Messages in this thread | | | Date | Mon, 26 Sep 2022 10:06:58 +0200 | Subject | Re: [PATCH v3 6/6] freezer,sched: Rewrite core freezer logic | From | Christian Borntraeger <> |
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Am 23.09.22 um 09:53 schrieb Christian Borntraeger: > Am 23.09.22 um 09:21 schrieb Christian Borntraeger: >> Peter, >> >> as a heads-up. This commit (bisected and verified) triggers a >> regression in our KVM on s390x CI. The symptom is that a specific >> testcase (start a guest with next kernel and a poky ramdisk, >> then ssh via vsock into the guest and run the reboot command) now >> takes much longer (300 instead of 20 seconds). From a first look >> it seems that the sshd takes very long to end during shutdown >> but I have not looked into that yet. >> Any quick idea? >> >> Christian > > the sshd seems to hang in virtio-serial (not vsock).
FWIW, sshd does not seem to hang, instead it seems to busy loop in wait_port_writable calling into the scheduler over and over again.
> > PID: 237 TASK: 81d1a100 CPU: 1 COMMAND: "sshd" > LOWCORE INFO: > -psw : 0x0404e00180000000 0x0000000131ceb136 > -function : __list_add_valid at 131ceb136 > -prefix : 0x00410000 > -cpu timer: 0x7fffffd3ec4f33d4 > -clock cmp: 0x2639f08006283e00 > -general registers: > 0x00000008dcea2dce 0x00000001387d44b8 > 0x0000000081d1a228 0x00000001387d44b8 > 0x00000001387d44b8 0x00000001387d44b8 > 0x00000001387d3800 0x00000001387d3700 > 0x0000000081d1a100 0x00000001387d44b8 > 0x00000001387d44b8 0x0000000081d1a228 > 0x0000000081d1a100 0x0000000081d1a100 > 0x0000000131608b32 0x00000380004b7aa8 > -access registers: > 0x000003ff 0x8fff5870 0000000000 0000000000 > 0000000000 0000000000 0000000000 0000000000 > 0000000000 0000000000 0000000000 0000000000 > 0000000000 0000000000 0000000000 0000000000 > -control registers: > 0x00a0000014966a10 0x0000000133348007 > 0x00000000028c6140 000000000000000000 > 0x000000000000ffff 0x00000000028c6140 > 0x0000000033000000 0x0000000081f001c7 > 0x0000000000008000 000000000000000000 > 000000000000000000 000000000000000000 > 000000000000000000 0x0000000133348007 > 0x00000000db000000 0x00000000028c6000 > -floating point registers: > 0x000003ffb82a9761 0x0000006400000000 > 0x000003ffb82a345c 000000000000000000 > 0x0000000000007fff 0x000003ffe22fe000 > 000000000000000000 0x000003ffe22fa51c > 0x000003ffb81889c0 000000000000000000 > 0x000002aa3ce2b470 000000000000000000 > 000000000000000000 000000000000000000 > 000000000000000000 000000000000000000 > > #0 [380004b7b00] pick_next_task at 1315f2088 > #1 [380004b7b98] __schedule at 13215e954 > #2 [380004b7c08] schedule at 13215eeea > #3 [380004b7c38] wait_port_writable at 3ff80149b2e [virtio_console] > #4 [380004b7cc0] port_fops_write at 3ff8014a282 [virtio_console] > #5 [380004b7d40] vfs_write at 131889e3c > #6 [380004b7e00] ksys_write at 13188a2e8 > #7 [380004b7e50] __do_syscall at 13215761c > #8 [380004b7e98] system_call at 132166332 > PSW: 0705000180000000 000003ff8f8f3a2a (user space) > GPRS: 0000000000000015 000003ff00000000 ffffffffffffffda 000002aa02fc68a0 > 0000000000000015 0000000000000015 0000000000000000 000002aa02fc68a0 > 0000000000000004 000003ff8f8f3a08 0000000000000015 0000000000000000 > 000003ff8ffa9f58 0000000000000000 000002aa02365b20 000003ffdf4798d0
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