Date: Thu, 13 Mar 2014 02:18:24 -0700 From: Xin Li <delphij@delphij.net> To: FreeBSD Current <freebsd-current@FreeBSD.org> Cc: Alexander Motin <mav@ixsystems.com> Subject: Re: processes stuck in vmo_de state Message-ID: <532177E0.5010905@delphij.net> In-Reply-To: <531EBFDC.3010608@delphij.net> References: <531EBFDC.3010608@delphij.net>
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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA512 Hi, It looks like there is a regression (or a regression that gets exposed by some new feature) that is related to time-keeping or timecounter, although I'm not yet familiar with the related code to tell if my conclusion was right or not. The problem I observed is that when system boots up, it sometimes hangs and pressing ^T on console tells me that sleep(1) is running with 0 second out of 1 second, but the 'real' part of the output is smaller than 1 or sometimes negative. For some reason the console may stop giving any output, but trapping into debugger would unblock it sometimes. When sh(1) stuck in 'vmo_de' state, it would never recover from that and a hard reset is necessary. It seems that commenting hint.apic.0.clock=0 from my loader.conf would mitigate the issue by the way. I'll let the system sit there and do a full universe build, etc. for a while and check it tomorrow. Cheers, -----BEGIN PGP SIGNATURE----- iQIcBAEBCgAGBQJTIXfgAAoJEJW2GBstM+nsc1EP/1VbIXscDeufiuAOj+UmDWV1 LsEb7n2M6qVYuL7sTTqY7R5svUATcVRAxG/jjXTHObvvCdB/8Gjk+51K/cCN5wIV bKchxm2mv1ENbkFQJI3akntSbPeNk2iEAzORdvdcD/gkb5sIOxNGfeBp8/PtIO4x 3bKD2aRh7KdHzDWl4PdLiZSstLLuG1w6K0tFaoeWV0wu3e3GgMglK7kSq2H/ZWrn WCtcw9kJOFuRF2kIj1UMygvqL6IDt2UF8As7A4wO/HKCTMm3xj5tHQzn6JZFoRwR I2rILJtKrWRz8TUutV+ivD+2c0ZFpL6qn0ByQFtAPU3S1LQsgHZhgPNanvNVcmRQ zz35CTWYRdxIq1JTZTA9zd/At9jRJtRYenJxgK9btJfwF9TqtmWmwPcOIkaMPr5T uNHO5c+4gMQK96Km08cwkDCPoZTPNHJcAHgTlDMTM+TZ5vjVqyOI4wLcTwLecLca yFJIaBhYektAlPJZoNwNJJsv3ReBF77yKMNzaNAUAM5Cfu06I1DGsxmrFTpvx+t/ nnIjHF0djACuJq8CpVHe4r8gdEUSSc180gzgyyyCJc8cHGc8JphOdY10gNBc6Cki 4h5cAdGUNov0+NkqF0tmEwKvDoCb7ASph7yJbVymt+2t2gh4ay8T1BBH2k50deG8 rsO6gv8qzRZshwyXlZd0 =DaxI -----END PGP SIGNATURE-----
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