On 03/25/2011 11:32 AM, Tomasz Chmielewski wrote:
I got this on a 2.6.38.1 system which (I think) had some problem accessing guest image on a btrfs filesystem. general protection fault: 0000 [#1] SMP last sysfs file: /sys/kernel/uevent_seqnum CPU 0 Modules linked in: ipt_MASQUERADE vhost_net kvm_intel kvm iptable_filter xt_tcpudp iptable_nat nf_nat nf_conntrack_ipv4 nf_conntrack nf_defrag_ipv4 ip_tables x_tables bridge stp btrfs zlib_deflate crc32c libcrc32c coretemp f71882fg snd_pcm snd_timer snd soundcore i2c_i801 snd_page_alloc tpm_tis tpm tpm_bios pcspkr i7core_edac edac_core r8169 mii raid10 raid456 async_pq async_xor xor async_memcpy async_raid6_recov raid6_pq async_tx raid1 raid0 ahci libahci sata_nv sata_sil sata_via 3w_9xxx 3w_xxxx [last unloaded: scsi_wait_scan] Pid: 10199, comm: kvm Not tainted 2.6.38.1 #1 MSI MS-7522/MSI X58 Pro-E (MS-7522) RIP: 0010:[<ffffffffa02cae20>] [<ffffffffa02cae20>] kvm_unmap_rmapp+0x20/0x70 [kvm] RSP: 0018:ffff880508ee9bf0 EFLAGS: 00010202 RAX: 00008805d6b087f8 RBX: ffff8805b7b10000 RCX: 0000000000000050 RDX: 0000000000000000 RSI: 00008805d6b087f8 RDI: ffff8805b7b10000 RBP: ffff880508ee9c10 R08: ffff8801061d4000 R09: ffffc9001f19aff0 R10: 0000000000000030 R11: 0000000000000000 R12: 0000000000000000 R13: ffffc9001f19aff8 R14: 0000000000000060 R15: ffff8801061d4000 FS: 00007f7ca25d6730(0000) GS:ffff8800bf400000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b CR2: 0000000000462b10 CR3: 00000003ac47f000 CR4: 00000000000026e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 Process kvm (pid: 10199, threadinfo ffff880508ee8000, task ffff88001b5a5b00) Stack: ffffffffffffffcf 00000000000220ff 0000000000000001 ffff8801061d4050 ffff880508ee9c80 ffffffffa02c8a54 0000000000000030 ffffffffa02cae00 0000000000000000 00007f7c80a2b000 ffff8805b7b10000 0000000000000001 Call Trace: [<ffffffffa02c8a54>] kvm_handle_hva+0xb4/0x170 [kvm] [<ffffffffa02cae00>] ? kvm_unmap_rmapp+0x0/0x70 [kvm] [<ffffffffa02c8b27>] kvm_unmap_hva+0x17/0x20 [kvm] [<ffffffffa02b1e72>] kvm_mmu_notifier_invalidate_range_start+0x62/0xb0 [kvm] [<ffffffff8113ea11>] __mmu_notifier_invalidate_range_start+0x51/0x70 [<ffffffff8111e2c1>] copy_page_range+0x3b1/0x460 [<ffffffff812c5628>] ? rb_insert_color+0x98/0x140 [<ffffffff81060cdc>] dup_mm+0x2fc/0x500 [<ffffffff810617fe>] copy_process+0x8be/0x11b0 [<ffffffff81062165>] do_fork+0x75/0x350 [<ffffffff81177bcd>] ? mntput+0x1d/0x40 [<ffffffff8115b095>] ? fput+0x1e5/0x270 [<ffffffff815aa7f5>] ? _raw_spin_lock_irq+0x15/0x20 [<ffffffff81075141>] ? sigprocmask+0x91/0x110 [<ffffffff81014ab8>] sys_clone+0x28/0x30 [<ffffffff8100c3e3>] stub_clone+0x13/0x20 [<ffffffff8100c0c2>] ? system_call_fastpath+0x16/0x1b Code: 49 89 01 eb 91 66 0f 1f 44 00 00 55 48 89 e5 41 55 41 54 53 48 83 ec 08 0f 1f 44 00 00 45 31 e4 48 89 fb 49 89 f5 eb 1d 0f 1f 00<f6> 06 01 74 38 48 8b 15 a4 66 02 00 48 89 df 41 bc 01 00 00 00 RIP [<ffffffffa02cae20>] kvm_unmap_rmapp+0x20/0x70 [kvm] RSP<ffff880508ee9bf0> ---[ end trace 85201a339b7635fc ]---
0: 55 push %rbp 1: 48 89 e5 mov %rsp,%rbp 4: 41 55 push %r13 6: 41 54 push %r12 8: 53 push %rbx 9: 48 83 ec 08 sub $0x8,%rsp d: 0f 1f 44 00 00 nopl 0x0(%rax,%rax,1) 12: 45 31 e4 xor %r12d,%r12d 15: 48 89 fb mov %rdi,%rbx 18: 49 89 f5 mov %rsi,%r13 1b: eb 1d jmp 0x3a 1d: 0f 1f 00 nopl (%rax) 20: f6 06 01 testb $0x1,(%rsi) Looks like the top 16 bits of %rsi are flipped. Also wierd to see a fork(). What's your qemu command line? -- I have a truly marvellous patch that fixes the bug which this signature is too narrow to contain. -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
