>> Issue debugged by Thomas Gleixner <tglx@xxxxxxxxxxxxx> The kernel crashed while I attempted preempt_rt support on log at: [ 1487.027884] I7: <rt_mutex_setprio+0x3c/0x2c0> [ 1487.027885] Call Trace: [ 1487.027887] [00000000004967dc] rt_mutex_setprio+0x3c/0x2c0 [ 1487.027892] [00000000004afe20] task_blocks_on_rt_mutex+0x180/0x200 [ 1487.027895] [0000000000819114] rt_spin_lock_slowlock+0x94/0x300 [ 1487.027897] [0000000000817ebc] __schedule+0x39c/0x53c [ 1487.027899] [00000000008185fc] schedule+0x1c/0xc0 [ 1487.027908] [000000000048fff4] smpboot_thread_fn+0x154/0x2e0 [ 1487.027913] [000000000048753c] kthread+0x7c/0xa0 [ 1487.027920] [00000000004060c4] ret_from_syscall+0x1c/0x2c [ 1487.027922] [0000000000000000] (null) Thomas debugged it and pointed me towards the fix. > > I think davem would appreciate if you add a little here than this. The > same goes for 3/3. > The same goes with 3/3 [ 2317.606015] [00000000008072f4] rt_spin_lock_slowlock+0x94/0x300 [ 2317.606020] [0000000000451d74] get_new_mmu_context+0x14/0x160 [ 2317.606026] [0000000000806394] switch_to_pc+0xd4/0x2a0 [ 2317.606029] [00000000008067dc] schedule+0x1c/0xc0 [ 2317.606031] [0000000000807364] rt_spin_lock_slowlock+0x104/0x300 [ 2317.606033] [0000000000450284] destroy_context+0x84/0x120 [ 2317.606036] [000000000045c788] __mmdrop+0x28/0xe0 [ 2317.606045] [00000000004bf290] rcu_process_callbacks+0x450/0x760 [ 2317.606049] [0000000000466d48] do_current_softirqs+0x208/0x3c0 [ 2317.606051] [0000000000466f14] run_ksoftirqd+0x14/0x40 [ 2317.606057] [000000000048c64c] smpboot_thread_fn+0x18c/0x2e0 [ 2317.606061] [0000000000483b5c] kthread+0x7c/0xa0 [ 2317.606069] [00000000004060c4] ret_from_syscall+0x1c/0x2c [ 2317.606070] [0000000000000000] (null) I am not sure if it'd be nice to put the call trace in the commit message. But if needed I can re-send them. - Allen -- To unsubscribe from this list: send the line "unsubscribe sparclinux" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
