syzbot

 sign-in | mailing list | source | docs
🐞 Open [1493]
≡ Subsystems
🐞 Fixed [6678]
🐞 Invalid [17140]
⬇ Missing Backports [214]
≡ Crashes
Kernel Health Bugs/Month Bug Lifetimes Fuzzing
Total Repo Heatmap Subsystems Heatmap
💬 Send us feedback

KCSAN: data-race in ondemand_readahead / ondemand_readahead (5)

Status: auto-closed as invalid on 2021/07/05 00:47
Subsystems: fs mm
[Documentation on labels]
First crash: 1615d, last: 1609d
▶ ▼ Similar bugs (10)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream KCSAN: data-race in ondemand_readahead / ondemand_readahead (4) mm fs 6 1 1654d 1654d 0/29 auto-closed as invalid on 2021/05/21 19:40
upstream KCSAN: data-race in ondemand_readahead / ondemand_readahead (2) fs mm 6 201 1731d 1892d 0/29 auto-closed as invalid on 2021/03/05 09:30
upstream KCSAN: data-race in ondemand_readahead / ondemand_readahead (10) fs mm 6 147 598d 688d 0/29 auto-obsoleted due to no activity on 2024/04/11 01:33
upstream KCSAN: data-race in ondemand_readahead / ondemand_readahead (8) fs mm 6 1 1252d 1252d 0/29 auto-closed as invalid on 2022/06/27 21:27
upstream KCSAN: data-race in ondemand_readahead / ondemand_readahead mm fs 6 44 1956d 2169d 0/29 closed as invalid on 2020/06/18 14:24
upstream KCSAN: data-race in ondemand_readahead / ondemand_readahead (9) fs mm 6 3 1156d 1162d 0/29 auto-closed as invalid on 2022/10/01 03:27
upstream KCSAN: data-race in ondemand_readahead / ondemand_readahead (3) fs mm 6 1 1691d 1691d 0/29 auto-closed as invalid on 2021/04/14 20:49
upstream KCSAN: data-race in ondemand_readahead / ondemand_readahead (7) mm fs 6 5 1314d 1377d 0/29 auto-closed as invalid on 2022/04/26 07:02
upstream KCSAN: data-race in ondemand_readahead / ondemand_readahead (6) mm fs 6 17 1480d 1550d 0/29 auto-closed as invalid on 2021/11/11 03:01
upstream KCSAN: data-race in ondemand_readahead / ondemand_readahead (11) fs mm 6 98 481d 558d 0/29 auto-obsoleted due to no activity on 2024/07/30 21:57

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

write to 0xffff888100865098 of 8 bytes by task 21154 on cpu 1:
 ondemand_readahead+0x25a/0x7b0 mm/readahead.c:527
 page_cache_sync_ra+0xaf/0xe0 mm/readahead.c:578
 page_cache_sync_readahead include/linux/pagemap.h:879 [inline]
 filemap_get_pages mm/filemap.c:2467 [inline]
 filemap_read+0x388/0x1230 mm/filemap.c:2550
 generic_file_read_iter+0x75/0x2c0 mm/filemap.c:2701
 ext4_file_read_iter+0x1db/0x290 fs/ext4/file.c:73
 call_read_iter include/linux/fs.h:2108 [inline]
 generic_file_splice_read+0x22a/0x310 fs/splice.c:311
 do_splice_to fs/splice.c:796 [inline]
 splice_direct_to_actor+0x2aa/0x650 fs/splice.c:870
 do_splice_direct+0xf5/0x170 fs/splice.c:979
 do_sendfile+0x773/0xda0 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+0x4a/0x90 arch/x86/entry/common.c:47
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffff888100865098 of 8 bytes by task 21161 on cpu 0:
 ondemand_readahead+0x172/0x7b0 mm/readahead.c:463
 page_cache_sync_ra+0xaf/0xe0 mm/readahead.c:578
 page_cache_sync_readahead include/linux/pagemap.h:879 [inline]
 filemap_get_pages mm/filemap.c:2467 [inline]
 filemap_read+0x388/0x1230 mm/filemap.c:2550
 generic_file_read_iter+0x75/0x2c0 mm/filemap.c:2701
 ext4_file_read_iter+0x1db/0x290 fs/ext4/file.c:73
 call_read_iter include/linux/fs.h:2108 [inline]
 generic_file_splice_read+0x22a/0x310 fs/splice.c:311
 do_splice_to fs/splice.c:796 [inline]
 splice_direct_to_actor+0x2aa/0x650 fs/splice.c:870
 do_splice_direct+0xf5/0x170 fs/splice.c:979
 do_sendfile+0x773/0xda0 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+0x4a/0x90 arch/x86/entry/common.c:47
 entry_SYSCALL_64_after_hwframe+0x44/0xae

value changed: 0x0000000000000838 -> 0x000000000000084d

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 21161 Comm: syz-executor.4 Not tainted 5.13.0-rc4-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================

Crashes (2):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2021/05/31 00:41 upstream 8124c8a6b353 325a8dab .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in ondemand_readahead / ondemand_readahead
2021/05/25 15:12 upstream 1434a3127887 3c7fef33 .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in ondemand_readahead / ondemand_readahead
* Struck through repros no longer work on HEAD.