syzbot


KCSAN: data-race in generic_buffers_fsync_noflush / writeback_single_inode (3)

Status: upstream: reported on 2024/08/02 07:50
Subsystems: ext4
[Documentation on labels]
Reported-by: syzbot+35257a2200785ea628f5@syzkaller.appspotmail.com
First crash: 238d, last: 2h33m
Discussions (5)
Title Replies (including bot) Last reply
[syzbot] Monthly ext4 report (Mar 2025) 0 (1) 2025/03/24 18:56
[syzbot] Monthly ext4 report (Feb 2025) 0 (1) 2025/02/21 09:41
[syzbot] Monthly ext4 report (Jan 2025) 0 (1) 2025/01/20 13:06
[syzbot] Monthly ext4 report (Nov 2024) 0 (1) 2024/11/18 10:39
[syzbot] [ext4?] KCSAN: data-race in generic_buffers_fsync_noflush / writeback_single_inode (3) 0 (1) 2024/08/02 07:50
Similar bugs (2)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream KCSAN: data-race in generic_buffers_fsync_noflush / writeback_single_inode (2) ext4 1 313d 313d 0/28 auto-obsoleted due to no activity on 2024/06/23 00:58
upstream KCSAN: data-race in generic_buffers_fsync_noflush / writeback_single_inode ext4 5 451d 474d 0/28 auto-obsoleted due to no activity on 2024/02/05 20:10

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

write to 0xffff88810654fb68 of 4 bytes by task 5100 on cpu 1:
 writeback_single_inode+0x14f/0x3f0 fs/fs-writeback.c:1798
 sync_inode_metadata+0x60/0x90 fs/fs-writeback.c:2883
 generic_buffers_fsync_noflush+0xd8/0x120 fs/buffer.c:610
 ext4_fsync_nojournal fs/ext4/fsync.c:88 [inline]
 ext4_sync_file+0x1c3/0x6c0 fs/ext4/fsync.c:147
 vfs_fsync_range+0x116/0x130 fs/sync.c:187
 generic_write_sync include/linux/fs.h:2976 [inline]
 ext4_buffered_write_iter+0x358/0x3c0 fs/ext4/file.c:305
 ext4_file_write_iter+0x3b2/0xf80 include/linux/fs.h:-1
 iter_file_splice_write+0x5f2/0x980 fs/splice.c:738
 do_splice_from fs/splice.c:935 [inline]
 direct_splice_actor+0x160/0x2c0 fs/splice.c:1158
 splice_direct_to_actor+0x305/0x680 fs/splice.c:1102
 do_splice_direct_actor fs/splice.c:1201 [inline]
 do_splice_direct+0xd9/0x150 fs/splice.c:1227
 do_sendfile+0x40a/0x690 fs/read_write.c:1368
 __do_sys_sendfile64 fs/read_write.c:1429 [inline]
 __se_sys_sendfile64 fs/read_write.c:1415 [inline]
 __x64_sys_sendfile64+0x113/0x160 fs/read_write.c:1415
 x64_sys_call+0xfc3/0x2e10 arch/x86/include/generated/asm/syscalls_64.h:41
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xc9/0x1c0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffff88810654fb68 of 4 bytes by task 5103 on cpu 0:
 generic_buffers_fsync_noflush+0x83/0x120 fs/buffer.c:605
 ext4_fsync_nojournal fs/ext4/fsync.c:88 [inline]
 ext4_sync_file+0x1c3/0x6c0 fs/ext4/fsync.c:147
 vfs_fsync_range+0x116/0x130 fs/sync.c:187
 generic_write_sync include/linux/fs.h:2976 [inline]
 ext4_buffered_write_iter+0x358/0x3c0 fs/ext4/file.c:305
 ext4_file_write_iter+0x3b2/0xf80 include/linux/fs.h:-1
 iter_file_splice_write+0x5f2/0x980 fs/splice.c:738
 do_splice_from fs/splice.c:935 [inline]
 direct_splice_actor+0x160/0x2c0 fs/splice.c:1158
 splice_direct_to_actor+0x305/0x680 fs/splice.c:1102
 do_splice_direct_actor fs/splice.c:1201 [inline]
 do_splice_direct+0xd9/0x150 fs/splice.c:1227
 do_sendfile+0x40a/0x690 fs/read_write.c:1368
 __do_sys_sendfile64 fs/read_write.c:1429 [inline]
 __se_sys_sendfile64 fs/read_write.c:1415 [inline]
 __x64_sys_sendfile64+0x113/0x160 fs/read_write.c:1415
 x64_sys_call+0xfc3/0x2e10 arch/x86/include/generated/asm/syscalls_64.h:41
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xc9/0x1c0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0x00000038 -> 0x00000002

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 5103 Comm: syz.3.686 Not tainted 6.14.0-syzkaller-07422-gacb4f33713b9 #0 PREEMPT(voluntary) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
==================================================================

Crashes (249):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2025/03/28 04:43 upstream acb4f33713b9 6c09fb82 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in generic_buffers_fsync_noflush / writeback_single_inode
2025/03/27 17:42 upstream 1a9239bb4253 6c09fb82 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in generic_buffers_fsync_noflush / writeback_single_inode
2025/03/27 02:08 upstream 1e1ba8d23dae 20510e88 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in generic_buffers_fsync_noflush / writeback_single_inode
2025/03/26 22:33 upstream 2df0c02dab82 20510e88 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in generic_buffers_fsync_noflush / writeback_single_inode
2025/03/25 19:35 upstream 2df0c02dab82 875573af .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in generic_buffers_fsync_noflush / writeback_single_inode
2025/03/25 06:50 upstream 3ba7dfb8da62 875573af .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in generic_buffers_fsync_noflush / writeback_single_inode
2025/03/24 04:17 upstream 586de92313fc 875573af .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in generic_buffers_fsync_noflush / writeback_single_inode
2025/03/23 21:49 upstream 586de92313fc 4e8d3850 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in generic_buffers_fsync_noflush / writeback_single_inode
2025/03/23 00:05 upstream 183601b78a9b c6512ef7 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in generic_buffers_fsync_noflush / writeback_single_inode
2025/03/22 01:08 upstream d07de43e3f05 c6512ef7 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in generic_buffers_fsync_noflush / writeback_single_inode
2025/03/21 14:55 upstream b3ee1e460951 62330552 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in generic_buffers_fsync_noflush / writeback_single_inode
2025/03/19 21:54 upstream a7f2e10ecd8f e20d7b13 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in generic_buffers_fsync_noflush / writeback_single_inode
2025/03/17 17:02 upstream 4701f33a1070 948c34e4 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in generic_buffers_fsync_noflush / writeback_single_inode
2025/03/16 06:48 upstream 31d7109a19f6 e2826670 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in generic_buffers_fsync_noflush / writeback_single_inode
2025/03/15 07:10 upstream a29967be967e e2826670 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in generic_buffers_fsync_noflush / writeback_single_inode
2025/03/14 01:37 upstream 4003c9e78778 e2826670 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in generic_buffers_fsync_noflush / writeback_single_inode
2025/03/13 09:23 upstream b7f94fcf5546 44be8b44 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in generic_buffers_fsync_noflush / writeback_single_inode
2025/03/12 15:36 upstream 0fed89a961ea ee70e6db .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in generic_buffers_fsync_noflush / writeback_single_inode
2025/03/12 03:34 upstream 0b46b049d6ec ee70e6db .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in generic_buffers_fsync_noflush / writeback_single_inode
2025/03/10 07:29 upstream 80e54e84911a 163f510d .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in generic_buffers_fsync_noflush / writeback_single_inode
2025/03/09 17:12 upstream 1110ce6a1e34 163f510d .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in generic_buffers_fsync_noflush / writeback_single_inode
2025/03/09 02:34 upstream b7c90e3e717a 163f510d .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in generic_buffers_fsync_noflush / writeback_single_inode
2025/03/08 18:18 upstream 2a520073e74f 7e3bd60d .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in generic_buffers_fsync_noflush / writeback_single_inode
2025/03/08 05:28 upstream 21e4543a2e2f 7e3bd60d .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in generic_buffers_fsync_noflush / writeback_single_inode
2025/03/07 11:30 upstream 0f52fd4f67c6 831e3629 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in generic_buffers_fsync_noflush / writeback_single_inode
2025/03/06 20:34 upstream 848e07631744 831e3629 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in generic_buffers_fsync_noflush / writeback_single_inode
2025/03/06 09:24 upstream bb2281fb05e5 831e3629 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in generic_buffers_fsync_noflush / writeback_single_inode
2025/03/04 12:41 upstream 99fa936e8e4f c3901742 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in generic_buffers_fsync_noflush / writeback_single_inode
2025/03/03 18:01 upstream 7eb172143d55 c3901742 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in generic_buffers_fsync_noflush / writeback_single_inode
2025/03/02 08:10 upstream ece144f151ac c3901742 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in generic_buffers_fsync_noflush / writeback_single_inode
2025/02/27 15:52 upstream dd83757f6e68 6a8fcbc4 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in generic_buffers_fsync_noflush / writeback_single_inode
2025/02/27 05:41 upstream 5394eea10651 6a8fcbc4 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in generic_buffers_fsync_noflush / writeback_single_inode
2025/02/26 10:53 upstream ac9c34d1e45a d34966d1 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in generic_buffers_fsync_noflush / writeback_single_inode
2025/02/26 02:44 upstream 2a1944bff549 d34966d1 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in generic_buffers_fsync_noflush / writeback_single_inode
2025/02/24 01:32 upstream d082ecbc71e9 d34966d1 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in generic_buffers_fsync_noflush / writeback_single_inode
2025/02/22 23:59 upstream 5cf80612d3f7 d34966d1 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in generic_buffers_fsync_noflush / writeback_single_inode
2025/02/22 08:30 upstream ff202c5028a1 d34966d1 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in generic_buffers_fsync_noflush / writeback_single_inode
2025/02/21 12:33 upstream 334426094588 0808a665 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in generic_buffers_fsync_noflush / writeback_single_inode
2025/02/20 20:32 upstream e9a8cac0bf89 0808a665 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in generic_buffers_fsync_noflush / writeback_single_inode
2025/02/20 06:56 upstream 87a132e73910 50668798 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in generic_buffers_fsync_noflush / writeback_single_inode
2025/02/19 20:52 upstream 6537cfb395f3 b257a9b7 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in generic_buffers_fsync_noflush / writeback_single_inode
2025/02/18 12:20 upstream 2408a807bfc3 c37c7249 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in generic_buffers_fsync_noflush / writeback_single_inode
2025/02/17 18:29 upstream 0ad2507d5d93 4121cf9d .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in generic_buffers_fsync_noflush / writeback_single_inode
2025/02/17 01:38 upstream 224e74511041 40a34ec9 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in generic_buffers_fsync_noflush / writeback_single_inode
2025/02/16 20:42 upstream ad1b832bf1cf 40a34ec9 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in generic_buffers_fsync_noflush / writeback_single_inode
2025/02/16 04:50 upstream 496659003dac 40a34ec9 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in generic_buffers_fsync_noflush / writeback_single_inode
2025/02/15 06:23 upstream 78a632a2086c 40a34ec9 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in generic_buffers_fsync_noflush / writeback_single_inode
2025/02/15 05:02 upstream 78a632a2086c 1022af74 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in generic_buffers_fsync_noflush / writeback_single_inode
2025/02/15 01:41 upstream 128c8f96eb86 1022af74 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in generic_buffers_fsync_noflush / writeback_single_inode
2025/02/14 03:55 upstream 68763b29e0a6 d9a046cf .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in generic_buffers_fsync_noflush / writeback_single_inode
2024/08/01 21:04 upstream 183d46ff422e 1e9c4cf3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in generic_buffers_fsync_noflush / writeback_single_inode
* Struck through repros no longer work on HEAD.