Hi,
I got below hangup with current Linus' tree.
[ 166.378906] ------------[ cut here ]------------
[ 166.385742] WARNING: CPU: 0 PID: 0 at kernel/rcu/update.c:107
__rcu_read_unlock+0x70/0x84()
[ 166.394531] CPU: 0 PID: 0 Comm: Not tainted 3.13.0-rc4-00291-g002c96b-dirty
#2135
[ 166.404296] [<0000c4f0>] (unwind_backtrace+0x0/0xe0) from [<0000ae98>]
(show_stack+0x10/0x14)
[ 166.415039] [<0000ae98>] (show_stack+0x10/0x14) from [<0000f924>]
(warn_slowpath_common+0x58/0x78)
[ 166.425781] [<0000f924>] (warn_slowpath_common+0x58/0x78) from [<0000f9e8>]
(warn_slowpath_null+0x18/0x1c)
[ 166.437499] [<0000f9e8>] (warn_slowpath_null+0x18/0x1c) from [<00041004>]
(__rcu_read_unlock+0x70/0x84)
[ 166.449218] [<00041004>] (__rcu_read_unlock+0x70/0x84) from [<000185a4>]
(__sigqueue_alloc+0x98/0x180)
[ 166.459960] [<000185a4>] (__sigqueue_alloc+0x98/0x180) from [<00000000>] (
(null))
[ 166.467773] ---[ end trace 97ba89e778f73a83 ]---
[ 166.475585]
[ 166.477539] =====================================
[ 166.482421] [ BUG: bad unlock balance detected! ]
[ 166.487304] 3.13.0-rc4-00291-g002c96b-dirty #2135 Tainted: G W
[ 166.495117] -------------------------------------
[ 166.499999] kworker/0:0/4 is trying to release lock (rcu_read_lock) at:
[ 166.507812] [<0001850c>] __sigqueue_alloc+0x0/0x180
[ 166.512695] but there are no more locks to release!
[ 166.518554]
[ 166.518554] other info that might help us debug this:
[ 166.525390] 2 locks held by kworker/0:0/4:
[ 166.530273] #0: (%s%d){.+.+.+}, at: [<00020df4>]
process_one_work+0x1f0/0x420
[ 166.539062] #1: ((&new->work)){+.+.+.}, at: [<00020df4>]
process_one_work+0x1f0/0x420
[ 166.547851]
[ 166.547851] stack backtrace:
[ 166.553710] CPU: 0 PID: 4 Comm: kworker/0:0 Tainted: G W
3.13.0-rc4-00291-g002c96b-dirty #2135
[ 166.564453] Workqueue: mtdblock1 mtd_blktrans_work
[ 166.571289] [<0000c4f0>] (unwind_backtrace+0x0/0xe0) from [<0000ae98>]
(show_stack+0x10/0x14)
[ 166.582031] [<0000ae98>] (show_stack+0x10/0x14) from [<0003224c>]
(print_unlock_imbalance_bug+0xa4/0xd8)
[ 166.593749] [<0003224c>] (print_unlock_imbalance_bug+0xa4/0xd8) from
[<00036fc4>] (lock_release+0x1ac/0x200)
[ 166.605468] [<00036fc4>] (lock_release+0x1ac/0x200) from [<000185a0>]
(__sigqueue_alloc+0x94/0x180)
[ 166.616210] [<000185a0>] (__sigqueue_alloc+0x94/0x180) from [<01e16940>]
(0x1e16940)
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