syzbot


KCSAN: data-race in filemap_read / generic_write_end (3)

Status: auto-obsoleted due to no activity on 2023/07/29 13:16
Subsystems: ext4
[Documentation on labels]
Reported-by: syzbot+e1ffd4430e9e7942349a@syzkaller.appspotmail.com
First crash: 860d, last: 268d
Similar bugs (2)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream KCSAN: data-race in filemap_read / generic_write_end ext4 3 1033d 1041d 0/26 auto-closed as invalid on 2021/06/25 01:21
upstream KCSAN: data-race in filemap_read / generic_write_end (2) ext4 8 902d 975d 0/26 auto-closed as invalid on 2021/11/02 13:17

Sample crash report:
==================================================================
BUG: KCSAN: data-race in filemap_read / generic_write_end

write to 0xffff88810a1f8c08 of 8 bytes by task 4746 on cpu 1:
 i_size_write include/linux/fs.h:905 [inline]
 generic_write_end+0xb4/0x360 fs/buffer.c:2241
 ext4_da_write_end+0x4df/0x690 fs/ext4/inode.c:3012
 generic_perform_write+0x253/0x3d0 mm/filemap.c:3940
 ext4_buffered_write_iter+0x234/0x3e0 fs/ext4/file.c:289
 ext4_file_write_iter+0xd7/0x10e0
 call_write_iter include/linux/fs.h:1868 [inline]
 new_sync_write fs/read_write.c:491 [inline]
 vfs_write+0x47b/0x780 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

read to 0xffff88810a1f8c08 of 8 bytes by task 4764 on cpu 0:
 i_size_read include/linux/fs.h:883 [inline]
 filemap_read+0x247/0x680 mm/filemap.c:2709
 generic_file_read_iter+0x76/0x320 mm/filemap.c:2843
 ext4_file_read_iter+0x1cc/0x290
 call_read_iter include/linux/fs.h:1862 [inline]
 generic_file_splice_read+0xe3/0x290 fs/splice.c:419
 do_splice_to fs/splice.c:902 [inline]
 splice_direct_to_actor+0x25a/0x5f0 fs/splice.c:973
 do_splice_direct+0x104/0x180 fs/splice.c:1082
 do_sendfile+0x3b8/0x950 fs/read_write.c:1254
 __do_sys_sendfile64 fs/read_write.c:1322 [inline]
 __se_sys_sendfile64 fs/read_write.c:1308 [inline]
 __x64_sys_sendfile64+0x110/0x150 fs/read_write.c:1308
 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: 0x000000000083f000 -> 0x0000000000840000

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 4764 Comm: syz-executor.0 Not tainted 6.4.0-rc7-syzkaller-00226-ga92b7d26c743 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/27/2023
==================================================================

Crashes (296):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2023/06/24 13:16 upstream a92b7d26c743 79782afc .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in filemap_read / generic_write_end
2023/06/21 11:26 upstream e660abd551f1 79782afc .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in filemap_read / generic_write_end
2023/06/19 07:58 upstream 45a3e24f65e9 f3921d4d .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in filemap_read / generic_write_end
2023/06/14 20:58 upstream b6dad5178cea 76decb82 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in filemap_read / generic_write_end
2023/06/14 10:06 upstream b6dad5178cea d2ee9228 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in filemap_read / generic_write_end
2023/06/10 10:40 upstream 64569520920a 49519f06 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in filemap_read / generic_write_end
2023/06/10 04:41 upstream 64569520920a 9018a337 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in filemap_read / generic_write_end
2023/05/27 21:06 upstream 4e893b5aa4ac cf184559 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in filemap_read / generic_write_end
2023/05/10 23:33 upstream d295b66a7b66 14b12a99 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in filemap_read / generic_write_end
2023/05/06 09:51 upstream 2e1e1337881b de870ca5 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in filemap_read / generic_write_end
2023/05/05 15:51 upstream 78b421b6a7c6 de870ca5 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in filemap_read / generic_write_end
2023/04/29 06:29 upstream 89d77f71f493 62df2017 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in filemap_read / generic_write_end
2023/04/26 22:26 upstream 5c7ecada25d2 19a3dabe .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in filemap_read / generic_write_end
2023/04/15 08:17 upstream 7a934f4bd7d6 ec410564 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in filemap_read / generic_write_end
2023/04/04 10:01 upstream 148341f0a2f5 928dd177 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in filemap_read / generic_write_end
2023/03/29 18:37 upstream ffe78bbd5121 f325deb0 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in filemap_read / generic_write_end
2023/03/21 08:22 upstream 17214b70a159 7939252e .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in filemap_read / generic_write_end
2023/03/09 19:53 upstream 44889ba56cbb f08b59ac .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in filemap_read / generic_write_end
2023/03/08 21:07 upstream 6a98c9cae232 4fc6d98d .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in filemap_read / generic_write_end
2023/03/05 20:23 upstream f915322fe014 f8902b57 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in filemap_read / generic_write_end
2023/03/04 11:29 upstream 0988a0ea7919 f8902b57 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in filemap_read / generic_write_end
2023/03/01 20:59 upstream ee3f96b16468 f8902b57 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in filemap_read / generic_write_end
2023/02/28 11:10 upstream ae3419fbac84 95aee97a .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in filemap_read / generic_write_end
2023/02/26 09:18 upstream 2fcd07b7ccd5 ee50e71c .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in filemap_read / generic_write_end
2023/02/19 12:55 upstream 925cf0457d7e bcdf85f8 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in filemap_read / generic_write_end
2023/02/18 22:37 upstream 5e725d112e1a bcdf85f8 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in filemap_read / generic_write_end
2023/02/10 12:19 upstream 38c1e0c65865 e29a17f5 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in filemap_read / generic_write_end
2023/02/07 20:31 upstream 513c1a3d3f19 15c3d445 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in filemap_read / generic_write_end
2023/02/06 13:36 upstream d2d11f342b17 0a9c11b6 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in filemap_read / generic_write_end
2023/02/04 04:07 upstream 0136d86b7852 1b2f701a .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in filemap_read / generic_write_end
2023/01/30 10:04 upstream 6d796c50f84c 9dfcf09c .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in filemap_read / generic_write_end
2023/01/18 11:30 upstream c1649ec55708 4620c2d9 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in filemap_read / generic_write_end
2023/01/11 13:29 upstream 7dd4b804e080 96166539 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in filemap_read / generic_write_end
2023/01/11 02:01 upstream 40c18f363a08 48bc529a .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in filemap_read / generic_write_end
2022/12/25 22:37 upstream 1b929c02afd3 9da18ae8 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in filemap_read / generic_write_end
2022/12/22 11:56 upstream 0a924817d2ed 9da18ae8 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in filemap_read / generic_write_end
2022/11/28 11:18 upstream b7b275e60bcd 247de55b .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in filemap_read / generic_write_end
2022/11/06 21:37 upstream 089d1c31224e 6d752409 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in filemap_read / generic_write_end
2022/10/28 18:36 upstream 05c31d25cc96 8168b69e .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in filemap_read / generic_write_end
2022/10/28 00:08 upstream 23758867219c 5c716ff6 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in filemap_read / generic_write_end
2022/10/25 21:54 upstream 1a2dcbdde82e 45645420 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in filemap_read / generic_write_end
2022/10/24 08:21 upstream 247f34f7b803 faae2fda .config console log report info [disk image] [vmlinux] ci2-upstream-kcsan-gce KCSAN: data-race in filemap_read / generic_write_end
2022/10/17 01:59 upstream 2df76606db9d 67cb024c .config console log report info [disk image] [vmlinux] ci2-upstream-kcsan-gce KCSAN: data-race in filemap_read / generic_write_end
2022/10/10 23:35 upstream e2302539dd4f 5bcf0c31 .config console log report info [disk image] [vmlinux] ci2-upstream-kcsan-gce KCSAN: data-race in filemap_read / generic_write_end
2022/09/09 10:42 upstream 506357871c18 90058bdc .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in filemap_read / generic_write_end
2022/09/08 13:13 upstream 26b1224903b3 f3027468 .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in filemap_read / generic_write_end
2022/09/04 20:45 upstream 7e18e42e4b28 28811d0a .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in filemap_read / generic_write_end
2022/01/31 07:57 upstream 26291c54e111 a491ad2d .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in filemap_read / generic_write_end
2022/01/29 21:14 upstream f8c7e4ede46f 495e00c5 .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in filemap_read / generic_write_end
2021/11/09 13:53 upstream d2f38a3c6507 59bcaf9a .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in filemap_read / generic_write_end
* Struck through repros no longer work on HEAD.