====================================== | [ 396.426404] ------------[ cut here ]------------ | [ 396.426799] refcount_t: underflow; use-after-free. | [ 396.427236] WARNING: CPU: 2 PID: 11 at lib/refcount.c:28 refcount_warn_saturate (lib/refcount.c:28 (discriminator 3)) | [ 396.427907] Modules linked in: act_gact cls_flower vxlan ip6_udp_tunnel udp_tunnel bridge stp llc 8021q sch_ingress vrf veth [ 396.429380] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014 [ 396.430286] Workqueue: netns cleanup_net [ 396.430616] RIP: 0010:refcount_warn_saturate (lib/refcount.c:28 (discriminator 3)) [ 396.431041] 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 af a3 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 af a3 mov $0xffffffffa3af70a0,%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 [ 396.432486] RSP: 0018:ffffb1a940063d78 EFLAGS: 00010286 [ 396.432919] RAX: 0000000000000000 RBX: ffff8ad801cc6000 RCX: 00000000ffffdfff [ 396.433501] RDX: 0000000000000000 RSI: 00000000ffffffea RDI: 0000000000000001 [ 396.434069] RBP: ffff8ad801cc65f8 R08: ffffffffa3f64508 R09: 00000000ffffdfff [ 396.434626] R10: ffffffffa3e84520 R11: ffffffffa3f34520 R12: ffff8ad801cc6000 [ 396.435197] R13: ffffb1a940063e08 R14: ffff8ad801cc6b60 R15: ffff8ad803df8050 [ 396.435761] FS: 0000000000000000(0000) GS:ffff8ad83ed00000(0000) knlGS:0000000000000000 [ 396.436402] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 396.436870] CR2: 00005589a02d2fa8 CR3: 00000000018b4002 CR4: 00000000001706f0 [ 396.437436] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 396.438000] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 396.438557] Call Trace: [ 396.438766] [ 396.438955] ? __warn (kernel/panic.c:677) [ 396.439228] ? refcount_warn_saturate (lib/refcount.c:28 (discriminator 3)) [ 396.439601] ? report_bug (lib/bug.c:201 lib/bug.c:219) [ 396.439920] ? handle_bug (arch/x86/kernel/traps.c:238) [ 396.440213] ? exc_invalid_op (arch/x86/kernel/traps.c:259 (discriminator 1)) [ 396.440527] ? asm_exc_invalid_op (./arch/x86/include/asm/idtentry.h:568) [ 396.440889] ? refcount_warn_saturate (lib/refcount.c:28 (discriminator 3)) [ 396.441268] ? refcount_warn_saturate (lib/refcount.c:28 (discriminator 3)) [ 396.441635] br_sysfs_delbr (net/bridge/br_sysfs_br.c:1086) bridge [ 396.442069] br_dev_delete (net/bridge/br_if.c:396) bridge [ 396.442438] br_net_exit_batch_rtnl (net/bridge/br.c:369) bridge [ 396.442870] cleanup_net (net/core/net_namespace.c:628 (discriminator 2)) [ 396.443180] ? process_one_work (kernel/workqueue.c:2606) [ 396.443519] process_one_work (kernel/workqueue.c:2638) [ 396.443862] worker_thread (kernel/workqueue.c:2700 kernel/workqueue.c:2787) [ 396.444172] ? __pfx_worker_thread (kernel/workqueue.c:2733) [ 396.444504] kthread (kernel/kthread.c:388) [ 396.444760] ? __pfx_kthread (kernel/kthread.c:341) [ 396.445079] ret_from_fork (arch/x86/kernel/process.c:153) [ 396.445377] ? __pfx_kthread (kernel/kthread.c:341) [ 396.445678] ret_from_fork_asm (arch/x86/entry/entry_64.S:250) | [ 396.449516] ------------[ cut here ]------------ | [ 396.449895] sysfs group 'bridge' not found for kobject 'br2' | [ 396.450369] WARNING: CPU: 2 PID: 11 at fs/sysfs/group.c:282 sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) | [ 396.451013] Modules linked in: act_gact cls_flower vxlan ip6_udp_tunnel udp_tunnel bridge stp llc 8021q sch_ingress vrf veth [ 396.452575] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014 [ 396.453464] Workqueue: netns cleanup_net [ 396.453791] RIP: 0010:sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) [ 396.454191] 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 af a3 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 af a3 mov $0xffffffffa3af0688,%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) ... [ 396.455635] RSP: 0018:ffffb1a940063d70 EFLAGS: 00010286 [ 396.456058] RAX: 0000000000000000 RBX: ffffffffc0523c60 RCX: 00000000ffffdfff [ 396.456614] RDX: 0000000000000000 RSI: 00000000ffffffea RDI: 0000000000000001 [ 396.457175] RBP: 0000000000000000 R08: ffffffffa3f64508 R09: 00000000ffffdfff [ 396.457728] R10: ffffffffa3e84520 R11: ffffffffa3f34520 R12: ffff8ad801cc65f8 [ 396.458300] R13: ffffb1a940063e08 R14: ffff8ad801cc6b60 R15: ffff8ad803df8050 [ 396.458866] FS: 0000000000000000(0000) GS:ffff8ad83ed00000(0000) knlGS:0000000000000000 [ 396.459492] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 396.459957] CR2: 00005589a02d2fa8 CR3: 00000000018b4002 CR4: 00000000001706f0 [ 396.460519] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 396.461089] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 396.461642] Call Trace: [ 396.461847] [ 396.462041] ? __warn (kernel/panic.c:677) [ 396.462307] ? sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) [ 396.462640] ? report_bug (lib/bug.c:201 lib/bug.c:219) [ 396.462956] ? handle_bug (arch/x86/kernel/traps.c:238) [ 396.463254] ? exc_invalid_op (arch/x86/kernel/traps.c:259 (discriminator 1)) [ 396.463571] ? asm_exc_invalid_op (./arch/x86/include/asm/idtentry.h:568) [ 396.463932] ? sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) [ 396.464269] br_dev_delete (net/bridge/br_if.c:396) bridge [ 396.464658] br_net_exit_batch_rtnl (net/bridge/br.c:369) bridge [ 396.465097] cleanup_net (net/core/net_namespace.c:628 (discriminator 2)) [ 396.465399] ? process_one_work (kernel/workqueue.c:2606) [ 396.465732] process_one_work (kernel/workqueue.c:2638) [ 396.466070] worker_thread (kernel/workqueue.c:2700 kernel/workqueue.c:2787) [ 396.466375] ? __pfx_worker_thread (kernel/workqueue.c:2733) [ 396.466714] kthread (kernel/kthread.c:388) [ 396.466984] ? __pfx_kthread (kernel/kthread.c:341) [ 396.467290] ret_from_fork (arch/x86/kernel/process.c:153) [ 396.467583] ? __pfx_kthread (kernel/kthread.c:341) [ 396.467898] ret_from_fork_asm (arch/x86/entry/entry_64.S:250) | [ 396.599038] ------------[ cut here ]------------ | [ 396.599301] sysfs group 'bridge' not found for kobject 'br2' | [ 396.599634] WARNING: CPU: 1 PID: 11 at fs/sysfs/group.c:282 sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) | [ 396.600086] Modules linked in: act_gact cls_flower vxlan ip6_udp_tunnel udp_tunnel bridge stp llc 8021q sch_ingress vrf veth [ 396.601211] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014 [ 396.601835] Workqueue: netns cleanup_net [ 396.602069] RIP: 0010:sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) [ 396.602353] 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 af a3 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 af a3 mov $0xffffffffa3af0688,%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) ... [ 396.603410] RSP: 0018:ffffb1a940063d70 EFLAGS: 00010286 [ 396.603717] RAX: 0000000000000000 RBX: ffffffffc0523c60 RCX: 00000000ffffdfff [ 396.604130] RDX: 0000000000000000 RSI: 00000000ffffffea RDI: 0000000000000001 [ 396.604530] RBP: 0000000000000000 R08: ffffffffa3f64508 R09: 00000000ffffdfff [ 396.604940] R10: ffffffffa3e84520 R11: ffffffffa3f34520 R12: ffff8ad8025e25f8 [ 396.605347] R13: ffffb1a940063e08 R14: ffff8ad8025e2b60 R15: ffffffffa5413dd0 [ 396.605748] FS: 0000000000000000(0000) GS:ffff8ad83ec80000(0000) knlGS:0000000000000000 [ 396.606218] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 396.606548] CR2: 00007fa1284d9000 CR3: 000000003324c001 CR4: 00000000001706f0 [ 396.606967] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 396.607352] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 396.607728] Call Trace: [ 396.607871] [ 396.607994] ? __warn (kernel/panic.c:677) [ 396.608201] ? sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) [ 396.608440] ? report_bug (lib/bug.c:201 lib/bug.c:219) [ 396.608644] ? handle_bug (arch/x86/kernel/traps.c:238) [ 396.608898] ? exc_invalid_op (arch/x86/kernel/traps.c:259 (discriminator 1)) [ 396.609206] ? asm_exc_invalid_op (./arch/x86/include/asm/idtentry.h:568) [ 396.609519] ? sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) [ 396.609850] br_dev_delete (net/bridge/br_if.c:396) bridge [ 396.610234] br_net_exit_batch_rtnl (net/bridge/br.c:369) bridge [ 396.610667] cleanup_net (net/core/net_namespace.c:628 (discriminator 2)) [ 396.610980] ? process_one_work (kernel/workqueue.c:2606) [ 396.611316] process_one_work (kernel/workqueue.c:2638) [ 396.611642] worker_thread (kernel/workqueue.c:2700 kernel/workqueue.c:2787) [ 396.611959] ? __pfx_worker_thread (kernel/workqueue.c:2733) [ 396.612305] kthread (kernel/kthread.c:388) [ 396.612563] ? __pfx_kthread (kernel/kthread.c:341) [ 396.612877] ret_from_fork (arch/x86/kernel/process.c:153) [ 396.613180] ? __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