[Xen-users] Kernel panic when using Xen-3.3.0 fs-backend and Mini-OS in Ubuntu 8.04

[Wei LIU <liuw@xxxxxxxxx>]

Hi, all

I'm testing Mini-OS's fs-front driver and Xen-3.3.0's fs-backend.
Kernel version is 2.6.24-26-xen, a shipped version of Ubuntu 8.04.

I uncommented line 1173 in extras/mini-os/fs-front.c, so Mini-OS
should create "fs-tester" thread to do some read/write stuff.
Unfortunately, I got kernel panic. If I don't create that testing
thread, I won't get a kernel panic.

It seems that fs-backend crashes, and the causes kernel panic.

How can I fix this problem? Is that a kernel bug?

Any reply is welcomed.

Wei LIU
2010-04-15


(XEN) mm.c:2850:d0 Grant map attempted to update a non-L1 page
(XEN) mm.c:2850:d0 Grant map attempted to update a non-L1 page
(XEN) mm.c:2850:d0 Grant map attempted to update a non-L1 page
[29465.879731] general protection fault: 0000 [#1] SMP
[29465.882297] Modules linked in: bridge ipv6 iptable_filter ip_tables
x_tables lp loop af_packet 8250_pnp parport_pc 8250 serial_core
parport evdev serio_raw psmouse container ac button i2c_piix4 i2c_core
intel_agp shpchp pci_hotplug agpgart ext3 jbd mbcache sr_mod cdrom
pata_acpi sg sd_mod ata_generic floppy ehci_hcd uhci_hcd pcnet32 mii
usbcore mptspi mptscsih mptbase scsi_transport_spi ata_piix libata
scsi_mod thermal processor fan fuse
[29465.973564]
[29465.995103] Pid: 9324, comm: fs-backend Not tainted (2.6.24-26-xen #1)
[29465.997319] EIP: 0061:[<c016c1b0>] EFLAGS: 00010296 CPU: 0
[29465.999305] EIP is at do_wp_page+0x100/0x9f0
[29466.000889] EAX: f57f7000 EBX: f57f7000 ECX: 00000400 EDX: 80000000
[29466.003001] ESI: fb531000 EDI: f57f7000 EBP: fb531000 ESP: ec4fbd38
[29466.025550]  DS: 007b ES: 007b FS: 00d8 GS: 0033 SS: 0069
[29466.027421] Process fs-backend (pid: 9324, ti=ec4fa000
task=ea4962f0 task.ti=ec4fa000)
[29466.029946] Stack: 12dbe065 00000000 cbb0569d 00000006 b7f52000
ec5ab9bc ec6f2ac0 00000000
[29466.056041]        00000000 c1c2ffe0 ed40c0c0 c018f8a5 12dbe065
00000000 f57f4000 c1d46620
[29466.061855]        c0464fa0 04a7d061 80000000 ed2ac234 00000001
04a7d067 c1d30fac f57f4a90
[29466.087922] Call Trace:
[29466.089533]  [<c018f8a5>] link_path_walk+0x65/0xc0
[29466.091689]  [<c01717ba>] handle_mm_fault+0xc5a/0x1360
[29466.093875]  [<c019bc73>] mntput_no_expire+0x13/0x70
[29466.116265]  [<c019bc73>] mntput_no_expire+0x13/0x70
[29466.118381]  [<c0276e46>] tty_ldisc_deref+0x46/0x70
[29466.120514]  [<c032a27e>] do_page_fault+0x35e/0xe70
[29466.122610]  [<c01f6047>] apparmor_inode_permission+0x47/0x70
[29466.145325]  [<c0197138>] __d_path+0x138/0x210
[29466.147250]  [<c019bc73>] mntput_no_expire+0x13/0x70
[29466.149265]  [<c01988a6>] d_path+0xd6/0xf0
[29466.151148]  [<c0329f20>] do_page_fault+0x0/0xe70
[29466.153184]  [<c0328bc5>] error_code+0x35/0x40
[29466.175954]  [<c019007b>] do_unlinkat+0xcb/0x140
[29466.177935]  [<c021093a>] __copy_to_user_ll+0x3a/0x70
[29466.180021]  [<c01a0827>] seq_read+0x1a7/0x290
[29466.181980]  [<c01a0680>] seq_read+0x0/0x290
[29466.183846]  [<c0185f17>] vfs_read+0xb7/0x170
[29466.206450]  [<c0186471>] sys_read+0x41/0x70
[29466.208426]  [<c0105832>] syscall_call+0x7/0xb
[29466.210455]  =======================
[29466.211844] Code: 00 00 8b 44 24 3c ba 03 00 00 00 e8 eb d3 fa ff
ba 04 00 00 00 89 c5 8b 44 24 24 89 ee e8 d9 d3 fa ff b9 00 04 00 00
89 c3 89 c7 <f3> a5 ba 03 00 00 00 89 e8 e8 02 d1 fa ff ba 04 00 00 00
89 d8
[29466.301195] EIP: [<c016c1b0>] do_wp_page+0x100/0x9f0 SS:ESP 0069:ec4fbd38
[29466.304157] ---[ end trace bcad1592f35abc4d ]---
[29466.326567] note: fs-backend[9324] exited with preempt_count 2
[29466.328563] BUG: scheduling while atomic: fs-backend/9324/0x10000002
[29466.330651] Pid: 9324, comm: fs-backend Tainted: G      D 2.6.24-26-xen #1
[29466.332915]  [<c0326dd8>] schedule+0x318/0x640
[29466.355570]  [<c0126573>] __call_console_drivers+0x53/0x60
[29466.357850]  [<c0126ee1>] vprintk+0x1f1/0x3d0
[29466.359762]  [<c01222a3>] __cond_resched+0x13/0x40
[29466.361818]  [<c0327177>] cond_resched+0x27/0x30
[29466.363804]  [<c018190c>] kmem_cache_alloc+0xdc/0x100
[29466.386528]  [<c015c0d4>] taskstats_exit+0x1c4/0x330
[29466.388636]  [<c0129dfe>] do_exit+0x15e/0x890
[29466.390601]  [<c01270db>] printk+0x1b/0x20
[29466.392483]  [<c01063d7>] die+0x287/0x290
[29466.394317]  [<c0328e20>] do_general_protection+0x0/0x190
[29466.417486]  [<c0328bc5>] error_code+0x35/0x40
[29466.419481]  [<c016c1b0>] do_wp_page+0x100/0x9f0
[29466.421479]  [<c018f8a5>] link_path_walk+0x65/0xc0
[29466.423566]  [<c01717ba>] handle_mm_fault+0xc5a/0x1360
[29466.446134]  [<c019bc73>] mntput_no_expire+0x13/0x70
[29466.448132]  [<c019bc73>] mntput_no_expire+0x13/0x70
[29466.450227]  [<c0276e46>] tty_ldisc_deref+0x46/0x70
[29466.452410]  [<c032a27e>] do_page_fault+0x35e/0xe70
[29466.454573]  [<c01f6047>] apparmor_inode_permission+0x47/0x70
[29466.477547]  [<c0197138>] __d_path+0x138/0x210
[29466.479538]  [<c019bc73>] mntput_no_expire+0x13/0x70
[29466.481660]  [<c01988a6>] d_path+0xd6/0xf0
[29466.483552]  [<c0329f20>] do_page_fault+0x0/0xe70
[29466.506394]  [<c0328bc5>] error_code+0x35/0x40
[29466.508426]  [<c019007b>] do_unlinkat+0xcb/0x140
[29466.510464]  [<c021093a>] __copy_to_user_ll+0x3a/0x70
[29466.512572]  [<c01a0827>] seq_read+0x1a7/0x290
[29466.514493]  [<c01a0680>] seq_read+0x0/0x290
[29466.536834]  [<c0185f17>] vfs_read+0xb7/0x170
[29466.538787]  [<c0186471>] sys_read+0x41/0x70
[29466.540750]  [<c0105832>] syscall_call+0x7/0xb
[29466.542605]  =======================
[29466.568445] ------------[ cut here ]------------
[29466.570263] kernel BUG at
/build/buildd/linux-2.6.24/debian/build/custom-source-xen/arch/x86/mm/highmem_32-xen.c:42!
[29466.573525] invalid opcode: 0000 [#2] SMP
[29466.596241] Modules linked in: bridge ipv6 iptable_filter ip_tables
x_tables lp loop af_packet 8250_pnp parport_pc 8250 serial_core
parport evdev serio_raw psmouse container ac button i2c_piix4 i2c_core
intel_agp shpchp pci_hotplug agpgart ext3 jbd mbcache sr_mod cdrom
pata_acpi sg sd_mod ata_generic floppy ehci_hcd uhci_hcd pcnet32 mii
usbcore mptspi mptscsih mptbase scsi_transport_spi ata_piix libata
scsi_mod thermal processor fan fuse

...[snip]...

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