On 25 April 2013 05:58, John David Anglin <dave.anglin@xxxxxxxx> wrote: > On 4/24/2013 4:08 PM, Rolf Eike Beer wrote: >> >> video=radeonfb:off > > > I think this is a thread stack overrun. See this patch: > http://www.spinics.net/lists/linux-parisc/msg04680.html > but increase THREAD_SIZE_ORDER to 4. > > There are various manifestations of this but they all involve crashes during > interrupt handling. I get the same bug with radeonfb on my c8000. Bumping THREAD_SIZE_ORDER did not help. Passing the video=radeonfb:off kernel parameter is an effective workaround. When building as a module and later loading radeonfb.ko, the hang remains but the machine responds to ping. I snapped the output below, which hopefully helps someone. I'm using a stock kernel 3.8.8. -Graham burke:~# modprobe radeonfb [ 403.888000] radeonfb 0000:80:00.0: enabling SERR and PARITY (0107 -> 0147) [ 463.712000] INFO: rcu_sched detected stalls on CPUs/tasks: { 3} (detected by 1, t=15021 jiffies, g=3107, c=3106, q=27) [ 463.856000] Task dump for CPU 3: [ 463.896000] modprobe R running task 0 2822 2815 0x00000016 [ 463.992000] Backtrace: [ 464.024000] [<00000000403ca6a8>] __driver_attach+0x100/0x108 [ 464.100000] [<00000000403c7940>] bus_for_each_dev+0x98/0xf8 [ 464.172000] [<00000000403c9c70>] driver_attach+0x28/0x38 [ 464.244000] [<00000000403c9534>] bus_add_driver+0xfc/0x360 [ 464.320000] [<00000000403cad58>] driver_register+0x90/0x1e8 [ 464.396000] [<000000004036a628>] __pci_register_driver+0x48/0x58 [ 464.476000] [<000000001029f04c>] radeonfb_init+0x2c/0x38 [radeonfb] [ 464.560000] [<0000000040117524>] do_one_initcall+0x18c/0x1e8 [ 464.636000] [<0000000040193998>] load_module+0x1cf0/0x2298 [ 464.708000] [<0000000040194018>] sys_init_module+0xd8/0x110 [ 464.784000] [<0000000040105f48>] syscall_exit+0x0/0x14 [ 464.852000] [ 464.872000] timer_interrupt(CPU 1): delayed! cycles 4BEAD5A6 rem 23615A next/now 8B58E727CD/8B58C3C673 [ 476.324000] BUG: soft lockup - CPU#0 stuck for 22s! [sshd:2766] [ 476.324000] Modules linked in: radeonfb(+) i2c_algo_bit fb_ddc snd_cmipci snd_mpu401_uart snd_opl3_lib snd_hwdep snd_rawmidi snd_seq_device snd_pcm snd_page_alloc snd_timer snd soundcore [ 476.324000] [ 476.324000] YZrvWESTHLNXBCVMcbcbcbcbOGFRQPDI [ 476.324000] PSW: 00001000000001101111111100001111 Not tainted [ 476.324000] r00-03 000000ff0806ff0f 0000000040820370 000000004018e7d0 000000004073def0 [ 476.324000] r04-07 000000004080f370 0000000043626500 00000000406ac1c0 0000000000000001 [ 476.324000] r08-11 0000000000000003 0000000040706c70 fffffffffffffffe 00000000407b1890 [ 476.324000] r12-15 0000000000000000 00000000406c8540 0000000000000000 000000004075e624 [ 476.324000] r16-19 000000007ecea428 0000000000080140 0000000000068848 fffffffffe799000 [ 476.324000] r20-23 ffffffffffffffff 0000000043626530 000000000800000f 0000000000000001 [ 476.324000] r24-27 0000000000000004 0000000000000004 0000000043626538 000000004080f370 [ 476.324000] r28-31 0000000000000001 000000007e140740 000000007e1406a0 0000000000000004 [ 476.324000] sr00-03 000000000062d800 0000000000000000 0000000000000000 000000000062d800 [ 476.324000] sr04-07 0000000000000000 0000000000000000 0000000000000000 0000000000000000 [ 476.324000] [ 476.324000] IASQ: 0000000000000000 0000000000000000 IAOQ: 000000004018e69c 000000004018e6a0 [ 476.324000] IIR: 44bc0040 ISR: 00000000406b7940 IOR: 000000004080f370 [ 476.324000] CPU: 0 CR30: 000000007e140000 CR31: fffffff0f0e034e0 [ 476.324000] ORIG_R28: 0000000000000002 [ 476.324000] IAOQ[0]: smp_call_function_many+0x344/0x3d8 [ 476.324000] IAOQ[1]: smp_call_function_many+0x348/0x3d8 [ 476.324000] RP(r2): on_each_cpu+0x50/0x90 [ 476.324000] Backtrace: [ 476.324000] [<000000004018e7d0>] on_each_cpu+0x50/0x90 [ 476.324000] [<0000000040119aec>] flush_cache_mm+0x24/0x30 [ 476.324000] [<000000004013d158>] dup_mm+0x118/0x5e8 [ 476.324000] [<000000004013e0ec>] copy_process.part.63+0xa24/0x1488 [ 476.324000] [ 476.324000] Kernel panic - not syncing: softlockup: hung tasks [ 476.324000] Backtrace: [ 476.324000] [<000000004011a0f0>] dump_stack+0x18/0x28 [ 476.324000] [<000000004013fbd8>] panic+0x128/0x398 [ 476.324000] [<000000004019af98>] watchdog_timer_fn+0x2b0/0x2c8 [ 476.324000] [<000000004016c714>] hrtimer_run_queues+0x134/0x320 [ 476.324000] [<0000000040151af4>] update_process_times+0x4c/0xc0 [ 476.324000] [<000000004011b7bc>] timer_interrupt+0x19c/0x200 [ 476.324000] [<000000004019bfa4>] handle_irq_event_percpu+0xac/0x300 [ 476.324000] [<00000000401a08f0>] handle_percpu_irq+0xa8/0xe0 [ 476.324000] [<000000004019b3f0>] generic_handle_irq+0x40/0x50 [ 476.324000] [<000000004011c320>] do_cpu_irq_mask+0x1d0/0x2b8 [ 476.324000] [<0000000040105074>] intr_return+0x0/0x4 [ 476.324000] -- To unsubscribe from this list: send the line "unsubscribe linux-parisc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
