Messages in this thread | | | Date | Tue, 02 Nov 2004 21:45:40 -0600 | From | "K.R. Foley" <> | Subject | Re: [patch] Real-Time Preemption, -RT-2.6.9-mm1-V0.6.8 |
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Fernando Pablo Lopez-Lezcano wrote: > On Tue, 2004-11-02 at 11:27, Ingo Molnar wrote: > >>* Ingo Molnar <mingo@elte.hu> wrote: >> >>>>This build appears to run OK and then in the middle of the real time >>>>tests stops doing useful work (during network test). >>> >>>weird, the deadlock detector did not trigger, although it is a clear >>>circular deadlock: >> >>ah ... found it - a fair portion of spinlocks and rwlocks had deadlock >>detection turned off in -V0.6.6 - amongst them ptype_lock. I've uploaded >>-V0.6.9 that fixes this. > > > This happens with V0.6.9 running on an Athlon64: > > r8169 Gigabit Ethernet driver 1.6LK loaded > ACPI: PCI interrupt 0000:00:0b.0[A] -> GSI 16 (level, low) -> IRQ 16 > divert: allocating divert_blk for eth0 > eth0: Identified chip type is 'RTL8169s/8110s'. > eth0: RTL8169 at 0xf88a0f00, 00:0c:76:b3:c2:43, IRQ 16 > BUG: atomic counter underflow at: > [<c0108153>] dump_stack+0x23/0x30 (20) > [<c02f5e91>] qdisc_destroy+0xe1/0xf0 (28) > [<c02f60ad>] dev_shutdown+0x3d/0xa0 (28) > [<c02e6ffb>] unregister_netdevice+0x12b/0x2a0 (36) > [<c0273ffe>] unregister_netdev+0x1e/0x30 (16) > [<f8b0b8b5>] rtl8169_remove_one+0x25/0x50 [r8169] (32) > [<c01f55a6>] pci_device_remove+0x76/0x80 (24) > [<c025f15d>] device_release_driver+0x6d/0x70 (24) > [<c025f18b>] driver_detach+0x2b/0x40 (20) > [<c025f5ff>] bus_remove_driver+0x3f/0x70 (20) > [<c025fb0c>] driver_unregister+0x1c/0x30 (16) > [<c01f586c>] pci_unregister_driver+0x1c/0x30 (16) > [<f8b0d357>] rtl8169_cleanup_module+0x17/0x1b [r8169] (12) > [<c013fdb1>] sys_delete_module+0x121/0x150 (96) > [<c010729d>] sysenter_past_esp+0x52/0x71 (-8124) > --------------------------- > | preempt count: 00000001 ] > | 1-level deep critical section nesting: > ---------------------------------------- > .. [<c013dc3d>] .... print_traces+0x1d/0x60 > .....[<c0108153>] .. ( <= dump_stack+0x23/0x30) > > divert: freeing divert_blk for eth0 > ip_tables: (C) 2000-2002 Netfilter core team > > -- Fernando > > > Several of us get this. I believe this bug exists in upstream kernels also, it just doesn't get caught without the detection Ingo has added.
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