Thanks Jiri, I am now able to reproduce it with your new config. I have tried yesterday to enable sparsemem and deferred_struct_init on x86_32, and that kernel booted fine, there must be something else in your config that helps to trigger this problem. I am studying it now. [ 0.051245] Initializing CPU#0 [ 0.051682] Initializing HighMem for node 0 (000367fe:0007ffe0) [ 0.067499] BUG: unable to handle kernel NULL pointer dereference at 00000028 [ 0.068452] *pdpt = 0000000000000000 *pde = f000ff53f000ff53 [ 0.069105] Oops: 0000 [#1] PREEMPT SMP PTI [ 0.069595] CPU: 0 PID: 0 Comm: swapper Not tainted 4.19.0-rc1-pae_pt_jiri #1 [ 0.070382] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.11.0-20171110_100015-anatol 04/01/2014 [ 0.071545] EIP: free_unref_page_prepare.part.70+0x2c/0x50 [ 0.072178] Code: 19 e9 ff 89 d1 55 c1 ea 11 c1 e9 07 8b 14 d5 44 52 fd d6 81 e1 fc 03 00 00 89 e5 56 53 89 cb be 1d 00 00 00 c1 eb 05 83 e1 1f <8b> 14 9a 29 ce 89 f1 d3 ea 83 e2 07 89 50 10 b8 01 00 00 00 5b 5e [ 0.074296] EAX: f4cfa000 EBX: 0000000a ECX: 00000010 EDX: 00000000 [ 0.075005] ESI: 0000001d EDI: 0007ffe0 EBP: d6d41ed0 ESP: d6d41ec8 [ 0.075714] DS: 007b ES: 007b FS: 00d8 GS: 00e0 SS: 0068 EFLAGS: 00210002 [ 0.076508] CR0: 80050033 CR2: 00000028 CR3: 16f20000 CR4: 000406b0 [ 0.077242] DR0: 00000000 DR1: 00000000 DR2: 00000000 DR3: 00000000 [ 0.077934] DR6: fffe0ff0 DR7: 00000400 [ 0.078380] Call Trace: [ 0.078670] free_unref_page+0x3a/0x90 [ 0.079136] __free_pages+0x25/0x30 [ 0.079533] free_highmem_page+0x1e/0x50 [ 0.079978] add_highpages_with_active_regions+0xd1/0x11f [ 0.080592] set_highmem_pages_init+0x67/0x7d [ 0.081076] mem_init+0x30/0x1fc [ 0.081434] start_kernel+0x1cc/0x44c [ 0.081874] i386_start_kernel+0x98/0x9c [ 0.082401] startup_32_smp+0x164/0x168 [ 0.082873] Modules linked in: [ 0.083228] CR2: 0000000000000028 [ 0.083606] ---[ end trace a5990d9ace2ec990 ]--- [ 0.084128] EIP: free_unref_page_prepare.part.70+0x2c/0x50 [ 0.084747] Code: 19 e9 ff 89 d1 55 c1 ea 11 c1 e9 07 8b 14 d5 44 52 fd d6 81 e1 fc 03 00 00 89 e5 56 53 89 cb be 1d 00 00 00 c1 eb 05 83 e1 1f <8b> 14 9a 29 ce 89 f1 d3 ea 83 e2 07 89 50 10 b8 01 00 00 00 5b 5e [ 0.086874] EAX: f4cfa000 EBX: 0000000a ECX: 00000010 EDX: 00000000 [ 0.087581] ESI: 0000001d EDI: 0007ffe0 EBP: d6d41ed0 ESP: d6f27efc [ 0.088287] DS: 007b ES: 007b FS: 00d8 GS: 00e0 SS: 0068 EFLAGS: 00210002 [ 0.089139] CR0: 80050033 CR2: 00000028 CR3: 16f20000 CR4: 000406b0 [ 0.089850] DR0: 00000000 DR1: 00000000 DR2: 00000000 DR3: 00000000 [ 0.090557] DR6: fffe0ff0 DR7: 00000400 [ 0.090992] Kernel panic - not syncing: Attempted to kill the idle task! Pavel On 8/31/18 7:29 AM, Jiri Slaby wrote: > On 08/31/2018, 01:26 PM, Jiri Slaby wrote: >> On 08/30/2018, 05:45 PM, Pasha Tatashin wrote: >>> Hi Jiri, >>> >>> I believe this bug is fixed with this change: >>> >>> d39f8fb4b7776dcb09ec3bf7a321547083078ee3 >>> mm: make DEFERRED_STRUCT_PAGE_INIT explicitly depend on SPARSEMEM >> >> Hi, >> >> it only shifted. Enabling only SPARSEMEM works fine, enabling also >> DEFERRED_STRUCT_PAGE_INIT doesn't even boot – immediately reboots >> (config attached). > > Wow, earlyprintk is up at the moment of crash already: > [ 0.000000] Linux version 4.19.0-rc1-pae (jslaby@kunlun) (gcc version > 4.8.5 (SUSE Linux)) #4 SMP PREEMPT Fri Aug 31 13:18:33 CEST 2018 > [ 0.000000] x86/fpu: x87 FPU will use FXSAVE > [ 0.000000] BIOS-provided physical RAM map: > [ 0.000000] BIOS-e820: [mem 0x0000000000000000-0x000000000009fbff] usable > [ 0.000000] BIOS-e820: [mem 0x000000000009fc00-0x000000000009ffff] > reserved > [ 0.000000] BIOS-e820: [mem 0x00000000000f0000-0x00000000000fffff] > reserved > [ 0.000000] BIOS-e820: [mem 0x0000000000100000-0x000000007cfdffff] usable > [ 0.000000] BIOS-e820: [mem 0x000000007cfe0000-0x000000007cffffff] > reserved > [ 0.000000] BIOS-e820: [mem 0x00000000feffc000-0x00000000feffffff] > reserved > [ 0.000000] BIOS-e820: [mem 0x00000000fffc0000-0x00000000ffffffff] > reserved > [ 0.000000] bootconsole [earlyser0] enabled > [ 0.000000] NX (Execute Disable) protection: active > [ 0.000000] SMBIOS 2.8 present. > [ 0.000000] DMI: QEMU Standard PC (i440FX + PIIX, 1996), BIOS > 1.0.0-prebuilt.qemu-project.org 04/01/2014 > [ 0.000000] Hypervisor detected: KVM > [ 0.000000] kvm-clock: Using msrs 4b564d01 and 4b564d00 > [ 0.000002] kvm-clock: cpu 0, msr 1d12c001, primary cpu clock > [ 0.000002] kvm-clock: using sched offset of 1597117996 cycles > [ 0.001395] clocksource: kvm-clock: mask: 0xffffffffffffffff > max_cycles: 0x1cd42e4dffb, max_idle_ns: 881590591483 ns > [ 0.006245] tsc: Detected 2808.000 MHz processor > [ 0.010055] last_pfn = 0x7cfe0 max_arch_pfn = 0x1000000 > [ 0.011483] x86/PAT: PAT not supported by CPU. > [ 0.012580] x86/PAT: Configuration [0-7]: WB WT UC- UC WB WT UC- > UC > [ 0.020644] found SMP MP-table at [mem 0x000f5d20-0x000f5d2f] mapped > at [(ptrval)] > [ 0.023528] Scanning 1 areas for low memory corruption > [ 0.025047] ACPI: Early table checksum verification disabled > [ 0.026581] ACPI: RSDP 0x00000000000F5B40 000014 (v00 BOCHS ) > [ 0.028031] ACPI: RSDT 0x000000007CFE157C 000030 (v01 BOCHS BXPCRSDT > 00000001 BXPC 00000001) > [ 0.029996] ACPI: FACP 0x000000007CFE1458 000074 (v01 BOCHS BXPCFACP > 00000001 BXPC 00000001) > [ 0.032234] ACPI: DSDT 0x000000007CFE0040 001418 (v01 BOCHS BXPCDSDT > 00000001 BXPC 00000001) > [ 0.034662] ACPI: FACS 0x000000007CFE0000 000040 > [ 0.036126] ACPI: APIC 0x000000007CFE14CC 000078 (v01 BOCHS BXPCAPIC > 00000001 BXPC 00000001) > [ 0.038235] ACPI: HPET 0x000000007CFE1544 000038 (v01 BOCHS BXPCHPET > 00000001 BXPC 00000001) > [ 0.040373] No NUMA configuration found > [ 0.041407] Faking a node at [mem 0x0000000000000000-0x000000007cfdffff] > [ 0.043306] NODE_DATA(0) allocated [mem 0x367fc000-0x367fcfff] > [ 0.044958] 1127MB HIGHMEM available. > [ 0.045940] 871MB LOWMEM available. > [ 0.046978] mapped low ram: 0 - 367fe000 > [ 0.048200] low ram: 0 - 367fe000 > [ 0.050830] Zone ranges: > [ 0.051625] DMA [mem 0x0000000000001000-0x0000000000ffffff] > [ 0.053295] Normal [mem 0x0000000001000000-0x00000000367fdfff] > [ 0.054921] HighMem [mem 0x00000000367fe000-0x000000007cfdffff] > [ 0.056408] Movable zone start for each node > [ 0.057452] Early memory node ranges > [ 0.058377] node 0: [mem 0x0000000000001000-0x000000000009efff] > [ 0.059946] node 0: [mem 0x0000000000100000-0x000000007cfdffff] > [ 0.061825] Reserved but unavailable: 12418 pages > [ 0.061828] Initmem setup node 0 [mem > 0x0000000000001000-0x000000007cfdffff] > [ 0.074252] Using APIC driver default > [ 0.075615] ACPI: PM-Timer IO Port: 0x608 > [ 0.076574] ACPI: LAPIC_NMI (acpi_id[0xff] dfl dfl lint[0x1]) > [ 0.077995] IOAPIC[0]: apic_id 0, version 17, address 0xfec00000, GSI > 0-23 > [ 0.079610] ACPI: INT_SRC_OVR (bus 0 bus_irq 0 global_irq 2 dfl dfl) > [ 0.081111] ACPI: INT_SRC_OVR (bus 0 bus_irq 5 global_irq 5 high level) > [ 0.082786] ACPI: INT_SRC_OVR (bus 0 bus_irq 9 global_irq 9 high level) > [ 0.084297] ACPI: INT_SRC_OVR (bus 0 bus_irq 10 global_irq 10 high level) > [ 0.085933] ACPI: INT_SRC_OVR (bus 0 bus_irq 11 global_irq 11 high level) > [ 0.087729] Using ACPI (MADT) for SMP configuration information > [ 0.089119] ACPI: HPET id: 0x8086a201 base: 0xfed00000 > [ 0.090351] smpboot: Allowing 1 CPUs, 0 hotplug CPUs > [ 0.091561] PM: Registered nosave memory: [mem 0x00000000-0x00000fff] > [ 0.093361] PM: Registered nosave memory: [mem 0x0009f000-0x0009ffff] > [ 0.096382] PM: Registered nosave memory: [mem 0x000a0000-0x000effff] > [ 0.098130] PM: Registered nosave memory: [mem 0x000f0000-0x000fffff] > [ 0.099729] [mem 0x7d000000-0xfeffbfff] available for PCI devices > [ 0.101034] Booting paravirtualized kernel on KVM > [ 0.102034] clocksource: refined-jiffies: mask: 0xffffffff > max_cycles: 0xffffffff, max_idle_ns: 7645519600211568 ns > [ 0.104207] random: get_random_bytes called from > start_kernel+0x77/0x47c with crng_init=0 > [ 0.105913] setup_percpu: NR_CPUS:64 nr_cpumask_bits:64 nr_cpu_ids:1 > nr_node_ids:1 > [ 0.107548] percpu: Embedded 31 pages/cpu @(ptrval) s94604 r0 d32372 > u126976 > [ 0.109019] KVM setup async PF for cpu 0 > [ 0.109825] kvm-stealtime: cpu 0, msr 367e5300 > [ 0.110755] Built 1 zonelists, mobility grouping on. Total pages: 509908 > [ 0.112113] Policy zone: HighMem > [ 0.112755] Kernel command line: earlyprintk=serial > [ 0.113773] Dentry cache hash table entries: 131072 (order: 7, 524288 > bytes) > [ 0.115788] Inode-cache hash table entries: 65536 (order: 6, 262144 > bytes) > [ 0.117465] Initializing CPU#0 > [ 0.118522] Initializing HighMem for node 0 (000367fe:0007cfe0) > [ 0.161140] BUG: unable to handle kernel NULL pointer dereference at > 00000028 > [ 0.162671] *pdpt = 0000000000000000 *pde = f000ff53f000ff53 > [ 0.163857] Oops: 0000 [#1] PREEMPT SMP PTI > [ 0.164862] CPU: 0 PID: 0 Comm: swapper Not tainted 4.19.0-rc1-pae #4 > openSUSE Tumbleweed (unreleased) > [ 0.167041] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), > BIOS 1.0.0-prebuilt.qemu-project.org 04/01/2014 > [ 0.169389] EIP: free_unref_page_prepare.part.75+0x26/0x50 > [ 0.170337] Code: 00 00 00 00 e8 e7 a4 e9 ff 89 d1 c1 ea 11 55 8b 14 > d5 84 d2 1c dd c1 e9 07 89 e5 56 81 e1 fc 03 00 00 53 89 cb c1 eb 05 89 > ce <8b> 14 9a 83 e6 1f b9 1d 00 00 00 29 f1 d3 ea 83 e2 07 89 50 10 b8 > [ 0.174205] EAX: f4cfa000 EBX: 0000000a ECX: 00000150 EDX: 00000000 > [ 0.175422] ESI: 00000150 EDI: 00d80000 EBP: dcf2be50 ESP: dcf2be48 > [ 0.176724] DS: 007b ES: 007b FS: 00d8 GS: 00e0 SS: 0068 EFLAGS: 00210007 > [ 0.178075] CR0: 80050033 CR2: 00000028 CR3: 1d118000 CR4: 000006b0 > [ 0.179354] DR0: 00000000 DR1: 00000000 DR2: 00000000 DR3: 00000000 > [ 0.180629] DR6: fffe0ff0 DR7: 00000400 > [ 0.181400] Call Trace: > [ 0.181907] free_unref_page+0x3a/0x90 > [ 0.182642] __free_pages+0x25/0x30 > [ 0.183748] free_highmem_page+0x1e/0x50 > [ 0.184594] add_highpages_with_active_regions+0x123/0x125 > [ 0.185813] set_highmem_pages_init+0x83/0x8d > [ 0.186847] mem_init+0x26/0x240 > [ 0.187590] ? vprintk_func+0x38/0xd0 > [ 0.188427] ? idt_setup_from_table.constprop.1+0x45/0x70 > [ 0.189666] ? set_intr_gate+0x39/0x40 > [ 0.190551] ? general_protection+0xc/0xc > [ 0.191818] ? update_intr_gate+0x1e/0x20 > [ 0.192817] ? kvm_apf_trap_init+0x17/0x19 > [ 0.193800] ? trap_init+0x77/0x7d > [ 0.194644] start_kernel+0x203/0x47c > [ 0.195491] ? set_init_arg+0x57/0x57 > [ 0.196385] i386_start_kernel+0x143/0x146 > [ 0.197351] startup_32_smp+0x164/0x168 > [ 0.198232] Modules linked in: > [ 0.199072] CR2: 0000000000000028 > [ 0.199983] ---[ end trace 69f4a864c8bd9bcd ]--- > [ 0.201198] EIP: free_unref_page_prepare.part.75+0x26/0x50 > [ 0.202610] Code: 00 00 00 00 e8 e7 a4 e9 ff 89 d1 c1 ea 11 55 8b 14 > d5 84 d2 1c dd c1 e9 07 89 e5 56 81 e1 fc 03 00 00 53 89 cb c1 eb 05 89 > ce <8b> 14 9a 83 e6 1f b9 1d 00 00 00 29 f1 d3 ea 83 e2 07 89 50 10 b8 > [ 0.206942] EAX: f4cfa000 EBX: 0000000a ECX: 00000150 EDX: 00000000 > [ 0.208177] ESI: 00000150 EDI: 00d80000 EBP: dcf2be50 ESP: dd11fefc > [ 0.209438] DS: 007b ES: 007b FS: 00d8 GS: 00e0 SS: 0068 EFLAGS: 00210007 > [ 0.210826] CR0: 80050033 CR2: 00000028 CR3: 1d118000 CR4: 000006b0 > [ 0.212155] DR0: 00000000 DR1: 00000000 DR2: 00000000 DR3: 00000000 > [ 0.213752] DR6: fffe0ff0 DR7: 00000400 > > >> >> thanks, >> > >
