Hi, When suspending domU I get the following issue:
Freezing user space processes
Freezing user space processes failed after 20.004 seconds (1 tasks refusing
to freeze, wq_busy=0):
task:xl state:D stack:0 pid:466 tgid:466 ppid:1
task_flags:0x400040 flags:0x00004006
Call Trace:
<TASK>
__schedule+0x2f3/0x780
schedule+0x27/0x80
schedule_preempt_disabled+0x15/0x30
__mutex_lock.constprop.0+0x49f/0x880
unregister_xenbus_watch+0x216/0x230
xenbus_write_watch+0xb9/0x220
xenbus_file_write+0x131/0x1b0
vfs_writev+0x26c/0x3d0
? do_writev+0xeb/0x110
do_writev+0xeb/0x110
do_syscall_64+0x84/0x2c0
? do_syscall_64+0x200/0x2c0
? generic_handle_irq+0x3f/0x60
? syscall_exit_work+0x108/0x140
? do_syscall_64+0x200/0x2c0
? __irq_exit_rcu+0x4c/0xe0
entry_SYSCALL_64_after_hwframe+0x76/0x7e
RIP: 0033:0x79b618138642
RSP: 002b:00007fff9a192fc8 EFLAGS: 00000246 ORIG_RAX: 0000000000000014
RAX: ffffffffffffffda RBX: 00000000024fd490 RCX: 000079b618138642
RDX: 0000000000000003 RSI: 00007fff9a193120 RDI: 0000000000000014
RBP: 00007fff9a193000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000014
R13: 00007fff9a193120 R14: 0000000000000003 R15: 0000000000000000
</TASK>
OOM killer enabled.
Restarting tasks: Starting
Restarting tasks: Done
xen:manage: do_suspend: freeze processes failed -16
The process in question is `xl devd` daemon. It's a domU serving a
xenvif backend.
I noticed it on 6.16.1, but looking at earlier test logs I see it with
6.16-rc6 already (but interestingly, not 6.16-rc2 yet? feels weird given
seemingly no relevant changes between rc2 and rc6).
--
Best Regards,
Marek Marczykowski-Górecki
Invisible Things Lab
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