syzbot

==================================================================
BUG: KASAN: slab-use-after-free in __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:132 [inline]
BUG: KASAN: slab-use-after-free in _raw_spin_lock_irqsave+0x40/0x60 kernel/locking/spinlock.c:166
Read of size 1 at addr ffff8880632827b0 by task syz.0.740/12158

CPU: 0 UID: 0 PID: 12158 Comm: syz.0.740 Not tainted syzkaller #0 PREEMPT_{RT,(full)} 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026
Call Trace:
 <TASK>
 dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
 print_address_description+0x55/0x1e0 mm/kasan/report.c:378
 print_report+0x58/0x70 mm/kasan/report.c:482
 kasan_report+0x117/0x150 mm/kasan/report.c:595
 __kasan_check_byte+0x2a/0x40 mm/kasan/common.c:574
 kasan_check_byte include/linux/kasan.h:402 [inline]
 lock_acquire+0x84/0x350 kernel/locking/lockdep.c:5842
 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:132 [inline]
 _raw_spin_lock_irqsave+0x40/0x60 kernel/locking/spinlock.c:166
 rt_mutex_slowunlock+0xbf/0x8b0 kernel/locking/rtmutex.c:1426
 end_dirop fs/namei.c:2952 [inline]
 end_creating include/linux/namei.h:123 [inline]
 end_creating_path fs/namei.c:4990 [inline]
 filename_mknodat+0x464/0x670 fs/namei.c:5184
 __do_sys_mknod fs/namei.c:5207 [inline]
 __se_sys_mknod+0x3a/0x150 fs/namei.c:5204
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x15f/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fcd4a24c819
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fcd3fc41028 EFLAGS: 00000246 ORIG_RAX: 0000000000000085
RAX: ffffffffffffffda RBX: 00007fcd4a4c6270 RCX: 00007fcd4a24c819
RDX: 0000000000000701 RSI: 100000000000600d RDI: 0000200000000080
RBP: 00007fcd4a2e2c91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fcd4a4c6308 R14: 00007fcd4a4c6270 R15: 00007ffc4aeb1dc8
 </TASK>

Allocated by task 12158:
 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:4569 [inline]
 slab_alloc_node mm/slub.c:4898 [inline]
 kmem_cache_alloc_lru_noprof+0x33c/0x680 mm/slub.c:4917
 __d_alloc+0x37/0x6f0 fs/dcache.c:1740
 d_alloc+0x4b/0x190 fs/dcache.c:1819
 lookup_one_qstr_excl+0xd8/0x360 fs/namei.c:1801
 __start_dirop fs/namei.c:2916 [inline]
 start_dirop fs/namei.c:2938 [inline]
 filename_create+0x20e/0x370 fs/namei.c:4950
 filename_mknodat+0x18c/0x670 fs/namei.c:5158
 __do_sys_mknod fs/namei.c:5207 [inline]
 __se_sys_mknod+0x3a/0x150 fs/namei.c:5204
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x15f/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Freed by task 20:
 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:2689 [inline]
 slab_free mm/slub.c:6246 [inline]
 kmem_cache_free+0x187/0x6c0 mm/slub.c:6373
 rcu_do_batch kernel/rcu/tree.c:2617 [inline]
 rcu_core kernel/rcu/tree.c:2869 [inline]
 rcu_cpu_kthread+0x99e/0x1470 kernel/rcu/tree.c:2957
 smpboot_thread_fn+0x541/0xa50 kernel/smpboot.c:160
 kthread+0x388/0x470 kernel/kthread.c:436
 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

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
 __dentry_kill+0x469/0x5e0 fs/dcache.c:689
 finish_dput+0xc9/0x480 fs/dcache.c:879
 ocfs2_dentry_attach_lock+0x72c/0xd50 fs/ocfs2/dcache.c:328
 ocfs2_lookup+0x3fc/0xa20 fs/ocfs2/namei.c:163
 lookup_open fs/namei.c:4484 [inline]
 open_last_lookups fs/namei.c:4611 [inline]
 path_openat+0x11cb/0x38a0 fs/namei.c:4855
 do_file_open+0x23e/0x4a0 fs/namei.c:4887
 do_sys_openat2+0x113/0x200 fs/open.c:1364
 do_sys_open fs/open.c:1370 [inline]
 __do_sys_creat fs/open.c:1448 [inline]
 __se_sys_creat fs/open.c:1442 [inline]
 __x64_sys_creat+0x8f/0xc0 fs/open.c:1442
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x15f/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

The buggy address belongs to the object at ffff8880632826e0
 which belongs to the cache dentry of size 376
The buggy address is located 208 bytes inside of
 freed 376-byte region [ffff8880632826e0, ffff888063282858)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x63282
head: order:1 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
memcg:ffff888063283ef1
flags: 0x80000000000040(head|node=0|zone=1)
page_type: f5(slab)
raw: 0080000000000040 ffff88801b6c33c0 dead000000000100 dead000000000122
raw: 0000000000000000 0000000800120012 00000000f5000000 ffff888063283ef1
head: 0080000000000040 ffff88801b6c33c0 dead000000000100 dead000000000122
head: 0000000000000000 0000000800120012 00000000f5000000 ffff888063283ef1
head: 0080000000000001 ffffffffffffff81 00000000ffffffff 00000000ffffffff
head: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000002
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 1, migratetype Reclaimable, gfp_mask 0xd20d0(__GFP_RECLAIMABLE|__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 5183, tgid 5183 (udevd), ts 108377682153, free_ts 0
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0x231/0x280 mm/page_alloc.c:1858
 prep_new_page mm/page_alloc.c:1866 [inline]
 get_page_from_freelist+0x27c8/0x2840 mm/page_alloc.c:3946
 __alloc_frozen_pages_noprof+0x18d/0x380 mm/page_alloc.c:5226
 alloc_slab_page mm/slub.c:3278 [inline]
 allocate_slab+0x77/0x660 mm/slub.c:3467
 new_slab mm/slub.c:3525 [inline]
 refill_objects+0x33c/0x3d0 mm/slub.c:7251
 refill_sheaf mm/slub.c:2816 [inline]
 __pcs_replace_empty_main+0x373/0x720 mm/slub.c:4651
 alloc_from_pcs mm/slub.c:4749 [inline]
 slab_alloc_node mm/slub.c:4883 [inline]
 kmem_cache_alloc_lru_noprof+0x433/0x680 mm/slub.c:4917
 __d_alloc+0x37/0x6f0 fs/dcache.c:1740
 d_alloc+0x4b/0x190 fs/dcache.c:1819
 lookup_one_qstr_excl+0xd8/0x360 fs/namei.c:1801
 __start_dirop fs/namei.c:2916 [inline]
 start_dirop fs/namei.c:2938 [inline]
 filename_unlinkat+0x2c0/0x610 fs/namei.c:5549
 __do_sys_unlink fs/namei.c:5603 [inline]
 __se_sys_unlink+0x2e/0x140 fs/namei.c:5600
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x15f/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
page_owner free stack trace missing

Memory state around the buggy address:
 ffff888063282680: fb fb fb fb fc fc fc fc fc fc fc fc fa fb fb fb
 ffff888063282700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff888063282780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                     ^
 ffff888063282800: fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc fc
 ffff888063282880: fc fc fc 00 00 00 00 00 00 00 00 00 00 00 00 00
==================================================================