syzbot

BUG: spinlock bad magic on CPU#0, jfsCommit/113
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BUG: KASAN: slab-out-of-bounds in string_nocheck lib/vsprintf.c:645 [inline]
BUG: KASAN: slab-out-of-bounds in string+0x223/0x2b0 lib/vsprintf.c:727
Read of size 1 at addr ffff88805e9a12a8 by task jfsCommit/113

CPU: 0 PID: 113 Comm: jfsCommit Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
Call Trace:
 <TASK>
 dump_stack_lvl+0x18c/0x250 lib/dump_stack.c:106
 print_address_description mm/kasan/report.c:364 [inline]
 print_report+0xa8/0x210 mm/kasan/report.c:468
 kasan_report+0x117/0x150 mm/kasan/report.c:581
 string_nocheck lib/vsprintf.c:645 [inline]
 string+0x223/0x2b0 lib/vsprintf.c:727
 vsnprintf+0xf72/0x1ba0 lib/vsprintf.c:2823
 vprintk_store+0x3ec/0xda0 kernel/printk/printk.c:2226
 vprintk_emit+0x117/0x610 kernel/printk/printk.c:2322
 _printk+0xde/0x130 kernel/printk/printk.c:2366
 spin_dump+0x101/0x1a0 kernel/locking/spinlock_debug.c:63
 spin_bug kernel/locking/spinlock_debug.c:77 [inline]
 debug_spin_lock_before kernel/locking/spinlock_debug.c:85 [inline]
 do_raw_spin_lock+0x1bf/0x2c0 kernel/locking/spinlock_debug.c:114
 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:111 [inline]
 _raw_spin_lock_irqsave+0xc0/0x100 kernel/locking/spinlock.c:162
 __wake_up_common_lock kernel/sched/wait.c:137 [inline]
 __wake_up+0x10b/0x1a0 kernel/sched/wait.c:160
 unlock_metapage fs/jfs/jfs_metapage.c:38 [inline]
 release_metapage+0xc5/0x870 fs/jfs/jfs_metapage.c:765
 xtTruncate+0xebe/0x2ec0 fs/jfs/jfs_xtree.c:-1
 jfs_free_zero_link+0x35c/0x4c0 fs/jfs/namei.c:758
 jfs_evict_inode+0x35d/0x440 fs/jfs/inode.c:159
 evict+0x4ca/0x8d0 fs/inode.c:705
 txLazyCommit fs/jfs/jfs_txnmgr.c:2665 [inline]
 jfs_lazycommit+0x429/0xa70 fs/jfs/jfs_txnmgr.c:2733
 kthread+0x2fa/0x390 kernel/kthread.c:388
 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293
 </TASK>

The buggy address belongs to the object at ffff88805e9a1280
 which belongs to the cache jfs_ip of size 2240
The buggy address is located 40 bytes inside of
 allocated 2240-byte region [ffff88805e9a1280, ffff88805e9a1b40)

The buggy address belongs to the physical page:
page:ffffea00017a6800 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x5e9a0
head:ffffea00017a6800 order:3 entire_mapcount:0 nr_pages_mapped:0 pincount:0
memcg:ffff888076bdf901
flags: 0xfff00000000840(slab|head|node=0|zone=1|lastcpupid=0x7ff)
page_type: 0xffffffff()
raw: 00fff00000000840 ffff8881436ddc80 dead000000000122 0000000000000000
raw: 0000000000000000 00000000800d000d 00000001ffffffff ffff888076bdf901
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 3, migratetype Reclaimable, gfp_mask 0x1d2050(__GFP_IO|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL|__GFP_RECLAIMABLE), pid 5931, tgid 5931 (syz.0.17), ts 90617312086, free_ts 24316853060
 set_page_owner include/linux/page_owner.h:31 [inline]
 post_alloc_hook+0x1c1/0x200 mm/page_alloc.c:1581
 prep_new_page mm/page_alloc.c:1588 [inline]
 get_page_from_freelist+0x1951/0x19e0 mm/page_alloc.c:3220
 __alloc_pages+0x1f0/0x460 mm/page_alloc.c:4500
 alloc_slab_page+0x5d/0x160 mm/slub.c:1881
 allocate_slab mm/slub.c:2028 [inline]
 new_slab+0x87/0x2d0 mm/slub.c:2081
 ___slab_alloc+0xc5d/0x12f0 mm/slub.c:3253
 __slab_alloc mm/slub.c:3339 [inline]
 __slab_alloc_node mm/slub.c:3392 [inline]
 slab_alloc_node mm/slub.c:3485 [inline]
 slab_alloc mm/slub.c:3503 [inline]
 __kmem_cache_alloc_lru mm/slub.c:3510 [inline]
 kmem_cache_alloc_lru+0x1aa/0x2d0 mm/slub.c:3526
 alloc_inode_sb include/linux/fs.h:2946 [inline]
 jfs_alloc_inode+0x28/0x60 fs/jfs/super.c:105
 alloc_inode fs/inode.c:261 [inline]
 iget_locked+0x1ad/0x840 fs/inode.c:1359
 jfs_iget+0x24/0x440 fs/jfs/inode.c:29
 jfs_lookup+0x221/0x420 fs/jfs/namei.c:1469
 lookup_one_qstr_excl+0x112/0x250 fs/namei.c:1617
 do_renameat2+0x44e/0xce0 fs/namei.c:4974
 __do_sys_rename fs/namei.c:5079 [inline]
 __se_sys_rename fs/namei.c:5077 [inline]
 __x64_sys_rename+0x86/0x90 fs/namei.c:5077
 do_syscall_x64 arch/x86/entry/common.c:46 [inline]
 do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:24 [inline]
 free_pages_prepare mm/page_alloc.c:1181 [inline]
 free_unref_page_prepare+0x7b2/0x8c0 mm/page_alloc.c:2365
 free_unref_page+0x32/0x2e0 mm/page_alloc.c:2458
 free_contig_range+0xa1/0x150 mm/page_alloc.c:6420
 destroy_args+0x80/0x850 mm/debug_vm_pgtable.c:1015
 debug_vm_pgtable+0x411/0x440 mm/debug_vm_pgtable.c:1400
 do_one_initcall+0x242/0x790 init/main.c:1249
 do_initcall_level+0x137/0x1f0 init/main.c:1311
 do_initcalls+0x69/0xd0 init/main.c:1327
 kernel_init_freeable+0x3ed/0x580 init/main.c:1564
 kernel_init+0x1d/0x1c0 init/main.c:1454
 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293

Memory state around the buggy address:
 ffff88805e9a1180: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff88805e9a1200: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff88805e9a1280: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
                                  ^
 ffff88805e9a1300: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff88805e9a1380: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
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