====================================== | [ 51.592875][ C2] ret_from_fork_asm (arch/x86/entry/entry_64.S:256) | [ 51.593090][ C2] | [ 51.593155][ C2] | [ 51.593155][ C2] stack backtrace: [ 51.593520][ C2] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014 [ 51.593810][ C2] Call Trace: [ 51.593912][ C2] [ 51.593981][ C2] dump_stack_lvl (lib/dump_stack.c:117) [ 51.594199][ C2] print_irq_inversion_bug.part.0 (kernel/locking/lockdep.c:4024) [ 51.594378][ C2] ? kernel_text_address (kernel/extable.c:99) [ 51.594533][ C2] ? __pfx_print_irq_inversion_bug.part.0 (kernel/locking/lockdep.c:4024) [ 51.594695][ C2] ? __pfx_usage_skip (kernel/locking/lockdep.c:2264) [ 51.594920][ C2] ? __pfx_usage_match (kernel/locking/lockdep.c:2256) [ 51.595048][ C2] ? arch_stack_walk (arch/x86/kernel/stacktrace.c:24) [ 51.595183][ C2] mark_lock_irq (kernel/locking/lockdep.c:4244) [ 51.595314][ C2] ? ret_from_fork_asm (arch/x86/entry/entry_64.S:256) [ 51.595530][ C2] ? __pfx_mark_lock_irq (kernel/locking/lockdep.c:4207) [ 51.595661][ C2] ? __pfx_stack_trace_save (kernel/stacktrace.c:114) [ 51.595796][ C2] ? add_chain_cache (kernel/locking/lockdep.c:3730) [ 51.595926][ C2] ? save_trace (kernel/locking/lockdep.c:586) [ 51.596059][ C2] mark_lock (kernel/locking/lockdep.c:4678) [ 51.596235][ C2] mark_usage (kernel/locking/lockdep.c:4567) [ 51.596337][ C2] __lock_acquire (kernel/locking/lockdep.c:5091) [ 51.596481][ C2] ? __pfx_br_forward_delay_timer_expired (net/bridge/br_stp_timer.c:80) bridge [ 51.596715][ C2] lock_acquire.part.0 (kernel/locking/lockdep.c:467 kernel/locking/lockdep.c:5756) [ 51.596925][ C2] ? br_forward_delay_timer_expired (net/bridge/br_stp_timer.c:87) bridge [ 51.597128][ C2] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5719) [ 51.597279][ C2] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 52)) [ 51.597413][ C2] ? br_forward_delay_timer_expired (net/bridge/br_stp_timer.c:87) bridge [ 51.597687][ C2] ? lock_acquire (kernel/locking/lockdep.c:5727) [ 51.597819][ C2] ? br_forward_delay_timer_expired (net/bridge/br_stp_timer.c:87) bridge [ 51.598022][ C2] _raw_spin_lock (./include/linux/spinlock_api_smp.h:134 kernel/locking/spinlock.c:154) [ 51.598153][ C2] ? br_forward_delay_timer_expired (net/bridge/br_stp_timer.c:87) bridge [ 51.598441][ C2] br_forward_delay_timer_expired (net/bridge/br_stp_timer.c:87) bridge [ 51.598646][ C2] ? __pfx_br_forward_delay_timer_expired (net/bridge/br_stp_timer.c:80) bridge [ 51.598875][ C2] call_timer_fn (kernel/time/timer.c:1793) [ 51.599078][ C2] ? call_timer_fn (./include/linux/lockdep.h:31 kernel/time/timer.c:1783) [ 51.599207][ C2] ? call_timer_fn (./include/linux/lockdep.h:31 kernel/time/timer.c:1783) [ 51.599342][ C2] ? __pfx_call_timer_fn (kernel/time/timer.c:1770) [ 51.599475][ C2] ? mark_lock (kernel/locking/lockdep.c:4656 (discriminator 3)) [ 51.599654][ C2] __run_timers (kernel/time/timer.c:1845 kernel/time/timer.c:2418) [ 51.599785][ C2] ? __pfx_br_forward_delay_timer_expired (net/bridge/br_stp_timer.c:80) bridge [ 51.600014][ C2] ? __pfx___run_timers (kernel/time/timer.c:2389) [ 51.600144][ C2] ? __lock_release (kernel/locking/lockdep.c:5430) [ 51.600348][ C2] ? do_raw_spin_lock (./arch/x86/include/asm/atomic.h:115 ./include/linux/atomic/atomic-arch-fallback.h:2170 ./include/linux/atomic/atomic-instrumented.h:1302 ./include/asm-generic/qspinlock.h:111 kernel/locking/spinlock_debug.c:116) [ 51.600481][ C2] ? __pfx_do_raw_spin_lock (kernel/locking/spinlock_debug.c:114) [ 51.600621][ C2] ? lock_acquire (kernel/locking/lockdep.c:5727) [ 51.600764][ C2] ? timer_expire_remote (kernel/time/timer.c:2429 kernel/time/timer.c:2422 kernel/time/timer.c:2181) [ 51.600985][ C2] timer_expire_remote (kernel/time/timer.c:2430 kernel/time/timer.c:2422 kernel/time/timer.c:2181) [ 51.601118][ C2] tmigr_handle_remote_cpu (./arch/x86/include/asm/irqflags.h:26 ./arch/x86/include/asm/irqflags.h:67 ./arch/x86/include/asm/irqflags.h:127 kernel/time/timer_migration.c:925) [ 51.601253][ C2] ? __pfx_tmigr_handle_remote_cpu (kernel/time/timer_migration.c:869) [ 51.601422][ C2] tmigr_handle_remote_up (kernel/time/timer_migration.c:1003) [ 51.601559][ C2] tmigr_handle_remote (kernel/time/timer_migration.c:488 kernel/time/timer_migration.c:1061) [ 51.601691][ C2] ? __pfx_tmigr_handle_remote (kernel/time/timer_migration.c:1026) [ 51.601821][ C2] ? __pfx___lock_release (kernel/locking/lockdep.c:5406) [ 51.601950][ C2] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5719) [ 51.602080][ C2] __do_softirq (kernel/softirq.c:554) [ 51.602291][ C2] ? __pfx_run_ksoftirqd (kernel/softirq.c:917) [ 51.602420][ C2] run_ksoftirqd (kernel/softirq.c:411 kernel/softirq.c:925 kernel/softirq.c:916) [ 51.602553][ C2] smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) [ 51.602683][ C2] ? __pfx_smpboot_thread_fn (kernel/smpboot.c:107) [ 51.602963][ C2] ? __pfx_smpboot_thread_fn (kernel/smpboot.c:107) [ 51.603093][ C2] kthread (kernel/kthread.c:388) [ 51.603193][ C2] ? __pfx_kthread (kernel/kthread.c:341) [ 51.603331][ C2] ret_from_fork (arch/x86/kernel/process.c:147) [ 51.603535][ C2] ? __pfx_kthread (kernel/kthread.c:341) Finger prints: ret_from_fork_asm:dump_stack_lvl:mark_lock_irq:mark_lock