syzbot

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BUG: KCSAN: data-race in delete_from_page_cache_batch / folio_mapping

write to 0xffffea00058e1d58 of 8 bytes by task 20995 on cpu 1:
 page_cache_delete_batch mm/filemap.c:306 [inline]
 delete_from_page_cache_batch+0x2f6/0x6f0 mm/filemap.c:332
 truncate_inode_pages_range+0x1b8/0x690 mm/truncate.c:376
 truncate_inode_pages mm/truncate.c:456 [inline]
 truncate_inode_pages_final+0x55/0x60 mm/truncate.c:491
 ext4_evict_inode+0xb2/0xd80 fs/ext4/inode.c:190
 evict+0x2e0/0x550 fs/inode.c:810
 dispose_list fs/inode.c:852 [inline]
 evict_inodes+0x3c6/0x430 fs/inode.c:906
 generic_shutdown_super+0x6c/0x210 fs/super.c:627
 kill_block_super+0x2a/0x70 fs/super.c:1710
 ext4_kill_sb+0x42/0x80 fs/ext4/super.c:7393
 deactivate_locked_super+0x72/0x1c0 fs/super.c:473
 deactivate_super+0x97/0xa0 fs/super.c:506
 cleanup_mnt+0x269/0x2e0 fs/namespace.c:1431
 __cleanup_mnt+0x19/0x20 fs/namespace.c:1438
 task_work_run+0x12e/0x1a0 kernel/task_work.c:227
 resume_user_mode_work+0x6a/0x70 include/linux/resume_user_mode.h:50
 exit_to_user_mode_loop kernel/entry/common.c:114 [inline]
 exit_to_user_mode_prepare include/linux/entry-common.h:329 [inline]
 __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
 syscall_exit_to_user_mode+0x77/0xb0 kernel/entry/common.c:218
 do_syscall_64+0xdd/0x1a0 arch/x86/entry/syscall_64.c:100
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffffea00058e1d58 of 8 bytes by task 21598 on cpu 0:
 folio_mapping+0xa1/0x120 mm/util.c:701
 folio_evictable mm/internal.h:480 [inline]
 lru_add+0x80/0x430 mm/swap.c:136
 folio_batch_move_lru+0x174/0x230 mm/swap.c:168
 lru_add_drain_cpu+0x77/0x250 mm/swap.c:642
 lru_add_drain+0x25/0x70 mm/swap.c:730
 populate_vma_page_range mm/gup.c:1931 [inline]
 __mm_populate+0x24b/0x3a0 mm/gup.c:2032
 mm_populate include/linux/mm.h:3487 [inline]
 vm_mmap_pgoff+0x232/0x2e0 mm/util.c:584
 ksys_mmap_pgoff+0x268/0x310 mm/mmap.c:607
 x64_sys_call+0x1602/0x2fb0 arch/x86/include/generated/asm/syscalls_64.h:10
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xd0/0x1a0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0xffff8881072198c8 -> 0x0000000000000000

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 21598 Comm: syz.0.6281 Not tainted 6.15.0-rc5-syzkaller-00275-gbec6f00f120e #0 PREEMPT(voluntary) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/19/2025
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