pvn_getpages may assert in valid scenarios
The assertion tries to ensure that the page list is large enough for the result. However, it fails to take into consideration that the page list is optional - and that it that case the page list size will be less than the expected length.
> ::status debugging crash dump vmcore.0 (64-bit) from osiris operating system: 5.11 pvn-getpages (i86pc) image uuid: 52104cf6-9217-ce01-ef62-b2599905c0d0 panic message: assertion failed: plsz >= len, file: ../../common/vm/vm_pvn.c, line: 1118 dump content: kernel pages only > $c vpanic() 0xfffffffffbdf23c8() pvn_getpages+0x1f5(fffffffff79e9460, ffffff05b3738f00, 0, 1000, 0, 0) tmp_getpage+0x1a8(ffffff05b3738f00, 0, 1000, 0, 0, 0) fop_getpage+0x7e(ffffff05b3738f00, 0, 1000, 0, 0, 0) segvn_faulta+0x17c(ffffff053e44d780, 8050000) as_faulta+0x143(ffffff0b54055800, 8050000, 23f8) memcntl+0x53d(8050000, 23f8, 4, 3, 0, 0) sys_syscall32+0x1f7()
The 5th and 6th args to tmp_getpage are both 0s - IOW, pl NULL, plsz 0. This is valid.