================================================================== BUG: KCSAN: data-race in __xa_set_mark / xas_find_marked write to 0xffff8881066bbe14 of 4 bytes by task 16324 on cpu 1: xa_mark_set lib/xarray.c:71 [inline] xas_set_mark lib/xarray.c:899 [inline] __xa_set_mark+0x182/0x1b0 lib/xarray.c:1943 __folio_mark_dirty+0x3b5/0x4e0 mm/page-writeback.c:2798 mark_buffer_dirty+0x134/0x230 fs/buffer.c:1196 __block_commit_write fs/buffer.c:2189 [inline] block_write_end+0x123/0x210 fs/buffer.c:2265 generic_write_end+0x5c/0x160 fs/buffer.c:2279 fat_write_end+0x4e/0x160 fs/fat/inode.c:242 generic_perform_write+0x33c/0x4a0 mm/filemap.c:4204 __generic_file_write_iter+0xa1/0x120 mm/filemap.c:4290 generic_file_write_iter+0x8f/0x310 mm/filemap.c:4316 iter_file_splice_write+0x5f1/0x980 fs/splice.c:743 do_splice_from fs/splice.c:941 [inline] direct_splice_actor+0x160/0x2c0 fs/splice.c:1164 splice_direct_to_actor+0x302/0x670 fs/splice.c:1108 do_splice_direct_actor fs/splice.c:1207 [inline] do_splice_direct+0xd7/0x150 fs/splice.c:1233 do_sendfile+0x398/0x660 fs/read_write.c:1363 __do_sys_sendfile64 fs/read_write.c:1424 [inline] __se_sys_sendfile64 fs/read_write.c:1410 [inline] __x64_sys_sendfile64+0x110/0x150 fs/read_write.c:1410 x64_sys_call+0xfbd/0x2dc0 arch/x86/include/generated/asm/syscalls_64.h:41 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 0xffff8881066bbe14 of 4 bytes by task 16330 on cpu 0: xa_marked include/linux/xarray.h:424 [inline] xas_find_marked+0x608/0x650 lib/xarray.c:1350 find_get_entry+0x54/0x390 mm/filemap.c:2017 filemap_get_folios_tag+0x9e/0x210 mm/filemap.c:2284 __filemap_fdatawait_range mm/filemap.c:533 [inline] file_write_and_wait_range+0x204/0x2f0 mm/filemap.c:801 __generic_file_fsync+0x46/0x140 fs/libfs.c:1525 fat_file_fsync+0x46/0x100 fs/fat/file.c:191 vfs_fsync_range+0x116/0x130 fs/sync.c:187 generic_write_sync include/linux/fs.h:2970 [inline] generic_file_write_iter+0x1c3/0x310 mm/filemap.c:4320 iter_file_splice_write+0x5f1/0x980 fs/splice.c:743 do_splice_from fs/splice.c:941 [inline] direct_splice_actor+0x160/0x2c0 fs/splice.c:1164 splice_direct_to_actor+0x302/0x670 fs/splice.c:1108 do_splice_direct_actor fs/splice.c:1207 [inline] do_splice_direct+0xd7/0x150 fs/splice.c:1233 do_sendfile+0x398/0x660 fs/read_write.c:1363 __do_sys_sendfile64 fs/read_write.c:1424 [inline] __se_sys_sendfile64 fs/read_write.c:1410 [inline] __x64_sys_sendfile64+0x110/0x150 fs/read_write.c:1410 x64_sys_call+0xfbd/0x2dc0 arch/x86/include/generated/asm/syscalls_64.h:41 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: 0x04000021 -> 0x0e000021 Reported by Kernel Concurrency Sanitizer on: CPU: 0 UID: 0 PID: 16330 Comm: syz.2.4452 Not tainted 6.14.0-rc2-syzkaller-00281-g496659003dac #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024 ================================================================== ================================================================== BUG: KCSAN: data-race in xas_find_marked / xas_set_mark write to 0xffff8881066bbe14 of 4 bytes by task 16324 on cpu 0: xa_mark_set lib/xarray.c:71 [inline] xas_set_mark+0x131/0x150 lib/xarray.c:899 __folio_start_writeback+0x1e8/0x430 mm/page-writeback.c:3126 __block_write_full_folio+0x506/0x8c0 fs/buffer.c:1899 block_write_full_folio+0x293/0x2b0 __mpage_writepage+0xcfe/0xe10 fs/mpage.c:639 write_cache_pages+0x62/0x100 mm/page-writeback.c:2644 mpage_writepages+0x72/0xf0 fs/mpage.c:666 fat_writepages+0x24/0x30 fs/fat/inode.c:199 do_writepages+0x1d8/0x480 mm/page-writeback.c:2687 filemap_fdatawrite_wbc mm/filemap.c:389 [inline] __filemap_fdatawrite_range mm/filemap.c:422 [inline] file_write_and_wait_range+0x168/0x2f0 mm/filemap.c:797 __generic_file_fsync+0x46/0x140 fs/libfs.c:1525 fat_file_fsync+0x46/0x100 fs/fat/file.c:191 vfs_fsync_range+0x116/0x130 fs/sync.c:187 generic_write_sync include/linux/fs.h:2970 [inline] generic_file_write_iter+0x1c3/0x310 mm/filemap.c:4320 iter_file_splice_write+0x5f1/0x980 fs/splice.c:743 do_splice_from fs/splice.c:941 [inline] direct_splice_actor+0x160/0x2c0 fs/splice.c:1164 splice_direct_to_actor+0x302/0x670 fs/splice.c:1108 do_splice_direct_actor fs/splice.c:1207 [inline] do_splice_direct+0xd7/0x150 fs/splice.c:1233 do_sendfile+0x398/0x660 fs/read_write.c:1363 __do_sys_sendfile64 fs/read_write.c:1424 [inline] __se_sys_sendfile64 fs/read_write.c:1410 [inline] __x64_sys_sendfile64+0x110/0x150 fs/read_write.c:1410 x64_sys_call+0xfbd/0x2dc0 arch/x86/include/generated/asm/syscalls_64.h:41 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 0xffff8881066bbe14 of 4 bytes by task 16330 on cpu 1: xa_marked include/linux/xarray.h:424 [inline] xas_find_marked+0x608/0x650 lib/xarray.c:1350 find_get_entry+0x54/0x390 mm/filemap.c:2017 filemap_get_folios_tag+0x9e/0x210 mm/filemap.c:2284 writeback_get_folio mm/page-writeback.c:2493 [inline] writeback_iter+0x4b0/0x830 mm/page-writeback.c:2594 write_cache_pages+0x4b/0x100 mm/page-writeback.c:2643 mpage_writepages+0x72/0xf0 fs/mpage.c:666 fat_writepages+0x24/0x30 fs/fat/inode.c:199 do_writepages+0x1d8/0x480 mm/page-writeback.c:2687 filemap_fdatawrite_wbc mm/filemap.c:389 [inline] __filemap_fdatawrite_range mm/filemap.c:422 [inline] file_write_and_wait_range+0x168/0x2f0 mm/filemap.c:797 __generic_file_fsync+0x46/0x140 fs/libfs.c:1525 fat_file_fsync+0x46/0x100 fs/fat/file.c:191 vfs_fsync_range+0x116/0x130 fs/sync.c:187 generic_write_sync include/linux/fs.h:2970 [inline] generic_file_write_iter+0x1c3/0x310 mm/filemap.c:4320 iter_file_splice_write+0x5f1/0x980 fs/splice.c:743 do_splice_from fs/splice.c:941 [inline] direct_splice_actor+0x160/0x2c0 fs/splice.c:1164 splice_direct_to_actor+0x302/0x670 fs/splice.c:1108 do_splice_direct_actor fs/splice.c:1207 [inline] do_splice_direct+0xd7/0x150 fs/splice.c:1233 do_sendfile+0x398/0x660 fs/read_write.c:1363 __do_sys_sendfile64 fs/read_write.c:1424 [inline] __se_sys_sendfile64 fs/read_write.c:1410 [inline] __x64_sys_sendfile64+0x110/0x150 fs/read_write.c:1410 x64_sys_call+0xfbd/0x2dc0 arch/x86/include/generated/asm/syscalls_64.h:41 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: 0x0a000021 -> 0x04000021 Reported by Kernel Concurrency Sanitizer on: CPU: 1 UID: 0 PID: 16330 Comm: syz.2.4452 Not tainted 6.14.0-rc2-syzkaller-00281-g496659003dac #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024 ==================================================================