https://bugzilla.kernel.org/show_bug.cgi?id=113861
Bug ID: 113861 Summary: [radeon] Xorg fatal freeze upon startx Product: Drivers Version: 2.5 Kernel Version: 4.4.4, 4.1.18 LTS Hardware: All OS: Linux Tree: Mainline Status: NEW Severity: high Priority: P1 Component: Video(DRI - non Intel) Assignee: drivers_video-dri@kernel-bugs.osdl.org Reporter: 3db5to+dsqmzpq58ju3k@sharklasers.com Regression: No
Source of bug report: https://bugs.archlinux.org/task/48468 https://bbs.archlinux.org/viewtopic.php?id=209576
When startx is used to start Xorg on an Arch system booted to command line with radeon module, Xorg process is fully frozen and cannot be killed or terminated, with message: "waiting for X server to begin accepting connections... ... ..." etc. (CTRL-C 500 times to stop the polling, Xorg wrapper is unresponsive to kill -9)
This is happening on both 4.1.18 LTS and 4.4.4 (latter is vanilla + grsec). It is not happening on 4.4.3 from distribution (but pure vanilla not tried).
Does not occur if radeon is blacklisted and VESA used instead.
Two reports so far. Mine is switchable : [AMD/ATI] RS880M [Mobility Radeon HD 4225/4250] [AMD/ATI] Whistler [Radeon HD 6630M/6650M/6750M/7670M/7690M] Forum user: [AMD/ATI] Mars [Radeon HD 8730M] ... (see link)
Forum user recorded a stack trace (from his link https://gist.github.com/Bernolt/ae162d69444f9937610d):
[<ffffffff813f2151>] rpm_resume+0x171/0x660 [<ffffffff813f267f>] __pm_runtime_resume+0x3f/0x60 [<ffffffffa06b05c4>] radeon_dp_detect+0x64/0x2e0 [radeon] [<ffffffffa040c20a>] drm_helper_hpd_irq_event+0xaa/0x140 [drm_kms_helper] [<ffffffffa0688bec>] radeon_resume_kms+0x22c/0x420 [radeon] [<ffffffffa0686143>] radeon_pmops_runtime_resume+0x73/0xb0 [radeon] [<ffffffff8130517f>] pci_pm_runtime_resume+0x7f/0xc0 [<ffffffff813df139>] vga_switcheroo_runtime_resume+0x39/0x40 [<ffffffff813f10a4>] __rpm_callback+0x34/0x90 [<ffffffff813f1128>] rpm_callback+0x28/0x90 [<ffffffff813f2439>] rpm_resume+0x459/0x660 [<ffffffff813f267f>] __pm_runtime_resume+0x3f/0x60 [<ffffffffa068b016>] radeon_driver_open_kms+0x36/0x1d0 [radeon] [<ffffffffa035b7ef>] drm_open+0x1af/0x4c0 [drm] [<ffffffffa0362689>] drm_stub_open+0xa9/0x120 [drm] [<ffffffff811dc0e6>] chrdev_open+0xb6/0x1b0 [<ffffffff811d50a7>] do_dentry_open+0x227/0x330 [<ffffffff811d62e6>] vfs_open+0x56/0x60 [<ffffffff811e5bf4>] do_last.isra.11+0x344/0xf50 [<ffffffff811e6891>] path_openat+0x91/0x670 [<ffffffff811e82f9>] do_filp_open+0x49/0xd0 [<ffffffff811d66ed>] do_sys_open+0x14d/0x250 [<ffffffff811d680e>] SyS_open+0x1e/0x20 [<ffffffff8158256e>] system_call_fastpath+0x12/0x71 [<ffffffffffffffff>] 0xffffffffffffffff