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KCSAN: data-race in smc_setsockopt / tcp_reset

Status: closed as invalid on 2022/01/20 12:18
Subsystems: net
[Documentation on labels]
First crash: 828d, last: 828d

Sample crash report:
==================================================================
BUG: KCSAN: data-race in smc_setsockopt / tcp_reset

write to 0xffff88810393cba8 of 4 bytes by task 11104 on cpu 1:
 tcp_reset+0xaf/0x1b0
 tcp_rcv_synsent_state_process+0x80c/0x14e0 net/ipv4/tcp_input.c:6156
 tcp_rcv_state_process+0x16c/0x1250 net/ipv4/tcp_input.c:6420
 tcp_v4_do_rcv+0x42c/0x590 net/ipv4/tcp_ipv4.c:1741
 sk_backlog_rcv include/net/sock.h:1037 [inline]
 __release_sock+0xf2/0x270 net/core/sock.c:2774
 release_sock+0x40/0x110 net/core/sock.c:3306
 inet_stream_connect+0x58/0x70 net/ipv4/af_inet.c:725
 kernel_connect+0x3e/0x50 net/socket.c:3441
 smc_connect+0x331/0x500 net/smc/af_smc.c:1279
 __sys_connect_file net/socket.c:1900 [inline]
 __sys_connect+0x197/0x1b0 net/socket.c:1917
 __do_sys_connect net/socket.c:1927 [inline]
 __se_sys_connect net/socket.c:1924 [inline]
 __x64_sys_connect+0x3d/0x50 net/socket.c:1924
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffff88810393cba8 of 4 bytes by task 11107 on cpu 0:
 smc_setsockopt+0x11e/0x5b0 net/smc/af_smc.c:2451
 __sys_setsockopt+0x209/0x2a0 net/socket.c:2180
 __do_sys_setsockopt net/socket.c:2191 [inline]
 __se_sys_setsockopt net/socket.c:2188 [inline]
 __x64_sys_setsockopt+0x62/0x70 net/socket.c:2188
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

value changed: 0x00000000 -> 0x0000006f

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 11107 Comm: syz-executor.5 Not tainted 5.16.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2022/01/19 01:24 upstream 99613159ad74 731a2d23 .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in smc_setsockopt / tcp_reset
* Struck through repros no longer work on HEAD.