syzbot

[   1.8118204] panic: UBSan: Undefined Behavior in /syzkaller/managers/netbsd-kubsan/kernel/sys/arch/x86/x86/pmap.c:545:9, member access within null pointer of type 'struct pv_entry'

[   1.8325318] cpu1: Begin traceback...
[   1.8425911] vpanic() at netbsd:vpanic+0x2aa sys/kern/subr_prf.c:336
[   1.8628501] isAlreadyReported() at netbsd:isAlreadyReported
[   1.8919415] HandleTypeMismatch.part.1() at netbsd:HandleTypeMismatch.part.1+0x15b
[   1.9124891] HandleTypeMismatch() at netbsd:HandleTypeMismatch+0x7b sys/../common/lib/libc/misc/ubsan.c:408
[   1.9428594] pmap_pp_clear_attrs() at netbsd:pmap_pp_clear_attrs+0x2fb pve_to_pvpte sys/arch/x86/x86/pmap.c:545 [inline]
[   1.9428594] pmap_pp_clear_attrs() at netbsd:pmap_pp_clear_attrs+0x2fb pv_pte_first sys/arch/x86/x86/pmap.c:567 [inline]
[   1.9428594] pmap_pp_clear_attrs() at netbsd:pmap_pp_clear_attrs+0x2fb sys/arch/x86/x86/pmap.c:3930
[   1.9625869] genfs_getpages() at netbsd:genfs_getpages+0x1fdd sys/miscfs/genfs/genfs_io.c:479
[   1.9929035] VOP_GETPAGES() at netbsd:VOP_GETPAGES+0x14b sys/kern/vnode_if.c:1596
[   2.0230871] uvn_get() at netbsd:uvn_get+0x1d4 sys/uvm/uvm_vnode.c:187
[   2.0522951] ubc_fault() at netbsd:ubc_fault+0x41a sys/uvm/uvm_bio.c:388
[   2.0723378] uvm_fault_internal() at netbsd:uvm_fault_internal+0x1026 sys/uvm/uvm_fault.c:890
[   2.0923811] trap() at netbsd:trap+0xe45 sys/arch/amd64/amd64/trap.c:538
[   2.1024038] --- trap (number 6) ---
[   2.1225194] kcopy() at netbsd:kcopy+0x15
[   2.1427877] uiomove() at netbsd:uiomove+0xd3 sys/kern/subr_copy.c:132
[   2.1636966] ubc_uiomove() at netbsd:ubc_uiomove+0x1c0 sys/uvm/uvm_bio.c:751
[   2.1825778] ffs_read() at netbsd:ffs_read+0x334 sys/ufs/ufs/ufs_readwrite.c:110
[   2.2128065] VOP_READ() at netbsd:VOP_READ+0x11b sys/kern/vnode_if.c:470
[   2.2327306] vn_rdwr() at netbsd:vn_rdwr+0x196 sys/kern/vfs_vnops.c:463
[   2.2529498] check_exec() at netbsd:check_exec+0x547 sys/kern/kern_exec.c:443
[   2.2730297] execve_loadvm() at netbsd:execve_loadvm+0x830 sys/kern/kern_exec.c:822
[   2.3037770] execve1() at netbsd:execve1+0x74 sys/kern/kern_exec.c:1419
[   2.3228833] sys_execve() at netbsd:sys_execve+0x4f sys/kern/kern_exec.c:588
[   2.3540683] start_init() at netbsd:start_init+0x400 sys/kern/init_main.c:1104
[   2.3629704] cpu1: End traceback...
[   2.3629704] fatal breakpoint trap in supervisor mode
[   2.3629704] trap type 1 code 0 rip 0xffffffff8021dddd cs 0x8 rflags 0x286 cr2 0xffffaf80a5c64000 ilevel 0 rsp 0xffffaf80a68ae950
[   2.3740766] curlwp 0xffffd2b1191e7a60 pid 1.1 lowest kstack 0xffffaf80a68ac2c0
Stopped in pid 1.1 (init) at    netbsd:breakpoint+0x5:  leave
db{1}>