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[ 16.171642] [ INFO: suspicious RCU usage. ]
[ 16.171756] 4.4.18-grsec #1 Not tainted
[ 16.171869] -------------------------------
[ 16.171981] kernel/include/linux/rcupdate.h:560 Illegal context switch in RCU read-side critical section!
[ 16.172228]
[ 16.172228] other info that might help us debug this:
[ 16.172228]
[ 16.172413]
[ 16.172413] rcu_scheduler_active = 1, debug_locks = 0
[ 16.172563] 4 locks held by mount/214:
[ 16.172674] #0: (rcu_read_lock){......}, at: [<gr_log_varargs at grsec_log.c:142>] ffffffff813e3920
[ 16.173214] #1: (tasklist_lock){.+.+..}, at: [<gr_log_varargs at grsec_log.c:157 (discriminator 4)>] ffffffff813e39c2
[ 16.173700] #2: (grsec_exec_file_lock){++++..}, at: [<gr_log_varargs at grsec_log.c:157 (discriminator 4)>] ffffffff813e39ce
[ 16.174189] #3: (grsec_audit_lock){+.+...}, at: [<gr_log_varargs at grsec_log.c:52>] ffffffff813e39e3
[ 16.174723]
[ 16.174723] stack backtrace:
[ 16.174867] CPU: 0 PID: 214 Comm: mount Not tainted 4.4.18-grsec #1
[ 16.174991] Hardware name: Intel Corporation S2600GZ/S2600GZ, BIOS SE5C600.86B.02.03.0003.041920141333 04/19/2014
[ 16.175158] 0000000000000000 ffffc90006923b08 ffffffff813ecbd8 0000000000000011
[ 16.175579] ffff88048b940000 0000000000000001 ffffc90006923b38 ffffffff810d53d7
[ 16.175998] 0000000000000000 ffffffff81af21e0 00000000000002f5 0000000000001000
[ 16.176483] Call Trace:
[ 16.176599] [<dump_stack at dump_stack.c:53>] dump_stack+0x9a/0xe2
[ 16.176720] [<lockdep_rcu_suspicious at lockdep.c:4303>] lockdep_rcu_suspicious+0xd7/0x110
[ 16.176846] [<___might_sleep at rcupdate.h:559>] ___might_sleep+0xa2/0x220
[ 16.176966] [<__might_sleep at core.c:7578 (discriminator 14)>] __might_sleep+0x44/0x80
[ 16.177088] [<dput at dcache.c:757>] dput+0x37/0x3e0
[ 16.177206] [<path_put at namei.c:498>] path_put+0x11/0x20
[ 16.177324] [<d_real_path at gracl.c:315>] d_real_path+0xfe/0x110
[ 16.177443] [<gr_to_filename at gracl.c:363>] ? gr_to_filename+0x26/0x30
[ 16.177562] [<gr_to_filename at gracl.c:363>] gr_to_filename+0x26/0x30
[ 16.177681] [<gr_log_varargs at grsec_log.c:214 (discriminator 4)>] gr_log_varargs+0x148c/0x2b80
[ 16.177846] [<gr_log_varargs at grsec_log.c:142>] ? gr_log_middle_varargs+0x80/0x80
[ 16.177968] [<mark_held_locks at lockdep.c:2541>] ? mark_held_locks+0x79/0xa0
[ 16.178094] [<_raw_spin_unlock_irqrestore at paravirt.h:839>] ? _raw_spin_unlock_irqrestore+0x31/0x70
[ 16.178223] [<attach_recursive_mnt at namespace.c:1956>] ? attach_recursive_mnt+0x145/0x280
[ 16.178347] [<xen_clocksource_read at preempt.h:74>] ? xen_clocksource_read+0x1c/0x30
[ 16.178472] [<mutex_unlock at mutex.c:438>] ? mutex_unlock+0x9/0x10
[ 16.178589] [<xen_clocksource_read at preempt.h:74>] ? xen_clocksource_read+0x1c/0x30
[ 16.178714] [<sched_clock at paravirt.h:189>] ? sched_clock+0x13/0x20
[ 16.178834] [<local_clock at clock.c:392>] ? local_clock+0x1c/0x20
[ 16.178953] [<lock_release at lockdep.c:3613>] ? lock_release+0x314/0x680
[ 16.179072] [<lock_release at lockdep.c:3613>] ? lock_release+0x314/0x680
[ 16.179192] [<__raw_callee_save___pv_queued_spin_unlock at ??:?>] ? __raw_callee_save___pv_queued_spin_unlock+0x11/0x20
[ 16.179392] [<trace_hardirqs_on_caller at lockdep.c:2570>] ? trace_hardirqs_on_caller+0x13d/0x1d0
[ 16.179516] [<mutex_unlock at mutex.c:438>] ? mutex_unlock+0x9/0x10
[ 16.179635] [<gr_log_mount at grsec_mount.c:36>] gr_log_mount+0x3a/0x40
[ 16.179753] [<do_mount at namespace.c:2749>] do_mount+0x9c/0xdb0
[ 16.179875] [<__check_object_size.part.38 at exec.c:2203>] ? __check_object_size.part.38+0x2f/0x1d0
[ 16.179999] [<__check_object_size at exec.c:2217>] ? __check_object_size+0x15/0x20
[ 16.180137] [<sys_mount at namespace.c:2941>] SyS_mount+0x86/0xd0
[ 16.180258] [<entry_SYSCALL_64_fastpath at entry_64.S:596>] entry_SYSCALL_64_fastpath+0x16/0x7e
[ 16.180407] BUG: sleeping function called from invalid context at kernel/fs/dcache.c:757
[ 16.180581] in_atomic(): 1, irqs_disabled(): 0, pid: 214, name: mount
[ 16.180701] INFO: lockdep is turned off.
Any clues?