KCSAN: data-race in ext4_handle_inode_extension / generic_file_buffered_read

Status: auto-closed as invalid on 2021/03/28 09:57
Subsystems: ext4
[Documentation on labels]
Reported-by: syzbot+745a40728c2f32a454b6@syzkaller.appspotmail.com
First crash: 2236d, last: 1996d

Sample crash report:
==================================================================
BUG: KCSAN: data-race in ext4_handle_inode_extension / generic_file_buffered_read

write to 0xffff8880121f6290 of 8 bytes by task 10742 on cpu 0:
 i_size_write include/linux/fs.h:870 [inline]
 ext4_update_inode_size fs/ext4/ext4.h:3285 [inline]
 ext4_handle_inode_extension+0x226/0x550 fs/ext4/file.c:332
 ext4_dio_write_iter fs/ext4/file.c:558 [inline]
 ext4_file_write_iter+0xeaa/0x1060 fs/ext4/file.c:662
 call_write_iter include/linux/fs.h:1901 [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+0x41a/0x770 fs/splice.c:686
 do_splice_from fs/splice.c:764 [inline]
 direct_splice_actor+0x80/0xa0 fs/splice.c:933
 splice_direct_to_actor+0x345/0x650 fs/splice.c:888
 do_splice_direct+0xf5/0x170 fs/splice.c:976
 do_sendfile+0x5e0/0xcf0 fs/read_write.c:1257
 __do_sys_sendfile64 fs/read_write.c:1318 [inline]
 __se_sys_sendfile64 fs/read_write.c:1304 [inline]
 __x64_sys_sendfile64+0xf2/0x130 fs/read_write.c:1304
 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff8880121f6290 of 8 bytes by task 10736 on cpu 1:
 i_size_read include/linux/fs.h:848 [inline]
 generic_file_buffered_read+0x290/0x9c0 mm/filemap.c:2500
 generic_file_read_iter+0x82/0x3e0 mm/filemap.c:2637
 ext4_file_read_iter+0x2e0/0x430 fs/ext4/file.c:74
 call_read_iter include/linux/fs.h:1895 [inline]
 generic_file_splice_read+0x22a/0x310 fs/splice.c:311
 do_splice_to fs/splice.c:788 [inline]
 splice_direct_to_actor+0x2aa/0x650 fs/splice.c:867
 do_splice_direct+0xf5/0x170 fs/splice.c:976
 do_sendfile+0x5e0/0xcf0 fs/read_write.c:1257
 __do_sys_sendfile64 fs/read_write.c:1312 [inline]
 __se_sys_sendfile64 fs/read_write.c:1304 [inline]
 __x64_sys_sendfile64+0xa9/0x130 fs/read_write.c:1304
 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 10736 Comm: syz-executor.1 Not tainted 5.11.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================

Crashes (120):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2021/02/21 09:57 upstream e767b3530acb 3e5ed8b4 .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in ext4_handle_inode_extension / generic_file_buffered_read
2021/02/20 16:30 upstream f40ddce88593 3e5ed8b4 .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in ext4_handle_inode_extension / generic_file_buffered_read
2021/02/15 06:04 upstream f40ddce88593 98682e5e .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in ext4_handle_inode_extension / generic_file_buffered_read
2021/02/15 00:48 upstream 358feceebbf6 98682e5e .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in ext4_handle_inode_extension / generic_file_buffered_read
2021/02/13 00:39 upstream dcc0b49040c7 98682e5e .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in ext4_handle_inode_extension / generic_file_buffered_read
2021/02/12 12:14 upstream dcc0b49040c7 a5f86b15 .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in ext4_handle_inode_extension / generic_file_buffered_read
2021/02/11 19:09 upstream 291009f656e8 a5f86b15 .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in ext4_handle_inode_extension / generic_file_buffered_read
2021/02/08 03:01 upstream b75dba7f472c 2ce644fc .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in ext4_handle_inode_extension / generic_file_buffered_read
2021/02/07 10:14 upstream 825b5991a46e 2ce644fc .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in ext4_handle_inode_extension / generic_file_buffered_read
2021/02/07 04:52 upstream 964d069f93c4 0655e081 .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in ext4_handle_inode_extension / generic_file_buffered_read
2021/02/06 03:32 upstream 1e0d27fce010 23a562df .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in ext4_handle_inode_extension / generic_file_buffered_read
2021/02/05 03:48 upstream 5c279c4cf206 23a562df .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in ext4_handle_inode_extension / generic_file_buffered_read
2021/02/04 17:45 upstream 61556703b610 42b90a7c .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in ext4_handle_inode_extension / generic_file_buffered_read
2021/02/03 11:46 upstream 3aaf0a27ffc2 624dad51 .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in ext4_handle_inode_extension / generic_file_buffered_read
2021/02/02 10:29 upstream 88bb507a74ea 19e09687 .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in ext4_handle_inode_extension / generic_file_buffered_read
2021/02/01 21:15 upstream 88bb507a74ea e6b95f32 .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in ext4_handle_inode_extension / generic_file_buffered_read
2021/01/31 12:46 upstream 6642d600b541 fc9fd31e .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in ext4_handle_inode_extension / generic_file_buffered_read
2021/01/29 05:01 upstream e5ff2cb9cf67 7df34f59 .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in ext4_handle_inode_extension / generic_file_buffered_read
2021/01/27 19:49 upstream 76c057c84d28 a57db36f .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in ext4_handle_inode_extension / generic_file_buffered_read
2021/01/26 14:51 upstream 13391c60da33 52e37319 .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in ext4_handle_inode_extension / generic_file_buffered_read
2021/01/24 21:54 upstream e68061375f79 52e37319 .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in ext4_handle_inode_extension / generic_file_buffered_read
2021/01/18 22:09 upstream 1e2a199f6ccd 63631df1 .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in ext4_handle_inode_extension / generic_file_buffered_read
2021/01/16 23:23 upstream 54c6247d06f1 65a7a854 .config console log report info ci2-upstream-kcsan-gce
2021/01/12 00:59 upstream a0d54b4f5b21 2c1f2513 .config console log report info ci2-upstream-kcsan-gce
2021/01/08 21:37 upstream 6279d812eab6 c104d4a3 .config console log report info ci2-upstream-kcsan-gce
2021/01/07 04:23 upstream 71c061d24438 c104d4a3 .config console log report info ci2-upstream-kcsan-gce
2021/01/06 12:28 upstream 9f1abbe97c08 fff20c29 .config console log report info ci2-upstream-kcsan-gce
2021/01/04 05:23 upstream e71ba9452f0b 79264ae3 .config console log report info ci2-upstream-kcsan-gce
2021/01/03 03:32 upstream 3516bd729358 79264ae3 .config console log report info ci2-upstream-kcsan-gce
2021/01/02 02:49 upstream eda809aef534 79264ae3 .config console log report info ci2-upstream-kcsan-gce
2020/12/31 14:43 upstream f6e1ea196492 79264ae3 .config console log report info ci2-upstream-kcsan-gce
2020/12/29 15:57 upstream dea8dcf2a9fa 80910769 .config console log report info ci2-upstream-kcsan-gce
2020/12/29 02:25 upstream c76e02c59e13 8259d56c .config console log report info ci2-upstream-kcsan-gce
2020/12/28 04:50 upstream 5c8fe583cce5 2242f77f .config console log report info ci2-upstream-kcsan-gce
2020/12/26 14:04 upstream 40f78232f973 821e0b09 .config console log report info ci2-upstream-kcsan-gce
2020/12/25 11:06 upstream 71c5f03154ac b982b3ea .config console log report info ci2-upstream-kcsan-gce
2020/12/24 01:06 upstream 58cf05f597b0 c2c1d1dd .config console log report info ci2-upstream-kcsan-gce
2020/12/21 09:58 upstream e37b12e4bb21 04201c06 .config console log report info ci2-upstream-kcsan-gce
2020/12/15 22:10 upstream d635a69dd498 f213e07e .config console log report info ci2-upstream-kcsan-gce
2020/12/14 09:21 upstream 2c85ebc57b3e b22a7ec3 .config console log report info ci2-upstream-kcsan-gce
2020/12/13 23:39 upstream ec6f5e0e5ca0 8f160dd5 .config console log report info ci2-upstream-kcsan-gce
2020/12/13 10:32 upstream 6bff9bb8a292 bca53db9 .config console log report info ci2-upstream-kcsan-gce
2020/12/12 21:33 upstream 7b1b868e1d91 bca53db9 .config console log report info ci2-upstream-kcsan-gce
2020/12/12 00:11 upstream 7f376f1917d7 bca53db9 .config console log report info ci2-upstream-kcsan-gce
2020/12/11 14:15 upstream 33dc9614dc20 ba24ffcd .config console log report info ci2-upstream-kcsan-gce
2020/12/11 03:57 upstream 9fca90cf2892 f900b48c .config console log report info ci2-upstream-kcsan-gce
2020/12/10 11:16 upstream a2f5ea9e314b 2a55c22b .config console log report info ci2-upstream-kcsan-gce
2020/12/09 21:47 upstream ca4bbdaf1716 c090b4da .config console log report info ci2-upstream-kcsan-gce
2020/12/09 09:41 upstream a68a0262abda 99917735 .config console log report info ci2-upstream-kcsan-gce
2020/12/08 11:18 upstream cd796ed33450 9af51e31 .config console log report info ci2-upstream-kcsan-gce
2020/12/06 09:28 upstream 7059c2c00a21 f12ba0c5 .config console log report info ci2-upstream-kcsan-gce
2020/12/05 22:37 upstream 32f741b02f1a 50503117 .config console log report info ci2-upstream-kcsan-gce
2020/11/10 08:26 upstream 407ab579637c cca87986 .config console log report info ci2-upstream-kcsan-gce
2020/06/25 20:28 upstream 908f7d12d3ba adb7d9e6 .config console log report ci2-upstream-kcsan-gce
* Struck through repros no longer work on HEAD.