Re: kern/56900: panic in uvm_map_findspace

["John D. Baker" <jdbaker%consolidated.net@localhost>]

The following reply was made to PR kern/56900; it has been noted by GNATS.

From: "John D. Baker" <jdbaker%consolidated.net@localhost>
To: gnats-bugs%NetBSD.org@localhost
Cc: 
Subject: Re: kern/56900: panic in uvm_map_findspace
Date: Wed, 6 Jul 2022 09:02:06 -0500 (CDT)

 I think I've now run into the issue in this PR myself.
 
 While building "lang/openjdk17", the machine panicked with:
 
 [...]
 [ 85301.7124678] panic: kernel diagnostic assertion "!topdown || hint <= orig_hi
 nt" failed: file "/x/current/src/sys/uvm/uvm_map.c", line 1795 map=0xd0a400f4 hi
 nt=0xff900000 orig_hint=0x1524000 length=0xb3f00000 uobj=0x0 uoffset=0xfffffffff
 fffffff align=0 flags=0x80710 entry=0xd1dcbbc0 (uvm_map_findspace line 1998)
 [ 85301.7124678] cpu1: Begin traceback...
 [ 85301.7124678] vpanic(c08b18cc,f507ed44,f507ed8c,c059ecb5,c08b18cc,c0844aef,c0
 8b2272,c08b18a8,703,d0a400f4) at netbsd:vpanic+0x196
 [ 85301.7124678] kern_assert(c08b18cc,c0844aef,c08b2272,c08b18a8,703,d0a400f4,ff
 900000,1524000,b3f00000,0) at netbsd:kern_assert+0x23
 [ 85301.7124678] uvm_findspace_invariants(0,ffffffff,ffffffff,0,80710,ff900000,d
 1dcbbc0,7ce,f507edd8,f507ede4) at netbsd:uvm_findspace_invariants+0x93
 [ 85301.7124678] uvm_map_findspace(d0a400f4,ff900000,b3f00000,f507ee2c,0,fffffff
 f,ffffffff,0,80710,d0a400f8) at netbsd:uvm_map_findspace+0x1a2
 [ 85301.7124678] uvm_map_prepare(d0a400f4,1524000,b3f00000,0,ffffffff,ffffffff,0
 ,80710,f507ee50,d1da8d80) at netbsd:uvm_map_prepare+0x1e9
 [ 85301.7224689] uvm_map(d0a400f4,f507ef10,b3f00000,0,ffffffff,ffffffff,0,80710,
 d1dc0440,80000) at netbsd:uvm_map+0x76
 [ 85301.7224689] uvm_mmap.part.0(0,7,1042,0,0,ffffffff,ffffffff,3fd55000,e2f4734
 0,c05a1a9d) at netbsd:uvm_mmap.part.0+0x169
 [ 85301.7224689] sys_mmap(d1dc0440,f507ef68,f507ef60,e410b188,1,c5,f507ef60,f507
 ef68,0,0) at netbsd:sys_mmap+0x522
 [ 85301.7224689] syscall() at netbsd:syscall+0x17c
 [ 85301.7224689] --- syscall (number 197) ---
 [ 85301.7224689] b535e597:
 [ 85301.7224689] cpu1: End traceback...
 
 [ 85301.7224689] dumping to dev 0,1 offset 8726319
 [ 85301.7224689] dump <4>[ 85353.9914886] coretemp3: workqueue busy: updates sto
 pped
 
 
 System is amd64-class hardware running i386 distribution with custom
 PAE-enabled kernel.
 
 NetBSD plex760.technoskunk.fur 9.99.98 NetBSD 9.99.98 (PLEX760) #29: Tue Jun 21 09:36:01 CDT 2022  sysop%plex760.technoskunk.fur@localhost:/r0/build/current/obj/i386/sys/arch/i386/compile/PLEX760 i386
 
 # cpuctl identify 0
 cpu0: highest basic info 0000000a
 cpu0: highest extended info 80000008
 cpu0: "Intel(R) Core(TM)2 Quad  CPU   Q8200  @ 2.33GHz"
 cpu0: Intel Xeon 31xx, 33xx, 52xx, 54xx, Core 2 Quad 8xxx and 9xxx (686-class), 2327.50 MHz
 cpu0: family 0x6 model 0x17 stepping 0x7 (id 0x10677)
 cpu0: features 0xbfebfbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE>
 cpu0: features 0xbfebfbff<MCA,CMOV,PAT,PSE36,CLFSH,DS,ACPI,MMX,FXSR,SSE,SSE2>
 cpu0: features 0xbfebfbff<SS,HTT,TM,PBE>
 cpu0: features1 0x8e39d<SSE3,DTES64,MONITOR,DS-CPL,EST,TM2,SSSE3,CX16,xTPR>
 cpu0: features1 0x8e39d<PDCM,SSE41>
 cpu0: features2 0x20100000<XD,EM64T>
 cpu0: features3 0x1<LAHF>
 cpu0: I-cache: 32KB 64B/line 8-way, D-cache: 32KB 64B/line 8-way
 cpu0: L2 cache: 2MB 64B/line 8-way
 cpu0: 64B prefetching
 cpu0: ITLB: 128 4KB entries 4-way, 8 2M & 4 4M entries
 cpu0: DTLB: 256 4KB entries 4-way, 16 4MB entries 4-way
 cpu0: Initial APIC ID 0
 cpu0: Cluster/Package ID 0
 cpu0: Core ID 0
 cpu0: SMT ID 0
 cpu0: MONITOR/MWAIT extensions 0x3<EMX,IBE>
 cpu0: monitor-line size 64
 cpu0: C1 substates 2
 cpu0: DSPM-eax 0x1<DTS>
 cpu0: DSPM-ecx 0x1<HWF,NTDC=0>
 cpu0: SEF highest subleaf 00000000
 cpu0: Power Management features: 0
 cpu0: Perfmon: Ver. 2
 cpu0: Perfmon: General: bitwidth 40, 2 counters
 cpu0: Perfmon: General: avail 0x7f<CORECYCL,INST,REFCYCL,LLCREF,LLCMISS,BRINST>
 cpu0: Perfmon: General: avail 0x7f<BRMISPR>
 cpu0: Perfmon: Fixed: bitwidth 40, 3 counters
 cpu0: Perfmon: Fixed: avail 0x7<INST,CLK_CORETHREAD,CLK_REF_TSC>
 cpu0: microcode version 0x70a, platform ID 4
 
 
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