Description of problem: Kernel panic happens frequently when using WWAN (cdc_acm) on the train. The same problem never happened at the office or at home. The hardware is: Bus 002 Device 004: ID 0bdb:1900 Ericsson Business Mobile Networks BV also known as: Ericsson F3507g Mobile Broadband Module. http://www.thinkwiki.org/wiki/Ericsson_F3507g_Mobile_Broadband_Module Version-Release number of selected component (if applicable): kernel-2.6.18-194.3.1.el5.x86_64 kernel-2.6.18-201.el5.x86_64 How reproducible: Very often (multiple times on a 1 hour commute) Kernel messages and panic is attached to this report. Here is the call trace: Call Trace: <IRQ> [<ffffffff881cb3b8>] :cdc_acm:acm_read_bulk+0x5c/0xd7 [<ffffffff801f73a3>] usb_hcd_giveback_urb+0x37/0x65 [<ffffffff88000dc8>] :ehci_hcd:ehci_urb_done+0x8e/0x9e [<ffffffff880010c5>] :ehci_hcd:qh_completions+0x9a/0x344 [<ffffffff8800181d>] :ehci_hcd:ehci_work+0xad/0x6d1 [<ffffffff8800463c>] :ehci_hcd:ehci_irq+0x145/0x15d [<ffffffff801f7d92>] usb_hcd_irq+0x27/0x55 [<ffffffff80010ba6>] handle_IRQ_event+0x51/0xa6 [<ffffffff800bb01a>] __do_IRQ+0xa4/0x103 [<ffffffff8006ca11>] do_IRQ+0xe7/0xf5 [<ffffffff8005d615>] ret_from_intr+0x0/0xa [<ffffffff80064a88>] _spin_lock+0x3/0xa [<ffffffff881cab0f>] :cdc_acm:acm_rx_tasklet+0xfe/0x21b [<ffffffff80094fb8>] tasklet_action+0x89/0xfd [<ffffffff800123af>] __do_softirq+0x89/0x133 [<ffffffff8005e2fc>] call_softirq+0x1c/0x28 [<ffffffff8006cb8e>] do_softirq+0x2c/0x85 [<ffffffff8006ca16>] do_IRQ+0xec/0xf5 [<ffffffff8005d615>] ret_from_intr+0x0/0xa <EOI> [<ffffffff8019dd6d>] acpi_processor_idle_simple+0x10d/0x30e [<ffffffff8019dddd>] acpi_processor_idle_simple+0x17d/0x30e [<ffffffff8019dccc>] acpi_processor_idle_simple+0x6c/0x30e [<ffffffff8019dc60>] acpi_processor_idle_simple+0x0/0x30e [<ffffffff80049323>] cpu_idle+0x95/0xb8 [<ffffffff80407807>] start_kernel+0x220/0x225 [<ffffffff8040722f>] _sinittext+0x22f/0x236
Could this one be related ? https://bugzilla.redhat.com/show_bug.cgi?id=237323
Created attachment 428532 [details] hard irq locking You can certainly try that patch. Not sure why it never made it into RHEL-5.
Let me know if you need me to build a binary for you. Cheers, Don
Any feedback? Cheers, Don
closing due to no feedback. Feel free to re-open if this is still a problem. Cheers, Don