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: 6834 Comm: syz-executor.0 Not tainted 4.14.160-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8880a9bf8240 task.stack: ffff88807fd08000
RIP: 0010:kobject_uevent_env+0x91/0xaa7 lib/kobject_uevent.c:350
RSP: 0018:ffff88807fd0fa98 EFLAGS: 00010286
RAX: dffffc0000000000 RBX: 0000000000000002 RCX: 1ffff1101537f156
RDX: 0000000000000014 RSI: 0000000000000002 RDI: ffffffff872645f0
RBP: ffff88807fd0fb18 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000028 R11: ffff8880a9bf8240 R12: ffff888093712800
R13: ffff888081183900 R14: 00000000000000a0 R15: ffff888097832328
FS:  0000000001004940(0000) GS:ffff8880aef00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f56a634ea20 CR3: 000000007ff1d000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 kobject_uevent+0xb/0xd lib/kobject_uevent.c:553
 loop_clr_fd+0x492/0xac0 drivers/block/loop.c:1059
 lo_ioctl+0x7f7/0x1c80 drivers/block/loop.c:1414
 __blkdev_driver_ioctl block/ioctl.c:297 [inline]
 blkdev_ioctl+0x776/0x16a0 block/ioctl.c:594
 block_ioctl+0xd7/0x130 fs/block_dev.c:1881
 vfs_ioctl fs/ioctl.c:46 [inline]
 file_ioctl fs/ioctl.c:500 [inline]
 do_vfs_ioctl+0x180/0xfb0 fs/ioctl.c:684
 SYSC_ioctl fs/ioctl.c:701 [inline]
 SyS_ioctl+0x74/0x80 fs/ioctl.c:692
 do_syscall_64+0x1c7/0x5b0 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x4598c7
RSP: 002b:00007fff81f3b1e8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00000000004598c7
RDX: 0000000000000000 RSI: 0000000000004c01 RDI: 0000000000000003
RBP: 00000000000002cd R08: 0000000000000000 R09: 000000000000000a
R10: 0000000000000075 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fff81f3b220 R14: 0000000000029a24 R15: 00007fff81f3b230
Code: 8a 04 02 48 89 fa 83 e2 07 38 d0 7f 09 84 c0 74 05 e8 2a e6 66 fb 41 80 4e 3c 08 4c 89 f2 b8 ff ff 37 00 48 c1 ea 03 48 c1 e0 2a <80> 3c 02 00 74 08 4c 89 f7 e8 c7 e5 66 fb 49 8b 36 48 c7 c1 e0 
RIP: kobject_uevent_env+0x91/0xaa7 lib/kobject_uevent.c:350 RSP: ffff88807fd0fa98
---[ end trace 945f0713e063de03 ]---