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Date:	Mon, 20 Feb 2012 20:27:26 -0500
From:	Alex VillacĂ­s Lasso <a_villacis@...osanto.com>
To:	linux-kernel@...r.kernel.org
Subject: Deadlock warning in 3.3-rc4 in zcache code when running transmission-gtk

I am getting (potential?) deadlock warnings in zcache code shortly after 
running transmission-gtk, the bittorrent client. My / partition is ext4, 
and /home and /DATA (where some torrents are stored) are ext3 mounted 
with ext4 subsystem. The warning has triggered twice so far, always 
after running transmission-gtk.

BTW, who maintains zcache now?

Fedora 16 x86_64, vanilla linux 3.3-rc4.
Deadlock warning did not appear in 3.3-rc3.

[alex@...lalex linux-git]$ cat /proc/mounts
rootfs / rootfs rw 0 0
proc /proc proc rw,nosuid,nodev,noexec,relatime 0 0
sysfs /sys sysfs rw,seclabel,nosuid,nodev,noexec,relatime 0 0
devtmpfs /dev devtmpfs 
rw,seclabel,nosuid,relatime,size=1011036k,nr_inodes=252759,mode=755 0 0
devpts /dev/pts devpts 
rw,seclabel,nosuid,noexec,relatime,gid=5,mode=620,ptmxmode=000 0 0
tmpfs /dev/shm tmpfs rw,seclabel,nosuid,nodev,relatime 0 0
/dev/sdb2 / ext4 
rw,seclabel,relatime,user_xattr,acl,barrier=1,data=ordered 0 0
tmpfs /run tmpfs rw,seclabel,nosuid,nodev,relatime,mode=755 0 0
selinuxfs /sys/fs/selinux selinuxfs rw,relatime 0 0
tmpfs /sys/fs/cgroup tmpfs 
rw,seclabel,nosuid,nodev,noexec,relatime,mode=755 0 0
cgroup /sys/fs/cgroup/systemd cgroup 
rw,nosuid,nodev,noexec,relatime,release_agent=/lib/systemd/systemd-cgroups-agent,name=systemd 
0 0
cgroup /sys/fs/cgroup/cpuset cgroup 
rw,nosuid,nodev,noexec,relatime,cpuset 0 0
cgroup /sys/fs/cgroup/cpu,cpuacct cgroup 
rw,nosuid,nodev,noexec,relatime,cpuacct,cpu 0 0
cgroup /sys/fs/cgroup/memory cgroup 
rw,nosuid,nodev,noexec,relatime,memory 0 0
cgroup /sys/fs/cgroup/devices cgroup 
rw,nosuid,nodev,noexec,relatime,devices 0 0
cgroup /sys/fs/cgroup/freezer cgroup 
rw,nosuid,nodev,noexec,relatime,freezer 0 0
cgroup /sys/fs/cgroup/net_cls cgroup 
rw,nosuid,nodev,noexec,relatime,net_cls 0 0
cgroup /sys/fs/cgroup/blkio cgroup rw,nosuid,nodev,noexec,relatime,blkio 0 0
cgroup /sys/fs/cgroup/perf_event cgroup 
rw,nosuid,nodev,noexec,relatime,perf_event 0 0
systemd-1 /proc/sys/fs/binfmt_misc autofs 
rw,relatime,fd=25,pgrp=1,timeout=300,minproto=5,maxproto=5,direct 0 0
tmpfs /media tmpfs 
rw,rootcontext=system_u:object_r:mnt_t:s0,seclabel,nosuid,nodev,noexec,relatime,mode=755 
0 0
debugfs /sys/kernel/debug debugfs rw,relatime 0 0
mqueue /dev/mqueue mqueue rw,seclabel,relatime 0 0
securityfs /sys/kernel/security securityfs rw,relatime 0 0
hugetlbfs /dev/hugepages hugetlbfs rw,seclabel,relatime 0 0
sunrpc /var/lib/nfs/rpc_pipefs rpc_pipefs rw,relatime 0 0
configfs /sys/kernel/config configfs rw,relatime 0 0
binfmt_misc /proc/sys/fs/binfmt_misc binfmt_misc rw,relatime 0 0
/dev/sda1 /DATA ext3 
rw,seclabel,relatime,user_xattr,acl,barrier=1,nodelalloc,data=ordered 0 0
/dev/sdb5 /home ext3 
rw,seclabel,relatime,user_xattr,barrier=1,nodelalloc,data=ordered 0 0
/dev/sdb1 /boot ext4 
rw,seclabel,relatime,user_xattr,acl,barrier=1,data=ordered 0 0
fusectl /sys/fs/fuse/connections fusectl rw,relatime 0 0
gvfs-fuse-daemon /home/alex/.gvfs fuse.gvfs-fuse-daemon 
rw,nosuid,nodev,relatime,user_id=1000,group_id=1000 0 0

[alex@...lalex linux-git]$ lsmod
Module                  Size  Used by
fuse                   77739  3
lockd                  84799  0
ip6t_REJECT            12939  2
nf_conntrack_ipv4      14622  2
nf_defrag_ipv4         12673  1 nf_conntrack_ipv4
nf_conntrack_ipv6      14290  2
nf_defrag_ipv6         18139  1 nf_conntrack_ipv6
xt_state               12578  4
nf_conntrack           81501  3 nf_conntrack_ipv4,nf_conntrack_ipv6,xt_state
ip6table_filter        12815  1
ip6_tables             26976  1 ip6table_filter
ppdev                  17635  0
microcode              23348  0
pcspkr                 12718  0
i2c_i801               17765  0
iTCO_wdt               17984  0
iTCO_vendor_support    13419  1 iTCO_wdt
snd_hda_codec_realtek   145270  1
r8169                  60933  0
parport_pc             28082  0
parport                44745  2 ppdev,parport_pc
mii                    13527  1 r8169
snd_hda_intel          33348  2
snd_hda_codec         120114  2 snd_hda_codec_realtek,snd_hda_intel
snd_hwdep              17611  1 snd_hda_codec
snd_seq                65095  0
snd_seq_device         14129  1 snd_seq
snd_pcm                97122  2 snd_hda_intel,snd_hda_codec
binfmt_misc            17431  1
snd_timer              28923  2 snd_seq,snd_pcm
snd                    83076  12 
snd_hda_codec_realtek,snd_hda_intel,snd_hda_codec,snd_hwdep,snd_seq,snd_seq_device,snd_pcm,snd_timer
soundcore              14484  1 snd
snd_page_alloc         18101  2 snd_hda_intel,snd_pcm
uinput                 17642  0
sunrpc                249411  2 lockd
floppy                 73658  0
i915                  471867  3
drm_kms_helper         40371  1 i915
drm                   242326  4 i915,drm_kms_helper
i2c_algo_bit           13156  1 i915
i2c_core               37991  5 
i2c_i801,i915,drm_kms_helper,drm,i2c_algo_bit
video                  18932  1 i915


View attachment "dmesg-zcache-deadlock-2012-02-20.txt" of type "text/plain" (66161 bytes)

View attachment ".config" of type "text/plain" (115727 bytes)

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