This seems to introduce a fairly easily reproducible oops, which I can
reproduce when running xfstests against a Linux NFSv4.1 server:
generic/089 242s ...[ 2187.041239] general protection fault: 0000 [#1]
SMP
[ 2187.042899] Modules linked in:
[ 2187.044000] CPU: 0 PID: 11913 Comm: kworker/0:1 Not tainted 3.16.0-rc6+ #1151
[ 2187.044287] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2007
[ 2187.044287] Workqueue: nfsiod free_lock_state_work
[ 2187.044287] task: ffff880072b50cd0 ti: ffff88007a4ec000 task.ti: ffff88007a4ec000
[ 2187.044287] RIP: 0010:[<ffffffff81361ca6>] [<ffffffff81361ca6>] free_lock_state_work+0x16/0x30
[ 2187.044287] RSP: 0018:ffff88007a4efd58 EFLAGS: 00010296
[ 2187.044287] RAX: 6b6b6b6b6b6b6b6b RBX: ffff88007a947ac0 RCX: 8000000000000000
[ 2187.044287] RDX: ffffffff826af9e0 RSI: ffff88007b093c00 RDI: ffff88007b093db8
[ 2187.044287] RBP: ffff88007a4efd58 R08: ffffffff832d3e10 R09: 000001c40efc0000
[ 2187.044287] R10: 0000000000000000 R11: 0000000000059e30 R12: ffff88007fc13240
[ 2187.044287] R13: ffff88007fc18b00 R14: ffff88007b093db8 R15: 0000000000000000
[ 2187.044287] FS: 0000000000000000(0000) GS:ffff88007fc00000(0000) knlGS:0000000000000000
[ 2187.044287] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b
[ 2187.044287] CR2: 00007f93ec33fb80 CR3: 0000000079dc2000 CR4: 00000000000006f0
[ 2187.044287] Stack:
[ 2187.044287] ffff88007a4efdd8 ffffffff810cc877 ffffffff810cc80d ffff88007fc13258
[ 2187.044287] 000000007a947af0 0000000000000000 ffffffff8353ccc8 ffffffff82b6f3d0
[ 2187.044287] 0000000000000000 ffffffff82267679 ffff88007a4efdd8 ffff88007fc13240
[ 2187.044287] Call Trace:
[ 2187.044287] [<ffffffff810cc877>] process_one_work+0x1c7/0x490
[ 2187.044287] [<ffffffff810cc80d>] ? process_one_work+0x15d/0x490
[ 2187.044287] [<ffffffff810cd569>] worker_thread+0x119/0x4f0
[ 2187.044287] [<ffffffff810fbbad>] ? trace_hardirqs_on+0xd/0x10
[ 2187.044287] [<ffffffff810cd450>] ? init_pwq+0x190/0x190
[ 2187.044287] [<ffffffff810d3c6f>] kthread+0xdf/0x100
[ 2187.044287] [<ffffffff810d3b90>] ? __init_kthread_worker+0x70/0x70
[ 2187.044287] [<ffffffff81d9873c>] ret_from_fork+0x7c/0xb0
[ 2187.044287] [<ffffffff810d3b90>] ? __init_kthread_worker+0x70/0x70
[ 2187.044287] Code: 0f 1f 44 00 00 31 c0 5d c3 66 66 66 2e 0f 1f 84 00 00 00 00 00 55 48 8d b7 48 fe ff ff 48 8b 87 58 fe ff ff 48 89 e5 48 8b 40 30 <48> 8b 00 48 8b 10 48 89 c7 48 8b 92 90 03 00 00 ff 52 28 5d c3
[ 2187.044287] RIP [<ffffffff81361ca6>] free_lock_state_work+0x16/0x30
[ 2187.044287] RSP <ffff88007a4efd58>
[ 2187.103626] ---[ end trace 0f11326d28e5d8fa ]---
seems like this happens when trying to derefence the state owner in
the work queue:
(gdb) l *(free_lock_state_work+0x16)
0xffffffff81361ca6 is in free_lock_state_work (fs/nfs/nfs4state.c:808).
803 free_lock_state_work(struct work_struct *work)
804 {
805 struct nfs4_lock_state *lsp = container_of(work,
806 struct nfs4_lock_state,
ls_release);
807 struct nfs4_state *state = lsp->ls_state;
808 struct nfs_server *server = state->owner->so_server;
809 struct nfs_client *clp = server->nfs_client;
810
811 clp->cl_mvops->free_lock_state(server, lsp);
812 }
--
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
