syzbot


KCSAN: data-race in mark_buffer_dirty_inode / sync_mapping_buffers
Status: auto-closed as invalid on 2020/04/08 22:27
Reported-by: syzbot+@syzkaller.appspotmail.com
First crash: 917d, last: 848d
similar bugs (4):
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream KCSAN: data-race in mark_buffer_dirty_inode / sync_mapping_buffers (4) 5 524d 536d 0/22 auto-closed as invalid on 2021/01/23 11:44
upstream KCSAN: data-race in mark_buffer_dirty_inode / sync_mapping_buffers (3) 10 609d 701d 0/22 auto-closed as invalid on 2020/10/29 18:32
upstream KCSAN: data-race in mark_buffer_dirty_inode / sync_mapping_buffers (2) 1 739d 739d 0/22 closed as invalid on 2020/06/18 14:13
upstream KCSAN: data-race in mark_buffer_dirty_inode / sync_mapping_buffers (5) 32 214d 441d 0/22 auto-closed as invalid on 2021/11/29 11:14

Sample crash report:
==================================================================
BUG: KCSAN: data-race in mark_buffer_dirty_inode / sync_mapping_buffers

read to 0xffff88812534ea18 of 8 bytes by task 15980 on cpu 1:
 mark_buffer_dirty_inode+0xa1/0x260 fs/buffer.c:596
 fat16_ent_put+0x82/0x90 fs/fat/fatent.c:182
 fat_alloc_clusters+0x507/0xc40 fs/fat/fatent.c:501
 fat_add_cluster+0x3d/0xd0 fs/fat/inode.c:107
 fat_fallocate+0x152/0x1f0 fs/fat/file.c:291
 vfs_fallocate+0x3be/0x650 fs/open.c:309
 ioctl_preallocate+0x12b/0x190 fs/ioctl.c:491
 file_ioctl fs/ioctl.c:537 [inline]
 do_vfs_ioctl+0xb14/0xcf0 fs/ioctl.c:732
 ksys_ioctl+0xbd/0xe0 fs/ioctl.c:749
 __do_sys_ioctl fs/ioctl.c:756 [inline]
 __se_sys_ioctl fs/ioctl.c:754 [inline]
 __x64_sys_ioctl+0x4c/0x60 fs/ioctl.c:754
 do_syscall_64+0xcc/0x3a0 arch/x86/entry/common.c:294
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

write to 0xffff88812534ea18 of 8 bytes by task 15989 on cpu 0:
 fsync_buffers_list fs/buffer.c:774 [inline]
 sync_mapping_buffers+0x4eb/0x6e0 fs/buffer.c:563
 fat_file_fsync+0xd4/0x120 fs/fat/file.c:194
 vfs_fsync_range+0x82/0x150 fs/sync.c:197
 generic_write_sync include/linux/fs.h:2856 [inline]
 generic_file_write_iter+0x318/0x38c mm/filemap.c:3474
 call_write_iter include/linux/fs.h:1902 [inline]
 do_iter_readv_writev+0x487/0x5b0 fs/read_write.c:693
 do_iter_write fs/read_write.c:970 [inline]
 do_iter_write+0x13b/0x3c0 fs/read_write.c:951
 vfs_iter_write+0x5c/0x80 fs/read_write.c:983
 iter_file_splice_write+0x530/0x840 fs/splice.c:760
 do_splice_from fs/splice.c:863 [inline]
 direct_splice_actor+0xa0/0xc0 fs/splice.c:1037
 splice_direct_to_actor+0x22b/0x540 fs/splice.c:992
 do_splice_direct+0x161/0x1e0 fs/splice.c:1080
 do_sendfile+0x384/0x7f0 fs/read_write.c:1464
 __do_sys_sendfile64 fs/read_write.c:1525 [inline]
 __se_sys_sendfile64 fs/read_write.c:1511 [inline]
 __x64_sys_sendfile64+0x12a/0x140 fs/read_write.c:1511
 do_syscall_64+0xcc/0x3a0 arch/x86/entry/common.c:294
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 15989 Comm: syz-executor.1 Not tainted 5.5.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================

Crashes (8):
Manager Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Title
ci2-upstream-kcsan-gce 2020/01/29 22:24 https://github.com/google/ktsan.git kcsan 245a43005292 5ed23f9a .config log report
ci2-upstream-kcsan-gce 2020/01/28 05:27 https://github.com/google/ktsan.git kcsan 245a43005292 56cd6c9b .config log report
ci2-upstream-kcsan-gce 2020/01/27 08:57 https://github.com/google/ktsan.git kcsan 245a43005292 dd56146d .config log report
ci2-upstream-kcsan-gce 2020/01/26 13:24 https://github.com/google/ktsan.git kcsan 245a43005292 f4e7270e .config log report
ci2-upstream-kcsan-gce 2020/01/22 22:07 https://github.com/google/ktsan.git kcsan 245a43005292 3334d684 .config log report
ci2-upstream-kcsan-gce 2020/01/17 01:09 https://github.com/google/ktsan.git kcsan 245a43005292 3de7aabb .config log report
ci2-upstream-kcsan-gce 2019/12/02 06:45 https://github.com/google/ktsan.git kcsan ef798c30ba4e f879db37 .config log report
ci2-upstream-kcsan-gce 2019/11/21 16:51 https://github.com/google/ktsan.git kcsan 5863cc791e4c 8098ea0f .config log report