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+id = 1864
+title = "x86 VM with TCG and SMP fails to start on 8.1.0"
+state = "closed"
+created_at = "2023-09-05T07:48:14.136Z"
+closed_at = "2023-09-22T15:35:27.591Z"
+labels = ["Stable::to backport", "accel: TCG", "target: i386"]
+url = "https://gitlab.com/qemu-project/qemu/-/issues/1864"
+host-os = "Mac OS Ventura"
+host-arch = "ARM"
+qemu-version = "8.1.0"
+guest-os = "Linux"
+guest-arch = "x86_64"
+description = """I'm running Colima on MacOS to run Docker. After upgrading qemu to 8.1.0 my x86_64 VM fails to start. If I downgrade qemu to 8.0.4 everything runs normally. Relevant logs:
+
+```
+[   60.976187] rcu: \t0-...!: (0 ticks this GP) idle=0d58/0/0x0 softirq=44/44 fqs=0 (false positive?)
+[   60.979262] \t(detected by 1, t=6005 jiffies, g=-1171, q=1981 ncpus=2)
+[   60.982317] Sending NMI from CPU 1 to CPUs 0:
+[   11.583693] NMI backtrace for cpu 0 skipped: idling at native_safe_halt+0xb/0x10
+[   11.583693] INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 2.006 msecs
+[   60.982317] rcu: rcu_preempt kthread timer wakeup didn't happen for 6004 jiffies! g-1171 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
+[   60.982317] rcu: \tPossible timer handling issue on cpu=0 timer-softirq=15
+[   60.982317] rcu: rcu_preempt kthread starved for 6005 jiffies! g-1171 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->cpu=0
+[   60.982317] rcu: \tUnless rcu_preempt kthread gets sufficient CPU time, OOM is now expected behavior.
+[   60.982317] rcu: RCU grace-period kthread stack dump:
+[   60.982317] task:rcu_preempt     state:I stack:0     pid:15    ppid:2      flags:0x00004000
+```
+
+[serial.log](/uploads/1039eceff37133504eb93401df1db137/serial.log)"""
+reproduce = """1. `colima start --arch x86_64`"""
+additional = "n/a"