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: 6928 Comm: syz-executor.0 Not tainted 4.14.156-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff888095dba640 task.stack: ffff888098c80000
RIP: 0010:kobject_uevent_env+0xa1/0xc23 lib/kobject_uevent.c:350
RSP: 0018:ffff888098c87ae8 EFLAGS: 00010286
RAX: dffffc0000000000 RBX: 0000000000000002 RCX: 1ffff11012bb75d6
RDX: 0000000000000014 RSI: 0000000000000002 RDI: ffffffff874f9a90
RBP: ffff888098c87b68 R08: ffff888095dba640 R09: 0000000000000001
R10: 0000000000000000 R11: ffff888095dba640 R12: 00000000000000a0
R13: 0000000000000002 R14: ffff88808f7a8080 R15: 00000000000000a0
FS:  0000000001df1940(0000) GS:ffff8880aed00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fab8631aaf0 CR3: 0000000098f99000 CR4: 00000000001426e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 kobject_uevent+0x20/0x26 lib/kobject_uevent.c:553
 loop_clr_fd+0x4a7/0xae0 drivers/block/loop.c:1059
 lo_ioctl+0x8ea/0x1ce0 drivers/block/loop.c:1414
 __blkdev_driver_ioctl block/ioctl.c:297 [inline]
 blkdev_ioctl+0x96b/0x1860 block/ioctl.c:594
 block_ioctl+0xde/0x120 fs/block_dev.c:1881
 vfs_ioctl fs/ioctl.c:46 [inline]
 file_ioctl fs/ioctl.c:500 [inline]
 do_vfs_ioctl+0x7ae/0x1060 fs/ioctl.c:684
 SYSC_ioctl fs/ioctl.c:701 [inline]
 SyS_ioctl+0x8f/0xc0 fs/ioctl.c:692
 do_syscall_64+0x1e8/0x640 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x45a4e7
RSP: 002b:00007fffb8f814a8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 000000000045a4e7
RDX: 0000000000000000 RSI: 0000000000004c01 RDI: 0000000000000003
RBP: 0000000000000732 R08: 0000000000000000 R09: 000000000000000a
R10: 0000000000000075 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fffb8f814e0 R14: 000000000009b601 R15: 00007fffb8f814f0
Code: fa 83 e2 07 38 d0 7f 09 84 c0 74 05 e8 2f 09 31 fb 41 80 4f 3c 08 e8 25 7a 06 fb 4c 89 fa b8 ff ff 37 00 48 c1 ea 03 48 c1 e0 2a <80> 3c 02 00 74 08 4c 89 ff e8 c7 08 31 fb 49 8b 37 48 c7 c1 80 
RIP: kobject_uevent_env+0xa1/0xc23 lib/kobject_uevent.c:350 RSP: ffff888098c87ae8
kobject: 'loop5' (ffff8880a40b4ca0): kobject_uevent_env
---[ end trace c6322e356ec5aa65 ]---
kobject: 'loop5' (ffff8880a40b4ca0): fill_kobj_path: path = '/devices/virtual/block/loop5'