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: 8005 Comm: syz-executor.0 Not tainted 4.14.218-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff888074c02640 task.stack: ffff888074c28000
RIP: 0010:kobject_uevent_env+0xb2/0xf40 lib/kobject_uevent.c:355
RSP: 0018:ffff888074c2fb28 EFLAGS: 00010206
RAX: 0000000000000018 RBX: 0000000000000002 RCX: 1ffff1100e9805de
RDX: 0000000000000000 RSI: 0000000000000002 RDI: 00000000000000c0
RBP: ffff88809d35bd90 R08: ffffffff8b9c85e8 R09: 0000000000000001
R10: 0000000000000000 R11: ffff888074c02640 R12: 00000000000000a0
R13: dffffc0000000000 R14: ffff88809d35bc88 R15: 00000000000000a0
FS:  000000000151c400(0000) GS:ffff8880ba400000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ff8c3a03010 CR3: 0000000075383000 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_ioctl+0x895/0x1cd0 drivers/block/loop.c:1424
 __blkdev_driver_ioctl block/ioctl.c:297 [inline]
 blkdev_ioctl+0x540/0x1830 block/ioctl.c:594
 block_ioctl+0xd9/0x120 fs/block_dev.c:1893
 vfs_ioctl fs/ioctl.c:46 [inline]
 file_ioctl fs/ioctl.c:500 [inline]
 do_vfs_ioctl+0x75a/0xff0 fs/ioctl.c:684
 SYSC_ioctl fs/ioctl.c:701 [inline]
 SyS_ioctl+0x7f/0xb0 fs/ioctl.c:692
 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x46/0xbb
RIP: 0033:0x4658c7
RSP: 002b:00007ffca5ca67a8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007ffca5ca6840 RCX: 00000000004658c7
RDX: 0000000000000000 RSI: 0000000000004c01 RDI: 0000000000000003
RBP: 0000000000000003 R08: 0000000000000000 R09: 00007ffca5ca6640
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000032
R13: 0000000000011a99 R14: 0000000000000000 R15: 00007ffca5ca6880
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 lib/kobject_uevent.c:355 RSP: ffff888074c2fb28
---[ end trace d65a7e91780b486d ]---