9.2 + ZFS + i386 = panic: pmap_enter: attempted pmap_enter on 4MB page

[Konstantin Belousov]

On Tue, Oct 15, 2013 at 09:23:58PM -0400, J David wrote:
> With a kernel updated with debugging code and r253949, it panics during boot:
> 
> fifo_open: 0x894212d0 is not exclusive locked but should be
> KDB: enter: lock violation
> -[ thread pid 963 tid 100353 ]
> Stopped at      kdb_enter+0x3d: movl    $0,kdb_why
> db> where
> Tracing pid 963 tid 100353 td 0x883aa5e0
> kdb_enter(8112e312,8112e4ee,894212d0,8112e24d,812746d4,...) at
> kdb_enter+0x3d/frame 0xbf656980
> assert_vop_elocked(894212d0,811069b9,df,1,0,...) at
> assert_vop_elocked+0xbe/frame 0xbf6569b0
> fifo_open(bf656ae8,8117a85a,8114f47a,81423bac,bf656a74,...) at
> fifo_open+0x36/frame 0xbf656a10
> VOP_OPEN_APV(818a3f30,bf656ae8,100,10000,10000,...) at
> VOP_OPEN_APV+0xca/frame 0xbf656a40
> vn_open_cred(bf656b60,bf656bec,c08,0,879ae180,8832d428) at
> vn_open_cred+0x5a5/frame 0xbf656b18
> vn_open(bf656b60,bf656bec,c08,8832d428,0,...) at vn_open+0x3b/frame 0xbf656b38
> kern_openat(883aa5e0,ffffff9c,804a7b2,0,4,7fbfde08) at
> kern_openat+0x1cb/frame 0xbf656c20
> sys_open(883aa5e0,bf656cc8,811748f4,81126582,1,...) at
> sys_open+0x38/frame 0xbf656c40
> syscall(bf656d08) at syscall+0x2da/frame 0xbf656cfc
> Xint0x80_syscall() at Xint0x80_syscall+0x21/frame 0xbf656cfc
> --- syscall (5, FreeBSD ELF32, sys_open), eip = 0x2815e29b, esp =
> 0x7fbfdd6c, ebp = 0x7fbfdd78 ---
> 
> If possible, I'll see about booting it in single user mode and
> disabling as much junk as possible that might be touching FIFO's, as
> it's unlike that problem is related to the ZFS issue.

You want r255728.
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