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KCSAN: data-race in filemap_splice_read / generic_file_direct_write (2)

Status: auto-obsoleted due to no activity on 2024/03/31 13:21
Subsystems: fs
[Documentation on labels]
Reported-by: syzbot+f17c46e8d1aa26039602@syzkaller.appspotmail.com
First crash: 49d, last: 49d
Similar bugs (1)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream KCSAN: data-race in filemap_splice_read / generic_file_direct_write fs 1 242d 242d 0/26 auto-obsoleted due to no activity on 2023/09/20 11:05

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

write to 0xffff888140f1f168 of 8 bytes by task 27791 on cpu 0:
 i_size_write include/linux/fs.h:934 [inline]
 generic_file_direct_write+0x19d/0x1f0 mm/filemap.c:3882
 __generic_file_write_iter+0xae/0x120 mm/filemap.c:4011
 generic_file_write_iter+0x7d/0x1c0 mm/filemap.c:4051
 call_write_iter include/linux/fs.h:2087 [inline]
 iter_file_splice_write+0x5de/0x950 fs/splice.c:743
 do_splice_from fs/splice.c:941 [inline]
 direct_splice_actor+0x167/0x2c0 fs/splice.c:1164
 splice_direct_to_actor+0x2fb/0x660 fs/splice.c:1108
 do_splice_direct_actor fs/splice.c:1207 [inline]
 do_splice_direct+0xd7/0x150 fs/splice.c:1233
 do_sendfile+0x3b9/0x960 fs/read_write.c:1295
 __do_sys_sendfile64 fs/read_write.c:1362 [inline]
 __se_sys_sendfile64 fs/read_write.c:1348 [inline]
 __x64_sys_sendfile64+0x110/0x150 fs/read_write.c:1348
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x1d0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x63/0x6b

read to 0xffff888140f1f168 of 8 bytes by task 27792 on cpu 1:
 i_size_read include/linux/fs.h:912 [inline]
 filemap_splice_read+0x770/0x8f0 mm/filemap.c:2868
 do_splice_read fs/splice.c:985 [inline]
 splice_direct_to_actor+0x268/0x660 fs/splice.c:1089
 do_splice_direct_actor fs/splice.c:1207 [inline]
 do_splice_direct+0xd7/0x150 fs/splice.c:1233
 do_sendfile+0x3b9/0x960 fs/read_write.c:1295
 __do_sys_sendfile64 fs/read_write.c:1362 [inline]
 __se_sys_sendfile64 fs/read_write.c:1348 [inline]
 __x64_sys_sendfile64+0x110/0x150 fs/read_write.c:1348
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x1d0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x63/0x6b

value changed: 0x000000000000b600 -> 0x000000000000b800

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 27792 Comm: syz-executor.1 Not tainted 6.8.0-rc5-syzkaller-00329-gab0a97cffa0b #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024
==================================================================

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2024/02/25 13:20 upstream ab0a97cffa0b 8d446f15 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in filemap_splice_read / generic_file_direct_write
* Struck through repros no longer work on HEAD.