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 You are receiving this mail because: You are on the CC list for the bug.=
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