R13: 0000000000000007 R14: 0030656c69662f2e R15: 0000000000000000 ------------[ cut here ]------------ FAT-fs (loop7): bogus number of reserved sectors sysfs group 'loop' not found for kobject 'loop6' FAT-fs (loop7): Can't find a valid FAT filesystem WARNING: CPU: 0 PID: 4537 at fs/sysfs/group.c:235 sysfs_remove_group+0x15b/0x1b0 fs/sysfs/group.c:233 ------------[ cut here ]------------ Kernel panic - not syncing: panic_on_warn set ... CPU: 0 PID: 4537 Comm: syz-executor023 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 sysfs group 'loop' not found for kobject 'loop0' panic+0x22f/0x4de kernel/panic.c:184 WARNING: CPU: 1 PID: 4534 at fs/sysfs/group.c:235 sysfs_remove_group+0x15b/0x1b0 fs/sysfs/group.c:233 Modules linked in: CPU: 1 PID: 4534 Comm: syz-executor023 Not tainted 4.17.0-rc5+ #54 __warn.cold.8+0x163/0x1b3 kernel/panic.c:536 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:sysfs_remove_group+0x15b/0x1b0 fs/sysfs/group.c:233 report_bug+0x252/0x2d0 lib/bug.c:186 RSP: 0018:ffff8801cf277848 EFLAGS: 00010286 fixup_bug arch/x86/kernel/traps.c:178 [inline] do_error_trap+0x1de/0x490 arch/x86/kernel/traps.c:296 RAX: 0000000000000030 RBX: ffffffff892dc900 RCX: ffffffff8160aa5d RDX: 0000000000000000 RSI: ffffffff8160f711 RDI: ffff8801cf2773a8 RBP: ffff8801cf277870 R08: ffff8801d0200100 R09: 0000000000000006 R10: ffff8801d0200100 R11: 0000000000000000 R12: 0000000000000000 do_invalid_op+0x1b/0x20 arch/x86/kernel/traps.c:315 R13: ffff8801d2818b20 R14: ffffffff88279e00 R15: ffff8801d2807e68 invalid_op+0x14/0x20 arch/x86/entry/entry_64.S:992 FS: 0000000001dd6880(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 RIP: 0010:sysfs_remove_group+0x15b/0x1b0 fs/sysfs/group.c:233 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 RSP: 0018:ffff8801c6b47848 EFLAGS: 00010286 CR2: 00007f6d2d0c5af0 CR3: 00000001d9b78000 CR4: 00000000001406e0 RAX: 0000000000000030 RBX: ffffffff892dc900 RCX: ffffffff8160aa5d DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 RDX: 0000000000000000 RSI: ffffffff8160f711 RDI: ffff8801c6b473a8 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 RBP: ffff8801c6b47870 R08: ffff8801ad20e1c0 R09: 0000000000000006 Call Trace: R10: ffff8801ad20e1c0 R11: 0000000000000000 R12: 0000000000000000 loop_sysfs_exit drivers/block/loop.c:820 [inline] loop_clr_fd+0x51e/0xb80 drivers/block/loop.c:1073 R13: ffff8801d2a50e20 R14: ffffffff88279e00 R15: ffff8801d2a019a8 lo_ioctl+0x642/0x2130 drivers/block/loop.c:1404 loop_sysfs_exit drivers/block/loop.c:820 [inline] loop_clr_fd+0x51e/0xb80 drivers/block/loop.c:1073 __blkdev_driver_ioctl block/ioctl.c:303 [inline] blkdev_ioctl+0x9b6/0x2020 block/ioctl.c:601 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 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 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: 0033:0x441147 RSP: 002b:00007ffc662c71c8 EFLAGS: 00000207 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 0000000000000016 RCX: 0000000000441147 entry_SYSCALL_64_after_hwframe+0x49/0xbe RDX: 0000000000000000 RSI: 0000000000004c01 RDI: 0000000000000008 RIP: 0033:0x441147 RBP: 00007ffc662c71e0 R08: 0000000020000240 R09: 000000000000000a RSP: 002b:00007ffc662c71c8 EFLAGS: 00000207 R10: 0000000000000000 R11: 0000000000000207 R12: 0000000000000008 ORIG_RAX: 0000000000000010 R13: 0000000000000007 R14: 0030656c69662f2e R15: 0000000000000000 RAX: ffffffffffffffda RBX: 0000000000000016 RCX: 0000000000441147 Code: RDX: 0000000000000000 RSI: 0000000000004c01 RDI: 0000000000000008 6e RBP: 00007ffc662c71e0 R08: 0000000020000240 R09: 000000000000000a R10: 0000000000000000 R11: 0000000000000207 R12: 0000000000000008 48 R13: 0000000000000007 R14: 0030656c69662f2e R15: 0000000000000000 89 d9 49 8b 55 00 48 b8 00 00 00 00 00 fc ff df 48 c1 e9 03 80 3c 01 00 75 41 48 8b 33 48 c7 c7 40 c6 d5 87 e8 d5 4a 5e ff <0f> 0b eb 92 e8 8c 7c ce ff e9 d0 fe ff ff 48 89 df e8 7f 7c ce irq event stamp: 2629706 hardirqs last enabled at (2629705): [] restore_regs_and_return_to_kernel+0x0/0x2b hardirqs last disabled at (2629706): [] error_entry+0x76/0xd0 arch/x86/entry/entry_64.S:1262 softirqs last enabled at (2629704): [] __do_softirq+0x778/0xaf5 kernel/softirq.c:311 softirqs last disabled at (2629697): [] invoke_softirq kernel/softirq.c:365 [inline] softirqs last disabled at (2629697): [] irq_exit+0x1d1/0x200 kernel/softirq.c:405 ---[ end trace 224ecd5ebacc3e2f ]--- Dumping ftrace buffer: (ftrace buffer empty) Kernel Offset: disabled Rebooting in 86400 seconds..