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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] Linux 4.8-rc8 with Xen for-linus-4.9 branch: dom0 crashes on boot
On 2016-10-02 14:08, Andrew Cooper wrote: On 02/10/2016 12:46, Sander Eikelenboom wrote:Hi All, Since the new merge window is emerging I took the liberty of testing a linux 4.8-rc8 tree with the Xen for-linus-4.9 branch pulled on top. Unfortunately this crashes dom0 early in boot under Xen. On bare-metal the same kernel boots fine. Under Xen a linux 4.8-rc8 kernel without the Xen branch pulled on top, also boots fine.So this looks to be a regression in the Xen for-linux-4.9 branch.Hypervisor is a recentish xen-unstable build. The serial log is below. <snip> (XEN) [2016-10-02 11:31:53.106] Scrubbing Free RAM on 1 nodes using 6 CPUs (XEN) [2016-10-02 11:31:53.217] .............................done. (XEN) [2016-10-02 11:31:56.242] Initial low memory virq threshold set at 0x4000 pages. (XEN) [2016-10-02 11:31:56.260] Std. Loglevel: All (XEN) [2016-10-02 11:31:56.277] Guest Loglevel: All (XEN) [2016-10-02 11:31:56.295] Xen is relinquishing VGA console. (XEN) [2016-10-02 11:31:56.396] *** Serial input -> DOM0 (type 'CTRL-a' three times to switch input to Xen) (XEN) [2016-10-02 11:31:56.396] Freed 308kB init memory (XEN) [2016-10-02 11:31:56.397] d0v0: unhandled page fault (ec=0000) (XEN) [2016-10-02 11:31:56.397] Pagetable walk from 0000000000000001: (XEN) [2016-10-02 11:31:56.397] L4[0x000] = 0000000000000000 ffffffffffffffff (XEN) [2016-10-02 11:31:56.397] domain_crash_sync called from entry.S: fault at ffff82d080244960 entry.o#create_bounce_frame+0x145/0x154 (XEN) [2016-10-02 11:31:56.397] Domain 0 (vcpu#0) crashed on cpu#0: (XEN) [2016-10-02 11:31:56.397] ----[ Xen-4.8-unstable x86_64 debug=y Not tainted ]---- (XEN) [2016-10-02 11:31:56.397] CPU: 0 (XEN) [2016-10-02 11:31:56.397] RIP: e033:[<ffffffff8101fdb9>] (XEN) [2016-10-02 11:31:56.397] RFLAGS: 0000000000000286 EM: 1 CONTEXT: pv guest (d0v0) (XEN) [2016-10-02 11:31:56.397] rax: 0000000000000000 rbx: ffffffff82248bb0 rcx: ffffffff8101bc10 (XEN) [2016-10-02 11:31:56.397] rdx: 0000000000000001 rsi: ffffffff81f0aa50 rdi: ffffffff82248bb0 (XEN) [2016-10-02 11:31:56.397] rbp: ffffffff82203e50 rsp: ffffffff82203dc0 r8: ffffffff8101b550 (XEN) [2016-10-02 11:31:56.397] r9: 0000000000000000 r10: 0000000000000000 r11: 0000000080802001 (XEN) [2016-10-02 11:31:56.397] r12: 0000000000000000 r13: 0000000000000000 r14: ffffffff82215580 (XEN) [2016-10-02 11:31:56.397] r15: 0000000000000000 cr0: 000000008005003b cr4: 00000000000006e0 (XEN) [2016-10-02 11:31:56.397] cr3: 000000054a601000 cr2: 0000000000000001 (XEN) [2016-10-02 11:31:56.397] ds: 0000 es: 0000 fs: 0000 gs: 0000 ss: e02b cs: e033 (XEN) [2016-10-02 11:31:56.397] Guest stack trace from rsp=ffffffff82203dc0: (XEN) [2016-10-02 11:31:56.397] ffffffff8101bc10 0000000080802001 0000000000000000 ffffffff8101fdb9 (XEN) [2016-10-02 11:31:56.397] 000000010000e030 0000000000010086 ffffffff82203e00 000000000000e02b (XEN) [2016-10-02 11:31:56.397] ffffffff82203e50 ffffffff8101fcb5 0000000080802001 0000000000000000 (XEN) [2016-10-02 11:31:56.397] 0000000000000000 ffffffff8101b550 ffffffff82248bb0 ffffffff81f0aa50 (XEN) [2016-10-02 11:31:56.397] 0000000000000001 ffffffff8101bc10 ffffffff82203eb8 ffffffff81b7e9f4 (XEN) [2016-10-02 11:31:56.397] 0000000000000000 ffffffff82203ea8 0000000080802001 0000000000000004 (XEN) [2016-10-02 11:31:56.397] ffffffff8101baa2 ffffffff82203f40 ffffffff82248bb0 0000000000000000 (XEN) [2016-10-02 11:31:56.397] 0000000000000000 ffffffff8101bc10 0000000000000000 ffffffff82203ed0 (XEN) [2016-10-02 11:31:56.397] ffffffff81b7ed45 0000000000000013 ffffffff82203ee0 ffffffff810cc127 (XEN) [2016-10-02 11:31:56.397] ffffffff82203f28 ffffffff810ccdab ffffffff81f0aa50 ffffffff8101b550 (XEN) [2016-10-02 11:31:56.397] ffffffff82203f60 ffffffff82203f5c 0000000000000000 0000000000000000 (XEN) [2016-10-02 11:31:56.397] 0000000000000000 ffffffff82203f40 ffffffff810c83be ffffffff82600000 (XEN) [2016-10-02 11:31:56.397] ffffffff82203ff8 ffffffff8232946a 00100fa000000000 8080200100060800 (XEN) [2016-10-02 11:31:56.397] 000000001789c3f5 0000000000000000 0000000000000000 0000000000000000 (XEN) [2016-10-02 11:31:56.397] 0000000000000000 0000000000000000 0000000000000000 0000000000000000 (XEN) [2016-10-02 11:31:56.397] 0000000000000000 0000000000000000 0000000000000000 0000000000000000 (XEN) [2016-10-02 11:31:56.397] 0000000000000000 0000000000000000 0000000000000000 0000000000000000 (XEN) [2016-10-02 11:31:56.397] 0000000000000000 0000000000000000 0000000000000000 0000000000000000 (XEN) [2016-10-02 11:31:56.397] 0f00000060c0c748 ccccccccccccc305 cccccccccccccccc cccccccccccccccc (XEN) [2016-10-02 11:31:56.397] cccccccccccccccc cccccccccccccccc cccccccccccccccc cccccccccccccccc (XEN) [2016-10-02 11:31:56.397] Hardware Dom0 crashed: rebooting machine in 5 seconds.Something in Linux at ffffffff8101fdb9 followed a NULL pointer. Can yousee what it was with the linux debug symbols? ~Andrew
Sure thing:
addr2line -e vmlinux-4.8.0-rc8-20161002-linus-xennext+ ffffffff8101fdb9
/usr/src/new/linux-linus/arch/x86/xen/irq.c:34
asmlinkage __visible unsigned long xen_save_fl(void)
{
struct vcpu_info *vcpu;
unsigned long flags;
vcpu = this_cpu_read(xen_vcpu);
/* flag has opposite sense of mask */
flags = !vcpu->evtchn_upcall_mask; <== WHICH IS HERE
/* convert to IF type flag
-0 -> 0x00000000
-1 -> 0xffffffff
*/
return (-flags) & X86_EFLAGS_IF;
}
--
Sander
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