================================================================== BUG: KASAN: use-after-free in cleancache_fs_enabled_mapping include/linux/cleancache.h:56 [inline] BUG: KASAN: use-after-free in cleancache_invalidate_page include/linux/cleancache.h:110 [inline] BUG: KASAN: use-after-free in unaccount_page_cache_page+0x6f1/0x760 mm/filemap.c:172 Read of size 4 at addr ffff888113bbb470 by task syz.6.5346/16528 CPU: 0 PID: 16528 Comm: syz.6.5346 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/25/2026 Call Trace: __dump_stack+0x21/0x30 lib/dump_stack.c:88 dump_stack_lvl+0x110/0x170 lib/dump_stack.c:106 print_address_description+0x7f/0x2c0 mm/kasan/report.c:248 __kasan_report mm/kasan/report.c:427 [inline] kasan_report+0x10f/0x150 mm/kasan/report.c:444 __asan_report_load4_noabort+0x14/0x20 mm/kasan/report_generic.c:308 cleancache_fs_enabled_mapping include/linux/cleancache.h:56 [inline] cleancache_invalidate_page include/linux/cleancache.h:110 [inline] unaccount_page_cache_page+0x6f1/0x760 mm/filemap.c:172 __delete_from_page_cache+0xbe/0x470 mm/filemap.c:240 __remove_mapping+0x601/0x990 mm/vmscan.c:1216 shrink_page_list+0x2a24/0x5800 mm/vmscan.c:1829 shrink_inactive_list mm/vmscan.c:2338 [inline] shrink_list mm/vmscan.c:2583 [inline] shrink_lruvec+0x1297/0x3a40 mm/vmscan.c:5800 shrink_node_memcgs mm/vmscan.c:5992 [inline] shrink_node+0x11ee/0x2a40 mm/vmscan.c:6022 shrink_zones mm/vmscan.c:6228 [inline] do_try_to_free_pages+0x5a7/0x1580 mm/vmscan.c:6286 try_to_free_pages+0x4e6/0xc50 mm/vmscan.c:6521 __perform_reclaim mm/page_alloc.c:4957 [inline] __alloc_pages_direct_reclaim mm/page_alloc.c:4980 [inline] __alloc_pages_slowpath+0x146f/0x3090 mm/page_alloc.c:5440 __alloc_pages+0x338/0x460 mm/page_alloc.c:5837 __alloc_pages_node include/linux/gfp.h:595 [inline] alloc_pages_node include/linux/gfp.h:609 [inline] alloc_pages include/linux/gfp.h:622 [inline] __get_free_pages+0x10/0x30 mm/page_alloc.c:5861 io_mem_alloc io_uring/io_uring.c:8901 [inline] io_allocate_scq_urings io_uring/io_uring.c:10340 [inline] io_uring_create io_uring/io_uring.c:10438 [inline] io_uring_setup io_uring/io_uring.c:10528 [inline] __do_sys_io_uring_setup io_uring/io_uring.c:10534 [inline] __se_sys_io_uring_setup+0x11a0/0x2a20 io_uring/io_uring.c:10531 __x64_sys_io_uring_setup+0x5b/0x70 io_uring/io_uring.c:10531 x64_sys_call+0x5f4/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:426 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 RIP: 0033:0x7f6f2c59fe59 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:00007f6f2aff8fb8 EFLAGS: 00000206 ORIG_RAX: 00000000000001a9 RAX: ffffffffffffffda RBX: 0000200000000140 RCX: 00007f6f2c59fe59 RDX: 0000200000000000 RSI: 0000200000000140 RDI: 000000000000315b RBP: 00007f6f2c635e6f R08: 0000000000000000 R09: 0000000000000000 R10: 0000200000000000 R11: 0000000000000206 R12: 0000200000000000 R13: 0000200000000000 R14: 0000200000000100 R15: 00007fff5c4f41b8 Allocated by task 16321: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track mm/kasan/common.c:45 [inline] set_alloc_info mm/kasan/common.c:433 [inline] ____kasan_kmalloc mm/kasan/common.c:512 [inline] __kasan_kmalloc+0xd4/0x100 mm/kasan/common.c:521 kasan_kmalloc include/linux/kasan.h:227 [inline] __kmalloc_track_caller+0x13c/0x2c0 mm/slub.c:4959 kmalloc_reserve net/core/skbuff.c:357 [inline] __alloc_skb+0x210/0x730 net/core/skbuff.c:428 alloc_skb include/linux/skbuff.h:1183 [inline] nlmsg_new include/net/netlink.h:953 [inline] audit_buffer_alloc kernel/audit.c:1803 [inline] audit_log_start+0x407/0x8a0 kernel/audit.c:1921 audit_seccomp+0x62/0x160 kernel/auditsc.c:2726 seccomp_log kernel/seccomp.c:988 [inline] __seccomp_filter+0xadc/0x1930 kernel/seccomp.c:1254 __secure_computing+0xea/0x290 kernel/seccomp.c:1316 syscall_trace_enter+0xcf/0x180 kernel/entry/common.c:68 __syscall_enter_from_user_work kernel/entry/common.c:96 [inline] syscall_enter_from_user_mode+0x1f/0x30 kernel/entry/common.c:114 do_syscall_64+0x24/0xa0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x66/0xd0 Freed by task 30: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track+0x4a/0x70 mm/kasan/common.c:45 kasan_set_free_info+0x23/0x40 mm/kasan/generic.c:370 ____kasan_slab_free+0x125/0x160 mm/kasan/common.c:365 __kasan_slab_free+0x11/0x20 mm/kasan/common.c:373 kasan_slab_free include/linux/kasan.h:193 [inline] slab_free_hook mm/slub.c:1728 [inline] slab_free_freelist_hook+0xc2/0x190 mm/slub.c:1754 slab_free mm/slub.c:3526 [inline] kfree+0xc4/0x270 mm/slub.c:4588 skb_free_head net/core/skbuff.c:656 [inline] skb_release_data+0x7bd/0xa20 net/core/skbuff.c:678 skb_release_all net/core/skbuff.c:743 [inline] __kfree_skb net/core/skbuff.c:757 [inline] kfree_skb_reason net/core/skbuff.c:778 [inline] kfree_skb+0xb9/0x2f0 net/core/skbuff.c:792 kauditd_hold_skb+0x116/0x210 kernel/audit.c:614 kauditd_send_queue+0x28c/0x2e0 kernel/audit.c:769 kauditd_thread+0x4ea/0x880 kernel/audit.c:893 kthread+0x3f5/0x4f0 kernel/kthread.c:337 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287 Last potentially related work creation: kasan_save_stack+0x3a/0x60 mm/kasan/common.c:38 __kasan_record_aux_stack+0xd2/0x100 mm/kasan/generic.c:348 kasan_record_aux_stack_noalloc+0xb/0x10 mm/kasan/generic.c:358 insert_work+0x51/0x310 kernel/workqueue.c:1373 __queue_work+0x8e1/0xc60 kernel/workqueue.c:1539 queue_work_on+0xde/0x150 kernel/workqueue.c:1566 queue_work include/linux/workqueue.h:510 [inline] schedule_work include/linux/workqueue.h:571 [inline] destroy_super_rcu+0xd1/0xe0 fs/super.c:172 rcu_do_batch+0x4c1/0xbf0 kernel/rcu/tree.c:2523 rcu_core+0x4a3/0xef0 kernel/rcu/tree.c:2763 rcu_core_si+0x9/0x10 kernel/rcu/tree.c:2776 handle_softirqs+0x250/0x560 kernel/softirq.c:583 __do_softirq kernel/softirq.c:621 [inline] invoke_softirq kernel/softirq.c:443 [inline] __irq_exit_rcu+0x52/0xf0 kernel/softirq.c:670 irq_exit_rcu+0x9/0x10 kernel/softirq.c:682 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1108 [inline] sysvec_apic_timer_interrupt+0xa9/0xc0 arch/x86/kernel/apic/apic.c:1108 asm_sysvec_apic_timer_interrupt+0x1b/0x20 arch/x86/include/asm/idtentry.h:676 Second to last potentially related work creation: kasan_save_stack+0x3a/0x60 mm/kasan/common.c:38 __kasan_record_aux_stack+0xd2/0x100 mm/kasan/generic.c:348 kasan_record_aux_stack_noalloc+0xb/0x10 mm/kasan/generic.c:358 __call_rcu_common kernel/rcu/tree.c:3011 [inline] call_rcu+0x10b/0xf60 kernel/rcu/tree.c:3129 __put_super+0x26b/0x2d0 fs/super.c:299 put_super fs/super.c:313 [inline] deactivate_locked_super+0xd4/0x100 fs/super.c:346 mount_bdev+0x2ab/0x3c0 fs/super.c:1402 f2fs_mount+0x34/0x40 fs/f2fs/super.c:4713 legacy_get_tree+0xed/0x190 fs/fs_context.c:611 vfs_get_tree+0x89/0x260 fs/super.c:1530 do_new_mount+0x251/0xb40 fs/namespace.c:3037 path_mount+0x640/0xff0 fs/namespace.c:3367 do_mount fs/namespace.c:3380 [inline] __do_sys_mount fs/namespace.c:3588 [inline] __se_sys_mount+0x320/0x390 fs/namespace.c:3565 __x64_sys_mount+0xbf/0xd0 fs/namespace.c:3565 x64_sys_call+0x6bf/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:166 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 The buggy address belongs to the object at ffff888113bbb000 which belongs to the cache kmalloc-2k of size 2048 The buggy address is located 1136 bytes inside of 2048-byte region [ffff888113bbb000, ffff888113bbb800) The buggy address belongs to the page: page:ffffea00044eee00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x113bb8 head:ffffea00044eee00 order:3 compound_mapcount:0 compound_pincount:0 flags: 0x4000000000010200(slab|head|zone=1) raw: 4000000000010200 dead000000000100 dead000000000122 ffff888100043200 raw: 0000000000000000 0000000000080008 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 3, migratetype Unmovable, gfp_mask 0x1d20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 1856, ts 117636950095, free_ts 116564600846 set_page_owner include/linux/page_owner.h:33 [inline] post_alloc_hook+0x192/0x1b0 mm/page_alloc.c:2607 prep_new_page+0x1c/0x110 mm/page_alloc.c:2613 get_page_from_freelist+0x2c3a/0x2cd0 mm/page_alloc.c:4487 __alloc_pages+0x1a2/0x460 mm/page_alloc.c:5824 alloc_slab_page mm/slub.c:-1 [inline] allocate_slab mm/slub.c:1937 [inline] new_slab+0xa0/0x4d0 mm/slub.c:2000 ___slab_alloc+0x3ac/0x840 mm/slub.c:3033 __slab_alloc+0x49/0x90 mm/slub.c:3120 slab_alloc_node mm/slub.c:3211 [inline] slab_alloc mm/slub.c:3255 [inline] __kmalloc_track_caller+0x169/0x2c0 mm/slub.c:4954 kmemdup+0x26/0x60 mm/util.c:132 neigh_sysctl_register+0xbf/0xa90 net/core/neighbour.c:3652 addrconf_sysctl_register+0xb3/0x1a0 net/ipv6/addrconf.c:7207 ipv6_add_dev+0xc09/0x1150 net/ipv6/addrconf.c:456 addrconf_notify+0x582/0xe00 net/ipv6/addrconf.c:3600 notifier_call_chain kernel/notifier.c:83 [inline] raw_notifier_call_chain+0x90/0x100 kernel/notifier.c:391 call_netdevice_notifiers_info net/core/dev.c:2070 [inline] call_netdevice_notifiers_extack net/core/dev.c:2082 [inline] call_netdevice_notifiers+0x119/0x190 net/core/dev.c:2096 register_netdevice+0x110a/0x1490 net/core/dev.c:10462 page last free stack trace: reset_page_owner include/linux/page_owner.h:26 [inline] free_pages_prepare mm/page_alloc.c:1474 [inline] free_pcp_prepare mm/page_alloc.c:1546 [inline] free_unref_page_prepare+0x5fa/0x600 mm/page_alloc.c:3536 free_unref_page+0xae/0x540 mm/page_alloc.c:3618 free_the_page mm/page_alloc.c:805 [inline] __free_pages+0x6c/0x100 mm/page_alloc.c:5900 __free_slab+0xe5/0x1e0 mm/slub.c:2025 free_slab mm/slub.c:2040 [inline] discard_slab mm/slub.c:2046 [inline] __unfreeze_partials+0x15a/0x190 mm/slub.c:2532 put_cpu_partial+0xc6/0x120 mm/slub.c:2612 __slab_free+0x1d4/0x290 mm/slub.c:3395 do_slab_free mm/slub.c:3514 [inline] ___cache_free+0x104/0x120 mm/slub.c:3535 qlink_free+0x4d/0x90 mm/kasan/quarantine.c:157 qlist_free_all+0x5f/0xb0 mm/kasan/quarantine.c:176 kasan_quarantine_reduce+0x14a/0x170 mm/kasan/quarantine.c:283 __kasan_slab_alloc+0x2f/0xe0 mm/kasan/common.c:443 kasan_slab_alloc include/linux/kasan.h:217 [inline] slab_post_alloc_hook+0x4f/0x2b0 mm/slab.h:550 slab_alloc_node mm/slub.c:3245 [inline] slab_alloc mm/slub.c:3255 [inline] kmem_cache_alloc+0xf7/0x260 mm/slub.c:3260 getname_flags+0xba/0x510 fs/namei.c:138 user_path_at_empty+0x2f/0x1c0 fs/namei.c:2890 Memory state around the buggy address: ffff888113bbb300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888113bbb380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff888113bbb400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888113bbb480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888113bbb500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================