1002ff3de4f RCX: 03fffe2005fe7bc9
RDX: 0000000000000002 RSI: ffffffff883ba3c0 RDI: 1ffff1002ff3de4f
RBP: ffff88017f9eefc0 R08: ffff8801ce34c6c0 R09: 0000000000000000
R10: ffffed002ff3de5a R11: 0000000000000000 R12: 0000000000000002
R13: ffffffff883ba3c0 R14: 1fff7901af92d19f R15: dffffc0000000000
FS:  00007f40261c1700(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f9839281518 CR3: 00000001cf749000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 strnstr+0x4b/0x70 lib/string.c:934
 __aa_lookupn_ns+0xc1/0x570 security/apparmor/policy_ns.c:209
kobject: 'loop3' (000000002afcd374): kobject_uevent_env
kobject: 'loop3' (000000002afcd374): fill_kobj_path: path = '/devices/virtual/block/loop3'
 aa_lookupn_ns+0x88/0x1e0 security/apparmor/policy_ns.c:240
 aa_fqlookupn_profile+0x1b9/0x1010 security/apparmor/policy.c:468
kobject: 'loop3' (000000002afcd374): kobject_uevent_env
 fqlookupn_profile+0x80/0xc0 security/apparmor/label.c:1844
 aa_label_strn_parse+0xa3a/0x1230 security/apparmor/label.c:1908
kobject: 'loop3' (000000002afcd374): fill_kobj_path: path = '/devices/virtual/block/loop3'
kobject: 'loop4' (00000000b7281e3f): kobject_uevent_env
 aa_label_parse+0x42/0x50 security/apparmor/label.c:1943
 aa_change_profile+0x513/0x3260 security/apparmor/domain.c:1362
kobject: 'loop4' (00000000b7281e3f): fill_kobj_path: path = '/devices/virtual/block/loop4'
kobject: 'loop2' (000000002ff95b10): kobject_uevent_env
kobject: 'loop2' (000000002ff95b10): fill_kobj_path: path = '/devices/virtual/block/loop2'
kobject: 'loop3' (000000002afcd374): kobject_uevent_env
kobject: 'loop3' (000000002afcd374): fill_kobj_path: path = '/devices/virtual/block/loop3'
 apparmor_setprocattr+0xaa4/0x1150 security/apparmor/lsm.c:658
 security_setprocattr+0x66/0xc0 security/security.c:1298
 proc_pid_attr_write+0x301/0x540 fs/proc/base.c:2569
 __vfs_write+0x119/0x9f0 fs/read_write.c:485
kobject: 'loop4' (00000000b7281e3f): kobject_uevent_env
kobject: 'loop4' (00000000b7281e3f): fill_kobj_path: path = '/devices/virtual/block/loop4'
 vfs_write+0x1fc/0x560 fs/read_write.c:549
 ksys_write+0x101/0x260 fs/read_write.c:598
 __do_sys_write fs/read_write.c:610 [inline]
 __se_sys_write fs/read_write.c:607 [inline]
 __x64_sys_write+0x73/0xb0 fs/read_write.c:607
 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x457579
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:00007f40261c0c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000457579
RDX: 0000000000000009 RSI: 0000000020000040 RDI: 0000000000000005
RBP: 000000000072bf00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f40261c16d4
R13: 00000000004c5502 R14: 00000000004d8e08 R15: 00000000ffffffff
Modules linked in:
kobject: 'loop0' (00000000c6fa7158): kobject_uevent_env
---[ end trace e0d14cc2e054d8d4 ]---
kobject: 'loop0' (00000000c6fa7158): fill_kobj_path: path = '/devices/virtual/block/loop0'
RIP: 0010:memcmp+0x28/0x160 lib/string.c:856
Code: 00 00 48 85 d2 0f 84 0a 01 00 00 48 b8 00 00 00 00 00 fc ff df 55 48 89 f9 48 89 e5 48 c1 e9 03 41 54 53 48 89 fb 48 83 ec 18 <0f> b6 04 01 48 89 f9 83 e1 07 38 c8 7f 08 84 c0 0f 85 98 00 00 00
RSP: 0018:ffff88017f9eef98 EFLAGS: 00010292
RAX: dffffc0000000000 RBX: 1ffff1002ff3de4f RCX: 03fffe2005fe7bc9
RDX: 0000000000000002 RSI: ffffffff883ba3c0 RDI: 1ffff1002ff3de4f
RBP: ffff88017f9eefc0 R08: ffff8801ce34c6c0 R09: 0000000000000000
R10: ffffed002ff3de5a R11: 0000000000000000 R12: 0000000000000002
R13: ffffffff883ba3c0 R14: 1fff7901af92d19f R15: dffffc0000000000
FS:  00007f40261c1700(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000000070b1b4 CR3: 00000001cf749000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400