[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] Crash when reading /proc/kcore, kernel 2.6.32 xen/stable-2.6.32.x
I'm using kernel 2.6.32 xen/stable-2.6.32.x from Jeremy's git tree. While testing zfs, I noticed that this kernel would crash every time /proc/kcore is read. Something like this is enough to reproduce it: # dd if=/proc/kcore of=/dev/null bs=1M count=1 BUG: unable to handle kernel paging request at ffff9d5555555000 IP: [<ffffffff81037ee0>] kern_addr_valid+0x44/0xcc PGD 0 Oops: 0000 [#1] SMP last sysfs file: /sys/devices/system/cpu/cpu1/cache/index2/shared_cpu_map CPU 1 Modules linked in: xen_netback blktap xen_blkback blkback_pagemap ip6table_filter ip6_tables ebtable_nat ebtables ipt_MASQUERADE iptable_nat nf_nat nf_conntrack_ipv4 nf_defrag_ipv4 xt_state nf_conntrack ipt_REJECT xt_tcpudp iptable_filter ip_tables x_tables autofs4 hidp rfcomm l2cap bluetooth rfkill lzfs zfs(P) zcommon(P) znvpair(P) zavl(P) zlib_deflate zunicode(P) spl lockd sunrpc 8021q garp bridge stp llc ib_iser rdma_cm ib_cm iw_cm ib_sa ib_mad ib_core ib_addr iscsi_tcp bnx2i cnic uio ipv6 cxgb3i cxgb3 mdio libiscsi_tcp libiscsi scsi_transport_iscsi video output sbs sbshc parport_pc lp parport ipmi_devintf bnx2 radeon snd_seq_dummy ttm drm_kms_helper drm i2c_algo_bit i2c_core ipmi_si ipmi_msghandler hpwdt snd_seq_oss snd_seq_midi_event serio_raw snd_seq snd_seq_device snd_pcm_oss snd_mixer_oss snd_pcm i5k_amb iTCO_wdt snd_timer i5000_edac iTCO_vendor_support edac_core snd shpchp soundcore snd_page_alloc pcspkr qla2xxx scsi_transport_fc scsi_tgt cciss uhci_hcd ohci_hcd ehci_hcd [last unloaded: freq_table] Pid: 8944, comm: dd Tainted: P 2.6.32.27-1.pv_ops.el5.fanxen #1 ProLiant BL460c G1 RIP: e030:[<ffffffff81037ee0>] [<ffffffff81037ee0>] kern_addr_valid+0x44/0xcc RSP: e02b:ffff880038a1dc20 EFLAGS: 00010286 RAX: ffff9d5555555000 RBX: ffff800000000000 RCX: ffffffff81918440 RDX: ffff880000000000 RSI: 0000000000000000 RDI: 00000002afffd067 RBP: ffff880038a1dc28 R08: ffff880038a1ddd8 R09: ffff880038a1de08 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000001000 R13: ffff800000000000 R14: 0000000000002000 R15: 00000000000fe000 FS: 00007f31849dd6e0(0000) GS:ffff880028055000(0000) knlGS:0000000000000000 CS: e033 DS: 0000 ES: 0000 CR0: 000000008005003b CR2: ffff9d5555555000 CR3: 0000000038ab3000 CR4: 0000000000002660 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 Process dd (pid: 8944, threadinfo ffff880038a1c000, task ffff880036b981c0) Stack: ffff8800327d44a8 ffff880038a1dec8 ffffffff81170afb ffff880038a1df48 <0> 00007f31848dd000 0000000000002000 0000000000002000 0000000000000000 <0> 0000000000000000 0000000000000000 0000000000000000 0000000000000000 Call Trace: [<ffffffff81170afb>] read_kcore+0x4bb/0x574 [<ffffffff8100ee27>] ? xen_set_pte_at+0xd1/0xef [<ffffffff81167cdf>] proc_reg_read+0x76/0x90 [<ffffffff81118e69>] vfs_read+0xad/0x107 [<ffffffff8111991d>] sys_read+0x4c/0x70 [<ffffffff81012db2>] system_call_fastpath+0x16/0x1b Code: f8 fd 0f 86 a6 00 00 00 48 c1 ef 24 81 e7 f8 0f 00 00 48 03 3d 9a be 64 00 48 83 3f 00 0f 84 8b 00 00 00 48 89 de e8 24 fa ff ff <48> 83 38 00 48 89 c7 74 7a 48 89 de e8 d7 f9 ff ff 48 8b 38 48 RIP [<ffffffff81037ee0>] kern_addr_valid+0x44/0xcc RSP <ffff880038a1dc20> CR2: ffff9d5555555000 ---[ end trace 037fec8dd189bf20 ]--- Kernel panic - not syncing: Fatal exception Pid: 8944, comm: dd Tainted: P D 2.6.32.27-1.pv_ops.el5.fanxen #1 Call Trace: [<ffffffff810300ef>] ? gdb_regs_to_pt_regs+0x83/0xb6 [<ffffffff81058b6a>] panic+0xa5/0x164 [<ffffffff81430035>] ? agp_amd64_probe+0x570/0x584 [<ffffffff8100f2b1>] ? xen_force_evtchn_callback+0xd/0xf [<ffffffff8100fa32>] ? check_events+0x12/0x20 [<ffffffff810300ef>] ? gdb_regs_to_pt_regs+0x83/0xb6 [<ffffffff81058837>] ? print_oops_end_marker+0x23/0x25 [<ffffffff810300ef>] ? gdb_regs_to_pt_regs+0x83/0xb6 [<ffffffff8143eb66>] oops_end+0xb7/0xc7 [<ffffffff810387ac>] no_context+0x205/0x214 [<ffffffff810300ef>] ? gdb_regs_to_pt_regs+0x83/0xb6 [<ffffffff810f1372>] ? handle_mm_fault+0x312/0x776 [<ffffffff810389ff>] __bad_area_nosemaphore+0x183/0x1a6 [<ffffffff81038aac>] bad_area_nosemaphore+0x13/0x15 [<ffffffff8143ffdd>] do_page_fault+0x147/0x26c [<ffffffff8143e075>] page_fault+0x25/0x30 [<ffffffff81037ee0>] ? kern_addr_valid+0x44/0xcc [<ffffffff81170afb>] read_kcore+0x4bb/0x574 [<ffffffff8100ee27>] ? xen_set_pte_at+0xd1/0xef [<ffffffff81167cdf>] proc_reg_read+0x76/0x90 [<ffffffff81118e69>] vfs_read+0xad/0x107 [<ffffffff8111991d>] sys_read+0x4c/0x70 [<ffffffff81012db2>] system_call_fastpath+0x16/0x1b (XEN) Debugging connection not set up. (XEN) Domain 0 crashed: rebooting machine in 5 seconds. Is this a known issue? -- Fajar _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel
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