Re: 4.14: WARNING: CPU: 4 PID: 2895 at block/blk-mq.c:1144 with virtio-blk (also 4.12 stable)
From: Christian Borntraeger <hidden>
Date: 2017-11-29 19:36:54
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On 11/29/2017 08:18 PM, Christian Borntraeger wrote:
Works fine under KVM with virtio-blk, but still hangs during boot in an LPAR. FWIW, the system not only has scsi disks via fcp but also DASDs as a boot disk. Seems that this is the place where the system stops. (see the sysrq-t output at the bottom).
FWIW, the failing kernel had CONFIG_NR_CPUS=256 and 32 CPUS (with SMT2) == 64 threads with CONFIG_NR_CPUS=16 the system booted fine.