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BUG: KCSAN: data-race in __filemap_remove_folio / folio_mapping

write to 0xffffea0004c99fd8 of 8 bytes by task 9244 on cpu 1:
 page_cache_delete mm/filemap.c:144 [inline]
 __filemap_remove_folio+0x1a5/0x2a0 mm/filemap.c:227
 filemap_remove_folio+0x6d/0x1d0 mm/filemap.c:256
 truncate_inode_folio+0x42/0x50 mm/truncate.c:176
 shmem_undo_range+0x244/0xa80 mm/shmem.c:1116
 shmem_truncate_range mm/shmem.c:1232 [inline]
 shmem_evict_inode+0x134/0x520 mm/shmem.c:1360
 evict+0x2e0/0x550 fs/inode.c:810
 iput_final fs/inode.c:1914 [inline]
 iput+0x4ed/0x650 fs/inode.c:1966
 dentry_unlink_inode+0x24f/0x260 fs/dcache.c:466
 __dentry_kill+0x18d/0x4b0 fs/dcache.c:669
 dput+0x5e/0xd0 fs/dcache.c:911
 __fput+0x444/0x650 fs/file_table.c:476
 ____fput+0x1c/0x30 fs/file_table.c:496
 task_work_run+0x12e/0x1a0 kernel/task_work.c:227
 exit_task_work include/linux/task_work.h:40 [inline]
 do_exit+0x483/0x15c0 kernel/exit.c:966
 do_group_exit+0xff/0x140 kernel/exit.c:1107
 get_signal+0xe58/0xf70 kernel/signal.c:3034
 arch_do_signal_or_restart+0x96/0x440 arch/x86/kernel/signal.c:337
 exit_to_user_mode_loop kernel/entry/common.c:40 [inline]
 exit_to_user_mode_prepare include/linux/irq-entry-common.h:225 [inline]
 irqentry_exit_to_user_mode+0x5b/0xa0 kernel/entry/common.c:73
 irqentry_exit+0x12/0x50 kernel/entry/common.c:191
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623

read to 0xffffea0004c99fd8 of 8 bytes by task 9288 on cpu 0:
 folio_mapping+0xa1/0xe0 mm/util.c:702
 folio_evictable mm/internal.h:499 [inline]
 sort_folio mm/vmscan.c:4480 [inline]
 scan_folios mm/vmscan.c:4607 [inline]
 isolate_folios mm/vmscan.c:4703 [inline]
 evict_folios+0xe05/0x3590 mm/vmscan.c:4733
 try_to_shrink_lruvec+0x5b5/0x950 mm/vmscan.c:4908
 lru_gen_shrink_lruvec mm/vmscan.c:5057 [inline]
 shrink_lruvec+0x22e/0x1b50 mm/vmscan.c:5818
 shrink_node_memcgs mm/vmscan.c:6054 [inline]
 shrink_node+0x686/0x2120 mm/vmscan.c:6095
 shrink_zones mm/vmscan.c:6339 [inline]
 do_try_to_free_pages+0x3f6/0xcd0 mm/vmscan.c:6401
 try_to_free_mem_cgroup_pages+0x1ab/0x410 mm/vmscan.c:6729
 try_charge_memcg+0x358/0x9e0 mm/memcontrol.c:2355
 obj_cgroup_charge_pages+0xa6/0x150 mm/memcontrol.c:2798
 __memcg_kmem_charge_page+0x9f/0x170 mm/memcontrol.c:2842
 __alloc_frozen_pages_noprof+0x188/0x360 mm/page_alloc.c:5200
 alloc_pages_mpol+0xb3/0x260 mm/mempolicy.c:2416
 alloc_frozen_pages_noprof mm/mempolicy.c:2487 [inline]
 alloc_pages_noprof+0x90/0x130 mm/mempolicy.c:2507
 vm_area_alloc_pages mm/vmalloc.c:3647 [inline]
 __vmalloc_area_node mm/vmalloc.c:3724 [inline]
 __vmalloc_node_range_noprof+0x7a5/0xed0 mm/vmalloc.c:3897
 __bpf_map_area_alloc kernel/bpf/syscall.c:401 [inline]
 bpf_map_area_alloc+0xfa/0x150 kernel/bpf/syscall.c:408
 array_map_alloc+0x1d3/0x3c0 kernel/bpf/arraymap.c:142
 map_create+0x83d/0xda0 kernel/bpf/syscall.c:1497
 __sys_bpf+0x54e/0x7c0 kernel/bpf/syscall.c:6116
 __do_sys_bpf kernel/bpf/syscall.c:6244 [inline]
 __se_sys_bpf kernel/bpf/syscall.c:6242 [inline]
 __x64_sys_bpf+0x41/0x50 kernel/bpf/syscall.c:6242
 x64_sys_call+0x2aee/0x3000 arch/x86/include/generated/asm/syscalls_64.h:322
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xd2/0x200 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0xffff8881198b1f00 -> 0x0000000000000000

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 9288 Comm: syz.0.1842 Not tainted syzkaller #0 PREEMPT(voluntary) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
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