Date: Fri, 30 May 2025 12:01:30 +0000 From: bugzilla-noreply@freebsd.org To: bugs@FreeBSD.org Subject: [Bug 287161] [regression] kernel and user processes use 100% CPU time, related to n277037-d15792780760 Message-ID: <bug-287161-227@https.bugs.freebsd.org/bugzilla/>
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=287161 Bug ID: 287161 Summary: [regression] kernel and user processes use 100% CPU time, related to n277037-d15792780760 Product: Base System Version: CURRENT Hardware: amd64 OS: Any Status: New Severity: Affects Only Me Priority: --- Component: kern Assignee: bugs@FreeBSD.org Reporter: rz-rpi03@h-ka.de Hello, on a VM with a customised kernel configuration, based on MINIMAL, runs the latest exim(8) form pkg. Nowadays after some time exim(8) and the kernel uses 100% of all given CPUs. This happens approximately between 9 and 45 minutes after the VM has started. I think the time is related to the work exim(8) has to do. Meanwhile I bisect this change in behaviour down from n277447-9ce5410b9094 to n277037-d15792780760 (unix: new implementation of unix/stream & unix/seqpacket). A ktrace from three exim(8) processes showed 5 to 8 million calls to poll(2) until the trace stopped. Here is an example how the ktraces looked: 93266 exim CALL poll(0x8209d59f0,0x2,0x1388) 93266 exim STRU struct pollfd[] = { { fd=-1, events=0x1<POLLIN>, revents=0} { fd=9, events=0x1<POLLIN>, revents=0x10<POLLHUP>} } 93266 exim RET poll 1 93266 exim CALL poll(0x8209d59f0,0x2,0x1388) 93266 exim STRU struct pollfd[] = { { fd=-1, events=0x1<POLLIN>, revents=0} { fd=9, events=0x1<POLLIN>, revents=0x10<POLLHUP>} } 93266 exim RET poll 1 93266 exim CALL poll(0x8209d59f0,0x2,0x1388) 93266 exim STRU struct pollfd[] = { { fd=-1, events=0x1<POLLIN>, revents=0} { fd=9, events=0x1<POLLIN>, revents=0x10<POLLHUP>} } 93266 exim RET poll 1 93266 exim CALL poll(0x8209d59f0,0x2,0x1388) 93266 exim STRU struct pollfd[] = { { fd=-1, events=0x1<POLLIN>, revents=0} { fd=9, events=0x1<POLLIN>, revents=0x10<POLLHUP>} } ... Kind regards, Ralf -- You are receiving this mail because: You are the assignee for the bug.home | help
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