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BUG: KASAN: use-after-free in __lock_acquire+0x104/0x6634 kernel/locking/lockdep.c:4933
Read of size 8 at addr ffff0000ce5fd928 by task kworker/0:1/12804

CPU: 0 PID: 12804 Comm: kworker/0:1 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/14/2026
Workqueue: md_misc md_start_sync
Call trace:
 dump_backtrace+0x1c4/0x1f0 arch/arm64/kernel/stacktrace.c:158
 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:165
 __dump_stack+0x30/0x40 lib/dump_stack.c:88
 dump_stack_lvl+0xf4/0x15c lib/dump_stack.c:106
 print_address_description+0x88/0x218 mm/kasan/report.c:316
 print_report+0x50/0x68 mm/kasan/report.c:420
 kasan_report+0xa8/0xfc mm/kasan/report.c:524
 __asan_report_load8_noabort+0x2c/0x38 mm/kasan/report_generic.c:351
 __lock_acquire+0x104/0x6634 kernel/locking/lockdep.c:4933
 lock_acquire+0x20c/0x638 kernel/locking/lockdep.c:5678
 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
 _raw_spin_lock_irqsave+0x6c/0xb0 kernel/locking/spinlock.c:162
 __wake_up_common_lock kernel/sched/wait.c:137 [inline]
 __wake_up+0xe8/0x180 kernel/sched/wait.c:160
 md_wakeup_thread drivers/md/md.c:8018 [inline]
 md_start_sync+0x9c/0x3b4 drivers/md/md.c:9356
 process_one_work+0x7e4/0x13bc kernel/workqueue.c:2292
 worker_thread+0x8cc/0xfe8 kernel/workqueue.c:2439
 kthread+0x254/0x2e0 kernel/kthread.c:376
 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:850

Allocated by task 12804:
 kasan_save_stack mm/kasan/common.c:46 [inline]
 kasan_set_track+0x4c/0x80 mm/kasan/common.c:53
 kasan_save_alloc_info+0x24/0x30 mm/kasan/generic.c:505
 ____kasan_kmalloc mm/kasan/common.c:375 [inline]
 __kasan_kmalloc+0xa0/0xb8 mm/kasan/common.c:384
 kasan_kmalloc include/linux/kasan.h:211 [inline]
 kmalloc_trace+0x7c/0x94 mm/slab_common.c:1031
 kmalloc include/linux/slab.h:563 [inline]
 kzalloc include/linux/slab.h:699 [inline]
 md_register_thread+0x64/0x1ac drivers/md/md.c:8028
 md_start_sync+0x3c/0x3b4 drivers/md/md.c:9338
 process_one_work+0x7e4/0x13bc kernel/workqueue.c:2292
 worker_thread+0x8cc/0xfe8 kernel/workqueue.c:2439
 kthread+0x254/0x2e0 kernel/kthread.c:376
 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:850

Freed by task 14208:
 kasan_save_stack mm/kasan/common.c:46 [inline]
 kasan_set_track+0x4c/0x80 mm/kasan/common.c:53
 kasan_save_free_info+0x38/0x5c mm/kasan/generic.c:516
 ____kasan_slab_free+0x148/0x1b0 mm/kasan/common.c:237
 __kasan_slab_free+0x18/0x28 mm/kasan/common.c:245
 kasan_slab_free include/linux/kasan.h:177 [inline]
 slab_free_hook mm/slub.c:1729 [inline]
 slab_free_freelist_hook+0x16c/0x1e8 mm/slub.c:1755
 slab_free mm/slub.c:3687 [inline]
 __kmem_cache_free+0xbc/0x21c mm/slub.c:3700
 kfree+0xd0/0x1a8 mm/slab_common.c:988
 md_unregister_thread+0x9c/0x12c drivers/md/md.c:8068
 md_check_recovery+0x8bc/0x1334 drivers/md/md.c:9490
 raid5d+0x108/0x1394 drivers/md/raid5.c:6802
 md_thread+0x1e0/0x3cc drivers/md/md.c:8007
 kthread+0x254/0x2e0 kernel/kthread.c:376
 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:850

Last potentially related work creation:
 kasan_save_stack+0x40/0x70 mm/kasan/common.c:46
 __kasan_record_aux_stack+0xc0/0xdc mm/kasan/generic.c:486
 kasan_record_aux_stack_noalloc+0x14/0x20 mm/kasan/generic.c:496
 kvfree_call_rcu+0xb4/0x6f0 kernel/rcu/tree.c:3405
 cfg80211_update_known_bss+0x11c/0x7fc net/wireless/scan.c:-1
 cfg80211_bss_update+0x150/0x1ccc net/wireless/scan.c:1847
 cfg80211_inform_single_bss_frame_data net/wireless/scan.c:2509 [inline]
 cfg80211_inform_bss_frame_data+0x890/0x10f8 net/wireless/scan.c:2542
 ieee80211_bss_info_update+0x640/0xa7c net/mac80211/scan.c:190
 ieee80211_rx_bss_info net/mac80211/ibss.c:1120 [inline]
 ieee80211_rx_mgmt_probe_beacon net/mac80211/ibss.c:1609 [inline]
 ieee80211_ibss_rx_queued_mgmt+0x143c/0x2608 net/mac80211/ibss.c:1638
 ieee80211_iface_process_skb net/mac80211/iface.c:1685 [inline]
 ieee80211_iface_work+0x5a8/0xa4c net/mac80211/iface.c:1739
 cfg80211_wiphy_work+0x1e0/0x220 net/wireless/core.c:433
 process_one_work+0x7e4/0x13bc kernel/workqueue.c:2292
 worker_thread+0x8cc/0xfe8 kernel/workqueue.c:2439
 kthread+0x254/0x2e0 kernel/kthread.c:376
 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:850

Second to last potentially related work creation:
 kasan_save_stack+0x40/0x70 mm/kasan/common.c:46
 __kasan_record_aux_stack+0xc0/0xdc mm/kasan/generic.c:486
 kasan_record_aux_stack_noalloc+0x14/0x20 mm/kasan/generic.c:496
 kvfree_call_rcu+0xb4/0x6f0 kernel/rcu/tree.c:3405
 cfg80211_update_known_bss+0x11c/0x7fc net/wireless/scan.c:-1
 cfg80211_bss_update+0x150/0x1ccc net/wireless/scan.c:1847
 cfg80211_inform_single_bss_frame_data net/wireless/scan.c:2509 [inline]
 cfg80211_inform_bss_frame_data+0x890/0x10f8 net/wireless/scan.c:2542
 ieee80211_bss_info_update+0x640/0xa7c net/mac80211/scan.c:190
 ieee80211_rx_bss_info net/mac80211/ibss.c:1120 [inline]
 ieee80211_rx_mgmt_probe_beacon net/mac80211/ibss.c:1609 [inline]
 ieee80211_ibss_rx_queued_mgmt+0x143c/0x2608 net/mac80211/ibss.c:1638
 ieee80211_iface_process_skb net/mac80211/iface.c:1685 [inline]
 ieee80211_iface_work+0x5a8/0xa4c net/mac80211/iface.c:1739
 cfg80211_wiphy_work+0x1e0/0x220 net/wireless/core.c:433
 process_one_work+0x7e4/0x13bc kernel/workqueue.c:2292
 worker_thread+0x8cc/0xfe8 kernel/workqueue.c:2439
 kthread+0x254/0x2e0 kernel/kthread.c:376
 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:850

The buggy address belongs to the object at ffff0000ce5fd900
 which belongs to the cache kmalloc-128 of size 128
The buggy address is located 40 bytes inside of
 128-byte region [ffff0000ce5fd900, ffff0000ce5fd980)

The buggy address belongs to the physical page:
page:00000000050d0685 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x10e5fd
flags: 0x5ffc00000000200(slab|node=0|zone=2|lastcpupid=0x7ff)
raw: 05ffc00000000200 0000000000000000 dead000000000001 ffff0000c0002300
raw: 0000000000000000 0000000000100010 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff0000ce5fd800: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff0000ce5fd880: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff0000ce5fd900: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                  ^
 ffff0000ce5fd980: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff0000ce5fda00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
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