Andres Freund writes:
> On 2022-11-30 18:33:06 -0500, Tom Lane wrote:
>> Even if somebody comes up with a rewrite to avoid doing interesting stuff in
>> the postmaster's signal handlers, we surely wouldn't risk back-patching it.
> Would that actually fix anything, given netbsd's brokenness? If we
Hi,
On 2022-11-30 18:33:06 -0500, Tom Lane wrote:
> Also, I dug into my stuck processes some more, and I have to take
> back the claim that this is happening later than postmaster startup.
> All the stuck children are ones that either are launched on request
> from the startup process, or are laun
Andres Freund writes:
> On 2022-11-30 00:55:42 -0500, Tom Lane wrote:
>> Googling LD_BIND_NOW suggests that that's a Linux thing; do you know that
>> it should have an effect on NetBSD?
> I'm not at all sure it does, but I did see it listed in
> https://man.netbsd.org/ld.elf_so.1
> LD_BIND_N
Hi,
On 2022-11-29 22:31:50 -0800, Andres Freund wrote:
> On 2022-11-30 00:55:42 -0500, Tom Lane wrote:
> > Andres Freund writes:
> > > What libraries is postgres linked against? I don't know whether -z now
> > > only
> > > affects the "top-level" dependencies of postgres, or also the
> > > depe
Hi,
On 2022-11-30 00:55:42 -0500, Tom Lane wrote:
> Andres Freund writes:
> > What libraries is postgres linked against? I don't know whether -z now only
> > affects the "top-level" dependencies of postgres, or also the dependencies
> > of
> > shared libraries that haven't been built with -z now
Andres Freund writes:
> On 2022-11-29 20:44:34 -0500, Tom Lane wrote:
>> It's also strange that we're apparently running with signals enabled
>> whereever it is that rtld_bind is getting called from. Could it be that
>> sigaction is failing to install the requested signal mask, so that one
>> pos
Hi,
On 2022-11-29 20:44:34 -0500, Tom Lane wrote:
> It's also strange that we're apparently running with signals enabled
> whereever it is that rtld_bind is getting called from. Could it be that
> sigaction is failing to install the requested signal mask, so that one
> postmaster signal handler i
Andres Freund writes:
> On 2022-11-29 20:44:34 -0500, Tom Lane wrote:
>> Backtrace stopped: frame did not save the PC
> Do you have any idea why the stack can't be unwound further here? Is it
> possibly indicative of a corrupted stack? I guess we'd need to dig into
> the netbsd libc code :(
I di
Hi,
On 2022-11-29 20:44:34 -0500, Tom Lane wrote:
> Thanks to commit 51b5834cd I've now been able to capture some info
> from mamba's last couple of failures [1][2]. Sure enough, what is
> happening is that postmaster children are getting stuck in recursive
> rtld symbol resolution. A couple of
On Wed, Nov 30, 2022 at 3:43 PM Thomas Munro wrote:
> sigaction(0, NULL, &mask)
s/sigaction/sigprocmask/
On Wed, Nov 30, 2022 at 2:44 PM Tom Lane wrote:
> Now, we certainly cannot think that these are occurring early in
> postmaster startup. In the wake of 8acd8f869, we should expect
> that there's no further need to call rtld_bind at all in the
> postmaster, but seemingly that's not so. It's very
I wrote:
> Thomas Munro writes:
>> On Fri, Nov 18, 2022 at 11:08 AM Tom Lane wrote:
>>> mamba has been showing intermittent failures in various replication
>>> tests since day one.
>> I wonder if it's a runtime variant of the other problem. We do
>> load_file("libpqwalreceiver", false) before u
I wrote:
> Andres Freund writes:
>> I suspect that having a GUC would be a good idea. I needed something similar
>> recently, debugging an occasional hang in the AIO patchset. I first tried
>> something like your #define approach and it did cause a problematic flood of
>> core files.
> Yeah, the
Andres Freund writes:
> On 2022-11-17 17:47:50 -0500, Tom Lane wrote:
>> So I'd like to have some way to make the postmaster send SIGABRT instead
>> of SIGKILL in the buildfarm environment. The lowest-tech way would be
>> to drive that off some #define or other. We could scale it up to a GUC
>>
Hi,
On 2022-11-17 17:47:50 -0500, Tom Lane wrote:
> Yeah, that or some other NetBSD bug could be the explanation, too.
> Without a stack trace it's hard to have any confidence about it,
> but I've been unable to reproduce the problem outside the buildfarm.
> (Which is a familiar refrain. I wonder
On Fri, Nov 18, 2022 at 11:35 AM Thomas Munro wrote:
> I wonder if it's a runtime variant of the other problem. We do
> load_file("libpqwalreceiver", false) before unblocking signals but
> maybe don't resolve the symbols until calling them, or something like
> that...
Hmm, no, I take that back.
Thomas Munro writes:
> On Fri, Nov 18, 2022 at 11:08 AM Tom Lane wrote:
>> mamba has been showing intermittent failures in various replication
>> tests since day one.
> I wonder if it's a runtime variant of the other problem. We do
> load_file("libpqwalreceiver", false) before unblocking signal
On Fri, Nov 18, 2022 at 11:08 AM Tom Lane wrote:
> Thomas Munro writes:
> > I wonder why the walreceiver didn't start in
> > 008_min_recovery_point_node_3.log here:
> > https://buildfarm.postgresql.org/cgi-bin/show_log.pl?nm=mamba&dt=2022-11-16%2023%3A13%3A38
>
> mamba has been showing intermitte
Thomas Munro writes:
> I wonder why the walreceiver didn't start in
> 008_min_recovery_point_node_3.log here:
> https://buildfarm.postgresql.org/cgi-bin/show_log.pl?nm=mamba&dt=2022-11-16%2023%3A13%3A38
mamba has been showing intermittent failures in various replication
tests since day one. My g
Hi,
I wonder why the walreceiver didn't start in
008_min_recovery_point_node_3.log here:
https://buildfarm.postgresql.org/cgi-bin/show_log.pl?nm=mamba&dt=2022-11-16%2023%3A13%3A38
There was the case of commit 8acd8f86, but that involved a deadlocked
postmaster whereas this one still handled a sh
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