QEMUv8: ftrace: xtest regression_1021 hang

[jforissier]

$ make CFG_FTRACE_SUPPORT=y CFG_SYSCALL_FTRACE=y CFLAGS_ta_arm64=-pg run

$ xtest regression_1021
[...]
o regression_1021.2 Single Instance Multi Sessions
[   38.313976] rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
[   38.315378] rcu:     0-...0: (1 GPs behind) idle=94ec/1/0x4000000000000000 softirq=582/583 fqs=2625
[   38.316345]  (detected by 1, t=5252 jiffies, g=109, q=8 ncpus=2)
[   38.317222] Task dump for CPU 0:
[   38.317546] task:xtest           state:R  running task     stack:0     pid:135   ppid:133    flags:0x00000002
[   38.318960] Call trace:
[   38.319257]  __switch_to+0xe4/0x160
[   38.320355]  irqtime_account_irq+0x64/0x17c
[   38.320624]  __irq_exit_rcu+0x20/0xf4
[   38.320991]  irq_exit_rcu+0x10/0x20
[   38.321274]  el1_interrupt+0x58/0x70
[   38.321539]  el1h_64_irq_handler+0x18/0x2c
[   38.321783]  el1h_64_irq+0x64/0x68
[   38.321968]  __arm_smccc_smc+0x14/0x40

[jforissier]

Bisected to c10e3fa.

[jenswi-linaro]

Thanks, I'll take a look.

[jenswi-linaro]

#6378 should take care of this.

By the way, passing CFLAGS_ta_arm64=-pg seems quite inconvenient. Couldn't that be done automatically with CFG_FTRACE_SUPPORT=y or something?

[jforissier]

By the way, passing CFLAGS_ta_arm64=-pg seems quite inconvenient. Couldn't that be done automatically with CFG_FTRACE_SUPPORT=y or something?

The purpose of each flag is different. CFG_FTRACE_SUPPORT enables ftrace support in the TEE core, while CFLAGS selects which TA we want to trace. With CFLAGS_ta_arm64=-pg all TAs are traced, but -pg could as well be added more selectively to a single TA or even a single source file in a TA.

[github-actions]

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