Re: kern/50664: "cd .." over NFS/ZFS can panic kernel

[Brian Marcotte <marcotte%panix.com@localhost>]

The following reply was made to PR kern/50664; it has been noted by GNATS.

From: Brian Marcotte <marcotte%panix.com@localhost>
To: "J. Hannken-Illjes" <hannken%eis.cs.tu-bs.de@localhost>
Cc: kern-bug-people%netbsd.org@localhost, gnats-admin%netbsd.org@localhost,
	netbsd-bugs%netbsd.org@localhost, gnats-bugs%NetBSD.org@localhost
Subject: Re: kern/50664: "cd .." over NFS/ZFS can panic kernel
Date: Sun, 17 Jan 2016 15:24:10 -0500

 >  Could you add a panic() after the printf so we get the backtrace when =
 >  things go wrong:
 
 enter 0xc1b397a0 0xc1b397a0 ".."
 panic: bad parent
 cpu0: Begin traceback...
 panic(c03ef205,c0405d48,2,2,c0d59400,c1b397a0,0,cab32930,c0d3f924,0) at netbsd:panic+0x18
 nfs_cache_enter(cab32a28,cab32a34,cab32a40,0,0,cab32a38,cab32a34,cab32a40,0,0) at netbsd:nfs_cache_enter+0xe4
 nfs_lookup(cab32a74,c1b397a0,cab32c0c,cab32c0c,cab32a8c,c03841f2,c03d27c8,c1b397a0,cab32ac4,cab32c0c) at netbsd:nfs_lookup+0x6ae
 VOP_LOOKUP(c1b397a0,cab32ac4,cab32c0c,2,c1b397a0,cab32ad4,c0bf56d0,cab32bb4,cab32be8,c0be62a0) at netbsd:VOP_LOOKUP+0xa8
 lookup_once(cab32b74,cab32b70,4,c040fb80,cab32b0c,c02c8d9b,8,0,cab32be8,cab32b0c) at netbsd:lookup_once+0x19f
 namei_tryemulroot(0,c0b1bb40,1,0,c04159cc,cab32be8,cab32c0c,20,0,0) at netbsd:namei_tryemulroot+0x212
 namei(cab32be8,cab32c28,0,c0b77568,c0d59400,c0d51dc0,0,c1b397a0,0,1) at netbsd:namei+0x29
 do_sys_stat(bb50a3f4,0,cab32c40,b01,0,416d,7,0,2,0) at netbsd:do_sys_stat+0x49
 sys___lstat50(c0be62a0,cab32d00,cab32d28,0,c0bfaaf8,1b9,0,bb50f000,cab32d00,c0bf56d0) at netbsd:sys___lstat50+0x2e
 syscall(cab32d48,b3,ab,bf7f001f,806001f,bb50a3a0,bb50a3f8,bf7fed38,bb7b15bc,bb50a3a0) at netbsd:syscall+0xaa
 cpu0: End traceback...
 
 --
 - Brian