====================================== | [ 170.871734] ------------[ cut here ]------------ | [ 170.872025] refcount_t: underflow; use-after-free. | [ 170.872316] WARNING: CPU: 0 PID: 11 at lib/refcount.c:28 refcount_warn_saturate (lib/refcount.c:28 (discriminator 3)) | [ 170.872761] Modules linked in: macvlan 8021q vxlan ip6_udp_tunnel udp_tunnel dummy act_mirred cls_flower bridge stp llc ip6_gre ip6_tunnel tunnel6 act_gact cls_matchall ip_gre gre sch_ingress vrf veth [ 170.874149] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014 [ 170.874769] Workqueue: netns cleanup_net [ 170.874998] RIP: 0010:refcount_warn_saturate (lib/refcount.c:28 (discriminator 3)) [ 170.875288] 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 ac 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 ac mov $0xffffffffac8f70a0,%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 [ 170.876267] RSP: 0018:ffffa9ea40063d78 EFLAGS: 00010286 [ 170.876554] RAX: 0000000000000000 RBX: ffff89e0c3f6a000 RCX: 00000000ffffdfff [ 170.876943] RDX: 0000000000000000 RSI: 00000000ffffffea RDI: 0000000000000001 [ 170.877333] RBP: ffff89e0c3f6a5f8 R08: ffffffffacd64508 R09: 00000000ffffdfff [ 170.877709] R10: ffffffffacc84520 R11: ffffffffacd34520 R12: ffff89e0c3f6a000 [ 170.878104] R13: ffffa9ea40063e08 R14: ffff89e0c3f6ab60 R15: ffffffffae213dd0 [ 170.878481] FS: 0000000000000000(0000) GS:ffff89e0fec00000(0000) knlGS:0000000000000000 [ 170.878923] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 170.879243] CR2: 00005561d509ceb8 CR3: 0000000009a4c001 CR4: 00000000001706f0 [ 170.879621] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 170.880004] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 170.880387] Call Trace: [ 170.880528] <TASK> [ 170.880655] ? __warn (kernel/panic.c:677) [ 170.880855] ? refcount_warn_saturate (lib/refcount.c:28 (discriminator 3)) [ 170.881108] ? report_bug (lib/bug.c:201 lib/bug.c:219) [ 170.881319] ? handle_bug (arch/x86/kernel/traps.c:238) [ 170.881517] ? exc_invalid_op (arch/x86/kernel/traps.c:259 (discriminator 1)) [ 170.881731] ? asm_exc_invalid_op (./arch/x86/include/asm/idtentry.h:568) [ 170.881974] ? refcount_warn_saturate (lib/refcount.c:28 (discriminator 3)) [ 170.882230] ? refcount_warn_saturate (lib/refcount.c:28 (discriminator 3)) [ 170.882482] br_sysfs_delbr (net/bridge/br_sysfs_br.c:1086) bridge [ 170.882786] br_dev_delete (net/bridge/br_if.c:396) bridge [ 170.883049] br_net_exit_batch_rtnl (net/bridge/br.c:369) bridge [ 170.883356] cleanup_net (net/core/net_namespace.c:628 (discriminator 2)) [ 170.883559] ? process_one_work (kernel/workqueue.c:2606) [ 170.883790] process_one_work (kernel/workqueue.c:2638) [ 170.884021] worker_thread (kernel/workqueue.c:2700 kernel/workqueue.c:2787) [ 170.884230] ? __pfx_worker_thread (kernel/workqueue.c:2733) [ 170.884464] kthread (kernel/kthread.c:388) [ 170.884646] ? __pfx_kthread (kernel/kthread.c:341) [ 170.884862] ret_from_fork (arch/x86/kernel/process.c:153) [ 170.885063] ? __pfx_kthread (kernel/kthread.c:341) [ 170.885273] ret_from_fork_asm (arch/x86/entry/entry_64.S:250) | [ 170.888232] ------------[ cut here ]------------ | [ 170.888623] sysfs group 'bridge' not found for kobject 'br1' | [ 170.889109] WARNING: CPU: 2 PID: 11 at fs/sysfs/group.c:282 sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) | [ 170.889752] Modules linked in: macvlan 8021q vxlan ip6_udp_tunnel udp_tunnel dummy act_mirred cls_flower bridge stp llc ip6_gre ip6_tunnel tunnel6 act_gact cls_matchall ip_gre gre sch_ingress vrf veth [ 170.891879] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014 [ 170.892771] Workqueue: netns cleanup_net [ 170.893108] RIP: 0010:sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) [ 170.893500] 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 ac 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 ac mov $0xffffffffac8f0688,%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) ... [ 170.894965] RSP: 0018:ffffa9ea40063d70 EFLAGS: 00010286 [ 170.895376] RAX: 0000000000000000 RBX: ffffffffc02e9c60 RCX: 00000000ffffdfff [ 170.895948] RDX: 0000000000000000 RSI: 00000000ffffffea RDI: 0000000000000001 [ 170.896335] RBP: 0000000000000000 R08: ffffffffacd64508 R09: 00000000ffffdfff [ 170.896719] R10: ffffffffacc84520 R11: ffffffffacd34520 R12: ffff89e0c3f6a5f8 [ 170.897120] R13: ffffa9ea40063e08 R14: ffff89e0c3f6ab60 R15: ffffffffae213dd0 [ 170.897525] FS: 0000000000000000(0000) GS:ffff89e0fed00000(0000) knlGS:0000000000000000 [ 170.897961] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 170.898279] CR2: 00007fcd475111b4 CR3: 0000000009a4c001 CR4: 00000000001706f0 [ 170.898656] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 170.899047] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 170.899435] Call Trace: [ 170.899573] <TASK> [ 170.899700] ? __warn (kernel/panic.c:677) [ 170.899891] ? sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) [ 170.900139] ? report_bug (lib/bug.c:201 lib/bug.c:219) [ 170.900344] ? handle_bug (arch/x86/kernel/traps.c:238) [ 170.900537] ? exc_invalid_op (arch/x86/kernel/traps.c:259 (discriminator 1)) [ 170.900927] ? asm_exc_invalid_op (./arch/x86/include/asm/idtentry.h:568) [ 170.901184] ? sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) [ 170.901426] br_dev_delete (net/bridge/br_if.c:396) bridge [ 170.901700] br_net_exit_batch_rtnl (net/bridge/br.c:369) bridge [ 170.902001] cleanup_net (net/core/net_namespace.c:628 (discriminator 2)) [ 170.902210] ? process_one_work (kernel/workqueue.c:2606) [ 170.902442] process_one_work (kernel/workqueue.c:2638) [ 170.902668] worker_thread (kernel/workqueue.c:2700 kernel/workqueue.c:2787) [ 170.902886] ? __pfx_worker_thread (kernel/workqueue.c:2733) [ 170.903131] kthread (kernel/kthread.c:388) [ 170.903304] ? __pfx_kthread (kernel/kthread.c:341) [ 170.903509] ret_from_fork (arch/x86/kernel/process.c:153) [ 170.903711] ? __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