Hello Josh, Le 29/02/2016 06:18, Josh Cartwright a écrit : > I think your best bet will be to try to get early console output, with > the hope that you can get visibility into what is going wrong. I'm sure > there are many tutorials out there on how to build a kernel with this > serial debugging information. Do a search for DEBUG_LL, earlyprintk, > and perhaps earlycon; these are not -rt specific. Thanks for your advice. I managed to obtain earlyprintk, this is what I got: Uncompressing Linux... done, booting the kernel. Booting Linux on physical CPU 0x0 Linux version 4.4.3-rt9 (jdg@xxxxxxxxxxxxxxx) (gcc version 5.2.1 20151104 (Red Hat Cross 5.2.1-4) (GCC) ) #10 PREEMPT RT Mon Feb 29 13:01:47 TAHT 2016 CPU: ARM926EJ-S [41069265] revision 5 (ARMv5TEJ), cr=0005317f CPU: VIVT data cache, VIVT instruction cache Machine model: Acme Systems Arietta G25 bootconsole [earlycon0] enabled Memory policy: Data cache writeback On node 0 totalpages: 32768 free_area_init_node: node 0, pgdat c0556448, node_mem_map c7ef9000 Normal zone: 256 pages used for memmap Normal zone: 0 pages reserved Normal zone: 32768 pages, LIFO batch:7 pcpu-alloc: s0 r0 d32768 u32768 alloc=1*32768 pcpu-alloc: [0] 0 Built 1 zonelists in Zone order, mobility grouping on. Total pages: 32512 Kernel command line: mem=128M console=ttyS0,115200 root=/dev/mmcblk0p2 rootdelay=1 earlyprintk=ttyS0,115200 PID hash table entries: 512 (order: -1, 2048 bytes) Dentry cache hash table entries: 16384 (order: 4, 65536 bytes) Inode-cache hash table entries: 8192 (order: 3, 32768 bytes) Memory: 124180K/131072K available (3870K kernel code, 139K rwdata, 1256K rodata, 168K init, 137K bss, 6892K reserved, 0K cma-reserved) Virtual kernel memory layout: vector : 0xffff0000 - 0xffff1000 ( 4 kB) fixmap : 0xffc00000 - 0xfff00000 (3072 kB) vmalloc : 0xc8800000 - 0xff800000 ( 880 MB) lowmem : 0xc0000000 - 0xc8000000 ( 128 MB) modules : 0xbf000000 - 0xc0000000 ( 16 MB) .text : 0xc0008000 - 0xc0509c3c (5128 kB) .init : 0xc050a000 - 0xc0534000 ( 168 kB) .data : 0xc0534000 - 0xc0556d40 ( 140 kB) .bss : 0xc0556d40 - 0xc05793a8 ( 138 kB) SLUB: HWalign=32, Order=0-3, MinObjects=0, CPUs=1, Nodes=1 Preemptible hierarchical RCU implementation. Build-time adjustment of leaf fanout to 32. NR_IRQS:16 nr_irqs:16 16 Unable to handle kernel NULL pointer dereference at virtual address 00000000 pgd = c0004000 [00000000] *pgd=00000000 Internal error: Oops: 5 [#1] PREEMPT ARM Modules linked in: CPU: 0 PID: 0 Comm: swapper Not tainted 4.4.3-rt9 #10 Hardware name: Atmel AT91SAM9 task: c0537dd0 ti: c0534000 task.ti: c0534000 PC is at try_to_wake_up+0x34/0x228 LR is at kthread_create_on_node+0x94/0x134 pc : [<c0030dfc>] lr : [<c002d084>] psr: 600000d3 sp : c0535ea0 ip : c7802264 fp : c0535ebc r10: 00000010 r9 : c0040f80 r8 : 00000000 r7 : 00000000 r6 : 600000d3 r5 : 00000000 r4 : c7805060 r3 : c0534000 r2 : 00000002 r1 : 00000003 r0 : 00000000 Flags: nZCv IRQs off FIQs off Mode SVC_32 ISA ARM Segment none Control: 0005317f Table: 20004000 DAC: 00000053 Process swapper (pid: 0, stack limit = 0xc0534190) Stack: (0xc0535ea0 to 0xc0536000) 5ea0: c7805060 c053aed4 c0535ec4 00000000 c7803080 c0040f80 c7ee5830 c002d084 5ec0: c0040f80 00000000 c0535ec8 c0535ec8 c7803080 c7803080 00000000 c0040144 5ee0: 00000010 c7803040 c0040668 c048dd00 00000010 c04bdd54 c03fb3d0 00000032 5f00: 00000000 c7803080 c7804cc0 c0041634 00000010 c7804cc0 00040080 c7803080 5f20: c7804cc0 c031ca74 00000000 c7803040 00000010 c0041c3c c7803040 c7ee5830 5f40: c7803048 c03fb3d0 fefffc00 c0570f50 00000010 c0520640 c04bdd54 c7803040 5f60: 00000000 c0535f88 c78050a0 00000001 c7805080 00000000 00000200 c05202bc 5f80: 00000000 00000000 c7805088 c78050a8 00000000 00000000 c0556e00 ffffffff 5fa0: c0536000 c7ee4020 c05298bc 20528248 00000000 c050c108 00000000 c050aafc 5fc0: ffffffff ffffffff 00000000 c050a66c 00000000 c05298bc 00000000 c0556f54 5fe0: c0536018 c05298b8 c0538d04 20004000 41069265 20008048 00000000 00000000 [<c0030dfc>] (try_to_wake_up) from [<c002d084>] (kthread_create_on_node+0x94/0x134) [<c002d084>] (kthread_create_on_node) from [<c0040668>] (setup_irq_thread+0x38/0xd4) [<c0040668>] (setup_irq_thread) from [<c0041634>] (__setup_irq+0x1a8/0x648) [<c0041634>] (__setup_irq) from [<c0041c3c>] (request_threaded_irq+0xe4/0x144) [<c0041c3c>] (request_threaded_irq) from [<c0520640>] (of_at91_pmc_setup+0xe0/0x16c) [<c0520640>] (of_at91_pmc_setup) from [<c05202bc>] (of_clk_init+0xf4/0x1b8) [<c05202bc>] (of_clk_init) from [<c050c108>] (time_init+0x20/0x2c) [<c050c108>] (time_init) from [<c050aafc>] (start_kernel+0x248/0x35c) [<c050aafc>] (start_kernel) from [<20008048>] (0x20008048) Code: e3c3303f e5932004 e2822001 e5832004 (e5902000) ---[ end trace 0000000000000001 ]--- Kernel panic - not syncing: Attempted to kill the idle task! I have no clue at what is wrong, and hope it makes sense to someone. Should I send this trace under another subject? Best regards -- Jean-Denis Girard SysNux Systèmes Linux en Polynésie française http://www.sysnux.pf/ Tél: +689 40.50.10.40 / GSM: +689 87.79.75.27
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