Message-ID: <20141218170349.GC9298@wfg-t540p.sh.intel.com>
Date:	Thu, 18 Dec 2014 09:03:49 -0800
From:	Fengguang Wu <fengguang.wu@...el.com>
To:	Thierry Reding <treding@...dia.com>
Cc:	Daniel Vetter <daniel.vetter@...ll.ch>, LKP <lkp@...org>,
	dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: [drm/fb-helper] WARNING: CPU: 1 PID: 1 at lib/idr.c:506 idr_remove()

Greetings,

0day kernel testing robot got the below dmesg and the first bad commit is

git://anongit.freedesktop.org/drm-intel topic/core-stuff

commit 7bf2844ed14de049a4ccec26eb3d8b4c3d5c1971
Author:     Thierry Reding <treding@...dia.com>
AuthorDate: Wed Dec 17 16:39:59 2014 +0100
Commit:     Daniel Vetter <daniel.vetter@...ll.ch>
CommitDate: Wed Dec 17 22:05:08 2014 +0100

    drm/fb-helper: Propagate errors from initial config failure
    
    Make drm_fb_helper_initial_config() return an int rather than a bool so
    that the error can be properly propagated. While at it, update drivers
    to propagate errors further rather than just ignore them.
    
    Cc: David Airlie <airlied@...ux.ie>
    Cc: Daniel Vetter <daniel.vetter@...ll.ch>
    Cc: Patrik Jakobsson <patrik.r.jakobsson@...il.com>
    Cc: Rob Clark <robdclark@...il.com>
    Cc: Tomi Valkeinen <tomi.valkeinen@...com>
    Cc: Alex Deucher <alexander.deucher@....com>
    Cc: Christian König <christian.koenig@....com>
    Cc: Ben Skeggs <bskeggs@...hat.com>
    Signed-off-by: Thierry Reding <treding@...dia.com>
    Reviewed-by: Alex Deucher <alexander.deucher@....com>
    Reviewed-by: Patrik Jakobsson <patrik.r.jakobsson@...il.com>
    Signed-off-by: Daniel Vetter <daniel.vetter@...ll.ch>

Attached dmesg for the parent commit, too, to help confirm whether it is a noise error.
Judging from the kernel boot hang timestamps, that looks like an noise.

+------------------------------------------------+------------+------------+------------+
|                                                | 7552e7dd95 | 7bf2844ed1 | 7bf2844ed1 |
+------------------------------------------------+------------+------------+------------+
| boot_successes                                 | 0          | 0          | 0          |
| boot_failures                                  | 80         | 12         | 12         |
| BUG:kernel_boot_hang                           | 80         |            |            |
| WARNING:at_lib/idr.c:#idr_remove()             | 0          | 12         | 12         |
| RIP:strcmp                                     | 0          | 5          | 5          |
| Kernel_panic-not_syncing:softlockup:hung_tasks | 0          | 11         | 11         |
| backtrace:__pci_register_driver                | 0          | 12         | 12         |
| backtrace:drm_pci_init                         | 0          | 12         | 12         |
| backtrace:cirrus_init                          | 0          | 12         | 12         |
| backtrace:kernel_init_freeable                 | 0          | 12         | 12         |
| backtrace:i2c_register_driver                  | 0          | 5          | 5          |
| backtrace:bh1780_driver_init                   | 0          | 2          | 2          |
| RIP:kset_find_obj                              | 0          | 6          | 6          |
| backtrace:i2o_pci_init                         | 0          | 2          | 2          |
| backtrace:i2o_iop_init                         | 0          | 2          | 2          |
| backtrace:lm3642_i2c_driver_init               | 0          | 1          | 1          |
| BUG:kernel_test_hang                           | 0          | 1          | 1          |
| backtrace:usb_register_driver                  | 0          | 2          | 2          |
| backtrace:hanwang_driver_init                  | 0          | 2          | 2          |
| backtrace:__gameport_register_driver           | 0          | 1          | 1          |
| backtrace:grip_drv_init                        | 0          | 1          | 1          |
| backtrace:w83l785ts_driver_init                | 0          | 2          | 2          |
| backtrace:spi_register_driver                  | 0          | 1          | 1          |
| backtrace:dac7512_driver_init                  | 0          | 1          | 1          |
+------------------------------------------------+------------+------------+------------+

[    4.754439] cirrus 0000:00:02.0: Fatal error during modeset init: -22
[    4.756061] ------------[ cut here ]------------
[    4.756061] ------------[ cut here ]------------
[    4.756800] WARNING: CPU: 1 PID: 1 at lib/idr.c:506 idr_remove+0x384/0x3b0()
[    4.756800] WARNING: CPU: 1 PID: 1 at lib/idr.c:506 idr_remove+0x384/0x3b0()
[    4.758132] idr_remove called for id=20 which is not allocated.
[    4.758132] idr_remove called for id=20 which is not allocated.
[    4.759056] CPU: 1 PID: 1 Comm: swapper/0 Not tainted 3.18.0-rc4-g7bf2844 #20
[    4.759056] CPU: 1 PID: 1 Comm: swapper/0 Not tainted 3.18.0-rc4-g7bf2844 #20
[    4.760184]  0000000000000009
[    4.760184]  0000000000000009 ffff88001147fa08 ffff88001147fa08 ffffffff824ce992 ffffffff824ce992 ffffffff81151538 ffffffff81151538

[    4.761391]  ffff88001147fa58
[    4.761391]  ffff88001147fa58 ffff88001147fa48 ffff88001147fa48 ffffffff810dac1a ffffffff810dac1a ffff88001147fa78 ffff88001147fa78

[    4.762593]  ffff88001147fac8
[    4.762593]  ffff88001147fac8 ffff880012c916f8 ffff880012c916f8 ffff880012d01310 ffff880012d01310 ffff880012c91060 ffff880012c91060

[    4.763796] Call Trace:
[    4.763796] Call Trace:
[    4.764187]  [<ffffffff824ce992>] dump_stack+0x86/0xbc
[    4.764187]  [<ffffffff824ce992>] dump_stack+0x86/0xbc
[    4.764995]  [<ffffffff81151538>] ? console_unlock+0x3b8/0x7a0
[    4.764995]  [<ffffffff81151538>] ? console_unlock+0x3b8/0x7a0
[    4.765908]  [<ffffffff810dac1a>] warn_slowpath_common+0x9a/0xd0
[    4.765908]  [<ffffffff810dac1a>] warn_slowpath_common+0x9a/0xd0
[    4.766846]  [<ffffffff810dace1>] warn_slowpath_fmt+0x51/0x60
[    4.766846]  [<ffffffff810dace1>] warn_slowpath_fmt+0x51/0x60
[    4.767740]  [<ffffffff819b7c7c>] ? drm_mode_object_put+0x2c/0x70
[    4.767740]  [<ffffffff819b7c7c>] ? drm_mode_object_put+0x2c/0x70
[    4.768689]  [<ffffffff8170f7c4>] idr_remove+0x384/0x3b0
[    4.768689]  [<ffffffff8170f7c4>] idr_remove+0x384/0x3b0
[    4.769521]  [<ffffffff81738039>] ? debug_check_no_obj_freed+0x29/0x40
[    4.769521]  [<ffffffff81738039>] ? debug_check_no_obj_freed+0x29/0x40
[    4.770551]  [<ffffffff819b7c94>] drm_mode_object_put+0x44/0x70
[    4.770551]  [<ffffffff819b7c94>] drm_mode_object_put+0x44/0x70
[    4.771473]  [<ffffffff819c1bba>] drm_mode_destroy+0x2a/0x50
[    4.771473]  [<ffffffff819c1bba>] drm_mode_destroy+0x2a/0x50
[    4.772358]  [<ffffffff8199d155>] drm_fb_helper_crtc_free+0xc5/0x110
[    4.772358]  [<ffffffff8199d155>] drm_fb_helper_crtc_free+0xc5/0x110
[    4.773348]  [<ffffffff8199e724>] drm_fb_helper_fini+0x74/0xc0
[    4.773348]  [<ffffffff8199e724>] drm_fb_helper_fini+0x74/0xc0
[    4.774259]  [<ffffffff81cbaa73>] cirrus_fbdev_fini+0x193/0x230
[    4.774259]  [<ffffffff81cbaa73>] cirrus_fbdev_fini+0x193/0x230
[    4.775186]  [<ffffffff81cb98c9>] cirrus_modeset_fini+0x19/0x50
[    4.775186]  [<ffffffff81cb98c9>] cirrus_modeset_fini+0x19/0x50
[    4.776117]  [<ffffffff81cb7afb>] cirrus_driver_unload+0x2b/0x80
[    4.776117]  [<ffffffff81cb7afb>] cirrus_driver_unload+0x2b/0x80
[    4.777061]  [<ffffffff81cb7c97>] cirrus_driver_load+0x147/0x220
[    4.777061]  [<ffffffff81cb7c97>] cirrus_driver_load+0x147/0x220
[    4.778004]  [<ffffffff819b0515>] drm_dev_register+0x115/0x1c0
[    4.778004]  [<ffffffff819b0515>] drm_dev_register+0x115/0x1c0
[    4.778917]  [<ffffffff819b3c8c>] drm_get_pci_dev+0xcc/0x300
[    4.778917]  [<ffffffff819b3c8c>] drm_get_pci_dev+0xcc/0x300
[    4.779807]  [<ffffffff824e3361>] ? mutex_unlock+0x11/0x20
[    4.779807]  [<ffffffff824e3361>] ? mutex_unlock+0x11/0x20
[    4.780675]  [<ffffffff81cb9b7a>] cirrus_pci_probe+0x13a/0x180
[    4.780675]  [<ffffffff81cb9b7a>] cirrus_pci_probe+0x13a/0x180
[    4.781586]  [<ffffffff817893fc>] pci_device_probe+0xbc/0x180
[    4.781586]  [<ffffffff817893fc>] pci_device_probe+0xbc/0x180
[    4.782482]  [<ffffffff81e470bb>] really_probe+0x7b/0x340
[    4.782482]  [<ffffffff81e470bb>] really_probe+0x7b/0x340
[    4.783327]  [<ffffffff81e47481>] __driver_attach+0x101/0x110
[    4.783327]  [<ffffffff81e47481>] __driver_attach+0x101/0x110
[    4.784228]  [<ffffffff81e47380>] ? really_probe+0x340/0x340
[    4.784228]  [<ffffffff81e47380>] ? really_probe+0x340/0x340
[    4.785110]  [<ffffffff81e4477b>] bus_for_each_dev+0xab/0x100
[    4.785110]  [<ffffffff81e4477b>] bus_for_each_dev+0xab/0x100
[    4.786004]  [<ffffffff81e477a1>] driver_attach+0x21/0x30
[    4.786004]  [<ffffffff81e477a1>] driver_attach+0x21/0x30
[    4.786846]  [<ffffffff81e458a0>] bus_add_driver+0x2a0/0x3e0
[    4.786846]  [<ffffffff81e458a0>] bus_add_driver+0x2a0/0x3e0
[    4.787721]  [<ffffffff81e48397>] driver_register+0xa7/0x190
[    4.787721]  [<ffffffff81e48397>] driver_register+0xa7/0x190
[    4.788618]  [<ffffffff8178988f>] __pci_register_driver+0x6f/0x80
[    4.788618]  [<ffffffff8178988f>] __pci_register_driver+0x6f/0x80
[    4.789564]  [<ffffffff819b3ff9>] drm_pci_init+0x139/0x170
[    4.789564]  [<ffffffff819b3ff9>] drm_pci_init+0x139/0x170
[    4.790445]  [<ffffffff839234c6>] ? mgag200_init+0x3c/0x3c
[    4.790445]  [<ffffffff839234c6>] ? mgag200_init+0x3c/0x3c
[    4.791306]  [<ffffffff839234f9>] cirrus_init+0x33/0x3c
[    4.791306]  [<ffffffff839234f9>] cirrus_init+0x33/0x3c
[    4.792129]  [<ffffffff838d88d6>] do_one_initcall+0x176/0x247
[    4.792129]  [<ffffffff838d88d6>] do_one_initcall+0x176/0x247
[    4.793030]  [<ffffffff838d8b79>] kernel_init_freeable+0x1d2/0x2d4
[    4.793030]  [<ffffffff838d8b79>] kernel_init_freeable+0x1d2/0x2d4
[    4.793999]  [<ffffffff824c2750>] ? rest_init+0x130/0x130
[    4.793999]  [<ffffffff824c2750>] ? rest_init+0x130/0x130
[    4.794847]  [<ffffffff824c2761>] kernel_init+0x11/0x1a0
[    4.794847]  [<ffffffff824c2761>] kernel_init+0x11/0x1a0
[    4.795676]  [<ffffffff824e7f3c>] ret_from_fork+0x7c/0xb0
[    4.795676]  [<ffffffff824e7f3c>] ret_from_fork+0x7c/0xb0
[    4.796523]  [<ffffffff824c2750>] ? rest_init+0x130/0x130
[    4.796523]  [<ffffffff824c2750>] ? rest_init+0x130/0x130
[    4.797374] ---[ end trace 84335bfc53d465fe ]---
[    4.797374] ---[ end trace 84335bfc53d465fe ]---

git bisect start 7bf2844ed14de049a4ccec26eb3d8b4c3d5c1971 955289c7cfad158dc939e150896a240f549ccc60 --
git bisect good a18c0af171bfb875012da26f23df051004726973  # 06:09     20+     20  drm: Zero out DRM object memory upon cleanup
git bisect good ae28290be3871969fc3f64b480d42575a16ae990  # 06:21     20+     20  drm: bit of spell-check / editorializing.
git bisect good 05acaec334fcc1132d1e48c5042e044651e0b75b  # 06:32     20+     20  drm: Reorganize probed mode validation
git bisect good 261ea74f3689a997502f1264494f1749951a05a8  # 06:47     20+     20  drm: Remove stale comment
git bisect good 6d11a2f00724d52b988b5fedc6e6a050e1a46389  # 06:59     20+     20  drm: Make drm_crtc_helper.h standalone includible
git bisect good 7552e7dd9527c41f891c87854418896eaf309c20  # 07:07     20+     20  drm: Include drm_crtc_helper.h in DocBook
# first bad commit: [7bf2844ed14de049a4ccec26eb3d8b4c3d5c1971] drm/fb-helper: Propagate errors from initial config failure
git bisect good 7552e7dd9527c41f891c87854418896eaf309c20  # 07:13     60+     80  drm: Include drm_crtc_helper.h in DocBook
# extra tests on HEAD of drm-intel/topic/core-stuff
git bisect  bad 7bf2844ed14de049a4ccec26eb3d8b4c3d5c1971  # 07:13      0-     12  drm/fb-helper: Propagate errors from initial config failure
# extra tests on tree/branch drm-intel/topic/core-stuff
git bisect  bad 7bf2844ed14de049a4ccec26eb3d8b4c3d5c1971  # 07:13      0-     12  drm/fb-helper: Propagate errors from initial config failure
# extra tests on tree/branch linus/master
git bisect good 87c31b39abcb6fb6bd7d111200c9627a594bf6a9  # 07:19     60+     64  Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace
# extra tests on tree/branch next/master
git bisect good 5fef85d456eedf616809f7bf722b6f6a782d8a93  # 07:30     60+     60  Add linux-next specific files for 20141217


This script may reproduce the error.

----------------------------------------------------------------------------
#!/bin/bash

kernel=$1
initrd=quantal-core-x86_64.cgz

wget --no-clobber https://github.com/fengguang/reproduce-kernel-bug/raw/master/initrd/$initrd

kvm=(
	qemu-system-x86_64
	-cpu kvm64
	-enable-kvm
	-kernel $kernel
	-initrd $initrd
	-m 320
	-smp 2
	-net nic,vlan=1,model=e1000
	-net user,vlan=1
	-boot order=nc
	-no-reboot
	-watchdog i6300esb
	-rtc base=localtime
	-serial stdio
	-display none
	-monitor null 
)

append=(
	hung_task_panic=1
	earlyprintk=ttyS0,115200
	debug
	apic=debug
	sysrq_always_enabled
	rcupdate.rcu_cpu_stall_timeout=100
	panic=-1
	softlockup_panic=1
	nmi_watchdog=panic
	oops=panic
	load_ramdisk=2
	prompt_ramdisk=0
	console=ttyS0,115200
	console=tty0
	vga=normal
	root=/dev/ram0
	rw
	drbd.minor_count=8
)

"${kvm[@]}" --append "${append[*]}"
----------------------------------------------------------------------------

Thanks,
Fengguang

View attachment "dmesg-quantal-client6-7:20141218055208:x86_64-randconfig-n0-12152252:3.18.0-rc4-g7bf2844:20" of type "text/plain" (90104 bytes)

View attachment "dmesg-quantal-client6-10:20141218071302:x86_64-randconfig-n0-12152252:3.18.0-rc4-g7552e7d:30" of type "text/plain" (89333 bytes)

View attachment "config-3.18.0-rc4-g7bf2844" of type "text/plain" (85585 bytes)

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