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KCSAN: data-race in __filemap_add_folio / kiocb_invalidate_post_direct_write (4)

Status: moderation: reported on 2024/06/23 17:37
Subsystems: fs mm
[Documentation on labels]
Reported-by: syzbot+345825cd2023c1bfe16f@syzkaller.appspotmail.com
First crash: 26d, last: 26d
Similar bugs (3)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream KCSAN: data-race in __filemap_add_folio / kiocb_invalidate_post_direct_write (2) fs mm 4 213d 222d 0/27 auto-obsoleted due to no activity on 2024/01/23 17:15
upstream KCSAN: data-race in __filemap_add_folio / kiocb_invalidate_post_direct_write (3) fs mm 3 145d 161d 0/27 auto-obsoleted due to no activity on 2024/03/31 09:05
upstream KCSAN: data-race in __filemap_add_folio / kiocb_invalidate_post_direct_write fs mm 7 295d 342d 0/27 auto-obsoleted due to no activity on 2023/11/01 22:02

Sample crash report:
==================================================================
BUG: KCSAN: data-race in __filemap_add_folio / kiocb_invalidate_post_direct_write

read-write to 0xffff888107cf2c08 of 8 bytes by task 28351 on cpu 1:
 __filemap_add_folio+0x439/0x710 mm/filemap.c:918
 filemap_add_folio+0x9c/0x1b0 mm/filemap.c:970
 page_cache_ra_unbounded+0x148/0x2e0 mm/readahead.c:252
 do_page_cache_ra mm/readahead.c:303 [inline]
 page_cache_ra_order mm/readahead.c:547 [inline]
 ondemand_readahead+0x542/0x6b0 mm/readahead.c:669
 page_cache_sync_ra+0xe0/0xf0 mm/readahead.c:696
 page_cache_sync_readahead include/linux/pagemap.h:1306 [inline]
 filemap_get_pages+0x252/0xfb0 mm/filemap.c:2529
 filemap_splice_read+0x360/0x920 mm/filemap.c:2894
 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+0x3ab/0x960 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+0x2c9f/0x2d70 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 0xffff888107cf2c08 of 8 bytes by task 28355 on cpu 0:
 kiocb_invalidate_post_direct_write+0x5e/0x1b0 mm/filemap.c:3915
 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
 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+0x3ab/0x960 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+0x2c9f/0x2d70 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: 0x0000000000000263 -> 0x0000000000000266

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 28355 Comm: syz-executor.1 Tainted: G        W          6.10.0-rc4-syzkaller-00330-g7c16f0a4ed1c #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024
==================================================================

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2024/06/23 17:37 upstream 7c16f0a4ed1c edc5149a .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __filemap_add_folio / kiocb_invalidate_post_direct_write
* Struck through repros no longer work on HEAD.