syzbot


KCSAN: data-race in vfs_fsync_range / writeback_single_inode (7)

Status: moderation: reported on 2024/05/19 01:02
Subsystems: ext4 exfat
[Documentation on labels]
Reported-by: syzbot+4c44219108ba2e8e8f19@syzkaller.appspotmail.com
First crash: 276d, last: 1d05h
Similar bugs (6)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream KCSAN: data-race in vfs_fsync_range / writeback_single_inode (4) exfat 101 660d 926d 0/28 auto-obsoleted due to no activity on 2023/06/05 02:12
upstream KCSAN: data-race in vfs_fsync_range / writeback_single_inode (3) exfat 12 985d 1098d 0/28 auto-closed as invalid on 2022/07/14 22:12
upstream KCSAN: data-race in vfs_fsync_range / writeback_single_inode (5) exfat 3 592d 612d 0/28 auto-obsoleted due to no activity on 2023/08/12 00:00
upstream KCSAN: data-race in vfs_fsync_range / writeback_single_inode (6) exfat 13 365d 437d 0/28 auto-obsoleted due to no activity on 2024/03/25 18:33
upstream KCSAN: data-race in vfs_fsync_range / writeback_single_inode exfat 12 1716d 1942d 0/28 closed as invalid on 2020/06/18 14:24
upstream KCSAN: data-race in vfs_fsync_range / writeback_single_inode (2) exfat 131 1171d 1535d 0/28 auto-closed as invalid on 2022/01/09 20:31

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

write to 0xffff888106689328 of 4 bytes by task 9007 on cpu 1:
 writeback_single_inode+0x14f/0x3f0 fs/fs-writeback.c:1798
 sync_inode_metadata+0x5c/0x90 fs/fs-writeback.c:2871
 __generic_file_fsync+0xed/0x140 fs/libfs.c:1536
 fat_file_fsync+0x46/0x100 fs/fat/file.c:191
 vfs_fsync_range+0x116/0x130 fs/sync.c:187
 generic_write_sync include/linux/fs.h:2970 [inline]
 generic_file_write_iter+0x1c3/0x310 mm/filemap.c:4320
 iter_file_splice_write+0x5f1/0x980 fs/splice.c:743
 do_splice_from fs/splice.c:941 [inline]
 direct_splice_actor+0x160/0x2c0 fs/splice.c:1164
 splice_direct_to_actor+0x302/0x670 fs/splice.c:1108
 do_splice_direct_actor fs/splice.c:1207 [inline]
 do_splice_direct+0xd7/0x150 fs/splice.c:1233
 do_sendfile+0x398/0x660 fs/read_write.c:1363
 __do_sys_sendfile64 fs/read_write.c:1424 [inline]
 __se_sys_sendfile64 fs/read_write.c:1410 [inline]
 __x64_sys_sendfile64+0x110/0x150 fs/read_write.c:1410
 x64_sys_call+0xfbd/0x2dc0 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 0xffff888106689328 of 4 bytes by task 9008 on cpu 0:
 vfs_fsync_range+0x9a/0x130 fs/sync.c:185
 generic_write_sync include/linux/fs.h:2970 [inline]
 generic_file_write_iter+0x1c3/0x310 mm/filemap.c:4320
 iter_file_splice_write+0x5f1/0x980 fs/splice.c:743
 do_splice_from fs/splice.c:941 [inline]
 direct_splice_actor+0x160/0x2c0 fs/splice.c:1164
 splice_direct_to_actor+0x302/0x670 fs/splice.c:1108
 do_splice_direct_actor fs/splice.c:1207 [inline]
 do_splice_direct+0xd7/0x150 fs/splice.c:1233
 do_sendfile+0x398/0x660 fs/read_write.c:1363
 __do_sys_sendfile64 fs/read_write.c:1424 [inline]
 __se_sys_sendfile64 fs/read_write.c:1410 [inline]
 __x64_sys_sendfile64+0x110/0x150 fs/read_write.c:1410
 x64_sys_call+0xfbd/0x2dc0 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: 0x00000038 -> 0x00000022

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 9008 Comm: syz.3.1386 Not tainted 6.14.0-rc3-syzkaller-00012-g2408a807bfc3 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024
==================================================================
syz.3.1386: attempt to access beyond end of device
loop3: rw=2049, sector=241, nr_sectors = 136 limit=128

Crashes (283):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2025/02/18 10:35 upstream 2408a807bfc3 c37c7249 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in vfs_fsync_range / writeback_single_inode
2025/02/18 01:52 upstream 2408a807bfc3 429ea007 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in vfs_fsync_range / writeback_single_inode
2025/02/17 15:43 upstream 0ad2507d5d93 4121cf9d .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in vfs_fsync_range / writeback_single_inode
2025/02/16 23:58 upstream 224e74511041 40a34ec9 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in vfs_fsync_range / writeback_single_inode
2025/02/16 12:14 upstream ad1b832bf1cf 40a34ec9 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in vfs_fsync_range / writeback_single_inode
2025/02/15 21:44 upstream 496659003dac 40a34ec9 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in vfs_fsync_range / writeback_single_inode
2025/02/15 10:19 upstream 78a632a2086c 40a34ec9 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in vfs_fsync_range / writeback_single_inode
2025/02/14 20:33 upstream 128c8f96eb86 1022af74 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in vfs_fsync_range / writeback_single_inode
2025/02/14 03:33 upstream 68763b29e0a6 d9a046cf .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in vfs_fsync_range / writeback_single_inode
2025/02/13 14:36 upstream 4dc1d1bec898 a98a8417 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in vfs_fsync_range / writeback_single_inode
2025/02/13 04:59 upstream 4dc1d1bec898 b27c2402 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in vfs_fsync_range / writeback_single_inode
2025/02/12 13:19 upstream 09fbf3d50205 b27c2402 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in vfs_fsync_range / writeback_single_inode
2025/02/11 21:14 upstream 09fbf3d50205 f2baddf5 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in vfs_fsync_range / writeback_single_inode
2025/02/11 18:05 upstream febbc555cf0f f2baddf5 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in vfs_fsync_range / writeback_single_inode
2025/02/11 04:06 upstream febbc555cf0f 43f51a00 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in vfs_fsync_range / writeback_single_inode
2025/02/10 18:13 upstream a64dcfb451e2 43f51a00 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in vfs_fsync_range / writeback_single_inode
2025/02/10 11:38 upstream a64dcfb451e2 ef44b750 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in vfs_fsync_range / writeback_single_inode
2025/02/09 23:46 upstream 69b54314c975 ef44b750 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in vfs_fsync_range / writeback_single_inode
2025/02/09 07:06 upstream 9946eaf552b1 ef44b750 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in vfs_fsync_range / writeback_single_inode
2025/02/08 13:35 upstream 8f6629c004b1 ef44b750 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in vfs_fsync_range / writeback_single_inode
2025/02/08 09:10 upstream 7ee983c850b4 ef44b750 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in vfs_fsync_range / writeback_single_inode
2025/02/06 07:06 upstream 92514ef226f5 577d049b .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in vfs_fsync_range / writeback_single_inode
2025/02/05 05:24 upstream d009de7d5428 5896748e .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in vfs_fsync_range / writeback_single_inode
2025/02/04 10:26 upstream 0de63bb7d919 8f267cef .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in vfs_fsync_range / writeback_single_inode
2025/02/03 11:54 upstream 2014c95afece a21a8419 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in vfs_fsync_range / writeback_single_inode
2025/02/01 23:51 upstream cabb4685d57e 568559e4 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in vfs_fsync_range / writeback_single_inode
2025/01/31 19:08 upstream 69b8923f5003 aa47157c .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in vfs_fsync_range / writeback_single_inode
2025/01/30 18:31 upstream 72deda0abee6 4c6ac32f .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in vfs_fsync_range / writeback_single_inode
2025/01/30 09:02 upstream ebbb8be421ee afe4eff5 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in vfs_fsync_range / writeback_single_inode
2025/01/29 16:05 upstream 05dbaf8dd8bf 136953f1 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in vfs_fsync_range / writeback_single_inode
2025/01/28 14:50 upstream 6d61a53dd6f5 f5427d7c .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in vfs_fsync_range / writeback_single_inode
2025/01/27 12:29 upstream 9c5968db9e62 d99a33ad .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in vfs_fsync_range / writeback_single_inode
2025/01/27 00:45 upstream c2da8b3f914f 9fbd772e .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in vfs_fsync_range / writeback_single_inode
2025/01/26 08:54 upstream aa22f4da2a46 9fbd772e .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in vfs_fsync_range / writeback_single_inode
2025/01/25 19:36 upstream 0f8e26b38d7a 9fbd772e .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in vfs_fsync_range / writeback_single_inode
2025/01/25 04:56 upstream b46c89c08f41 9fbd772e .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in vfs_fsync_range / writeback_single_inode
2025/01/24 17:28 upstream 113691ce9f32 1293872d .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in vfs_fsync_range / writeback_single_inode
2025/01/24 08:55 upstream bc8198dc7ebc 521b0ce3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in vfs_fsync_range / writeback_single_inode
2025/01/23 21:46 upstream d0d106a2bd21 521b0ce3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in vfs_fsync_range / writeback_single_inode
2025/01/23 14:18 upstream 21266b8df522 a44b0418 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in vfs_fsync_range / writeback_single_inode
2025/01/22 20:25 upstream df60eac9efe8 a44b0418 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in vfs_fsync_range / writeback_single_inode
2025/01/22 16:08 upstream c4b9570cfb63 a44b0418 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in vfs_fsync_range / writeback_single_inode
2025/01/22 09:29 upstream c4b9570cfb63 da72ac06 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in vfs_fsync_range / writeback_single_inode
2024/05/19 01:01 upstream 4b377b4868ef c0f1611a .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in vfs_fsync_range / writeback_single_inode
* Struck through repros no longer work on HEAD.