print_req_error: I/O error, dev loop0, sector 0
Buffer I/O error on dev loop0, logical block 0, lost async page write
Buffer I/O error on dev loop0, logical block 1, lost async page write
------------[ cut here ]------------
sysfs group 'loop' not found for kobject 'loop0'
WARNING: CPU: 1 PID: 16350 at fs/sysfs/group.c:235 sysfs_remove_group+0x15b/0x1b0 fs/sysfs/group.c:233
Kernel panic - not syncing: panic_on_warn set ...

CPU: 1 PID: 16350 Comm: syz-executor1 Not tainted 4.17.0-rc7+ #100
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x1b9/0x294 lib/dump_stack.c:113
 panic+0x22f/0x4de kernel/panic.c:184
 __warn.cold.8+0x163/0x1b3 kernel/panic.c:536
 report_bug+0x252/0x2d0 lib/bug.c:186
 fixup_bug arch/x86/kernel/traps.c:178 [inline]
 do_error_trap+0x1de/0x490 arch/x86/kernel/traps.c:296
 do_invalid_op+0x1b/0x20 arch/x86/kernel/traps.c:315
 invalid_op+0x14/0x20 arch/x86/entry/entry_64.S:992
RIP: 0010:sysfs_remove_group+0x15b/0x1b0 fs/sysfs/group.c:233
RSP: 0018:ffff88018c72eed8 EFLAGS: 00010286
RAX: 0000000000000030 RBX: ffffffff892dd380 RCX: ffffffff8160be2d
RDX: 0000000000000000 RSI: ffffffff81610ae1 RDI: ffff88018c72ea38
RBP: ffff88018c72ef00 R08: ffff8801bb88c680 R09: 0000000000000006
R10: ffff8801bb88c680 R11: 0000000000000000 R12: 0000000000000000
R13: ffff8801b0338260 R14: ffffffff8827ac40 R15: ffff8801c5d61528
 loop_sysfs_exit drivers/block/loop.c:820 [inline]
 loop_clr_fd+0x59a/0xc10 drivers/block/loop.c:1074
 __lo_release drivers/block/loop.c:1644 [inline]
 lo_release+0x145/0x1f0 drivers/block/loop.c:1662
 __blkdev_put+0x4f6/0x830 fs/block_dev.c:1790
 blkdev_put+0x98/0x540 fs/block_dev.c:1852
 blkdev_close+0x8b/0xb0 fs/block_dev.c:1859
 __fput+0x34d/0x890 fs/file_table.c:209
 ____fput+0x15/0x20 fs/file_table.c:243
 task_work_run+0x1e4/0x290 kernel/task_work.c:113
 exit_task_work include/linux/task_work.h:22 [inline]
 do_exit+0x1aee/0x2730 kernel/exit.c:865
 do_group_exit+0x16f/0x430 kernel/exit.c:968
 get_signal+0x886/0x1960 kernel/signal.c:2482
 do_signal+0x98/0x2040 arch/x86/kernel/signal.c:810
 exit_to_usermode_loop+0x28a/0x310 arch/x86/entry/common.c:162
 prepare_exit_to_usermode arch/x86/entry/common.c:196 [inline]
 syscall_return_slowpath arch/x86/entry/common.c:265 [inline]
 do_syscall_32_irqs_on arch/x86/entry/common.c:338 [inline]
 do_fast_syscall_32+0xcc3/0xf9b arch/x86/entry/common.c:394
 entry_SYSENTER_compat+0x70/0x7f arch/x86/entry/entry_64_compat.S:139
RIP: 0023:0xf7f48cb9
RSP: 002b:00000000f5f4410c EFLAGS: 00000296 ORIG_RAX: 00000000000000f0
RAX: fffffffffffffe00 RBX: 000000000814af1c RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000292 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
Dumping ftrace buffer:
   (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..