Running a latest Linus tree with nfsv4.2 and the blocklayout driver
against an XFS file system exported from the local machine I get
this error when running generic/089 somewhat relatively reproducibly
(doesn't happen on every run, but more often than not):
generic/089 133s ...[ 387.409504] run fstests generic/089 at 2016-09-20 16:31:44
[ 462.789037] general protection fault: 0000 [#1] SMP
[ 462.790231] Modules linked in:
[ 462.790557] CPU: 2 PID: 3087 Comm: nfsd Tainted: G W 4.8.0-rc6+ #1939
[ 462.791235] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.7.5-20140531_083030-gandalf 04/01/2014
[ 462.792145] task: ffff880137fa1280 task.stack: ffff880137fa4000
[ 462.792163] RIP: 0010:[<ffffffff813fff4a>] [<ffffffff813fff4a>] release_lock_stateid+0x1a/0x60
[ 462.792163] RSP: 0018:ffff880137fa7cd8 EFLAGS: 00010246
[ 462.792163] RAX: ffff880137d90548 RBX: ffff88013a7c7a88 RCX: ffff880137fa1a48
[ 462.792163] RDX: ffff880137fa1a48 RSI: 0000000000000000 RDI: ffff88013a7c7a88
[ 462.792163] RBP: ffff880137fa7cf0 R08: 0000000000000001 R09: 0000000000000000
[ 462.792163] R10: 0000000000000001 R11: 0000000000000000 R12: 6b6b6b6b6b6b6b6b
[ 462.792163] R13: 0000000000000000 R14: ffff88013ac08000 R15: 0000000000000021
[ 462.792163] FS: 0000000000000000(0000) GS:ffff88013fd00000(0000) knlGS:0000000000000000
[ 462.792163] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 462.792163] CR2: 00007fcf2d818000 CR3: 0000000135b0e000 CR4: 00000000000006e0
[ 462.792163] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 462.792163] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[ 462.792163] Stack:
[ 462.792163] ffff88013a7c7a88 ffff88013a7c7b40 0000000000000000 ffff880137fa7d18
[ 462.792163] ffffffff81405b5a ffff880138ffd000 ffff880136dce000 ffff880138ffd068
[ 462.792163] ffff880137fa7d70 ffffffff813f13f4 ffff88013ac08220 0000000000000870
[ 462.792163] Call Trace:
[ 462.792163] [<ffffffff81405b5a>] nfsd4_free_stateid+0x16a/0x170
[ 462.792163] [<ffffffff813f13f4>] nfsd4_proc_compound+0x344/0x630
[ 462.792163] [<ffffffff813dc573>] nfsd_dispatch+0xb3/0x1f0
[ 462.792163] [<ffffffff81dc0898>] svc_process_common+0x428/0x650
[ 462.792163] [<ffffffff81dc0c15>] svc_process+0x155/0x340
[ 462.792163] [<ffffffff813dbaf2>] nfsd+0x172/0x270
[ 462.792163] [<ffffffff813db980>] ? nfsd_destroy+0x180/0x180
[ 462.792163] [<ffffffff813db980>] ? nfsd_destroy+0x180/0x180
[ 462.792163] [<ffffffff810fab91>] kthread+0xf1/0x110
[ 462.792163] [<ffffffff81e01e6f>] ret_from_fork+0x1f/0x40
[ 462.792163] [<ffffffff810faaa0>] ? kthread_create_on_node+0x200/0x200
(gdb) l *(release_lock_stateid+0x1a)
0xffffffff813fff4a is in release_lock_stateid
(./include/linux/spinlock.h:302).
297 raw_spin_lock_init(&(_lock)->rlock); \
298 } while (0)
299
300 static __always_inline void spin_lock(spinlock_t *lock)
301 {
302 raw_spin_lock(&lock->rlock);
303 }
304
305 static __always_inline void spin_lock_bh(spinlock_t *lock)
306 {
(gdb) l *(nfsd4_free_stateid+0x16a)
0xffffffff81405b5a is in nfsd4_free_stateid (fs/nfsd/nfs4state.c:4923).
4918 ret = nfserr_locks_held;
4919 if (check_for_locks(stp->st_stid.sc_file,
4920 lockowner(stp->st_stateowner)))
4921 goto out;
4922
4923 release_lock_stateid(stp);
4924 ret = nfs_ok;
4925
4926 out:
4927 mutex_unlock(&stp->st_mutex);
(gdb)
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