------------[ cut here ]------------ sysfs group 'loop' not found for kobject 'loop0' WARNING: CPU: 1 PID: 13303 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: 1 PID: 13303 Comm: syz-executor3 Not tainted 4.17.0+ #17 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 FAULT_INJECTION: forcing a failure. name failslab, interval 1, probability 0, space 0, times 0 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:997 RIP: 0010:sysfs_remove_group+0x1d7/0x5f0 fs/sysfs/group.c:233 RSP: 0018:ffff8801a5c0f848 EFLAGS: 00010282 RAX: 0000000000000030 RBX: 0000000000000000 RCX: 0000000000000000 RDX: 0000000000000000 RSI: aaaaaaaaaaaab000 RDI: ffffea000040b120 RBP: ffff8801a5c0f8b0 R08: 0000000001080020 R09: 0000000000000002 R10: 0000000000000000 R11: ffffffff86577160 R12: ffffffff8aa0a304 R13: 0000000000000000 R14: ffff88012248b6c8 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 __do_sys_exit_group+0x21/0x30 kernel/exit.c:981 __se_sys_exit_group+0x14/0x20 kernel/exit.c:979 __x64_sys_exit_group+0x4c/0x50 kernel/exit.c:979 do_syscall_64+0x15b/0x230 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x63/0xe7 RIP: 0033:0x455ab9 RSP: 002b:0000000000a3ea98 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 RAX: ffffffffffffffda RBX: 0000000000000013 RCX: 0000000000455ab9 RDX: 00000000000003ae RSI: 0000000000730480 RDI: 0000000000000000 RBP: 0000000000000013 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000009 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000a3f160 R15: 00000000007024c0 CPU: 0 PID: 13353 Comm: syz-executor2 Not tainted 4.17.0+ #17 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 fail_dump lib/fault-inject.c:51 [inline] should_fail+0x87b/0xab0 lib/fault-inject.c:149 __should_failslab+0x278/0x2a0 mm/failslab.c:32 should_failslab+0x29/0x70 mm/slab_common.c:1522 slab_pre_alloc_hook mm/slab.h:423 [inline] slab_alloc_node mm/slub.c:2679 [inline] slab_alloc mm/slub.c:2761 [inline] __kmalloc+0xbe/0x350 mm/slub.c:3812 kmalloc include/linux/slab.h:517 [inline] kzalloc include/linux/slab.h:701 [inline] sctp_add_bind_addr+0xb0/0x630 net/sctp/bind_addr.c:159 sctp_copy_local_addr_list+0x4e1/0x610 net/sctp/protocol.c:180 sctp_copy_one_addr+0x210/0xc40 net/sctp/bind_addr.c:449 sctp_bind_addr_copy+0x28c/0x970 net/sctp/bind_addr.c:71 sctp_assoc_set_bind_addr_from_ep+0x21b/0x280 net/sctp/associola.c:1606 sctp_sendmsg_new_asoc net/sctp/socket.c:1746 [inline] sctp_sendmsg+0x4764/0x5fc0 net/sctp/socket.c:2095 inet_sendmsg+0x3fc/0x760 net/ipv4/af_inet.c:798 sock_sendmsg_nosec net/socket.c:629 [inline] sock_sendmsg net/socket.c:639 [inline] __sys_sendto+0x6c4/0x7e0 net/socket.c:1789 __do_sys_sendto net/socket.c:1801 [inline] __se_sys_sendto net/socket.c:1797 [inline] __x64_sys_sendto+0x1a1/0x210 net/socket.c:1797 do_syscall_64+0x15b/0x230 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x63/0xe7 RIP: 0033:0x455ab9 RSP: 002b:00007f8d1320ec68 EFLAGS: 00000246 ORIG_RAX: 000000000000002c RAX: ffffffffffffffda RBX: 00007f8d1320f6d4 RCX: 0000000000455ab9 RDX: 0000000000000001 RSI: 0000000020000140 RDI: 0000000000000014 RBP: 000000000072bea0 R08: 000000002005ffe4 R09: 000000000000001c R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000015 R13: 00000000004c10ba R14: 00000000004d1208 R15: 0000000000000009 Dumping ftrace buffer: (ftrace buffer empty) Kernel Offset: disabled Rebooting in 86400 seconds..