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BUG: KCSAN: data-race in __filemap_remove_folio / folio_mapping

write to 0xffffea00048cea58 of 8 bytes by task 5008 on cpu 1:
 page_cache_delete mm/filemap.c:145 [inline]
 __filemap_remove_folio+0x201/0x2e0 mm/filemap.c:227
 filemap_remove_folio+0x6d/0x1d0 mm/filemap.c:257
 truncate_inode_folio+0x42/0x50 mm/truncate.c:176
 shmem_undo_range+0x27f/0xb60 mm/shmem.c:1155
 shmem_fallocate+0x84e/0x8f0 mm/shmem.c:3718
 vfs_fallocate+0x3ac/0x400 fs/open.c:338
 ksys_fallocate fs/open.c:362 [inline]
 __do_sys_fallocate fs/open.c:367 [inline]
 __se_sys_fallocate fs/open.c:365 [inline]
 __x64_sys_fallocate+0x7a/0xd0 fs/open.c:365
 x64_sys_call+0x298e/0x3020 arch/x86/include/generated/asm/syscalls_64.h:286
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x136/0x3c0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffffea00048cea58 of 8 bytes by task 5013 on cpu 0:
 folio_mapping+0xa1/0xe0 mm/util.c:732
 folio_evictable mm/internal.h:575 [inline]
 sort_folio mm/vmscan.c:4589 [inline]
 scan_folios mm/vmscan.c:4692 [inline]
 isolate_folios mm/vmscan.c:4780 [inline]
 evict_folios+0xdc7/0x2d60 mm/vmscan.c:4822
 try_to_shrink_lruvec+0x7c5/0xb10 mm/vmscan.c:4980
 lru_gen_shrink_lruvec mm/vmscan.c:5125 [inline]
 shrink_lruvec+0x25e/0x1b60 mm/vmscan.c:5885
 shrink_node_memcgs mm/vmscan.c:6124 [inline]
 shrink_node+0x69d/0x20f0 mm/vmscan.c:6168
 shrink_zones mm/vmscan.c:6407 [inline]
 do_try_to_free_pages+0x408/0xc90 mm/vmscan.c:6469
 try_to_free_mem_cgroup_pages+0x201/0x420 mm/vmscan.c:6791
 mem_cgroup_resize_max+0x1cd/0x240 mm/memcontrol-v1.c:1522
 mem_cgroup_write+0x1ad/0x250 mm/memcontrol-v1.c:-1
 cgroup_file_write+0x197/0x350 kernel/cgroup/cgroup.c:4316
 kernfs_fop_write_iter+0x1d2/0x2e0 fs/kernfs/file.c:345
 new_sync_write fs/read_write.c:595 [inline]
 vfs_write+0x57d/0x990 fs/read_write.c:687
 ksys_write+0xdc/0x1a0 fs/read_write.c:739
 __do_sys_write fs/read_write.c:750 [inline]
 __se_sys_write fs/read_write.c:747 [inline]
 __x64_sys_write+0x40/0x50 fs/read_write.c:747
 x64_sys_call+0x27e1/0x3020 arch/x86/include/generated/asm/syscalls_64.h:2
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x136/0x3c0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0xffff88811b4554f0 -> 0x0000000000000000

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 5013 Comm: syz.4.440 Not tainted syzkaller #0 PREEMPT(lazy) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/16/2026
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