syzbot


KCSAN: data-race in __mark_inode_dirty / vfs_fsync_range (5)

Status: auto-closed as invalid on 2021/05/14 12:10
Reported-by: syzbot+@syzkaller.appspotmail.com
First crash: 542d, last: 496d
similar bugs (5):
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream KCSAN: data-race in __mark_inode_dirty / vfs_fsync_range (6) 1 438d 438d 0/23 auto-closed as invalid on 2021/07/10 17:50
upstream KCSAN: data-race in __mark_inode_dirty / vfs_fsync_range (4) 6 597d 619d 0/23 auto-closed as invalid on 2021/02/02 16:23
upstream KCSAN: data-race in __mark_inode_dirty / vfs_fsync_range (2) 1 791d 791d 0/23 closed as invalid on 2020/06/18 14:13
upstream KCSAN: data-race in __mark_inode_dirty / vfs_fsync_range (3) 1 757d 757d 0/23 auto-closed as invalid on 2020/08/25 18:47
upstream KCSAN: data-race in __mark_inode_dirty / vfs_fsync_range 2 1028d 1029d 0/23 closed as invalid on 2019/11/19 13:44

Sample crash report:
==================================================================
BUG: KCSAN: data-race in __mark_inode_dirty / vfs_fsync_range

write to 0xffff88800a1907b8 of 8 bytes by task 15363 on cpu 1:
 __mark_inode_dirty+0x222/0x6f0 fs/fs-writeback.c:2312
 mark_inode_dirty include/linux/fs.h:2267 [inline]
 dquot_alloc_space include/linux/quotaops.h:317 [inline]
 dquot_alloc_block include/linux/quotaops.h:334 [inline]
 ext4_mb_new_blocks+0xca0/0x1150 fs/ext4/mballoc.c:4944
 ext4_ext_map_blocks+0x146f/0x1fd0 fs/ext4/extents.c:4238
 ext4_map_blocks+0x726/0xff0 fs/ext4/inode.c:638
 ext4_iomap_alloc fs/ext4/inode.c:3428 [inline]
 ext4_iomap_begin+0x513/0x6a0 fs/ext4/inode.c:3478
 iomap_apply+0x8d/0x4a0 fs/iomap/apply.c:46
 __iomap_dio_rw+0x4c4/0xa30 fs/iomap/direct-io.c:553
 iomap_dio_rw+0x30/0x70 fs/iomap/direct-io.c:641
 ext4_dio_write_iter fs/ext4/file.c:551 [inline]
 ext4_file_write_iter+0xe5d/0x10b0 fs/ext4/file.c:661
 call_write_iter include/linux/fs.h:1977 [inline]
 do_iter_readv_writev+0x2cb/0x360 fs/read_write.c:740
 do_iter_write+0x112/0x4c0 fs/read_write.c:866
 vfs_iter_write+0x4c/0x70 fs/read_write.c:907
 iter_file_splice_write+0x40a/0x750 fs/splice.c:689
 do_splice_from fs/splice.c:767 [inline]
 direct_splice_actor+0x80/0xa0 fs/splice.c:936
 splice_direct_to_actor+0x345/0x650 fs/splice.c:891
 do_splice_direct+0xf5/0x170 fs/splice.c:979
 do_sendfile+0x7a6/0xe20 fs/read_write.c:1260
 __do_sys_sendfile64 fs/read_write.c:1325 [inline]
 __se_sys_sendfile64 fs/read_write.c:1311 [inline]
 __x64_sys_sendfile64+0xf2/0x130 fs/read_write.c:1311
 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffff88800a1907b8 of 8 bytes by task 15371 on cpu 0:
 vfs_fsync_range+0x98/0x120 fs/sync.c:198
 generic_write_sync include/linux/fs.h:2843 [inline]
 ext4_buffered_write_iter+0x38f/0x3e0 fs/ext4/file.c:277
 ext4_file_write_iter+0x48a/0x10b0 fs/ext4/file.c:502
 call_write_iter include/linux/fs.h:1977 [inline]
 do_iter_readv_writev+0x2cb/0x360 fs/read_write.c:740
 do_iter_write+0x112/0x4c0 fs/read_write.c:866
 vfs_iter_write+0x4c/0x70 fs/read_write.c:907
 iter_file_splice_write+0x40a/0x750 fs/splice.c:689
 do_splice_from fs/splice.c:767 [inline]
 direct_splice_actor+0x80/0xa0 fs/splice.c:936
 splice_direct_to_actor+0x345/0x650 fs/splice.c:891
 do_splice_direct+0xf5/0x170 fs/splice.c:979
 do_sendfile+0x7a6/0xe20 fs/read_write.c:1260
 __do_sys_sendfile64 fs/read_write.c:1319 [inline]
 __se_sys_sendfile64 fs/read_write.c:1311 [inline]
 __x64_sys_sendfile64+0xa9/0x130 fs/read_write.c:1311
 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xae

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 15371 Comm: syz-executor.5 Tainted: G        W         5.12.0-rc6-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================

Crashes (5):
Manager Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Title
ci2-upstream-kcsan-gce 2021/04/09 12:08 upstream 17e7124aad76 6a81331a .config log report info KCSAN: data-race in __mark_inode_dirty / vfs_fsync_range
ci2-upstream-kcsan-gce 2021/03/23 19:14 upstream 7acac4b3196c e613994b .config log report info KCSAN: data-race in __mark_inode_dirty / vfs_fsync_range
ci2-upstream-kcsan-gce 2021/03/22 16:30 upstream 0d02ec6b3136 bea32f74 .config log report info KCSAN: data-race in __mark_inode_dirty / vfs_fsync_range
ci2-upstream-kcsan-gce 2021/02/23 16:50 upstream 3b9cdafb5358 fcc6d71b .config log report info KCSAN: data-race in __mark_inode_dirty / vfs_fsync_range
ci2-upstream-kcsan-gce 2021/02/21 19:44 upstream 55f62bc87347 a659b3f1 .config log report info KCSAN: data-race in __mark_inode_dirty / vfs_fsync_range