Per git bisect, the fix for this should be:
commit 6c971c09f38704513c426ba6515f22fb3d6c87d5
Author: Y.C. Chen <yc_c...@aspeedtech.com>
Date: Thu Jan 26 09:45:40 2017 +0800
drm/ast: Fixed system hanged if disable P2A
The original ast driver will access some BMC configuration through P2A
bridge
that can be disabled since AST2300 and after.
It will cause system hanged if P2A bridge is disabled.
Here is the update to fix it.
Signed-off-by: Y.C. Chen <yc_c...@aspeedtech.com>
Signed-off-by: Dave Airlie <airl...@redhat.com>
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https://bugs.launchpad.net/bugs/1788817
Title:
BUG: soft lockup - CPU#0 stuck for 23s! [kworker/0:1:1119]
Status in linux package in Ubuntu:
Incomplete
Bug description:
Booting Trusty with kernel 3.13.0-156-generic on a fairly new Intel
box results in stuck CPU warnings:
[ 33.551942] BUG: soft lockup - CPU#0 stuck for 23s! [kworker/0:1:1119]
[ 33.558560] Modules linked in: hid_generic ast(+) crct10dif_pclmul
syscopyarea crc32_pclmul sysfillrect ghash_clmulni_intel sysimgblt aesni_intel
i2c_algo_bit aes_x86_64 lrw ttm gf128mul glue_helper drm_kms_helper ablk_helper
usbhid cryptd ahci drm hid libahci wmi
[ 33.583971] CPU: 0 PID: 1119 Comm: kworker/0:1 Not tainted
3.13.0-156-generic #206-Ubuntu
[ 33.592270] Hardware name: Intel Corporation S2600WFT/S2600WFT, BIOS
SE5C620.86B.01.00.0294.101220161543 10/12/2016
[ 33.602836] Workqueue: events work_for_cpu_fn
[ 33.607351] task: ffff88084ddbc6b0 ti: ffff88084dd98000 task.ti:
ffff88084dd98000
[ 33.614957] RIP: 0010:[<ffffffff81383bb2>] [<ffffffff81383bb2>]
ioread32+0x42/0x50
[ 33.622805] RSP: 0018:ffff88084dd99d18 EFLAGS: 00000292
[ 33.628201] RAX: 00000000ffffffff RBX: ffff880851265000 RCX:
00000000000028a6
[ 33.635429] RDX: ffffc90016bd0000 RSI: ffffc90016bd0000 RDI:
ffffc90016bd0000
[ 33.642653] RBP: ffff88084dd99d40 R08: 0000000000000092 R09:
000000000000079e
[ 33.649877] R10: ffffffff813df570 R11: ffff88084dd99a46 R12:
0000000016bc0000
[ 33.657104] R13: ffffffffa01b2ab0 R14: ffff88084dd99cc8 R15:
0000000000000000
[ 33.664329] FS: 0000000000000000(0000) GS:ffff88085f200000(0000)
knlGS:0000000000000000
[ 33.672541] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 33.678380] CR2: 00007f3613be4000 CR3: 0000000001c0e000 CR4:
0000000000360770
[ 33.685605] DR0: 0000000000000000 DR1: 0000000000000000 DR2:
0000000000000000
[ 33.692829] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7:
0000000000000400
[ 33.700052] Stack:
[ 33.702150] ffffffffa01a89e0 ffff880851265000 0000000000000000
0000000000000000
[ 33.709948] ffffffffa01b4100 ffff88084dd99d68 ffffffffa0073e88
ffff880851265000
[ 33.717751] ffff880850dee000 ffff880850dee098 ffff88084dd99db8
ffffffffa0075d92
[ 33.725550] Call Trace:
[ 33.728085] [<ffffffffa01a89e0>] ? ast_driver_load+0x320/0x540 [ast]
[ 33.734634] [<ffffffffa0073e88>] drm_dev_register+0xa8/0x1f0 [drm]
[ 33.741000] [<ffffffffa0075d92>] drm_get_pci_dev+0x92/0x140 [drm]
[ 33.747268] [<ffffffffa01a81e5>] ast_pci_probe+0x15/0x20 [ast]
[ 33.753282] [<ffffffff813b5f5a>] local_pci_probe+0x4a/0xb0
[ 33.758947] [<ffffffff8108746a>] work_for_cpu_fn+0x1a/0x30
[ 33.764613] [<ffffffff8108a5fe>] process_one_work+0x17e/0x480
[ 33.770536] [<ffffffff8108b5ab>] worker_thread+0x29b/0x410
[ 33.776205] [<ffffffff8108b310>] ? rescuer_thread+0x430/0x430
[ 33.782130] [<ffffffff810922cb>] kthread+0xcb/0xf0
[ 33.787101] [<ffffffff81092200>] ? kthread_create_on_node+0x1c0/0x1c0
[ 33.793721] [<ffffffff8174758e>] ret_from_fork+0x6e/0xa0
[ 33.799211] [<ffffffff81092200>] ? kthread_create_on_node+0x1c0/0x1c0
[ 33.805828] Code: 66 0f 1f 84 00 00 00 00 00 55 48 c7 c6 80 57 a9 81 48 89
e5 e8 f0 fe ff ff b8 ff ff ff ff 5d c3 66 0f 1f 84 00 00 00 00 00 8b 07 <c3> 66
66 66 66 2e 0f 1f 84 00 00 00 00 00 48 81 fe ff ff 03 00
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