[ kvm-Bugs-1984384 ] soft lockup - CPU#5 stuck for 11s! [qemu-system-x86:4966]

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Bugs item #1984384, was opened at 2008-06-04 13:49
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Category: None
Group: None
Status: Open
Resolution: None
Priority: 5
Private: No
Submitted By: Rafal Wijata (ravpl)
Assigned to: Nobody/Anonymous (nobody)
Summary: soft lockup - CPU#5 stuck for 11s! [qemu-system-x86:4966]

Initial Comment:
I'm using kvm-69 running on
Linux 2.6.24.7-92.fc8 #1 SMP Wed May 7 16:26:02 EDT 2008 x86_64 x86_64 x86_64 GNU/Linux
kvm modules loaded from kvm-69 rather than kernel provided

My system almost freezed after I killed qemu process.
I saw many, many tasks in 'D' state, along with [reiserfs/?] tasks.
Normally I would consider it reiserfs bug(and maybe it is), but two things
- it happened after qemu process was killed(running with 6cpus, 6G memory, 16G hdd placed on reiserfs placed on 200M/s hdd)

- dmesg showed following messages(2 total), which suggest it stucked in kvm

BUG: soft lockup - CPU#5 stuck for 11s! [qemu-system-x86:4966]
CPU 5:
Modules linked in: ipt_REJECT nf_conntrack_ipv4 iptable_filter ip_tables kvm_intel(U) kvm(U) tun nfs lockd nfs_acl autofs4 coretemp hwmon fuse sunrpc bridge xt_tcpudp nf_conntrack_ipv6 xt_state nf_conntrack ip6t_REJECT ip6table_filter ip6_tables x_tables ipv6 cpufreq_ondemand acpi_cpufreq reiserfs ext2 dm_mirror dm_multipath dm_mod i5000_edac iTCO_wdt serio_raw pcspkr iTCO_vendor_support e1000 button edac_core i2c_i801 ata_piix i2c_core pata_acpi ata_generic sg usb_storage ahci libata shpchp 3w_9xxx sd_mod scsi_mod ext3 jbd mbcache uhci_hcd ohci_hcd ehci_hcd
Pid: 4966, comm: qemu-system-x86 Not tainted 2.6.24.7-92.fc8 #1
RIP: 0010:[<ffffffff8834b29e>]  [<ffffffff8834b29e>] :kvm:rmap_remove+0x170/0x198
RSP: 0018:ffff8101f4df5bd8  EFLAGS: 00000246
RAX: 0000000000000002 RBX: ffff81004294af60 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000106 RDI: ffff8101770448c0
RBP: ffff8101ce0454d0 R08: ffffc20001b86030 R09: ffff8101d3587118
R10: 000000000019e7ea R11: ffff8101394dd9c0 R12: ffff8100240cece0
R13: 0000000000000000 R14: 000000000019e7ea R15: 0000000000000018
FS:  0000000000000000(0000) GS:ffff81021f049580(0000) knlGS:0000000000000000
CS:  0010 DS: 002b ES: 002b CR0: 000000008005003b
CR2: 00000000f7ff6000 CR3: 000000021b5e5000 CR4: 00000000000026e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400

Call Trace:
 [<ffffffff8834b1dd>] :kvm:rmap_remove+0xaf/0x198
 [<ffffffff8834b372>] :kvm:kvm_mmu_zap_page+0x8a/0x25e
 [<ffffffff8834b9f3>] :kvm:free_mmu_pages+0x12/0x34
 [<ffffffff8834bac9>] :kvm:kvm_mmu_destroy+0x1d/0x5e
 [<ffffffff88346979>] :kvm:kvm_arch_vcpu_uninit+0x1d/0x38
 [<ffffffff8834555b>] :kvm:kvm_vcpu_uninit+0x9/0x15
 [<ffffffff88163aa8>] :kvm_intel:vmx_free_vcpu+0x74/0x84
 [<ffffffff8834657b>] :kvm:kvm_arch_destroy_vm+0x69/0xb4
 [<ffffffff88345538>] :kvm:kvm_vcpu_release+0x13/0x18
 [<ffffffff810a35d4>] __fput+0xc2/0x18f
 [<ffffffff810a0de7>] filp_close+0x5d/0x65
 [<ffffffff8103b3df>] put_files_struct+0x66/0xc4
 [<ffffffff8103c6f7>] do_exit+0x28c/0x76b
 [<ffffffff8103cc55>] sys_exit_group+0x0/0xe
 [<ffffffff81044163>] get_signal_to_deliver+0x3aa/0x3d8
 [<ffffffff8100b359>] do_notify_resume+0xa8/0x732
 [<ffffffff8126b7f6>] unlock_kernel+0x32/0x33
 [<ffffffff881c01db>] :reiserfs:reiserfs_setattr+0x26e/0x27d
 [<ffffffff810a1866>] do_truncate+0x70/0x79
 [<ffffffff8100bf17>] sysret_signal+0x1c/0x27
 [<ffffffff8100c1a7>] ptregscall_common+0x67/0xb0


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