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: 3393 Comm: syz-executor.4 Not tainted 4.14.149+ #0
task: 00000000c6f06407 task.stack: 00000000f21dfe03
RIP: 0010:kobject_uevent_env+0xa3/0xc60 lib/kobject_uevent.c:355
RSP: 0018:ffff8881d4ccfc08 EFLAGS: 00010206
RAX: 0000000000000018 RBX: 0000000000000002 RCX: 1ffff110336c7104
RDX: 0000000000000000 RSI: 0000000000000002 RDI: 00000000000000c0
RBP: ffff8881d664aad0 R08: 0000000000000001 R09: 0000000000000003
R10: fffffbfff16c5ffd R11: ffffffff8b62ffeb R12: 00000000000000a0
R13: dffffc0000000000 R14: ffff8881d664a9c8 R15: 00000000000000a0
FS:  00000000025ef940(0000) GS:ffff8881db800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000738000 CR3: 00000001c34b6001 CR4: 00000000001606b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 loop_clr_fd+0x4ab/0xad0 drivers/block/loop.c:1059
 __lo_release drivers/block/loop.c:1649 [inline]
 lo_release+0x10d/0x1a0 drivers/block/loop.c:1667
 __blkdev_put+0x518/0x6d0 fs/block_dev.c:1791
 blkdev_close+0x86/0xb0 fs/block_dev.c:1863
 __fput+0x25e/0x710 fs/file_table.c:210
 task_work_run+0x125/0x1a0 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:164
 prepare_exit_to_usermode arch/x86/entry/common.c:199 [inline]
 syscall_return_slowpath arch/x86/entry/common.c:270 [inline]
 do_syscall_64+0x3a3/0x520 arch/x86/entry/common.c:297
 entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x413741
RSP: 002b:00007ffd278b80d0 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
RAX: 0000000000000000 RBX: 0000000000000005 RCX: 0000000000413741
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000004
RBP: 0000000000000001 R08: ffffffff810c5928 R09: 00000000ff9eddb0
R10: 00007ffd278b81b0 R11: 0000000000000293 R12: 000000000075bf20
R13: 0000000000016ebc R14: 0000000000762128 R15: 000000000075bf2c
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 e9 0a ab 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: ffff8881d4ccfc08
TCP: request_sock_TCPv6: Possible SYN flooding on port 20000. Dropping request.  Check SNMP counters.
---[ end trace 0be293e49f48b0a0 ]---