====================================== | [ 23.511221] ------------[ cut here ]------------ | [ 23.511542] refcount_t: underflow; use-after-free. | [ 23.511895] WARNING: CPU: 0 PID: 70 at lib/refcount.c:28 refcount_warn_saturate (lib/refcount.c:28 (discriminator 3)) | [ 23.512404] Modules linked in: vxlan ip6_udp_tunnel udp_tunnel bridge stp llc act_gact cls_flower sch_ingress ip6_gre ip6_tunnel tunnel6 gre 8021q vrf veth [ 23.513714] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014 [ 23.514496] Workqueue: netns cleanup_net [ 23.514794] RIP: 0010:refcount_warn_saturate (lib/refcount.c:28 (discriminator 3)) [ 23.515136] 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 8f a8 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 8f a8 mov $0xffffffffa88f70a0,%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 [ 23.516238] RSP: 0018:ffffa41940273d78 EFLAGS: 00010286 [ 23.516574] RAX: 0000000000000000 RBX: ffff9631c233e000 RCX: 00000000ffffdfff [ 23.517030] RDX: 0000000000000000 RSI: 00000000ffffffea RDI: 0000000000000001 [ 23.517529] RBP: ffff9631c233e5f8 R08: ffffffffa8d64508 R09: 00000000ffffdfff [ 23.517993] R10: ffffffffa8c84520 R11: ffffffffa8d34520 R12: ffff9631c233e000 [ 23.518434] R13: ffffa41940273e08 R14: ffff9631c233eb60 R15: ffff9631c59d8050 [ 23.518839] FS: 0000000000000000(0000) GS:ffff9631fec00000(0000) knlGS:0000000000000000 [ 23.519283] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 23.519599] CR2: 00007fd4cfdcf270 CR3: 00000000039b8004 CR4: 00000000001706f0 [ 23.520017] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 23.520450] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 23.520881] Call Trace: [ 23.521055] [ 23.521211] ? __warn (kernel/panic.c:677) [ 23.521438] ? refcount_warn_saturate (lib/refcount.c:28 (discriminator 3)) [ 23.521728] ? report_bug (lib/bug.c:201 lib/bug.c:219) [ 23.521972] ? handle_bug (arch/x86/kernel/traps.c:238) [ 23.522190] ? exc_invalid_op (arch/x86/kernel/traps.c:259 (discriminator 1)) [ 23.522436] ? asm_exc_invalid_op (./arch/x86/include/asm/idtentry.h:568) [ 23.522700] ? refcount_warn_saturate (lib/refcount.c:28 (discriminator 3)) [ 23.522994] ? refcount_warn_saturate (lib/refcount.c:28 (discriminator 3)) [ 23.523283] br_sysfs_delbr (net/bridge/br_sysfs_br.c:1086) bridge [ 23.523621] br_dev_delete (net/bridge/br_if.c:396) bridge [ 23.523900] br_net_exit_batch_rtnl (net/bridge/br.c:369) bridge [ 23.524227] cleanup_net (net/core/net_namespace.c:628 (discriminator 2)) [ 23.524473] ? process_one_work (kernel/workqueue.c:2606) [ 23.524739] process_one_work (kernel/workqueue.c:2638) [ 23.525015] worker_thread (kernel/workqueue.c:2700 kernel/workqueue.c:2787) [ 23.525246] ? __pfx_worker_thread (kernel/workqueue.c:2733) [ 23.525510] kthread (kernel/kthread.c:388) [ 23.525725] ? __pfx_kthread (kernel/kthread.c:341) [ 23.525989] ret_from_fork (arch/x86/kernel/process.c:153) [ 23.526217] ? __pfx_kthread (kernel/kthread.c:341) [ 23.526426] ret_from_fork_asm (arch/x86/entry/entry_64.S:250) | [ 23.529070] ------------[ cut here ]------------ | [ 23.529324] sysfs group 'bridge' not found for kobject 'br2' | [ 23.529648] WARNING: CPU: 0 PID: 70 at fs/sysfs/group.c:282 sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) | [ 23.530090] Modules linked in: vxlan ip6_udp_tunnel udp_tunnel bridge stp llc act_gact cls_flower sch_ingress ip6_gre ip6_tunnel tunnel6 gre 8021q vrf veth [ 23.531305] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014 [ 23.531905] Workqueue: netns cleanup_net [ 23.532126] RIP: 0010:sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) [ 23.532390] 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 8f a8 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 8f a8 mov $0xffffffffa88f0688,%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) ... [ 23.533368] RSP: 0018:ffffa41940273d70 EFLAGS: 00010286 [ 23.533672] RAX: 0000000000000000 RBX: ffffffffc0435c60 RCX: 00000000ffffdfff [ 23.534085] RDX: 0000000000000000 RSI: 00000000ffffffea RDI: 0000000000000001 [ 23.534487] RBP: 0000000000000000 R08: ffffffffa8d64508 R09: 00000000ffffdfff [ 23.534884] R10: ffffffffa8c84520 R11: ffffffffa8d34520 R12: ffff9631c233e5f8 [ 23.535292] R13: ffffa41940273e08 R14: ffff9631c233eb60 R15: ffff9631c59d8050 [ 23.535698] FS: 0000000000000000(0000) GS:ffff9631fec00000(0000) knlGS:0000000000000000 [ 23.536170] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 23.536497] CR2: 00007fd4cfdcf270 CR3: 000000001044c002 CR4: 00000000001706f0 [ 23.536907] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 23.537327] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 23.537739] Call Trace: [ 23.537897] [ 23.538036] ? __warn (kernel/panic.c:677) [ 23.538235] ? sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) [ 23.538480] ? report_bug (lib/bug.c:201 lib/bug.c:219) [ 23.538701] ? handle_bug (arch/x86/kernel/traps.c:238) [ 23.538912] ? exc_invalid_op (arch/x86/kernel/traps.c:259 (discriminator 1)) [ 23.539149] ? asm_exc_invalid_op (./arch/x86/include/asm/idtentry.h:568) [ 23.539395] ? sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) [ 23.539646] br_dev_delete (net/bridge/br_if.c:396) bridge [ 23.539922] br_net_exit_batch_rtnl (net/bridge/br.c:369) bridge [ 23.540246] cleanup_net (net/core/net_namespace.c:628 (discriminator 2)) [ 23.540458] ? process_one_work (kernel/workqueue.c:2606) [ 23.540687] process_one_work (kernel/workqueue.c:2638) [ 23.540907] worker_thread (kernel/workqueue.c:2700 kernel/workqueue.c:2787) [ 23.541119] ? __pfx_worker_thread (kernel/workqueue.c:2733) [ 23.541357] kthread (kernel/kthread.c:388) [ 23.541533] ? __pfx_kthread (kernel/kthread.c:341) [ 23.541738] ret_from_fork (arch/x86/kernel/process.c:153) [ 23.541958] ? __pfx_kthread (kernel/kthread.c:341) [ 23.542166] ret_from_fork_asm (arch/x86/entry/entry_64.S:250) | [ 23.648220] ------------[ cut here ]------------ | [ 23.648636] sysfs group 'bridge' not found for kobject 'br2' | [ 23.649143] WARNING: CPU: 0 PID: 70 at fs/sysfs/group.c:282 sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) | [ 23.649797] Modules linked in: vxlan ip6_udp_tunnel udp_tunnel bridge stp llc act_gact cls_flower sch_ingress ip6_gre ip6_tunnel tunnel6 gre 8021q vrf veth [ 23.651663] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014 [ 23.652594] Workqueue: netns cleanup_net [ 23.652944] RIP: 0010:sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) [ 23.653346] 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 8f a8 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 8f a8 mov $0xffffffffa88f0688,%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) ... [ 23.654861] RSP: 0018:ffffa41940273d70 EFLAGS: 00010286 [ 23.655307] RAX: 0000000000000000 RBX: ffffffffc0435c60 RCX: 00000000ffffdfff [ 23.655894] RDX: 0000000000000000 RSI: 00000000ffffffea RDI: 0000000000000001 [ 23.656481] RBP: 0000000000000000 R08: ffffffffa8d64508 R09: 00000000ffffdfff [ 23.657077] R10: ffffffffa8c84520 R11: ffffffffa8d34520 R12: ffff9631c1c6c5f8 [ 23.657666] R13: ffffa41940273e08 R14: ffff9631c1c6cb60 R15: ffffffffaa213dd0 [ 23.658249] FS: 0000000000000000(0000) GS:ffff9631fec00000(0000) knlGS:0000000000000000 [ 23.658894] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 23.659373] CR2: 00005593e8df6dec CR3: 00000000012a8005 CR4: 00000000001706f0 [ 23.659958] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 23.660532] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 23.661128] Call Trace: [ 23.661345] [ 23.661532] ? __warn (kernel/panic.c:677) [ 23.661806] ? sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) [ 23.662165] ? report_bug (lib/bug.c:201 lib/bug.c:219) [ 23.662475] ? handle_bug (arch/x86/kernel/traps.c:238) [ 23.662770] ? exc_invalid_op (arch/x86/kernel/traps.c:259 (discriminator 1)) [ 23.663110] ? asm_exc_invalid_op (./arch/x86/include/asm/idtentry.h:568) [ 23.663472] ? sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) [ 23.663822] br_dev_delete (net/bridge/br_if.c:396) bridge [ 23.664230] br_net_exit_batch_rtnl (net/bridge/br.c:369) bridge [ 23.664688] cleanup_net (net/core/net_namespace.c:628 (discriminator 2)) [ 23.665010] ? process_one_work (kernel/workqueue.c:2606) [ 23.665361] process_one_work (kernel/workqueue.c:2638) [ 23.665702] worker_thread (kernel/workqueue.c:2700 kernel/workqueue.c:2787) [ 23.666029] ? __pfx_worker_thread (kernel/workqueue.c:2733) [ 23.666390] kthread (kernel/kthread.c:388) [ 23.666654] ? __pfx_kthread (kernel/kthread.c:341) [ 23.666983] ret_from_fork (arch/x86/kernel/process.c:153) [ 23.667278] ? __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 sysfs_remove_group:br_dev_delete:br_net_exit_batch_rtnl:cleanup_net