KCSAN: data-race in filemap_read / truncate_setsize (7)

Status: auto-obsoleted due to no activity on 2023/07/14 20:15
Subsystems: exfat
[Documentation on labels]
First crash: 1171d, last: 1160d
▶ ▼ Similar bugs (6)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream KCSAN: data-race in filemap_read / truncate_setsize (3) fs 6 2 1729d 1740d 0/29 auto-closed as invalid on 2021/12/23 02:33
upstream KCSAN: data-race in filemap_read / truncate_setsize fs 6 1 1942d 1942d 0/29 auto-closed as invalid on 2021/05/24 01:14
upstream KCSAN: data-race in filemap_read / truncate_setsize (5) fs 6 2 1526d 1558d 0/29 auto-closed as invalid on 2022/07/13 18:41
upstream KCSAN: data-race in filemap_read / truncate_setsize (6) fs 6 1 1230d 1230d 0/29 auto-obsoleted due to no activity on 2023/05/06 12:01
upstream KCSAN: data-race in filemap_read / truncate_setsize (2) fs 6 1 1789d 1789d 0/29 auto-closed as invalid on 2021/10/23 13:44
upstream KCSAN: data-race in filemap_read / truncate_setsize (4) fs 6 1 1611d 1611d 0/29 auto-closed as invalid on 2022/04/19 18:12

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

read-write to 0xffff88813a844d28 of 8 bytes by task 3479 on cpu 1:
 i_size_write include/linux/fs.h:905 [inline]
 truncate_setsize+0x21/0xb0 mm/truncate.c:766
 fat_setattr+0x71f/0x840 fs/fat/file.c:550
 notify_change+0x8c3/0x930 fs/attr.c:483
 do_truncate+0x116/0x150 fs/open.c:66
 handle_truncate fs/namei.c:3295 [inline]
 do_open fs/namei.c:3640 [inline]
 path_openat+0x1984/0x1d00 fs/namei.c:3791
 do_filp_open+0xf6/0x200 fs/namei.c:3818
 do_sys_openat2+0xb5/0x2a0 fs/open.c:1356
 do_sys_open fs/open.c:1372 [inline]
 __do_sys_creat fs/open.c:1448 [inline]
 __se_sys_creat fs/open.c:1442 [inline]
 __x64_sys_creat+0x66/0x90 fs/open.c:1442
 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 0xffff88813a844d28 of 8 bytes by task 3478 on cpu 0:
 i_size_read include/linux/fs.h:883 [inline]
 filemap_read+0x247/0x680 mm/filemap.c:2703
 generic_file_read_iter+0x76/0x320 mm/filemap.c:2837
 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: 0x000000000009c1e3 -> 0x0000000000000000

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 3478 Comm: syz-executor.3 Not tainted 6.4.0-rc5-syzkaller-00178-g33f2b5785a2b #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/25/2023
==================================================================

Crashes (2):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2023/06/09 20:12 upstream 33f2b5785a2b 9018a337 .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in filemap_read / truncate_setsize
2023/05/30 00:11 upstream 8b817fded42d cf184559 .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in filemap_read / truncate_setsize
* Struck through repros no longer work on HEAD.