ocfs2: Mounting device (7,2) on (node local, slot 0) with ordered data mode.
==================================================================
BUG: KASAN: slab-out-of-bounds in ocfs2_find_smallest_chain fs/ocfs2/suballoc.c:413 [inline]
BUG: KASAN: slab-out-of-bounds in ocfs2_block_group_alloc_contig fs/ocfs2/suballoc.c:430 [inline]
BUG: KASAN: slab-out-of-bounds in ocfs2_block_group_alloc fs/ocfs2/suballoc.c:699 [inline]
BUG: KASAN: slab-out-of-bounds in ocfs2_reserve_suballoc_bits+0xd90/0x4640 fs/ocfs2/suballoc.c:834
Read of size 4 at addr ffff8880261c2074 by task syz.2.18/7134

CPU: 0 UID: 0 PID: 7134 Comm: syz.2.[  185.321818][ T7134] CPU: 0 UID: 0 PID: 7134 Comm: syz.2.18 Tainted: G        W           6.16.0-syzkaller-11241-g186f3edfdd41 #0 PREEMPT_{RT,(full)} 
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
Call Trace:
 <TASK>
 dump_stack_lvl+0x189/0x250 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
 ocfs2_find_smallest_chain fs/ocfs2/suballoc.c:413 [inline]
 ocfs2_block_group_alloc_contig fs/ocfs2/suballoc.c:430 [inline]
 ocfs2_block_group_alloc fs/ocfs2/suballoc.c:699 [inline]
 ocfs2_reserve_suballoc_bits+0xd90/0x4640 fs/ocfs2/suballoc.c:834
 ocfs2_reserve_new_metadata_blocks+0x403/0x940 fs/ocfs2/suballoc.c:984
 ocfs2_mknod+0xe08/0x2050 fs/ocfs2/namei.c:347
 ocfs2_create+0x1a5/0x440 fs/ocfs2/namei.c:673
 lookup_open fs/namei.c:3708 [inline]
 open_last_lookups fs/namei.c:3807 [inline]
 path_openat+0x1500/0x3840 fs/namei.c:4043
 do_filp_open+0x1fa/0x410 fs/namei.c:4073
 do_sys_openat2+0x121/0x1c0 fs/open.c:1435
 do_sys_open fs/open.c:1450 [inline]
 __do_sys_openat fs/open.c:1466 [inline]
 __se_sys_openat fs/open.c:1461 [inline]
 __x64_sys_openat+0x138/0x170 fs/open.c:1461
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f86e2b1cde9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f86e1d86038 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007f86e2d35fa0 RCX: 00007f86e2b1cde9
RDX: 0000000000000042 RSI: 00004000000002c0 RDI: ffffffffffffff9c
RBP: 00007f86e2b9e2a0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f86e2d35fa0 R15: 00007fff67c55e48
 </TASK>

Allocated by task 5217:
 kasan_save_stack mm/kasan/common.c:47 [inline]
 kasan_save_track+0x3e/0x80 mm/kasan/common.c:68
 unpoison_slab_object mm/kasan/common.c:319 [inline]
 __kasan_slab_alloc+0x6c/0x80 mm/kasan/common.c:345
 kasan_slab_alloc include/linux/kasan.h:250 [inline]
 slab_post_alloc_hook mm/slub.c:4180 [inline]
 slab_alloc_node mm/slub.c:4229 [inline]
 kmem_cache_alloc_noprof+0x143/0x310 mm/slub.c:4236
 lsm_inode_alloc security/security.c:755 [inline]
 security_inode_alloc+0x39/0x330 security/security.c:1697
 inode_init_always_gfp+0x9bf/0xd70 fs/inode.c:306
 inode_init_always include/linux/fs.h:3308 [inline]
 alloc_inode+0x82/0x1b0 fs/inode.c:353
 iget_locked+0xf0/0x570 fs/inode.c:1438
 kernfs_get_inode+0x4f/0x780 fs/kernfs/inode.c:253
 kernfs_iop_lookup+0x1f6/0x320 fs/kernfs/dir.c:1236
 __lookup_slow+0x29d/0x3d0 fs/namei.c:1808
 lookup_slow+0x53/0x70 fs/namei.c:1825
 walk_component+0x2d2/0x400 fs/namei.c:2129
 lookup_last fs/namei.c:2630 [inline]
 path_lookupat+0x163/0x430 fs/namei.c:2654
 filename_lookup+0x212/0x570 fs/namei.c:2683
 vfs_statx+0xf8/0x550 fs/stat.c:353
 vfs_fstatat+0x118/0x170 fs/stat.c:375
 __do_sys_newfstatat fs/stat.c:542 [inline]
 __se_sys_newfstatat fs/stat.c:536 [inline]
 __x64_sys_newfstatat+0x116/0x190 fs/stat.c:536
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

The buggy address belongs to the object at ffff8880261c2000
 which belongs to the cache lsm_inode_cache of size 112
The buggy address is located 4 bytes to the right of
 allocated 112-byte region [ffff8880261c2000, ffff8880261c2070)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x261c2
flags: 0x80000000000000(node=0|zone=1)
page_type: f5(slab)
raw: 0080000000000000 ffff88801aed0280 dead000000000122 0000000000000000
raw: 0000000000000000 0000000000170017 00000000f5000000 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Unmovable, gfp_mask 0x52c40(GFP_NOFS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP), pid 5217, tgid 5217 (udevadm), ts 29912829183, free_ts 29903371369
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0x240/0x2a0 mm/page_alloc.c:1851
 prep_new_page mm/page_alloc.c:1859 [inline]
 get_page_from_freelist+0x2119/0x21b0 mm/page_alloc.c:3858
 __alloc_frozen_pages_noprof+0x181/0x370 mm/page_alloc.c:5148
 alloc_pages_mpol+0xd1/0x380 mm/mempolicy.c:2416
 alloc_slab_page mm/slub.c:2487 [inline]
 allocate_slab+0x8a/0x370 mm/slub.c:2655
 new_slab mm/slub.c:2709 [inline]
 ___slab_alloc+0x8d1/0xdd0 mm/slub.c:3891
 __slab_alloc mm/slub.c:3981 [inline]
 __slab_alloc_node mm/slub.c:4056 [inline]
 slab_alloc_node mm/slub.c:4217 [inline]
 kmem_cache_alloc_noprof+0xe6/0x310 mm/slub.c:4236
 lsm_inode_alloc security/security.c:755 [inline]
 security_inode_alloc+0x39/0x330 security/security.c:1697
 inode_init_always_gfp+0x9bf/0xd70 fs/inode.c:306
 inode_init_always include/linux/fs.h:3308 [inline]
 alloc_inode+0x82/0x1b0 fs/inode.c:353
 iget_locked+0xf0/0x570 fs/inode.c:1438
 kernfs_get_inode+0x4f/0x780 fs/kernfs/inode.c:253
 kernfs_iop_lookup+0x1f6/0x320 fs/kernfs/dir.c:1236
 __lookup_slow+0x29d/0x3d0 fs/namei.c:1808
 lookup_slow+0x53/0x70 fs/namei.c:1825
 walk_component+0x2d2/0x400 fs/namei.c:2129
page last free pid 28 tgid 28 stack trace:
 reset_page_owner include/linux/page_owner.h:25 [inline]
 free_pages_prepare mm/page_alloc.c:1395 [inline]
 __free_frozen_pages+0xb59/0xce0 mm/page_alloc.c:2895
 rcu_do_batch kernel/rcu/tree.c:2605 [inline]
 rcu_core kernel/rcu/tree.c:2861 [inline]
 rcu_cpu_kthread+0xbf3/0x1b50 kernel/rcu/tree.c:2949
 smpboot_thread_fn+0x53f/0xa60 kernel/smpboot.c:160
 kthread+0x70e/0x8a0 kernel/kthread.c:464
 ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

Memory state around the buggy address:
 ffff8880261c1f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff8880261c1f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff8880261c2000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 fc fc
                                                             ^
 ffff8880261c2080: fc fc fc fc fc fc 00 00 00 00 00 00 00 00 00 00
 ffff8880261c2100: 00 00 00 00 fc fc fc fc fc fc fc fc 00 00 00 00
==================================================================