BUG: spinlock bad magic on CPU#1, jfsCommit/113 ================================================================== BUG: KASAN: slab-use-after-free in string_nocheck lib/vsprintf.c:655 [inline] BUG: KASAN: slab-use-after-free in string+0x231/0x2b0 lib/vsprintf.c:737 Read of size 1 at addr ffff888078f849a8 by task jfsCommit/113 CPU: 1 UID: 0 PID: 113 Comm: jfsCommit Tainted: G L syzkaller #0 PREEMPT(full) Tainted: [L]=SOFTLOCKUP Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 Call Trace: dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:378 [inline] print_report+0xca/0x240 mm/kasan/report.c:482 kasan_report+0x118/0x150 mm/kasan/report.c:595 string_nocheck lib/vsprintf.c:655 [inline] string+0x231/0x2b0 lib/vsprintf.c:737 vsnprintf+0x739/0xee0 lib/vsprintf.c:2948 vprintk_store+0x3ac/0xcc0 kernel/printk/printk.c:2257 vprintk_emit+0x187/0x550 kernel/printk/printk.c:2404 _printk+0xcf/0x120 kernel/printk/printk.c:2453 spin_dump+0x102/0x1a0 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+0x1ca/0x290 kernel/locking/spinlock_debug.c:115 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:133 [inline] _raw_spin_lock_irqsave+0x4c/0x60 kernel/locking/spinlock.c:162 __wake_up_common_lock+0x2f/0x1f0 kernel/sched/wait.c:124 unlock_metapage fs/jfs/jfs_metapage.c:40 [inline] release_metapage+0x13c/0xac0 fs/jfs/jfs_metapage.c:871 xtTruncate+0xe84/0x2e70 fs/jfs/jfs_xtree.c:-1 jfs_free_zero_link+0x33a/0x4a0 fs/jfs/namei.c:759 jfs_evict_inode+0x363/0x440 fs/jfs/inode.c:159 evict+0x5f4/0xae0 fs/inode.c:837 txLazyCommit fs/jfs/jfs_txnmgr.c:2665 [inline] jfs_lazycommit+0x43f/0xa90 fs/jfs/jfs_txnmgr.c:2734 kthread+0x389/0x480 kernel/kthread.c:467 ret_from_fork+0x510/0xa50 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246 Allocated by task 10267: kasan_save_stack mm/kasan/common.c:57 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:78 unpoison_slab_object mm/kasan/common.c:340 [inline] __kasan_slab_alloc+0x6c/0x80 mm/kasan/common.c:366 kasan_slab_alloc include/linux/kasan.h:253 [inline] slab_post_alloc_hook mm/slub.c:4969 [inline] slab_alloc_node mm/slub.c:5283 [inline] kmem_cache_alloc_lru_noprof+0x36c/0x6e0 mm/slub.c:5302 jfs_alloc_inode+0x28/0x70 fs/jfs/super.c:105 alloc_inode+0x6a/0x1b0 fs/inode.c:346 new_inode+0x22/0x170 fs/inode.c:1175 diReadSpecial+0x52/0x710 fs/jfs/jfs_imap.c:426 jfs_mount+0x2a2/0x870 fs/jfs/jfs_mount.c:138 jfs_fill_super+0x6bc/0xd80 fs/jfs/super.c:523 get_tree_bdev_flags+0x40e/0x4d0 fs/super.c:1691 vfs_get_tree+0x92/0x2a0 fs/super.c:1751 fc_mount fs/namespace.c:1193 [inline] do_new_mount_fc fs/namespace.c:3630 [inline] do_new_mount+0x302/0xa10 fs/namespace.c:3706 do_mount fs/namespace.c:4029 [inline] __do_sys_mount fs/namespace.c:4218 [inline] __se_sys_mount+0x313/0x410 fs/namespace.c:4195 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xec/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f Freed by task 23: kasan_save_stack mm/kasan/common.c:57 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:78 kasan_save_free_info+0x46/0x50 mm/kasan/generic.c:584 poison_slab_object mm/kasan/common.c:253 [inline] __kasan_slab_free+0x5c/0x80 mm/kasan/common.c:285 kasan_slab_free include/linux/kasan.h:235 [inline] slab_free_hook mm/slub.c:2556 [inline] slab_free mm/slub.c:6690 [inline] kmem_cache_free+0x197/0x620 mm/slub.c:6801 rcu_do_batch kernel/rcu/tree.c:2617 [inline] rcu_core+0x7bd/0x1060 kernel/rcu/tree.c:2869 handle_softirqs+0x22b/0x7c0 kernel/softirq.c:626 run_ksoftirqd+0x36/0x60 kernel/softirq.c:1067 smpboot_thread_fn+0x542/0xa60 kernel/smpboot.c:160 kthread+0x389/0x480 kernel/kthread.c:467 ret_from_fork+0x510/0xa50 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246 Last potentially related work creation: kasan_save_stack+0x3e/0x60 mm/kasan/common.c:57 kasan_record_aux_stack+0xbd/0xd0 mm/kasan/generic.c:556 __call_rcu_common kernel/rcu/tree.c:3131 [inline] call_rcu+0xee/0x890 kernel/rcu/tree.c:3251 destroy_inode fs/inode.c:401 [inline] evict+0x931/0xae0 fs/inode.c:861 jfs_umount+0x1df/0x3c0 fs/jfs/jfs_umount.c:73 jfs_put_super+0x8c/0x190 fs/jfs/super.c:194 generic_shutdown_super+0x135/0x2c0 fs/super.c:643 kill_block_super+0x44/0x90 fs/super.c:1722 deactivate_locked_super+0xbc/0x130 fs/super.c:474 cleanup_mnt+0x425/0x4c0 fs/namespace.c:1312 task_work_run+0x1d4/0x260 kernel/task_work.c:233 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline] __exit_to_user_mode_loop kernel/entry/common.c:44 [inline] exit_to_user_mode_loop+0xef/0x4e0 kernel/entry/common.c:75 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:226 [inline] syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:256 [inline] syscall_exit_to_user_mode_work include/linux/entry-common.h:159 [inline] syscall_exit_to_user_mode include/linux/entry-common.h:194 [inline] do_syscall_64+0x2c1/0xf80 arch/x86/entry/syscall_64.c:100 entry_SYSCALL_64_after_hwframe+0x77/0x7f The buggy address belongs to the object at ffff888078f84940 which belongs to the cache jfs_ip of size 2216 The buggy address is located 104 bytes inside of freed 2216-byte region [ffff888078f84940, ffff888078f851e8) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x78f80 head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 memcg:ffff88802a07d401 flags: 0xfff00000000040(head|node=0|zone=1|lastcpupid=0x7ff) page_type: f5(slab) raw: 00fff00000000040 ffff88801cf63500 dead000000000122 0000000000000000 raw: 0000000000000000 00000000800d000d 00000000f5000000 ffff88802a07d401 head: 00fff00000000040 ffff88801cf63500 dead000000000122 0000000000000000 head: 0000000000000000 00000000800d000d 00000000f5000000 ffff88802a07d401 head: 00fff00000000003 ffffea0001e3e001 00000000ffffffff 00000000ffffffff head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000008 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 3, migratetype Reclaimable, gfp_mask 0xd2050(__GFP_RECLAIMABLE|__GFP_IO|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 6531, tgid 6515 (syz.0.110), ts 146228231784, free_ts 126059520698 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x23d/0x2a0 mm/page_alloc.c:1887 prep_new_page mm/page_alloc.c:1895 [inline] get_page_from_freelist+0x23a5/0x2440 mm/page_alloc.c:3948 __alloc_frozen_pages_noprof+0x181/0x370 mm/page_alloc.c:5257 alloc_pages_mpol+0x232/0x4a0 mm/mempolicy.c:2486 alloc_slab_page mm/slub.c:3091 [inline] allocate_slab+0x86/0x3b0 mm/slub.c:3264 new_slab mm/slub.c:3318 [inline] ___slab_alloc+0xdb6/0x17b0 mm/slub.c:4672 __slab_alloc+0x65/0x100 mm/slub.c:4795 __slab_alloc_node mm/slub.c:4871 [inline] slab_alloc_node mm/slub.c:5271 [inline] kmem_cache_alloc_lru_noprof+0x3fe/0x6e0 mm/slub.c:5302 jfs_alloc_inode+0x28/0x70 fs/jfs/super.c:105 alloc_inode+0x6a/0x1b0 fs/inode.c:346 new_inode+0x22/0x170 fs/inode.c:1175 ialloc+0x4c/0x8f0 fs/jfs/jfs_inode.c:48 jfs_create+0x18d/0xa80 fs/jfs/namei.c:92 lookup_open fs/namei.c:4446 [inline] open_last_lookups fs/namei.c:4546 [inline] path_openat+0x1387/0x3840 fs/namei.c:4790 do_filp_open+0x1fa/0x410 fs/namei.c:4820 do_sys_openat2+0x121/0x200 fs/open.c:1391 page last free pid 6127 tgid 6127 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1436 [inline] __free_frozen_pages+0xb99/0xd10 mm/page_alloc.c:2976 __slab_free+0x2ce/0x320 mm/slub.c:6024 qlink_free mm/kasan/quarantine.c:163 [inline] qlist_free_all+0x97/0x100 mm/kasan/quarantine.c:179 kasan_quarantine_reduce+0x148/0x160 mm/kasan/quarantine.c:286 __kasan_slab_alloc+0x22/0x80 mm/kasan/common.c:350 kasan_slab_alloc include/linux/kasan.h:253 [inline] slab_post_alloc_hook mm/slub.c:4969 [inline] slab_alloc_node mm/slub.c:5283 [inline] kmem_cache_alloc_noprof+0x37d/0x710 mm/slub.c:5290 getname_flags+0xb8/0x540 fs/namei.c:146 do_readlinkat+0xbc/0x500 fs/stat.c:575 __do_sys_readlink fs/stat.c:613 [inline] __se_sys_readlink fs/stat.c:610 [inline] __x64_sys_readlink+0x7f/0x90 fs/stat.c:610 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xec/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f Memory state around the buggy address: ffff888078f84880: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc ffff888078f84900: fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb >ffff888078f84980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888078f84a00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888078f84a80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================