====================================== | [ 173.745523] ------------[ cut here ]------------ | [ 173.745804] refcount_t: underflow; use-after-free. | [ 173.746095] WARNING: CPU: 1 PID: 67 at lib/refcount.c:28 refcount_warn_saturate (lib/refcount.c:28 (discriminator 3)) | [ 173.746536] Modules linked in: xfrm_user psample macsec fou vxlan ip6_udp_tunnel udp_tunnel ip6_gre ip_gre gre sch_htb act_mirred cls_u32 sch_ingress ifb [last unloaded: netdevsim] [ 173.747759] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014 [ 173.748344] Workqueue: netns cleanup_net [ 173.748580] RIP: 0010:refcount_warn_saturate (lib/refcount.c:28 (discriminator 3)) [ 173.748847] 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 73 aa 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 73 aa mov $0xffffffffaa7337b8,%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 [ 173.749807] RSP: 0018:ffffbadc4025bd78 EFLAGS: 00010286 [ 173.750088] RAX: 0000000000000000 RBX: ffff9b82036b8000 RCX: 00000000ffffdfff [ 173.750448] RDX: 0000000000000000 RSI: 00000000ffffffea RDI: 0000000000000001 [ 173.750834] RBP: ffff9b82036b8610 R08: ffffffffaab78508 R09: 00000000ffffdfff [ 173.751200] R10: ffffffffaaa98520 R11: ffffffffaab48520 R12: ffff9b82036b8000 [ 173.751558] R13: ffffbadc4025be08 R14: ffff9b82036b8b80 R15: ffffffffac078f90 [ 173.751937] FS: 0000000000000000(0000) GS:ffff9b823ec80000(0000) knlGS:0000000000000000 [ 173.752364] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 173.752657] CR2: 00007ffe0fdd4d68 CR3: 000000000269a006 CR4: 0000000000770ef0 [ 173.753026] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 173.753416] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 173.753776] PKRU: 55555554 [ 173.753919] Call Trace: [ 173.754060] <TASK> [ 173.754178] ? __warn (kernel/panic.c:677) [ 173.754378] ? refcount_warn_saturate (lib/refcount.c:28 (discriminator 3)) [ 173.754620] ? report_bug (lib/bug.c:201 lib/bug.c:219) [ 173.754816] ? handle_bug (arch/x86/kernel/traps.c:238) [ 173.755010] ? exc_invalid_op (arch/x86/kernel/traps.c:259 (discriminator 1)) [ 173.755211] ? asm_exc_invalid_op (./arch/x86/include/asm/idtentry.h:568) [ 173.755473] ? refcount_warn_saturate (lib/refcount.c:28 (discriminator 3)) [ 173.755719] ? refcount_warn_saturate (lib/refcount.c:28 (discriminator 3)) [ 173.755964] br_sysfs_delbr (net/bridge/br_sysfs_br.c:1086) [ 173.756162] br_dev_delete (net/bridge/br_if.c:396) [ 173.756354] br_net_exit_batch_rtnl (net/bridge/br.c:369) [ 173.756610] cleanup_net (net/core/net_namespace.c:630) [ 173.756803] ? process_one_work (kernel/workqueue.c:2606) [ 173.757032] process_one_work (kernel/workqueue.c:2633) [ 173.757245] worker_thread (kernel/workqueue.c:2700 kernel/workqueue.c:2787) [ 173.757443] ? __pfx_worker_thread (kernel/workqueue.c:2733) [ 173.757668] kthread (kernel/kthread.c:388) [ 173.757861] ? __pfx_kthread (kernel/kthread.c:341) [ 173.758068] ret_from_fork (arch/x86/kernel/process.c:147) [ 173.758259] ? __pfx_kthread (kernel/kthread.c:341) [ 173.758457] ret_from_fork_asm (arch/x86/entry/entry_64.S:250) | [ 173.761026] ------------[ cut here ]------------ | [ 173.761296] sysfs group 'bridge' not found for kobject 'test-br0' | [ 173.761624] WARNING: CPU: 1 PID: 67 at fs/sysfs/group.c:282 sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) | [ 173.762045] Modules linked in: xfrm_user psample macsec fou vxlan ip6_udp_tunnel udp_tunnel ip6_gre ip_gre gre sch_htb act_mirred cls_u32 sch_ingress ifb [last unloaded: netdevsim] [ 173.763326] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014 [ 173.763934] Workqueue: netns cleanup_net [ 173.764155] RIP: 0010:sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) [ 173.764403] 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 72 aa 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 72 aa mov $0xffffffffaa72cda0,%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) ... [ 173.765356] RSP: 0018:ffffbadc4025bd70 EFLAGS: 00010286 [ 173.765637] RAX: 0000000000000000 RBX: ffffffffaa3472c0 RCX: 00000000ffffdfff [ 173.766031] RDX: 0000000000000000 RSI: 00000000ffffffea RDI: 0000000000000001 [ 173.766390] RBP: 0000000000000000 R08: ffffffffaab78508 R09: 00000000ffffdfff [ 173.766750] R10: ffffffffaaa98520 R11: ffffffffaab48520 R12: ffff9b82036b8610 [ 173.767143] R13: ffffbadc4025be08 R14: ffff9b82036b8b80 R15: ffffffffac078f90 [ 173.767503] FS: 0000000000000000(0000) GS:ffff9b823ec80000(0000) knlGS:0000000000000000 [ 173.767914] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 173.768238] CR2: 00007ffe0fdd4d68 CR3: 000000000269a006 CR4: 0000000000770ef0 [ 173.768604] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 173.768974] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 173.769336] PKRU: 55555554 [ 173.769505] Call Trace: [ 173.769640] <TASK> [ 173.769757] ? __warn (kernel/panic.c:677) [ 173.769931] ? sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) [ 173.770157] ? report_bug (lib/bug.c:201 lib/bug.c:219) [ 173.770353] ? handle_bug (arch/x86/kernel/traps.c:238) [ 173.770563] ? exc_invalid_op (arch/x86/kernel/traps.c:259 (discriminator 1)) [ 173.770767] ? asm_exc_invalid_op (./arch/x86/include/asm/idtentry.h:568) [ 173.770999] ? sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) [ 173.771217] br_dev_delete (net/bridge/br_if.c:396) [ 173.771410] br_net_exit_batch_rtnl (net/bridge/br.c:369) [ 173.771643] cleanup_net (net/core/net_namespace.c:630) [ 173.771860] ? process_one_work (kernel/workqueue.c:2606) [ 173.772087] process_one_work (kernel/workqueue.c:2633) [ 173.772301] worker_thread (kernel/workqueue.c:2700 kernel/workqueue.c:2787) [ 173.772498] ? __pfx_worker_thread (kernel/workqueue.c:2733) [ 173.772721] kthread (kernel/kthread.c:388) [ 173.772913] ? __pfx_kthread (kernel/kthread.c:341) [ 173.773118] ret_from_fork (arch/x86/kernel/process.c:147) [ 173.773311] ? __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