====================================== | [ 15.230855] ------------[ cut here ]------------ | [ 15.231122] refcount_t: underflow; use-after-free. | [ 15.231401] WARNING: CPU: 2 PID: 68 at lib/refcount.c:28 refcount_warn_saturate (lib/refcount.c:28 (discriminator 3)) | [ 15.231859] Modules linked in: macvlan 8021q vxlan ip6_udp_tunnel udp_tunnel bridge stp llc vrf veth [ 15.232758] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014 [ 15.233373] Workqueue: netns cleanup_net [ 15.233593] RIP: 0010:refcount_warn_saturate (lib/refcount.c:28 (discriminator 3)) [ 15.233888] Code: 0b 90 90 c3 cc cc cc cc 80 3d a1 b9 66 01 00 0f 85 75 ff ff ff c6 05 94 b9 66 01 01 90 48 c7 c7 a0 70 2f 8e e8 71 92 b4 ff 90 <0f> 0b 90 90 c3 cc cc cc cc 80 3d 74 b9 66 01 00 0f 85 4a ff ff ff All code ======== 0: 0b 90 90 c3 cc cc or -0x33333c70(%rax),%edx 6: cc int3 7: cc int3 8: 80 3d a1 b9 66 01 00 cmpb $0x0,0x166b9a1(%rip) # 0x166b9b0 f: 0f 85 75 ff ff ff jne 0xffffffffffffff8a 15: c6 05 94 b9 66 01 01 movb $0x1,0x166b994(%rip) # 0x166b9b0 1c: 90 nop 1d: 48 c7 c7 a0 70 2f 8e mov $0xffffffff8e2f70a0,%rdi 24: e8 71 92 b4 ff call 0xffffffffffb4929a 29: 90 nop 2a:* 0f 0b ud2 <-- trapping instruction 2c: 90 nop 2d: 90 nop 2e: c3 ret 2f: cc int3 30: cc int3 31: cc int3 32: cc int3 33: 80 3d 74 b9 66 01 00 cmpb $0x0,0x166b974(%rip) # 0x166b9ae 3a: 0f 85 4a ff ff ff jne 0xffffffffffffff8a Code starting with the faulting instruction =========================================== 0: 0f 0b ud2 2: 90 nop 3: 90 nop 4: c3 ret 5: cc int3 6: cc int3 7: cc int3 8: cc int3 9: 80 3d 74 b9 66 01 00 cmpb $0x0,0x166b974(%rip) # 0x166b984 10: 0f 85 4a ff ff ff jne 0xffffffffffffff60 [ 15.234878] RSP: 0018:ffff989d80263d78 EFLAGS: 00010286 [ 15.235162] RAX: 0000000000000000 RBX: ffff8a2682f2a000 RCX: 00000000ffffdfff [ 15.235544] RDX: 0000000000000000 RSI: 00000000ffffffea RDI: 0000000000000001 [ 15.235934] RBP: ffff8a2682f2a5f8 R08: ffffffff8e764508 R09: 00000000ffffdfff [ 15.236318] R10: ffffffff8e684520 R11: ffffffff8e734520 R12: ffff8a2682f2a000 [ 15.236701] R13: ffff989d80263e08 R14: ffff8a2682f2ab60 R15: ffffffff8fc13dd0 [ 15.237091] FS: 0000000000000000(0000) GS:ffff8a26bed00000(0000) knlGS:0000000000000000 [ 15.237517] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 15.237836] CR2: 00007fff52461ec0 CR3: 0000000008454004 CR4: 00000000001706f0 [ 15.238217] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 15.238601] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 15.238989] Call Trace: [ 15.239127] [ 15.239253] ? __warn (kernel/panic.c:677) [ 15.239438] ? refcount_warn_saturate (lib/refcount.c:28 (discriminator 3)) [ 15.239693] ? report_bug (lib/bug.c:201 lib/bug.c:219) [ 15.239907] ? handle_bug (arch/x86/kernel/traps.c:238) [ 15.240106] ? exc_invalid_op (arch/x86/kernel/traps.c:259 (discriminator 1)) [ 15.240316] ? asm_exc_invalid_op (./arch/x86/include/asm/idtentry.h:568) [ 15.240551] ? refcount_warn_saturate (lib/refcount.c:28 (discriminator 3)) [ 15.240807] ? refcount_warn_saturate (lib/refcount.c:28 (discriminator 3)) [ 15.241064] br_sysfs_delbr (net/bridge/br_sysfs_br.c:1086) bridge [ 15.241360] br_dev_delete (net/bridge/br_if.c:396) bridge [ 15.241614] br_net_exit_batch_rtnl (net/bridge/br.c:369) bridge [ 15.241915] cleanup_net (net/core/net_namespace.c:628 (discriminator 2)) [ 15.242116] ? process_one_work (kernel/workqueue.c:2606) [ 15.242348] process_one_work (kernel/workqueue.c:2638) [ 15.242574] worker_thread (kernel/workqueue.c:2700 kernel/workqueue.c:2787) [ 15.242954] ? __pfx_worker_thread (kernel/workqueue.c:2733) [ 15.243199] kthread (kernel/kthread.c:388) [ 15.243372] ? __pfx_kthread (kernel/kthread.c:341) [ 15.243576] ret_from_fork (arch/x86/kernel/process.c:153) [ 15.243777] ? __pfx_kthread (kernel/kthread.c:341) [ 15.244002] ret_from_fork_asm (arch/x86/entry/entry_64.S:250) | [ 15.246674] ------------[ cut here ]------------ | [ 15.246946] sysfs group 'bridge' not found for kobject 'br1' | [ 15.247265] WARNING: CPU: 2 PID: 68 at fs/sysfs/group.c:282 sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) | [ 15.247696] Modules linked in: macvlan 8021q vxlan ip6_udp_tunnel udp_tunnel bridge stp llc vrf veth [ 15.248710] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014 [ 15.249322] Workqueue: netns cleanup_net [ 15.249542] RIP: 0010:sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) [ 15.249800] Code: 48 89 ef 5d 41 5c e9 0a ae ff ff 48 89 ef e8 a2 9b ff ff eb d1 90 49 8b 14 24 48 8b 33 48 c7 c7 88 06 2f 8e e8 fc b0 c5 ff 90 <0f> 0b 90 90 5b 5d 41 5c c3 cc cc cc cc 66 66 2e 0f 1f 84 00 00 00 All code ======== 0: 48 89 ef mov %rbp,%rdi 3: 5d pop %rbp 4: 41 5c pop %r12 6: e9 0a ae ff ff jmp 0xffffffffffffae15 b: 48 89 ef mov %rbp,%rdi e: e8 a2 9b ff ff call 0xffffffffffff9bb5 13: eb d1 jmp 0xffffffffffffffe6 15: 90 nop 16: 49 8b 14 24 mov (%r12),%rdx 1a: 48 8b 33 mov (%rbx),%rsi 1d: 48 c7 c7 88 06 2f 8e mov $0xffffffff8e2f0688,%rdi 24: e8 fc b0 c5 ff call 0xffffffffffc5b125 29: 90 nop 2a:* 0f 0b ud2 <-- trapping instruction 2c: 90 nop 2d: 90 nop 2e: 5b pop %rbx 2f: 5d pop %rbp 30: 41 5c pop %r12 32: c3 ret 33: cc int3 34: cc int3 35: cc int3 36: cc int3 37: 66 data16 38: 66 data16 39: 2e cs 3a: 0f .byte 0xf 3b: 1f (bad) 3c: 84 00 test %al,(%rax) ... Code starting with the faulting instruction =========================================== 0: 0f 0b ud2 2: 90 nop 3: 90 nop 4: 5b pop %rbx 5: 5d pop %rbp 6: 41 5c pop %r12 8: c3 ret 9: cc int3 a: cc int3 b: cc int3 c: cc int3 d: 66 data16 e: 66 data16 f: 2e cs 10: 0f .byte 0xf 11: 1f (bad) 12: 84 00 test %al,(%rax) ... [ 15.250768] RSP: 0018:ffff989d80263d70 EFLAGS: 00010286 [ 15.251058] RAX: 0000000000000000 RBX: ffffffffc056cc60 RCX: 00000000ffffdfff [ 15.251435] RDX: 0000000000000000 RSI: 00000000ffffffea RDI: 0000000000000001 [ 15.251814] RBP: 0000000000000000 R08: ffffffff8e764508 R09: 00000000ffffdfff [ 15.252196] R10: ffffffff8e684520 R11: ffffffff8e734520 R12: ffff8a2682f2a5f8 [ 15.252577] R13: ffff989d80263e08 R14: ffff8a2682f2ab60 R15: ffffffff8fc13dd0 [ 15.252974] FS: 0000000000000000(0000) GS:ffff8a26bed00000(0000) knlGS:0000000000000000 [ 15.253404] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 15.253710] CR2: 00007fff52461ec0 CR3: 0000000008454004 CR4: 00000000001706f0 [ 15.254096] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 15.254472] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 15.254856] Call Trace: [ 15.254996] [ 15.255117] ? __warn (kernel/panic.c:677) [ 15.255295] ? sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) [ 15.255526] ? report_bug (lib/bug.c:201 lib/bug.c:219) [ 15.255731] ? handle_bug (arch/x86/kernel/traps.c:238) [ 15.255934] ? exc_invalid_op (arch/x86/kernel/traps.c:259 (discriminator 1)) [ 15.256150] ? asm_exc_invalid_op (./arch/x86/include/asm/idtentry.h:568) [ 15.256383] ? sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) [ 15.256616] br_dev_delete (net/bridge/br_if.c:396) bridge [ 15.256882] br_net_exit_batch_rtnl (net/bridge/br.c:369) bridge [ 15.257172] cleanup_net (net/core/net_namespace.c:628 (discriminator 2)) [ 15.257372] ? process_one_work (kernel/workqueue.c:2606) [ 15.257606] process_one_work (kernel/workqueue.c:2638) [ 15.257840] worker_thread (kernel/workqueue.c:2700 kernel/workqueue.c:2787) [ 15.258051] ? __pfx_worker_thread (kernel/workqueue.c:2733) [ 15.258283] kthread (kernel/kthread.c:388) [ 15.258461] ? __pfx_kthread (kernel/kthread.c:341) [ 15.258671] ret_from_fork (arch/x86/kernel/process.c:153) [ 15.258877] ? __pfx_kthread (kernel/kthread.c:341) Finger prints: refcount_warn_saturate:br_sysfs_delbr:br_dev_delete:br_net_exit_batch_rtnl sysfs_remove_group:br_dev_delete:br_net_exit_batch_rtnl:cleanup_net