================================================================== 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+0x99f/0xa80 mm/filemap.c:175 Read of size 4 at addr ffff888105db5470 by task syz.5.1453/6355 CPU: 1 PID: 6355 Comm: syz.5.1453 Tainted: G W 5.10.236-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack_lvl+0x1e2/0x24b lib/dump_stack.c:118 print_address_description+0x81/0x3b0 mm/kasan/report.c:248 __kasan_report mm/kasan/report.c:435 [inline] kasan_report+0x179/0x1c0 mm/kasan/report.c:452 __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+0x99f/0xa80 mm/filemap.c:175 __delete_from_page_cache+0xd0/0x5d0 mm/filemap.c:243 __remove_mapping+0x567/0x690 mm/vmscan.c:985 shrink_page_list+0x1f38/0x4c60 mm/vmscan.c:1498 shrink_inactive_list+0x591/0x1150 mm/vmscan.c:2075 shrink_list mm/vmscan.c:2294 [inline] shrink_lruvec+0xced/0x3860 mm/vmscan.c:5473 shrink_node_memcgs mm/vmscan.c:5660 [inline] shrink_node+0xded/0x2000 mm/vmscan.c:5690 shrink_zones mm/vmscan.c:5896 [inline] do_try_to_free_pages+0x652/0x1630 mm/vmscan.c:5954 try_to_free_mem_cgroup_pages+0x369/0x830 mm/vmscan.c:6272 try_charge+0x4b8/0x15f0 mm/memcontrol.c:2747 __mem_cgroup_charge+0x147/0x6e0 mm/memcontrol.c:6873 mem_cgroup_charge include/linux/memcontrol.h:458 [inline] shmem_add_to_page_cache+0x6a9/0x10c0 mm/shmem.c:699 shmem_getpage_gfp+0xa65/0x2480 mm/shmem.c:1952 shmem_getpage mm/shmem.c:161 [inline] shmem_write_begin+0xca/0x1b0 mm/shmem.c:2497 generic_perform_write+0x2cd/0x570 mm/filemap.c:3509 __generic_file_write_iter+0x23c/0x560 mm/filemap.c:3638 generic_file_write_iter+0xaf/0x1c0 mm/filemap.c:3670 __kernel_write+0x5ab/0x9d0 fs/read_write.c:550 dump_emit+0x261/0x3a0 fs/coredump.c:849 dump_user_range+0x71/0x1a0 fs/coredump.c:902 elf_core_dump+0x33bd/0x3c10 fs/binfmt_elf.c:2290 do_coredump+0x1eb8/0x2d60 fs/coredump.c:811 get_signal+0x102c/0x1410 kernel/signal.c:2779 arch_do_signal_or_restart+0xc4/0x1270 arch/x86/kernel/signal.c:805 handle_signal_work kernel/entry/common.c:145 [inline] exit_to_user_mode_loop+0x9b/0xd0 kernel/entry/common.c:169 exit_to_user_mode_prepare kernel/entry/common.c:199 [inline] irqentry_exit_to_user_mode+0x4e/0x80 kernel/entry/common.c:287 irqentry_exit+0x12/0x60 kernel/entry/common.c:375 exc_page_fault+0x33d/0x5b0 arch/x86/mm/fault.c:1487 asm_exc_page_fault+0x1e/0x30 arch/x86/include/asm/idtentry.h:571 RIP: 0033:0x7f595c31f757 Code: 88 15 a2 5f e9 00 88 05 9f 5f e9 00 c3 50 48 8d 35 20 13 1c 00 48 8d 3d 26 13 1c 00 31 c0 e8 30 f7 ff ff 53 89 fb 48 83 ec 10 <64> 8b 04 25 94 ff ff ff 85 c0 74 2a 89 fe 31 c0 bf 3c 00 00 00 e8 RSP: 002b:00007f595aaa8120 EFLAGS: 00010202 RAX: 0000000000000000 RBX: 000000000000000b RCX: 00007f595c45e169 RDX: 00007f595aaa8140 RSI: 00007f595aaa8270 RDI: 000000000000000b RBP: 00007f595c4e0a68 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f595c685fa0 R15: 00007ffc05e248b8 Allocated by task 2342: 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:430 [inline] ____kasan_kmalloc+0xdb/0x110 mm/kasan/common.c:509 __kasan_kmalloc+0x9/0x10 mm/kasan/common.c:518 kasan_kmalloc include/linux/kasan.h:254 [inline] kmem_cache_alloc_trace+0x18a/0x2e0 mm/slub.c:2974 kmalloc include/linux/slab.h:552 [inline] kzalloc include/linux/slab.h:664 [inline] alloc_super+0x5d/0x780 fs/super.c:203 sget+0x1e5/0x4c0 fs/super.c:627 mount_bdev+0xea/0x370 fs/super.c:1415 f2fs_mount+0x34/0x40 fs/f2fs/super.c:4548 legacy_get_tree+0xf1/0x190 fs/fs_context.c:593 vfs_get_tree+0x88/0x290 fs/super.c:1572 do_new_mount+0x2ba/0xb30 fs/namespace.c:2917 path_mount+0x56f/0xcb0 fs/namespace.c:3247 do_mount fs/namespace.c:3260 [inline] __do_sys_mount fs/namespace.c:3468 [inline] __se_sys_mount+0x2c4/0x3b0 fs/namespace.c:3445 __x64_sys_mount+0xbf/0xd0 fs/namespace.c:3445 do_syscall_64+0x31/0x40 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x61/0xcb Freed by task 5620: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track+0x4b/0x70 mm/kasan/common.c:45 kasan_set_free_info+0x23/0x40 mm/kasan/generic.c:370 ____kasan_slab_free+0x121/0x160 mm/kasan/common.c:362 __kasan_slab_free+0x11/0x20 mm/kasan/common.c:370 kasan_slab_free include/linux/kasan.h:220 [inline] slab_free_hook mm/slub.c:1595 [inline] slab_free_freelist_hook+0xc0/0x190 mm/slub.c:1621 slab_free mm/slub.c:3203 [inline] kfree+0xc3/0x270 mm/slub.c:4191 skb_free_head net/core/skbuff.c:606 [inline] skb_release_data+0x5c6/0x6f0 net/core/skbuff.c:626 skb_release_all net/core/skbuff.c:680 [inline] __kfree_skb net/core/skbuff.c:694 [inline] consume_skb+0xac/0x250 net/core/skbuff.c:851 netlink_broadcast_filtered+0x114e/0x1270 net/netlink/af_netlink.c:1517 netlink_broadcast net/netlink/af_netlink.c:1539 [inline] nlmsg_multicast include/net/netlink.h:1033 [inline] nlmsg_notify+0x101/0x1c0 net/netlink/af_netlink.c:2528 rtnl_notify net/core/rtnetlink.c:737 [inline] rtmsg_ifinfo_send net/core/rtnetlink.c:3868 [inline] rtmsg_ifinfo_event net/core/rtnetlink.c:3883 [inline] rtmsg_ifinfo+0xe7/0x120 net/core/rtnetlink.c:3889 __dev_notify_flags+0xdd/0x610 net/core/dev.c:8567 dev_change_flags+0xf0/0x1a0 net/core/dev.c:8609 do_setlink+0xc5c/0x3c30 net/core/rtnetlink.c:2732 rtnl_group_changelink net/core/rtnetlink.c:3251 [inline] __rtnl_newlink net/core/rtnetlink.c:3420 [inline] rtnl_newlink+0x109a/0x2000 net/core/rtnetlink.c:3530 rtnetlink_rcv_msg+0x955/0xc50 net/core/rtnetlink.c:5610 netlink_rcv_skb+0x1cf/0x410 net/netlink/af_netlink.c:2485 rtnetlink_rcv+0x1c/0x20 net/core/rtnetlink.c:5628 netlink_unicast_kernel net/netlink/af_netlink.c:1307 [inline] netlink_unicast+0x8df/0xac0 net/netlink/af_netlink.c:1333 netlink_sendmsg+0xa46/0xd00 net/netlink/af_netlink.c:1901 sock_sendmsg_nosec net/socket.c:652 [inline] __sock_sendmsg net/socket.c:664 [inline] ____sys_sendmsg+0x59e/0x8f0 net/socket.c:2376 ___sys_sendmsg+0x252/0x2e0 net/socket.c:2430 __sys_sendmsg net/socket.c:2459 [inline] __do_sys_sendmsg net/socket.c:2468 [inline] __se_sys_sendmsg+0x1b1/0x280 net/socket.c:2466 __x64_sys_sendmsg+0x7b/0x90 net/socket.c:2466 do_syscall_64+0x31/0x40 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x61/0xcb Last potentially related work creation: kasan_save_stack+0x3b/0x60 mm/kasan/common.c:38 __kasan_record_aux_stack+0xd3/0x100 mm/kasan/generic.c:348 kasan_record_aux_stack_noalloc+0xb/0x10 mm/kasan/generic.c:358 insert_work+0x56/0x310 kernel/workqueue.c:1352 __queue_work+0x970/0xd10 kernel/workqueue.c:1518 queue_work_on+0x105/0x160 kernel/workqueue.c:1545 queue_work include/linux/workqueue.h:515 [inline] schedule_work include/linux/workqueue.h:576 [inline] destroy_super_rcu+0xd1/0xe0 fs/super.c:172 rcu_do_batch+0x597/0xc40 kernel/rcu/tree.c:2494 rcu_core+0x5ad/0xe40 kernel/rcu/tree.c:2735 rcu_core_si+0x9/0x10 kernel/rcu/tree.c:2748 __do_softirq+0x268/0x5bb kernel/softirq.c:309 Second to last potentially related work creation: kasan_save_stack+0x3b/0x60 mm/kasan/common.c:38 __kasan_record_aux_stack+0xd3/0x100 mm/kasan/generic.c:348 kasan_record_aux_stack_noalloc+0xb/0x10 mm/kasan/generic.c:358 __call_rcu kernel/rcu/tree.c:2976 [inline] call_rcu+0x135/0x11f0 kernel/rcu/tree.c:3050 __put_super+0x25c/0x2b0 fs/super.c:299 put_super fs/super.c:313 [inline] deactivate_locked_super+0xe1/0x110 fs/super.c:346 mount_bdev+0x27e/0x370 fs/super.c:1444 f2fs_mount+0x34/0x40 fs/f2fs/super.c:4548 legacy_get_tree+0xf1/0x190 fs/fs_context.c:593 vfs_get_tree+0x88/0x290 fs/super.c:1572 do_new_mount+0x2ba/0xb30 fs/namespace.c:2917 path_mount+0x56f/0xcb0 fs/namespace.c:3247 do_mount fs/namespace.c:3260 [inline] __do_sys_mount fs/namespace.c:3468 [inline] __se_sys_mount+0x2c4/0x3b0 fs/namespace.c:3445 __x64_sys_mount+0xbf/0xd0 fs/namespace.c:3445 do_syscall_64+0x31/0x40 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x61/0xcb The buggy address belongs to the object at ffff888105db5000 which belongs to the cache kmalloc-2k of size 2048 The buggy address is located 1136 bytes inside of 2048-byte region [ffff888105db5000, ffff888105db5800) The buggy address belongs to the page: page:ffffea0004176c00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x105db0 head:ffffea0004176c00 order:3 compound_mapcount:0 compound_pincount:0 flags: 0x4000000000010200(slab|head) raw: 4000000000010200 dead000000000100 dead000000000122 ffff888100042d80 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 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 1, ts 1252130417, free_ts 0 set_page_owner include/linux/page_owner.h:35 [inline] post_alloc_hook mm/page_alloc.c:2456 [inline] prep_new_page+0x166/0x180 mm/page_alloc.c:2462 get_page_from_freelist+0x2d8c/0x2f30 mm/page_alloc.c:4254 __alloc_pages_nodemask+0x435/0xaf0 mm/page_alloc.c:5349 alloc_slab_page mm/slub.c:-1 [inline] allocate_slab mm/slub.c:1808 [inline] new_slab+0x80/0x400 mm/slub.c:1869 new_slab_objects mm/slub.c:2627 [inline] ___slab_alloc+0x302/0x4b0 mm/slub.c:2791 __slab_alloc+0x63/0xa0 mm/slub.c:2831 slab_alloc_node mm/slub.c:2913 [inline] slab_alloc mm/slub.c:2955 [inline] kmem_cache_alloc_trace+0x1bd/0x2e0 mm/slub.c:2972 kmalloc include/linux/slab.h:552 [inline] kzalloc include/linux/slab.h:664 [inline] pci_alloc_bus drivers/pci/probe.c:550 [inline] pci_register_host_bridge+0x14a/0x11c0 drivers/pci/probe.c:888 pci_create_root_bus+0x359/0x3f0 drivers/pci/probe.c:2993 acpi_pci_root_create+0x775/0xd10 drivers/acpi/pci_root.c:907 pci_acpi_scan_root+0x2c5/0x520 arch/x86/pci/acpi.c:368 acpi_pci_root_add+0xcdb/0x18c0 drivers/acpi/pci_root.c:607 acpi_scan_attach_handler drivers/acpi/scan.c:1988 [inline] acpi_bus_attach+0x75f/0xc50 drivers/acpi/scan.c:2032 acpi_bus_attach+0x240/0xc50 drivers/acpi/scan.c:2053 acpi_bus_attach+0x240/0xc50 drivers/acpi/scan.c:2053 acpi_bus_scan+0x104/0x150 drivers/acpi/scan.c:2105 page_owner free stack trace missing Memory state around the buggy address: ffff888105db5300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888105db5380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff888105db5400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888105db5480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888105db5500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb 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