R13: 00000000004bdf9b R14: 00000000004cc3a8 R15: 0000000000000001 loop_reread_partitions: partition scan of loop0 () failed (rc=-13) IPVS: ftp: loaded support on port[0] = 21 ------------[ cut here ]------------ sysfs group 'loop' not found for kobject 'loop6' WARNING: CPU: 0 PID: 13244 at fs/sysfs/group.c:235 sysfs_remove_group+0x1d7/0x5f0 fs/sysfs/group.c:233 Kernel panic - not syncing: panic_on_warn set ... CPU: 0 PID: 13244 Comm: syz-executor2 Not tainted 4.17.0+ #9 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+0x185/0x1d0 lib/dump_stack.c:113 panic+0x3d0/0x990 kernel/panic.c:184 __warn+0x40f/0x580 kernel/panic.c:536 report_bug+0x72a/0x880 lib/bug.c:186 fixup_bug arch/x86/kernel/traps.c:179 [inline] do_error_trap+0x1c1/0x620 arch/x86/kernel/traps.c:298 do_invalid_op+0x46/0x50 arch/x86/kernel/traps.c:317 invalid_op+0x14/0x20 arch/x86/entry/entry_64.S:995 RIP: 0010:sysfs_remove_group+0x1d7/0x5f0 fs/sysfs/group.c:233 RSP: 0018:ffff8801a6dff3a8 EFLAGS: 00010282 RAX: 0000000000000030 RBX: 0000000000000000 RCX: 0000000000000000 RDX: 0000000000000000 RSI: aaaaaaaaaaaab000 RDI: ffffea0000000000 RBP: ffff8801a6dff410 R08: 0000000001080020 R09: 0000000000000002 R10: 0000000000000000 R11: ffffffff86575950 R12: ffffffff8aa09f94 R13: 0000000000000000 R14: ffff8801d31f8060 R15: ffffffff8b58d000 loop_sysfs_exit drivers/block/loop.c:820 [inline] loop_clr_fd+0x889/0xf70 drivers/block/loop.c:1074 __lo_release drivers/block/loop.c:1644 [inline] lo_release+0x1f3/0x2b0 drivers/block/loop.c:1662 __blkdev_put+0x8ed/0xc90 fs/block_dev.c:1790 blkdev_put+0x435/0x570 fs/block_dev.c:1852 blkdev_close+0xa6/0xf0 fs/block_dev.c:1859 __fput+0x458/0xa30 fs/file_table.c:209 ____fput+0x37/0x40 fs/file_table.c:243 task_work_run+0x22e/0x2b0 kernel/task_work.c:113 exit_task_work include/linux/task_work.h:22 [inline] do_exit+0x110e/0x3930 kernel/exit.c:867 do_group_exit+0x1a0/0x360 kernel/exit.c:970 get_signal+0x1405/0x1ec0 kernel/signal.c:2482 do_signal+0xb8/0x1d20 arch/x86/kernel/signal.c:810 exit_to_usermode_loop arch/x86/entry/common.c:162 [inline] prepare_exit_to_usermode+0x271/0x3a0 arch/x86/entry/common.c:196 syscall_return_slowpath+0xe9/0x710 arch/x86/entry/common.c:265 do_syscall_64+0x1ad/0x230 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x455a99 RSP: 002b:00007f7716105ce8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: fffffffffffffe00 RBX: 000000000072bec0 RCX: 0000000000455a99 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 000000000072bec0 RBP: 000000000072bec0 R08: 0000000000000032 R09: 000000000072bea0 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000a3e81f R14: 00007f77161069c0 R15: 0000000000000000 Dumping ftrace buffer: (ftrace buffer empty) Kernel Offset: disabled Rebooting in 86400 seconds..