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: 1673 Comm: systemd-udevd Not tainted 4.14.218-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8880a00b0500 task.stack: ffff888074720000
RIP: 0010:kobject_uevent_env+0xb2/0xf40 syzkaller/managers/linux-4-14/kernel/lib/kobject_uevent.c:355
RSP: 0018:ffff888074727c00 EFLAGS: 00010206
RAX: 0000000000000018 RBX: 0000000000000002 RCX: 1ffff110140161c0
RDX: 0000000000000000 RSI: 0000000000000002 RDI: 00000000000000c0
RBP: ffff888076b966d0 R08: ffffffff8b9c3d10 R09: 0000000000000003
R10: 0000000000000000 R11: ffff8880a00b0500 R12: 00000000000000a0
R13: dffffc0000000000 R14: ffff888076b965c8 R15: 00000000000000a0
FS:  00007f344fdc58c0(0000) GS:ffff8880ba500000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000027e7888 CR3: 00000000a188d000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 loop_clr_fd+0x59f/0xc20 syzkaller/managers/linux-4-14/kernel/drivers/block/loop.c:1069
 __lo_release syzkaller/managers/linux-4-14/kernel/drivers/block/loop.c:1660 [inline]
 lo_release+0xff/0x190 syzkaller/managers/linux-4-14/kernel/drivers/block/loop.c:1678
 __blkdev_put+0x5aa/0x800 syzkaller/managers/linux-4-14/kernel/fs/block_dev.c:1803
 blkdev_close+0x86/0xb0 syzkaller/managers/linux-4-14/kernel/fs/block_dev.c:1875
 __fput+0x25f/0x7a0 syzkaller/managers/linux-4-14/kernel/fs/file_table.c:210
 task_work_run+0x11f/0x190 syzkaller/managers/linux-4-14/kernel/kernel/task_work.c:113
 tracehook_notify_resume syzkaller/managers/linux-4-14/kernel/./include/linux/tracehook.h:191 [inline]
 exit_to_usermode_loop+0x1ad/0x200 syzkaller/managers/linux-4-14/kernel/arch/x86/entry/common.c:164
 prepare_exit_to_usermode syzkaller/managers/linux-4-14/kernel/arch/x86/entry/common.c:199 [inline]
 syscall_return_slowpath syzkaller/managers/linux-4-14/kernel/arch/x86/entry/common.c:270 [inline]
 do_syscall_64+0x4a3/0x640 syzkaller/managers/linux-4-14/kernel/arch/x86/entry/common.c:297
 entry_SYSCALL_64_after_hwframe+0x46/0xbb
RIP: 0033:0x7f344ef0c270
RSP: 002b:00007ffd512350d8 EFLAGS: 00000246 ORIG_RAX: 0000000000000003
RAX: 0000000000000000 RBX: 0000000000000007 RCX: 00007f344ef0c270
RDX: 00007f344eef6b58 RSI: 0000000000000000 RDI: 0000000000000007
RBP: 00007f344fdc5710 R08: 000055d0b889ee60 R09: 0000000000000000
R10: 0000000000000116 R11: 0000000000000246 R12: 0000000000000002
R13: 0000000000000000 R14: 000055d0b88b0550 R15: 0000000000000007
Code: 03 42 80 3c 28 00 0f 85 e4 0b 00 00 4d 8b 64 24 18 4d 85 e4 0f 84 01 0c 00 00 e8 4a 43 5a fa 49 8d 7c 24 20 48 89 f8 48 c1 e8 03 <42> 80 3c 28 00 0f 85 db 0b 00 00 49 8b 6c 24 20 48 85 ed 74 b0 
RIP: kobject_uevent_env+0xb2/0xf40 syzkaller/managers/linux-4-14/kernel/lib/kobject_uevent.c:355 RSP: ffff888074727c00
---[ end trace 5f06d7706fcad406 ]---