On 6/8/21 7:58 PM, Ming Lei wrote: > Hello, > > Yi reported several kernel panics on: > > [16687.001777] Unable to handle kernel NULL pointer dereference at virtual address 0000000000000008 > ... > [16687.163549] pc : __rq_qos_track+0x38/0x60 > > or > > [ 997.690455] Unable to handle kernel NULL pointer dereference at virtual address 0000000000000020 > ... > [ 997.850347] pc : __rq_qos_done+0x2c/0x50 > > Turns out it is caused by race between adding wbt and normal IO. > > Fix the issue by freezing request queue when adding/deleting rq qos. Applied, thanks. -- Jens Axboe
