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: 0 PID: 23890 Comm: syz-executor.0 Not tainted 4.14.156-syzkaller #0
task: 0000000033b567a6 task.stack: 000000001a1389a8
RIP: 0010:kobject_uevent_env+0xa3/0xc60 lib/kobject_uevent.c:355
RSP: 0018:ffff8881c83a7aa8 EFLAGS: 00010206
RAX: 0000000000000018 RBX: 0000000000000002 RCX: 1ffff1103944a104
RDX: 0000000000000000 RSI: 0000000000000002 RDI: 00000000000000c0
RBP: ffff8881c9c7cfd0 R08: 0000000000000001 R09: 0000000000000001
R10: fffffbfff2dc6145 R11: ffffffff96e30a2b R12: 00000000000000a0
R13: dffffc0000000000 R14: ffff8881c9c7cec8 R15: 00000000000000a0
FS:  000000000263d940(0000) GS:ffff8881dba00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 00000001c83a8001 CR4: 00000000001606b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600
Call Trace:
 loop_clr_fd+0x4ab/0xad0 drivers/block/loop.c:1059
 lo_ioctl+0x460/0x1a30 drivers/block/loop.c:1414
 __blkdev_driver_ioctl block/ioctl.c:297 [inline]
 blkdev_ioctl+0x8d0/0x1870 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/0x520 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x45a4e7
RSP: 002b:00007ffc3e0c0458 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 000000000045a4e7
RDX: 0000000000000000 RSI: 0000000000004c01 RDI: 0000000000000003
RBP: 000000000000017b R08: 0000000000000000 R09: 000000000000000a
R10: 0000000000000075 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffc3e0c0490 R14: 000000000006b947 R15: 00007ffc3e0c04a0
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 59 e1 aa 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: ffff8881c83a7aa8
---[ end trace bf14b92e6b96ccf2 ]---