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: 0 PID: 16030 Comm: syz-executor.4 Not tainted 4.14.232-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8880489724c0 task.stack: ffff888042038000
RIP: 0010:kobject_uevent_env+0xb2/0xf40 lib/kobject_uevent.c:355
RSP: 0018:ffff88804203fbf0 EFLAGS: 00010206
RAX: 0000000000000018 RBX: 0000000000000002 RCX: 1ffff1100912e5b8
RDX: 0000000000000000 RSI: 0000000000000002 RDI: 00000000000000c0
RBP: ffff8880aa82e710 R08: ffffffff8b9c9a50 R09: 0000000000000003
R10: 0000000000000000 R11: ffff8880489724c0 R12: 00000000000000a0
R13: dffffc0000000000 R14: ffff8880aa82e608 R15: 00000000000000a0
FS:  000000000332c400(0000) GS:ffff8880ba400000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000200c7000 CR3: 000000009a30d000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 loop_clr_fd+0x59f/0xc20 drivers/block/loop.c:1069
 __lo_release drivers/block/loop.c:1660 [inline]
 lo_release+0xff/0x190 drivers/block/loop.c:1678
 __blkdev_put+0x5aa/0x800 fs/block_dev.c:1803
 raw_release+0x122/0x160 drivers/char/raw.c:113
 __fput+0x25f/0x7a0 fs/file_table.c:210
 task_work_run+0x11f/0x190 kernel/task_work.c:113
 tracehook_notify_resume include/linux/tracehook.h:191 [inline]
 exit_to_usermode_loop+0x1ad/0x200 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+0x4a3/0x640 arch/x86/entry/common.c:297
 entry_SYSCALL_64_after_hwframe+0x46/0xbb
RIP: 0033:0x41940b
RSP: 002b:00007ffe6d6b90a0 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
RAX: 0000000000000000 RBX: 0000000000000004 RCX: 000000000041940b
RDX: 0000000000577a38 RSI: 00000000089075c3 RDI: 0000000000000003
RBP: 0000000000000001 R08: 0000000000000000 R09: 0000001b2f623444
R10: 00007ffe6d6b9190 R11: 0000000000000293 R12: 000000000004c26f
R13: 00000000000003e8 R14: 000000000056bf60 R15: 000000000004c216
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 ba 6e 58 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 lib/kobject_uevent.c:355 RSP: ffff88804203fbf0
---[ end trace d4130653c0b99a73 ]---