Changes to 27-JAN-2011: The day "/proc" died between r2 and r3
'''Solaris'd...'''
The setup:
Date: Thu, 27 Jan 2011 14:14:49
From: "UNIX Manager"
To: UNIX_SA_GROUP
Subject: Milky Way District UNIX Server
Someone take a look into whats going on with Milky Way District UNIX Server server
today. The server is up but is acting really strange, I was not able to get a
response from ps or ptree commands. Please note, there was not any server
consolidation work at this site last night.
--
A. Manager
Enterprise Unix & Storage Systems Manager
Spacely Sprockets, Inc.
--- --> ----
(blank line)
The Action:
workstation$ ssh milkyway1
milkyway1$ ps -eaf
# ls -ln /proc & echo $! --> ^C
^C
20023 --> ~.
# mdb -k
> 0t20023::pid2proc
workstation$ ssh milkyway1
302765d6078 --> milkyway1$ sudo su -
> 302765d6078::walk thread
300e3d5e100
milkyway1$ cd /proc
milkyway1$ echo *
0 1 10045 10116 10162 10163 10169 10176 10240 10243 10244 10246 10263 10318 10386
10483 10489...
milkyway1$ ls -ln
> 300e3d5e100::findstack -v --> ^C
stack pointer for thread 300e3d5e100: 2a10d548d71 --> ^C
(blank line)
~.
workstation$ ssh milkyway1
milkyway1$ sudo su -
milkyway1# ls -ln /proc & echo $!
20023
milkyway1# mdb -k
> 0t20023::pid2proc
[ 000002a10d548d71 cv_wait+0x38() ] --> 302765d6078
> 302765d6078::walk thread
300e3d5e100
> 300e3d5e100::findstack -v
stack pointer for thread 300e3d5e100: 2a10d548d71
[ 000002a10d548d71 cv_wait+0x38() ]
000002a10d548e21 pr_p_lock+0x80(0, 60032d48030, 60032d58600, 300b84af968, ff000000, 18f8218)
000002a10d548ed1 prgetattr+0x2d4(30025ce8240, 2a10d549998, 149, ffffffffffffffef, 300bd1a8da8, 0)
000002a10d548f91 fop_getattr+0x18(30025ce8240, 2a10d549998, 0, 3025fb17d00, 2a10d549ad8, 1362e00)
000002a10d549041 cstat64_32+0x1c(30025ce8240, ffbffb20, 0, 3025fb17d00, 3fff, 3c00)
000002a10d549221 cstatat64_32+0x5c(ffffffffffd19553, 26578, 1000, ffbffb20, 1000, 0)
000002a10d5492e1 syscall_trap32+0xcc(26578, ffbffb20, ffffffffffffffff, 27f68, 6c, 1b)
>
> 302765d6078 $p
debugger context set to proc 302765d6078
Segmentation Fault
milkyway1#
milkyway1# mdb -p 20023
mdb: failed to initialize /lib/libc_db.so.1: libthread_db call failed unexpectedly
mdb: warning: debugger will only be able to examine raw LWPs
Loading modules: [ ld.so.1 libc.so.1 libavl.so.1 ]
> 26578::print -i char*
0x26578 "/proc/26936"
# --> >
# mdb -p 20023
mdb: failed to initialize /lib/libc_db.so.1: libthread_db call failed unexpectedly
mdb: warning: debugger will only be able to examine raw LWPs
Loading modules: [ ld.so.1 libc.so.1 libavl.so.1 ]
> 26578::print -i char*
0x26578 "/proc/26936"
>
# echo '::ps -f' | mdb -k | grep 26936 --> milkyway1# echo '::ps -f' | mdb -k | grep 26936
S PID PPID PGID SID UID FLAGS ADDR NAME
R 26133 19481 26131 19469 0 0x4a004000 0000030276c7c4a0 grep 26936
R 26936 26935 26935 26935 1000 0x4a014000 00000300b84af968
# echo '::ps -fz' | mdb -k | grep 26936 --> milkyway1# echo '::ps -fz' | mdb -k | grep 26936
S PID PPID PGID SID ZONE UID FLAGS ADDR NAME
R 26936 26935 26935 26935 3 1000 0x4a014000 00000300b84af968
# mdb -k --> milkyway1# mdb -k
Loading modules: [ unix genunix specfs dtrace ufs sd mpt px md ldc ip hook neti sctp arp usba fcp fctl emlxs qlc lofs zfs ssd random crypto fcip logindmux ptm nfs ipc ] --> Loading modules: [ unix genunix specfs dtrace ufs sd mpt px md ldc ip hook neti sctp
arp usba fcp fctl emlxs qlc lofs zfs ssd random crypto fcip logindmux ptm nfs ipc ]
> 00000300b84af968::walk thread
3000f654d40
> 3000f654d40::findstack -v
stack pointer for thread 3000f654d40: 2a109f38a61
[ 000002a109f38a61 cv_wait+0x38() ]
000002a109f38b11 txg_wait_open+0x54(6003f983d20, 16533a, 0, 6003f983d64, 6003f983d66, 6003f983d18)
000002a109f38bc1 zfs_putapage+0x1e0(6004d6fae40, 5b, 2a109f39570, 2a109f39568, 400, 10a6ac0)
000002a109f38cb1 zfs_putpage+0x1b8(3002836dd40, b7c1a000, 0, 400, 30114c15318, 7000f9c9d80)
000002a109f38d81 fop_putpage+0x1c(3002836dd40, 0, b7c1a000, 400, 30114c15318, 7b262c7c)
000002a109f38e31 zfs_delmap+0x6c(3002836dd40, 0, 10a6800, 30114c15318, b7c1a000, b)
000002a109f38ef1 zfs_shim_delmap+0x3c(3002836dd40, 30114c15318, 1, 1, f, b)
000002a109f38fc1 fop_delmap+0x40(3002836dd40, 30114c15318, 1, f, b7c1a000, b)
000002a109f39091 segvn_unmap+0x180(3017e8a0bd0, fffffffec0000000, b7c1a000, b7c1a000, f, 600439d6b78)
000002a109f39181 as_unmap+0xe4(300ee744d20, 3017e8a0bd0, 300de51bd88, b7c1a000, 1, 1)
000002a109f39231 munmap+0x78(1fff, b7c1a000, 10a6800, 300b84af968, 300b84af968, fffffffec0000000)
000002a109f392e1 syscall_trap+0xac(fffffffec0000000, b7c1a000, 0, 8, 10012c4d0, 10012c460)
>
Only in r2
Only in r3 --> Modified slightly between r2 and r3