On Jun 27, 2012, at 1:52 PM, Dong Liu wrote: > Hi, > > I tried to run PREEMPT_RT patch under XEN, but running into some problem. > > My kernel is 3.4.3 with -r11 patch. XEN is 4.1.2. The kernel is running file as dom0. But as a Paravirtual (PV) domU, the system crashes normal when there is network traffic. kernel message indicates is kernel/rtmutex_common.h:75, which is, > > BUG_ON(w->lock != lock); > > Is this a known problem? I would consider this hopeless. Xen will not get you RT performance nor full preemption, so there is no point in running RT on Xen. Use KVM Sven > > Thanks! > > Dong > > PS. Here is the kernel message > > [ 144.871050] kernel BUG at kernel/rtmutex_common.h:75! > [ 144.871052] invalid opcode: 0000 [#1] PREEMPT SMP > [ 144.871054] CPU 0 > [ 144.871054] Modules linked in: 8021q garp stp llc sunrpc binfmt_misc uinput coretemp crc32c_intel microcode xen_netfront pcspkr x\ > en_blkfront [last unloaded: scsi_wait_scan] > [ 144.871060] > [ 144.871062] Pid: 3, comm: ksoftirqd/0 Not tainted 3.4.3-1.el6.alu_preempt_rt.x86_64-rt11 #1 > [ 144.871064] RIP: e030:[<ffffffff810bb538>] [<ffffffff810bb538>] wakeup_next_waiter+0x98/0xa0 > [ 144.871071] RSP: e02b:ffff88003e1f1dc0 EFLAGS: 00010096 > [ 144.871072] RAX: ffff88003fc00068 RBX: ffff88003fc0c360 RCX: 0000000000000001 > [ 144.871073] RDX: 0000000000003978 RSI: 0000000000000000 RDI: ffffffff81cf5368 > [ 144.871075] RBP: ffff88003e1f1df0 R08: 0000000000000001 R09: 0000000000000000 > [ 144.871076] R10: 0000000000000004 R11: 0000000000000000 R12: ffff88003e1ee788 > [ 144.871077] R13: ffffffff81cf5350 R14: ffff88003e1ee0c0 R15: ffff88003fc00068 > [ 144.871081] FS: 00007fc492e307c0(0000) GS:ffff88003fc00000(0000) knlGS:0000000000000000 > [ 144.871083] CS: e033 DS: 0000 ES: 0000 CR0: 000000008005003b > [ 144.871084] CR2: 0000003d8be2c0f0 CR3: 00000000397bf000 CR4: 0000000000002660 > [ 144.871086] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 > [ 144.871088] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 > [ 144.871089] Process ksoftirqd/0 (pid: 3, threadinfo ffff88003e1f0000, task ffff88003e1ee0c0) > [ 144.871090] Stack: > [ 144.871091] ffff88003e1f0000 ffff88003fc0c360 0000000000000000 000000000000c360 > [ 144.871094] ffff88003e1ee0c0 ffff88003e1f0010 ffff88003e1f1e10 ffffffff81611e18 > [ 144.871096] 0000000000000000 ffff88003fc0c360 ffff88003e1f1e20 ffffffff81612419 > [ 144.871097] Call Trace: > [ 144.871102] [<ffffffff81611e18>] rt_spin_lock_slowunlock+0x28/0xa0 > [ 144.871105] [<ffffffff81612419>] rt_spin_unlock+0x29/0x40 > [ 144.871108] [<ffffffff81064515>] __thread_do_softirq+0xe5/0x150 > [ 144.871110] [<ffffffff81064669>] run_ksoftirqd+0xe9/0x1e0 > [ 144.871112] [<ffffffff81064580>] ? __thread_do_softirq+0x150/0x150 > [ 144.871114] [<ffffffff81064580>] ? __thread_do_softirq+0x150/0x150 > [ 144.871117] [<ffffffff8108092e>] kthread+0x9e/0xb0 > [ 144.871119] [<ffffffff8108e4f9>] ? finish_task_switch+0x49/0xf0 > [ 144.871122] [<ffffffff8161b064>] kernel_thread_helper+0x4/0x10 > [ 144.871124] [<ffffffff81612b7c>] ? retint_restore_args+0x5/0x6 > [ 144.871126] [<ffffffff8161b060>] ? gs_change+0x13/0x13 > [ 144.871127] Code: c0 0f b6 c0 48 89 43 18 e8 a6 73 55 00 4c 89 ef e8 4e ff ff ff 48 8b 5d d8 4c 8b 65 e0 4c 8b 6d e8 4c 8b 75 f0 \ > 4c 8b 7d f8 c9 c3 <0f> 0b eb fe 0f 1f 40 00 55 48 89 e5 66 83 07 01 bf 01 00 00 00 > [ 144.871140] RIP [<ffffffff810bb538>] wakeup_next_waiter+0x98/0xa0 > [ 144.871142] RSP <ffff88003e1f1dc0> > -- > To unsubscribe from this list: send the line "unsubscribe linux-rt-users" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html -- To unsubscribe from this list: send the line "unsubscribe linux-rt-users" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
