Hello, syzbot found the following crash on: HEAD commit: b12d66a6 mm, kcsan: Instrument SLAB free with ASSERT_EXCLU.. git tree: https://github.com/google/ktsan.git kcsan console output: https://syzkaller.appspot.com/x/log.txt?x=111f0865e00000 kernel config: https://syzkaller.appspot.com/x/.config?x=10bc0131c4924ba9 dashboard link: https://syzkaller.appspot.com/bug?extid=6a6bca8169ffda8ce77b compiler: gcc (GCC) 9.0.0 20181231 (experimental) Unfortunately, I don't have any reproducer for this crash yet. IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+6a6bca8169ffda8ce77b@xxxxxxxxxxxxxxxxxxxxxxxxx ================================================================== BUG: KCSAN: data-race in glue_cbc_decrypt_req_128bit / glue_cbc_decrypt_req_128bit write to 0xffff88809966e128 of 8 bytes by task 24119 on cpu 0: u128_xor include/crypto/b128ops.h:67 [inline] glue_cbc_decrypt_req_128bit+0x396/0x460 arch/x86/crypto/glue_helper.c:144 cbc_decrypt+0x26/0x40 arch/x86/crypto/serpent_avx2_glue.c:152 crypto_skcipher_decrypt+0x65/0x90 crypto/skcipher.c:652 _skcipher_recvmsg crypto/algif_skcipher.c:142 [inline] skcipher_recvmsg+0x7fa/0x8c0 crypto/algif_skcipher.c:161 skcipher_recvmsg_nokey+0x5e/0x80 crypto/algif_skcipher.c:279 sock_recvmsg_nosec net/socket.c:886 [inline] sock_recvmsg net/socket.c:904 [inline] sock_recvmsg+0x92/0xb0 net/socket.c:900 ____sys_recvmsg+0x167/0x3a0 net/socket.c:2566 ___sys_recvmsg+0xb2/0x100 net/socket.c:2608 __sys_recvmsg+0x9d/0x160 net/socket.c:2642 __do_sys_recvmsg net/socket.c:2652 [inline] __se_sys_recvmsg net/socket.c:2649 [inline] __x64_sys_recvmsg+0x51/0x70 net/socket.c:2649 do_syscall_64+0xcc/0x3a0 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x44/0xa9 read to 0xffff88809966e128 of 8 bytes by task 24118 on cpu 1: u128_xor include/crypto/b128ops.h:67 [inline] glue_cbc_decrypt_req_128bit+0x37c/0x460 arch/x86/crypto/glue_helper.c:144 cbc_decrypt+0x26/0x40 arch/x86/crypto/serpent_avx2_glue.c:152 crypto_skcipher_decrypt+0x65/0x90 crypto/skcipher.c:652 _skcipher_recvmsg crypto/algif_skcipher.c:142 [inline] skcipher_recvmsg+0x7fa/0x8c0 crypto/algif_skcipher.c:161 skcipher_recvmsg_nokey+0x5e/0x80 crypto/algif_skcipher.c:279 sock_recvmsg_nosec net/socket.c:886 [inline] sock_recvmsg net/socket.c:904 [inline] sock_recvmsg+0x92/0xb0 net/socket.c:900 ____sys_recvmsg+0x167/0x3a0 net/socket.c:2566 ___sys_recvmsg+0xb2/0x100 net/socket.c:2608 __sys_recvmsg+0x9d/0x160 net/socket.c:2642 __do_sys_recvmsg net/socket.c:2652 [inline] __se_sys_recvmsg net/socket.c:2649 [inline] __x64_sys_recvmsg+0x51/0x70 net/socket.c:2649 do_syscall_64+0xcc/0x3a0 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 24118 Comm: syz-executor.1 Not tainted 5.6.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ================================================================== --- This bug is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@xxxxxxxxxxxxxxxx. syzbot will keep track of this bug report. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
