====================================== | [ 17.069563][ T402] #0: ffffffffa19e7a48 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_newlink (net/core/rtnetlink.c:337 net/core/rtnetlink.c:4020) | [ 17.069899][ T402] #1: ffffffffa19d6630 ((netdev_chain).rwsem){++++}-{4:4}, at: blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368) | [ 17.070283][ T402] | [ 17.070283][ T402] stack backtrace: [ 17.070754][ T402] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 17.070967][ T402] Call Trace: [ 17.071096][ T402] [ 17.071187][ T402] dump_stack_lvl (lib/dump_stack.c:123) [ 17.071363][ T402] print_deadlock_bug (kernel/locking/lockdep.c:3040) [ 17.071536][ T402] validate_chain (kernel/locking/lockdep.c:3894) [ 17.071711][ T402] ? __pfx_validate_chain (kernel/locking/lockdep.c:3860) [ 17.071884][ T402] ? 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) [ 17.072051][ T402] ? mark_lock (kernel/locking/lockdep.c:4727 (discriminator 3)) [ 17.072189][ T402] __lock_acquire (kernel/locking/lockdep.c:5226) [ 17.072358][ T402] ? rcu_read_lock_any_held (kernel/rcu/update.c:386 kernel/rcu/update.c:380) [ 17.072530][ T402] lock_acquire.part.0 (kernel/locking/lockdep.c:467 kernel/locking/lockdep.c:5851) [ 17.072700][ T402] ? blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368) [ 17.072914][ T402] ? __pfx_validate_chain (kernel/locking/lockdep.c:3860) [ 17.073086][ T402] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5814) [ 17.073256][ T402] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 37)) [ 17.073429][ T402] ? lock_acquire (kernel/locking/lockdep.c:5822) [ 17.073616][ T402] ? blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368) [ 17.073829][ T402] down_read (./arch/x86/include/asm/preempt.h:79 kernel/locking/rwsem.c:1246 kernel/locking/rwsem.c:1261 kernel/locking/rwsem.c:1526) [ 17.073958][ T402] ? blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368) [ 17.074172][ T402] ? __pfx_down_read (kernel/locking/rwsem.c:1522) [ 17.074341][ T402] ? find_held_lock (kernel/locking/lockdep.c:5339) [ 17.074516][ T402] blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368) [ 17.074685][ T402] dev_set_mtu_ext (./include/linux/notifier.h:207 net/core/dev.c:9101) [ 17.074857][ T402] ? __pfx_dev_set_mtu_ext (net/core/dev.c:9087) [ 17.075028][ T402] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4339 kernel/locking/lockdep.c:4406) [ 17.075237][ T402] ? fib6_walk (net/ipv6/ip6_fib.c:2175) [ 17.075413][ T402] ? __local_bh_enable_ip (./arch/x86/include/asm/irqflags.h:42 ./arch/x86/include/asm/irqflags.h:97 kernel/softirq.c:394) [ 17.075585][ T402] ? __pfx_validate_chain (kernel/locking/lockdep.c:3860) [ 17.075755][ T402] dev_set_mtu (net/core/dev.c:9130) [ 17.075889][ T402] ? __pfx_dev_set_mtu (net/core/dev.c:9125) [ 17.076059][ T402] ? __lock_acquire (kernel/locking/lockdep.c:5226) [ 17.076231][ T402] ? __lock_release (kernel/locking/lockdep.c:5525) [ 17.076399][ T402] ? packet_notifier (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 net/packet/af_packet.c:4280) [ 17.076572][ T402] br_mtu_auto_adjust (net/bridge/br_if.c:525) bridge [ 17.076829][ T402] br_device_event (net/bridge/br.c:142) bridge [ 17.077036][ T402] ? __pfx_br_device_event (net/bridge/br.c:29) bridge [ 17.077278][ T402] ? packet_notifier (net/packet/af_packet.c:4282) [ 17.077456][ T402] notifier_call_chain (kernel/notifier.c:85 (discriminator 2)) [ 17.077643][ T402] blocking_notifier_call_chain (kernel/notifier.c:381 kernel/notifier.c:368) [ 17.077813][ T402] dev_set_mtu_ext (./include/linux/notifier.h:207 net/core/dev.c:9111) [ 17.077981][ T402] ? __pfx_dev_set_mtu_ext (net/core/dev.c:9087) [ 17.078155][ T402] ? __pfx_stack_trace_consume_entry (kernel/stacktrace.c:83) [ 17.078368][ T402] ? __pfx_validate_chain (kernel/locking/lockdep.c:3860) [ 17.078540][ T402] ? mark_lock (kernel/locking/lockdep.c:4727 (discriminator 3)) [ 17.078670][ T402] do_setlink.constprop.0 (net/core/rtnetlink.c:3081) [ 17.078846][ T402] ? __pfx_do_setlink.constprop.0 (net/core/rtnetlink.c:2999) [ 17.079055][ T402] ? lock_acquire.part.0 (kernel/locking/lockdep.c:467 kernel/locking/lockdep.c:5851) [ 17.079228][ T402] ? rtnl_newlink (net/core/rtnetlink.c:337 net/core/rtnetlink.c:4020) [ 17.079399][ T402] ? rtnl_newlink (./include/linux/slab.h:901 net/core/rtnetlink.c:3921) [ 17.079567][ T402] ? rtnetlink_rcv_msg (net/core/rtnetlink.c:6911) [ 17.079738][ T402] ? __mutex_trylock_common (./arch/x86/include/asm/atomic64_64.h:101 ./include/linux/atomic/atomic-arch-fallback.h:4296 ./include/linux/atomic/atomic-long.h:1482 ./include/linux/atomic/atomic-instrumented.h:4458 kernel/locking/mutex.c:104) [ 17.079909][ T402] ? __pfx___mutex_trylock_common (kernel/locking/mutex.c:79) [ 17.080122][ T402] ? lock_acquire (kernel/locking/lockdep.c:5822) [ 17.080304][ T402] ? trace_contention_end (./include/trace/events/lock.h:122 (discriminator 37)) [ 17.080480][ T402] ? __mutex_lock (./arch/x86/include/asm/preempt.h:94 kernel/locking/mutex.c:595 kernel/locking/mutex.c:735) [ 17.080648][ T402] ? __pfx_do_raw_spin_lock (kernel/locking/spinlock_debug.c:114) [ 17.080822][ T402] ? rtnl_newlink (net/core/rtnetlink.c:337 net/core/rtnetlink.c:4020) [ 17.080990][ T402] ? __pfx___mutex_lock (kernel/locking/mutex.c:734) [ 17.081163][ T402] ? __rtnl_newlink (net/core/rtnetlink.c:3871) [ 17.081333][ T402] rtnl_newlink (net/core/rtnetlink.c:345 net/core/rtnetlink.c:4022) [ 17.081523][ T402] ? __pfx_rtnl_newlink (net/core/rtnetlink.c:3912) [ 17.081693][ T402] ? find_held_lock (kernel/locking/lockdep.c:5339) [ 17.081869][ T402] ? __pfx___lock_release (kernel/locking/lockdep.c:5501) [ 17.082038][ T402] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5814) [ 17.082210][ T402] ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 net/core/rtnetlink.c:6909) [ 17.082379][ T402] ? __pfx_rtnl_newlink (net/core/rtnetlink.c:3912) [ 17.082549][ T402] rtnetlink_rcv_msg (net/core/rtnetlink.c:6911) [ 17.082718][ T402] ? __pfx_rtnetlink_rcv_msg (net/core/rtnetlink.c:6814) [ 17.082888][ T402] ? 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) [ 17.083061][ T402] ? mark_lock (kernel/locking/lockdep.c:4727 (discriminator 3)) [ 17.083191][ T402] ? __lock_acquire (kernel/locking/lockdep.c:5226) [ 17.083362][ T402] netlink_rcv_skb (net/netlink/af_netlink.c:2543) [ 17.083533][ T402] ? __pfx_rtnetlink_rcv_msg (net/core/rtnetlink.c:6814) [ 17.083704][ T402] ? __pfx_netlink_rcv_skb (net/netlink/af_netlink.c:2520) [ 17.083876][ T402] ? netlink_deliver_tap (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 net/netlink/af_netlink.c:340) [ 17.084047][ T402] ? netlink_deliver_tap (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 ./include/net/netns/generic.h:48 net/netlink/af_netlink.c:333) [ 17.084226][ T402] netlink_unicast (net/netlink/af_netlink.c:1322 net/netlink/af_netlink.c:1348) [ 17.084395][ T402] ? __pfx_netlink_unicast (net/netlink/af_netlink.c:1333) [ 17.084565][ T402] ? find_held_lock (kernel/locking/lockdep.c:5339) [ 17.084735][ T402] netlink_sendmsg (net/netlink/af_netlink.c:1892) [ 17.084908][ T402] ? __pfx_netlink_sendmsg (net/netlink/af_netlink.c:1811) [ 17.085080][ T402] ____sys_sendmsg (net/socket.c:711 net/socket.c:726 net/socket.c:2594) [ 17.085251][ T402] ? __pfx_____sys_sendmsg (net/socket.c:2540) [ 17.085425][ T402] ? __pfx_copy_msghdr_from_user (net/socket.c:2520) [ 17.085659][ T402] ___sys_sendmsg (net/socket.c:2650) [ 17.085832][ T402] ? __pfx____sys_sendmsg (net/socket.c:2637) [ 17.086001][ T402] ? kasan_save_stack (mm/kasan/common.c:49) [ 17.086175][ T402] ? kasan_save_stack (mm/kasan/common.c:48) [ 17.086344][ T402] ? __kasan_record_aux_stack (mm/kasan/generic.c:544) [ 17.086514][ T402] ? __call_rcu_common.constprop.0 (./arch/x86/include/asm/irqflags.h:26 ./arch/x86/include/asm/irqflags.h:87 ./arch/x86/include/asm/irqflags.h:123 kernel/rcu/tree.c:3087) [ 17.086732][ T402] ? __x64_sys_close (fs/open.c:1557 fs/open.c:1539 fs/open.c:1539) [ 17.086900][ T402] ? do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) [ 17.087069][ T402] ? entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) [ 17.087281][ T402] ? __lock_acquire (kernel/locking/lockdep.c:5226) [ 17.087451][ T402] ? find_held_lock (kernel/locking/lockdep.c:5339) [ 17.087622][ T402] ? __lock_release (kernel/locking/lockdep.c:5525) [ 17.087791][ T402] ? __virt_addr_valid (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:962 ./include/linux/mmzone.h:2058 arch/x86/mm/physaddr.c:65) [ 17.087960][ T402] ? __pfx___lock_release (kernel/locking/lockdep.c:5501) [ 17.088129][ T402] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5814) [ 17.088301][ T402] __sys_sendmsg (net/socket.c:2680) [ 17.088469][ T402] ? __pfx___sys_sendmsg (net/socket.c:2665) [ 17.088636][ T402] ? __pfx_slab_free_after_rcu_debug (mm/slub.c:4643) [ 17.088851][ T402] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) [ 17.089024][ T402] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) [ 17.089230][ T402] RIP: 0033:0x7f0ca98c29a7 [ 17.089415][ T402] Code: 0a 00 f7 d8 64 89 02 48 c7 c0 ff ff ff ff eb b9 0f 1f 00 f3 0f 1e fa 64 8b 04 25 18 00 00 00 85 c0 75 10 b8 2e 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 51 c3 48 83 ec 28 89 54 24 1c 48 89 74 24 10 All code ======== 0: 0a 00 or (%rax),%al 2: f7 d8 neg %eax 4: 64 89 02 mov %eax,%fs:(%rdx) 7: 48 c7 c0 ff ff ff ff mov $0xffffffffffffffff,%rax e: eb b9 jmp 0xffffffffffffffc9 10: 0f 1f 00 nopl (%rax) 13: f3 0f 1e fa endbr64 17: 64 8b 04 25 18 00 00 mov %fs:0x18,%eax 1e: 00 1f: 85 c0 test %eax,%eax 21: 75 10 jne 0x33 23: b8 2e 00 00 00 mov $0x2e,%eax 28: 0f 05 syscall 2a:* 48 3d 00 f0 ff ff cmp $0xfffffffffffff000,%rax <-- trapping instruction 30: 77 51 ja 0x83 32: c3 ret 33: 48 83 ec 28 sub $0x28,%rsp 37: 89 54 24 1c mov %edx,0x1c(%rsp) 3b: 48 89 74 24 10 mov %rsi,0x10(%rsp) Code starting with the faulting instruction =========================================== 0: 48 3d 00 f0 ff ff cmp $0xfffffffffffff000,%rax 6: 77 51 ja 0x59 8: c3 ret 9: 48 83 ec 28 sub $0x28,%rsp d: 89 54 24 1c mov %edx,0x1c(%rsp) 11: 48 89 74 24 10 mov %rsi,0x10(%rsp) [ 17.090033][ T402] RSP: 002b:00007ffc16ef6f38 EFLAGS: 00000246 ORIG_RAX: 000000000000002e [ 17.090307][ T402] RAX: ffffffffffffffda RBX: 00007ffc16ef7660 RCX: 00007f0ca98c29a7 [ 17.090569][ T402] RDX: 0000000000000000 RSI: 00007ffc16ef6fa0 RDI: 0000000000000005 [ 17.090825][ T402] RBP: 0000000000000004 R08: 0000000000000003 R09: 0000000000000078 [ 17.091079][ T402] R10: 00007f0ca9780ef8 R11: 0000000000000246 R12: 0000000000000004 Finger prints: print_deadlock_bug:validate_chain:__lock_acquire:down_read:blocking_notifier_call_chain