id = 1846
title = "Regression in q35 avocado tests due to fix for misaligned IO access"
state = "closed"
created_at = "2023-08-25T14:42:44.886Z"
closed_at = "2023-08-30T16:22:37.487Z"
labels = ["Closed::Fixed", "accel: TCG", "host: x86", "kind::Bug", "target: i386"]
url = "https://gitlab.com/qemu-project/qemu/-/issues/1846"
host-os = "Ubuntu"
host-arch = "x64"
qemu-version = "8.1"
guest-os = "Linux"
guest-arch = "x86_64 (under TCG)"
description = """Generally I'm seeing intermittent hangs, somewhere after the clock initialisation.

```
[    4.137020] ALSA device list:                                                                                                                                             
[    4.137861]   No soundcards found.                                                                                                                                        
[    4.634128] input: ImExPS/2 Generic Explorer Mouse as /devices/platform/i8042/serio1/input/input3                                                                         
[   24.085574] rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
[   24.085712] rcu:     0-...!: (0 ticks this GP) idle=4d18/0/0x0 softirq=54/54 fqs=0 (false positive?)
[   24.085712]  (detected by 1, t=21004 jiffies, g=-1003, q=2151 ncpus=2)
[   24.085712] Sending NMI from CPU 1 to CPUs 0:                                                                                                                             
[    4.647507] NMI backtrace for cpu 0                                                                                                                                       
[    4.647507] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 6.0.11 #5                                                                                                           
[    4.647507] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.16.2-0-gea1b7a073390-prebuilt.qemu.org 04/01/2014                                              
[    4.647507] RIP: 0010:amd_e400_idle+0x39/0x40                                                                                                                             
[    4.647507] Code: 00 e8 fb ab 0d 00 eb 07 0f 00 2d c2 7d 1d 01 fb f4 fa 31 ff e8 e8 ab 0d 00 fb c3 cc cc cc cc eb 07 0f 00 2d a9 7d 1d 01 fb f4 <c3> cc cc cc cc 66 90 bf 
01 00 00 00 e8 a6 e4 06 00 65 48 8b 04 25
```

In avocado the hang generally times out and the test fails."""
reproduce = """See above command line. It's racy."""
additional = """"""