====================================== | [ 81.225306] ------------[ cut here ]------------ | [ 81.225589] refcount_t: underflow; use-after-free. | [ 81.225873] WARNING: CPU: 0 PID: 68 at lib/refcount.c:28 refcount_warn_saturate (lib/refcount.c:28 (discriminator 3)) | [ 81.226321] Modules linked in: macvlan vxlan ip6_udp_tunnel udp_tunnel act_mirred cls_flower ip6_gre ip6_tunnel tunnel6 act_gact cls_matchall ip_gre gre sch_ingress bridge stp llc 8021q vrf veth [ 81.227901] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014 [ 81.228793] Workqueue: netns cleanup_net [ 81.229117] RIP: 0010:refcount_warn_saturate (lib/refcount.c:28 (discriminator 3)) [ 81.229547] 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 cf b6 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 cf b6 mov $0xffffffffb6cf70a0,%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 [ 81.230990] RSP: 0018:ffffb44b00263d78 EFLAGS: 00010286 [ 81.231417] RAX: 0000000000000000 RBX: ffff8c4484908000 RCX: 00000000ffffdfff [ 81.231971] RDX: 0000000000000000 RSI: 00000000ffffffea RDI: 0000000000000001 [ 81.232543] RBP: ffff8c44849085f8 R08: ffffffffb7164508 R09: 00000000ffffdfff [ 81.233115] R10: ffffffffb7084520 R11: ffffffffb7134520 R12: ffff8c4484908000 [ 81.233693] R13: ffffb44b00263e08 R14: ffff8c4484908b60 R15: ffffffffb8613dd0 [ 81.234261] FS: 0000000000000000(0000) GS:ffff8c44bfc00000(0000) knlGS:0000000000000000 [ 81.234909] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 81.235365] CR2: 000000000044a3a0 CR3: 0000000005b04003 CR4: 00000000001706f0 [ 81.235941] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 81.236521] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 81.237077] Call Trace: [ 81.237283] [ 81.237477] ? __warn (kernel/panic.c:677) [ 81.237754] ? refcount_warn_saturate (lib/refcount.c:28 (discriminator 3)) [ 81.238132] ? report_bug (lib/bug.c:201 lib/bug.c:219) [ 81.238452] ? handle_bug (arch/x86/kernel/traps.c:238) [ 81.238740] ? exc_invalid_op (arch/x86/kernel/traps.c:259 (discriminator 1)) [ 81.239048] ? asm_exc_invalid_op (./arch/x86/include/asm/idtentry.h:568) [ 81.239402] ? refcount_warn_saturate (lib/refcount.c:28 (discriminator 3)) [ 81.239780] ? refcount_warn_saturate (lib/refcount.c:28 (discriminator 3)) [ 81.240158] br_sysfs_delbr (net/bridge/br_sysfs_br.c:1086) bridge [ 81.240606] br_dev_delete (net/bridge/br_if.c:396) bridge [ 81.240993] br_net_exit_batch_rtnl (net/bridge/br.c:369) bridge [ 81.241433] cleanup_net (net/core/net_namespace.c:628 (discriminator 2)) [ 81.241734] ? process_one_work (kernel/workqueue.c:2606) [ 81.242071] process_one_work (kernel/workqueue.c:2638) [ 81.242417] worker_thread (kernel/workqueue.c:2700 kernel/workqueue.c:2787) [ 81.242728] ? __pfx_worker_thread (kernel/workqueue.c:2733) [ 81.243085] kthread (kernel/kthread.c:388) [ 81.243347] ? __pfx_kthread (kernel/kthread.c:341) [ 81.243668] ret_from_fork (arch/x86/kernel/process.c:153) [ 81.243966] ? __pfx_kthread (kernel/kthread.c:341) [ 81.244271] ret_from_fork_asm (arch/x86/entry/entry_64.S:250) | [ 81.248263] ------------[ cut here ]------------ | [ 81.248557] sysfs group 'bridge' not found for kobject 'br1' | [ 81.248886] WARNING: CPU: 2 PID: 68 at fs/sysfs/group.c:282 sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) | [ 81.249331] Modules linked in: macvlan vxlan ip6_udp_tunnel udp_tunnel act_mirred cls_flower ip6_gre ip6_tunnel tunnel6 act_gact cls_matchall ip_gre gre sch_ingress bridge stp llc 8021q vrf veth [ 81.250840] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014 [ 81.251488] Workqueue: netns cleanup_net [ 81.251725] RIP: 0010:sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) [ 81.252008] 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 cf b6 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 cf b6 mov $0xffffffffb6cf0688,%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) ... [ 81.253049] RSP: 0018:ffffb44b00263d70 EFLAGS: 00010286 [ 81.253362] RAX: 0000000000000000 RBX: ffffffffc0558c60 RCX: 00000000ffffdfff [ 81.253777] RDX: 0000000000000000 RSI: 00000000ffffffea RDI: 0000000000000001 [ 81.254192] RBP: 0000000000000000 R08: ffffffffb7164508 R09: 00000000ffffdfff [ 81.254601] R10: ffffffffb7084520 R11: ffffffffb7134520 R12: ffff8c44849085f8 [ 81.255002] R13: ffffb44b00263e08 R14: ffff8c4484908b60 R15: ffffffffb8613dd0 [ 81.255421] FS: 0000000000000000(0000) GS:ffff8c44bfd00000(0000) knlGS:0000000000000000 [ 81.255879] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 81.256187] CR2: 00007fb7528ee1b4 CR3: 000000003dc4c005 CR4: 00000000001706f0 [ 81.256570] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 81.256957] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 81.257344] Call Trace: [ 81.257492] [ 81.257621] ? __warn (kernel/panic.c:677) [ 81.257807] ? sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) [ 81.258040] ? report_bug (lib/bug.c:201 lib/bug.c:219) [ 81.258263] ? handle_bug (arch/x86/kernel/traps.c:238) [ 81.258474] ? exc_invalid_op (arch/x86/kernel/traps.c:259 (discriminator 1)) [ 81.258700] ? asm_exc_invalid_op (./arch/x86/include/asm/idtentry.h:568) [ 81.258933] ? sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) [ 81.259180] br_dev_delete (net/bridge/br_if.c:396) bridge [ 81.259466] br_net_exit_batch_rtnl (net/bridge/br.c:369) bridge [ 81.259774] cleanup_net (net/core/net_namespace.c:628 (discriminator 2)) [ 81.259990] ? process_one_work (kernel/workqueue.c:2606) [ 81.260233] process_one_work (kernel/workqueue.c:2638) [ 81.260475] worker_thread (kernel/workqueue.c:2700 kernel/workqueue.c:2787) [ 81.260697] ? __pfx_worker_thread (kernel/workqueue.c:2733) [ 81.260965] kthread (kernel/kthread.c:388) [ 81.261152] ? __pfx_kthread (kernel/kthread.c:341) [ 81.261382] ret_from_fork (arch/x86/kernel/process.c:153) [ 81.261596] ? __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