On Thu, Mar 7, 2013 at 10:32 PM, Yinghai Lu <yinghai at kernel.org> wrote: > On Thu, Mar 7, 2013 at 10:03 PM, CAI Qian <caiqian at redhat.com> wrote: >> CC'ing kexec ML. Also mentioned that 3.8 has no such issue. >> >> This message looks suspicious and out of range while 3.8 reservation >> looks within the range. >> >> [ 0.000000] Reserving 128MB of memory at 5216MB for crashkernel >> (System RAM: 3977MB) >> >> Wondering if anything to do with memblock again... > > that is intended... > >> ----- Original Message ----- >>> From: "WANG Chao" <chaowang at redhat.com> >>> To: "LKML" vger.kernel.org> >>> Cc: "CAI Qian" <caiqian at redhat.com> >>> Sent: Friday, March 8, 2013 1:54:37 PM >>> Subject: 3.9-rc1: crash kernel panic - not syncing: Can not allocate SWIOTLB buffer earlier and can't now provide you >>> with the DMA bounce buffer >>> >>> Hi, All >>> >>> On 3.9-rc1, I load crash kernel with latest kexec-tools(up to >>> 28d413a), but >>> 2nd kernel panic at early time: >>> [ 2.948076] Kernel panic - not syncing: Can not allocate SWIOTLB >>> buffer earlier and can't now provide you with the DMA bounce buffer >>> [ 2.959958] Pid: 53, comm: khubd Not tainted 3.9.0-rc1+ #1 > > You need to add crashkernel_low=64M in first kernel. > > As your system does not support DMA remapping. looks like your system DO have DMAR table, please enable dmar remapping in your kernel config. Yinghai
