====================================== | [ 49.492102][ C3] ret_from_fork_asm (arch/x86/entry/entry_64.S:256) | [ 49.492232][ C3] | [ 49.492299][ C3] | [ 49.492299][ C3] stack backtrace: [ 49.492733][ C3] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014 [ 49.493101][ C3] Call Trace: [ 49.493201][ C3] [ 49.493271][ C3] dump_stack_lvl (lib/dump_stack.c:117) [ 49.493406][ C3] print_irq_inversion_bug.part.0 (kernel/locking/lockdep.c:4024) [ 49.493570][ C3] ? kernel_text_address (kernel/extable.c:99) [ 49.493777][ C3] ? __pfx_print_irq_inversion_bug.part.0 (kernel/locking/lockdep.c:4024) [ 49.493946][ C3] ? __pfx_usage_skip (kernel/locking/lockdep.c:2264) [ 49.494082][ C3] ? __pfx_usage_match (kernel/locking/lockdep.c:2256) [ 49.494213][ C3] ? arch_stack_walk (arch/x86/kernel/stacktrace.c:24) [ 49.494423][ C3] mark_lock_irq (kernel/locking/lockdep.c:4244) [ 49.494555][ C3] ? ret_from_fork_asm (arch/x86/entry/entry_64.S:256) [ 49.494689][ C3] ? __pfx_mark_lock_irq (kernel/locking/lockdep.c:4207) [ 49.494821][ C3] ? __pfx_stack_trace_save (kernel/stacktrace.c:114) [ 49.495029][ C3] ? add_chain_cache (kernel/locking/lockdep.c:3730) [ 49.495167][ C3] ? save_trace (kernel/locking/lockdep.c:586) [ 49.495299][ C3] mark_lock (kernel/locking/lockdep.c:4678) [ 49.495400][ C3] mark_usage (kernel/locking/lockdep.c:4567) [ 49.495501][ C3] __lock_acquire (kernel/locking/lockdep.c:5091) [ 49.495707][ C3] ? __lock_acquire (kernel/locking/lockdep.c:5137) [ 49.495842][ C3] ? __pfx_br_forward_delay_timer_expired (net/bridge/br_stp_timer.c:80) bridge [ 49.496075][ C3] lock_acquire.part.0 (kernel/locking/lockdep.c:467 kernel/locking/lockdep.c:5756) [ 49.496206][ C3] ? br_forward_delay_timer_expired (net/bridge/br_stp_timer.c:87) bridge [ 49.496556][ C3] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5719) [ 49.496688][ C3] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 52)) [ 49.496820][ C3] ? br_forward_delay_timer_expired (net/bridge/br_stp_timer.c:87) bridge [ 49.497019][ C3] ? lock_acquire (kernel/locking/lockdep.c:5727) [ 49.497223][ C3] ? br_forward_delay_timer_expired (net/bridge/br_stp_timer.c:87) bridge [ 49.497425][ C3] _raw_spin_lock (./include/linux/spinlock_api_smp.h:134 kernel/locking/spinlock.c:154) [ 49.497556][ C3] ? br_forward_delay_timer_expired (net/bridge/br_stp_timer.c:87) bridge [ 49.497834][ C3] br_forward_delay_timer_expired (net/bridge/br_stp_timer.c:87) bridge [ 49.498041][ C3] ? __pfx_br_forward_delay_timer_expired (net/bridge/br_stp_timer.c:80) bridge [ 49.498272][ C3] call_timer_fn (kernel/time/timer.c:1793) [ 49.498405][ C3] ? call_timer_fn (./include/linux/lockdep.h:31 kernel/time/timer.c:1783) [ 49.498609][ C3] ? call_timer_fn (./include/linux/lockdep.h:31 kernel/time/timer.c:1783) [ 49.498740][ C3] ? __pfx_call_timer_fn (kernel/time/timer.c:1770) [ 49.498871][ C3] ? mark_lock (kernel/locking/lockdep.c:4656 (discriminator 3)) [ 49.498979][ C3] __run_timers (kernel/time/timer.c:1845 kernel/time/timer.c:2418) [ 49.499186][ C3] ? __pfx_br_forward_delay_timer_expired (net/bridge/br_stp_timer.c:80) bridge [ 49.499421][ C3] ? __pfx___run_timers (kernel/time/timer.c:2389) [ 49.499552][ C3] ? __lock_release (kernel/locking/lockdep.c:5430) [ 49.499684][ C3] ? 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) [ 49.499889][ C3] ? __pfx_do_raw_spin_lock (kernel/locking/spinlock_debug.c:114) [ 49.500020][ C3] ? lock_acquire (kernel/locking/lockdep.c:5727) [ 49.500155][ C3] ? timer_expire_remote (kernel/time/timer.c:2429 kernel/time/timer.c:2422 kernel/time/timer.c:2181) [ 49.500294][ C3] timer_expire_remote (kernel/time/timer.c:2430 kernel/time/timer.c:2422 kernel/time/timer.c:2181) [ 49.500499][ C3] 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) [ 49.500632][ C3] ? __pfx_tmigr_handle_remote_cpu (kernel/time/timer_migration.c:869) [ 49.500798][ C3] tmigr_handle_remote_up (kernel/time/timer_migration.c:1003) [ 49.500931][ C3] tmigr_handle_remote (kernel/time/timer_migration.c:488 kernel/time/timer_migration.c:1061) [ 49.501134][ C3] ? __pfx_tmigr_handle_remote (kernel/time/timer_migration.c:1026) [ 49.501265][ C3] ? lockdep_hardirqs_on_prepare.part.0 (kernel/locking/lockdep.c:4292 kernel/locking/lockdep.c:4359) [ 49.501435][ C3] __do_softirq (kernel/softirq.c:554) [ 49.501566][ C3] ? __pfx_run_ksoftirqd (kernel/softirq.c:917) [ 49.501783][ C3] run_ksoftirqd (kernel/softirq.c:411 kernel/softirq.c:925 kernel/softirq.c:916) [ 49.501912][ C3] smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) [ 49.502049][ C3] ? __pfx_smpboot_thread_fn (kernel/smpboot.c:107) [ 49.502179][ C3] ? __pfx_smpboot_thread_fn (kernel/smpboot.c:107) [ 49.502310][ C3] kthread (kernel/kthread.c:388) [ 49.502482][ C3] ? __pfx_kthread (kernel/kthread.c:341) [ 49.502618][ C3] ret_from_fork (arch/x86/kernel/process.c:147) [ 49.502750][ C3] ? __pfx_kthread (kernel/kthread.c:341) Finger prints: ret_from_fork_asm:dump_stack_lvl:mark_lock_irq:mark_lock