[Nouveau] [Bug 99505] Attempting to reclock GeForce GT740M (GK208) cause GPU and system to hang

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=99505

--- Comment #6 from Boyan Ding <stu_dby at 126.com> ---
(In reply to Ilia Mirkin from comment #5)
> (In reply to Boyan Ding from comment #3)
> > I tried to reclock while running glxgears (the AC line shows 405 MHz instead
> > of 0), but it also hangs.
> 
> Hmmm... this is probably a different issue then. To double-check, try
> booting with nouveau.runpm=0 (which will disable all the runpm stuff).
> 
> Either way, please try to figure out where the echo gets stuck (you can echo
> ... something into sysrq-trigger, I forget what... 'w' maybe?)

I added nouveau.runpm=0 and it still hangs, sysrq-trigger with w shows the
following:

[  169.926880] sysrq: SysRq : Show Blocked State
[  169.926883]   task                        PC stack   pid father
[  169.926954] kworker/1:123   D ffff880242063c90     0   315      2 0x00000000
[  169.926982] Workqueue: events nvkm_pstate_work [nouveau]
[  169.926984]  ffff880242063c90 00ff880239628b00 ffff880244a59c80
ffff880242048000
[  169.926987]  ffffffffa06e1cec ffff880242064000 ffff88024210c800
ffff880239628a80
[  169.926989]  ffff88024456ad00 0000000000000009 ffff880242063ca8
ffffffff815f40ec
[  169.926992] Call Trace:
[  169.927012]  [<ffffffffa06e1cec>] ? memx_out+0x3c/0x90 [nouveau]
[  169.927014]  [<ffffffff815f40ec>] schedule+0x3c/0x90
[  169.927032]  [<ffffffffa06e1b8a>] nvkm_pmu_send+0x24a/0x2c0 [nouveau]
[  169.927035]  [<ffffffff810c0450>] ? wake_atomic_t_function+0x60/0x60
[  169.927051]  [<ffffffffa06e1fa8>] nvkm_memx_fini+0xe8/0xf0 [nouveau]
[  169.927064]  [<ffffffffa068ff5f>] ? nvkm_boolopt+0x2f/0x190 [nouveau]
[  169.927080]  [<ffffffffa06c2a4b>] gk104_ram_prog+0x9b/0xc0 [nouveau]
[  169.927095]  [<ffffffffa06a4014>] nvkm_pstate_work+0x154/0x540 [nouveau]
[  169.927097]  [<ffffffff810a3277>] ? finish_task_switch+0x77/0x1e0
[  169.927100]  [<ffffffff81095ef5>] process_one_work+0x1e5/0x470
[  169.927102]  [<ffffffff810961c8>] worker_thread+0x48/0x4e0
[  169.927104]  [<ffffffff81096180>] ? process_one_work+0x470/0x470
[  169.927106]  [<ffffffff8109be38>] kthread+0xd8/0xf0
[  169.927108]  [<ffffffff8102c782>] ? __switch_to+0x2d2/0x630
[  169.927110]  [<ffffffff815f823f>] ret_from_fork+0x1f/0x40
[  169.927112]  [<ffffffff8109bd60>] ? kthread_worker_fn+0x170/0x170
[  169.927217] bash            D ffff8802202afb60     0  1863   1862 0x00000000
[  169.927220]  ffff8802202afb60 00ff88020e930000 ffff880244a59c80
ffff88020e930000
[  169.927222]  0000000000000246 ffff8802202b0000 ffff88024210b948
0000000000000008
[  169.927225]  ffff88024210b800 0000000000000028 ffff8802202afb78
ffffffff815f40ec
[  169.927227] Call Trace:
[  169.927229]  [<ffffffff815f40ec>] schedule+0x3c/0x90
[  169.927244]  [<ffffffffa06a3cdb>] nvkm_pstate_calc+0x7b/0xd0 [nouveau]
[  169.927246]  [<ffffffff810c0450>] ? wake_atomic_t_function+0x60/0x60
[  169.927260]  [<ffffffffa06a4598>] nvkm_clk_ustate+0x98/0xb0 [nouveau]
[  169.927277]  [<ffffffffa06f0235>] nvkm_control_mthd+0x315/0x440 [nouveau]
[  169.927290]  [<ffffffffa068f2e8>] nvkm_object_mthd+0x18/0x20 [nouveau]
[  169.927302]  [<ffffffffa068daa6>] nvkm_ioctl_mthd+0x66/0xb0 [nouveau]
[  169.927314]  [<ffffffffa068e3b7>] nvkm_ioctl+0x107/0x260 [nouveau]
[  169.927329]  [<ffffffffa07382d2>] nvkm_client_ioctl+0x12/0x20 [nouveau]
[  169.927341]  [<ffffffffa068b041>] nvif_object_ioctl+0x41/0x50 [nouveau]
[  169.927352]  [<ffffffffa068b3e8>] nvif_object_mthd+0x138/0x160 [nouveau]
[  169.927354]  [<ffffffff81217c7c>] ? path_openat+0x31c/0x1170
[  169.927356]  [<ffffffff81316e4b>] ? _kstrtoull+0x3b/0x90
[  169.927371]  [<ffffffffa07352fe>] nouveau_debugfs_pstate_set+0x12e/0x1c0
[nouveau]
[  169.927373]  [<ffffffff812993c0>] full_proxy_write+0x60/0xa0
[  169.927375]  [<ffffffff81208797>] __vfs_write+0x37/0x140
[  169.927378]  [<ffffffff81227bc9>] ? __alloc_fd+0xc9/0x180
[  169.927379]  [<ffffffff81206dd6>] ? filp_close+0x56/0x80
[  169.927382]  [<ffffffff810c7be7>] ? percpu_down_read+0x17/0x50
[  169.927384]  [<ffffffff81209566>] vfs_write+0xb6/0x1a0
[  169.927385]  [<ffffffff8120a9e5>] SyS_write+0x55/0xc0
[  169.927387]  [<ffffffff81227e92>] ? __close_fd+0x92/0xb0
[  169.927389]  [<ffffffff815f8032>] entry_SYSCALL_64_fastpath+0x1a/0xa4

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