KCSAN: data-race in do_sendfile / ksys

Kernel	Title	Rank 🛈	Count	Last	Reported	Patched	Status
upstream	KCSAN: data-race in do_sendfile / ksys_write (17) fs	6	1	7d01h	7d01h	0/29	moderation: reported on 2026/02/23 09:50
upstream	KCSAN: data-race in do_sendfile / ksys_write (16) fs	6	1	677d	677d	0/29	auto-obsoleted due to no activity on 2024/05/28 12:59
upstream	KCSAN: data-race in do_sendfile / ksys_write (7) fs	6	3	1499d	1523d	0/29	auto-closed as invalid on 2022/02/27 04:59
upstream	KCSAN: data-race in do_sendfile / ksys_write (8) fs	6	1	1458d	1458d	0/29	auto-closed as invalid on 2022/04/08 18:00
upstream	KCSAN: data-race in do_sendfile / ksys_write (12) fs	6	2	988d	1001d	0/29	auto-obsoleted due to no activity on 2023/07/23 08:25
upstream	KCSAN: data-race in do_sendfile / ksys_write (15) fs	6	1	737d	737d	0/29	auto-obsoleted due to no activity on 2024/03/29 14:30
upstream	KCSAN: data-race in do_sendfile / ksys_write fs	6	1	2311d	2311d	0/29	closed as invalid on 2019/11/19 13:24
upstream	KCSAN: data-race in do_sendfile / ksys_write (14) fs	6	2	813d	812d	0/29	auto-obsoleted due to no activity on 2024/01/14 07:58
upstream	KCSAN: data-race in do_sendfile / ksys_write (13) fs	6	5	881d	938d	0/29	auto-obsoleted due to no activity on 2023/11/07 08:57
upstream	KCSAN: data-race in do_sendfile / ksys_write (2) fs	6	2	2194d	2256d	0/29	auto-closed as invalid on 2020/05/08 04:57
upstream	KCSAN: data-race in do_sendfile / ksys_write (6) fs	6	1	1800d	1800d	0/29	auto-closed as invalid on 2021/05/17 10:56
upstream	KCSAN: data-race in do_sendfile / ksys_write (4) fs	6	1	1903d	1903d	0/29	auto-closed as invalid on 2021/01/18 19:47
upstream	KCSAN: data-race in do_sendfile / ksys_write (10) fs	6	1	1317d	1317d	0/29	auto-closed as invalid on 2022/08/27 13:39
upstream	KCSAN: data-race in do_sendfile / ksys_write (3) fs	6	1	1977d	1977d	0/29	auto-closed as invalid on 2020/11/06 02:13
upstream	KCSAN: data-race in do_sendfile / ksys_write (9) fs	6	2	1399d	1402d	0/29	auto-closed as invalid on 2022/06/06 18:20
upstream	KCSAN: data-race in do_sendfile / ksys_write (11) fs	6	1	1250d	1250d	0/29	auto-obsoleted due to no activity on 2022/11/02 18:18

================================================================== BUG: KCSAN: data-race in do_sendfile / ksys_write write to 0xffff88810ad21468 of 8 bytes by task 2766 on cpu 1: ksys_write+0x101/0x180 fs/read_write.c:660 __do_sys_write fs/read_write.c:670 [inline] __se_sys_write fs/read_write.c:667 [inline] __x64_sys_write+0x3e/0x50 fs/read_write.c:667 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 read to 0xffff88810ad21468 of 8 bytes by task 2774 on cpu 0: do_sendfile+0x328/0xca0 fs/read_write.c:1230 __do_sys_sendfile64 fs/read_write.c:1312 [inline] __se_sys_sendfile64 fs/read_write.c:1304 [inline] __x64_sys_sendfile64+0xa9/0x130 fs/read_write.c:1304 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Reported by Kernel Concurrency Sanitizer on: CPU: 0 PID: 2774 Comm: syz-executor.4 Not tainted 5.11.0-rc4-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ================================================================== Kernel panic - not syncing: panic_on_warn set ... CPU: 0 PID: 2774 Comm: syz-executor.4 Not tainted 5.11.0-rc4-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:79 [inline] dump_stack+0x116/0x15d lib/dump_stack.c:120 panic+0x1e7/0x5fa kernel/panic.c:231 kcsan_report+0x67b/0x680 kernel/kcsan/report.c:634 kcsan_setup_watchpoint+0x47b/0x4e0 kernel/kcsan/core.c:568 do_sendfile+0x328/0xca0 fs/read_write.c:1230 __do_sys_sendfile64 fs/read_write.c:1312 [inline] __se_sys_sendfile64 fs/read_write.c:1304 [inline] __x64_sys_sendfile64+0xa9/0x130 fs/read_write.c:1304 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45e219 Code: 0d b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 db b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f380cbd6c68 EFLAGS: 00000246 ORIG_RAX: 0000000000000028 RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 000000000045e219 RDX: 00000000200000c0 RSI: 0000000000000005 RDI: 0000000000000005 RBP: 000000000119c070 R08: 0000000000000000 R09: 0000000000000000 R10: 000000000000feff R11: 0000000000000246 R12: 000000000119c034 R13: 00007ffde25107ef R14: 00007f380cbd79c0 R15: 000000000119c034 Kernel Offset: disabled Rebooting in 86400 seconds..