syzbot


KCSAN: data-race in __filemap_add_folio / kiocb_invalidate_post_direct_write (5)

Status: auto-obsoleted due to no activity on 2024/10/12 08:52
Subsystems: fs mm
[Documentation on labels]
Reported-by: syzbot+7fb8a8e00365232e6ef6@syzkaller.appspotmail.com
First crash: 77d, last: 58d
Similar bugs (4)
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 (4) mm fs 1 134d 134d 0/28 auto-obsoleted due to no activity on 2024/07/28 17:37
upstream KCSAN: data-race in __filemap_add_folio / kiocb_invalidate_post_direct_write (2) fs mm 4 321d 330d 0/28 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 253d 269d 0/28 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 404d 450d 0/28 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 0xffff88810561e960 of 8 bytes by task 15144 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
 page_cache_sync_ra+0x652/0x670
 page_cache_sync_readahead include/linux/pagemap.h:1296 [inline]
 filemap_get_pages+0x252/0xfb0 mm/filemap.c:2529
 filemap_splice_read+0x360/0x920 mm/filemap.c:2894
 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/0x950 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+0xed5/0x2d60 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 0xffff88810561e960 of 8 bytes by task 15145 on cpu 0:
 kiocb_invalidate_post_direct_write+0x5e/0x1b0 mm/filemap.c:3916
 dio_complete+0x221/0x490 fs/direct-io.c:301
 __blockdev_direct_IO+0x1cdd/0x1e90 fs/direct-io.c:1309
 blockdev_direct_IO include/linux/fs.h:3218 [inline]
 fat_direct_IO+0x110/0x1e0 fs/fat/inode.c:282
 generic_file_direct_write+0xaf/0x200 mm/filemap.c:3941
 __generic_file_write_iter+0xae/0x120 mm/filemap.c:4107
 generic_file_write_iter+0x7d/0x1d0 mm/filemap.c:4147
 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/0x950 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+0xed5/0x2d60 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: 0x0000000000000000 -> 0x0000000000000001

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 15145 Comm: syz.1.3424 Not tainted 6.11.0-rc6-syzkaller-00308-gb31c44928842 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024
==================================================================

Crashes (4):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2024/09/07 08:52 upstream b31c44928842 9750182a .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
2024/09/03 23:43 upstream 88fac17500f4 326f9c5a .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
2024/08/29 05:42 upstream 928f79a188aa ef3de9e8 .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
2024/08/19 20:28 upstream 47ac09b91bef 9f0ab3fb .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.