uvm_fault(0xffffffff83a9ffc8, 0xffff8000137d2004, 0, 1) -> d
kernel: page fault trap, code=0
Stopped at      ffs_fragextend+0x1c8:   movl    0x4(%rbx),%r14d
    TID    PID    UID     PRFLAGS     PFLAGS  CPU  COMMAND
*341541  78437      0           0  0x4000001    0K syz-executor
ffs_fragextend(fffffd806e552890,1,2ad78,3000,3800) at ffs_fragextend+0x1c8 ffs_cgread sys/ufs/ffs/ffs_alloc.c:856 [inline]
ffs_fragextend(fffffd806e552890,1,2ad78,3000,3800) at ffs_fragextend+0x1c8 sys/ufs/ffs/ffs_alloc.c:890
ffs_realloccg(fffffd806e552890,b,2ad00,3000,3800,fffffd80097fd340,ce9b81fc518aad4a,fffffd806846f570) at ffs_realloccg+0x53a sys/ufs/ffs/ffs_alloc.c:225
ffs2_balloc(fffffd806e552890,2effd,50,fffffd80097fd340,1,ffff80003c3ed3a8) at ffs2_balloc+0x54d sys/ufs/ffs/ffs_balloc.c:516
ffs_write(ffff80003c3ed430) at ffs_write+0x4f9 sys/ufs/ffs/ffs_vnops.c:345
VOP_WRITE(fffffd807b325398,ffff80003c3ed4e0,3,fffffd80097fd340) at VOP_WRITE+0x101 sys/kern/vfs_vops.c:245
ktrwriteraw(ffff8000397b9a18,fffffd807b325398,fffffd80097fd340,ffff80003c3ed5b0,ffff80003c3ed590) at ktrwriteraw+0x1be sys/kern/kern_ktrace.c:692
ktrsysret(ffff8000397b9a18,36,0,ffff80003c3ed680) at ktrsysret+0x192 ktrwrite2 sys/kern/kern_ktrace.c:-1 [inline]
ktrsysret(ffff8000397b9a18,36,0,ffff80003c3ed680) at ktrsysret+0x192 sys/kern/kern_ktrace.c:209
syscall(ffff80003c3ed730) at syscall+0xa51 mi_syscall_return sys/sys/syscall_mi.h:204 [inline]
syscall(ffff80003c3ed730) at syscall+0xa51 sys/arch/amd64/amd64/trap.c:804
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x2e116969350, count: 6
https://www.openbsd.org/ddb.html describes the minimum info required in bug
reports.  Insufficient info makes it difficult to find and fix bugs.
ddb{0}> 
ddb{0}> set $lines = 0
ddb{0}> set $maxwidth = 0
ddb{0}> show panic
*cpu0: uvm_fault(0xffffffff83a9ffc8, 0xffff8000137d2004, 0, 1) -> d
ddb{0}>