syzbot


KCSAN: data-race in filemap_read / truncate_setsize (2)

Status: auto-closed as invalid on 2021/10/23 13:44
Reported-by: syzbot+@syzkaller.appspotmail.com
First crash: 440d, last: 440d
similar bugs (4):
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream KCSAN: data-race in filemap_read / truncate_setsize (3) 2 380d 391d 0/24 auto-closed as invalid on 2021/12/23 02:33
upstream KCSAN: data-race in filemap_read / truncate_setsize 1 593d 593d 0/24 auto-closed as invalid on 2021/05/24 01:14
upstream KCSAN: data-race in filemap_read / truncate_setsize (5) 2 177d 209d 0/24 auto-closed as invalid on 2022/07/13 18:41
upstream KCSAN: data-race in filemap_read / truncate_setsize (4) 1 262d 262d 0/24 auto-closed as invalid on 2022/04/19 18:12

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

write to 0xffff888149745ab0 of 8 bytes by task 5356 on cpu 1:
 i_size_write include/linux/fs.h:916 [inline]
 truncate_setsize+0x2a/0xc0 mm/truncate.c:757
 simple_setattr+0x87/0xb0 fs/libfs.c:508
 notify_change+0x8a3/0xac0 fs/attr.c:410
 do_truncate+0xf7/0x140 fs/open.c:64
 handle_truncate fs/namei.c:3084 [inline]
 do_open fs/namei.c:3432 [inline]
 path_openat+0x1925/0x1ec0 fs/namei.c:3561
 do_filp_open+0x105/0x220 fs/namei.c:3588
 do_sys_openat2+0xb5/0x2b0 fs/open.c:1200
 do_sys_open fs/open.c:1216 [inline]
 __do_sys_creat fs/open.c:1290 [inline]
 __se_sys_creat fs/open.c:1284 [inline]
 __x64_sys_creat+0x62/0x80 fs/open.c:1284
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x44/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffff888149745ab0 of 8 bytes by task 5345 on cpu 0:
 i_size_read include/linux/fs.h:894 [inline]
 filemap_read+0xd55/0x1220 mm/filemap.c:2640
 generic_file_read_iter+0x75/0x2c0 mm/filemap.c:2779
 call_read_iter include/linux/fs.h:2157 [inline]
 generic_file_splice_read+0x24f/0x330 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+0x106/0x190 fs/splice.c:979
 do_sendfile+0x63e/0xbb0 fs/read_write.c:1249
 __do_sys_sendfile64 fs/read_write.c:1314 [inline]
 __se_sys_sendfile64 fs/read_write.c:1300 [inline]
 __x64_sys_sendfile64+0x102/0x140 fs/read_write.c:1300
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x44/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

value changed: 0x00000000004dc401 -> 0x0000000000000000

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 5345 Comm: syz-executor.2 Tainted: G        W         5.15.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================

Crashes (1):
Manager Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Title
ci2-upstream-kcsan-gce 2021/09/18 13:42 upstream 4357f03d6611 70b76c1d .config log report info KCSAN: data-race in filemap_read / truncate_setsize
* Struck through repros no longer work on HEAD.