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 NOPTI
Modules linked in:
CPU: 1 PID: 21010 Comm: blkid Not tainted 4.14.133+ #17
task: 00000000f07bbd27 task.stack: 000000004e5af0aa
RIP: 0010:kobject_uevent_env+0xa3/0xc60 /lib/kobject_uevent.c:355
RSP: 0018:ffff8881a02a7c08 EFLAGS: 00010206
RAX: 0000000000000018 RBX: 0000000000000002 RCX: 1ffff110383176e4
RDX: 0000000000000000 RSI: 0000000000000002 RDI: 00000000000000c0
RBP: ffff8881c4763cd0 R08: 0000000000000001 R09: 0000000000000003
R10: fffffbfff1545909 R11: ffffffff8aa2c84b R12: 00000000000000a0
R13: dffffc0000000000 R14: ffff8881c4763bc8 R15: 00000000000000a0
FS:  00007f664b0c6740(0000) GS:ffff8881d7700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020003040 CR3: 00000001d24ee001 CR4: 00000000001606a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 loop_clr_fd+0x4ab/0xad0 /drivers/block/loop.c:1059
 __lo_release /drivers/block/loop.c:1649 [inline]
 lo_release+0x10d/0x1a0 /drivers/block/loop.c:1667
 __blkdev_put+0x518/0x6d0 /fs/block_dev.c:1791
 blkdev_close+0x86/0xb0 /fs/block_dev.c:1863
 __fput+0x25e/0x710 /fs/file_table.c:210
 task_work_run+0x125/0x1a0 /kernel/task_work.c:113
 tracehook_notify_resume /./include/linux/tracehook.h:191 [inline]
 exit_to_usermode_loop+0x13b/0x160 /arch/x86/entry/common.c:164
 prepare_exit_to_usermode /arch/x86/entry/common.c:199 [inline]
 syscall_return_slowpath /arch/x86/entry/common.c:270 [inline]
 do_syscall_64+0x3a3/0x520 /arch/x86/entry/common.c:297
Code: 03 42 80 3c 28 00 0f 85 44 0a 00 00 4d 8b 64 24 18 4d 85 e4 0f 84 22 02 00 00 e8 c9 ed ac fe 49 8d 7c 24 20 48 89 f8 48 c1 e8 03 <42> 80 3c 28 00 0f 85 10 0a 00 00 49 8b 6c 24 20 48 85 ed 74 b0 
RIP: kobject_uevent_env+0xa3/0xc60 /lib/kobject_uevent.c:355 RSP: ffff8881a02a7c08
---[ end trace 66bba3745d7ea2dc ]---