"BUG: using smp_processor_id() in preemptible" on resume from S3

["Marek Marczykowski-Górecki" <marmarek@invisiblethingslab.com>]

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Hi,

After updating from 5.14.15 dom0 kernel to 5.16.13 I started getting
this on resume from S3:

[   88.082751] ACPI: PM: Low-level resume complete
[   88.087933] ACPI: EC: EC started
[   88.091464] ACPI: PM: Restoring platform NVS memory
[   88.097166] xen_acpi_processor: Uploading Xen processor PM info
[   88.103850] Enabling non-boot CPUs ...
[   88.108128] installing Xen timer for CPU 1
[   88.112763] BUG: using smp_processor_id() in preemptible [00000000] code: systemd-sleep/7138
[   88.122256] caller is is_xen_pmu+0x12/0x30
[   88.126937] CPU: 0 PID: 7138 Comm: systemd-sleep Tainted: G        W         5.16.13-2.fc32.qubes.x86_64 #1
[   88.137939] Hardware name: Star Labs StarBook/StarBook, BIOS 7.97 03/21/2022
[   88.145930] Call Trace:
[   88.148757]  <TASK>
[   88.151193]  dump_stack_lvl+0x48/0x5e
[   88.155381]  check_preemption_disabled+0xde/0xe0
[   88.160641]  is_xen_pmu+0x12/0x30
[   88.164441]  xen_smp_intr_init_pv+0x75/0x100
[   88.169311]  ? xen_read_cr0+0x20/0x20
[   88.173502]  xen_cpu_up_prepare_pv+0x3e/0x90
[   88.178374]  cpuhp_invoke_callback+0x2b8/0x460
[   88.183440]  ? _raw_spin_unlock_irqrestore+0x25/0x40
[   88.189093]  cpuhp_up_callbacks+0x4b/0x170
[   88.193769]  _cpu_up+0xba/0x140
[   88.197374]  thaw_secondary_cpus.cold+0x50/0xaa
[   88.202538]  suspend_enter+0x11e/0x3b0
[   88.206825]  suspend_devices_and_enter+0x165/0x270
[   88.212281]  enter_state+0x125/0x176
[   88.216372]  pm_suspend.cold+0x20/0x6b
[   88.220658]  state_store+0x27/0x50
[   88.224557]  kernfs_fop_write_iter+0x121/0x1b0
[   88.229621]  new_sync_write+0x159/0x1f0
[   88.234006]  vfs_write+0x20d/0x2a0
[   88.237904]  ksys_write+0x67/0xe0
[   88.241703]  do_syscall_64+0x38/0x90
[   88.245797]  entry_SYSCALL_64_after_hwframe+0x44/0xae
[   88.251544] RIP: 0033:0x7eae453da2f7
[   88.255637] Code: 0d 00 f7 d8 64 89 02 48 c7 c0 ff ff ff ff eb b7 0f 1f 00 f3 0f 1e fa 64 8b 04 25 18 00 00 00 85 c0 75 10 b8 01 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 51 c3 48 83 ec 28 48 89 54 24 18 48 89 74 24
[   88.276779] RSP: 002b:00007ffcbc7d05e8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
[   88.285353] RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 00007eae453da2f7
[   88.293438] RDX: 0000000000000004 RSI: 00007ffcbc7d06d0 RDI: 0000000000000004
[   88.301525] RBP: 00007ffcbc7d06d0 R08: 00005be912db7c00 R09: 000000000000000d
[   88.309613] R10: 00005be912db3e10 R11: 0000000000000246 R12: 0000000000000004
[   88.317699] R13: 00005be912db32d0 R14: 0000000000000004 R15: 00007eae454ac700
[   88.325787]  </TASK>
[   88.328711] cpu 1 spinlock event irq 131
[   88.333188] ACPI: \_SB_.CP01: Found 3 idle states
[   88.338833] CPU1 is up

and so on for all CPUs. 

In recent changes I see e25a8d959992 "x86/Xen: streamline (and fix) PV
CPU enumeration", which was backported to 5.16.11, although that's just
a hunch.

Any ideas? If necessary, I can run bisect to find specific commit, but I
hope the above message gives enough hints.

-- 
Best Regards,
Marek Marczykowski-Górecki
Invisible Things Lab

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