BUG: spinlock bad magic on CPU#0, jfsCommit/101
 lock: 0xffff0000ee099c50, .magic: ffff8000, .owner: /-301359144, .owner_cpu: 768
CPU: 0 UID: 0 PID: 101 Comm: jfsCommit Not tainted 6.15.0-rc4-syzkaller-ge0f4c8dd9d2d #0 PREEMPT 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
Call trace:
 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:466 (C)
 __dump_stack+0x30/0x40 lib/dump_stack.c:94
 dump_stack_lvl+0xd8/0x12c lib/dump_stack.c:120
 dump_stack+0x1c/0x28 lib/dump_stack.c:129
 spin_dump+0x104/0x1ec kernel/locking/spinlock_debug.c:70
 spin_bug kernel/locking/spinlock_debug.c:78 [inline]
 debug_spin_lock_before kernel/locking/spinlock_debug.c:86 [inline]
 do_raw_spin_lock+0x1c4/0x2cc kernel/locking/spinlock_debug.c:115
 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:111 [inline]
 _raw_spin_lock_irqsave+0x64/0x7c kernel/locking/spinlock.c:162
 __wake_up_common_lock kernel/sched/wait.c:105 [inline]
 __wake_up+0x40/0x1a8 kernel/sched/wait.c:127
 unlock_metapage fs/jfs/jfs_metapage.c:39 [inline]
 release_metapage+0x164/0xa3c fs/jfs/jfs_metapage.c:763
 xtTruncate+0xb94/0x2734 fs/jfs/jfs_xtree.c:-1
 jfs_free_zero_link+0x2a4/0x410 fs/jfs/namei.c:759
 jfs_evict_inode+0x2f4/0x3e8 fs/jfs/inode.c:153
 evict+0x414/0x928 fs/inode.c:810
 iput_final fs/inode.c:1898 [inline]
 iput+0x6e4/0x83c fs/inode.c:1924
 txUpdateMap+0x798/0x8d0 fs/jfs/jfs_txnmgr.c:2367
 txLazyCommit fs/jfs/jfs_txnmgr.c:2664 [inline]
 jfs_lazycommit+0x394/0x94c fs/jfs/jfs_txnmgr.c:2733
 kthread+0x5fc/0x75c kernel/kthread.c:464
 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:862
------------[ cut here ]------------
UBSAN: array-index-out-of-bounds in kernel/locking/qspinlock.h:68:9
index 8902 is out of range for type 'unsigned long[8]'
CPU: 0 UID: 0 PID: 101 Comm: jfsCommit Not tainted 6.15.0-rc4-syzkaller-ge0f4c8dd9d2d #0 PREEMPT 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
Call trace:
 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:466 (C)
 __dump_stack+0x30/0x40 lib/dump_stack.c:94
 dump_stack_lvl+0xd8/0x12c lib/dump_stack.c:120
 dump_stack+0x1c/0x28 lib/dump_stack.c:129
 ubsan_epilogue+0x14/0x48 lib/ubsan.c:231
 __ubsan_handle_out_of_bounds+0xd0/0xfc lib/ubsan.c:453
 decode_tail kernel/locking/qspinlock.h:68 [inline]
 queued_spin_lock_slowpath+0x9f4/0xaec kernel/locking/qspinlock.c:285
 queued_spin_lock include/asm-generic/qspinlock.h:114 [inline]
 do_raw_spin_lock+0x2a8/0x2cc kernel/locking/spinlock_debug.c:116
 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:111 [inline]
 _raw_spin_lock_irqsave+0x64/0x7c kernel/locking/spinlock.c:162
 __wake_up_common_lock kernel/sched/wait.c:105 [inline]
 __wake_up+0x40/0x1a8 kernel/sched/wait.c:127
 unlock_metapage fs/jfs/jfs_metapage.c:39 [inline]
 release_metapage+0x164/0xa3c fs/jfs/jfs_metapage.c:763
 xtTruncate+0xb94/0x2734 fs/jfs/jfs_xtree.c:-1
 jfs_free_zero_link+0x2a4/0x410 fs/jfs/namei.c:759
 jfs_evict_inode+0x2f4/0x3e8 fs/jfs/inode.c:153
 evict+0x414/0x928 fs/inode.c:810
 iput_final fs/inode.c:1898 [inline]
 iput+0x6e4/0x83c fs/inode.c:1924
 txUpdateMap+0x798/0x8d0 fs/jfs/jfs_txnmgr.c:2367
 txLazyCommit fs/jfs/jfs_txnmgr.c:2664 [inline]
 jfs_lazycommit+0x394/0x94c fs/jfs/jfs_txnmgr.c:2733
 kthread+0x5fc/0x75c kernel/kthread.c:464
 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:862
---[ end trace ]---
==================================================================
BUG: KASAN: use-after-free in queued_spin_lock_slowpath+0x854/0xaec kernel/locking/qspinlock.c:288
Write of size 8 at addr ffff00011e5767f8 by task jfsCommit/101

CPU: 0 UID: 0 PID: 101 Comm: jfsCommit Not tainted 6.15.0-rc4-syzkaller-ge0f4c8dd9d2d #0 PREEMPT 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
Call trace:
 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:466 (C)
 __dump_stack+0x30/0x40 lib/dump_stack.c:94
 dump_stack_lvl+0xd8/0x12c lib/dump_stack.c:120
 print_address_description+0xa8/0x254 mm/kasan/report.c:408
 print_report+0x68/0x84 mm/kasan/report.c:521
 kasan_report+0xb0/0x110 mm/kasan/report.c:634
 __asan_report_store8_noabort+0x20/0x2c mm/kasan/report_generic.c:386
 queued_spin_lock_slowpath+0x854/0xaec kernel/locking/qspinlock.c:288
 queued_spin_lock include/asm-generic/qspinlock.h:114 [inline]
 do_raw_spin_lock+0x2a8/0x2cc kernel/locking/spinlock_debug.c:116
 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:111 [inline]
 _raw_spin_lock_irqsave+0x64/0x7c kernel/locking/spinlock.c:162
 __wake_up_common_lock kernel/sched/wait.c:105 [inline]
 __wake_up+0x40/0x1a8 kernel/sched/wait.c:127
 unlock_metapage fs/jfs/jfs_metapage.c:39 [inline]
 release_metapage+0x164/0xa3c fs/jfs/jfs_metapage.c:763
 xtTruncate+0xb94/0x2734 fs/jfs/jfs_xtree.c:-1
 jfs_free_zero_link+0x2a4/0x410 fs/jfs/namei.c:759
 jfs_evict_inode+0x2f4/0x3e8 fs/jfs/inode.c:153
 evict+0x414/0x928 fs/inode.c:810
 iput_final fs/inode.c:1898 [inline]
 iput+0x6e4/0x83c fs/inode.c:1924
 txUpdateMap+0x798/0x8d0 fs/jfs/jfs_txnmgr.c:2367
 txLazyCommit fs/jfs/jfs_txnmgr.c:2664 [inline]
 jfs_lazycommit+0x394/0x94c fs/jfs/jfs_txnmgr.c:2733
 kthread+0x5fc/0x75c kernel/kthread.c:464
 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:862

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x15e576
flags: 0x5ffc00000000000(node=0|zone=2|lastcpupid=0x7ff)
raw: 05ffc00000000000 fffffdffc4795d88 fffffdffc4795d88 0000000000000000
raw: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff00011e576680: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff00011e576700: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>ffff00011e576780: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                                                                ^
 ffff00011e576800: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff00011e576880: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
==================================================================