====================================== | [ 124.715479] ------------[ cut here ]------------ | [ 124.715739] refcount_t: underflow; use-after-free. | [ 124.716034] WARNING: CPU: 2 PID: 67 at lib/refcount.c:28 refcount_warn_saturate (lib/refcount.c:28 (discriminator 3)) | [ 124.716470] Modules linked in: act_tunnel_key cls_flower bareudp mpls_iptunnel mpls_router act_mirred cls_matchall ip6_gre gre nft_chain_nat xt_nat nf_nat vxlan cls_bpf sch_ingress xt_conntrack nf_conntrack nf_defrag_ipv4 nft_compat nf_tables nf_defrag_ipv6 sctp_diag sctp ip6_udp_tunnel udp_tunnel libcrc32c [ 124.718508] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014 [ 124.719559] Workqueue: netns cleanup_net [ 124.719960] RIP: 0010:refcount_warn_saturate (lib/refcount.c:28 (discriminator 3)) [ 124.720395] 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 f3 89 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 f3 89 mov $0xffffffff89f337b8,%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 [ 124.721782] RSP: 0018:ffffb0e90025bd78 EFLAGS: 00010286 [ 124.722098] RAX: 0000000000000000 RBX: ffff8f0a02a14000 RCX: 00000000ffffdfff [ 124.722515] RDX: 0000000000000000 RSI: 00000000ffffffea RDI: 0000000000000001 [ 124.722897] RBP: ffff8f0a02a14610 R08: ffffffff8a378508 R09: 00000000ffffdfff [ 124.723275] R10: ffffffff8a298520 R11: ffffffff8a348520 R12: ffff8f0a02a14000 [ 124.723653] R13: ffffb0e90025be08 R14: ffff8f0a02a14b80 R15: ffff8f0a05704550 [ 124.724038] FS: 0000000000000000(0000) GS:ffff8f0a3ed00000(0000) knlGS:0000000000000000 [ 124.724462] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 124.724772] CR2: 00007f29f2d01000 CR3: 000000001e860004 CR4: 0000000000770ef0 [ 124.725148] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 124.725522] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 124.725910] PKRU: 55555554 [ 124.726056] Call Trace: [ 124.726199] <TASK> [ 124.726323] ? __warn (kernel/panic.c:677) [ 124.726501] ? refcount_warn_saturate (lib/refcount.c:28 (discriminator 3)) [ 124.726752] ? report_bug (lib/bug.c:201 lib/bug.c:219) [ 124.726957] ? handle_bug (arch/x86/kernel/traps.c:238) [ 124.727146] ? exc_invalid_op (arch/x86/kernel/traps.c:259 (discriminator 1)) [ 124.727348] ? asm_exc_invalid_op (./arch/x86/include/asm/idtentry.h:568) [ 124.727574] ? refcount_warn_saturate (lib/refcount.c:28 (discriminator 3)) [ 124.727813] ? refcount_warn_saturate (lib/refcount.c:28 (discriminator 3)) [ 124.728064] br_sysfs_delbr (net/bridge/br_sysfs_br.c:1086) [ 124.728269] br_dev_delete (net/bridge/br_if.c:396) [ 124.728463] br_net_exit_batch_rtnl (net/bridge/br.c:369) [ 124.728695] cleanup_net (net/core/net_namespace.c:630) [ 124.728981] ? process_one_work (kernel/workqueue.c:2606) [ 124.729316] process_one_work (kernel/workqueue.c:2633) [ 124.729640] worker_thread (kernel/workqueue.c:2700 kernel/workqueue.c:2787) [ 124.729961] ? __pfx_worker_thread (kernel/workqueue.c:2733) [ 124.730302] kthread (kernel/kthread.c:388) [ 124.730528] ? __pfx_kthread (kernel/kthread.c:341) [ 124.730730] ret_from_fork (arch/x86/kernel/process.c:147) [ 124.730937] ? __pfx_kthread (kernel/kthread.c:341) [ 124.731137] ret_from_fork_asm (arch/x86/entry/entry_64.S:250) | [ 124.733756] ------------[ cut here ]------------ | [ 124.734067] sysfs group 'bridge' not found for kobject 'br0' | [ 124.734579] WARNING: CPU: 1 PID: 67 at fs/sysfs/group.c:282 sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) | [ 124.735020] Modules linked in: act_tunnel_key cls_flower bareudp mpls_iptunnel mpls_router act_mirred cls_matchall ip6_gre gre nft_chain_nat xt_nat nf_nat vxlan cls_bpf sch_ingress xt_conntrack nf_conntrack nf_defrag_ipv4 nft_compat nf_tables nf_defrag_ipv6 sctp_diag sctp ip6_udp_tunnel udp_tunnel libcrc32c [ 124.736920] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014 [ 124.737891] Workqueue: netns cleanup_net [ 124.738285] RIP: 0010:sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) [ 124.738550] 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 f2 89 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 f2 89 mov $0xffffffff89f2cda0,%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) ... [ 124.739925] RSP: 0018:ffffb0e90025bd70 EFLAGS: 00010286 [ 124.740296] RAX: 0000000000000000 RBX: ffffffff89b472c0 RCX: 00000000ffffdfff [ 124.740913] RDX: 0000000000000000 RSI: 00000000ffffffea RDI: 0000000000000001 [ 124.741544] RBP: 0000000000000000 R08: ffffffff8a378508 R09: 00000000ffffdfff [ 124.742235] R10: ffffffff8a298520 R11: ffffffff8a348520 R12: ffff8f0a02a14610 [ 124.742925] R13: ffffb0e90025be08 R14: ffff8f0a02a14b80 R15: ffff8f0a05704550 [ 124.743600] FS: 0000000000000000(0000) GS:ffff8f0a3ec80000(0000) knlGS:0000000000000000 [ 124.744337] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 124.744865] CR2: 0000561bafc81dec CR3: 000000001e860002 CR4: 0000000000770ef0 [ 124.745512] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 124.746181] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 124.746808] PKRU: 55555554 [ 124.747090] Call Trace: [ 124.747341] <TASK> [ 124.747536] ? __warn (kernel/panic.c:677) [ 124.747791] ? sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) [ 124.748022] ? report_bug (lib/bug.c:201 lib/bug.c:219) [ 124.748220] ? handle_bug (arch/x86/kernel/traps.c:238) [ 124.748484] ? exc_invalid_op (arch/x86/kernel/traps.c:259 (discriminator 1)) [ 124.748700] ? asm_exc_invalid_op (./arch/x86/include/asm/idtentry.h:568) [ 124.748937] ? sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) [ 124.749171] br_dev_delete (net/bridge/br_if.c:396) [ 124.749376] br_net_exit_batch_rtnl (net/bridge/br.c:369) [ 124.749616] cleanup_net (net/core/net_namespace.c:630) [ 124.749846] ? process_one_work (kernel/workqueue.c:2606) [ 124.750202] process_one_work (kernel/workqueue.c:2633) [ 124.750541] worker_thread (kernel/workqueue.c:2700 kernel/workqueue.c:2787) [ 124.750789] ? __pfx_worker_thread (kernel/workqueue.c:2733) [ 124.751064] kthread (kernel/kthread.c:388) [ 124.751337] ? __pfx_kthread (kernel/kthread.c:341) [ 124.751632] ret_from_fork (arch/x86/kernel/process.c:147) [ 124.752002] ? __pfx_kthread (kernel/kthread.c:341) [ 124.752335] ret_from_fork_asm (arch/x86/entry/entry_64.S:250) | [ 124.876098] ------------[ cut here ]------------ | [ 124.876359] sysfs group 'bridge' not found for kobject 'br0' | [ 124.876674] WARNING: CPU: 1 PID: 67 at fs/sysfs/group.c:282 sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) | [ 124.877114] Modules linked in: act_tunnel_key cls_flower bareudp mpls_iptunnel mpls_router act_mirred cls_matchall ip6_gre gre nft_chain_nat xt_nat nf_nat vxlan cls_bpf sch_ingress xt_conntrack nf_conntrack nf_defrag_ipv4 nft_compat nf_tables nf_defrag_ipv6 sctp_diag sctp ip6_udp_tunnel udp_tunnel libcrc32c [ 124.878981] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014 [ 124.879561] Workqueue: netns cleanup_net [ 124.879785] RIP: 0010:sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) [ 124.880058] 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 f2 89 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 f2 89 mov $0xffffffff89f2cda0,%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) ... [ 124.881017] RSP: 0018:ffffb0e90025bd70 EFLAGS: 00010286 [ 124.881294] RAX: 0000000000000000 RBX: ffffffff89b472c0 RCX: 00000000ffffdfff [ 124.881665] RDX: 0000000000000000 RSI: 00000000ffffffea RDI: 0000000000000001 [ 124.882044] RBP: 0000000000000000 R08: ffffffff8a378508 R09: 00000000ffffdfff [ 124.882417] R10: ffffffff8a298520 R11: ffffffff8a348520 R12: ffff8f0a0237c610 [ 124.882824] R13: ffffb0e90025be08 R14: ffff8f0a0237cb80 R15: ffffffff8b878f90 [ 124.883218] FS: 0000000000000000(0000) GS:ffff8f0a3ec80000(0000) knlGS:0000000000000000 [ 124.883673] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 124.883997] CR2: 00007f6e6c57d0e0 CR3: 000000001e860003 CR4: 0000000000770ef0 [ 124.884363] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 124.884736] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 124.885109] PKRU: 55555554 [ 124.885257] Call Trace: [ 124.885403] <TASK> [ 124.885537] ? __warn (kernel/panic.c:677) [ 124.885730] ? sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) [ 124.885984] ? report_bug (lib/bug.c:201 lib/bug.c:219) [ 124.886194] ? handle_bug (arch/x86/kernel/traps.c:238) [ 124.886417] ? exc_invalid_op (arch/x86/kernel/traps.c:259 (discriminator 1)) [ 124.886639] ? asm_exc_invalid_op (./arch/x86/include/asm/idtentry.h:568) [ 124.886884] ? sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) [ 124.887114] br_dev_delete (net/bridge/br_if.c:396) [ 124.887314] br_net_exit_batch_rtnl (net/bridge/br.c:369) [ 124.887550] cleanup_net (net/core/net_namespace.c:630) [ 124.887748] ? process_one_work (kernel/workqueue.c:2606) [ 124.887977] process_one_work (kernel/workqueue.c:2633) [ 124.888195] worker_thread (kernel/workqueue.c:2700 kernel/workqueue.c:2787) [ 124.888405] ? __pfx_worker_thread (kernel/workqueue.c:2733) [ 124.888629] kthread (kernel/kthread.c:388) [ 124.888802] ? __pfx_kthread (kernel/kthread.c:341) [ 124.889008] ret_from_fork (arch/x86/kernel/process.c:147) [ 124.889202] ? __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