====================================== | [ 15.622896][ T294] #0: ffffffffa03f1088 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_newlink (net/core/rtnetlink.c:337 net/core/rtnetlink.c:4020) | [ 15.623197][ T294] #1: ffffffffa03dfc30 ((netdev_chain).rwsem){++++}-{4:4}, at: blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368) | [ 15.623533][ T294] | [ 15.623533][ T294] stack backtrace: [ 15.624007][ T294] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 15.624217][ T294] Call Trace: [ 15.624345][ T294] [ 15.624431][ T294] dump_stack_lvl (lib/dump_stack.c:123) [ 15.624604][ T294] print_deadlock_bug (kernel/locking/lockdep.c:3040) [ 15.624776][ T294] validate_chain (kernel/locking/lockdep.c:3894) [ 15.624949][ T294] ? __pfx_validate_chain (kernel/locking/lockdep.c:3860) [ 15.625124][ T294] ? 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) [ 15.625294][ T294] ? mark_lock (kernel/locking/lockdep.c:4727 (discriminator 3)) [ 15.625424][ T294] __lock_acquire (kernel/locking/lockdep.c:5226) [ 15.625595][ T294] ? find_held_lock (kernel/locking/lockdep.c:5332) [ 15.625766][ T294] ? stack_depot_save_flags (lib/stackdepot.c:672) [ 15.625939][ T294] lock_acquire.part.0 (kernel/locking/lockdep.c:467 kernel/locking/lockdep.c:5851) [ 15.626107][ T294] ? blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368) [ 15.626319][ T294] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5814) [ 15.626493][ T294] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 37)) [ 15.626662][ T294] ? lock_acquire (kernel/locking/lockdep.c:5822) [ 15.626831][ T294] ? blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368) [ 15.627042][ T294] down_read (./arch/x86/include/asm/preempt.h:79 kernel/locking/rwsem.c:1246 kernel/locking/rwsem.c:1261 kernel/locking/rwsem.c:1526) [ 15.627172][ T294] ? blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368) [ 15.627382][ T294] ? __pfx_down_read (kernel/locking/rwsem.c:1522) [ 15.627549][ T294] ? __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) [ 15.627764][ T294] ? addrconf_ifdown.isra.0 (./include/net/addrconf.h:412 net/ipv6/addrconf.c:4033) [ 15.627932][ T294] ? addrconf_notify (net/ipv6/addrconf.c:3834) [ 15.628100][ T294] ? notifier_call_chain (kernel/notifier.c:85 (discriminator 2)) [ 15.628268][ T294] ? blocking_notifier_call_chain (kernel/notifier.c:381 kernel/notifier.c:368) [ 15.628479][ T294] ? dev_set_mtu_ext (./include/linux/notifier.h:207 net/core/dev.c:9111) [ 15.628650][ T294] ? rtnl_newlink (net/core/rtnetlink.c:345 net/core/rtnetlink.c:4022) [ 15.628820][ T294] blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368) [ 15.628993][ T294] dev_set_mtu_ext (./include/linux/notifier.h:207 net/core/dev.c:9101) [ 15.629166][ T294] ? __pfx_dev_set_mtu_ext (net/core/dev.c:9087) [ 15.629334][ T294] ? __pfx___lock_release (kernel/locking/lockdep.c:5501) [ 15.629502][ T294] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5814) [ 15.629673][ T294] ? __pfx_validate_chain (kernel/locking/lockdep.c:3860) [ 15.629843][ T294] dev_set_mtu (net/core/dev.c:9130) [ 15.629976][ T294] ? __pfx_dev_set_mtu (net/core/dev.c:9125) [ 15.630146][ T294] ? __lock_acquire (kernel/locking/lockdep.c:5226) [ 15.630316][ T294] ? __lock_release (kernel/locking/lockdep.c:5525) [ 15.630484][ T294] ? packet_notifier (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 net/packet/af_packet.c:4280) [ 15.630652][ T294] br_mtu_auto_adjust (net/bridge/br_if.c:525) bridge [ 15.630905][ T294] br_device_event (net/bridge/br.c:142) bridge [ 15.631109][ T294] ? __pfx_br_device_event (net/bridge/br.c:29) bridge [ 15.631354][ T294] ? packet_notifier (net/packet/af_packet.c:4282) [ 15.631525][ T294] notifier_call_chain (kernel/notifier.c:85 (discriminator 2)) [ 15.631697][ T294] blocking_notifier_call_chain (kernel/notifier.c:381 kernel/notifier.c:368) [ 15.631867][ T294] dev_set_mtu_ext (./include/linux/notifier.h:207 net/core/dev.c:9111) [ 15.632037][ T294] ? __pfx_dev_set_mtu_ext (net/core/dev.c:9087) [ 15.632204][ T294] ? __pfx_stack_trace_consume_entry (kernel/stacktrace.c:83) [ 15.632414][ T294] ? __pfx_validate_chain (kernel/locking/lockdep.c:3860) [ 15.632585][ T294] ? mark_lock (kernel/locking/lockdep.c:4727 (discriminator 3)) [ 15.632719][ T294] do_setlink.constprop.0 (net/core/rtnetlink.c:3081) [ 15.632889][ T294] ? __pfx_do_setlink.constprop.0 (net/core/rtnetlink.c:2999) [ 15.633098][ T294] ? lock_acquire.part.0 (kernel/locking/lockdep.c:467 kernel/locking/lockdep.c:5851) [ 15.633267][ T294] ? rtnl_newlink (net/core/rtnetlink.c:337 net/core/rtnetlink.c:4020) [ 15.633437][ T294] ? rtnl_newlink (./include/linux/slab.h:901 net/core/rtnetlink.c:3921) [ 15.633603][ T294] ? rtnetlink_rcv_msg (net/core/rtnetlink.c:6911) [ 15.633772][ T294] ? __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) [ 15.633954][ T294] ? __pfx___mutex_trylock_common (kernel/locking/mutex.c:79) [ 15.634173][ T294] ? lock_acquire (kernel/locking/lockdep.c:5822) [ 15.634343][ T294] ? trace_contention_end (./include/trace/events/lock.h:122 (discriminator 37)) [ 15.634515][ T294] ? __mutex_lock (./arch/x86/include/asm/preempt.h:94 kernel/locking/mutex.c:595 kernel/locking/mutex.c:735) [ 15.634685][ T294] ? __pfx_do_raw_spin_lock (kernel/locking/spinlock_debug.c:114) [ 15.634854][ T294] ? rtnl_newlink (net/core/rtnetlink.c:337 net/core/rtnetlink.c:4020) [ 15.635022][ T294] ? __pfx___mutex_lock (kernel/locking/mutex.c:734) [ 15.635197][ T294] ? __rtnl_newlink (net/core/rtnetlink.c:3871) [ 15.635367][ T294] rtnl_newlink (net/core/rtnetlink.c:345 net/core/rtnetlink.c:4022) [ 15.635537][ T294] ? __pfx_rtnl_newlink (net/core/rtnetlink.c:3912) [ 15.635707][ T294] ? find_held_lock (kernel/locking/lockdep.c:5339) [ 15.635879][ T294] ? __pfx___lock_release (kernel/locking/lockdep.c:5501) [ 15.636049][ T294] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5814) [ 15.636220][ T294] ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 net/core/rtnetlink.c:6909) [ 15.636393][ T294] ? __pfx_rtnl_newlink (net/core/rtnetlink.c:3912) [ 15.636564][ T294] rtnetlink_rcv_msg (net/core/rtnetlink.c:6911) [ 15.636733][ T294] ? __pfx_rtnetlink_rcv_msg (net/core/rtnetlink.c:6814) [ 15.636901][ T294] ? 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) [ 15.637070][ T294] ? mark_lock (kernel/locking/lockdep.c:4727 (discriminator 3)) [ 15.637199][ T294] ? __lock_acquire (kernel/locking/lockdep.c:5226) [ 15.637372][ T294] netlink_rcv_skb (net/netlink/af_netlink.c:2543) [ 15.637542][ T294] ? __pfx_rtnetlink_rcv_msg (net/core/rtnetlink.c:6814) [ 15.637716][ T294] ? __pfx_netlink_rcv_skb (net/netlink/af_netlink.c:2520) [ 15.637889][ T294] ? netlink_deliver_tap (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 net/netlink/af_netlink.c:340) [ 15.638061][ T294] ? 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) [ 15.638235][ T294] netlink_unicast (net/netlink/af_netlink.c:1322 net/netlink/af_netlink.c:1348) [ 15.638406][ T294] ? __pfx_netlink_unicast (net/netlink/af_netlink.c:1333) [ 15.638575][ T294] ? find_held_lock (kernel/locking/lockdep.c:5339) [ 15.638746][ T294] ? __lock_release (kernel/locking/lockdep.c:5525) [ 15.638919][ T294] netlink_sendmsg (net/netlink/af_netlink.c:1892) [ 15.639087][ T294] ? __pfx_netlink_sendmsg (net/netlink/af_netlink.c:1811) [ 15.639255][ T294] ? _copy_from_user (./arch/x86/include/asm/smap.h:33 ./arch/x86/include/asm/uaccess_64.h:134 ./arch/x86/include/asm/uaccess_64.h:141 ./include/linux/uaccess.h:178 lib/usercopy.c:18) [ 15.639428][ T294] ____sys_sendmsg (net/socket.c:711 net/socket.c:726 net/socket.c:2594) [ 15.639597][ T294] ? __pfx_____sys_sendmsg (net/socket.c:2540) [ 15.639765][ T294] ? __pfx_copy_msghdr_from_user (net/socket.c:2520) [ 15.639978][ T294] ___sys_sendmsg (net/socket.c:2650) [ 15.640152][ T294] ? __pfx____sys_sendmsg (net/socket.c:2637) [ 15.640322][ T294] ? kasan_save_stack (mm/kasan/common.c:49) [ 15.640493][ T294] ? kasan_save_stack (mm/kasan/common.c:48) [ 15.640664][ T294] ? __kasan_record_aux_stack (mm/kasan/generic.c:544) [ 15.640833][ T294] ? __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) [ 15.641045][ T294] ? __x64_sys_close (fs/open.c:1557 fs/open.c:1539 fs/open.c:1539) [ 15.641310][ T294] ? do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) [ 15.641483][ T294] ? entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) [ 15.641693][ T294] ? __lock_acquire (kernel/locking/lockdep.c:5226) [ 15.641864][ T294] ? find_held_lock (kernel/locking/lockdep.c:5339) [ 15.642125][ T294] ? __lock_release (kernel/locking/lockdep.c:5525) [ 15.642293][ T294] ? __virt_addr_valid (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:962 ./include/linux/mmzone.h:2058 arch/x86/mm/physaddr.c:65) [ 15.642464][ T294] ? __pfx___lock_release (kernel/locking/lockdep.c:5501) [ 15.642632][ T294] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5814) [ 15.642895][ T294] __sys_sendmsg (net/socket.c:2680) [ 15.643066][ T294] ? __pfx___sys_sendmsg (net/socket.c:2665) [ 15.643235][ T294] ? __pfx_slab_free_after_rcu_debug (mm/slub.c:4643) [ 15.643450][ T294] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) [ 15.643710][ T294] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) [ 15.643920][ T294] RIP: 0033:0x7f9ab65919a7 [ 15.644100][ T294] 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) [ 15.644798][ T294] RSP: 002b:00007ffe965c3268 EFLAGS: 00000246 ORIG_RAX: 000000000000002e [ 15.645055][ T294] RAX: ffffffffffffffda RBX: 00007ffe965c39a0 RCX: 00007f9ab65919a7 [ 15.645403][ T294] RDX: 0000000000000000 RSI: 00007ffe965c32d0 RDI: 0000000000000005 [ 15.645661][ T294] RBP: 0000000000000003 R08: 0000000000000003 R09: 0000000000000078 [ 15.646010][ T294] R10: 00007f9ab644f4a8 R11: 0000000000000246 R12: 0000000000000003 Finger prints: print_deadlock_bug:validate_chain:__lock_acquire:down_read:blocking_notifier_call_chain