** Tags added: kernel-daily-bug -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/2038852
Title: Isotp driver causes timeout because of race condition during nonblocking writes Status in linux package in Ubuntu: Confirmed Bug description: This are my system details Description: Ubuntu 20.04.6 LTS Release: 20.04 When using 5.15.133 kernel on Ubuntu 20.04. I am seeing that non blocking writes cause race condition and locks the socket. This issue is resolved by a patch from here https://lore.kernel.org/linux-can/96d31e8c-fa26-4e32-4c36-768981f20...@hartkopp.net/T/#u. This patch is supposed to make in the 6.7 kernel commit id 61caf48cf7 and I would like it to be fixed for 5.15 stream as well. I have tested that this patch when applied to 5.15.133 works. The patch cannot be directly applied but a more comprehensive look at the current code at net/can/isotp.c. This is a diff of my changes to isotp.c 119c119,120 < ISOTP_SENDING --- > ISOTP_SENDING, > ISOTP_SHUTDOWN, 873c874 < if (!so->bound) --- > if (!so->bound|| so->tx.state == ISOTP_SHUTDOWN) 876,893c877,887 < /* we do not support multiple buffers - for now */ < if (cmpxchg(&so->tx.state, ISOTP_IDLE, ISOTP_SENDING) != ISOTP_IDLE || < wq_has_sleeper(&so->wait)) { < if (msg->msg_flags & MSG_DONTWAIT) { < err = -EAGAIN; < goto err_out; < } < < /* wait for complete transmission of current pdu */ < err = wait_event_interruptible(so->wait, so->tx.state == ISOTP_IDLE); < if (err) < goto err_out; < } < < if (!size || size > MAX_MSG_LENGTH) { < err = -EINVAL; < goto err_out_drop; < } --- > while (cmpxchg(&so->tx.state, ISOTP_IDLE, ISOTP_SENDING) != ISOTP_IDLE) { > /* we do not support multiple buffers - for now */ > if (msg->msg_flags & MSG_DONTWAIT) > return -EAGAIN; > if (so->tx.state == ISOTP_SHUTDOWN) > return -EADDRNOTAVAIL; > /* wait for complete transmission of current pdu */ > err = wait_event_interruptible(so->wait, so->tx.state == ISOTP_IDLE); > if (err) > goto err_out; > } To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2038852/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
