Re: [PATCH 1/1] blk-mq: get ctx in order to handle BLK_MQ_S_INACTIVE in blk_mq_get_tag()

2020-06-03 Thread Dongli Zhang
Hi John, On 6/3/20 4:59 AM, John Garry wrote: > On 02/06/2020 07:17, Dongli Zhang wrote: >> When scheduler is set, we hit below page fault when we offline cpu. >> >> [ 1061.007725] BUG: kernel NULL pointer dereference, address: >> 0040 >> [ 1061.008710] #PF: supervisor read access in

Re: [PATCH 1/1] blk-mq: get ctx in order to handle BLK_MQ_S_INACTIVE in blk_mq_get_tag()

2020-06-03 Thread John Garry
On 02/06/2020 07:17, Dongli Zhang wrote: When scheduler is set, we hit below page fault when we offline cpu. [ 1061.007725] BUG: kernel NULL pointer dereference, address: 0040 [ 1061.008710] #PF: supervisor read access in kernel mode [ 1061.009492] #PF: error_code(0x) -

Re: [PATCH 1/1] blk-mq: get ctx in order to handle BLK_MQ_S_INACTIVE in blk_mq_get_tag()

2020-06-02 Thread Bob Liu
On 6/2/20 2:17 PM, Dongli Zhang wrote: > When scheduler is set, we hit below page fault when we offline cpu. > > [ 1061.007725] BUG: kernel NULL pointer dereference, address: 0040 > [ 1061.008710] #PF: supervisor read access in kernel mode > [ 1061.009492] #PF: error_code(0x) -

Re: [PATCH 1/1] blk-mq: get ctx in order to handle BLK_MQ_S_INACTIVE in blk_mq_get_tag()

2020-06-02 Thread Daniel Wagner
On Mon, Jun 01, 2020 at 11:17:49PM -0700, Dongli Zhang wrote: > When scheduler is set, we hit below page fault when we offline cpu. > > [ 1061.007725] BUG: kernel NULL pointer dereference, address: 0040 > [ 1061.008710] #PF: supervisor read access in kernel mode > [ 1061.009492] #PF:

Re: [PATCH 1/1] blk-mq: get ctx in order to handle BLK_MQ_S_INACTIVE in blk_mq_get_tag()

2020-06-02 Thread Ming Lei
On Mon, Jun 01, 2020 at 11:17:49PM -0700, Dongli Zhang wrote: > When scheduler is set, we hit below page fault when we offline cpu. > > [ 1061.007725] BUG: kernel NULL pointer dereference, address: 0040 > [ 1061.008710] #PF: supervisor read access in kernel mode > [ 1061.009492] #PF:

[PATCH 1/1] blk-mq: get ctx in order to handle BLK_MQ_S_INACTIVE in blk_mq_get_tag()

2020-06-02 Thread Dongli Zhang
When scheduler is set, we hit below page fault when we offline cpu. [ 1061.007725] BUG: kernel NULL pointer dereference, address: 0040 [ 1061.008710] #PF: supervisor read access in kernel mode [ 1061.009492] #PF: error_code(0x) - not-present page [ 1061.010241] PGD 0 P4D 0 [