syzbot

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BUG: KCSAN: data-race in delete_from_page_cache_batch / folio_mapping

write to 0xffffea0006ddeb98 of 8 bytes by task 12698 on cpu 1:
 page_cache_delete_batch mm/filemap.c:311 [inline]
 delete_from_page_cache_batch+0x310/0x720 mm/filemap.c:337
 truncate_inode_pages_range+0x1fe/0x7e0 mm/truncate.c:405
 truncate_inode_pages+0x24/0x30 mm/truncate.c:485
 kill_bdev block/bdev.c:91 [inline]
 blkdev_flush_mapping+0x9e/0x1a0 block/bdev.c:720
 blkdev_put_whole block/bdev.c:727 [inline]
 bdev_release+0x2bf/0x3d0 block/bdev.c:1152
 blkdev_release+0x15/0x20 block/fops.c:705
 __fput+0x29b/0x630 fs/file_table.c:510
 fput_close_sync+0xad/0x190 fs/file_table.c:615
 __do_sys_close fs/open.c:1507 [inline]
 __se_sys_close fs/open.c:1492 [inline]
 __x64_sys_close+0x55/0xf0 fs/open.c:1492
 x64_sys_call+0x275d/0x3020 arch/x86/include/generated/asm/syscalls_64.h:4
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x12c/0x3b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffffea0006ddeb98 of 8 bytes by task 12706 on cpu 0:
 folio_mapping+0xa1/0xe0 mm/util.c:732
 folio_evictable mm/internal.h:584 [inline]
 lru_add+0x8d/0x460 mm/swap.c:136
 folio_batch_move_lru+0x1d3/0x290 mm/swap.c:172
 lru_add_drain_cpu+0x66/0x210 mm/swap.c:654
 lru_add_drain mm/swap.c:743 [inline]
 __folio_batch_release+0x44/0xb0 mm/swap.c:1065
 folio_batch_release include/linux/folio_batch.h:101 [inline]
 shmem_undo_range+0x327/0xb10 mm/shmem.c:1149
 shmem_truncate_range mm/shmem.c:1277 [inline]
 shmem_evict_inode+0x12e/0x540 mm/shmem.c:1407
 evict+0x2af/0x510 fs/inode.c:841
 iput_final fs/inode.c:1960 [inline]
 iput+0x41a/0x580 fs/inode.c:2009
 dentry_unlink_inode+0x24f/0x260 fs/dcache.c:467
 __dentry_kill+0x13f/0x460 fs/dcache.c:670
 finish_dput+0x2b/0x200 fs/dcache.c:879
 dput+0x52/0x60 fs/dcache.c:928
 end_renaming fs/namei.c:4124 [inline]
 filename_renameat2+0x493/0x6e0 fs/namei.c:6174
 __do_sys_rename fs/namei.c:6216 [inline]
 __se_sys_rename+0x4a/0x1c0 fs/namei.c:6212
 __x64_sys_rename+0x31/0x40 fs/namei.c:6212
 x64_sys_call+0x2b3/0x3020 arch/x86/include/generated/asm/syscalls_64.h:83
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x12c/0x3b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0xffff88810048d928 -> 0x0000000000000000

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 12706 Comm: udevd Tainted: G        W           syzkaller #0 PREEMPT(full) 
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026
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