Bug 14179

Summary:	Lockup in pty_write/tty_wakeup when using PPTP
Product:	Drivers	Reporter:	Andrey Rahmatullin (wrar)
Component:	Other	Assignee:	drivers_other
Status:	CLOSED CODE_FIX
Severity:	high
Priority:	P1
Hardware:	All
OS:	Linux
Kernel Version:	2.6.31	Subsystem:
Regression:	Yes	Bisected commit-id:
Attachments:	vsftpd stack trace

Description Andrey Rahmatullin 2009-09-15 13:18:26 UTC

Created attachment 23095 [details]
vsftpd stack trace

Commit ac89a9174decf343de049a06fad75681f71890eb broke my PPTP: when the box tries to send large data using wide bandwidth (I tried vsftpd and nginx and speed about 500 Kbytes/s and faster), the box locks up after less than second. SysRq+P shows vsftpd or softirqd (in case of nginx) locked in tty_wakeup. One such backtrace is attached. Reverting ac89a9174decf343de049a06fad75681f71890eb fixes this regression.

Comment 1 Andrey Rahmatullin 2009-09-15 13:19:15 UTC

*** Bug 14180 has been marked as a duplicate of this bug. ***

Comment 2 Andrey Rahmatullin 2009-09-18 16:34:59 UTC

Fixed by 202c4675c55ddf6b443c7e057d2dff6b42ef71aa

Comment 3 Andrey Rahmatullin 2009-09-18 16:34:59 UTC

Fixed by 202c4675c55ddf6b443c7e057d2dff6b42ef71aa