Public bug reported:
The following soft lockup is seen randomly on m2.2xlarge instances in
EC2:
[1284451.875485] BUG: soft lockup - CPU#3 stuck for 61s! [identify:24060]
[1284451.875485] Modules linked in: ipv6 ipt_REJECT ipt_LOG xt_limit
nf_conntrack_ipv4 nf_defrag_ipv4 xt_state nf_conntrack xt_tcpudp xt_owner
iptable_filter ip_tables x_tables raid10 raid456 async_pq async_xor xor
async_memcpy async_raid6_recov raid6_pq async_tx raid1 raid0 multipath linear
md_mod
[1284451.875485] CPU 3:
[1284451.875485] Modules linked in: ipv6 ipt_REJECT ipt_LOG xt_limit
nf_conntrack_ipv4 nf_defrag_ipv4 xt_state nf_conntrack xt_tcpudp xt_owner
iptable_filter ip_tables x_tables raid10 raid456 async_pq async_xor xor
async_memcpy async_raid6_recov raid6_pq async_tx raid1 raid0 multipath linear
md_mod
[1284451.875485] Pid: 24060, comm: identify Tainted: G D 2.6.32-316-ec2
#31-Ubuntu
[1284451.875485] RIP: e030:[<ffffffff810063aa>] [<ffffffff810063aa>]
0xffffffff810063aa
[1284451.875485] RSP: e02b:ffff8800eba4d930 EFLAGS: 00000246
[1284451.875485] RAX: 0000000000000000 RBX: ffff88025b7634c8 RCX:
ffffffff810063aa
[1284451.875485] RDX: 0000000000000019 RSI: ffff8800eba4d948 RDI:
0000000000000003
[1284451.875485] RBP: ffff8800eba4d968 R08: ffff88025b763708 R09:
0000000000000040
[1284451.875485] R10: 0000000000007ff0 R11: 0000000000000246 R12:
0000000000000015
[1284451.875485] R13: 0000000000000045 R14: ffff88025b7634a8 R15:
0000000000000001
[1284451.875485] FS: 00007f1a7f487700(0000) GS:ffff880002f35000(0000)
knlGS:0000000000000000
[1284451.875485] CS: e033 DS: 0000 ES: 0000 CR0: 0000000080050033
[1284451.875485] CR2: 00007f16bfb0a398 CR3: 0000000001001000 CR4:
0000000000002660
[1284451.875485] DR0: 0000000000000000 DR1: 0000000000000000 DR2:
0000000000000000
[1284451.875485] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7:
0000000000000400
[1284451.875485] Call Trace:
[1284451.875485] [<ffffffff813a1e5f>] ? xen_poll_irq+0x7f/0xc0
[1284451.875485] [<ffffffff813a70d4>] xen_spin_wait+0x84/0x170
[1284451.875485] [<ffffffff814b112e>] ? _spin_lock+0x3e/0x60
[1284451.875485] [<ffffffff814b1143>] _spin_lock+0x53/0x60
[1284451.875485] [<ffffffff8101bf28>] _pin_lock+0x28/0x290
[1284451.875485] [<ffffffff8101d0ff>] mm_unpin+0x1f/0x40
[1284451.875485] [<ffffffff8101d1b1>] arch_exit_mmap+0x91/0xa0
[1284451.875485] [<ffffffff810d24f8>] exit_mmap+0x38/0x1b0
[1284451.875485] [<ffffffff8103a8ad>] mmput+0x2d/0x100
[1284451.875485] [<ffffffff8103f94d>] exit_mm+0x10d/0x150
[1284451.875485] [<ffffffff81040192>] do_exit+0x132/0x370
[1284451.875485] [<ffffffff814b2067>] oops_end+0xa7/0xf0
[1284451.875485] [<ffffffff8100dbf6>] die+0x56/0x90
[1284451.875485] [<ffffffff814b1794>] do_trap+0xc4/0x170
[1284451.875485] [<ffffffff8100b3c0>] do_invalid_op+0xb0/0xd0
[1284451.875485] [<ffffffff8101f5e4>] ? do_lN_entry_update+0x174/0x180
[1284451.875485] [<ffffffff810b2e35>] ? zone_watermark_ok+0x25/0xe0
[1284451.875485] [<ffffffff810b38de>] ? prep_new_page+0x11e/0x1c0
[1284451.875485] [<ffffffff8100a4b5>] invalid_op+0x25/0x30
[1284451.875485] [<ffffffff8101f5e4>] ? do_lN_entry_update+0x174/0x180
[1284451.875485] [<ffffffff8101f58e>] ? do_lN_entry_update+0x11e/0x180
[1284451.875485] [<ffffffff810b4636>] ? __alloc_pages_nodemask+0xd6/0x180
[1284451.875485] [<ffffffff8101fafb>] xen_l2_entry_update+0x13b/0x160
[1284451.875485] [<ffffffff810c99c6>] __pte_alloc+0x166/0x170
[1284451.875485] [<ffffffff810cdf65>] handle_mm_fault+0x495/0x4f0
[1284451.875485] [<ffffffff814b3767>] do_page_fault+0x147/0x390
[1284451.875485] [<ffffffff814b1598>] page_fault+0x28/0x30
The pinning hypercall in do_lN_entry_update() failed, triggering a BUG()
which invokes do_invalid_op(). Unfortunately we don't get the BUG()
message. Instead, we end up deadlocked on the pin lock.
ProblemType: Bug
DistroRelease: Ubuntu 10.04
Package: linux-ec2 2.6.32.341.22
ProcVersionSignature: User Name 2.6.32-341.42-ec2 2.6.32.49+drm33.21
Uname: Linux 2.6.32-341-ec2 x86_64
Architecture: amd64
Date: Fri Jan 20 22:43:24 2012
Ec2AMI: ami-55dc0b3c
Ec2AMIManifest: (unknown)
Ec2AvailabilityZone: us-east-1c
Ec2InstanceType: m2.2xlarge
Ec2Kernel: aki-427d952b
Ec2Ramdisk: unavailable
ProcEnviron:
LANG=en_US.UTF-8
SHELL=/bin/bash
SourcePackage: linux-meta-ec2
** Affects: linux-meta-ec2 (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug ec2-images lucid
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https://bugs.launchpad.net/bugs/919431
Title:
CPU soft lockup in Xen PTE allocation on m2.2xlarge instances
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