KCSAN: data-race in filemap_read / filemap

Kernel	Title	Repro	Cause bisect	Fix bisect	Count	Last	Reported	Patched	Status
upstream	KCSAN: data-race in filemap_read / filemap_read fs				832	168d	1007d	0/26	auto-obsoleted due to no activity on 2023/12/20 06:43
upstream	KCSAN: data-race in filemap_read / filemap_read (3) fs				4	44d	78d	0/26	auto-obsoleted due to no activity on 2024/04/29 01:22

==================================================================
BUG: KCSAN: data-race in filemap_read / filemap_read

read to 0xffff88813c674b90 of 8 bytes by task 8032 on cpu 1:
 filemap_read+0x89/0x680 mm/filemap.c:2569
 generic_file_read_iter+0x78/0x330 mm/filemap.c:2772
 ext4_file_read_iter+0x1d8/0x2a0
 call_read_iter include/linux/fs.h:2014 [inline]
 copy_splice_read+0x26b/0x4b0 fs/splice.c:364
 vfs_splice_read fs/splice.c:992 [inline]
 splice_direct_to_actor+0x2aa/0x690 fs/splice.c:1069
 do_splice_direct+0x10d/0x190 fs/splice.c:1194
 do_sendfile+0x3c4/0x980 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:52 [inline]
 do_syscall_64+0x44/0x110 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x63/0x6b

write to 0xffff88813c674b90 of 8 bytes by task 8040 on cpu 0:
 filemap_read+0x605/0x680 mm/filemap.c:2662
 generic_file_read_iter+0x78/0x330 mm/filemap.c:2772
 ext4_file_read_iter+0x1d8/0x2a0
 call_read_iter include/linux/fs.h:2014 [inline]
 copy_splice_read+0x26b/0x4b0 fs/splice.c:364
 vfs_splice_read fs/splice.c:992 [inline]
 splice_direct_to_actor+0x2aa/0x690 fs/splice.c:1069
 do_splice_direct+0x10d/0x190 fs/splice.c:1194
 do_sendfile+0x3c4/0x980 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:52 [inline]
 do_syscall_64+0x44/0x110 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x63/0x6b

value changed: 0x0000000000000e4b -> 0x0000000000000e4c

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 8040 Comm: syz-executor.2 Not tainted 6.7.0-rc6-syzkaller-00176-g24e0d2e527a3 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/2023
==================================================================

Time	Kernel	Commit	Syzkaller	Config	Log	Report	Syz repro	C repro	VM info	Assets (help?)	Manager	Title
2023/12/22 23:05	upstream	24e0d2e527a3	fb427a07	.config	console log	report			info	[disk image] [vmlinux] [kernel image]	ci2-upstream-kcsan-gce	KCSAN: data-race in filemap_read / filemap_read
2023/12/20 07:49	upstream	55cb5f43689d	3ad490ea	.config	console log	report			info	[disk image] [vmlinux] [kernel image]	ci2-upstream-kcsan-gce	KCSAN: data-race in filemap_read / filemap_read