Preview Tool

Cisco Bug: CSCup46095 - Deadlock in low level packet filter cause to CPU starvation

Last Modified

Apr 06, 2015

Products (1)

  • Cisco Videoscape Distribution Suite Transparent Caching

Known Affected Releases


Description (partial)

Deadlock in low level packet filter cause to CPU starvation and finally cause hardware watchdog to expired and reboot the CE with the following kernel call trace:
31486 kernel: Call Trace:
31487 kernel:  [<ffffffff8020d9f9>] show_trace_log_lvl+0x41/0x58
31488 kernel:  [<ffffffff80496ad4>] dump_stack+0x69/0x6f
31489 kernel:  [<ffffffff8023bf49>] warn_slowpath+0xa9/0xd1
31490 kernel:  [<ffffffff80435ce3>] dev_watchdog+0x11c/0x1ad
31491 kernel:  [<ffffffff802448f1>] run_timer_softirq+0x18d/0x204
31492 kernel:  [<ffffffff80240ec4>] __do_softirq+0x7d/0x107
31493 kernel:  [<ffffffff8020d2ac>] call_softirq+0x1c/0x28
31494 kernel:  [<ffffffff8020e553>] do_softirq+0x2c/0x68
31495 kernel:  [<ffffffff80240bf1>] irq_exit+0x3f/0x85
31496 kernel:  [<ffffffff8021b09c>] smp_apic_timer_interrupt+0x95/0xae
31497 kernel:  [<ffffffff8020cc86>] apic_timer_interrupt+0x66/0x70
31498 kernel:  [<ffffffff80212722>] mwait_idle+0x3c/0x3f
31499 kernel:  [<ffffffff8020b04a>] cpu_idle+0x88/0xd0
31500 kernel:  [<ffffffff8095bdfd>] start_kernel+0x3b1/0x3bd
31501 kernel:  [<ffffffff8095b38f>] x86_64_start_kernel+0xde/0xe4
31502 kernel:
31503 kernel: ---[ end trace 2de3dfda2de55908 ]---

Under rare scenario that the Lower Layer Packet Forwarder is handed IOCTL to it may get into hang status.
Bug details contain sensitive information and therefore require a account to be viewed.

Bug Details Include

  • Full Description (including symptoms, conditions and workarounds)
  • Status
  • Severity
  • Known Fixed Releases
  • Related Community Discussions
  • Number of Related Support Cases
Bug information is viewable for customers and partners who have a service contract. Registered users can view up to 200 bugs per month without a service contract.