BUG: spinlock bad magic on CPU#0, jfsCommit/100 ================================================================== BUG: KASAN: slab-use-after-free in string_nocheck lib/vsprintf.c:653 [inline] BUG: KASAN: slab-use-after-free in string+0x200/0x290 lib/vsprintf.c:735 Read of size 1 at addr ffff0000f7ce6508 by task jfsCommit/100 CPU: 0 UID: 0 PID: 100 Comm: jfsCommit Not tainted syzkaller #0 PREEMPT Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/03/2025 Call trace: show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:499 (C) __dump_stack+0x30/0x40 lib/dump_stack.c:94 dump_stack_lvl+0xd8/0x12c lib/dump_stack.c:120 print_address_description+0xa8/0x238 mm/kasan/report.c:378 print_report+0x68/0x84 mm/kasan/report.c:482 kasan_report+0xb0/0x110 mm/kasan/report.c:595 __asan_report_load1_noabort+0x20/0x2c mm/kasan/report_generic.c:378 string_nocheck lib/vsprintf.c:653 [inline] string+0x200/0x290 lib/vsprintf.c:735 vsnprintf+0x814/0xd60 lib/vsprintf.c:2926 vprintk_store+0x308/0xac8 kernel/printk/printk.c:2252 vprintk_emit+0x160/0x318 kernel/printk/printk.c:2399 vprintk_default+0x54/0x80 kernel/printk/printk.c:2438 vprintk+0x90/0x128 kernel/printk/printk_safe.c:82 _printk+0xd0/0x118 kernel/printk/printk.c:2448 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:124 [inline] __wake_up+0x40/0x1a8 kernel/sched/wait.c:146 unlock_metapage fs/jfs/jfs_metapage.c:40 [inline] release_metapage+0x164/0xa3c fs/jfs/jfs_metapage.c:871 xtTruncate+0xbe4/0x27ac 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:159 evict+0x414/0x928 fs/inode.c:810 iput_final fs/inode.c:1914 [inline] iput+0x95c/0xad4 fs/inode.c:1966 txUpdateMap+0x798/0x8d0 fs/jfs/jfs_txnmgr.c:2368 txLazyCommit fs/jfs/jfs_txnmgr.c:2665 [inline] jfs_lazycommit+0x394/0x94c fs/jfs/jfs_txnmgr.c:2734 kthread+0x5fc/0x75c kernel/kthread.c:463 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:844 Allocated by task 7339: kasan_save_stack mm/kasan/common.c:56 [inline] kasan_save_track+0x40/0x78 mm/kasan/common.c:77 kasan_save_alloc_info+0x44/0x54 mm/kasan/generic.c:573 unpoison_slab_object mm/kasan/common.c:342 [inline] __kasan_slab_alloc+0x70/0x88 mm/kasan/common.c:368 kasan_slab_alloc include/linux/kasan.h:252 [inline] slab_post_alloc_hook mm/slub.c:4970 [inline] slab_alloc_node mm/slub.c:5280 [inline] kmem_cache_alloc_lru_noprof+0x33c/0x64c mm/slub.c:5299 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+0x304/0x750 fs/jfs/jfs_mount.c:166 jfs_fill_super+0x53c/0xb6c fs/jfs/super.c:523 get_tree_bdev_flags+0x360/0x414 fs/super.c:1691 get_tree_bdev+0x2c/0x3c fs/super.c:1714 jfs_get_tree+0x28/0x38 fs/jfs/super.c:635 vfs_get_tree+0x90/0x28c fs/super.c:1751 fc_mount fs/namespace.c:1208 [inline] do_new_mount_fc fs/namespace.c:3651 [inline] do_new_mount+0x284/0x944 fs/namespace.c:3727 path_mount+0x5b4/0xdfc fs/namespace.c:4037 do_mount fs/namespace.c:4050 [inline] __do_sys_mount fs/namespace.c:4238 [inline] __se_sys_mount fs/namespace.c:4215 [inline] __arm64_sys_mount+0x3e8/0x468 fs/namespace.c:4215 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x254 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+0x5c/0x254 arch/arm64/kernel/entry-common.c:746 el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:765 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596 Freed by task 7329: kasan_save_stack mm/kasan/common.c:56 [inline] kasan_save_track+0x40/0x78 mm/kasan/common.c:77 __kasan_save_free_info+0x58/0x70 mm/kasan/generic.c:587 kasan_save_free_info mm/kasan/kasan.h:406 [inline] poison_slab_object mm/kasan/common.c:252 [inline] __kasan_slab_free+0x74/0xa4 mm/kasan/common.c:284 kasan_slab_free include/linux/kasan.h:234 [inline] slab_free_hook mm/slub.c:2539 [inline] slab_free mm/slub.c:6630 [inline] kmem_cache_free+0x18c/0x6dc mm/slub.c:6740 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:2605 [inline] rcu_core+0x840/0x17d0 kernel/rcu/tree.c:2861 rcu_core_si+0x10/0x1c kernel/rcu/tree.c:2878 handle_softirqs+0x328/0xc88 kernel/softirq.c:622 __do_softirq+0x14/0x20 kernel/softirq.c:656 Last potentially related work creation: kasan_save_stack+0x40/0x6c mm/kasan/common.c:56 kasan_record_aux_stack+0xb0/0xc8 mm/kasan/generic.c:559 __call_rcu_common kernel/rcu/tree.c:3123 [inline] call_rcu+0x100/0x978 kernel/rcu/tree.c:3243 destroy_inode fs/inode.c:401 [inline] evict+0x754/0x928 fs/inode.c:834 iput_final fs/inode.c:1914 [inline] iput+0x95c/0xad4 fs/inode.c:1966 diFreeSpecial+0x78/0x100 fs/jfs/jfs_imap.c:552 jfs_umount+0x15c/0x350 fs/jfs/jfs_umount.c:65 jfs_put_super+0x90/0x188 fs/jfs/super.c:194 generic_shutdown_super+0x12c/0x2b8 fs/super.c:642 kill_block_super+0x44/0x90 fs/super.c:1722 deactivate_locked_super+0xc4/0x12c fs/super.c:473 deactivate_super+0xe0/0x100 fs/super.c:506 cleanup_mnt+0x31c/0x3ac fs/namespace.c:1327 __cleanup_mnt+0x20/0x30 fs/namespace.c:1334 task_work_run+0x1dc/0x260 kernel/task_work.c:227 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline] exit_to_user_mode_loop+0xfc/0x178 kernel/entry/common.c:43 exit_to_user_mode_prepare include/linux/irq-entry-common.h:225 [inline] arm64_exit_to_user_mode arch/arm64/kernel/entry-common.c:103 [inline] el0_svc+0x170/0x254 arch/arm64/kernel/entry-common.c:747 el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:765 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596 The buggy address belongs to the object at ffff0000f7ce64b8 which belongs to the cache jfs_ip of size 2216 The buggy address is located 80 bytes inside of freed 2216-byte region [ffff0000f7ce64b8, ffff0000f7ce6d60) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x137ce0 head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 memcg:ffff0000dd6c9001 flags: 0x5ffc00000000040(head|node=0|zone=2|lastcpupid=0x7ff) page_type: f5(slab) raw: 05ffc00000000040 ffff0000c4beeb40 dead000000000122 0000000000000000 raw: 0000000000000000 00000000800d000d 00000000f5000000 ffff0000dd6c9001 head: 05ffc00000000040 ffff0000c4beeb40 dead000000000122 0000000000000000 head: 0000000000000000 00000000800d000d 00000000f5000000 ffff0000dd6c9001 head: 05ffc00000000003 fffffdffc3df3801 00000000ffffffff 00000000ffffffff head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000008 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff0000f7ce6400: 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc fc ffff0000f7ce6480: fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb fb >ffff0000f7ce6500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff0000f7ce6580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff0000f7ce6600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== lock: 0xffff0000f7ce5c38, .magic: ffff8000, .owner: ˜VÎ÷/768, .owner_cpu: 768 CPU: 0 UID: 0 PID: 100 Comm: jfsCommit Tainted: G B syzkaller #0 PREEMPT Tainted: [B]=BAD_PAGE Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/03/2025 Call trace: show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:499 (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:124 [inline] __wake_up+0x40/0x1a8 kernel/sched/wait.c:146 unlock_metapage fs/jfs/jfs_metapage.c:40 [inline] release_metapage+0x164/0xa3c fs/jfs/jfs_metapage.c:871 xtTruncate+0xbe4/0x27ac 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:159 evict+0x414/0x928 fs/inode.c:810 iput_final fs/inode.c:1914 [inline] iput+0x95c/0xad4 fs/inode.c:1966 txUpdateMap+0x798/0x8d0 fs/jfs/jfs_txnmgr.c:2368 txLazyCommit fs/jfs/jfs_txnmgr.c:2665 [inline] jfs_lazycommit+0x394/0x94c fs/jfs/jfs_txnmgr.c:2734 kthread+0x5fc/0x75c kernel/kthread.c:463 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:844 ------------[ cut here ]------------ UBSAN: array-index-out-of-bounds in kernel/locking/qspinlock.h:68:9 index 8904 is out of range for type 'unsigned long[8]' CPU: 0 UID: 0 PID: 100 Comm: jfsCommit Tainted: G B syzkaller #0 PREEMPT Tainted: [B]=BAD_PAGE Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/03/2025 Call trace: show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:499 (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:124 [inline] __wake_up+0x40/0x1a8 kernel/sched/wait.c:146 unlock_metapage fs/jfs/jfs_metapage.c:40 [inline] release_metapage+0x164/0xa3c fs/jfs/jfs_metapage.c:871 xtTruncate+0xbe4/0x27ac 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:159 evict+0x414/0x928 fs/inode.c:810 iput_final fs/inode.c:1914 [inline] iput+0x95c/0xad4 fs/inode.c:1966 txUpdateMap+0x798/0x8d0 fs/jfs/jfs_txnmgr.c:2368 txLazyCommit fs/jfs/jfs_txnmgr.c:2665 [inline] jfs_lazycommit+0x394/0x94c fs/jfs/jfs_txnmgr.c:2734 kthread+0x5fc/0x75c kernel/kthread.c:463 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:844 ---[ end trace ]--- Unable to handle kernel paging request at virtual address ffff7d0e9ed793a7 KASAN: probably wild-memory-access in range [0xffffe874f6bc9d38-0xffffe874f6bc9d3f] Mem abort info: ESR = 0x0000000096000004 EC = 0x25: DABT (current EL), IL = 32 bits SET = 0, FnV = 0 EA = 0, S1PTW = 0 FSC = 0x04: level 0 translation fault Data abort info: ISV = 0, ISS = 0x00000004, ISS2 = 0x00000000 CM = 0, WnR = 0, TnD = 0, TagAccess = 0 GCS = 0, Overlay = 0, DirtyBit = 0, Xs = 0 swapper pgtable: 4k pages, 48-bit VAs, pgdp=000000020728d000 [ffff7d0e9ed793a7] pgd=0000000000000000, p4d=0000000000000000 Internal error: Oops: 0000000096000004 [#1] SMP Modules linked in: CPU: 0 UID: 0 PID: 100 Comm: jfsCommit Tainted: G B syzkaller #0 PREEMPT Tainted: [B]=BAD_PAGE Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/03/2025 pstate: 834000c5 (Nzcv daIF +PAN -UAO +TCO +DIT -SSBS BTYPE=--) pc : queued_spin_lock_slowpath+0x844/0xaec kernel/locking/qspinlock.c:288 lr : decode_tail kernel/locking/qspinlock.h:68 [inline] lr : queued_spin_lock_slowpath+0x9f4/0xaec kernel/locking/qspinlock.c:285 sp : ffff8000993e7340 x29: ffff8000993e73e0 x28: 1fffe0001ef9cb87 x27: ffff80008f4e37d0 x26: ffffe874f6bc9d3c x25: dfff800000000000 x24: ffff70001327ce6c x23: ffff00019bef17c8 x22: 1fffe000337de2f8 x21: ffff00019bef17c0 x20: ffff0000c5439ed0 x19: ffff0000f7ce5c38 x18: 00000000ffffffff x17: 363a682e6b636f6c x16: ffff800082deb6c0 x15: ffff7000125cd060 x14: 1ffff000125cd060 x13: 0000000000000004 x12: ffffffffffffffff x11: ffff7000125cd060 x10: ffff80008f4e37c0 x9 : 0000000000000001 x8 : 1ffffd0e9ed793a7 x7 : 0000000000000001 x6 : ffff800080564a40 x5 : 0000000000000000 x4 : 0000000000000000 x3 : ffff8000803bfab8 x2 : 0000000000000001 x1 : 0000000000000002 x0 : 00000000ffffffff Call trace: queued_spin_lock_slowpath+0x844/0xaec kernel/locking/qspinlock.c:288 (P) 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:124 [inline] __wake_up+0x40/0x1a8 kernel/sched/wait.c:146 unlock_metapage fs/jfs/jfs_metapage.c:40 [inline] release_metapage+0x164/0xa3c fs/jfs/jfs_metapage.c:871 xtTruncate+0xbe4/0x27ac 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:159 evict+0x414/0x928 fs/inode.c:810 iput_final fs/inode.c:1914 [inline] iput+0x95c/0xad4 fs/inode.c:1966 txUpdateMap+0x798/0x8d0 fs/jfs/jfs_txnmgr.c:2368 txLazyCommit fs/jfs/jfs_txnmgr.c:2665 [inline] jfs_lazycommit+0x394/0x94c fs/jfs/jfs_txnmgr.c:2734 kthread+0x5fc/0x75c kernel/kthread.c:463 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:844 Code: 974e8b18 f9400348 8b1b011a d343ff48 (38796908) ---[ end trace 0000000000000000 ]--- ---------------- Code disassembly (best guess): 0: 974e8b18 bl 0xfffffffffd3a2c60 4: f9400348 ldr x8, [x26] 8: 8b1b011a add x26, x8, x27 c: d343ff48 lsr x8, x26, #3 * 10: 38796908 ldrb w8, [x8, x25] <-- trapping instruction