syzbot

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BUG: KCSAN: data-race in __unmap_and_move / page_cache_delete

write to 0xffffea0004984418 of 8 bytes by task 4195 on cpu 0:
 page_cache_delete+0x33e/0x390 mm/filemap.c:143
 __filemap_remove_folio+0x3b/0xf0 mm/filemap.c:223
 invalidate_complete_folio2 mm/truncate.c:594 [inline]
 invalidate_inode_pages2_range+0x450/0x670 mm/truncate.c:682
 __iomap_dio_rw+0x6a6/0x1000 fs/iomap/direct-io.c:583
 iomap_dio_rw+0x3c/0x80 fs/iomap/direct-io.c:690
 ext4_dio_write_iter fs/ext4/file.c:566 [inline]
 ext4_file_write_iter+0xaa9/0x1210 fs/ext4/file.c:677
 do_iter_write+0x494/0x750 fs/read_write.c:855
 vfs_iter_write+0x4c/0x70 fs/read_write.c:896
 iter_file_splice_write+0x44a/0x7c0 fs/splice.c:686
 do_splice_from fs/splice.c:764 [inline]
 direct_splice_actor+0x80/0xa0 fs/splice.c:931
 splice_direct_to_actor+0x305/0x620 fs/splice.c:886
 do_splice_direct+0xfb/0x180 fs/splice.c:974
 do_sendfile+0x3bf/0x910 fs/read_write.c:1249
 __do_sys_sendfile64 fs/read_write.c:1317 [inline]
 __se_sys_sendfile64 fs/read_write.c:1303 [inline]
 __x64_sys_sendfile64+0x10c/0x150 fs/read_write.c:1303
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

read to 0xffffea0004984418 of 8 bytes by task 4202 on cpu 1:
 __PageMovable include/linux/page-flags.h:674 [inline]
 __unmap_and_move+0xae/0xbd0 mm/migrate.c:987
 unmap_and_move+0x120/0x900 mm/migrate.c:1162
 migrate_pages+0x29e/0x7b0 mm/migrate.c:1441
 do_mbind+0x79b/0x8b0 mm/mempolicy.c:1321
 kernel_mbind mm/mempolicy.c:1468 [inline]
 __do_sys_mbind mm/mempolicy.c:1546 [inline]
 __se_sys_mbind+0x13b/0x3f0 mm/mempolicy.c:1542
 __x64_sys_mbind+0x74/0x80 mm/mempolicy.c:1542
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

value changed: 0xffff888121565360 -> 0x0000000000000000

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 4202 Comm: syz-executor.4 Not tainted 6.0.0-rc2-syzkaller-00044-gdf0219d11b6f-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/22/2022
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