md/raid:md0: device ram1 operational as raid disk 0
md/raid:md0: couldn't allocate thread.
=============================================================================
======================================================
WARNING: possible circular locking dependency detected
syzkaller #0 Not tainted
------------------------------------------------------
syz.2.37/6146 is trying to acquire lock:
ffffffff8d1263e0 (console_owner){....}-{0:0}, at: rcu_try_lock_acquire include/linux/rcupdate.h:339 [inline]
ffffffff8d1263e0 (console_owner){....}-{0:0}, at: srcu_read_lock_nmisafe include/linux/srcu.h:232 [inline]
ffffffff8d1263e0 (console_owner){....}-{0:0}, at: console_srcu_read_lock kernel/printk/printk.c:292 [inline]
ffffffff8d1263e0 (console_owner){....}-{0:0}, at: console_flush_all+0x10b/0xcf0 kernel/printk/printk.c:2992

but task is already holding lock:
ffff88807d3813d8 (&n->list_lock){-.-.}-{2:2}, at: spin_lock_irq include/linux/spinlock.h:376 [inline]
ffff88807d3813d8 (&n->list_lock){-.-.}-{2:2}, at: free_partial mm/slub.c:4623 [inline]
ffff88807d3813d8 (&n->list_lock){-.-.}-{2:2}, at: __kmem_cache_shutdown+0x98/0x230 mm/slub.c:4661

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #4 (&n->list_lock){-.-.}-{2:2}:
       __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
       _raw_spin_lock_irqsave+0xb4/0x100 kernel/locking/spinlock.c:162
       get_partial_node+0x36/0x550 mm/slub.c:2301
       get_partial mm/slub.c:2416 [inline]
       ___slab_alloc+0x9cc/0x12f0 mm/slub.c:3230
       __slab_alloc mm/slub.c:3339 [inline]
       __slab_alloc_node mm/slub.c:3392 [inline]
       slab_alloc_node mm/slub.c:3485 [inline]
       slab_alloc mm/slub.c:3503 [inline]
       __kmem_cache_alloc_lru mm/slub.c:3510 [inline]
       kmem_cache_alloc+0x109/0x2c0 mm/slub.c:3519
       kmem_cache_zalloc include/linux/slab.h:711 [inline]
       fill_pool lib/debugobjects.c:169 [inline]
       debug_objects_fill_pool+0x42d/0x790 lib/debugobjects.c:654
       debug_object_activate+0x36/0x500 lib/debugobjects.c:743
       debug_hrtimer_activate kernel/time/hrtimer.c:450 [inline]
       debug_activate kernel/time/hrtimer.c:504 [inline]
       enqueue_hrtimer+0x34/0x380 kernel/time/hrtimer.c:1100
       __run_hrtimer kernel/time/hrtimer.c:1771 [inline]
       __hrtimer_run_queues+0x62f/0xc10 kernel/time/hrtimer.c:1818
       hrtimer_interrupt+0x39d/0x980 kernel/time/hrtimer.c:1880
       local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1077 [inline]
       __sysvec_apic_timer_interrupt+0xfb/0x3b0 arch/x86/kernel/apic/apic.c:1094
       instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1088 [inline]
       sysvec_apic_timer_interrupt+0x9f/0xc0 arch/x86/kernel/apic/apic.c:1088
       asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:687
       __sanitizer_cov_trace_switch+0x65/0xe0 kernel/kcov.c:346
       unwind_next_frame+0x748/0x2990 arch/x86/kernel/unwind_orc.c:515
       __unwind_start+0x5bb/0x730 arch/x86/kernel/unwind_orc.c:760
       unwind_start arch/x86/include/asm/unwind.h:64 [inline]
       arch_stack_walk+0xf8/0x190 arch/x86/kernel/stacktrace.c:24
       stack_trace_save+0xaa/0x100 kernel/stacktrace.c:122
       kasan_save_stack mm/kasan/common.c:46 [inline]
       kasan_set_track+0x4e/0x70 mm/kasan/common.c:53
       __kasan_slab_alloc+0x6c/0x80 mm/kasan/common.c:329
       kasan_slab_alloc include/linux/kasan.h:188 [inline]
       slab_post_alloc_hook+0x6a/0x4d0 mm/slab.h:770
       slab_alloc_node mm/slub.c:3495 [inline]
       slab_alloc mm/slub.c:3503 [inline]
       __kmem_cache_alloc_lru mm/slub.c:3510 [inline]
       kmem_cache_alloc+0x17e/0x2c0 mm/slub.c:3519
       kmem_cache_zalloc include/linux/slab.h:711 [inline]
       __kernfs_new_node+0xe5/0x7f0 fs/kernfs/dir.c:624
       kernfs_new_node+0x14c/0x260 fs/kernfs/dir.c:700
       __kernfs_create_file+0x4b/0x2e0 fs/kernfs/file.c:1068
       sysfs_add_file_mode_ns+0x237/0x2f0 fs/sysfs/file.c:298
       create_files fs/sysfs/group.c:64 [inline]
       internal_create_group+0x431/0xd10 fs/sysfs/group.c:152
       internal_create_groups fs/sysfs/group.c:192 [inline]
       sysfs_create_groups+0x59/0x120 fs/sysfs/group.c:218
       device_add_groups drivers/base/core.c:2786 [inline]
       device_add_attrs+0x1b2/0x830 drivers/base/core.c:2906
       device_add+0x51a/0xc40 drivers/base/core.c:3639
       netdev_register_kobject+0x188/0x320 net/core/net-sysfs.c:2042
       register_netdevice+0x12aa/0x1ba0 net/core/dev.c:10342
       register_netdev+0x3b/0x50 net/core/dev.c:10474
       vti6_init_net+0x238/0x360 net/ipv6/ip6_vti.c:1178
       ops_init+0x391/0x640 net/core/net_namespace.c:139
       setup_net+0x3b6/0xa20 net/core/net_namespace.c:343
       copy_net_ns+0x361/0x530 net/core/net_namespace.c:524
       create_new_namespaces+0x3ce/0x700 kernel/nsproxy.c:110
       unshare_nsproxy_namespaces+0x11a/0x160 kernel/nsproxy.c:228
       ksys_unshare+0x4fa/0x8f0 kernel/fork.c:3444
       __do_sys_unshare kernel/fork.c:3518 [inline]
       __se_sys_unshare kernel/fork.c:3516 [inline]
       __x64_sys_unshare+0x38/0x40 kernel/fork.c:3516
       do_syscall_x64 arch/x86/entry/common.c:46 [inline]
       do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:76
       entry_SYSCALL_64_after_hwframe+0x68/0xd2

-> #3 (hrtimer_bases.lock){-.-.}-{2:2}:
       __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
       _raw_spin_lock_irqsave+0xb4/0x100 kernel/locking/spinlock.c:162
       lock_hrtimer_base kernel/time/hrtimer.c:181 [inline]
       hrtimer_start_range_ns+0xf5/0x1080 kernel/time/hrtimer.c:1350
       rpm_suspend+0x1678/0x1b60 drivers/base/power/runtime.c:604
       rpm_resume+0x14a5/0x1b80 drivers/base/power/runtime.c:927
       pm_runtime_work+0x103/0x1b0 drivers/base/power/runtime.c:977
       process_one_work kernel/workqueue.c:2657 [inline]
       process_scheduled_works+0xa60/0x1600 kernel/workqueue.c:2734
       worker_thread+0xa5e/0xfe0 kernel/workqueue.c:2815
       kthread+0x2fa/0x390 kernel/kthread.c:388
       ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152
       ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293

-> #2 (&dev->power.lock){-.-.}-{2:2}:
       __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
       _raw_spin_lock_irqsave+0xb4/0x100 kernel/locking/spinlock.c:162
       __pm_runtime_resume+0x10f/0x170 drivers/base/power/runtime.c:1169
       pm_runtime_get include/linux/pm_runtime.h:402 [inline]
       __uart_start+0x171/0x3e0 drivers/tty/serial/serial_core.c:148
       uart_write+0x449/0x5d0 drivers/tty/serial/serial_core.c:633
       process_output_block drivers/tty/n_tty.c:580 [inline]
       n_tty_write+0xd3d/0x11e0 drivers/tty/n_tty.c:2395
       iterate_tty_write drivers/tty/tty_io.c:1017 [inline]
       file_tty_write+0x529/0x960 drivers/tty/tty_io.c:1088
       call_write_iter include/linux/fs.h:2018 [inline]
       new_sync_write fs/read_write.c:491 [inline]
       vfs_write+0x474/0x9a0 fs/read_write.c:584
       ksys_write+0x151/0x260 fs/read_write.c:637
       do_syscall_x64 arch/x86/entry/common.c:46 [inline]
       do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:76
       entry_SYSCALL_64_after_hwframe+0x68/0xd2

-> #1 (&port_lock_key){-.-.}-{2:2}:
       __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
       _raw_spin_lock_irqsave+0xb4/0x100 kernel/locking/spinlock.c:162
       serial8250_console_write+0x181/0x18b0 drivers/tty/serial/8250/8250_port.c:3439
       console_emit_next_record kernel/printk/printk.c:2944 [inline]
       console_flush_all+0x6ad/0xcf0 kernel/printk/printk.c:3000
       console_unlock+0xad/0x350 kernel/printk/printk.c:3069
       vprintk_emit+0x497/0x610 kernel/printk/printk.c:2341
       _printk+0xde/0x130 kernel/printk/printk.c:2366
       register_console+0xb96/0xf00 kernel/printk/printk.c:3583
       univ8250_console_init+0x45/0x50 drivers/tty/serial/8250/8250_core.c:717
       console_init+0x17b/0x5d0 kernel/printk/printk.c:3726
       start_kernel+0x2c8/0x4e0 init/main.c:982
       x86_64_start_reservations+0x2a/0x30 arch/x86/kernel/head64.c:555
       copy_bootdata+0x0/0xd0 arch/x86/kernel/head64.c:536
       secondary_startup_64_no_verify+0x179/0x17b

-> #0 (console_owner){....}-{0:0}:
       check_prev_add kernel/locking/lockdep.c:3134 [inline]
       check_prevs_add kernel/locking/lockdep.c:3253 [inline]
       validate_chain kernel/locking/lockdep.c:3869 [inline]
       __lock_acquire+0x37ef/0x7d80 kernel/locking/lockdep.c:5137
       lock_acquire+0x19e/0x420 kernel/locking/lockdep.c:5756
       console_lock_spinning_enable kernel/printk/printk.c:1871 [inline]
       console_emit_next_record kernel/printk/printk.c:2938 [inline]
       console_flush_all+0x676/0xcf0 kernel/printk/printk.c:3000
       console_unlock+0xad/0x350 kernel/printk/printk.c:3069
       vprintk_emit+0x497/0x610 kernel/printk/printk.c:2341
       _printk+0xde/0x130 kernel/printk/printk.c:2366
       slab_bug+0x6d/0xc0 mm/slub.c:920
       slab_err+0x130/0x170 mm/slub.c:1026
       list_slab_objects+0x38/0x1a0 mm/slub.c:4596
       free_partial mm/slub.c:4629 [inline]
       __kmem_cache_shutdown+0x132/0x230 mm/slub.c:4661
       shutdown_cache mm/slab_common.c:457 [inline]
       kmem_cache_destroy+0x56/0x160 mm/slab_common.c:497
       shrink_stripes drivers/md/raid5.c:2726 [inline]
       free_conf+0x227/0x4b0 drivers/md/raid5.c:7442
       setup_conf+0x16c4/0x2a30 drivers/md/raid5.c:7772
       raid5_takeover_raid1 drivers/md/raid5.c:8825 [inline]
       raid5_takeover+0x61d/0x8a0 drivers/md/raid5.c:8936
       level_store+0x6b1/0x1a90 drivers/md/md.c:4028
       md_attr_store+0x196/0x380 drivers/md/md.c:5637
       kernfs_fop_write_iter+0x3a4/0x520 fs/kernfs/file.c:352
       call_write_iter include/linux/fs.h:2018 [inline]
       new_sync_write fs/read_write.c:491 [inline]
       vfs_write+0x474/0x9a0 fs/read_write.c:584
       ksys_write+0x151/0x260 fs/read_write.c:637
       do_syscall_x64 arch/x86/entry/common.c:46 [inline]
       do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:76
       entry_SYSCALL_64_after_hwframe+0x68/0xd2

other info that might help us debug this:

Chain exists of:
  console_owner --> hrtimer_bases.lock --> &n->list_lock

 Possible unsafe locking scenario:

       CPU0                    CPU1
       ----                    ----
  lock(&n->list_lock);
                               lock(hrtimer_bases.lock);
                               lock(&n->list_lock);
  lock(console_owner);

 *** DEADLOCK ***

10 locks held by syz.2.37/6146:
 #0: ffff88802b7f34c8 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x2a3/0x330 fs/file.c:1040
 #1: ffff88805dd88418 (sb_writers#8){.+.+}-{0:0}, at: vfs_write+0x21e/0x9a0 fs/read_write.c:580
 #2: ffff888025775088 (&of->mutex){+.+.}-{3:3}, at: kernfs_fop_write_iter+0x1dc/0x520 fs/kernfs/file.c:343
 #3: ffff8880310d69b8 (kn->active#61){.+.+}-{0:0}, at: kernfs_get_active_of fs/kernfs/file.c:80 [inline]
 #3: ffff8880310d69b8 (kn->active#61){.+.+}-{0:0}, at: kernfs_fop_write_iter+0x236/0x520 fs/kernfs/file.c:344
 #4: ffff88802cc3c2d0 (&mddev->reconfig_mutex){+.+.}-{3:3}, at: mddev_lock drivers/md/md.h:592 [inline]
 #4: ffff88802cc3c2d0 (&mddev->reconfig_mutex){+.+.}-{3:3}, at: level_store+0xd0/0x1a90 drivers/md/md.c:3951
 #5: ffffffff8cfcd450 (cpu_hotplug_lock){++++}-{0:0}, at: kmem_cache_destroy+0x30/0x160 mm/slab_common.c:488
 #6: ffffffff8d200b58 (slab_mutex){+.+.}-{3:3}, at: kmem_cache_destroy+0x3e/0x160 mm/slab_common.c:489
 #7: ffff88807d3813d8 (&n->list_lock){-.-.}-{2:2}, at: spin_lock_irq include/linux/spinlock.h:376 [inline]
 #7: ffff88807d3813d8 (&n->list_lock){-.-.}-{2:2}, at: free_partial mm/slub.c:4623 [inline]
 #7: ffff88807d3813d8 (&n->list_lock){-.-.}-{2:2}, at: __kmem_cache_shutdown+0x98/0x230 mm/slub.c:4661
 #8: ffffffff8d1264c0 (console_lock){+.+.}-{0:0}, at: _printk+0xde/0x130 kernel/printk/printk.c:2366
 #9: ffffffff8d00dcd0 (console_srcu){....}-{0:0}, at: rcu_try_lock_acquire include/linux/rcupdate.h:339 [inline]
 #9: ffffffff8d00dcd0 (console_srcu){....}-{0:0}, at: srcu_read_lock_nmisafe include/linux/srcu.h:232 [inline]
 #9: ffffffff8d00dcd0 (console_srcu){....}-{0:0}, at: console_srcu_read_lock kernel/printk/printk.c:292 [inline]
 #9: ffffffff8d00dcd0 (console_srcu){....}-{0:0}, at: console_flush_all+0x10b/0xcf0 kernel/printk/printk.c:2992

stack backtrace:
CPU: 0 PID: 6146 Comm: syz.2.37 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
Call Trace:
 <TASK>
 dump_stack_lvl+0x18c/0x250 lib/dump_stack.c:106
 check_noncircular+0x2fc/0x400 kernel/locking/lockdep.c:2187
 check_prev_add kernel/locking/lockdep.c:3134 [inline]
 check_prevs_add kernel/locking/lockdep.c:3253 [inline]
 validate_chain kernel/locking/lockdep.c:3869 [inline]
 __lock_acquire+0x37ef/0x7d80 kernel/locking/lockdep.c:5137
 lock_acquire+0x19e/0x420 kernel/locking/lockdep.c:5756
 console_lock_spinning_enable kernel/printk/printk.c:1871 [inline]
 console_emit_next_record kernel/printk/printk.c:2938 [inline]
 console_flush_all+0x676/0xcf0 kernel/printk/printk.c:3000
 console_unlock+0xad/0x350 kernel/printk/printk.c:3069
 vprintk_emit+0x497/0x610 kernel/printk/printk.c:2341
 _printk+0xde/0x130 kernel/printk/printk.c:2366
 slab_bug+0x6d/0xc0 mm/slub.c:920
 slab_err+0x130/0x170 mm/slub.c:1026
 list_slab_objects+0x38/0x1a0 mm/slub.c:4596
 free_partial mm/slub.c:4629 [inline]
 __kmem_cache_shutdown+0x132/0x230 mm/slub.c:4661
 shutdown_cache mm/slab_common.c:457 [inline]
 kmem_cache_destroy+0x56/0x160 mm/slab_common.c:497
 shrink_stripes drivers/md/raid5.c:2726 [inline]
 free_conf+0x227/0x4b0 drivers/md/raid5.c:7442
 setup_conf+0x16c4/0x2a30 drivers/md/raid5.c:7772
 raid5_takeover_raid1 drivers/md/raid5.c:8825 [inline]
 raid5_takeover+0x61d/0x8a0 drivers/md/raid5.c:8936
 level_store+0x6b1/0x1a90 drivers/md/md.c:4028
 md_attr_store+0x196/0x380 drivers/md/md.c:5637
 kernfs_fop_write_iter+0x3a4/0x520 fs/kernfs/file.c:352
 call_write_iter include/linux/fs.h:2018 [inline]
 new_sync_write fs/read_write.c:491 [inline]
 vfs_write+0x474/0x9a0 fs/read_write.c:584
 ksys_write+0x151/0x260 fs/read_write.c:637
 do_syscall_x64 arch/x86/entry/common.c:46 [inline]
 do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7fe51499e159
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fe51587a028 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007fe514c26180 RCX: 00007fe51499e159
RDX: 0000000000000005 RSI: 0000200000000300 RDI: 0000000000000007
RBP: 00007fe514a3506b R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fe514c26218 R14: 00007fe514c26180 R15: 00007fffe487c228
 </TASK>
BUG raid5-md0 (Not tainted): Objects remaining in raid5-md0 on __kmem_cache_shutdown()
-----------------------------------------------------------------------------

Slab 0xffffea0001e31600 objects=13 used=4 fp=0xffff888078c59360 flags=0xfff00000000840(slab|head|node=0|zone=1|lastcpupid=0x7ff)
CPU: 0 PID: 6146 Comm: syz.2.37 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
Call Trace:
 <TASK>
 dump_stack_lvl+0x18c/0x250 lib/dump_stack.c:106
 slab_err+0x13d/0x170 mm/slub.c:1028
 list_slab_objects+0x38/0x1a0 mm/slub.c:4596
 free_partial mm/slub.c:4629 [inline]
 __kmem_cache_shutdown+0x132/0x230 mm/slub.c:4661
 shutdown_cache mm/slab_common.c:457 [inline]
 kmem_cache_destroy+0x56/0x160 mm/slab_common.c:497
 shrink_stripes drivers/md/raid5.c:2726 [inline]
 free_conf+0x227/0x4b0 drivers/md/raid5.c:7442
 setup_conf+0x16c4/0x2a30 drivers/md/raid5.c:7772
 raid5_takeover_raid1 drivers/md/raid5.c:8825 [inline]
 raid5_takeover+0x61d/0x8a0 drivers/md/raid5.c:8936
 level_store+0x6b1/0x1a90 drivers/md/md.c:4028
 md_attr_store+0x196/0x380 drivers/md/md.c:5637
 kernfs_fop_write_iter+0x3a4/0x520 fs/kernfs/file.c:352
 call_write_iter include/linux/fs.h:2018 [inline]
 new_sync_write fs/read_write.c:491 [inline]
 vfs_write+0x474/0x9a0 fs/read_write.c:584
 ksys_write+0x151/0x260 fs/read_write.c:637
 do_syscall_x64 arch/x86/entry/common.c:46 [inline]
 do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7fe51499e159
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fe51587a028 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007fe514c26180 RCX: 00007fe51499e159
RDX: 0000000000000005 RSI: 0000200000000300 RDI: 0000000000000007
RBP: 00007fe514a3506b R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fe514c26218 R14: 00007fe514c26180 R15: 00007fffe487c228
 </TASK>
Object 0xffff888078c58000 @offset=0
Object 0xffff888078c584d8 @offset=1240
Object 0xffff888078c589b0 @offset=2480
Object 0xffff888078c58e88 @offset=3720
=============================================================================
BUG raid5-md0 (Tainted: G    B             ): Objects remaining in raid5-md0 on __kmem_cache_shutdown()
-----------------------------------------------------------------------------

Slab 0xffffea0001d6a700 objects=13 used=5 fp=0xffff888075a9d838 flags=0xfff00000000840(slab|head|node=0|zone=1|lastcpupid=0x7ff)
CPU: 0 PID: 6146 Comm: syz.2.37 Tainted: G    B              syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
Call Trace:
 <TASK>
 dump_stack_lvl+0x18c/0x250 lib/dump_stack.c:106
 slab_err+0x13d/0x170 mm/slub.c:1028
 list_slab_objects+0x38/0x1a0 mm/slub.c:4596
 free_partial mm/slub.c:4629 [inline]
 __kmem_cache_shutdown+0x132/0x230 mm/slub.c:4661
 shutdown_cache mm/slab_common.c:457 [inline]
 kmem_cache_destroy+0x56/0x160 mm/slab_common.c:497
 shrink_stripes drivers/md/raid5.c:2726 [inline]
 free_conf+0x227/0x4b0 drivers/md/raid5.c:7442
 setup_conf+0x16c4/0x2a30 drivers/md/raid5.c:7772
 raid5_takeover_raid1 drivers/md/raid5.c:8825 [inline]
 raid5_takeover+0x61d/0x8a0 drivers/md/raid5.c:8936
 level_store+0x6b1/0x1a90 drivers/md/md.c:4028
 md_attr_store+0x196/0x380 drivers/md/md.c:5637
 kernfs_fop_write_iter+0x3a4/0x520 fs/kernfs/file.c:352
 call_write_iter include/linux/fs.h:2018 [inline]
 new_sync_write fs/read_write.c:491 [inline]
 vfs_write+0x474/0x9a0 fs/read_write.c:584
 ksys_write+0x151/0x260 fs/read_write.c:637
 do_syscall_x64 arch/x86/entry/common.c:46 [inline]
 do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7fe51499e159
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fe51587a028 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007fe514c26180 RCX: 00007fe51499e159
RDX: 0000000000000005 RSI: 0000200000000300 RDI: 0000000000000007
RBP: 00007fe514a3506b R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fe514c26218 R14: 00007fe514c26180 R15: 00007fffe487c228
 </TASK>
Object 0xffff888075a9c000 @offset=0
Object 0xffff888075a9c4d8 @offset=1240
Object 0xffff888075a9c9b0 @offset=2480
Object 0xffff888075a9ce88 @offset=3720
Object 0xffff888075a9d360 @offset=4960
------------[ cut here ]------------
kmem_cache_destroy raid5-md0: Slab cache still has objects when called from shrink_stripes drivers/md/raid5.c:2726 [inline]
kmem_cache_destroy raid5-md0: Slab cache still has objects when called from free_conf+0x227/0x4b0 drivers/md/raid5.c:7442
WARNING: CPU: 0 PID: 6146 at mm/slab_common.c:499 kmem_cache_destroy+0x74/0x160 mm/slab_common.c:498
Modules linked in:
CPU: 0 PID: 6146 Comm: syz.2.37 Tainted: G    B              syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
RIP: 0010:kmem_cache_destroy+0x74/0x160 mm/slab_common.c:498
Code: 52 9d 1a 00 48 89 df e8 ea f3 19 00 85 c0 74 33 48 8b 53 60 48 c7 c7 84 49 89 8c 48 c7 c6 31 71 a6 8c 4c 89 f1 e8 7c e5 8b ff <0f> 0b 48 c7 c7 f0 0a 20 8d e8 5e 83 d4 08 5b 41 5e 41 5f 5d e9 63
RSP: 0018:ffffc90003a47930 EFLAGS: 00010246
RAX: 48dadf66d829e300 RBX: ffff88814d946b40 RCX: ffff888029d81e00
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000002
RBP: 0000000048000000 R08: ffffc90003a47527 R09: 1ffff92000748ea4
R10: dffffc0000000000 R11: fffff52000748ea5 R12: ffff8880257b2000
R13: dffffc0000000000 R14: ffffffff8777c207 R15: 0000000000000000
FS:  00007fe51587a6c0(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fb591de0d58 CR3: 000000005e6c8000 CR4: 00000000003506f0
Call Trace:
 <TASK>
 shrink_stripes drivers/md/raid5.c:2726 [inline]
 free_conf+0x227/0x4b0 drivers/md/raid5.c:7442
 setup_conf+0x16c4/0x2a30 drivers/md/raid5.c:7772
 raid5_takeover_raid1 drivers/md/raid5.c:8825 [inline]
 raid5_takeover+0x61d/0x8a0 drivers/md/raid5.c:8936
 level_store+0x6b1/0x1a90 drivers/md/md.c:4028
 md_attr_store+0x196/0x380 drivers/md/md.c:5637
 kernfs_fop_write_iter+0x3a4/0x520 fs/kernfs/file.c:352
 call_write_iter include/linux/fs.h:2018 [inline]
 new_sync_write fs/read_write.c:491 [inline]
 vfs_write+0x474/0x9a0 fs/read_write.c:584
 ksys_write+0x151/0x260 fs/read_write.c:637
 do_syscall_x64 arch/x86/entry/common.c:46 [inline]
 do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7fe51499e159
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fe51587a028 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007fe514c26180 RCX: 00007fe51499e159
RDX: 0000000000000005 RSI: 0000200000000300 RDI: 0000000000000007
RBP: 00007fe514a3506b R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fe514c26218 R14: 00007fe514c26180 R15: 00007fffe487c228
 </TASK>