------------[ cut here ]------------ kernfs: can not remove 'nr_tags', no directory WARNING: CPU: 0 PID: 4933 at fs/kernfs/dir.c:1557 kernfs_remove_by_name_ns+0xd0/0x158 Modules linked in: CPU: 0 PID: 4933 Comm: syz-executor.0 Not tainted 5.15.167-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024 pstate: 60400005 (nZCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : kernfs_remove_by_name_ns+0xd0/0x158 lr : kernfs_remove_by_name_ns+0xcc/0x158 fs/kernfs/dir.c:1556 sp : ffff80001f977760 x29: ffff80001f977760 x28: ffff0000cbcdb000 x27: ffff0000cbcbcb00 x26: 0000000000000000 x25: ffff800015254348 x24: 1ffff000024163d0 x23: dfff800000000000 x22: ffff800015254380 x21: 0000000000000000 x20: 0000000000000000 x19: 00000000fffffffe x18: 0000000000000001 x17: 0000000000000000 x16: ffff800011ac23e0 x15: 00000000ffffffff x14: ffff0000d1749b40 x13: 0000000000000001 x12: 0000000000000001 x11: 0000000000000000 x10: 0000000000000000 x9 : 0e0839c5ea58e000 x8 : 0e0839c5ea58e000 x7 : 0000000000000001 x6 : 0000000000000001 x5 : ffff80001f976ed8 x4 : ffff800014b9fae0 x3 : ffff800008557c4c x2 : 0000000000000001 x1 : 0000000100000000 x0 : 000000000000002e Call trace: kernfs_remove_by_name_ns+0xd0/0x158 kernfs_remove_by_name include/linux/kernfs.h:598 [inline] remove_files fs/sysfs/group.c:28 [inline] sysfs_remove_group+0xf8/0x288 fs/sysfs/group.c:289 sysfs_remove_groups+0x5c/0xb4 fs/sysfs/group.c:313 __kobject_del+0x90/0x2d4 lib/kobject.c:619 kobject_del+0x48/0x68 lib/kobject.c:651 blk_mq_unregister_hctx block/blk-mq-sysfs.c:183 [inline] blk_mq_sysfs_unregister+0x1a0/0x274 block/blk-mq-sysfs.c:309 __blk_mq_update_nr_hw_queues block/blk-mq.c:3780 [inline] blk_mq_update_nr_hw_queues+0x504/0xc58 block/blk-mq.c:3820 nbd_start_device+0x158/0xb34 drivers/block/nbd.c:1301 nbd_start_device_ioctl drivers/block/nbd.c:1351 [inline] __nbd_ioctl drivers/block/nbd.c:1427 [inline] nbd_ioctl+0x420/0xc2c drivers/block/nbd.c:1467 blkdev_ioctl+0x3d8/0xbd0 block/ioctl.c:604 block_ioctl+0xa8/0x114 block/fops.c:493 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:874 [inline] __se_sys_ioctl fs/ioctl.c:860 [inline] __arm64_sys_ioctl+0x14c/0x1c8 fs/ioctl.c:860 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142 do_el0_svc+0x58/0x14c arch/arm64/kernel/syscall.c:181 el0_svc+0x7c/0x1f0 arch/arm64/kernel/entry-common.c:608 el0t_64_sync_handler+0x84/0xe4 arch/arm64/kernel/entry-common.c:626 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584 irq event stamp: 1182 hardirqs last enabled at (1181): [] __up_console_sem+0xb4/0x100 kernel/printk/printk.c:257 hardirqs last disabled at (1182): [] el1_dbg+0x24/0x80 arch/arm64/kernel/entry-common.c:396 softirqs last enabled at (298): [] local_bh_enable+0x10/0x34 include/linux/bottom_half.h:31 softirqs last disabled at (296): [] local_bh_disable+0x10/0x34 include/linux/bottom_half.h:18 ---[ end trace 81300a981b31126f ]--- ------------[ cut here ]------------ kernfs: can not remove 'nr_reserved_tags', no directory WARNING: CPU: 0 PID: 4933 at fs/kernfs/dir.c:1557 kernfs_remove_by_name_ns+0xd0/0x158 Modules linked in: CPU: 0 PID: 4933 Comm: syz-executor.0 Tainted: G W 5.15.167-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024 pstate: 60400005 (nZCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : kernfs_remove_by_name_ns+0xd0/0x158 lr : kernfs_remove_by_name_ns+0xcc/0x158 fs/kernfs/dir.c:1556 sp : ffff80001f977760 x29: ffff80001f977760 x28: ffff0000cbcdb000 x27: ffff0000cbcbcb00 x26: 0000000000000000 x25: ffff800015254350 x24: 1ffff000024163d0 x23: dfff800000000000 x22: ffff8000152543e0 x21: 0000000000000000 x20: 0000000000000000 x19: 00000000fffffffe x18: 1fffe00036831b8e x17: 1fffe00036831b8e x16: ffff8000082ec9a8 x15: ffff800014b5ef40 x14: 1ffff0000295806a x13: dfff800000000000 x12: 0000000000000001 x11: 0000000000000000 x10: 0000000000000000 x9 : 0e0839c5ea58e000 x8 : 0e0839c5ea58e000 x7 : 0000000000000000 x6 : 0000000000000000 x5 : 0000000000000080 x4 : 0000000000000000 x3 : ffff80000825938c x2 : 0000000000000001 x1 : 0000000100000000 x0 : 0000000000000037 Call trace: kernfs_remove_by_name_ns+0xd0/0x158 kernfs_remove_by_name include/linux/kernfs.h:598 [inline] remove_files fs/sysfs/group.c:28 [inline] sysfs_remove_group+0xf8/0x288 fs/sysfs/group.c:289 sysfs_remove_groups+0x5c/0xb4 fs/sysfs/group.c:313 __kobject_del+0x90/0x2d4 lib/kobject.c:619 kobject_del+0x48/0x68 lib/kobject.c:651 blk_mq_unregister_hctx block/blk-mq-sysfs.c:183 [inline] blk_mq_sysfs_unregister+0x1a0/0x274 block/blk-mq-sysfs.c:309 __blk_mq_update_nr_hw_queues block/blk-mq.c:3780 [inline] blk_mq_update_nr_hw_queues+0x504/0xc58 block/blk-mq.c:3820 nbd_start_device+0x158/0xb34 drivers/block/nbd.c:1301 nbd_start_device_ioctl drivers/block/nbd.c:1351 [inline] __nbd_ioctl drivers/block/nbd.c:1427 [inline] nbd_ioctl+0x420/0xc2c drivers/block/nbd.c:1467 blkdev_ioctl+0x3d8/0xbd0 block/ioctl.c:604 block_ioctl+0xa8/0x114 block/fops.c:493 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:874 [inline] __se_sys_ioctl fs/ioctl.c:860 [inline] __arm64_sys_ioctl+0x14c/0x1c8 fs/ioctl.c:860 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142 do_el0_svc+0x58/0x14c arch/arm64/kernel/syscall.c:181 el0_svc+0x7c/0x1f0 arch/arm64/kernel/entry-common.c:608 el0t_64_sync_handler+0x84/0xe4 arch/arm64/kernel/entry-common.c:626 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584 irq event stamp: 1448 hardirqs last enabled at (1447): [] raw_spin_rq_unlock_irq kernel/sched/sched.h:1338 [inline] hardirqs last enabled at (1447): [] finish_lock_switch+0xbc/0x1e8 kernel/sched/core.c:4781 hardirqs last disabled at (1448): [] el1_dbg+0x24/0x80 arch/arm64/kernel/entry-common.c:396 softirqs last enabled at (1442): [] softirq_handle_end kernel/softirq.c:401 [inline] softirqs last enabled at (1442): [] handle_softirqs+0xb88/0xdbc kernel/softirq.c:586 softirqs last disabled at (1407): [] __do_softirq kernel/softirq.c:592 [inline] softirqs last disabled at (1407): [] do_softirq_own_stack include/asm-generic/softirq_stack.h:10 [inline] softirqs last disabled at (1407): [] invoke_softirq kernel/softirq.c:439 [inline] softirqs last disabled at (1407): [] __irq_exit_rcu+0x268/0x4d8 kernel/softirq.c:641 ---[ end trace 81300a981b311270 ]--- ------------[ cut here ]------------ kernfs: can not remove 'cpu_list', no directory WARNING: CPU: 1 PID: 4933 at fs/kernfs/dir.c:1557 kernfs_remove_by_name_ns+0xd0/0x158 Modules linked in: CPU: 1 PID: 4933 Comm: syz-executor.0 Tainted: G W 5.15.167-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024 pstate: 60400005 (nZCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : kernfs_remove_by_name_ns+0xd0/0x158 lr : kernfs_remove_by_name_ns+0xcc/0x158 fs/kernfs/dir.c:1556 sp : ffff80001f977760 x29: ffff80001f977760 x28: ffff0000cbcdb000 x27: ffff0000cbcbcb00 x26: 0000000000000000 x25: ffff800015254358 x24: 1ffff000024163d0 x23: dfff800000000000 x22: ffff800015254440 x21: 0000000000000000 x20: 0000000000000000 x19: 00000000fffffffe x18: 1fffe00036835d8e x17: 1fffe00036835d8e x16: ffff800011ac23e0 x15: ffff800014b5ef40 x14: 1ffff0000295806a x13: dfff800000000000 x12: 0000000000000001 x11: 0000000000000000 x10: 0000000000000000 x9 : 0e0839c5ea58e000 x8 : 0e0839c5ea58e000 x7 : 0000000000000000 x6 : 0000000000000000 x5 : 0000000000000080 x4 : 0000000000000000 x3 : ffff800008557c4c x2 : 0000000000000001 x1 : 0000000100000000 x0 : 000000000000002f Call trace: kernfs_remove_by_name_ns+0xd0/0x158 kernfs_remove_by_name include/linux/kernfs.h:598 [inline] remove_files fs/sysfs/group.c:28 [inline] sysfs_remove_group+0xf8/0x288 fs/sysfs/group.c:289 sysfs_remove_groups+0x5c/0xb4 fs/sysfs/group.c:313 __kobject_del+0x90/0x2d4 lib/kobject.c:619 kobject_del+0x48/0x68 lib/kobject.c:651 blk_mq_unregister_hctx block/blk-mq-sysfs.c:183 [inline] blk_mq_sysfs_unregister+0x1a0/0x274 block/blk-mq-sysfs.c:309 __blk_mq_update_nr_hw_queues block/blk-mq.c:3780 [inline] blk_mq_update_nr_hw_queues+0x504/0xc58 block/blk-mq.c:3820 nbd_start_device+0x158/0xb34 drivers/block/nbd.c:1301 nbd_start_device_ioctl drivers/block/nbd.c:1351 [inline] __nbd_ioctl drivers/block/nbd.c:1427 [inline] nbd_ioctl+0x420/0xc2c drivers/block/nbd.c:1467 blkdev_ioctl+0x3d8/0xbd0 block/ioctl.c:604 block_ioctl+0xa8/0x114 block/fops.c:493 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:874 [inline] __se_sys_ioctl fs/ioctl.c:860 [inline] __arm64_sys_ioctl+0x14c/0x1c8 fs/ioctl.c:860 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142 do_el0_svc+0x58/0x14c arch/arm64/kernel/syscall.c:181 el0_svc+0x7c/0x1f0 arch/arm64/kernel/entry-common.c:608 el0t_64_sync_handler+0x84/0xe4 arch/arm64/kernel/entry-common.c:626 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584 irq event stamp: 1654 hardirqs last enabled at (1653): [] raw_spin_rq_unlock_irq kernel/sched/sched.h:1338 [inline] hardirqs last enabled at (1653): [] finish_lock_switch+0xbc/0x1e8 kernel/sched/core.c:4781 hardirqs last disabled at (1654): [] el1_dbg+0x24/0x80 arch/arm64/kernel/entry-common.c:396 softirqs last enabled at (1602): [] softirq_handle_end kernel/softirq.c:401 [inline] softirqs last enabled at (1602): [] handle_softirqs+0xb88/0xdbc kernel/softirq.c:586 softirqs last disabled at (1451): [] __do_softirq kernel/softirq.c:592 [inline] softirqs last disabled at (1451): [] do_softirq_own_stack include/asm-generic/softirq_stack.h:10 [inline] softirqs last disabled at (1451): [] invoke_softirq kernel/softirq.c:439 [inline] softirqs last disabled at (1451): [] __irq_exit_rcu+0x268/0x4d8 kernel/softirq.c:641 ---[ end trace 81300a981b311271 ]--- FAULT_INJECTION: forcing a failure. name failslab, interval 1, probability 0, space 0, times 0 CPU: 1 PID: 4933 Comm: syz-executor.0 Tainted: G W 5.15.167-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024 Call trace: dump_backtrace+0x0/0x530 arch/arm64/kernel/stacktrace.c:152 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:216 __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x108/0x170 lib/dump_stack.c:106 dump_stack+0x1c/0x58 lib/dump_stack.c:113 fail_dump lib/fault-inject.c:52 [inline] should_fail+0x3b8/0x514 lib/fault-inject.c:146 __should_failslab+0xbc/0x110 mm/failslab.c:33 should_failslab+0x10/0x28 mm/slab_common.c:1337 slab_pre_alloc_hook+0x64/0xe8 mm/slab.h:494 slab_alloc_node mm/slub.c:3134 [inline] __kmalloc_node+0xbc/0x5b8 mm/slub.c:4451 kmalloc_array_node include/linux/slab.h:684 [inline] kcalloc_node include/linux/slab.h:689 [inline] blk_mq_realloc_hw_ctxs+0xc4/0x12ec block/blk-mq.c:3224 __blk_mq_update_nr_hw_queues block/blk-mq.c:3792 [inline] blk_mq_update_nr_hw_queues+0x68c/0xc58 block/blk-mq.c:3820 nbd_start_device+0x158/0xb34 drivers/block/nbd.c:1301 nbd_start_device_ioctl drivers/block/nbd.c:1351 [inline] __nbd_ioctl drivers/block/nbd.c:1427 [inline] nbd_ioctl+0x420/0xc2c drivers/block/nbd.c:1467 blkdev_ioctl+0x3d8/0xbd0 block/ioctl.c:604 block_ioctl+0xa8/0x114 block/fops.c:493 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:874 [inline] __se_sys_ioctl fs/ioctl.c:860 [inline] __arm64_sys_ioctl+0x14c/0x1c8 fs/ioctl.c:860 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142 do_el0_svc+0x58/0x14c arch/arm64/kernel/syscall.c:181 el0_svc+0x7c/0x1f0 arch/arm64/kernel/entry-common.c:608 el0t_64_sync_handler+0x84/0xe4 arch/arm64/kernel/entry-common.c:626 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584 Increasing nr_hw_queues to 2 fails, fallback to 1