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Date:      Tue, 02 Nov 2021 19:48:40 +0000
From:      bugzilla-noreply@freebsd.org
To:        fs@FreeBSD.org
Subject:   [Bug 228750] panic on zfs mirror removal
Message-ID:  <bug-228750-3630-8CmZ7xZNIY@https.bugs.freebsd.org/bugzilla/>
In-Reply-To: <bug-228750-3630@https.bugs.freebsd.org/bugzilla/>
References:  <bug-228750-3630@https.bugs.freebsd.org/bugzilla/>

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D228750

Ahmed <ahmedsayeed1982@yahoo.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |ahmedsayeed1982@yahoo.com

--- Comment #22 from Ahmed <ahmedsayeed1982@yahoo.com> ---
------8<-------
 1 size_t fwrite(const void * __restrict ptr, size_t size,
http://www-look-4.com/category/travel/
 2               size_t nmemb, register FILE * __restrict stream)
 3 {
 4     size_t retval; https://komiya-dental.com/category/technology/
 5     __STDIO_AUTO_THREADLOCK_VAR;
 6  http://www.iu-bloomington.com/category/technology/
 7 >   __STDIO_AUTO_THREADLOCK(stream);
 8=20
 9     retval =3D fwrite_unlocked(ptr, size, nmemb, stream);
10  https://waytowhatsnext.com/category/technology/
11     __STDIO_AUTO_THREADUNLOCK(stream);
12  http://www.wearelondonmade.com/category/travel/
13     return retval;
14 }
------>8-------
 http://www.jopspeech.com/category/travel/
Here, we are at line 7. Using the "next" command leads no where. However,
setting a breakpoint on line 9 and issuing "continue" works.
http://joerg.li/category/travel/
Looking at the assembly instructions reveals that we're dealing with the
critical section entry code http://the-hunters.org/technology/meta-symbol/ =
[1]
that should never be interrupted, in this
case by the debugger's implicit breakpoints:
http://connstr.net/category/travel/

------8<-------
  ... http://embermanchester.uk/category/travel/
1 add_s   r0,r13,0x38
2 mov_s   r3,1
3 llock   r2,[r0]        <-.
4 brne.nt r2,0,14     --.  | http://www.slipstone.co.uk/category/travel/
5 scond   r3,[r0]       |  |
6 bne     -10         --|--'
7 brne_s  r2,0,84     <-' http://www.logoarts.co.uk/category/travel/
  ...
------>8-------
 http://www.acpirateradio.co.uk/category/travel/
Lines 3 until 5 (inclusive) are supposed to be executed atomically. Therefo=
re,
http://fishingnewsletters.co.uk/crypto/kelleci-bay/
GDB should never (implicitly) insert a breakpoint on lines 4 and 5, else the
http://www.compilatori.com/category/travel/=20
program will try to acquire the lock again by jumping back to line 3 and
gets stuck in an infinite loop. https://www.webb-dev.co.uk/category/technol=
ogy/

The solution is to make GDB aware of these patterns so it inserts breakpoin=
ts
after the sequence -- line 6 in this example. The solution is to make GDB a=
ware
of these patterns so it inserts breakpoints
http://www.go-mk-websites.co.uk/services/kyoto/
after the sequence -- line 6 in this example.
 The solution is to make GDB aware of these patterns so it inserts breakpoi=
nts
after the sequence -- line 6 in this example.
http://www.mconstantine.co.uk/services/new-zealand/
The solution is to make GDB aware of these patterns so it inserts breakpoin=
ts
after the sequence -- line 6 in this example.

--=20
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