Date: Sat, 05 Nov 2016 22:07:20 +0000 From: bugzilla-noreply@freebsd.org To: freebsd-bugs@FreeBSD.org Subject: [Bug 213856] Fatal trap12: page fault while in kernel mode; Supervisor read data, page not present Message-ID: <bug-213856-8-Cv2tzcUDJE@https.bugs.freebsd.org/bugzilla/> In-Reply-To: <bug-213856-8@https.bugs.freebsd.org/bugzilla/> References: <bug-213856-8@https.bugs.freebsd.org/bugzilla/>
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D213856 --- Comment #13 from Mark Johnston <markj@FreeBSD.org> --- In both cases, we crashed in bucket_drain() when resetting bucket->ub_cnt t= o 0: 0xffffffff80e17d90 <+256>: movslq %r13d,%r13 0xffffffff80e17d93 <+259>: mov 0x18(%rbx,%r13,8),%rdi 0xffffffff80e17d98 <+264>: mov 0x10c(%r14),%esi 0xffffffff80e17d9f <+271>: callq *0xe8(%r14) 0xffffffff80e17da6 <+278>: inc %r13d 0xffffffff80e17da9 <+281>: movswl 0x10(%rbx),%eax 0xffffffff80e17dad <+285>: cmp %eax,%r13d 0xffffffff80e17db0 <+288>: jl 0xffffffff80e17d90 <bucket_cache_drain+256> 0xffffffff80e17db2 <+290>: mov 0x100(%r14),%rdi 0xffffffff80e17db9 <+297>: movswl %ax,%edx 0xffffffff80e17dbc <+300>: mov %r12,%rsi 0xffffffff80e17dbf <+303>: callq *0xf8(%r14) 0xffffffff80e17dc6 <+310>: movw $0x0,0x10(%rbx) <-- rbx is a callee-saved register that is dereferenced after every call to uz_fini, so it seems as though the uz_release function for the zone is somehow corrupting its frame. Because this is happening in the context of uma_reclaim(), we kn= ow that this can't be a cache zone, so uz_release is zone_release(). --=20 You are receiving this mail because: You are the assignee for the bug.=
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