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Re: USB deadlock?
Thomas Klausner <tk%giga.or.at@localhost> wrote:
>I'm doing my backups to USB disks. Last month this worked fine, with
>9.99.48/amd64 the backup process (unison) hung twice, only
>force-reboot got me out of the first one.
>The process is hung in ps "D+". top says "uvn_fp".
I don't have an answer to the hang but had been meaning to submit a
patch for review that might help with tracking it down.
There are two candidates for this wait point but the first six
characters of the names are the same, I just took out one character
so that top(1) could tell them apart.
I haven't seen any problems using it.
RCS file: /cvsroot/src/sys/uvm/uvm_vnode.c,v
retrieving revision 1.107
diff -u -r1.107 uvm_vnode.c
--- uvm_vnode.c 27 Feb 2020 22:12:54 -0000 1.107
+++ uvm_vnode.c 3 Mar 2020 12:49:55 -0000
@@ -314,7 +314,7 @@
@@ -339,7 +339,7 @@
UVMHIST_LOG(ubchist, "wait %#jx (color %ju)",
(uintptr_t)pg, VM_PGCOLOR(pg), 0, 0);
UVM_UNLOCK_AND_WAIT_RW(pg, uobj->vmobjlock, 0,
- "uvn_fp2", 0);
+ "uvnfp2", 0);
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