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: 27894 Comm: syz-executor.5 Not tainted 4.14.107+ #33
task: ffff88819f0f1780 task.stack: ffff8881c1978000
RIP: 0010:kobject_uevent_env+0x62/0xc60 lib/kobject_uevent.c:348
RSP: 0018:ffff8881c197fab0 EFLAGS: 00010206
RAX: 0000000000000018 RBX: 0000000000000002 RCX: 0000000000000f9e
RDX: ffffffff82803576 RSI: ffffc9000072a000 RDI: 00000000000000c0
RBP: ffff8881bc0a9850 R08: 0000000000000001 R09: 0000000000000001
R10: ffff88819f0f1fd8 R11: 0000000000000001 R12: 00000000000000a0
R13: dffffc0000000000 R14: ffff8881bc0a97c8 R15: 00000000000000a0
FS:  00007f4261512700(0000) GS:ffff8881d7700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f42614f0db8 CR3: 000000019d568005 CR4: 00000000001606a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 loop_clr_fd+0x49e/0xac0 drivers/block/loop.c:1060
 lo_ioctl+0x813/0x1970 drivers/block/loop.c:1415
 __blkdev_driver_ioctl block/ioctl.c:297 [inline]
 blkdev_ioctl+0x4d9/0x1810 block/ioctl.c:594
 block_ioctl+0xd9/0x120 fs/block_dev.c:1881
 vfs_ioctl fs/ioctl.c:46 [inline]
 file_ioctl fs/ioctl.c:500 [inline]
 do_vfs_ioctl+0xabe/0x1040 fs/ioctl.c:684
 SYSC_ioctl fs/ioctl.c:701 [inline]
 SyS_ioctl+0x7f/0xb0 fs/ioctl.c:692
 do_syscall_64+0x19b/0x4b0 arch/x86/entry/common.c:289
Code: 03 42 80 3c 28 00 0f 85 7c 0a 00 00 4d 8b 64 24 18 4d 85 e4 0f 84 4f 02 00 00 e8 6a 70 b0 fe 49 8d 7c 24 20 48 89 f8 48 c1 e8 03 <42> 80 3c 28 00 0f 85 48 0a 00 00 49 8b 6c 24 20 48 85 ed 74 b0 
RIP: kobject_uevent_env+0x62/0xc60 lib/kobject_uevent.c:348 RSP: ffff8881c197fab0
---[ end trace e0a588d81f0c2559 ]---