syzbot


KCSAN: data-race in filemap_fdatawrite_wbc / xas_set_mark

Status: moderation: reported on 2022/05/10 00:10
Subsystems: fs mm
[Documentation on labels]
Reported-by: syzbot+b97e9f65a69e70c39b6f@syzkaller.appspotmail.com
First crash: 544d, last: 1h07m

Sample crash report:
==================================================================
BUG: KCSAN: data-race in filemap_fdatawrite_wbc / xas_set_mark

write to 0xffff8881004a1a5c of 4 bytes by task 4629 on cpu 0:
 xa_mark_set lib/xarray.c:71 [inline]
 xas_set_mark+0x131/0x140 lib/xarray.c:892
 tag_pages_for_writeback+0xaa/0x2a0 mm/page-writeback.c:2350
 write_cache_pages+0x1ad/0x740 mm/page-writeback.c:2420
 mpage_writepages+0x72/0xe0 fs/mpage.c:679
 fat_writepages+0x24/0x30 fs/fat/inode.c:200
 do_writepages+0x1c2/0x340 mm/page-writeback.c:2553
 filemap_fdatawrite_wbc+0xdb/0xf0 mm/filemap.c:390
 __filemap_fdatawrite_range mm/filemap.c:423 [inline]
 filemap_write_and_wait_range+0xe0/0x210 mm/filemap.c:678
 kiocb_invalidate_pages+0x87/0x1e0 mm/filemap.c:2753
 generic_file_direct_write+0x58/0x1f0 mm/filemap.c:3887
 __generic_file_write_iter+0xae/0x120 mm/filemap.c:4050
 generic_file_write_iter+0x7d/0x1c0 mm/filemap.c:4090
 do_iter_write+0x4b4/0x7b0 fs/read_write.c:860
 vfs_iter_write+0x56/0x70 fs/read_write.c:901
 iter_file_splice_write+0x462/0x7e0 fs/splice.c:736
 do_splice_from fs/splice.c:933 [inline]
 direct_splice_actor+0x8a/0xb0 fs/splice.c:1142
 splice_direct_to_actor+0x31d/0x690 fs/splice.c:1088
 do_splice_direct+0x10d/0x190 fs/splice.c:1194
 do_sendfile+0x3b6/0x9a0 fs/read_write.c:1254
 __do_sys_sendfile64 fs/read_write.c:1322 [inline]
 __se_sys_sendfile64 fs/read_write.c:1308 [inline]
 __x64_sys_sendfile64+0x110/0x150 fs/read_write.c:1308
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

read to 0xffff8881004a1a5c of 4 bytes by task 4621 on cpu 1:
 xa_marked include/linux/xarray.h:420 [inline]
 mapping_tagged include/linux/fs.h:507 [inline]
 filemap_fdatawrite_wbc+0x5c/0xf0 mm/filemap.c:386
 __filemap_fdatawrite_range mm/filemap.c:423 [inline]
 file_write_and_wait_range+0xf4/0x190 mm/filemap.c:781
 __generic_file_fsync+0x4c/0x140 fs/libfs.c:1394
 fat_file_fsync+0x4c/0x100 fs/fat/file.c:191
 vfs_fsync_range+0x111/0x120 fs/sync.c:188
 generic_write_sync include/linux/fs.h:2584 [inline]
 generic_file_write_iter+0x191/0x1c0 mm/filemap.c:4094
 do_iter_write+0x4b4/0x7b0 fs/read_write.c:860
 vfs_iter_write+0x56/0x70 fs/read_write.c:901
 iter_file_splice_write+0x462/0x7e0 fs/splice.c:736
 do_splice_from fs/splice.c:933 [inline]
 direct_splice_actor+0x8a/0xb0 fs/splice.c:1142
 splice_direct_to_actor+0x31d/0x690 fs/splice.c:1088
 do_splice_direct+0x10d/0x190 fs/splice.c:1194
 do_sendfile+0x3b6/0x9a0 fs/read_write.c:1254
 __do_sys_sendfile64 fs/read_write.c:1316 [inline]
 __se_sys_sendfile64 fs/read_write.c:1308 [inline]
 __x64_sys_sendfile64+0xbd/0x150 fs/read_write.c:1308
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

value changed: 0x04000021 -> 0x08000021

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 4621 Comm: syz-executor.0 Not tainted 6.6.0-rc4-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/06/2023
==================================================================

Crashes (544):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2023/10/02 11:41 upstream 8a749fd1a872 8e26a358 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in filemap_fdatawrite_wbc / xas_set_mark
2023/10/01 08:12 upstream 3b517966c561 8e26a358 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in filemap_fdatawrite_wbc / xas_set_mark
2023/09/30 14:50 upstream 9f3ebbef746f 8e26a358 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in filemap_fdatawrite_wbc / xas_set_mark
2023/09/27 08:31 upstream 0e945134b680 0b6a67ac .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in filemap_fdatawrite_wbc / xas_set_mark
2023/09/26 22:30 upstream 50768a425b46 0b6a67ac .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in filemap_fdatawrite_wbc / xas_set_mark
2023/09/25 20:56 upstream 6465e260f487 0b6a67ac .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in filemap_fdatawrite_wbc / xas_set_mark
2023/09/24 04:13 upstream 3aba70aed91f 0b6a67ac .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in filemap_fdatawrite_wbc / xas_set_mark
2023/09/23 08:35 upstream 8018e02a8703 0b6a67ac .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in filemap_fdatawrite_wbc / xas_set_mark
2023/09/21 06:52 upstream 42dc814987c1 0b6a67ac .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in filemap_fdatawrite_wbc / xas_set_mark
2023/09/19 01:07 upstream 2cf0f7156238 0b6a67ac .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in filemap_fdatawrite_wbc / xas_set_mark
2023/09/18 03:02 upstream ce9ecca0238b 0b6a67ac .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in filemap_fdatawrite_wbc / xas_set_mark
2023/09/16 01:24 upstream e42bebf6db29 0b6a67ac .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in filemap_fdatawrite_wbc / xas_set_mark
2023/09/15 18:50 upstream 9fdfb15a3dbf 0b6a67ac .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in filemap_fdatawrite_wbc / xas_set_mark
2023/09/14 20:44 upstream aed8aee11130 0b6a67ac .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in filemap_fdatawrite_wbc / xas_set_mark
2023/09/12 17:37 upstream a747acc0b752 59da8366 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in filemap_fdatawrite_wbc / xas_set_mark
2023/09/11 20:51 upstream 0bb80ecc33a8 59da8366 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in filemap_fdatawrite_wbc / xas_set_mark
2023/09/11 06:49 upstream 1548b060d6f3 6654cf89 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in filemap_fdatawrite_wbc / xas_set_mark
2023/09/10 06:49 upstream 535a265d7f0d 6654cf89 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in filemap_fdatawrite_wbc / xas_set_mark
2023/09/08 19:35 upstream a48fa7efaf11 6654cf89 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in filemap_fdatawrite_wbc / xas_set_mark
2023/09/07 23:41 upstream 4a0fc73da97e 72324844 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in filemap_fdatawrite_wbc / xas_set_mark
2023/09/05 15:40 upstream 3f86ed6ec0b3 0b6286dc .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in filemap_fdatawrite_wbc / xas_set_mark
2023/09/04 20:37 upstream 708283abf896 db3306a6 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in filemap_fdatawrite_wbc / xas_set_mark
2023/09/03 06:19 upstream 92901222f83d 696ea0d2 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in filemap_fdatawrite_wbc / xas_set_mark
2023/09/01 08:36 upstream 99d99825fc07 696ea0d2 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in filemap_fdatawrite_wbc / xas_set_mark
2023/08/31 23:32 upstream b97d64c72259 696ea0d2 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in filemap_fdatawrite_wbc / xas_set_mark
2023/08/31 08:26 upstream ef2a0b7cdbc5 84803932 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in filemap_fdatawrite_wbc / xas_set_mark
2023/08/30 15:41 upstream 6c1b980a7e79 84803932 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in filemap_fdatawrite_wbc / xas_set_mark
2023/08/29 23:10 upstream f97e18a3f2fb ce731e62 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in filemap_fdatawrite_wbc / xas_set_mark
2023/08/29 17:41 upstream 1c59d383390f ce731e62 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in filemap_fdatawrite_wbc / xas_set_mark
2023/08/29 05:15 upstream 727dbda16b83 7ba13a15 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in filemap_fdatawrite_wbc / xas_set_mark
2023/08/28 09:59 upstream 2dde18cd1d8f 7ba13a15 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in filemap_fdatawrite_wbc / xas_set_mark
2023/08/28 01:52 upstream 2dde18cd1d8f 7ba13a15 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in filemap_fdatawrite_wbc / xas_set_mark
2023/08/27 20:06 upstream 28f20a19294d 7ba13a15 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in filemap_fdatawrite_wbc / xas_set_mark
2023/08/26 21:23 upstream 3b35375f19fe 7ba13a15 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in filemap_fdatawrite_wbc / xas_set_mark
2023/08/26 18:53 upstream 382d4cd18475 7ba13a15 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in filemap_fdatawrite_wbc / xas_set_mark
2023/08/26 00:24 upstream 382d4cd18475 03d9c195 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in filemap_fdatawrite_wbc / xas_set_mark
2023/08/25 07:00 upstream 4f9e7fabf864 49be837e .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in filemap_fdatawrite_wbc / xas_set_mark
2023/08/25 04:28 upstream 93f5de5f648d 49be837e .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in filemap_fdatawrite_wbc / xas_set_mark
2023/08/24 14:50 upstream a5e505a99ca7 4d7ae7ab .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in filemap_fdatawrite_wbc / xas_set_mark
2023/08/23 10:31 upstream 89bf6209cad6 b81ca3f6 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in filemap_fdatawrite_wbc / xas_set_mark
2023/08/22 13:19 upstream f7757129e3de b81ca3f6 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in filemap_fdatawrite_wbc / xas_set_mark
2023/08/20 16:34 upstream 706a74159504 d216d8a0 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in filemap_fdatawrite_wbc / xas_set_mark
2023/08/20 09:06 upstream 9e6c269de404 d216d8a0 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in filemap_fdatawrite_wbc / xas_set_mark
2023/08/20 00:13 upstream aa9ea98cca3a d216d8a0 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in filemap_fdatawrite_wbc / xas_set_mark
2023/08/19 00:11 upstream d4ddefee5160 d216d8a0 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in filemap_fdatawrite_wbc / xas_set_mark
2022/05/09 16:32 upstream 9be9ed2612b5 8b277b8e .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in filemap_fdatawrite_wbc / xas_set_mark
2022/05/08 12:25 upstream 30c8e80f7932 e60b1103 .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in filemap_fdatawrite_wbc / xas_set_mark
2022/04/06 11:04 upstream 3e732ebf7316 86b4b7f8 .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in filemap_fdatawrite_wbc / xas_set_mark
* Struck through repros no longer work on HEAD.