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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