syzbot

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BUG: KCSAN: data-race in delete_from_page_cache_batch / folio_mapping

write to 0xffffea0004b669d8 of 8 bytes by task 4997 on cpu 0:
 page_cache_delete_batch mm/filemap.c:317 [inline]
 delete_from_page_cache_batch+0x308/0x700 mm/filemap.c:343
 truncate_inode_pages_range+0x1c5/0x6b0 mm/truncate.c:327
 truncate_inode_pages+0x24/0x30 mm/truncate.c:407
 kill_bdev block/bdev.c:91 [inline]
 set_blocksize+0x258/0x270 block/bdev.c:173
 sb_set_blocksize+0x2c/0xb0 block/bdev.c:182
 ext4_load_super fs/ext4/super.c:5107 [inline]
 __ext4_fill_super fs/ext4/super.c:5259 [inline]
 ext4_fill_super+0xdca/0x3a10 fs/ext4/super.c:5733
 get_tree_bdev_flags+0x29f/0x310 fs/super.c:1636
 get_tree_bdev+0x1f/0x30 fs/super.c:1659
 ext4_get_tree+0x1c/0x30 fs/ext4/super.c:5765
 vfs_get_tree+0x56/0x1e0 fs/super.c:1814
 do_new_mount+0x227/0x690 fs/namespace.c:3507
 path_mount+0x49b/0xb30 fs/namespace.c:3834
 do_mount fs/namespace.c:3847 [inline]
 __do_sys_mount fs/namespace.c:4057 [inline]
 __se_sys_mount+0x27c/0x2d0 fs/namespace.c:4034
 __x64_sys_mount+0x67/0x80 fs/namespace.c:4034
 x64_sys_call+0x2c84/0x2dc0 arch/x86/include/generated/asm/syscalls_64.h:166
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xc9/0x1c0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffffea0004b669d8 of 8 bytes by task 3593 on cpu 1:
 folio_mapping+0xa0/0x120 mm/util.c:847
 folio_evictable mm/internal.h:435 [inline]
 lru_add+0x89/0x440 mm/swap.c:136
 folio_batch_move_lru+0x15f/0x230 mm/swap.c:168
 lru_add_drain_cpu+0x7c/0x260 mm/swap.c:616
 lru_add_drain mm/swap.c:698 [inline]
 __folio_batch_release+0x51/0xc0 mm/swap.c:1019
 folio_batch_release include/linux/pagevec.h:101 [inline]
 shmem_undo_range+0x35b/0xa70 mm/shmem.c:1040
 shmem_truncate_range mm/shmem.c:1152 [inline]
 shmem_evict_inode+0x14d/0x530 mm/shmem.c:1280
 evict+0x2f0/0x570 fs/inode.c:796
 iput_final fs/inode.c:1946 [inline]
 iput+0x42a/0x5b0 fs/inode.c:1972
 dentry_unlink_inode+0x24f/0x260 fs/dcache.c:422
 __dentry_kill+0x18b/0x4c0 fs/dcache.c:625
 dput+0x5c/0xd0 fs/dcache.c:867
 do_renameat2+0x748/0xa70 fs/namei.c:5226
 __do_sys_rename fs/namei.c:5271 [inline]
 __se_sys_rename fs/namei.c:5269 [inline]
 __x64_sys_rename+0x58/0x70 fs/namei.c:5269
 x64_sys_call+0x2b1c/0x2dc0 arch/x86/include/generated/asm/syscalls_64.h:83
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xc9/0x1c0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0xffff8881004c1198 -> 0x0000000000000000

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 UID: 0 PID: 3593 Comm: udevd Not tainted 6.13.0-rc1-syzkaller-00337-g7503345ac5f5 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
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