On Fri, Aug 22, 2025 at 04:39:33PM +0200, Marek Marczykowski-Górecki wrote: > 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).
I forgot to include link for (a little) more details: https://github.com/QubesOS/qubes-linux-kernel/pull/1157 Especially, there is another call trace with panic_on_warn enabled - slightly different, but looks related. -- Best Regards, Marek Marczykowski-Górecki Invisible Things Lab
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