====================================== | [ 62.806516][ T71] ================================================================== | [ 62.806945][ 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 | [ 62.807413][ T71] Read of size 8 at addr ffff888009f20bd0 by task kworker/u8:1/71 | [ 62.807815][ T71] [ 62.808397][ T71] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014 [ 62.809036][ T71] Workqueue: netns cleanup_net [ 62.809288][ T71] Call Trace: [ 62.809457][ T71] [ 62.809622][ T71] dump_stack_lvl (lib/dump_stack.c:107) [ 62.809861][ T71] print_address_description.constprop.0 (mm/kasan/report.c:378) [ 62.810221][ T71] ? vxlan_netdevice_event (drivers/net/vxlan/vxlan_core.c:4613 drivers/net/vxlan/vxlan_core.c:4636) vxlan [ 62.810593][ T71] print_report (mm/kasan/report.c:489) [ 62.810817][ 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) [ 62.811103][ T71] kasan_report (mm/kasan/report.c:603) [ 62.811335][ T71] ? vxlan_netdevice_event (drivers/net/vxlan/vxlan_core.c:4613 drivers/net/vxlan/vxlan_core.c:4636) vxlan [ 62.811674][ T71] vxlan_netdevice_event (drivers/net/vxlan/vxlan_core.c:4613 drivers/net/vxlan/vxlan_core.c:4636) vxlan [ 62.812019][ T71] ? __pfx_vlan_device_event (net/8021q/vlan.c:362) 8021q [ 62.812381][ T71] ? __pfx_vxlan_netdevice_event (drivers/net/vxlan/vxlan_core.c:4631) vxlan [ 62.812719][ T71] ? netconsole_netdev_event (drivers/net/netconsole.c:991) [ 62.813042][ T71] notifier_call_chain (kernel/notifier.c:93) [ 62.813322][ T71] unregister_netdevice_many_notify (net/core/dev.c:11095) [ 62.813648][ 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) [ 62.813929][ T71] ? __pfx_unregister_netdevice_many_notify (net/core/dev.c:11035) [ 62.814294][ T71] ? vrf_dellink (drivers/net/vrf.c:1708) vrf [ 62.814613][ T71] ? __pfx_unregister_netdevice_queue (net/core/dev.c:11019) [ 62.815046][ T71] default_device_exit_batch (net/core/dev.c:11629) [ 62.815330][ T71] ? __pfx_default_device_exit_batch (net/core/dev.c:11604) [ 62.815674][ 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) [ 62.815958][ 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) [ 62.816294][ T71] cleanup_net (net/core/net_namespace.c:636 (discriminator 3)) [ 62.816519][ T71] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5719) [ 62.816802][ T71] ? __pfx_cleanup_net (net/core/net_namespace.c:581) [ 62.817087][ T71] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5725) [ 62.817339][ T71] ? process_one_work (kernel/workqueue.c:2609) [ 62.817612][ T71] process_one_work (kernel/workqueue.c:2633) [ 62.817894][ 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) [ 62.818147][ T71] ? __pfx_process_one_work (kernel/workqueue.c:2542) [ 62.818471][ T71] ? assign_work (kernel/workqueue.c:1101) [ 62.818734][ T71] worker_thread (kernel/workqueue.c:2700 kernel/workqueue.c:2787) [ 62.819015][ T71] ? lockdep_hardirqs_on_prepare.part.0 (kernel/locking/lockdep.c:4300 kernel/locking/lockdep.c:4359) [ 62.819386][ T71] ? __pfx_worker_thread (kernel/workqueue.c:2733) [ 62.819698][ T71] ? __pfx_worker_thread (kernel/workqueue.c:2733) [ 62.819981][ T71] kthread (kernel/kthread.c:388) [ 62.820189][ T71] ? __pfx_kthread (kernel/kthread.c:341) [ 62.820450][ T71] ret_from_fork (arch/x86/kernel/process.c:147) [ 62.820686][ T71] ? __pfx_kthread (kernel/kthread.c:341) [ 62.820916][ T71] ret_from_fork_asm (arch/x86/entry/entry_64.S:250) | [ 62.840871][ T71] ================================================================== | [ 62.841744][ T71] Disabling lock debugging due to kernel taint | [ 62.842099][ T71] general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] PREEMPT SMP KASAN NOPTI | [ 62.842780][ T71] KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007] [ 62.843723][ T71] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014 [ 62.844367][ T71] Workqueue: netns cleanup_net [ 62.844613][ T71] RIP: 0010:vxlan_netdevice_event (drivers/net/vxlan/vxlan_core.c:4613 drivers/net/vxlan/vxlan_core.c:4636) vxlan [ 62.844993][ 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 [ 62.846013][ T71] RSP: 0018:ffffc9000051f980 EFLAGS: 00010246 [ 62.846336][ T71] RAX: 0000000000000000 RBX: ffffffffffffffd0 RCX: dffffc0000000000 [ 62.846778][ T71] RDX: 0000000000000000 RSI: 0000000000000004 RDI: ffff888009f20c24 [ 62.847223][ T71] RBP: 1ffff920000a3f33 R08: 1ffff1100131781a R09: ffffc9000051f9b8 [ 62.847643][ T71] R10: ffffffffb013ca07 R11: 205d313754202020 R12: ffffed100131781a [ 62.848063][ T71] R13: ffff888009f20ba0 R14: ffff8880072c1000 R15: ffff8880098bc000 [ 62.848456][ T71] FS: 0000000000000000(0000) GS:ffff888035a00000(0000) knlGS:0000000000000000 [ 62.848897][ T71] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 62.849224][ T71] CR2: 000056399ab87dec CR3: 0000000007f2a006 CR4: 0000000000770ef0 [ 62.849621][ T71] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 62.850014][ T71] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 62.850407][ T71] PKRU: 55555554 [ 62.850587][ T71] Call Trace: [ 62.850755][ T71] [ 62.850903][ T71] ? die_addr (arch/x86/kernel/dumpstack.c:421 arch/x86/kernel/dumpstack.c:460) [ 62.851115][ T71] ? exc_general_protection (arch/x86/kernel/traps.c:701 arch/x86/kernel/traps.c:643) [ 62.851397][ T71] ? asm_exc_general_protection (./arch/x86/include/asm/idtentry.h:564) [ 62.851686][ T71] ? vxlan_netdevice_event (drivers/net/vxlan/vxlan_core.c:4613 drivers/net/vxlan/vxlan_core.c:4636) vxlan [ 62.852006][ T71] ? __pfx_vxlan_netdevice_event (drivers/net/vxlan/vxlan_core.c:4631) vxlan [ 62.852342][ T71] ? netconsole_netdev_event (drivers/net/netconsole.c:991) [ 62.852628][ T71] notifier_call_chain (kernel/notifier.c:93) [ 62.852885][ T71] unregister_netdevice_many_notify (net/core/dev.c:11095) [ 62.853240][ 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) [ 62.853482][ T71] ? __pfx_unregister_netdevice_many_notify (net/core/dev.c:11035) [ 62.853823][ T71] ? vrf_dellink (drivers/net/vrf.c:1708) vrf [ 62.854106][ T71] ? __pfx_unregister_netdevice_queue (net/core/dev.c:11019) [ 62.854452][ T71] default_device_exit_batch (net/core/dev.c:11629) [ 62.854750][ T71] ? __pfx_default_device_exit_batch (net/core/dev.c:11604) [ 62.855078][ 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) [ 62.855342][ 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) [ 62.855654][ T71] cleanup_net (net/core/net_namespace.c:636 (discriminator 3)) [ 62.855905][ T71] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5719) [ 62.856213][ T71] ? __pfx_cleanup_net (net/core/net_namespace.c:581) [ 62.856496][ T71] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5725) [ 62.856746][ T71] ? process_one_work (kernel/workqueue.c:2609) [ 62.857015][ T71] process_one_work (kernel/workqueue.c:2633) [ 62.857299][ 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) [ 62.857529][ T71] ? __pfx_process_one_work (kernel/workqueue.c:2542) [ 62.857798][ T71] ? assign_work (kernel/workqueue.c:1101) [ 62.858057][ T71] worker_thread (kernel/workqueue.c:2700 kernel/workqueue.c:2787) [ 62.858319][ T71] ? lockdep_hardirqs_on_prepare.part.0 (kernel/locking/lockdep.c:4300 kernel/locking/lockdep.c:4359) [ 62.858678][ T71] ? __pfx_worker_thread (kernel/workqueue.c:2733) [ 62.858953][ T71] ? __pfx_worker_thread (kernel/workqueue.c:2733) [ 62.859219][ T71] kthread (kernel/kthread.c:388) [ 62.859448][ T71] ? __pfx_kthread (kernel/kthread.c:341) [ 62.859716][ T71] ret_from_fork (arch/x86/kernel/process.c:147) [ 62.859942][ 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