====================================== | [ 1280.850551] ------------[ cut here ]------------ | [ 1280.850923] refcount_t: underflow; use-after-free. | [ 1280.851329] WARNING: CPU: 1 PID: 69 at lib/refcount.c:28 refcount_warn_saturate (lib/refcount.c:28 (discriminator 3)) | [ 1280.851992] Modules linked in: xt_HL amt xfrm_user l2tp_ip6 l2tp_eth l2tp_ip l2tp_netlink l2tp_core nft_compat nf_tables libcrc32c vxlan ip6_udp_tunnel udp_tunnel mpls_iptunnel mpls_router [ 1280.853854] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014 [ 1280.854711] Workqueue: netns cleanup_net [ 1280.855021] RIP: 0010:refcount_warn_saturate (lib/refcount.c:28 (discriminator 3)) [ 1280.855441] Code: 0b 90 90 c3 cc cc cc cc 80 3d 69 d4 67 01 00 0f 85 75 ff ff ff c6 05 5c d4 67 01 01 90 48 c7 c7 b8 37 13 b0 e8 a1 26 b4 ff 90 <0f> 0b 90 90 c3 cc cc cc cc 80 3d 3c d4 67 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 69 d4 67 01 00 cmpb $0x0,0x167d469(%rip) # 0x167d478 f: 0f 85 75 ff ff ff jne 0xffffffffffffff8a 15: c6 05 5c d4 67 01 01 movb $0x1,0x167d45c(%rip) # 0x167d478 1c: 90 nop 1d: 48 c7 c7 b8 37 13 b0 mov $0xffffffffb01337b8,%rdi 24: e8 a1 26 b4 ff call 0xffffffffffb426ca 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 3c d4 67 01 00 cmpb $0x0,0x167d43c(%rip) # 0x167d476 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 3c d4 67 01 00 cmpb $0x0,0x167d43c(%rip) # 0x167d44c 10: 0f 85 4a ff ff ff jne 0xffffffffffffff60 [ 1280.856840] RSP: 0018:ffffb5664026bd78 EFLAGS: 00010286 [ 1280.857255] RAX: 0000000000000000 RBX: ffff97be82b48000 RCX: 00000000ffffdfff [ 1280.857804] RDX: 0000000000000000 RSI: 00000000ffffffea RDI: 0000000000000001 [ 1280.858338] RBP: ffff97be82b48610 R08: ffffffffb0578508 R09: 00000000ffffdfff [ 1280.858771] R10: ffffffffb0498520 R11: ffffffffb0548520 R12: ffff97be82b48000 [ 1280.859166] R13: ffffb5664026be08 R14: ffff97be82b48b80 R15: ffff97be86f32e50 [ 1280.859580] FS: 0000000000000000(0000) GS:ffff97bebec80000(0000) knlGS:0000000000000000 [ 1280.860013] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 1280.860331] CR2: 00007f668decc8e8 CR3: 000000000fc60003 CR4: 0000000000770ef0 [ 1280.860701] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 1280.861086] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 1280.861470] PKRU: 55555554 [ 1280.861614] Call Trace: [ 1280.861748] <TASK> [ 1280.861891] ? __warn (kernel/panic.c:677) [ 1280.862074] ? refcount_warn_saturate (lib/refcount.c:28 (discriminator 3)) [ 1280.862324] ? report_bug (lib/bug.c:201 lib/bug.c:219) [ 1280.862536] ? handle_bug (arch/x86/kernel/traps.c:238) [ 1280.862724] ? exc_invalid_op (arch/x86/kernel/traps.c:259 (discriminator 1)) [ 1280.862941] ? asm_exc_invalid_op (./arch/x86/include/asm/idtentry.h:568) [ 1280.863186] ? refcount_warn_saturate (lib/refcount.c:28 (discriminator 3)) [ 1280.863434] ? refcount_warn_saturate (lib/refcount.c:28 (discriminator 3)) [ 1280.863733] br_sysfs_delbr (net/bridge/br_sysfs_br.c:1086) [ 1280.863947] br_dev_delete (net/bridge/br_if.c:396) [ 1280.864164] br_net_exit_batch_rtnl (net/bridge/br.c:369) [ 1280.864400] cleanup_net (net/core/net_namespace.c:630) [ 1280.864593] ? process_one_work (kernel/workqueue.c:2606) [ 1280.864814] process_one_work (kernel/workqueue.c:2633) [ 1280.865049] worker_thread (kernel/workqueue.c:2700 kernel/workqueue.c:2787) [ 1280.865267] ? __pfx_worker_thread (kernel/workqueue.c:2733) [ 1280.865512] kthread (kernel/kthread.c:388) [ 1280.865682] ? __pfx_kthread (kernel/kthread.c:341) [ 1280.865887] ret_from_fork (arch/x86/kernel/process.c:147) [ 1280.866099] ? __pfx_kthread (kernel/kthread.c:341) [ 1280.866314] ret_from_fork_asm (arch/x86/entry/entry_64.S:250) | [ 1280.869262] sysfs group 'bridge' not found for kobject 'br0' | [ 1280.869569] WARNING: CPU: 1 PID: 69 at fs/sysfs/group.c:282 sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) | [ 1280.869994] Modules linked in: xt_HL amt xfrm_user l2tp_ip6 l2tp_eth l2tp_ip l2tp_netlink l2tp_core nft_compat nf_tables libcrc32c vxlan ip6_udp_tunnel udp_tunnel mpls_iptunnel mpls_router | [ 1280.871416] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014 xx__-> [ 1280.872011] Workqueue: netns cleanup_net [ 1280.872414] RIP: 0010:sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) [ 1280.872677] Code: 48 89 ef 5d 41 5c e9 7a ad ff ff 48 89 ef e8 12 9b ff ff eb d1 90 49 8b 14 24 48 8b 33 48 c7 c7 a0 cd 12 b0 e8 ac 67 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 7a ad ff ff jmp 0xffffffffffffad85 b: 48 89 ef mov %rbp,%rdi e: e8 12 9b ff ff call 0xffffffffffff9b25 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 a0 cd 12 b0 mov $0xffffffffb012cda0,%rdi 24: e8 ac 67 c5 ff call 0xffffffffffc567d5 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) ... xx__-> [ 1280.873616] RSP: 0018:ffffb5664026bd70 EFLAGS: 00010286 [ 1280.873998] RAX: 0000000000000000 RBX: ffffffffafd472c0 RCX: 00000000ffffdfff [ 1280.874370] RDX: 0000000000000000 RSI: 00000000ffffffea RDI: 0000000000000001 [ 1280.874741] RBP: 0000000000000000 R08: ffffffffb0578508 R09: 00000000ffffdfff [ 1280.875116] R10: ffffffffb0498520 R11: ffffffffb0548520 R12: ffff97be82b48610 [ 1280.875482] R13: ffffb5664026be08 R14: ffff97be82b48b80 R15: ffff97be86f32e50 [ 1280.875853] FS: 0000000000000000(0000) GS:ffff97bebec80000(0000) knlGS:0000000000000000 [ 1280.876269] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 1280.876570] CR2: 00007f668decc8e8 CR3: 000000000fc60003 CR4: 0000000000770ef0 [ 1280.876937] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 1280.877313] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 1280.877684] PKRU: 55555554 [ 1280.877828] Call Trace: [ 1280.877960] <TASK> [ 1280.878092] ? __warn (kernel/panic.c:677) [ 1280.878275] ? sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) [ 1280.878505] ? report_bug (lib/bug.c:201 lib/bug.c:219) [ 1280.878706] ? handle_bug (arch/x86/kernel/traps.c:238) [ 1280.878914] ? exc_invalid_op (arch/x86/kernel/traps.c:259 (discriminator 1)) [ 1280.879135] ? asm_exc_invalid_op (./arch/x86/include/asm/idtentry.h:568) [ 1280.879378] ? sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) [ 1280.879618] br_dev_delete (net/bridge/br_if.c:396) [ 1280.879820] br_net_exit_batch_rtnl (net/bridge/br.c:369) [ 1280.880067] cleanup_net (net/core/net_namespace.c:630) [ 1280.880260] ? process_one_work (kernel/workqueue.c:2606) [ 1280.880502] process_one_work (kernel/workqueue.c:2633) [ 1280.880715] worker_thread (kernel/workqueue.c:2700 kernel/workqueue.c:2787) [ 1280.880913] ? __pfx_worker_thread (kernel/workqueue.c:2733) [ 1280.881144] kthread (kernel/kthread.c:388) [ 1280.881312] ? __pfx_kthread (kernel/kthread.c:341) [ 1280.881511] ret_from_fork (arch/x86/kernel/process.c:147) [ 1280.881716] ? __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