syzbot

==================================================================
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+0x9e0/0xac0 mm/filemap.c:175
Read of size 4 at addr ffff888124c60470 by task syz.6.678/3036

CPU: 1 PID: 3036 Comm: syz.6.678 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
Call Trace:
 __dump_stack+0x21/0x24 lib/dump_stack.c:77
 dump_stack_lvl+0x1a7/0x208 lib/dump_stack.c:118
 print_address_description+0x7f/0x2c0 mm/kasan/report.c:248
 __kasan_report mm/kasan/report.c:435 [inline]
 kasan_report+0xe2/0x130 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+0x9e0/0xac0 mm/filemap.c:175
 __delete_from_page_cache+0xc3/0x470 mm/filemap.c:243
 __remove_mapping+0x562/0x690 mm/vmscan.c:985
 shrink_page_list+0x21a9/0x4250 mm/vmscan.c:1498
 shrink_inactive_list+0x532/0xef0 mm/vmscan.c:2075
 shrink_list mm/vmscan.c:2294 [inline]
 shrink_lruvec+0x1235/0x2860 mm/vmscan.c:5473
 shrink_node_memcgs mm/vmscan.c:5660 [inline]
 shrink_node+0xf0c/0x2690 mm/vmscan.c:5690
 shrink_zones mm/vmscan.c:5896 [inline]
 do_try_to_free_pages+0x603/0x1590 mm/vmscan.c:5954
 try_to_free_mem_cgroup_pages+0x261/0x610 mm/vmscan.c:6272
 try_charge+0x43e/0x1500 mm/memcontrol.c:2745
 __mem_cgroup_charge+0x14c/0x6d0 mm/memcontrol.c:6871
 mem_cgroup_charge include/linux/memcontrol.h:458 [inline]
 shmem_add_to_page_cache+0x574/0xe30 mm/shmem.c:699
 shmem_getpage_gfp+0x8eb/0x2120 mm/shmem.c:1952
 shmem_fault+0x2b5/0x650 mm/shmem.c:2139
 __do_fault mm/memory.c:4064 [inline]
 do_read_fault mm/memory.c:4408 [inline]
 do_fault mm/memory.c:4536 [inline]
 handle_pte_fault+0x2424/0x37d0 mm/memory.c:4800
 __handle_mm_fault mm/memory.c:4953 [inline]
 handle_mm_fault+0xf81/0x1710 mm/memory.c:5367
 faultin_page mm/gup.c:902 [inline]
 __get_user_pages+0xbf8/0x1400 mm/gup.c:1121
 populate_vma_page_range mm/gup.c:1454 [inline]
 __mm_populate+0x34f/0x440 mm/gup.c:1502
 mm_populate include/linux/mm.h:2793 [inline]
 vm_mmap_pgoff+0x254/0x370 mm/util.c:548
 ksys_mmap_pgoff+0xfd/0x1e0 mm/mmap.c:1712
 __do_sys_mmap arch/x86/kernel/sys_x86_64.c:95 [inline]
 __se_sys_mmap arch/x86/kernel/sys_x86_64.c:86 [inline]
 __x64_sys_mmap+0xfa/0x110 arch/x86/kernel/sys_x86_64.c:86
 do_syscall_64+0x31/0x40 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x61/0xcb
RIP: 0033:0x7fca7615ae59
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:00007fca74bb5028 EFLAGS: 00000246 ORIG_RAX: 0000000000000009
RAX: ffffffffffffffda RBX: 00007fca763d3fa0 RCX: 00007fca7615ae59
RDX: b635773f06ebbeef RSI: 0000000000b36000 RDI: 0000200000000000
RBP: 00007fca761f0d6f R08: ffffffffffffffff R09: 0000000000000000
R10: 0000000000008031 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fca763d4038 R14: 00007fca763d3fa0 R15: 00007fffdf045dc8

Allocated by task 1912:
 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 mm/kasan/common.c:509 [inline]
 __kasan_kmalloc+0xda/0x110 mm/kasan/common.c:518
 kasan_kmalloc include/linux/kasan.h:254 [inline]
 kmem_cache_alloc_trace+0x181/0x2e0 mm/slub.c:2979
 kmalloc include/linux/slab.h:555 [inline]
 kzalloc include/linux/slab.h:667 [inline]
 alloc_super+0x5e/0x7a0 fs/super.c:203
 sget+0x1e4/0x4c0 fs/super.c:627
 mount_bdev+0xf6/0x3a0 fs/super.c:1415
 f2fs_mount+0x34/0x40 fs/f2fs/super.c:4598
 legacy_get_tree+0xed/0x190 fs/fs_context.c:593
 vfs_get_tree+0x89/0x260 fs/super.c:1572
 do_new_mount+0x25a/0xa20 fs/namespace.c:3006
 path_mount+0x585/0xc90 fs/namespace.c:3336
 do_mount fs/namespace.c:3349 [inline]
 __do_sys_mount fs/namespace.c:3557 [inline]
 __se_sys_mount+0x320/0x390 fs/namespace.c:3534
 __x64_sys_mount+0xbf/0xd0 fs/namespace.c:3534
 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+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+0x52/0x310 kernel/workqueue.c:1352
 __queue_work+0x923/0xca0 kernel/workqueue.c:1518
 queue_work_on+0xe6/0x140 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+0x4ef/0xab0 kernel/rcu/tree.c:2494
 rcu_core+0x577/0xd80 kernel/rcu/tree.c:2735
 rcu_core_si+0x9/0x10 kernel/rcu/tree.c:2748
 __do_softirq+0x255/0x563 kernel/softirq.c:309

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 kernel/rcu/tree.c:2980 [inline]
 call_rcu+0x11a/0x10b0 kernel/rcu/tree.c:3054
 __put_super+0x254/0x2b0 fs/super.c:299
 put_super fs/super.c:313 [inline]
 deactivate_locked_super+0xd4/0x100 fs/super.c:346
 mount_bdev+0x2a9/0x3a0 fs/super.c:1444
 f2fs_mount+0x34/0x40 fs/f2fs/super.c:4598
 legacy_get_tree+0xed/0x190 fs/fs_context.c:593
 vfs_get_tree+0x89/0x260 fs/super.c:1572
 do_new_mount+0x25a/0xa20 fs/namespace.c:3006
 path_mount+0x585/0xc90 fs/namespace.c:3336
 do_mount fs/namespace.c:3349 [inline]
 __do_sys_mount fs/namespace.c:3557 [inline]
 __se_sys_mount+0x320/0x390 fs/namespace.c:3534
 __x64_sys_mount+0xbf/0xd0 fs/namespace.c:3534
 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 ffff888124c60000
 which belongs to the cache kmalloc-2k of size 2048
The buggy address is located 1136 bytes inside of
 2048-byte region [ffff888124c60000, ffff888124c60800)
The buggy address belongs to the page:
page:ffffea0004931800 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff888124c67000 pfn:0x124c60
head:ffffea0004931800 order:3 compound_mapcount:0 compound_pincount:0
flags: 0x4000000000010200(slab|head)
raw: 4000000000010200 ffffea0004994408 ffffea0004743208 ffff888100042d80
raw: ffff888124c67000 0000000000080004 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 1914, ts 121737536791, free_ts 121673739784
 set_page_owner include/linux/page_owner.h:35 [inline]
 post_alloc_hook mm/page_alloc.c:2456 [inline]
 prep_new_page+0x179/0x180 mm/page_alloc.c:2462
 get_page_from_freelist+0x223b/0x23d0 mm/page_alloc.c:4254
 __alloc_pages_nodemask+0x290/0x620 mm/page_alloc.c:5384
 alloc_slab_page mm/slub.c:-1 [inline]
 allocate_slab mm/slub.c:1813 [inline]
 new_slab+0x84/0x3f0 mm/slub.c:1874
 new_slab_objects mm/slub.c:2632 [inline]
 ___slab_alloc+0x2a6/0x450 mm/slub.c:2796
 __slab_alloc+0x63/0xa0 mm/slub.c:2836
 slab_alloc_node mm/slub.c:2918 [inline]
 slab_alloc mm/slub.c:2960 [inline]
 __kmalloc_track_caller+0x1ec/0x320 mm/slub.c:4541
 kmemdup+0x26/0x60 mm/util.c:131
 neigh_sysctl_register+0xbe/0xa90 net/core/neighbour.c:3652
 devinet_sysctl_register+0xaf/0x1e0 net/ipv4/devinet.c:2635
 inetdev_init+0x273/0x480 net/ipv4/devinet.c:277
 inetdev_event+0x1f7/0x1040 net/ipv4/devinet.c:1544
 notifier_call_chain kernel/notifier.c:83 [inline]
 raw_notifier_call_chain+0x90/0x100 kernel/notifier.c:410
 call_netdevice_notifiers_info net/core/dev.c:2054 [inline]
 call_netdevice_notifiers_extack net/core/dev.c:2066 [inline]
 call_netdevice_notifiers+0x119/0x190 net/core/dev.c:2080
 register_netdevice+0x1056/0x13e0 net/core/dev.c:10100
 tun_set_iff+0x812/0xe00 drivers/net/tun.c:2856
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:28 [inline]
 free_pages_prepare mm/page_alloc.c:1349 [inline]
 free_pcp_prepare mm/page_alloc.c:1421 [inline]
 free_unref_page_prepare+0x2b7/0x2d0 mm/page_alloc.c:3336
 free_unref_page mm/page_alloc.c:3391 [inline]
 free_the_page mm/page_alloc.c:5443 [inline]
 __free_pages+0x146/0x3b0 mm/page_alloc.c:5454
 __vunmap+0x86d/0x9f0 mm/vmalloc.c:2307
 __vfree mm/vmalloc.c:2356 [inline]
 vfree+0x61/0x90 mm/vmalloc.c:2387
 kcov_put kernel/kcov.c:408 [inline]
 kcov_close+0x2b/0x50 kernel/kcov.c:510
 __fput+0x2fb/0x770 fs/file_table.c:281
 ____fput+0x15/0x20 fs/file_table.c:314
 task_work_run+0x127/0x190 kernel/task_work.c:189
 exit_task_work include/linux/task_work.h:33 [inline]
 do_exit+0xa87/0x2500 kernel/exit.c:873
 do_group_exit+0x141/0x310 kernel/exit.c:987
 __do_sys_exit_group kernel/exit.c:998 [inline]
 __se_sys_exit_group kernel/exit.c:996 [inline]
 __x64_sys_exit_group+0x3f/0x40 kernel/exit.c:996
 do_syscall_64+0x31/0x40 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x61/0xcb

Memory state around the buggy address:
 ffff888124c60300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff888124c60380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff888124c60400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                                             ^
 ffff888124c60480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff888124c60500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
syz.6.678 invoked oom-killer: gfp_mask=0xcc0(GFP_KERNEL), order=0, oom_score_adj=1000
CPU: 1 PID: 3036 Comm: syz.6.678 Tainted: G    B             syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
Call Trace:
 __dump_stack+0x21/0x24 lib/dump_stack.c:77
 dump_stack_lvl+0x1a7/0x208 lib/dump_stack.c:118
 dump_stack+0x15/0x1c lib/dump_stack.c:135
 dump_header+0xdd/0x650 mm/oom_kill.c:508
 oom_kill_process+0x1fa/0x2c0 mm/oom_kill.c:1038
 out_of_memory+0x93f/0xd20 mm/oom_kill.c:1181
 mem_cgroup_out_of_memory+0x2d5/0x3b0 mm/memcontrol.c:1736
 mem_cgroup_oom mm/memcontrol.c:1971 [inline]
 try_charge+0xf69/0x1500 mm/memcontrol.c:2796
 __mem_cgroup_charge+0x14c/0x6d0 mm/memcontrol.c:6871
 mem_cgroup_charge include/linux/memcontrol.h:458 [inline]
 shmem_add_to_page_cache+0x574/0xe30 mm/shmem.c:699
 shmem_getpage_gfp+0x8eb/0x2120 mm/shmem.c:1952
 shmem_fault+0x2b5/0x650 mm/shmem.c:2139
 __do_fault mm/memory.c:4064 [inline]
 do_read_fault mm/memory.c:4408 [inline]
 do_fault mm/memory.c:4536 [inline]
 handle_pte_fault+0x2424/0x37d0 mm/memory.c:4800
 __handle_mm_fault mm/memory.c:4953 [inline]
 handle_mm_fault+0xf81/0x1710 mm/memory.c:5367
 faultin_page mm/gup.c:902 [inline]
 __get_user_pages+0xbf8/0x1400 mm/gup.c:1121
 populate_vma_page_range mm/gup.c:1454 [inline]
 __mm_populate+0x34f/0x440 mm/gup.c:1502
 mm_populate include/linux/mm.h:2793 [inline]
 vm_mmap_pgoff+0x254/0x370 mm/util.c:548
 ksys_mmap_pgoff+0xfd/0x1e0 mm/mmap.c:1712
 __do_sys_mmap arch/x86/kernel/sys_x86_64.c:95 [inline]
 __se_sys_mmap arch/x86/kernel/sys_x86_64.c:86 [inline]
 __x64_sys_mmap+0xfa/0x110 arch/x86/kernel/sys_x86_64.c:86
 do_syscall_64+0x31/0x40 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x61/0xcb
RIP: 0033:0x7fca7615ae59
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:00007fca74bb5028 EFLAGS: 00000246 ORIG_RAX: 0000000000000009
RAX: ffffffffffffffda RBX: 00007fca763d3fa0 RCX: 00007fca7615ae59
RDX: b635773f06ebbeef RSI: 0000000000b36000 RDI: 0000200000000000
RBP: 00007fca761f0d6f R08: ffffffffffffffff R09: 0000000000000000
R10: 0000000000008031 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fca763d4038 R14: 00007fca763d3fa0 R15: 00007fffdf045dc8
memory: usage 307200kB, limit 307200kB, failcnt 9443
memory+swap: usage 421192kB, limit 9007199254740988kB, failcnt 0
kmem: usage 0kB, limit 9007199254740988kB, failcnt 0
Memory cgroup stats for /syz6:
anon 270336
file 302911488
kernel_stack 0
percpu 0
sock 0
shmem 302911488
file_mapped 7839744
file_dirty 0
file_writeback 0
anon_thp 0
inactive_anon 312258560
active_anon 2162688
inactive_file 0
active_file 135168
unevictable 0
slab_reclaimable 0
slab_unreclaimable 0
slab 0
workingset_refault_anon 0
workingset_refault_file 0
workingset_activate_anon 0
workingset_activate_file 0
workingset_restore_anon 0
workingset_restore_file 0
oom-kill:constraint=CONSTRAINT_MEMCG,nodemask=(null),cpuset=syz6,mems_allowed=0,oom_memcg=/syz6,task_memcg=/syz6,task=syz.6.640,pid=2879,uid=0
Memory cgroup out of memory: Killed process 2879 (syz.6.640) total-vm:90316kB, anon-rss:1272kB, file-rss:54144kB, shmem-rss:0kB, UID:0 pgtables:192kB oom_score_adj:1000
syz.6.678 invoked oom-killer: gfp_mask=0xcc0(GFP_KERNEL), order=0, oom_score_adj=1000
CPU: 1 PID: 3036 Comm: syz.6.678 Tainted: G    B             syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
Call Trace:
 __dump_stack+0x21/0x24 lib/dump_stack.c:77
 dump_stack_lvl+0x1a7/0x208 lib/dump_stack.c:118
 dump_stack+0x15/0x1c lib/dump_stack.c:135
 dump_header+0xdd/0x650 mm/oom_kill.c:508
 oom_kill_process+0x1fa/0x2c0 mm/oom_kill.c:1038
 out_of_memory+0x93f/0xd20 mm/oom_kill.c:1181
 mem_cgroup_out_of_memory+0x2d5/0x3b0 mm/memcontrol.c:1736
 mem_cgroup_oom mm/memcontrol.c:1971 [inline]
 try_charge+0xf69/0x1500 mm/memcontrol.c:2796
 __mem_cgroup_charge+0x14c/0x6d0 mm/memcontrol.c:6871
 mem_cgroup_charge include/linux/memcontrol.h:458 [inline]
 shmem_add_to_page_cache+0x574/0xe30 mm/shmem.c:699
 shmem_getpage_gfp+0x8eb/0x2120 mm/shmem.c:1952
 shmem_fault+0x2b5/0x650 mm/shmem.c:2139
 __do_fault mm/memory.c:4064 [inline]
 do_read_fault mm/memory.c:4408 [inline]
 do_fault mm/memory.c:4536 [inline]
 handle_pte_fault+0x2424/0x37d0 mm/memory.c:4800
 __handle_mm_fault mm/memory.c:4953 [inline]
 handle_mm_fault+0xf81/0x1710 mm/memory.c:5367
 faultin_page mm/gup.c:902 [inline]
 __get_user_pages+0xbf8/0x1400 mm/gup.c:1121
 populate_vma_page_range mm/gup.c:1454 [inline]
 __mm_populate+0x34f/0x440 mm/gup.c:1502
 mm_populate include/linux/mm.h:2793 [inline]
 vm_mmap_pgoff+0x254/0x370 mm/util.c:548
 ksys_mmap_pgoff+0xfd/0x1e0 mm/mmap.c:1712
 __do_sys_mmap arch/x86/kernel/sys_x86_64.c:95 [inline]
 __se_sys_mmap arch/x86/kernel/sys_x86_64.c:86 [inline]
 __x64_sys_mmap+0xfa/0x110 arch/x86/kernel/sys_x86_64.c:86
 do_syscall_64+0x31/0x40 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x61/0xcb
RIP: 0033:0x7fca7615ae59
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:00007fca74bb5028 EFLAGS: 00000246 ORIG_RAX: 0000000000000009
RAX: ffffffffffffffda RBX: 00007fca763d3fa0 RCX: 00007fca7615ae59
RDX: b635773f06ebbeef RSI: 0000000000b36000 RDI: 0000200000000000
RBP: 00007fca761f0d6f R08: ffffffffffffffff R09: 0000000000000000
R10: 0000000000008031 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fca763d4038 R14: 00007fca763d3fa0 R15: 00007fffdf045dc8
memory: usage 278060kB, limit 307200kB, failcnt 10948
memory+swap: usage 369548kB, limit 9007199254740988kB, failcnt 0
kmem: usage 0kB, limit 9007199254740988kB, failcnt 0
Memory cgroup stats for /syz6:
anon 270336
file 274391040
kernel_stack 0
percpu 0
sock 0
shmem 274391040
file_mapped 8380416
file_dirty 0
file_writeback 0
anon_thp 0
inactive_anon 282927104
active_anon 1892352
inactive_file 0
active_file 135168
unevictable 0
slab_reclaimable 0
slab_unreclaimable 0
slab 0
workingset_refault_anon 0
workingset_refault_file 0
workingset_activate_anon 0
workingset_activate_file 0
workingset_restore_anon 0
workingset_restore_file 0
oom-kill:constraint=CONSTRAINT_MEMCG,nodemask=(null),cpuset=syz6,mems_allowed=0,oom_memcg=/syz6,task_memcg=/syz6,task=syz.6.640,pid=2877,uid=0
Memory cgroup out of memory: Killed process 2877 (syz.6.640) total-vm:90316kB, anon-rss:1272kB, file-rss:54144kB, shmem-rss:0kB, UID:0 pgtables:192kB oom_score_adj:1000