[  53.2330286] panic: kernel diagnostic assertion "requested_size > 0" failed: file "/syzkaller/managers/netbsd/kernel/sys/kern/subr_kmem.c", line 234 
[  53.2497673] cpu1: Begin traceback...
[  53.2569440] vpanic() at netbsd:vpanic+0x214
[  53.2689048] _GLOBAL__sub_D_65535_0_cpu_configure() at netbsd:_GLOBAL__sub_D_65535_0_cpu_configure
[  53.2856468] kmem_intr_alloc() at netbsd:kmem_intr_alloc+0x20c
[  53.2999978] kmem_alloc() at netbsd:kmem_alloc+0x4a
[  53.3119577] ufs_readdir() at netbsd:ufs_readdir+0x1c6
[  53.3239175] VOP_READDIR() at netbsd:VOP_READDIR+0xd2
[  53.3382719] vn_readdir() at netbsd:vn_readdir+0x1ff
[  53.3502294] sys___getdents30() at netbsd:sys___getdents30+0x157
[  53.3645792] sys___syscall() at netbsd:sys___syscall+0xe2
[  53.3789331] syscall() at netbsd:syscall+0x30e
[  53.3861067] --- syscall (number 198) ---
[  53.3932820] 74b6dbc3f4aa:
[  53.3956757] cpu1: End traceback...

[  53.4004583] dumping to dev 4,1 (offset=0, size=0): not possible
[  53.4076339] rebooting...
SeaBIOS (version 1.8.2-20181029_212248-google)
Total RAM Size = 0x00000001e0000000 = 7680 MiB
CPUs found: 2     Max CPUs supported: 2
found virtio-scsi at 0:3
virtio-scsi vendor='Google' product='PersistentDisk' rev='1' type=0 removable=0
virtio-scsi blksize=512 sectors=4194304 = 2048 MiB
drive 0x000f2a00: PCHS=0/0/0 translation=lba LCHS=520/128/63 s=4194304
Booting from Hard Disk 0...

>> NetBSD/x86 BIOS Boot, Revision 5.10 (Tue Jul 17 14:59:51 UTC 2018) (from NetBSD 8.0)
>> Memory: 639/3144640 k

     1. Boot normally
     2. Boot single user
     3. Disable ACPI
     4. Disable ACPI and SMP
     5. Drop to boot prompt
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/-\|/-\|/-\|/-\|/-\|/-\|/-\|WARNING: couldn't open /var/db/entropy-file
WARNING: 1 module failed to load
[   1.0000000] pool redzone disabled for 'pdppl'
[   1.0000000] pool redzone disabled for 'kmem-4096'
[   1.0000000] Copyright (c) 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005,
[   1.0000000]     2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017,
[   1.0000000]     2018, 2019 The NetBSD Foundation, Inc.  All rights reserved.
[   1.0000000] Copyright (c) 1982, 1986, 1989, 1991, 1993
[   1.0000000]     The Regents of the University of California.  All rights reserved.

[   1.0000000] NetBSD 8.99.34 (GENERIC_SYZKALLER) #7: Sun Feb 24 19:32:03 UTC 2019
[   1.0000000] 	root@ci2:/syzkaller/managers/netbsd/kernel/sys/arch/amd64/compile/obj/GENERIC_SYZKALLER
[   1.0000000] total memory = 7679 MB
[   1.0000000] avail memory = 6664 MB
[   1.0000000] pool redzone disabled for 'buf64k'
[   1.0000000] cpu_rng: RDRAND
[   1.0000000] running cgd selftest aes-xts-256 aes-xts-512 done
[   1.0000030] mainbus0 (root)
[   1.0000030] ACPI: RSDP 0x00000000000F2A40 000014 (v00 Google)
[   1.0000030] ACPI: RSDT 0x00000000BFFFDBA0 000038 (v01 Google GOOGRSDT 00000001 GOOG 00000001)
[   1.0000030] ACPI: FACP 0x00000000BFFFFF00 0000F4 (v02 Google GOOGFACP 00000001 GOOG 00000001)
[   1.0000030] ACPI: DSDT 0x00000000BFFFDBE0 0017B2 (v01 Google GOOGDSDT 00000001 GOOG 00000001)
[   1.0000030] ACPI: FACS 0x00000000BFFFFEC0 000040
[   1.0000030] ACPI: SSDT 0x00000000BFFFF590 000930 (v01 Google GOOGSSDT 00000001 GOOG 00000001)
[   1.0000030] ACPI: APIC 0x00000000BFFFF4A0 000076 (v01 Google GOOGAPIC 00000001 GOOG 00000001)
[   1.0000030] ACPI: WAET 0x00000000BFFFF470 000028 (v01 Google GOOGWAET 00000001 GOOG 00000001)
[   1.0000030] ACPI: SRAT 0x00000000BFFFF3A0 0000C8 (v01 Google GOOGSRAT 00000001 GOOG 00000001)
[   1.0000030] ACPI: 2 ACPI AML tables successfully acquired and loaded
[   1.0000030] ioapic0 at mainbus0 apid 0
[   1.0000030] cpu0 at mainbus0 apid 0
[   1.0000030] cpu0: Intel(R) Xeon(R) CPU @ 2.30GHz, id 0x306f0
[   1.0000030] cpu0: package 0, core 0, smt 0
[   1.0000030] cpu1 at mainbus0 apid 1
[   1.0000030] cpu1: Intel(R) Xeon(R) CPU @ 2.30GHz, id 0x306f0
[   1.0000030] cpu1: package 0, core 0, smt 1
[   1.0000030] acpi0 at mainbus0: Intel ACPICA 20181213