BUG: spinlock bad magic on CPU#1, jfsCommit/98 ================================================================== BUG: KASAN: slab-use-after-free in string_nocheck lib/vsprintf.c:639 [inline] BUG: KASAN: slab-use-after-free in string+0x200/0x290 lib/vsprintf.c:721 Read of size 1 at addr ffff0000f645c9c0 by task jfsCommit/98 CPU: 1 UID: 0 PID: 98 Comm: jfsCommit Not tainted 6.16.0-rc2-syzkaller-g9aa9b43d689e #0 PREEMPT Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 Call trace: show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:501 (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_load1_noabort+0x20/0x2c mm/kasan/report_generic.c:378 string_nocheck lib/vsprintf.c:639 [inline] string+0x200/0x290 lib/vsprintf.c:721 vsnprintf+0x814/0xd60 lib/vsprintf.c:2874 vprintk_store+0x308/0xac8 kernel/printk/printk.c:2279 vprintk_emit+0x224/0x430 kernel/printk/printk.c:2426 vprintk_default+0x54/0x80 kernel/printk/printk.c:2465 vprintk+0x90/0x128 kernel/printk/printk_safe.c:82 _printk+0xd0/0x118 kernel/printk/printk.c:2475 spin_dump+0x100/0x1ec kernel/locking/spinlock_debug.c:64 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:40 [inline] release_metapage+0x164/0xa3c fs/jfs/jfs_metapage.c:869 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:847 Allocated by task 8639: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x40/0x78 mm/kasan/common.c:68 kasan_save_alloc_info+0x44/0x54 mm/kasan/generic.c:562 unpoison_slab_object mm/kasan/common.c:319 [inline] __kasan_slab_alloc+0x70/0x88 mm/kasan/common.c:345 kasan_slab_alloc include/linux/kasan.h:250 [inline] slab_post_alloc_hook mm/slub.c:4148 [inline] slab_alloc_node mm/slub.c:4197 [inline] kmem_cache_alloc_lru_noprof+0x23c/0x3ec mm/slub.c:4216 jfs_alloc_inode+0x2c/0x68 fs/jfs/super.c:105 alloc_inode+0x68/0x19c fs/inode.c:346 new_inode+0x2c/0x130 fs/inode.c:1145 diReadSpecial+0x58/0x5e0 fs/jfs/jfs_imap.c:426 jfs_mount+0x88/0x750 fs/jfs/jfs_mount.c:87 jfs_fill_super+0x53c/0xb80 fs/jfs/super.c:523 get_tree_bdev_flags+0x360/0x414 fs/super.c:1679 get_tree_bdev+0x2c/0x3c fs/super.c:1702 jfs_get_tree+0x28/0x38 fs/jfs/super.c:635 vfs_get_tree+0x90/0x28c fs/super.c:1802 do_new_mount+0x228/0x814 fs/namespace.c:3885 path_mount+0x5b4/0xde0 fs/namespace.c:4209 do_mount fs/namespace.c:4222 [inline] __do_sys_mount fs/namespace.c:4433 [inline] __se_sys_mount fs/namespace.c:4410 [inline] __arm64_sys_mount+0x3e8/0x468 fs/namespace.c:4410 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:49 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151 el0_svc+0x58/0x17c arch/arm64/kernel/entry-common.c:767 el0t_64_sync_handler+0x78/0x108 arch/arm64/kernel/entry-common.c:786 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:600 Freed by task 23: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x40/0x78 mm/kasan/common.c:68 kasan_save_free_info+0x58/0x70 mm/kasan/generic.c:576 poison_slab_object mm/kasan/common.c:247 [inline] __kasan_slab_free+0x68/0x88 mm/kasan/common.c:264 kasan_slab_free include/linux/kasan.h:233 [inline] slab_free_hook mm/slub.c:2381 [inline] slab_free mm/slub.c:4643 [inline] kmem_cache_free+0x184/0x550 mm/slub.c:4745 jfs_free_inode+0x28/0x38 fs/jfs/super.c:116 i_callback+0x50/0x78 fs/inode.c:325 rcu_do_batch kernel/rcu/tree.c:2576 [inline] rcu_core+0x848/0x17a4 kernel/rcu/tree.c:2832 rcu_core_si+0x10/0x1c kernel/rcu/tree.c:2849 handle_softirqs+0x328/0xc88 kernel/softirq.c:579 run_ksoftirqd+0x70/0xc0 kernel/softirq.c:968 smpboot_thread_fn+0x4d8/0x9cc kernel/smpboot.c:164 kthread+0x5fc/0x75c kernel/kthread.c:464 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:847 Last potentially related work creation: kasan_save_stack+0x40/0x6c mm/kasan/common.c:47 kasan_record_aux_stack+0xb0/0xc8 mm/kasan/generic.c:548 __call_rcu_common kernel/rcu/tree.c:3090 [inline] call_rcu+0xfc/0x96c kernel/rcu/tree.c:3210 destroy_inode fs/inode.c:401 [inline] evict+0x754/0x928 fs/inode.c:834 iput_final fs/inode.c:1898 [inline] iput+0x6e4/0x83c fs/inode.c:1924 diFreeSpecial+0x78/0x100 fs/jfs/jfs_imap.c:552 jfs_umount+0x1c0/0x350 fs/jfs/jfs_umount.c:81 jfs_put_super+0x90/0x188 fs/jfs/super.c:194 generic_shutdown_super+0x12c/0x2b8 fs/super.c:643 kill_block_super+0x44/0x90 fs/super.c:1753 deactivate_locked_super+0xc4/0x12c fs/super.c:474 deactivate_super+0xe0/0x100 fs/super.c:507 cleanup_mnt+0x31c/0x3ac fs/namespace.c:1417 __cleanup_mnt+0x20/0x30 fs/namespace.c:1424 task_work_run+0x1dc/0x260 kernel/task_work.c:227 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline] do_notify_resume+0x16c/0x1ec arch/arm64/kernel/entry-common.c:151 exit_to_user_mode_prepare arch/arm64/kernel/entry-common.c:169 [inline] exit_to_user_mode arch/arm64/kernel/entry-common.c:178 [inline] el0_svc+0xb4/0x17c arch/arm64/kernel/entry-common.c:768 el0t_64_sync_handler+0x78/0x108 arch/arm64/kernel/entry-common.c:786 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:600 The buggy address belongs to the object at ffff0000f645c9c0 which belongs to the cache jfs_ip of size 2232 The buggy address is located 0 bytes inside of freed 2232-byte region [ffff0000f645c9c0, ffff0000f645d278) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff0000f6458938 pfn:0x136458 head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 memcg:ffff0000f40f6301 flags: 0x5ffc00000000040(head|node=0|zone=2|lastcpupid=0x7ff) page_type: f5(slab) raw: 05ffc00000000040 ffff0000c49e0640 dead000000000122 0000000000000000 raw: ffff0000f6458938 00000000800d000a 00000000f5000000 ffff0000f40f6301 head: 05ffc00000000040 ffff0000c49e0640 dead000000000122 0000000000000000 head: ffff0000f6458938 00000000800d000a 00000000f5000000 ffff0000f40f6301 head: 05ffc00000000003 fffffdffc3d91601 00000000ffffffff 00000000ffffffff head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000008 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff0000f645c880: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff0000f645c900: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc >ffff0000f645c980: fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb ^ ffff0000f645ca00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff0000f645ca80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== lock: 0xffff0000f645c130, .magic: ffff8000, .owner: /-163199816, .owner_cpu: 768 CPU: 1 UID: 0 PID: 98 Comm: jfsCommit Tainted: G B 6.16.0-rc2-syzkaller-g9aa9b43d689e #0 PREEMPT Tainted: [B]=BAD_PAGE Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 Call trace: show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:501 (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:40 [inline] release_metapage+0x164/0xa3c fs/jfs/jfs_metapage.c:869 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:847 ------------[ cut here ]------------ UBSAN: array-index-out-of-bounds in kernel/locking/qspinlock.h:68:9 index 8907 is out of range for type 'unsigned long[8]' CPU: 1 UID: 0 PID: 98 Comm: jfsCommit Tainted: G B 6.16.0-rc2-syzkaller-g9aa9b43d689e #0 PREEMPT Tainted: [B]=BAD_PAGE Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 Call trace: show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:501 (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:233 __ubsan_handle_out_of_bounds+0xd0/0xfc lib/ubsan.c:455 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:40 [inline] release_metapage+0x164/0xa3c fs/jfs/jfs_metapage.c:869 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:847 ---[ end trace ]---