Hi all, The error is in usbtmc_interrupt(struct urb *urb) since five years. The status code EPROTO is not handled correctly. It's not a showstopper, but we should fix it and check the status code according to usbtmc_read_bulk_cb() or usb_skeleton.c. @Dave: Do you have time? Otherwise I can do it. @Greg: Is it urgent?
- Guido -----Original Message----- From: Dmitry Sent: Monday, April 19, 2021 9:27 AM Subject: Re: [syzbot] INFO: rcu detected stall in tx On Mon, Apr 19, 2021 at 9:19 AM syzbot <syzbot+e2eae5639e7203360...@syzkaller.appspotmail.com> wrote: > > Hello, > > syzbot found the following issue on: > > HEAD commit: 50987bec Merge tag 'trace-v5.12-rc7' of git://git.kernel.o.. > git tree: upstream > console output: > https://syzkaller.appspot.com/x/log.txt?x=1065c5fcd00000 > kernel config: > https://syzkaller.appspot.com/x/.config?x=398c4d0fe6f66e68 > dashboard link: > https://syzkaller.appspot.com/bug?extid=e2eae5639e7203360018 > > Unfortunately, I don't have any reproducer for this issue yet. > > IMPORTANT: if you fix the issue, please add the following tag to the commit: > Reported-by: syzbot+e2eae5639e7203360...@syzkaller.appspotmail.com > > usbtmc 5-1:0.0: unknown status received: -71 usbtmc 3-1:0.0: unknown > status received: -71 usbtmc 5-1:0.0: unknown status received: -71 The log shows an infinite stream of these before the stall, so I assume it's an infinite loop in usbtmc. +usbtmc maintainers [ 370.171634][ C0] usbtmc 6-1:0.0: unknown status received: -71 [ 370.177799][ C1] usbtmc 3-1:0.0: unknown status received: -71 [ 370.183912][ C0] usbtmc 4-1:0.0: unknown status received: -71 [ 370.190076][ C1] usbtmc 5-1:0.0: unknown status received: -71 [ 370.196194][ C0] usbtmc 2-1:0.0: unknown status received: -71 [ 370.202387][ C1] usbtmc 3-1:0.0: unknown status received: -71 [ 370.208460][ C0] usbtmc 6-1:0.0: unknown status received: -71 [ 370.214615][ C1] usbtmc 5-1:0.0: unknown status received: -71 [ 370.220736][ C0] usbtmc 4-1:0.0: unknown status received: -71 [ 370.226902][ C1] usbtmc 3-1:0.0: unknown status received: -71 [ 370.233005][ C0] usbtmc 2-1:0.0: unknown status received: -71 [ 370.239168][ C1] usbtmc 5-1:0.0: unknown status received: -71 [ 370.245271][ C0] usbtmc 6-1:0.0: unknown status received: -71 [ 370.251426][ C1] usbtmc 3-1:0.0: unknown status received: -71 [ 370.257552][ C0] usbtmc 4-1:0.0: unknown status received: -71 [ 370.263715][ C1] usbtmc 5-1:0.0: unknown status received: -71 [ 370.269819][ C0] usbtmc 2-1:0.0: unknown status received: -71 [ 370.275974][ C1] usbtmc 3-1:0.0: unknown status received: -71 [ 370.282100][ C0] usbtmc 6-1:0.0: unknown status received: -71 [ 370.288262][ C1] usbtmc 5-1:0.0: unknown status received: -71 [ 370.294399][ C0] usbtmc 4-1:0.0: unknown status received: -71 Content provided within this e-mail including any attachments, is for the use of the intended recipients and may contain Rohde & Schwarz company restricted information. Any unauthorized use, disclosure, or distribution of this communication in whole or in part is strictly prohibited. If you are not the intended recipient, please notify the sender by reply email or by telephone and delete the communication in its entirety.
