RBP: 00000000004af208 R08: 0000000000000000 R09: 0000000000000001
R10: 0000000000000000 R11: 0000000000000293 R12: 00000000006dcc38
R13: 0000000000000000 R14: 0000000000000010 R15: 0030656c69662f2e
------------[ cut here ]------------
sysfs group 'loop' not found for kobject 'loop0'
WARNING: CPU: 0 PID: 4498 at fs/sysfs/group.c:235 sysfs_remove_group+0x15b/0x1b0 fs/sysfs/group.c:233
FAULT_INJECTION: forcing a failure.
name fail_futex, interval 1, probability 0, space 0, times 1
Kernel panic - not syncing: panic_on_warn set ...

CPU: 0 PID: 4498 Comm: syz-executor500 Not tainted 4.17.0-rc5+ #54
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:ffff8801ace67848 EFLAGS: 00010286
RAX: 0000000000000030 RBX: ffffffff892dc900 RCX: ffffffff8160aa5d
RDX: 0000000000000000 RSI: ffffffff8160f711 RDI: ffff8801ace673a8
RBP: ffff8801ace67870 R08: ffff8801aebde3c0 R09: 0000000000000006
R10: ffff8801aebde3c0 R11: 0000000000000000 R12: 0000000000000000
R13: ffff8801d28202a0 R14: ffffffff88279e00 R15: ffff8801d2e6ec28
 loop_sysfs_exit drivers/block/loop.c:820 [inline]
 loop_clr_fd+0x51e/0xb80 drivers/block/loop.c:1073
 lo_ioctl+0x642/0x2130 drivers/block/loop.c:1404
 __blkdev_driver_ioctl block/ioctl.c:303 [inline]
 blkdev_ioctl+0x9b6/0x2020 block/ioctl.c:601
 block_ioctl+0xee/0x130 fs/block_dev.c:1877
 vfs_ioctl fs/ioctl.c:46 [inline]
 file_ioctl fs/ioctl.c:500 [inline]
 do_vfs_ioctl+0x1cf/0x16a0 fs/ioctl.c:684
 ksys_ioctl+0xa9/0xd0 fs/ioctl.c:701
 __do_sys_ioctl fs/ioctl.c:708 [inline]
 __se_sys_ioctl fs/ioctl.c:706 [inline]
 __x64_sys_ioctl+0x73/0xb0 fs/ioctl.c:706
 do_syscall_64+0x1b1/0x800 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x445e37
RSP: 002b:00007fc68d460d38 EFLAGS: 00000203 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00000000006dcc24 RCX: 0000000000445e37
RDX: 0000000000000000 RSI: 0000000000004c01 RDI: 0000000000000017
RBP: 00007fc68d460d50 R08: 0000000020000240 R09: 000000000000000a
R10: 0000000000000000 R11: 0000000000000203 R12: 00000000006dcc20
R13: 0000000000000016 R14: 0000000000000016 R15: 0030656c69662f2e
CPU: 1 PID: 4501 Comm: syz-executor500 Not tainted 4.17.0-rc5+ #54
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
 fail_dump lib/fault-inject.c:51 [inline]
 should_fail.cold.4+0xa/0x1a lib/fault-inject.c:149
 should_fail_futex kernel/futex.c:306 [inline]
 get_futex_key+0x181f/0x1e90 kernel/futex.c:626
 futex_wait_setup+0xd1/0x400 kernel/futex.c:2577
 futex_wait+0x40d/0x9f0 kernel/futex.c:2640
 do_futex+0x336/0x27d0 kernel/futex.c:3527
 __do_sys_futex kernel/futex.c:3587 [inline]
 __se_sys_futex kernel/futex.c:3555 [inline]
 __x64_sys_futex+0x46a/0x680 kernel/futex.c:3555
 do_syscall_64+0x1b1/0x800 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x445f49
RSP: 002b:00007fc68d43fd38 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: ffffffffffffffda RBX: 00000000006dcc3c RCX: 0000000000445f49
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00000000006dcc3c
RBP: 00007fc68d43fd50 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000006dcc38
R13: 0000000000000000 R14: 0000000000000018 R15: 0030656c69662f2e
Dumping ftrace buffer:
   (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..