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KCSAN: data-race in __skb_wait_for_more_packets / unix_release_sock (8)

Status: auto-obsoleted due to no activity on 2023/01/13 19:25
Subsystems: net
[Documentation on labels]
First crash: 480d, last: 480d
Similar bugs (7)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream KCSAN: data-race in __skb_wait_for_more_packets / unix_release_sock (3) net 1 1143d 1143d 0/26 auto-closed as invalid on 2021/03/16 10:18
upstream KCSAN: data-race in __skb_wait_for_more_packets / unix_release_sock (7) net 1 685d 685d 0/26 auto-closed as invalid on 2022/06/17 02:34
upstream KCSAN: data-race in __skb_wait_for_more_packets / unix_release_sock net 1 1441d 1441d 0/26 auto-closed as invalid on 2020/06/18 13:53
upstream KCSAN: data-race in __skb_wait_for_more_packets / unix_release_sock (5) net 7 876d 966d 0/26 auto-closed as invalid on 2021/12/08 03:28
upstream KCSAN: data-race in __skb_wait_for_more_packets / unix_release_sock (2) net 1 1237d 1203d 0/26 auto-closed as invalid on 2020/12/25 11:24
upstream KCSAN: data-race in __skb_wait_for_more_packets / unix_release_sock (4) net 5 1038d 1077d 0/26 auto-closed as invalid on 2021/06/29 03:52
upstream KCSAN: data-race in __skb_wait_for_more_packets / unix_release_sock (6) net 1 803d 803d 0/26 auto-closed as invalid on 2022/02/19 07:24

Sample crash report:
==================================================================
BUG: KCSAN: data-race in __skb_wait_for_more_packets / unix_release_sock

write to 0xffff888101a42462 of 1 bytes by task 19889 on cpu 1:
 unix_release_sock+0x3c9/0x7b0 net/unix/af_unix.c:630
 unix_release+0x4e/0x70 net/unix/af_unix.c:1041
 __sock_release net/socket.c:650 [inline]
 sock_close+0x6c/0x150 net/socket.c:1365
 __fput+0x245/0x570 fs/file_table.c:320
 ____fput+0x11/0x20 fs/file_table.c:348
 task_work_run+0xde/0x110 kernel/task_work.c:179
 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]
 exit_to_user_mode_loop+0x124/0x130 kernel/entry/common.c:171
 exit_to_user_mode_prepare kernel/entry/common.c:203 [inline]
 __syscall_exit_to_user_mode_work kernel/entry/common.c:285 [inline]
 syscall_exit_to_user_mode+0x6a/0x90 kernel/entry/common.c:296
 do_syscall_64+0x37/0x70 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

read to 0xffff888101a42462 of 1 bytes by task 19890 on cpu 0:
 __skb_wait_for_more_packets+0xe8/0x2f0 net/core/datagram.c:104
 __unix_dgram_recvmsg+0x20c/0x8b0 net/unix/af_unix.c:2451
 unix_dgram_recvmsg net/unix/af_unix.c:2535 [inline]
 unix_seqpacket_recvmsg+0xa1/0xb0 net/unix/af_unix.c:2404
 sock_recvmsg_nosec net/socket.c:995 [inline]
 sock_recvmsg net/socket.c:1013 [inline]
 sock_read_iter+0x1b1/0x1f0 net/socket.c:1086
 call_read_iter include/linux/fs.h:2193 [inline]
 generic_file_splice_read+0xde/0x2b0 fs/splice.c:309
 sock_splice_read+0xa5/0xb0 net/socket.c:1064
 do_splice_to fs/splice.c:793 [inline]
 splice_file_to_pipe+0x237/0x360 fs/splice.c:1013
 do_splice+0xc05/0xd90 fs/splice.c:1099
 __do_splice fs/splice.c:1139 [inline]
 __do_sys_splice fs/splice.c:1346 [inline]
 __se_sys_splice+0x2a4/0x380 fs/splice.c:1328
 __x64_sys_splice+0x74/0x80 fs/splice.c:1328
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

value changed: 0x00 -> 0x03

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 19890 Comm: syz-executor.0 Not tainted 6.1.0-rc7-syzkaller-00200-gc2bf05db6c78-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022
==================================================================

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2022/12/04 12:06 upstream c2bf05db6c78 e080de16 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __skb_wait_for_more_packets / unix_release_sock
* Struck through repros no longer work on HEAD.