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: 13557 Comm: syz-executor.4 Not tainted 4.14.106+ #30
task: ffff888187aede00 task.stack: ffff88816e528000
RIP: 0010:kobject_uevent_env+0x62/0xc60 lib/kobject_uevent.c:348
RSP: 0018:ffff88816e52fc10 EFLAGS: 00010206
RAX: 0000000000000018 RBX: 0000000000000002 RCX: 1ffff11030f5dcc4
RDX: 0000000000000000 RSI: 0000000000000002 RDI: 00000000000000c0
RBP: ffff8881da83dcd0 R08: 0000000000000001 R09: 0000000000000003
R10: ffff888187aee6a8 R11: 0000000000000001 R12: 00000000000000a0
R13: dffffc0000000000 R14: ffff8881da83dc48 R15: 00000000000000a0
FS:  00000000018cb940(0000) GS:ffff8881dba00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000020a3e58 CR3: 000000016dd84002 CR4: 00000000001606b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600
Call Trace:
 loop_clr_fd+0x49e/0xac0 drivers/block/loop.c:1060
 __lo_release drivers/block/loop.c:1650 [inline]
 lo_release+0xfc/0x190 drivers/block/loop.c:1668
 __blkdev_put+0x518/0x6d0 fs/block_dev.c:1791
 blkdev_close+0x86/0xb0 fs/block_dev.c:1863
 __fput+0x25e/0x700 fs/file_table.c:210
 task_work_run+0x118/0x190 kernel/task_work.c:113
 tracehook_notify_resume include/linux/tracehook.h:191 [inline]
 exit_to_usermode_loop+0x13b/0x160 arch/x86/entry/common.c:163
 prepare_exit_to_usermode arch/x86/entry/common.c:198 [inline]
 syscall_return_slowpath arch/x86/entry/common.c:267 [inline]
 do_syscall_64+0x372/0x4b0 arch/x86/entry/common.c:294
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 9a 73 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: ffff88816e52fc10
---[ end trace 0467c3424a7afeb3 ]---