====================================== | [ 92.446039][ T926] #0: ffffffff9edb8650 (pernet_ops_rwsem){++++}-{3:3}, at: rtnl_link_unregister (net/core/rtnetlink.c:671 net/core/rtnetlink.c:694) | [ 92.446293][ T926] #1: ffffffff9edd3948 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_link_unregister (./include/linux/instrumented.h:68 ./include/linux/atomic/atomic-instrumented.h:32 net/core/rtnetlink.c:677 net/core/rtnetlink.c:694) | [ 92.446513][ T926] | [ 92.446513][ T926] stack backtrace: [ 92.446855][ T926] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014 [ 92.447128][ T926] Call Trace: [ 92.447230][ T926] [ 92.447296][ T926] dump_stack_lvl (lib/dump_stack.c:123) [ 92.447425][ T926] print_circular_bug (kernel/locking/lockdep.c:2077) [ 92.447552][ T926] check_noncircular (kernel/locking/lockdep.c:2206) [ 92.447683][ T926] ? __pfx_check_noncircular (kernel/locking/lockdep.c:2182) [ 92.447810][ T926] ? __kernel_text_address (kernel/extable.c:79) [ 92.447940][ T926] ? unwind_get_return_address (arch/x86/kernel/unwind_orc.c:369 arch/x86/kernel/unwind_orc.c:364) [ 92.448066][ T926] ? __pfx_stack_trace_consume_entry (kernel/stacktrace.c:83) [ 92.448223][ T926] ? arch_stack_walk (arch/x86/kernel/stacktrace.c:26) [ 92.448352][ T926] check_prev_add (kernel/locking/lockdep.c:3162) [ 92.448478][ T926] ? __pfx_stack_trace_save (kernel/stacktrace.c:114) [ 92.448604][ T926] validate_chain (kernel/locking/lockdep.c:3281 kernel/locking/lockdep.c:3904) [ 92.448732][ T926] ? __pfx_validate_chain (kernel/locking/lockdep.c:3860) [ 92.448861][ T926] ? mark_lock (kernel/locking/lockdep.c:186 kernel/locking/lockdep.c:4731) [ 92.448986][ T926] ? __pfx_validate_chain (kernel/locking/lockdep.c:3860) [ 92.449112][ T926] __lock_acquire (kernel/locking/lockdep.c:5202) [ 92.449241][ T926] lock_sync (kernel/locking/lockdep.c:467 kernel/locking/lockdep.c:5876) [ 92.449336][ T926] ? __synchronize_srcu (kernel/rcu/srcutree.c:1383) [ 92.449461][ T926] __synchronize_srcu (kernel/rcu/srcutree.c:1388) [ 92.449586][ T926] ? __pfx___synchronize_srcu (kernel/rcu/srcutree.c:1383) [ 92.449710][ T926] ? hlock_class (./arch/x86/include/asm/bitops.h:227 ./arch/x86/include/asm/bitops.h:239 ./include/asm-generic/bitops/instrumented-non-atomic.h:142 kernel/locking/lockdep.c:228) [ 92.449836][ T926] ? mark_lock (kernel/locking/lockdep.c:4703 (discriminator 3)) [ 92.449934][ T926] ? kvm_clock_get_cycles (./arch/x86/include/asm/preempt.h:94 arch/x86/kernel/kvmclock.c:80 arch/x86/kernel/kvmclock.c:86) [ 92.450059][ T926] ? ktime_get_mono_fast_ns (kernel/time/timekeeping.c:195 kernel/time/timekeeping.c:395 kernel/time/timekeeping.c:449 kernel/time/timekeeping.c:489) [ 92.450183][ T926] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4347 kernel/locking/lockdep.c:4406) [ 92.450340][ T926] __rtnl_link_unregister (net/core/rtnetlink.c:657) [ 92.450465][ T926] ? mark_lock (kernel/locking/lockdep.c:4703 (discriminator 3)) [ 92.450560][ T926] ? __pfx___rtnl_link_unregister (net/core/rtnetlink.c:652) [ 92.450714][ T926] ? mark_held_locks (kernel/locking/lockdep.c:4321) [ 92.450845][ T926] rtnl_link_unregister (net/core/rtnetlink.c:152 net/core/rtnetlink.c:696) [ 92.450971][ T926] ? __pfx_rtnl_link_unregister (net/core/rtnetlink.c:691) [ 92.451097][ T926] ? __pfx_woken_wake_function (kernel/sched/wait.c:439) [ 92.451223][ T926] nsim_module_exit (drivers/net/netdevsim/netdev.c:99) netdevsim [ 92.451358][ T926] __do_sys_delete_module (kernel/module/main.c:757) [ 92.451483][ T926] ? __pfx___do_sys_delete_module (kernel/module/main.c:702) [ 92.451637][ T926] ? __pfx_slab_free_after_rcu_debug (mm/slub.c:4609) [ 92.451795][ T926] ? __pfx_slab_free_after_rcu_debug (mm/slub.c:4609) [ 92.451951][ T926] ? trace_rcu_segcb_stats (./arch/x86/include/asm/bitops.h:227 ./arch/x86/include/asm/bitops.h:239 ./include/asm-generic/bitops/instrumented-non-atomic.h:142 ./include/linux/cpumask.h:570 ./include/linux/cpumask.h:1117 ./include/trace/events/rcu.h:537) [ 92.452076][ T926] ? __pfx_slab_free_after_rcu_debug (mm/slub.c:4609) [ 92.452230][ T926] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4347 kernel/locking/lockdep.c:4406) [ 92.452385][ T926] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) [ 92.452513][ T926] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) [ 92.452665][ T926] RIP: 0033:0x7f75b2da45ab [ 92.452796][ T926] Code: 73 01 c3 48 8b 0d 55 98 1b 00 f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 90 f3 0f 1e fa b8 b0 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d 25 98 1b 00 f7 d8 64 89 01 48 All code ======== 0: 73 01 jae 0x3 2: c3 ret 3: 48 8b 0d 55 98 1b 00 mov 0x1b9855(%rip),%rcx # 0x1b985f a: f7 d8 neg %eax c: 64 89 01 mov %eax,%fs:(%rcx) f: 48 83 c8 ff or $0xffffffffffffffff,%rax 13: c3 ret 14: 66 2e 0f 1f 84 00 00 cs nopw 0x0(%rax,%rax,1) 1b: 00 00 00 1e: 90 nop 1f: f3 0f 1e fa endbr64 23: b8 b0 00 00 00 mov $0xb0,%eax 28: 0f 05 syscall 2a:* 48 3d 01 f0 ff ff cmp $0xfffffffffffff001,%rax <-- trapping instruction 30: 73 01 jae 0x33 32: c3 ret 33: 48 8b 0d 25 98 1b 00 mov 0x1b9825(%rip),%rcx # 0x1b985f 3a: f7 d8 neg %eax 3c: 64 89 01 mov %eax,%fs:(%rcx) 3f: 48 rex.W Code starting with the faulting instruction =========================================== 0: 48 3d 01 f0 ff ff cmp $0xfffffffffffff001,%rax 6: 73 01 jae 0x9 8: c3 ret 9: 48 8b 0d 25 98 1b 00 mov 0x1b9825(%rip),%rcx # 0x1b9835 10: f7 d8 neg %eax 12: 64 89 01 mov %eax,%fs:(%rcx) 15: 48 rex.W [ 92.453233][ T926] RSP: 002b:00007ffc66e41d88 EFLAGS: 00000206 ORIG_RAX: 00000000000000b0 [ 92.453420][ T926] RAX: ffffffffffffffda RBX: 0000559fb950c980 RCX: 00007f75b2da45ab [ 92.453607][ T926] RDX: 0000000000000000 RSI: 0000000000000800 RDI: 0000559fb950c9e8 [ 92.453794][ T926] RBP: 0000559fb950c980 R08: 0000000000000000 R09: 0000000000000000 [ 92.453980][ T926] R10: 00007f75b2f03ac0 R11: 0000000000000206 R12: 0000559fb950c9e8 Finger prints: print_circular_bug:check_noncircular:check_prev_add:validate_chain:__lock_acquire