Re: kern/54311: panic: kernel diagnostic assertion "!"kernel path too long in pathbuf_create"" failed

[Thomas Klausner <wiz%NetBSD.org@localhost>]

The following reply was made to PR kern/54311; it has been noted by GNATS.

From: Thomas Klausner <wiz%NetBSD.org@localhost>
To: gnats-bugs%netbsd.org@localhost
Cc: Kamil Rytarowski <n54%gmx.com@localhost>
Subject: Re: kern/54311: panic: kernel diagnostic assertion "!"kernel path
 too long in pathbuf_create"" failed
Date: Wed, 19 Jun 2019 22:05:39 +0200

 On Wed, Jun 19, 2019 at 06:35:00PM +0000, Andreas Gustafsson wrote:
 > lib/libc/sys/t_mknod (290/801): 4 test cases
 >     mknod_err: [ 7935.4265244] panic: kernel diagnostic assertion "!"kernel path too long in pathbuf_create"" failed: file "/tmp/bracket/build/2019.06.18.23.53.55-i386/src/sys/kern/vfs_lookup.c", line 308
 > [ 7935.4265244] cpu0: Begin traceback...
 > [ 7935.4265244] vpanic(c10a7000,c9906dec,c9906e00,c09c2b66,c10a7000,c10a6f3f,c1175994,c117566c,134,c9906e3c) at netbsd:vpanic+0x12d
 > [ 7935.4465199] kern_assert(c10a7000,c10a6f3f,c1175994,c117566c,134,c9906e3c,c9906e10,c09c2bf4,bfb4f993,c23f30a0) at netbsd:kern_assert+0x23
 > [ 7935.4465199] pathbuf_create(bfb4f993,c23f30a0,c9906f14,c09d0a46,bfb4f993,1,c9906e3c,0,0,0) at netbsd:pathbuf_create+0x63
 > [ 7935.4465199] pathbuf_maybe_copyin(bfb4f993,1,c9906e3c,0,0,0,16,c1baf000,c23d6270,c1a65e08) at netbsd:pathbuf_maybe_copyin+0x1c
 > [ 7935.4665218] do_sys_mknodat(c23f30a0,ffffff9c,bfb4f993,2000,0,0,1,c9906f9c,c01589c1,c23f30a0) at netbsd:do_sys_mknodat+0x86
 > [ 7935.4665218] sys___mknod50(c23f30a0,c9906f68,c9906f60,c1b899e0,ffffffff,c9906f60,1c2,c9906f68,0,0) at netbsd:sys___mknod50+0x3f
 > [ 7935.4865231] syscall() at netbsd:syscall+0x151
 > [ 7935.4865231] --- syscall (number 450) ---
 > [ 7935.4865231] b8243357:
 > [ 7935.4865231] cpu0: End traceback...
 
 I see something similar on amd64 just booting -current from nvme0 (handcopied):
 
 kern.module.path=/stand/amd64/8.99.46/modules
 panic: prevented access to 0x7f7fffbe6d69 (SMAP)
 cpu0: Begin traceback...
 vapnic() at netbsd:vpanic
 snprintf() at netbsd:snprintf
 trap() at netbsd:trap
 --- trap (number 6) --
 copystr() at netbsd:copystr+0xe
 pathbuf_maybe_copyin() at netbsd:pathbuf_maybe_copyin+0x13
 do_sys_mknodat() at netbsd:do_sys_mknodat+0x18d
 syscall() at netbsd:syscall+0x348
 --- syscall (number 450) ---
 7e52c8c8f32a:
 cpu0: End traceback...
 fatal breakpoint trap in supervisor mode
 trap type 1 code 0 rip 0xffffffff8021ccfd cs 0x8 rflags 0x286 cr2 0x7f7ffffbe6e69 ilevel 0 rsp 0xffff94965d2b3850
 curlwp ...
 Stopped in pid 26.1 (mknod) at netbsd:breakpoint+0x5: leave
 
  Thomas