>] (dump_backtrace+0x0/0x100) from [] (dump_stack+0x20/0x24) [ 13.831268] r6:c07d8c2c r5:00000d07 r4:00000000 r3:00000000 [ 13.837280] [] (dump_stack+0x0/0x24) from [] (warn_slowpath_common+0x5c/0x74) [ 13.846649] [] (warn_slowpath_common+0x0/0x74) from [] (warn_slowpath_null+0x2c/0x34) [ 13.856781] r8:00000000 r7:00000000 r6:c18b8194 r5:60000093 r4:ef182000 [ 13.863708] r3:00000009 [ 13.866485] [] (warn_slowpath_null+0x0/0x34) from [] (check_flags+0x78/0x1d0) [ 13.875823] [] (check_flags+0x0/0x1d0) from [] (lock_acquire+0x4c/0x150) [ 13.884704] [] (lock_acquire+0x0/0x150) from [] (_raw_spin_lock+0x4c/0x84) [ 13.893798] [] (_raw_spin_lock+0x0/0x84) from [] (sched_ttwu_pending+0x58/0x8c) [ 13.903320] r6:ef92d040 r5:00000003 r4:c18b8180 [ 13.908233] [] (sched_ttwu_pending+0x0/0x8c) from [] (scheduler_ipi+0x18/0x1c) [ 13.917663] r6:ef183fb0 r5:00000003 r4:00000000 r3:00000001 [ 13.923645] [] (scheduler_ipi+0x0/0x1c) from [] (do_IPI+0x9c/0xfc) [ 13.932006] [] (do_IPI+0x0/0xfc) from [] (__irq_usr+0x48/0xe0) [ 13.939971] Exception stack(0xef183fb0 to 0xef183ff8) [ 13.945281] 3fa0: ffffffc3 0001500c 00000001 0001500c [ 13.953948] 3fc0: 00000050 400b45f0 400d9000 00000000 00000001 400d9600 6474e552 bea05b3c [ 13.962585] 3fe0: 400d96c0 bea059c0 400b6574 400b65d8 20000010 ffffffff [ 13.969573] r6:00000403 r5:fa240100 r4:ffffffff r3:20000010 [ 13.975585] ---[ end trace efc4896ab0fb62cb ]--- [ 13.980468] possible reason: unannotated irqs-off. [ 13.985534] irq event stamp: 1610 [ 13.989044] hardirqs last enabled at (1610): [] no_work_pending+0x8/0x2c [ 13.997131] hardirqs last disabled at (1609): [] ret_slow_syscall+0xc/0x1c [ 14.005371] softirqs last enabled at (0): [] copy_process+0x2cc/0xa24 [ 14.013183] softirqs last disabled at (0): [< (null)>] (null) Signed-off-by: Ming Lei Signed-off-by: Russell King ɮ8