syzbot


KCSAN: data-race in xas_clear_mark / xas_find_marked (2)

Status: moderation: reported on 2019/12/10 21:55
Subsystems: fs mm
[Documentation on labels]
Reported-by: syzbot+6b653cb0a28eee8c400a@syzkaller.appspotmail.com
First crash: 1440d, last: 34m
Similar bugs (1)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream KCSAN: data-race in xas_clear_mark / xas_find_marked mm 3 1445d 1451d 0/25 closed as invalid on 2019/10/18 14:11

Sample crash report:
==================================================================
BUG: KCSAN: data-race in xas_clear_mark / xas_find_marked

read-write to 0xffff888126faf478 of 8 bytes by task 10533 on cpu 0:
 instrument_read_write include/linux/instrumented.h:55 [inline]
 __instrument_read_write_bitop include/asm-generic/bitops/instrumented-non-atomic.h:84 [inline]
 ___test_and_clear_bit include/asm-generic/bitops/instrumented-non-atomic.h:114 [inline]
 node_clear_mark lib/xarray.c:102 [inline]
 xas_clear_mark+0x8c/0x180 lib/xarray.c:914
 __folio_start_writeback+0x347/0x4b0 mm/page-writeback.c:3031
 ext4_bio_write_folio+0x592/0x9a0 fs/ext4/page-io.c:557
 mpage_submit_folio fs/ext4/inode.c:1865 [inline]
 mpage_map_and_submit_buffers fs/ext4/inode.c:2111 [inline]
 mpage_map_and_submit_extent fs/ext4/inode.c:2250 [inline]
 ext4_do_writepages+0x139f/0x2100 fs/ext4/inode.c:2675
 ext4_writepages+0x15e/0x2e0 fs/ext4/inode.c:2764
 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
 filemap_write_and_wait include/linux/pagemap.h:64 [inline]
 ext4_ioctl_setflags fs/ext4/ioctl.c:635 [inline]
 ext4_fileattr_set+0x57f/0xdd0 fs/ext4/ioctl.c:1012
 vfs_fileattr_set+0x596/0x5e0 fs/ioctl.c:697
 do_vfs_ioctl+0x10b2/0x13a0
 __do_sys_ioctl fs/ioctl.c:869 [inline]
 __se_sys_ioctl+0x81/0x140 fs/ioctl.c:857
 __x64_sys_ioctl+0x43/0x50 fs/ioctl.c:857
 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 0xffff888126faf478 of 8 bytes by task 10528 on cpu 1:
 xas_find_chunk include/linux/xarray.h:1723 [inline]
 xas_find_marked+0x216/0x660 lib/xarray.c:1354
 find_get_entry+0x5d/0x290 mm/filemap.c:1978
 filemap_get_folios_tag+0xa2/0x250 mm/filemap.c:2266
 mpage_prepare_extent_to_map+0x321/0xb70 fs/ext4/inode.c:2388
 ext4_do_writepages+0xa20/0x2100 fs/ext4/inode.c:2673
 ext4_writepages+0x15e/0x2e0 fs/ext4/inode.c:2764
 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]
 file_write_and_wait_range+0xf4/0x190 mm/filemap.c:781
 ext4_sync_file+0x133/0x6c0 fs/ext4/fsync.c:158
 vfs_fsync_range+0x111/0x120 fs/sync.c:188
 generic_write_sync include/linux/fs.h:2584 [inline]
 ext4_buffered_write_iter+0x334/0x370 fs/ext4/file.c:305
 ext4_file_write_iter+0xd6/0x1200
 call_write_iter include/linux/fs.h:1956 [inline]
 new_sync_write fs/read_write.c:491 [inline]
 vfs_write+0x4ab/0x7d0 fs/read_write.c:584
 ksys_write+0xeb/0x1a0 fs/read_write.c:637
 __do_sys_write fs/read_write.c:649 [inline]
 __se_sys_write fs/read_write.c:646 [inline]
 __x64_sys_write+0x42/0x50 fs/read_write.c:646
 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: 0xffffffffffffff80 -> 0xfffffffffffffe00

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 10528 Comm: syz-executor.5 Not tainted 6.6.0-rc4-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/06/2023
==================================================================
syz-executor.5 (10528) used greatest stack depth: 10272 bytes left

Crashes (2965):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2023/10/02 11:25 upstream 8a749fd1a872 8e26a358 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in xas_clear_mark / xas_find_marked
2023/10/01 22:07 upstream e81a2dabc3f3 8e26a358 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in xas_clear_mark / xas_find_marked
2023/10/01 08:44 upstream e402b08634b3 8e26a358 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in xas_clear_mark / xas_find_marked
2023/09/30 19:27 upstream 3b517966c561 8e26a358 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in xas_clear_mark / xas_find_marked
2023/09/30 06:23 upstream 9f3ebbef746f 8e26a358 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in xas_clear_mark / xas_find_marked
2023/09/29 17:20 upstream 71e58659bfc0 8e26a358 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in xas_clear_mark / xas_find_marked
2023/09/29 14:53 upstream 9ed22ae6be81 8e26a358 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in xas_clear_mark / xas_find_marked
2023/09/28 19:32 upstream 9ed22ae6be81 d265efd8 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in xas_clear_mark / xas_find_marked
2023/09/28 15:55 upstream 633b47cb009d d265efd8 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in xas_clear_mark / xas_find_marked
2023/09/28 03:24 upstream 633b47cb009d c2ab1e5d .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in xas_clear_mark / xas_find_marked
2023/09/28 01:58 upstream 633b47cb009d 2895a507 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in xas_clear_mark / xas_find_marked
2023/09/27 12:39 upstream 0e945134b680 2895a507 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in xas_clear_mark / xas_find_marked
2023/09/27 05:57 upstream 0e945134b680 0b6a67ac .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in xas_clear_mark / xas_find_marked
2023/09/26 17:06 upstream 50768a425b46 0b6a67ac .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in xas_clear_mark / xas_find_marked
2023/09/25 11:10 upstream 6465e260f487 0b6a67ac .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in xas_clear_mark / xas_find_marked
2023/09/24 22:03 upstream 8a511e7efc5a 0b6a67ac .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in xas_clear_mark / xas_find_marked
2023/09/24 00:18 upstream 3aba70aed91f 0b6a67ac .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in xas_clear_mark / xas_find_marked
2023/09/23 11:06 upstream d90b0276af8f 0b6a67ac .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in xas_clear_mark / xas_find_marked
2023/09/22 21:46 upstream 8018e02a8703 0b6a67ac .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in xas_clear_mark / xas_find_marked
2023/09/22 08:41 upstream 27bbf45eae9c 0b6a67ac .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in xas_clear_mark / xas_find_marked
2023/09/21 19:24 upstream b5cbe7c00aa0 0b6a67ac .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in xas_clear_mark / xas_find_marked
2023/09/21 06:23 upstream 42dc814987c1 0b6a67ac .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in xas_clear_mark / xas_find_marked
2023/09/20 17:19 upstream 5d2f53532ecc 0b6a67ac .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in xas_clear_mark / xas_find_marked
2023/09/18 21:11 upstream 2cf0f7156238 0b6a67ac .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in xas_clear_mark / xas_find_marked
2023/09/18 01:10 upstream ce9ecca0238b 0b6a67ac .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in xas_clear_mark / xas_find_marked
2023/09/17 12:05 upstream f0b0d403eabb 0b6a67ac .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in xas_clear_mark / xas_find_marked
2023/09/16 22:48 upstream ad8a69f361b9 0b6a67ac .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in xas_clear_mark / xas_find_marked
2023/09/16 09:30 upstream 57d88e8a5974 0b6a67ac .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in xas_clear_mark / xas_find_marked
2023/09/16 09:25 upstream 57d88e8a5974 0b6a67ac .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in xas_clear_mark / xas_find_marked
2023/09/15 20:13 upstream e42bebf6db29 0b6a67ac .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in xas_clear_mark / xas_find_marked
2023/09/15 00:20 upstream 9fdfb15a3dbf 0b6a67ac .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in xas_clear_mark / xas_find_marked
2023/09/14 11:19 upstream aed8aee11130 0b6a67ac .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in xas_clear_mark / xas_find_marked
2023/09/13 21:50 upstream 23f108dc9ed2 0b6a67ac .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in xas_clear_mark / xas_find_marked
2023/09/13 08:43 upstream 3669558bdf35 0b6a67ac .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in xas_clear_mark / xas_find_marked
2023/09/13 06:53 upstream 3669558bdf35 59da8366 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in xas_clear_mark / xas_find_marked
2023/09/12 17:20 upstream a747acc0b752 59da8366 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in xas_clear_mark / xas_find_marked
2023/09/11 11:11 upstream 0bb80ecc33a8 59da8366 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in xas_clear_mark / xas_find_marked
2023/09/11 09:41 upstream 0bb80ecc33a8 6654cf89 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in xas_clear_mark / xas_find_marked
2023/09/10 20:22 upstream 1548b060d6f3 6654cf89 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in xas_clear_mark / xas_find_marked
2023/09/10 20:00 upstream 1548b060d6f3 6654cf89 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in xas_clear_mark / xas_find_marked
2023/09/10 06:40 upstream 535a265d7f0d 6654cf89 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in xas_clear_mark / xas_find_marked
2023/09/09 17:31 upstream 6099776f9f26 6654cf89 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in xas_clear_mark / xas_find_marked
2023/09/09 03:44 upstream 32bf43e4efdb 6654cf89 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in xas_clear_mark / xas_find_marked
2021/01/17 10:22 upstream 0da0a8a0a0e1 813be542 .config console log report info ci2-upstream-kcsan-gce
2019/10/22 14:09 https://github.com/google/ktsan.git kcsan 05f2236801fe 4ee855e7 .config console log report ci2-upstream-kcsan-gce
* Struck through repros no longer work on HEAD.