================================================================== 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:1053 [inline] BUG: KASAN: slab-use-after-free in __rhashtable_remove_fast include/linux/rhashtable.h:1139 [inline] BUG: KASAN: slab-use-after-free in rhashtable_remove_fast include/linux/rhashtable.h:1168 [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+0x7b4/0xd20 fs/xfs/xfs_buf.c:948 Read of size 4 at addr ffff0000c95ab808 by task syz.0.467/8094 CPU: 0 UID: 0 PID: 8094 Comm: syz.0.467 Not tainted syzkaller #0 PREEMPT Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/03/2025 Call trace: show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:499 (C) __dump_stack+0x30/0x40 lib/dump_stack.c:94 dump_stack_lvl+0xd8/0x12c lib/dump_stack.c:120 print_address_description+0xa8/0x238 mm/kasan/report.c:378 print_report+0x68/0x84 mm/kasan/report.c:482 kasan_report+0xb0/0x110 mm/kasan/report.c:595 __asan_report_load4_noabort+0x20/0x2c mm/kasan/report_generic.c:380 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:1053 [inline] __rhashtable_remove_fast include/linux/rhashtable.h:1139 [inline] rhashtable_remove_fast include/linux/rhashtable.h:1168 [inline] xfs_buf_rele_cached fs/xfs/xfs_buf.c:923 [inline] xfs_buf_rele+0x7b4/0xd20 fs/xfs/xfs_buf.c:948 xfs_buftarg_shrink_scan+0x1d8/0x270 fs/xfs/xfs_buf.c:1650 do_shrink_slab+0x638/0x11b0 mm/shrinker.c:437 shrink_slab+0xc68/0xfb8 mm/shrinker.c:664 drop_slab_node mm/vmscan.c:434 [inline] drop_slab+0x120/0x248 mm/vmscan.c:452 drop_caches_sysctl_handler+0x170/0x300 fs/drop_caches.c:68 proc_sys_call_handler+0x464/0x7ec fs/proc/proc_sysctl.c:600 proc_sys_write+0x2c/0x3c fs/proc/proc_sysctl.c:626 iter_file_splice_write+0x770/0xd7c fs/splice.c:738 do_splice_from fs/splice.c:938 [inline] direct_splice_actor+0xec/0x14c fs/splice.c:1161 splice_direct_to_actor+0x414/0x994 fs/splice.c:1105 do_splice_direct_actor fs/splice.c:1204 [inline] do_splice_direct+0x130/0x210 fs/splice.c:1230 do_sendfile+0x3cc/0x658 fs/read_write.c:1370 __do_sys_sendfile64 fs/read_write.c:1425 [inline] __se_sys_sendfile64 fs/read_write.c:1417 [inline] __arm64_sys_sendfile64+0x128/0x274 fs/read_write.c:1417 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x254 arch/arm64/kernel/syscall.c:49 el0_svc_common+0xe8/0x23c arch/arm64/kernel/syscall.c:132 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151 el0_svc+0x5c/0x26c arch/arm64/kernel/entry-common.c:724 el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:743 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596 Allocated by task 8023: kasan_save_stack mm/kasan/common.c:57 [inline] kasan_save_track+0x40/0x78 mm/kasan/common.c:78 kasan_save_alloc_info+0x44/0x54 mm/kasan/generic.c:570 poison_kmalloc_redzone mm/kasan/common.c:398 [inline] __kasan_kmalloc+0x9c/0xb4 mm/kasan/common.c:415 kasan_kmalloc include/linux/kasan.h:263 [inline] __do_kmalloc_node mm/slub.c:5657 [inline] __kvmalloc_node_noprof+0x574/0x8d8 mm/slub.c:7136 bucket_table_alloc lib/rhashtable.c:186 [inline] rhashtable_init_noprof+0x3b8/0xa18 lib/rhashtable.c:1075 xfs_buf_cache_init+0x28/0x38 fs/xfs/xfs_buf.c:375 xfs_perag_alloc fs/xfs/libxfs/xfs_ag.c:238 [inline] xfs_initialize_perag+0x208/0x5ac fs/xfs/libxfs/xfs_ag.c:279 xfs_mountfs+0x81c/0x1bac fs/xfs/xfs_mount.c:995 xfs_fs_fill_super+0xeac/0x1228 fs/xfs/xfs_super.c:1960 get_tree_bdev_flags+0x360/0x414 fs/super.c:1691 get_tree_bdev+0x2c/0x3c fs/super.c:1714 xfs_fs_get_tree+0x28/0x38 fs/xfs/xfs_super.c:2007 vfs_get_tree+0x90/0x28c fs/super.c:1751 fc_mount fs/namespace.c:1199 [inline] do_new_mount_fc fs/namespace.c:3636 [inline] do_new_mount+0x284/0x944 fs/namespace.c:3712 path_mount+0x5b4/0xdfc fs/namespace.c:4022 do_mount fs/namespace.c:4035 [inline] __do_sys_mount fs/namespace.c:4224 [inline] __se_sys_mount fs/namespace.c:4201 [inline] __arm64_sys_mount+0x3e8/0x468 fs/namespace.c:4201 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x254 arch/arm64/kernel/syscall.c:49 el0_svc_common+0xe8/0x23c arch/arm64/kernel/syscall.c:132 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151 el0_svc+0x5c/0x26c arch/arm64/kernel/entry-common.c:724 el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:743 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596 Freed by task 6569: kasan_save_stack mm/kasan/common.c:57 [inline] kasan_save_track+0x40/0x78 mm/kasan/common.c:78 kasan_save_free_info+0x58/0x70 mm/kasan/generic.c:584 poison_slab_object mm/kasan/common.c:253 [inline] __kasan_slab_free+0x74/0xa4 mm/kasan/common.c:285 kasan_slab_free include/linux/kasan.h:235 [inline] slab_free_hook mm/slub.c:2540 [inline] slab_free mm/slub.c:6670 [inline] kfree+0x1c4/0x5fc mm/slub.c:6878 kvfree+0x30/0x40 mm/slub.c:7185 bucket_table_free+0xec/0x1a4 lib/rhashtable.c:114 rhashtable_free_and_destroy+0x70c/0x87c lib/rhashtable.c:1173 rhashtable_destroy+0x28/0x38 lib/rhashtable.c:1184 xfs_buf_cache_destroy+0x20/0x30 fs/xfs/xfs_buf.c:382 xfs_perag_uninit+0x28/0x38 fs/xfs/libxfs/xfs_ag.c:116 xfs_group_free+0x144/0x32c fs/xfs/libxfs/xfs_group.c:171 xfs_free_perag_range+0x58/0x8c fs/xfs/libxfs/xfs_ag.c:133 xfs_unmountfs+0x29c/0x310 fs/xfs/xfs_mount.c:1360 xfs_fs_put_super+0x6c/0x144 fs/xfs/xfs_super.c:1254 generic_shutdown_super+0x12c/0x2b8 fs/super.c:643 kill_block_super+0x44/0x90 fs/super.c:1722 xfs_kill_sb+0x20/0x58 fs/xfs/xfs_super.c:2297 deactivate_locked_super+0xc4/0x12c fs/super.c:474 deactivate_super+0xe0/0x100 fs/super.c:507 cleanup_mnt+0x31c/0x3ac fs/namespace.c:1318 __cleanup_mnt+0x20/0x30 fs/namespace.c:1325 task_work_run+0x1dc/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+0x10c/0x18c kernel/entry/common.c:75 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:226 [inline] exit_to_user_mode_prepare_legacy include/linux/irq-entry-common.h:242 [inline] arm64_exit_to_user_mode arch/arm64/kernel/entry-common.c:81 [inline] el0_svc+0x17c/0x26c arch/arm64/kernel/entry-common.c:725 el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:743 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596 The buggy address belongs to the object at ffff0000c95ab800 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 8 bytes inside of freed 512-byte region [ffff0000c95ab800, ffff0000c95aba00) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1095a8 head: order:2 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 anon flags: 0x5ffc00000000040(head|node=0|zone=2|lastcpupid=0x7ff) page_type: f5(slab) raw: 05ffc00000000040 ffff0000c0001c80 0000000000000000 dead000000000001 raw: 0000000000000000 0000000000100010 00000000f5000000 0000000000000000 head: 05ffc00000000040 ffff0000c0001c80 0000000000000000 dead000000000001 head: 0000000000000000 0000000000100010 00000000f5000000 0000000000000000 head: 05ffc00000000002 fffffdffc3256a01 00000000ffffffff 00000000ffffffff head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000004 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff0000c95ab700: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff0000c95ab780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff0000c95ab800: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff0000c95ab880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff0000c95ab900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== Unable to handle kernel paging request at virtual address 001e9f1f1f1f1f1f Mem abort info: ESR = 0x0000000096000004 EC = 0x25: DABT (current EL), IL = 32 bits SET = 0, FnV = 0 EA = 0, S1PTW = 0 FSC = 0x04: level 0 translation fault Data abort info: ISV = 0, ISS = 0x00000004, ISS2 = 0x00000000 CM = 0, WnR = 0, TnD = 0, TagAccess = 0 GCS = 0, Overlay = 0, DirtyBit = 0, Xs = 0 [001e9f1f1f1f1f1f] address between user and kernel address ranges Internal error: Oops: 0000000096000004 [#1] SMP Modules linked in: CPU: 0 UID: 0 PID: 8094 Comm: syz.0.467 Tainted: G B syzkaller #0 PREEMPT Tainted: [B]=BAD_PAGE Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/03/2025 pstate: 634000c5 (nZCv daIF +PAN -UAO +TCO +DIT -SSBS BTYPE=--) pc : __rhashtable_remove_fast_one include/linux/rhashtable.h:1060 [inline] pc : __rhashtable_remove_fast include/linux/rhashtable.h:1139 [inline] pc : rhashtable_remove_fast include/linux/rhashtable.h:1168 [inline] pc : xfs_buf_rele_cached fs/xfs/xfs_buf.c:923 [inline] pc : xfs_buf_rele+0x578/0xd20 fs/xfs/xfs_buf.c:948 lr : __rhashtable_remove_fast_one include/linux/rhashtable.h:1060 [inline] lr : __rhashtable_remove_fast include/linux/rhashtable.h:1139 [inline] lr : rhashtable_remove_fast include/linux/rhashtable.h:1168 [inline] lr : xfs_buf_rele_cached fs/xfs/xfs_buf.c:923 [inline] lr : xfs_buf_rele+0x574/0xd20 fs/xfs/xfs_buf.c:948 sp : ffff80009dfb70b0 x29: ffff80009dfb70e0 x28: ffff0000f5185930 x27: 000000000577b416 x26: 0000000000000000 x25: f8f8f8f8f8f8f8f8 x24: dfff800000000000 x23: ffff0000c95ab800 x22: ffff0000f472ea08 x21: 0000000000000000 x20: ffff800092e85000 x19: ffff0000f472ea00 x18: 1fffe0003377d090 x17: 3d3d3d3d3d3d3d3d x16: ffff80008af99304 x15: ffff60001ea30b26 x14: 1fffe0001ea30b26 x13: 00000000000000ff x12: ffffffffffffffff x11: 0000000000080000 x10: 000000000007ffff x9 : ffff8000a48ea000 x8 : 1f1f1f1f1f1f1f1f x7 : 0000000000000001 x6 : ffff800081ea5794 x5 : 0000000000000000 x4 : 0000000000000001 x3 : ffff800081e9f86c x2 : 0000000000000000 x1 : 0000000000000000 x0 : 0000000000000000 Call trace: __rhashtable_remove_fast_one include/linux/rhashtable.h:1060 [inline] (P) __rhashtable_remove_fast include/linux/rhashtable.h:1139 [inline] (P) rhashtable_remove_fast include/linux/rhashtable.h:1168 [inline] (P) xfs_buf_rele_cached fs/xfs/xfs_buf.c:923 [inline] (P) xfs_buf_rele+0x578/0xd20 fs/xfs/xfs_buf.c:948 (P) xfs_buftarg_shrink_scan+0x1d8/0x270 fs/xfs/xfs_buf.c:1650 do_shrink_slab+0x638/0x11b0 mm/shrinker.c:437 shrink_slab+0xc68/0xfb8 mm/shrinker.c:664 drop_slab_node mm/vmscan.c:434 [inline] drop_slab+0x120/0x248 mm/vmscan.c:452 drop_caches_sysctl_handler+0x170/0x300 fs/drop_caches.c:68 proc_sys_call_handler+0x464/0x7ec fs/proc/proc_sysctl.c:600 proc_sys_write+0x2c/0x3c fs/proc/proc_sysctl.c:626 iter_file_splice_write+0x770/0xd7c fs/splice.c:738 do_splice_from fs/splice.c:938 [inline] direct_splice_actor+0xec/0x14c fs/splice.c:1161 splice_direct_to_actor+0x414/0x994 fs/splice.c:1105 do_splice_direct_actor fs/splice.c:1204 [inline] do_splice_direct+0x130/0x210 fs/splice.c:1230 do_sendfile+0x3cc/0x658 fs/read_write.c:1370 __do_sys_sendfile64 fs/read_write.c:1425 [inline] __se_sys_sendfile64 fs/read_write.c:1417 [inline] __arm64_sys_sendfile64+0x128/0x274 fs/read_write.c:1417 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x254 arch/arm64/kernel/syscall.c:49 el0_svc_common+0xe8/0x23c arch/arm64/kernel/syscall.c:132 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151 el0_svc+0x5c/0x26c arch/arm64/kernel/entry-common.c:724 el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:743 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596 Code: 97a2bc8a 14000002 97a2bc88 d343ff28 (38786908) ---[ end trace 0000000000000000 ]--- ---------------- Code disassembly (best guess): 0: 97a2bc8a bl 0xfffffffffe8af228 4: 14000002 b 0xc 8: 97a2bc88 bl 0xfffffffffe8af228 c: d343ff28 lsr x8, x25, #3 * 10: 38786908 ldrb w8, [x8, x24] <-- trapping instruction