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J. Bruce Fields a0f6ed8ebe RPCSEC_GSS: fix crash on destroying gss auth ... This fixes a regression since eb6dc19d8e "RPCSEC_GSS: Share all credential caches on a per-transport basis" which could cause an occasional oops in the nfsd code (see below). The problem was that an auth was left referencing a client that had been freed. To avoid this we need to ensure that auths are shared only between descendants of a common client; the fact that a clone of an rpc_client takes a reference on its parent then ensures that the parent client will last as long as the auth. Also add a comment explaining what I think was the intention of this code. general protection fault: 0000 [#1] PREEMPT SMP Modules linked in: rpcsec_gss_krb5 nfsd auth_rpcgss oid_registry nfs_acl lockd sunrpc CPU: 3 PID: 4071 Comm: kworker/u8:2 Not tainted 3.11.0-rc2-00182-g025145f #1665 Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 Workqueue: nfsd4_callbacks nfsd4_do_callback_rpc [nfsd] task: ffff88003e206080 ti: ffff88003c384000 task.ti: ffff88003c384000 RIP: 0010:[<ffffffffa00001f3>] [<ffffffffa00001f3>] rpc_net_ns+0x53/0x70 [sunrpc] RSP: 0000:ffff88003c385ab8 EFLAGS: 00010246 RAX: 6b6b6b6b6b6b6b6b RBX: ffff88003af9a800 RCX: 0000000000000002 RDX: ffffffffa00001a5 RSI: 0000000000000001 RDI: ffffffff81e284e0 RBP: ffff88003c385ad8 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000015 R12: ffff88003c990840 R13: ffff88003c990878 R14: ffff88003c385ba8 R15: ffff88003e206080 FS: 0000000000000000(0000) GS:ffff88003fd80000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b CR2: 00007fcdf737e000 CR3: 000000003ad2b000 CR4: 00000000000006e0 Stack: ffffffffa00001a5 0000000000000006 0000000000000006 ffff88003af9a800 ffff88003c385b08 ffffffffa00d52a4 ffff88003c385ba8 ffff88003c751bd8 ffff88003c751bc0 ffff88003e113600 ffff88003c385b18 ffffffffa00d530c Call Trace: [<ffffffffa00001a5>] ? rpc_net_ns+0x5/0x70 [sunrpc] [<ffffffffa00d52a4>] __gss_pipe_release+0x54/0x90 [auth_rpcgss] [<ffffffffa00d530c>] gss_pipe_free+0x2c/0x30 [auth_rpcgss] [<ffffffffa00d678b>] gss_destroy+0x9b/0xf0 [auth_rpcgss] [<ffffffffa000de63>] rpcauth_release+0x23/0x30 [sunrpc] [<ffffffffa0001e81>] rpc_release_client+0x51/0xb0 [sunrpc] [<ffffffffa00020d5>] rpc_shutdown_client+0xe5/0x170 [sunrpc] [<ffffffff81098a14>] ? cpuacct_charge+0xa4/0xb0 [<ffffffff81098975>] ? cpuacct_charge+0x5/0xb0 [<ffffffffa019556f>] nfsd4_process_cb_update.isra.17+0x2f/0x210 [nfsd] [<ffffffff819a4ac0>] ? _raw_spin_unlock_irq+0x30/0x60 [<ffffffff819a4acb>] ? _raw_spin_unlock_irq+0x3b/0x60 [<ffffffff810703ab>] ? process_one_work+0x15b/0x510 [<ffffffffa01957dd>] nfsd4_do_callback_rpc+0x8d/0xa0 [nfsd] [<ffffffff8107041e>] process_one_work+0x1ce/0x510 [<ffffffff810703ab>] ? process_one_work+0x15b/0x510 [<ffffffff810712ab>] worker_thread+0x11b/0x370 [<ffffffff81071190>] ? manage_workers.isra.24+0x2b0/0x2b0 [<ffffffff8107854b>] kthread+0xdb/0xe0 [<ffffffff819a4ac0>] ? _raw_spin_unlock_irq+0x30/0x60 [<ffffffff81078470>] ? __init_kthread_worker+0x70/0x70 [<ffffffff819ac7dc>] ret_from_fork+0x7c/0xb0 [<ffffffff81078470>] ? __init_kthread_worker+0x70/0x70 Code: a5 01 00 a0 31 d2 31 f6 48 c7 c7 e0 84 e2 81 e8 f4 91 0a e1 48 8b 43 60 48 c7 c2 a5 01 00 a0 be 01 00 00 00 48 c7 c7 e0 84 e2 81 <48> 8b 98 10 07 00 00 e8 91 8f 0a e1 e8 +3c 4e 07 e1 48 83 c4 18 RIP [<ffffffffa00001f3>] rpc_net_ns+0x53/0x70 [sunrpc] RSP <ffff88003c385ab8> Signed-off-by: J. Bruce Fields <bfields@redhat.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>		12 years ago
..
auth_gss	RPCSEC_GSS: fix crash on destroying gss auth	12 years ago
xprtrdma	Merge branch 'for-3.11' of git://linux-nfs.org/~bfields/linux	12 years ago
Kconfig	Merge branch 'rpcsec_gss-from_cel' into linux-next	12 years ago
Makefile	…
addr.c	sunrpc: move address copy/cmp/convert routines and prototypes from clnt.h to addr.h	12 years ago
auth.c	shrinker: convert remaining shrinkers to count/scan API	12 years ago
auth_generic.c	sunrpc: Add missing kuids conversion for printing	12 years ago
auth_null.c	SUNRPC refactor rpcauth_checkverf error returns	12 years ago
auth_unix.c	SUNRPC refactor rpcauth_checkverf error returns	12 years ago
backchannel_rqst.c	SUNRPC: remove two BUG_ON asserts	12 years ago
bc_svc.c	SUNRPC: remove BUG_ON from bc_send	12 years ago
cache.c	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	12 years ago
clnt.c	NFS client updates for Linux 3.12	12 years ago
netns.h	SUNRPC: If the rpcbind channel is disconnected, fail the call to unregister	12 years ago
rpc_pipe.c	SUNRPC: Add a helper to allow sharing of rpc_pipefs directory objects	12 years ago
rpcb_clnt.c	SUNRPC: If the rpcbind channel is disconnected, fail the call to unregister	12 years ago
sched.c	SUNRPC: Ensure rpc_task->tk_pid is available for tracepoints	12 years ago
socklib.c	…
stats.c	SUNRPC: Deprecate rpc_client->cl_protname	12 years ago
sunrpc.h	…
sunrpc_syms.c	SUNRPC: register PipeFS file system after pernet sybsystem	13 years ago
svc.c	drivers: avoid parsing names as kthread_run() format strings	12 years ago
svc_xprt.c	svcrpc: fix rpc server shutdown races	12 years ago
svcauth.c	hlist: drop the node parameter from iterators	12 years ago
svcauth_unix.c	svcrpc: fix failures to handle -1 uid's	12 years ago
svcsock.c	Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net	12 years ago
sysctl.c	net: Convert uses of typedef ctl_table to struct ctl_table	12 years ago
timer.c	net: cleanup unsigned to unsigned int	13 years ago
xdr.c	SUNRPC: Fix memory corruption issue on 32-bit highmem systems	12 years ago
xprt.c	SUNRPC: allow disabling idle timeout	12 years ago
xprtsock.c	NFS client updates for Linux 3.12	12 years ago