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================================================================== BUG: KCSAN: data-race in __skb_recv_udp / datagram_poll write to 0xffff888123ae8b50 of 8 bytes by task 10254 on cpu 1: __skb_queue_head_init include/linux/skbuff.h:1815 [inline] skb_queue_splice_tail_init include/linux/skbuff.h:1929 [inline] __skb_recv_udp+0x29b/0x500 net/ipv4/udp.c:1664 udpv6_recvmsg+0x29e/0xe90 net/ipv6/udp.c:288 inet6_recvmsg+0xbb/0x240 net/ipv6/af_inet6.c:592 sock_recvmsg_nosec+0x5c/0x70 net/socket.c:871 ___sys_recvmsg+0x1a0/0x3e0 net/socket.c:2480 do_recvmmsg+0x19a/0x5c0 net/socket.c:2601 __sys_recvmmsg+0x1ef/0x200 net/socket.c:2680 __do_sys_recvmmsg net/socket.c:2703 [inline] __se_sys_recvmmsg net/socket.c:2696 [inline] __x64_sys_recvmmsg+0x89/0xb0 net/socket.c:2696 do_syscall_64+0xcc/0x370 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x44/0xa9 read to 0xffff888123ae8b50 of 8 bytes by task 10281 on cpu 0: skb_queue_empty include/linux/skbuff.h:1494 [inline] datagram_poll+0x16e/0x300 net/core/datagram.c:780 udp_poll+0x30/0x110 net/ipv4/udp.c:2712 sock_poll+0xed/0x250 net/socket.c:1256 vfs_poll include/linux/poll.h:90 [inline] do_pollfd fs/select.c:859 [inline] do_poll fs/select.c:907 [inline] do_sys_poll+0x4ac/0x990 fs/select.c:1001 __do_sys_ppoll fs/select.c:1101 [inline] __se_sys_ppoll fs/select.c:1081 [inline] __x64_sys_ppoll+0x161/0x1a0 fs/select.c:1081 do_syscall_64+0xcc/0x370 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Reported by Kernel Concurrency Sanitizer on: CPU: 0 PID: 10281 Comm: syz-executor.3 Not tainted 5.4.0-rc3+ #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================
Time | Kernel | Commit | Syzkaller | Config | Log | Report | Syz repro | C repro | VM info | Assets (help?) | Manager | Title |
---|---|---|---|---|---|---|---|---|---|---|---|---|
2019/11/03 15:51 | https://github.com/google/ktsan.git kcsan | 05f2236801fe | c9610487 | .config | console log | report | ci2-upstream-kcsan-gce |