On 07/15/2013 05:01 AM, Myklebust, Trond wrote: > On Sun, 2013-07-14 at 10:02 +0200, Toralf Förster wrote: >> This bisected commit produces at a 32 bit user mode linux guest the attached BUG : >> >> commit eeee245268c951262b861bc1be4e9dc812352499 >> Author: Trond Myklebust <Trond.Myklebust@xxxxxxxxxx> >> Date: Wed Jul 10 15:33:01 2013 -0400 >> >> SUNRPC: Fix a deadlock in rpc_client_register() >> >> Commit 384816051ca9125cd54750e59c780c2a2655fa4f (SUNRPC: fix races on >> PipeFS MOUNT notifications) introduces a regression when we call >> rpc_setup_pipedir() with RPCSEC_GSS as the auth flavour. >> >> By calling rpcauth_create() while holding the sn->pipefs_sb_lock, we >> end up deadlocking in gss_pipes_dentries_create_net(). >> Fix is to register the client and release the mutex before calling >> rpcauth_create(). >> >> Reported-by: Weston Andros Adamson <dros@xxxxxxxxxx> >> Tested-by: Weston Andros Adamson <dros@xxxxxxxxxx> >> Cc: Stanislav Kinsbursky <skinsbursky@xxxxxxxxxxxxx> >> Cc: <stable@xxxxxxxxxxxxxxx> # : 3848160: SUNRPC: fix races on PipeFS MOUNT >> Cc: <stable@xxxxxxxxxxxxxxx> # : e73f4cc: SUNRPC: split client creation >> Signed-off-by: Trond Myklebust <Trond.Myklebust@xxxxxxxxxx> >> >> >> >> >> >> >> 2013-07-13T22:09:07.000+02:00 trinity sm-notify[1042]: Version 1.2.6 starting >> 2013-07-13T22:09:07.000+02:00 trinity sm-notify[1042]: Backgrounding to notify hosts... >> 2013-07-13T22:09:07.000+02:00 trinity sm-notify[1043]: Running as root. chown /var/lib/nfs to choose different user >> 2013-07-13T22:09:10.000+02:00 trinity mount[1047]: mount to NFS server 'n22stab4' failed: No route to host, retrying >> 2013-07-13T22:09:11.000+02:00 trinity dhcpcd[971]: eth0: sending IPv6 Router Solicitation >> 2013-07-13T22:09:11.000+02:00 trinity dhcpcd[971]: eth0: no IPv6 Routers available >> 2013-07-13T22:09:13.000+02:00 trinity mount[1048]: mount to NFS server 'n22stab4' failed: No route to host, retrying >> 2013-07-13T22:09:13.647+02:00 trinity kernel: ============================================================================= >> 2013-07-13T22:09:13.647+02:00 trinity kernel: BUG kmalloc-256 (Not tainted): Poison overwritten >> 2013-07-13T22:09:13.647+02:00 trinity kernel: ----------------------------------------------------------------------------- <snip> >> 2013-07-13T22:09:13.647+02:00 trinity kernel: > Does the attached patch fix the problem? Yes. And it solves another related problem too : a soft lookup of CPU0 during shutdown of the UML guest :-) -- MfG/Sincerely Toralf Förster pgp finger print: 7B1A 07F4 EC82 0F90 D4C2 8936 872A E508 7DB6 9DA3 -- To unsubscribe from this list: send the line "unsubscribe linux-nfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
