[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] Linux 4.4 MW: Boot under Xen fails with CONFIG_DEBUG_WX enabled: RIP: ptdump_walk_pgd_level_core
On 2015-11-04 19:06, Ingo Molnar wrote: * Stephen Smalley <sds@xxxxxxxxxxxxx> wrote:On 11/04/2015 06:55 AM, Sander Eikelenboom wrote: >Hi All, > >I just tried to boot with the current linus mergewindow tree under Xen. >It fails with a kernel panic at boot with the new "CONFIG_DEBUG_WX" >option enabled. >Disabling it makes the kernel boot fine. > >The splat: >[ 18.424241] Freeing unused kernel memory: 1104K (ffffffff822fc000 - >ffffffff82410000) >[ 18.430314] Write protecting the kernel read-only data: 18432k >[ 18.441054] Freeing unused kernel memory: 1144K (ffff880001ae2000 - >ffff880001c00000) >[ 18.447966] Freeing unused kernel memory: 1560K (ffff88000207a000 - >ffff880002200000) >[ 18.453947] BUG: unable to handle kernel paging request at >ffff88055c883000 >[ 18.459943] IP: [<ffffffff8105af8e>] >ptdump_walk_pgd_level_core+0x20e/0x440 >[ 18.465847] PGD 2212067 PUD 0 >[ 18.471564] Oops: 0000 [#1] SMP >[ 18.477248] Modules linked in: >[ 18.482918] CPU: 2 PID: 1 Comm: swapper/0 Not tainted >4.3.0-mw-20151104-linus-doflr+ #1 >[ 18.488804] Hardware name: MSI MS-7640/890FXA-GD70 (MS-7640) , BIOS >V1.8B1 09/13/2010 >[ 18.494778] task: ffff880059b90000 ti: ffff880059b98000 task.ti: >ffff880059b98000 >[ 18.500852] RIP: e030:[<ffffffff8105af8e>] [<ffffffff8105af8e>] >ptdump_walk_pgd_level_core+0x20e/0x440It would be nice to see which line of code this corresponds to. Doing this:gdb vmlinux list *0xffffffff8105af8e should normally do the trick. Thanks, Ingo Hi Ingo, (gdb) list *0xffffffff8105af8e0xffffffff8105af8e is in ptdump_walk_pgd_level_core (arch/x86/mm/dump_pagetables.c:181). warning: Source file is more recent than executable. 176 * On 64 bits, sign-extend the 48 bit address to 64 bit 177 */ 178 static unsigned long normalize_addr(unsigned long u) 179 { 180 #ifdef CONFIG_X86_64 181 return (signed long)(u << 16) >> 16; 182 #else 183 return u; 184 #endif 185 } -- Sander _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx http://lists.xen.org/xen-devel
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