linux-ext4 - [Bug 25832] kernel crashes upon resume if usb devices are removed when suspended

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Message-Id: <201102200016.p1K0GZxP031017@demeter1.kernel.org>
Date:	Sun, 20 Feb 2011 00:16:35 GMT
From:	bugzilla-daemon@...zilla.kernel.org
To:	linux-ext4@...r.kernel.org
Subject: [Bug 25832] kernel crashes upon resume if usb devices are removed
 when suspended

https://bugzilla.kernel.org/show_bug.cgi?id=25832





--- Comment #31 from rocko <rockorequin@...mail.com>  2011-02-20 00:16:33 ---
Thanks, that helped a lot! Incidentally, if I don't sleep between unbind and
bind operations in the script, the kernel becomes unresponsive (ie to
everything including ssh sessions, ctrl-c/d/z and trying to switch to another
tty) and just keeps scrolling the bind/unbind messages up the screen, even long
after I remove the USB device, so presumably bind/unbind would have to fail at
this point.

Anyway, I managed to reproduce the freeze quite quickly with just a single USB
key. The stack trace is slightly longer this time:

<this scrolled off the top of the screen>
wake_up_process
wakeup_timer_fn
run_timer_softirq
? wakeup_timer_fn
__do_softirq
call_softirq
irq_exit
do_IRQ
ret_from_intr
? arch_local_irq_enable
? sched_clock_idle_wakeup_event
acpi_idle_enter_bm
cpuidle_idle_call
cpu_idle
rest_init
start_kernel
x86_64_start_reservvations
x86_64_start_kernel
...
RIP task_rq_lock
--- end trace ---
Kernel panic - not syncing: fatal exception in interrupt
Pid: 0, comm: swapper
Call trace:
IRQ ? panic
? kmsg_dump
? oops_end
? no_context
? __bad_area_nosemaphore
? bad_area_nosemaphore
? enqueue_task
? resched_task
? try_to_wake_up
? native_sched_clock
? native_sched_clock [yes, twice]
? page_fault
? task_rq_lock
? try_to_wake_up
? wake_up_process
? wake_up_process [twice]
? wakeup_timer
? run_timer_softirq
? wakeup_timer_fn
? __do_softirq
? call_softirq
? irq_exit
? do_IRQ
? ret_from_intr
? arch_local_irq_enable
? sched_clock_idle_wakeup_event
? acpi_idle_enter_bm
? cpuidle_idle_call
? cpu_idle
? rest_init
? x86_64_start_reservvations
? x86_64_start_kernel

But does that help any?

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