================================================================== BUG: KASAN: slab-use-after-free in rht_key_hashfn include/linux/rhashtable.h:159 [inline] BUG: KASAN: slab-use-after-free in rht_head_hashfn include/linux/rhashtable.h:174 [inline] BUG: KASAN: slab-use-after-free in __rhashtable_remove_fast_one include/linux/rhashtable.h:1007 [inline] BUG: KASAN: slab-use-after-free in __rhashtable_remove_fast include/linux/rhashtable.h:1093 [inline] BUG: KASAN: slab-use-after-free in rhashtable_remove_fast include/linux/rhashtable.h:1122 [inline] BUG: KASAN: slab-use-after-free in xfs_buf_rele_cached fs/xfs/xfs_buf.c:923 [inline] BUG: KASAN: slab-use-after-free in xfs_buf_rele+0x977/0x1030 fs/xfs/xfs_buf.c:948 Read of size 4 at addr ffff88805e631408 by task syz.6.339/10470 CPU: 0 UID: 0 PID: 10470 Comm: syz.6.339 Not tainted syzkaller #0 PREEMPT_{RT,(full)} Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025 Call Trace: 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 rht_key_hashfn include/linux/rhashtable.h:159 [inline] rht_head_hashfn include/linux/rhashtable.h:174 [inline] __rhashtable_remove_fast_one include/linux/rhashtable.h:1007 [inline] __rhashtable_remove_fast include/linux/rhashtable.h:1093 [inline] rhashtable_remove_fast include/linux/rhashtable.h:1122 [inline] xfs_buf_rele_cached fs/xfs/xfs_buf.c:923 [inline] xfs_buf_rele+0x977/0x1030 fs/xfs/xfs_buf.c:948 xfs_buftarg_shrink_scan+0x23e/0x2d0 fs/xfs/xfs_buf.c:1650 do_shrink_slab+0x6ec/0x1110 mm/shrinker.c:437 shrink_slab+0xd74/0x10d0 mm/shrinker.c:664 drop_slab_node mm/vmscan.c:441 [inline] drop_slab+0x14e/0x290 mm/vmscan.c:459 drop_caches_sysctl_handler+0xc7/0x170 fs/drop_caches.c:68 proc_sys_call_handler+0x4c4/0x700 fs/proc/proc_sysctl.c:600 do_iter_readv_writev+0x632/0x8d0 fs/read_write.c:-1 vfs_writev+0x323/0x970 fs/read_write.c:1057 do_writev+0x153/0x2d0 fs/read_write.c:1103 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: 0033:0x7f03ea31eec9 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:00007f03e8586038 EFLAGS: 00000246 ORIG_RAX: 0000000000000014 RAX: ffffffffffffffda RBX: 00007f03ea575fa0 RCX: 00007f03ea31eec9 RDX: 0000000000000001 RSI: 0000200000020f80 RDI: 0000000000000003 RBP: 00007f03ea3a1f91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f03ea576038 R14: 00007f03ea575fa0 R15: 00007ffdcadbd718 Allocated by task 10447: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:68 poison_kmalloc_redzone mm/kasan/common.c:388 [inline] __kasan_kmalloc+0x93/0xb0 mm/kasan/common.c:405 kasan_kmalloc include/linux/kasan.h:260 [inline] __do_kmalloc_node mm/slub.c:4376 [inline] __kvmalloc_node_noprof+0x25b/0x500 mm/slub.c:5067 bucket_table_alloc lib/rhashtable.c:186 [inline] rhashtable_init_noprof+0x501/0xbc0 lib/rhashtable.c:1075 xfs_perag_alloc fs/xfs/libxfs/xfs_ag.c:238 [inline] xfs_initialize_perag+0x284/0x630 fs/xfs/libxfs/xfs_ag.c:279 xfs_mountfs+0xae0/0x22c0 fs/xfs/xfs_mount.c:995 xfs_fs_fill_super+0x1185/0x15d0 fs/xfs/xfs_super.c:1926 get_tree_bdev_flags+0x40e/0x4d0 fs/super.c:1692 vfs_get_tree+0x92/0x2b0 fs/super.c:1752 do_new_mount+0x2a2/0xa30 fs/namespace.c:3750 do_mount fs/namespace.c:4078 [inline] __do_sys_mount fs/namespace.c:4278 [inline] __se_sys_mount+0x317/0x410 fs/namespace.c:4255 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 Freed by task 10264: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:68 kasan_save_free_info+0x46/0x50 mm/kasan/generic.c:576 poison_slab_object mm/kasan/common.c:243 [inline] __kasan_slab_free+0x5b/0x80 mm/kasan/common.c:275 kasan_slab_free include/linux/kasan.h:233 [inline] slab_free_hook mm/slub.c:2422 [inline] slab_free mm/slub.c:4695 [inline] kfree+0x197/0x680 mm/slub.c:4894 rhashtable_free_and_destroy+0x7e8/0x940 lib/rhashtable.c:1173 xfs_group_free+0x163/0x370 fs/xfs/libxfs/xfs_group.c:171 xfs_free_perag_range+0x36/0x60 fs/xfs/libxfs/xfs_ag.c:133 xfs_unmountfs+0x2db/0x320 fs/xfs/xfs_mount.c:1360 xfs_fs_put_super+0x65/0x160 fs/xfs/xfs_super.c:1234 generic_shutdown_super+0x132/0x2c0 fs/super.c:643 kill_block_super+0x44/0x90 fs/super.c:1723 xfs_kill_sb+0x15/0x50 fs/xfs/xfs_super.c:2263 deactivate_locked_super+0xbc/0x130 fs/super.c:474 cleanup_mnt+0x425/0x4c0 fs/namespace.c:1318 task_work_run+0x1d1/0x260 kernel/task_work.c:227 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline] exit_to_user_mode_loop+0xe9/0x110 kernel/entry/common.c:43 exit_to_user_mode_prepare include/linux/irq-entry-common.h:225 [inline] syscall_exit_to_user_mode_work include/linux/entry-common.h:175 [inline] syscall_exit_to_user_mode include/linux/entry-common.h:210 [inline] do_syscall_64+0x2bd/0x3b0 arch/x86/entry/syscall_64.c:100 entry_SYSCALL_64_after_hwframe+0x77/0x7f The buggy address belongs to the object at ffff88805e631400 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 8 bytes inside of freed 512-byte region [ffff88805e631400, ffff88805e631600) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x5e630 head: order:2 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 anon flags: 0x80000000000040(head|node=0|zone=1) page_type: f5(slab) raw: 0080000000000040 ffff888019441c80 0000000000000000 dead000000000001 raw: 0000000000000000 0000000000100010 00000000f5000000 0000000000000000 head: 0080000000000040 ffff888019441c80 0000000000000000 dead000000000001 head: 0000000000000000 0000000000100010 00000000f5000000 0000000000000000 head: 0080000000000002 ffffea0001798c01 00000000ffffffff 00000000ffffffff head: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000004 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 2, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 5811, tgid 5811 (syz-executor), ts 98100630176, free_ts 98080994162 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+0x26dc/0x2770 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:2492 [inline] allocate_slab+0x8a/0x370 mm/slub.c:2660 new_slab mm/slub.c:2714 [inline] ___slab_alloc+0xab4/0x1320 mm/slub.c:3901 __slab_alloc+0xb9/0x180 mm/slub.c:3992 __slab_alloc_node mm/slub.c:4067 [inline] slab_alloc_node mm/slub.c:4228 [inline] __kmalloc_cache_noprof+0xbf/0x2e0 mm/slub.c:4402 kmalloc_noprof include/linux/slab.h:905 [inline] kzalloc_noprof include/linux/slab.h:1039 [inline] devcgroup_css_alloc+0x4e/0x100 security/device_cgroup.c:226 css_create kernel/cgroup/cgroup.c:5798 [inline] cgroup_apply_control_enable+0x3d1/0xab0 kernel/cgroup/cgroup.c:3391 cgroup_mkdir+0xcde/0xf30 kernel/cgroup/cgroup.c:6024 kernfs_iop_mkdir+0x211/0x350 fs/kernfs/dir.c:1268 vfs_mkdir+0x303/0x510 fs/namei.c:4453 do_mkdirat+0x247/0x590 fs/namei.c:4486 __do_sys_mkdirat fs/namei.c:4503 [inline] __se_sys_mkdirat fs/namei.c:4501 [inline] __x64_sys_mkdirat+0x87/0xa0 fs/namei.c:4501 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94 page last free pid 5933 tgid 5932 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1395 [inline] __free_frozen_pages+0xfcf/0x1160 mm/page_alloc.c:2895 stack_depot_save_flags+0x436/0x860 lib/stackdepot.c:727 kasan_save_stack mm/kasan/common.c:48 [inline] kasan_save_track+0x4f/0x80 mm/kasan/common.c:68 unpoison_slab_object mm/kasan/common.c:330 [inline] __kasan_slab_alloc+0x6c/0x80 mm/kasan/common.c:356 kasan_slab_alloc include/linux/kasan.h:250 [inline] slab_post_alloc_hook mm/slub.c:4191 [inline] slab_alloc_node mm/slub.c:4240 [inline] kmem_cache_alloc_lru_noprof+0x11a/0x2d0 mm/slub.c:4259 ocfs2_alloc_inode+0x2a/0xf0 fs/ocfs2/super.c:553 alloc_inode+0x6a/0x1b0 fs/inode.c:346 iget5_locked+0x4a/0xa0 fs/inode.c:1357 ocfs2_iget+0x22c/0x1a90 fs/ocfs2/inode.c:145 _ocfs2_get_system_file_inode fs/ocfs2/sysfile.c:142 [inline] ocfs2_get_system_file_inode+0x37a/0x7d0 fs/ocfs2/sysfile.c:112 ocfs2_init_local_system_inodes fs/ocfs2/super.c:491 [inline] ocfs2_mount_volume fs/ocfs2/super.c:1756 [inline] ocfs2_fill_super+0x39ae/0x65f0 fs/ocfs2/super.c:1083 get_tree_bdev_flags+0x40e/0x4d0 fs/super.c:1692 vfs_get_tree+0x92/0x2b0 fs/super.c:1752 do_new_mount+0x2a2/0xa30 fs/namespace.c:3750 do_mount fs/namespace.c:4078 [inline] __do_sys_mount fs/namespace.c:4278 [inline] __se_sys_mount+0x317/0x410 fs/namespace.c:4255 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94 Memory state around the buggy address: ffff88805e631300: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88805e631380: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff88805e631400: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88805e631480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88805e631500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================