syzbot

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BUG: KCSAN: data-race in __filemap_remove_folio / folio_mapping

write to 0xffffea0004600e58 of 8 bytes by task 16932 on cpu 1:
 page_cache_delete mm/filemap.c:152 [inline]
 __filemap_remove_folio+0x1ac/0x2c0 mm/filemap.c:232
 invalidate_complete_folio2 mm/truncate.c:575 [inline]
 invalidate_inode_pages2_range+0x3f8/0x720 mm/truncate.c:662
 kiocb_invalidate_post_direct_write+0x98/0x1b0 mm/filemap.c:3875
 iomap_dio_complete+0x33a/0x4c0 fs/iomap/direct-io.c:114
 iomap_dio_rw+0x62/0x90 fs/iomap/direct-io.c:753
 ext4_dio_write_iter fs/ext4/file.c:577 [inline]
 ext4_file_write_iter+0xaa4/0xe30 fs/ext4/file.c:696
 call_write_iter include/linux/fs.h:2110 [inline]
 iter_file_splice_write+0x5e6/0x970 fs/splice.c:743
 do_splice_from fs/splice.c:941 [inline]
 direct_splice_actor+0x16c/0x2c0 fs/splice.c:1164
 splice_direct_to_actor+0x305/0x670 fs/splice.c:1108
 do_splice_direct_actor fs/splice.c:1207 [inline]
 do_splice_direct+0xd7/0x150 fs/splice.c:1233
 do_sendfile+0x3b9/0x970 fs/read_write.c:1295
 __do_sys_sendfile64 fs/read_write.c:1362 [inline]
 __se_sys_sendfile64 fs/read_write.c:1348 [inline]
 __x64_sys_sendfile64+0x110/0x150 fs/read_write.c:1348
 x64_sys_call+0x2c67/0x2d30 arch/x86/include/generated/asm/syscalls_64.h:41
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x1d0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffffea0004600e58 of 8 bytes by task 16925 on cpu 0:
 folio_mapping+0x96/0x110 mm/util.c:799
 folio_evictable mm/internal.h:256 [inline]
 lru_add_fn+0x8d/0x430 mm/swap.c:197
 folio_batch_move_lru+0x20c/0x2c0 mm/swap.c:233
 lru_add_drain_cpu+0x77/0x260 mm/swap.c:667
 lru_add_drain mm/swap.c:767 [inline]
 __folio_batch_release+0x51/0xc0 mm/swap.c:1091
 folio_batch_release include/linux/pagevec.h:101 [inline]
 filemap_splice_read+0x7dc/0x920 mm/filemap.c:2921
 ext4_file_splice_read+0x95/0xc0 fs/ext4/file.c:158
 do_splice_read fs/splice.c:985 [inline]
 splice_direct_to_actor+0x26c/0x670 fs/splice.c:1089
 do_splice_direct_actor fs/splice.c:1207 [inline]
 do_splice_direct+0xd7/0x150 fs/splice.c:1233
 do_sendfile+0x3b9/0x970 fs/read_write.c:1295
 __do_sys_sendfile64 fs/read_write.c:1362 [inline]
 __se_sys_sendfile64 fs/read_write.c:1348 [inline]
 __x64_sys_sendfile64+0x110/0x150 fs/read_write.c:1348
 x64_sys_call+0x2c67/0x2d30 arch/x86/include/generated/asm/syscalls_64.h:41
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x1d0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0xffff8881081c42a0 -> 0x0000000000000000

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 16925 Comm: syz-executor.1 Not tainted 6.9.0-rc5-syzkaller-00042-ge88c4cfcb7b8 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
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