Hi Jesse,
0day kernel testing robot got the below dmesg and the first bad commit is
git://people.freedesktop.org/~jbarnes/linux async-fb-probe commit b739c9982801e5f76097311b67dfd76891b10988 Author: Jesse Barnes jbarnes@virtuousgeek.org AuthorDate: Wed May 28 10:21:17 2014 -0700 Commit: Jesse Barnes jbarnes@virtuousgeek.org CommitDate: Wed May 28 12:17:34 2014 -0700
drm: take modeset locks around initial fb helper probing Drivers ought to complain otherwise. Signed-off-by: Jesse Barnes jbarnes@virtuousgeek.org
+------------------------------------------+------------+------------+ | | 071f9c57ee | b739c99828 | +------------------------------------------+------------+------------+ | boot_successes | 60 | 0 | | boot_failures | 0 | 20 | | INFO:possible_recursive_locking_detected | 0 | 20 | | BUG:kernel_boot_hang | 0 | 20 | | backtrace:drm_fb_helper_initial_config | 0 | 20 | | backtrace:cirrus_fbdev_init | 0 | 20 | | backtrace:cirrus_modeset_init | 0 | 20 | | backtrace:__pci_register_driver | 0 | 20 | | backtrace:drm_pci_init | 0 | 20 | | backtrace:cirrus_init | 0 | 20 | | backtrace:kernel_init_freeable | 0 | 20 | +------------------------------------------+------------+------------+
[ 4.328875] [TTM] Initializing pool allocator [ 4.329713] [ 4.329843] ============================================= [ 4.330272] [ INFO: possible recursive locking detected ] [ 4.330294] 3.15.0-rc5-00087-gb739c99 #636 Not tainted [ 4.330294] --------------------------------------------- [ 4.330294] swapper/1 is trying to acquire lock: [ 4.330294] (&dev->mode_config.mutex){+.+.+.}, at: [<8158fa28>] drm_modeset_lock_all+0x28/0xa0 [ 4.330294] [ 4.330294] but task is already holding lock: [ 4.330294] (&dev->mode_config.mutex){+.+.+.}, at: [<8157720e>] drm_fb_helper_initial_config+0x6e/0x890 [ 4.330294] [ 4.330294] other info that might help us debug this: [ 4.330294] Possible unsafe locking scenario: [ 4.330294] [ 4.330294] CPU0 [ 4.330294] ---- [ 4.330294] lock(&dev->mode_config.mutex); [ 4.330294] lock(&dev->mode_config.mutex); [ 4.330294] [ 4.330294] *** DEADLOCK *** [ 4.330294] [ 4.330294] May be due to missing lock nesting notation [ 4.330294] [ 4.330294] 4 locks held by swapper/1: [ 4.330294] #0: (&dev->mutex){......}, at: [<81770e9c>] __driver_attach+0x7c/0x140 [ 4.330294] #1: (&dev->mutex){......}, at: [<81770eb6>] __driver_attach+0x96/0x140 [ 4.330294] #2: (drm_global_mutex){+.+.+.}, at: [<81587f89>] drm_dev_register+0x29/0x210 [ 4.330294] #3: (&dev->mode_config.mutex){+.+.+.}, at: [<8157720e>] drm_fb_helper_initial_config+0x6e/0x890 [ 4.330294] [ 4.330294] stack backtrace: [ 4.330294] CPU: 0 PID: 1 Comm: swapper Not tainted 3.15.0-rc5-00087-gb739c99 #636 [ 4.330294] 82772bd0 91c25b70 81c8091f 91c25bf0 810a75e6 82031095 91c1922c 00000001 [ 4.330294] e891fd4b 00000004 91c19478 82772bd0 00000000 91c19000 91c19478 8274ddb8 [ 4.330294] 82543d00 91c25bcc 0000073c 00000000 00000000 00000000 00000001 91c19478 [ 4.330294] Call Trace: [ 4.330294] [<81c8091f>] dump_stack+0x40/0x5e [ 4.330294] [<810a75e6>] validate_chain.isra.25+0xe66/0x1f70 [ 4.330294] [<8109a413>] ? sched_clock_cpu+0x153/0x1c0 [ 4.330294] [<810ae42e>] __lock_acquire+0x149e/0x1780 [ 4.330294] [<810ae42e>] ? __lock_acquire+0x149e/0x1780 [ 4.330294] [<810ae865>] lock_acquire+0x155/0x1d0 [ 4.330294] [<8158fa28>] ? drm_modeset_lock_all+0x28/0xa0 [ 4.330294] [<81c9f2a9>] mutex_lock_nested+0x99/0x6a0 [ 4.330294] [<8158fa28>] ? drm_modeset_lock_all+0x28/0xa0 [ 4.330294] [<8158fa28>] ? drm_modeset_lock_all+0x28/0xa0 [ 4.330294] [<8157720e>] ? drm_fb_helper_initial_config+0x6e/0x890 [ 4.330294] [<8157720e>] ? drm_fb_helper_initial_config+0x6e/0x890 [ 4.330294] [<8158fa28>] drm_modeset_lock_all+0x28/0xa0 [ 4.330294] [<81577223>] drm_fb_helper_initial_config+0x83/0x890 [ 4.330294] [<810a97b2>] ? trace_hardirqs_on_caller+0x2d2/0x420 [ 4.330294] [<810a9927>] ? trace_hardirqs_on+0x27/0x40 [ 4.330294] [<8158fa78>] ? drm_modeset_lock_all+0x78/0xa0 [ 4.330294] [<8156f4fe>] ? drm_helper_encoder_in_use+0xe/0x130 [ 4.330294] [<8158fad9>] ? drm_modeset_unlock_all+0x39/0x80 [ 4.330294] [<8174a06c>] cirrus_fbdev_init+0x10c/0x130 [ 4.330294] [<8174917b>] cirrus_modeset_init+0x27b/0x340 [ 4.330294] [<81747483>] cirrus_driver_load+0x113/0x1d0 [ 4.330294] [<81588047>] drm_dev_register+0xe7/0x210 [ 4.330294] [<8158ba80>] drm_get_pci_dev+0x200/0x340 [ 4.330294] [<8118a93d>] ? slob_free+0x5dd/0x610 [ 4.330294] [<81749416>] cirrus_pci_probe+0x126/0x160 [ 4.330294] [<81338b7a>] pci_device_probe+0xda/0x1f0 [ 4.330294] [<8120eef5>] ? sysfs_create_link+0x25/0x40 [ 4.330294] [<81770b9f>] really_probe+0x16f/0x3f0 [ 4.330294] [<81770ef9>] __driver_attach+0xd9/0x140 [ 4.330294] [<81770e20>] ? really_probe+0x3f0/0x3f0 [ 4.330294] [<8176d932>] bus_for_each_dev+0xb2/0x140 [ 4.330294] [<817705cc>] driver_attach+0x2c/0x40 [ 4.330294] [<81770e20>] ? really_probe+0x3f0/0x3f0 [ 4.330294] [<8176ead9>] bus_add_driver+0x129/0x3e0 [ 4.330294] [<81771855>] driver_register+0x165/0x1f0 [ 4.330294] [<8249f39c>] ? mgag200_init+0x4f/0x4f [ 4.330294] [<81338cf6>] __pci_register_driver+0x66/0x80 [ 4.330294] [<8158bc4b>] drm_pci_init+0x8b/0x1b0 [ 4.330294] [<8249f39c>] ? mgag200_init+0x4f/0x4f [ 4.330294] [<8249f3d3>] cirrus_init+0x37/0x4f [ 4.330294] [<82458598>] do_one_initcall+0xf4/0x21e [ 4.330294] [<81080016>] ? parameq+0x26/0x110 [ 4.330294] [<812dd939>] ? strlen+0x9/0x40 [ 4.330294] [<82457735>] ? repair_env_string+0x32/0xd3 [ 4.330294] [<81080522>] ? parse_args+0x422/0x610 [ 4.330294] [<824588ca>] kernel_init_freeable+0x208/0x38b [ 4.330294] [<82457703>] ? do_early_param+0x12b/0x12b [ 4.330294] [<81c77fee>] kernel_init+0x1e/0x220 [ 4.330294] [<81094e0f>] ? schedule_tail+0x1f/0xa0 [ 4.330294] [<81ca7700>] ret_from_kernel_thread+0x20/0x30 [ 4.330294] [<81c77fd0>] ? rest_init+0x180/0x180 [ 61.921707] spin_lock-torture: Writes: Total: 2 Max/Min: 0/0 Fail: 0 [ 82.580118] random: nonblocking pool is initialized [ 121.920851] spin_lock-torture: Writes: Total: 2 Max/Min: 0/0 Fail: 0 git bisect start 05f78283c03d79d7d03af2ba7570156c71ba9b0d c7208164e66f63e3ec1759b98087849286410741 -- git bisect good 8bc69a36895ecd9f0f7304b71d5dee85c5c35ee4 # 02:59 20+ 0 Merge 'jbarnes/pm-fixes' into devel-roam-i386-201405300201 git bisect good 369cef62bbd75688f151851a939b827391c8e62f # 03:12 20+ 0 Merge 'wireless-next/master' into devel-roam-i386-201405300201 git bisect bad fcb2133e3b5207d456c048ac4008681e012bb410 # 03:35 0- 5 Merge 'jbarnes/async-fb-probe' into devel-roam-i386-201405300201 git bisect bad b739c9982801e5f76097311b67dfd76891b10988 # 03:52 0- 6 drm: take modeset locks around initial fb helper probing git bisect good 071f9c57eea4876288ba1254c9ac3b0f077c2dd6 # 04:07 20+ 0 drm/i915/vlv: enable PPGTT # first bad commit: [b739c9982801e5f76097311b67dfd76891b10988] drm: take modeset locks around initial fb helper probing git bisect good 071f9c57eea4876288ba1254c9ac3b0f077c2dd6 # 04:10 60+ 0 drm/i915/vlv: enable PPGTT git bisect bad 05f78283c03d79d7d03af2ba7570156c71ba9b0d # 04:10 0- 13 0day head guard for 'devel-roam-i386-201405300201' git bisect good f2159d1e99612ceb94bf9a2dc2fbca409d828b1b # 04:18 60+ 0 Merge tag 'sound-3.15-rc8' of git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound git bisect good 07dd999f99b1135fdece697e17c4f4248ab40f72 # 04:27 60+ 60 Add linux-next specific files for 20140529
This script may reproduce the error.
----------------------------------------------------------------------------- #!/bin/bash
kernel=$1 initrd=quantal-core-i386.cgz
wget --no-clobber https://github.com/fengguang/reproduce-kernel-bug/blob/master/initrd/$initrd
kvm=( qemu-system-x86_64 -cpu kvm64 -enable-kvm -kernel $kernel -initrd $initrd -smp 2 -m 256M -net nic,vlan=0,macaddr=00:00:00:00:00:00,model=virtio -net user,vlan=0 -net nic,vlan=1,model=e1000 -net user,vlan=1 -boot order=nc -no-reboot -watchdog i6300esb -serial stdio -display none -monitor null )
append=( debug sched_debug apic=debug ignore_loglevel sysrq_always_enabled panic=10 prompt_ramdisk=0 earlyprintk=ttyS0,115200 console=ttyS0,115200 console=tty0 vga=normal root=/dev/ram0 rw )
"${kvm[@]}" --append "${append[*]}" -----------------------------------------------------------------------------
Thanks, Jet