Hi all, After merging the mm tree, today's linux-next qemu boot test (powerpc pseries_le_defconfig) failed like this: Run /init as init process BUG: Kernel NULL pointer dereference on read at 0x00000008 Faulting instruction address: 0xc000000000468ed0 Oops: Kernel access of bad area, sig: 11 [#1] LE PAGE_SIZE=64K MMU=Hash SMP NR_CPUS=2048 NUMA pSeries Modules linked in: CPU: 0 PID: 1 Comm: init Not tainted 6.4.0-13165-g408ff5108632 #2 Hardware name: IBM pSeries (emulated by qemu) POWER8 (raw) 0x4d0200 0xf000004 of:SLOF,HEAD pSeries NIP: c000000000468ed0 LR: c000000000468410 CTR: 0000000000000000 REGS: c00000000479b960 TRAP: 0300 Not tainted (6.4.0-13165-g408ff5108632) MSR: 8000000000009033 <SF,EE,ME,IR,DR,RI,LE> CR: 24024800 XER: 00000000 CFAR: c00000000000db4c DAR: 0000000000000008 DSISR: 40000000 IRQMASK: 0 GPR00: c000000000468410 c00000000479bc00 c000000001568f00 c0000000041a6180 GPR04: 000000007fff8785 c00000000479bbe0 c00000000479bc98 0000000000000000 GPR08: ff7fffffffffefbf c00000000153cb10 c000000000432860 0000000000002000 GPR12: c00000000445fb08 c000000002b00000 0000000000000000 0000000000000000 GPR16: 0000000000000000 0000000000000000 0000000000000000 0000000000000000 GPR20: 0000000000000000 0000000000000000 c0000000029901a0 c00000000692d000 GPR24: c0000000029901a8 0000000000000075 0000000000000000 c0000000029901b0 GPR28: 0000000000000354 c00000000693fcf0 c00000000693fcf0 0000000000000000 NIP [c000000000468ed0] __handle_mm_fault+0xeb0/0x18a0 LR [c000000000468410] __handle_mm_fault+0x3f0/0x18a0 Call Trace: [c00000000479bc00] [c000000000468410] __handle_mm_fault+0x3f0/0x18a0 (unreliable) [c00000000479bd00] [c000000000469970] handle_mm_fault+0xb0/0x350 [c00000000479bd50] [c0000000000894b4] ___do_page_fault+0x214/0x920 [c00000000479bdf0] [c000000000089c70] hash__do_page_fault+0x30/0xc0 [c00000000479be20] [c0000000000930a4] do_hash_fault+0x1d4/0x330 [c00000000479be50] [c00000000000904c] instruction_access_common_virt+0x20c/0x210 --- interrupt: 400 at 0x7fff878510a0 NIP: 00007fff878510a0 LR: 0000000000000000 CTR: 0000000000000000 REGS: c00000000479be80 TRAP: 0400 Not tainted (6.4.0-13165-g408ff5108632) MSR: 800000004000d033 <SF,EE,PR,ME,IR,DR,RI,LE> CR: 00000000 XER: 00000000 CFAR: c00000000000d7bc IRQMASK: 0 GPR00: 0000000000000000 00007fffeb1b47a0 0000000000000000 0000000000000000 GPR04: 0000000000000000 0000000000000000 0000000000000000 0000000000000000 GPR08: 0000000000000000 0000000000000000 0000000000000000 0000000000000000 GPR12: 00007fff878510a0 0000000000000000 0000000000000000 0000000000000000 GPR16: 0000000000000000 0000000000000000 0000000000000000 0000000000000000 GPR20: 0000000000000000 0000000000000000 0000000000000000 0000000000000000 GPR24: 0000000000000000 0000000000000000 0000000000000000 0000000000000000 GPR28: 0000000000000000 0000000000000000 0000000000000000 0000000000000000 NIP [00007fff878510a0] 0x7fff878510a0 LR [0000000000000000] 0x0 --- interrupt: 400 Code: 73e90973 4082060c 38610038 4bffe5dd 7c7fe378 73e90d73 408205ec 38610038 4bff7ad9 7fff1b78 4bfff728 eb410088 <e95a0008> 71480001 4082078c e9290038 ---[ end trace 0000000000000000 ]--- I don't know what caused this, but reverting the mm tree fixed the failure. So I have done that for today. -- Cheers, Stephen Rothwell
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