On Tue, Aug 5, 2014 at 9:59 AM, Fengguang Wu fengguang.wu@intel.com wrote:

Hello,

This is an old BUG that still lives in linux-next.

[ 4.284620] device id = 2670 [ 4.286157] SBC-GXx flash: IO:0x258-0x259 MEM:0xdc000-0xdffff [ 4.287060] ------------[ cut here ]------------ [ 4.287722] kernel BUG at include/linux/mtd/map.h:148! [ 4.288048] invalid opcode: 0000 [#1] PREEMPT SMP [ 4.288048] CPU 1 [ 4.288048] Pid: 1, comm: swapper/0 Not tainted 3.5.0-rc4-00162-g49099c4 #17 Bochs Bochs [ 4.288048] RIP: 0010:[<ffffffff8177e8de>] [<ffffffff8177e8de>] mtd_do_chip_probe+0x1d/0x1f [ 4.288048] RSP: 0018:ffff880011049e20 EFLAGS: 00010246 [ 4.288048] RAX: 0000000000000000 RBX: ffffffff82a23550 RCX: 0000000000000000 [ 4.288048] RDX: ffff880011049e20 RSI: ffffffff82a23580 RDI: ffff880011049e80 [ 4.288048] RBP: ffff880011049e80 R08: 0000000000000003 R09: ffffffff810d6c93 [ 4.288048] R10: 0000000000000000 R11: 0000000000000001 R12: ffffffff82a23eb0 [ 4.288048] R13: ffffffff828790ce R14: 0000000000000000 R15: 0000000000000000 [ 4.288048] FS: 0000000000000000(0000) GS:ffff880012600000(0000) knlGS:0000000000000000 [ 4.288048] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b [ 4.288048] CR2: 0000000000000000 CR3: 000000000298c000 CR4: 00000000000406e0 [ 4.288048] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 4.288048] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 [ 4.288048] Process swapper/0 (pid: 1, threadinfo ffff880011048000, task ffff880011040000) [ 4.288048] Stack: [ 4.288048] 0000000000000000 0000000000000000 0000000000000000 0000000000000000 [ 4.288048] 0000000000000000 0000000000000000 0000000000000000 0000000000000000 [ 4.288048] 0000000000000000 0000000000000000 0000000000000000 0000000000000000 [ 4.288048] Call Trace: [ 4.288048] [<ffffffff81779e05>] cfi_probe+0x15/0x17 [ 4.288048] [<ffffffff81779d9b>] do_map_probe+0xa0/0xac [ 4.288048] [<ffffffff834d1aac>] ? physmap_init+0x12/0x12 [ 4.288048] [<ffffffff834d1bb0>] init_sbc_gxx+0x104/0x15b [ 4.288048] [<ffffffff8348d1b3>] do_one_initcall+0x86/0x208 [ 4.288048] [<ffffffff8348d442>] kernel_init+0x10d/0x1c2 [ 4.288048] [<ffffffff8348c739>] ? do_early_param+0xc3/0xc3 [ 4.288048] [<ffffffff8207b2f4>] kernel_thread_helper+0x4/0x10 [ 4.288048] [<ffffffff820797b4>] ? retint_restore_args+0x13/0x13 [ 4.288048] [<ffffffff8348d335>] ? do_one_initcall+0x208/0x208 [ 4.288048] [<ffffffff8207b2f0>] ? gs_change+0x13/0x13 [ 4.288048] Code: 83 c4 58 5b 41 5c 41 5d 41 5e 41 5f 5d c3 55 48 89 e5 48 83 ec 60 66 66 66 66 90 31 c0 b9 18 00 00 00 48 8d 55 a0 48 89 d7 f3 ab <0f> 0b 55 48 89 e5 66 66 66 66 90 48 c7 c6 a0 39 a2 82 e8 cc ff [ 4.288048] RIP [<ffffffff8177e8de>] mtd_do_chip_probe+0x1d/0x1f [ 4.288048] RSP <ffff880011049e20> [ 4.321423] ---[ end trace 169195d5d1f9be6e ]--- [ 4.322118] swapper/0 (1) used greatest stack depth: 3768 bytes left

This script may reproduce the error.

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#!/bin/bash

kernel=$1 initrd=quantal-core-x86_64.cgz

wget --no-clobber https://github.com/fengguang/reproduce-kernel-bug/raw/master/initrd/$initrd

kvm=( qemu-system-x86_64 -enable-kvm -cpu Haswell,+smep,+smap -kernel $kernel -initrd $initrd -m 320 -smp 2 -net nic,vlan=1,model=e1000 -net user,vlan=1 -boot order=nc -no-reboot -watchdog i6300esb -rtc base=localtime -serial stdio -display none -monitor null )

append=( hung_task_panic=1 earlyprintk=ttyS0,115200 debug apic=debug sysrq_always_enabled rcupdate.rcu_cpu_stall_timeout=100 panic=10 softlockup_panic=1 nmi_watchdog=panic prompt_ramdisk=0 console=ttyS0,115200 console=tty0 vga=normal root=/dev/ram0 rw drbd.minor_count=8 )

"${kvm[@]}" --append "${append[*]}"

Thanks, Fengguang

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LKP mailing list LKP@linux.intel.com

I am new , here and will try to trace your issue on linus's tree unless there is a major difference between Linus's tree and linux-next. If there is please let me known before I start tracing this. Best Regards , Nick