====================================== | [ 3966.423835][ T71] ================================================================== | [ 3966.424319][ T71] BUG: KASAN: slab-use-after-free in vxlan_netdevice_event (drivers/net/vxlan/vxlan_core.c:4613 drivers/net/vxlan/vxlan_core.c:4636) vxlan | [ 3966.424792][ T71] Read of size 8 at addr ffff88800ac48bd0 by task kworker/u8:1/71 | [ 3966.425182][ T71] [ 3966.425706][ T71] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014 [ 3966.426322][ T71] Workqueue: netns cleanup_net [ 3966.426577][ T71] Call Trace: [ 3966.426746][ T71] [ 3966.426902][ T71] dump_stack_lvl (lib/dump_stack.c:107) [ 3966.427135][ T71] print_address_description.constprop.0 (mm/kasan/report.c:378) [ 3966.427505][ T71] ? vxlan_netdevice_event (drivers/net/vxlan/vxlan_core.c:4613 drivers/net/vxlan/vxlan_core.c:4636) vxlan [ 3966.427825][ T71] print_report (mm/kasan/report.c:489) [ 3966.428052][ T71] ? kasan_addr_to_slab (./arch/x86/include/asm/bitops.h:206 ./arch/x86/include/asm/bitops.h:238 ./include/asm-generic/bitops/instrumented-non-atomic.h:142 ./include/linux/page-flags.h:481 mm/kasan/../slab.h:206 mm/kasan/common.c:38) [ 3966.428307][ T71] kasan_report (mm/kasan/report.c:603) [ 3966.428525][ T71] ? vxlan_netdevice_event (drivers/net/vxlan/vxlan_core.c:4613 drivers/net/vxlan/vxlan_core.c:4636) vxlan [ 3966.428849][ T71] vxlan_netdevice_event (drivers/net/vxlan/vxlan_core.c:4613 drivers/net/vxlan/vxlan_core.c:4636) vxlan [ 3966.429162][ T71] ? __pfx_vlan_device_event (net/8021q/vlan.c:362) 8021q [ 3966.429482][ T71] ? __pfx_vxlan_netdevice_event (drivers/net/vxlan/vxlan_core.c:4631) vxlan [ 3966.429820][ T71] ? netconsole_netdev_event (drivers/net/netconsole.c:991) [ 3966.430108][ T71] notifier_call_chain (kernel/notifier.c:93) [ 3966.430369][ T71] unregister_netdevice_many_notify (net/core/dev.c:11095) [ 3966.430693][ T71] ? mutex_is_locked (./arch/x86/include/asm/atomic64_64.h:15 ./include/linux/atomic/atomic-arch-fallback.h:2569 ./include/linux/atomic/atomic-long.h:38 ./include/linux/atomic/atomic-instrumented.h:3161 kernel/locking/mutex.c:81 kernel/locking/mutex.c:91) [ 3966.430937][ T71] ? __pfx_unregister_netdevice_many_notify (net/core/dev.c:11035) [ 3966.431278][ T71] ? vrf_dellink (drivers/net/vrf.c:1708) vrf [ 3966.431545][ T71] ? __pfx_unregister_netdevice_queue (net/core/dev.c:11019) [ 3966.431862][ T71] default_device_exit_batch (net/core/dev.c:11629) [ 3966.432144][ T71] ? __pfx_default_device_exit_batch (net/core/dev.c:11604) [ 3966.432454][ T71] ? mutex_is_locked (./arch/x86/include/asm/atomic64_64.h:15 ./include/linux/atomic/atomic-arch-fallback.h:2569 ./include/linux/atomic/atomic-long.h:38 ./include/linux/atomic/atomic-instrumented.h:3161 kernel/locking/mutex.c:81 kernel/locking/mutex.c:91) [ 3966.432697][ T71] ? nexthop_net_exit_batch_rtnl (net/ipv4/nexthop.c:569 net/ipv4/nexthop.c:1918 net/ipv4/nexthop.c:2426 net/ipv4/nexthop.c:3754) [ 3966.432997][ T71] cleanup_net (net/core/net_namespace.c:636 (discriminator 3)) [ 3966.433222][ T71] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5719) [ 3966.433515][ T71] ? __pfx_cleanup_net (net/core/net_namespace.c:581) [ 3966.433763][ T71] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5725) [ 3966.434000][ T71] ? process_one_work (kernel/workqueue.c:2609) [ 3966.434261][ T71] process_one_work (kernel/workqueue.c:2633) [ 3966.434513][ T71] ? 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) [ 3966.434744][ T71] ? __pfx_process_one_work (kernel/workqueue.c:2542) [ 3966.435017][ T71] ? assign_work (kernel/workqueue.c:1101) [ 3966.435253][ T71] worker_thread (kernel/workqueue.c:2700 kernel/workqueue.c:2787) [ 3966.435491][ T71] ? lockdep_hardirqs_on_prepare.part.0 (kernel/locking/lockdep.c:4300 kernel/locking/lockdep.c:4359) [ 3966.435821][ T71] ? __pfx_worker_thread (kernel/workqueue.c:2733) [ 3966.436081][ T71] ? __pfx_worker_thread (kernel/workqueue.c:2733) [ 3966.436339][ T71] kthread (kernel/kthread.c:388) [ 3966.436544][ T71] ? __pfx_kthread (kernel/kthread.c:341) [ 3966.436779][ T71] ret_from_fork (arch/x86/kernel/process.c:147) [ 3966.437003][ T71] ? __pfx_kthread (kernel/kthread.c:341) [ 3966.437236][ T71] ret_from_fork_asm (arch/x86/entry/entry_64.S:250) | [ 3966.455861][ T71] ================================================================== | [ 3966.457140][ T71] Disabling lock debugging due to kernel taint | [ 3966.457549][ T71] general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] PREEMPT SMP KASAN NOPTI | [ 3966.458156][ T71] KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007] [ 3966.459042][ T71] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014 [ 3966.459650][ T71] Workqueue: netns cleanup_net [ 3966.459897][ T71] RIP: 0010:vxlan_netdevice_event (drivers/net/vxlan/vxlan_core.c:4613 drivers/net/vxlan/vxlan_core.c:4636) vxlan [ 3966.460252][ T71] Code: 00 00 00 48 b9 00 00 00 00 00 fc ff df 49 89 c0 48 89 44 24 08 49 c1 e8 03 4d 8d 24 08 eb 2c 48 8d 53 30 48 89 d0 48 c1 e8 03 <80> 3c 08 00 0f 85 e0 00 00 00 48 8b 43 30 49 89 dd 48 83 e8 30 49 All code ======== 0: 00 00 add %al,(%rax) 2: 00 48 b9 add %cl,-0x47(%rax) 5: 00 00 add %al,(%rax) 7: 00 00 add %al,(%rax) 9: 00 fc add %bh,%ah b: ff (bad) c: df 49 89 fisttps -0x77(%rcx) f: c0 48 89 44 rorb $0x44,-0x77(%rax) 13: 24 08 and $0x8,%al 15: 49 c1 e8 03 shr $0x3,%r8 19: 4d 8d 24 08 lea (%r8,%rcx,1),%r12 1d: eb 2c jmp 0x4b 1f: 48 8d 53 30 lea 0x30(%rbx),%rdx 23: 48 89 d0 mov %rdx,%rax 26: 48 c1 e8 03 shr $0x3,%rax 2a:* 80 3c 08 00 cmpb $0x0,(%rax,%rcx,1) <-- trapping instruction 2e: 0f 85 e0 00 00 00 jne 0x114 34: 48 8b 43 30 mov 0x30(%rbx),%rax 38: 49 89 dd mov %rbx,%r13 3b: 48 83 e8 30 sub $0x30,%rax 3f: 49 rex.WB Code starting with the faulting instruction =========================================== 0: 80 3c 08 00 cmpb $0x0,(%rax,%rcx,1) 4: 0f 85 e0 00 00 00 jne 0xea a: 48 8b 43 30 mov 0x30(%rbx),%rax e: 49 89 dd mov %rbx,%r13 11: 48 83 e8 30 sub $0x30,%rax 15: 49 rex.WB [ 3966.461220][ T71] RSP: 0018:ffffc9000051f980 EFLAGS: 00010246 [ 3966.461524][ T71] RAX: 0000000000000000 RBX: ffffffffffffffd0 RCX: dffffc0000000000 [ 3966.461924][ T71] RDX: 0000000000000000 RSI: 0000000000000004 RDI: ffff88800ac48c24 [ 3966.462319][ T71] RBP: 1ffff920000a3f33 R08: 1ffff11000e9581a R09: ffffc9000051f9b8 [ 3966.462770][ T71] R10: ffffffffb153ca07 R11: 205d313754202020 R12: ffffed1000e9581a [ 3966.463161][ T71] R13: ffff88800ac48ba0 R14: ffff888006884000 R15: ffff8880074ac000 [ 3966.463598][ T71] FS: 0000000000000000(0000) GS:ffff88802e800000(0000) knlGS:0000000000000000 [ 3966.464045][ T71] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 3966.464380][ T71] CR2: 00007f1658881270 CR3: 000000000941e002 CR4: 0000000000770ef0 [ 3966.464777][ T71] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 3966.465179][ T71] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 3966.465582][ T71] PKRU: 55555554 [ 3966.465761][ T71] Call Trace: [ 3966.465927][ T71] [ 3966.466079][ T71] ? die_addr (arch/x86/kernel/dumpstack.c:421 arch/x86/kernel/dumpstack.c:460) [ 3966.466292][ T71] ? exc_general_protection (arch/x86/kernel/traps.c:701 arch/x86/kernel/traps.c:643) [ 3966.466579][ T71] ? asm_exc_general_protection (./arch/x86/include/asm/idtentry.h:564) [ 3966.466873][ T71] ? vxlan_netdevice_event (drivers/net/vxlan/vxlan_core.c:4613 drivers/net/vxlan/vxlan_core.c:4636) vxlan [ 3966.467199][ T71] ? __pfx_vxlan_netdevice_event (drivers/net/vxlan/vxlan_core.c:4631) vxlan [ 3966.467537][ T71] ? netconsole_netdev_event (drivers/net/netconsole.c:991) [ 3966.467829][ T71] notifier_call_chain (kernel/notifier.c:93) [ 3966.468086][ T71] unregister_netdevice_many_notify (net/core/dev.c:11095) [ 3966.468411][ T71] ? mutex_is_locked (./arch/x86/include/asm/atomic64_64.h:15 ./include/linux/atomic/atomic-arch-fallback.h:2569 ./include/linux/atomic/atomic-long.h:38 ./include/linux/atomic/atomic-instrumented.h:3161 kernel/locking/mutex.c:81 kernel/locking/mutex.c:91) [ 3966.468654][ T71] ? __pfx_unregister_netdevice_many_notify (net/core/dev.c:11035) [ 3966.468993][ T71] ? vrf_dellink (drivers/net/vrf.c:1708) vrf [ 3966.469261][ T71] ? __pfx_unregister_netdevice_queue (net/core/dev.c:11019) [ 3966.469581][ T71] default_device_exit_batch (net/core/dev.c:11629) [ 3966.469863][ T71] ? __pfx_default_device_exit_batch (net/core/dev.c:11604) [ 3966.470171][ T71] ? mutex_is_locked (./arch/x86/include/asm/atomic64_64.h:15 ./include/linux/atomic/atomic-arch-fallback.h:2569 ./include/linux/atomic/atomic-long.h:38 ./include/linux/atomic/atomic-instrumented.h:3161 kernel/locking/mutex.c:81 kernel/locking/mutex.c:91) [ 3966.470417][ T71] ? nexthop_net_exit_batch_rtnl (net/ipv4/nexthop.c:569 net/ipv4/nexthop.c:1918 net/ipv4/nexthop.c:2426 net/ipv4/nexthop.c:3754) [ 3966.470716][ T71] cleanup_net (net/core/net_namespace.c:636 (discriminator 3)) [ 3966.470946][ T71] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5719) [ 3966.471229][ T71] ? __pfx_cleanup_net (net/core/net_namespace.c:581) [ 3966.471480][ T71] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5725) [ 3966.471723][ T71] ? process_one_work (kernel/workqueue.c:2609) [ 3966.471981][ T71] process_one_work (kernel/workqueue.c:2633) [ 3966.472237][ T71] ? 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) [ 3966.472468][ T71] ? __pfx_process_one_work (kernel/workqueue.c:2542) [ 3966.472739][ T71] ? assign_work (kernel/workqueue.c:1101) [ 3966.472977][ T71] worker_thread (kernel/workqueue.c:2700 kernel/workqueue.c:2787) [ 3966.473213][ T71] ? lockdep_hardirqs_on_prepare.part.0 (kernel/locking/lockdep.c:4300 kernel/locking/lockdep.c:4359) [ 3966.473556][ T71] ? __pfx_worker_thread (kernel/workqueue.c:2733) [ 3966.473814][ T71] ? __pfx_worker_thread (kernel/workqueue.c:2733) [ 3966.474071][ T71] kthread (kernel/kthread.c:388) [ 3966.474279][ T71] ? __pfx_kthread (kernel/kthread.c:341) [ 3966.474511][ T71] ret_from_fork (arch/x86/kernel/process.c:147) [ 3966.474742][ T71] ? __pfx_kthread (kernel/kthread.c:341) Finger prints: dump_stack_lvl:print_report:kasan_report:vxlan_netdevice_event vxlan_netdevice_event:notifier_call_chain:unregister_netdevice_many_notify:default_device_exit_batch