On 30/03/2017 12:34, Andrey Chernov wrote: > On 30.03.2017 12:23, Andrey Chernov wrote: >> Yes, only for reboot/shutdown. The system does not do anythings wrong >> even under high load. On reboot or hang those lines are never printed: >> >> kernel: Waiting (max 60 seconds) for system process `vnlru' to stop...done >> kernel: Waiting (max 60 seconds) for system process `bufdaemon' to >> stop...done >> kernel: Waiting (max 60 seconds) for system process `syncer' to stop... >> kernel: Syncing disks, vnodes remaining...5 3 0 1 0 0 done >> kernel: All buffers synced. >> (it is from 10-stable sample, old -current samples are lost) >> >> Moreover, GELI swap deactivation lines are never printed too (I already >> mention that I change swap to normal, but nothing is changed). > > I start to have raw guess that _any_ kernel printf in shutdown mode > cause not printf but premature reboot. This sounds somewhat familiar... I vaguely recall an opposite issue that happened in the past. After one of my changes the reboot started hanging for one user. Turned out that the actual bug was always there, but previously the system rebooted because of a printf that caused a LOR (between spinlocks, AFAIR), witness tried to report it... using printf, and that recursed and there was a triple fault in the end. Let me try to dig some details, maybe the current issue is related in some ways. By chance, do you have WITNESS but not WITNESS_SKIPSPIN in your kernel config? -- Andriy GaponReceived on Thu Mar 30 2017 - 09:24:54 UTC
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