"Aneesh Kumar K.V" <aneesh.ku...@linux.ibm.com> writes: > Romain Dolbeau <rom...@dolbeau.org> writes: > >> Le sam. 21 déc. 2019 à 05:31, Aneesh Kumar K.V >> <aneesh.ku...@linux.ibm.com> a écrit : >>> I don't have direct access to this system, I have asked if we can get a run >>> with 64K. >> >> OK, thanks! Do you know which model it is? It seems to be working on >> some systems, >> but we don't have enough samples to figure out why at this time, I think. >> >>> Meanwhile is there a way to find out what caused MachineCheck? more >>> details on this? I was checking the manual and I don't see any >>> restrictions w.r.t effective address. We now have very high EA with 64K >>> page size. >> >> Sorry, no idea, completely out of my depth here. I can try some kernel >> (build, runtime) options and/or patch, but someone will have to tell >> me what to try, >> as I have no ideas. > > > Can you try this change. > > modified arch/powerpc/include/asm/book3s/64/mmu-hash.h > @@ -580,7 +580,7 @@ extern void slb_set_size(u16 size); > #if (MAX_PHYSMEM_BITS > MAX_EA_BITS_PER_CONTEXT) > #define MAX_KERNEL_CTX_CNT (1UL << (MAX_PHYSMEM_BITS - > MAX_EA_BITS_PER_CONTEXT)) > #else > -#define MAX_KERNEL_CTX_CNT 1 > +#define MAX_KERNEL_CTX_CNT 4 > #endif
Didn't help. Same crash, here's a previous one OCR'ed from a photo: Oops: Machine check, sig: 7 [#1] BE PAGE SIZE-64 MMU-Hash SMP NR_CPUS 4 NUMA PowerMac Modules linked in: CPU: PID: 1 Comn: init Tainted: G M 5.5.0-rc4-gcc-8.2.0-00919-g443b9413a05e #1465 NIP: c00000000026f528 LR: c000000000296138 CTR: 0000000000000000 REGS: ce0000000ffa3d70 TRAP: 0200 Tainted: G M (5.5.0-rc-gcc-8.2.0-00919-g443b9413a05e) MSR: 9000000000109032 <SF, HV, EE, ME, IR, DR, RI> CR: 24282048 XER: 00000000 DAR: c00c000000612c80 DSISR: 00000400 IRQ MASK: 8 GPR00: c0000000002970d0 c0000001bc343a90 c000000001399600 c0000001bc01c800 GPR04: ce000001bc390000 ce000001bc3439d4 c0000001bc343a9c c0000001bb4b73b8 GPR08: c0000001bc320000 0000000000612c78 c000000001442a98 0000000000000fe0 GPR12: 7f7f7f7f7f7f7f7f c0000000016a0000 0000000000000000 00000000f7df38c8 GPR16: 0000000000000002 0000000000000000 00000000ffb14bac 00000000f7df5690 GPRZ0: 00000000f7df26c4 000000000000000d 0000000000008000 00000000f7ddfc0c GPR24: ffffffffffffff9c 0000000000000010 0000000000000002 c0000001bc343db8 GPR28: c000000000296138 c00c000000612c78 c0000001bc390000 c0000001bc01c800 NIP [c0000000626f528] .kmem_cache_free+8x58/0x140 LR [c000000000296138] .putname.0x08/0xa Call Trace: c0000001bc343b40 [c000000000296138] .putname+0x88/0xa0 c0000001bc343bc0 [c0000000002970d0] .filename_lookup.part.76+0xb0/0x160 ce000001bc343d40 [c000008000279b20] .do_faccessat+0xe0/0x380 c0000001bc343e20 [c00000000000a40c] systen_call+0x5c/0x68 Instruction dump: 408201e8 2fa30000 419e0080 fb8100c0 fb4100080 fb610088 789d8502 3d22000b 39499498 1d3d0038 ebaa0000 7fbd4a14 <e93d0008> 712a0001 40820240 3422001e cheers
