====================================== | [ 680.448390][ T70] ================================================================== | [ 680.448836][ T70] BUG: KASAN: slab-use-after-free in kobject_put (lib/kobject.c:729) | [ 680.449226][ T70] Read of size 1 at addr ffff88800670797c by task kworker/u8:1/70 | [ 680.449634][ T70] [ 680.450194][ T70] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014 [ 680.450836][ T70] Workqueue: netns cleanup_net [ 680.451098][ T70] Call Trace: [ 680.451281][ T70] [ 680.451443][ T70] dump_stack_lvl (lib/dump_stack.c:107) [ 680.451687][ T70] print_address_description.constprop.0 (mm/kasan/report.c:378) [ 680.452039][ T70] ? kobject_put (lib/kobject.c:729) [ 680.452279][ T70] print_report (mm/kasan/report.c:489) [ 680.452514][ T70] ? kasan_addr_to_slab (./arch/x86/include/asm/bitops.h:206 ./arch/x86/include/asm/bitops.h:238 ./include/asm-generic/bitops/instrumented-non-atomic.h:142 ./include/linux/page-flags.h:481 mm/kasan/../slab.h:206 mm/kasan/common.c:38) [ 680.452787][ T70] kasan_report (mm/kasan/report.c:603) [ 680.453020][ T70] ? kobject_put (lib/kobject.c:729) [ 680.453262][ T70] kobject_put (lib/kobject.c:729) [ 680.453489][ T70] br_sysfs_delbr (net/bridge/br_sysfs_br.c:1086) bridge [ 680.453851][ T70] br_dev_delete (net/bridge/br_if.c:396) bridge [ 680.454169][ T70] br_net_exit_batch_rtnl (net/bridge/br.c:369) bridge [ 680.454521][ T70] cleanup_net (net/core/net_namespace.c:628 (discriminator 2)) [ 680.454756][ T70] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5719) [ 680.455058][ T70] ? __pfx_cleanup_net (net/core/net_namespace.c:581) [ 680.455329][ T70] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5725) [ 680.455575][ T70] ? process_one_work (kernel/workqueue.c:2609) [ 680.455846][ T70] process_one_work (kernel/workqueue.c:2638) [ 680.456112][ T70] ? hlock_class (./arch/x86/include/asm/bitops.h:227 ./arch/x86/include/asm/bitops.h:239 ./include/asm-generic/bitops/instrumented-non-atomic.h:142 kernel/locking/lockdep.c:228) [ 680.456352][ T70] ? __pfx_process_one_work (kernel/workqueue.c:2542) [ 680.456636][ T70] ? assign_work (kernel/workqueue.c:1101) [ 680.456883][ T70] worker_thread (kernel/workqueue.c:2700 kernel/workqueue.c:2787) [ 680.457137][ T70] ? lockdep_hardirqs_on_prepare.part.0 (kernel/locking/lockdep.c:4300 kernel/locking/lockdep.c:4359) [ 680.457485][ T70] ? __pfx_worker_thread (kernel/workqueue.c:2733) [ 680.457759][ T70] ? __pfx_worker_thread (kernel/workqueue.c:2733) [ 680.458027][ T70] kthread (kernel/kthread.c:388) [ 680.458248][ T70] ? __pfx_kthread (kernel/kthread.c:341) [ 680.458494][ T70] ret_from_fork (arch/x86/kernel/process.c:153) [ 680.458731][ T70] ? __pfx_kthread (kernel/kthread.c:341) [ 680.458972][ T70] ret_from_fork_asm (arch/x86/entry/entry_64.S:250) | [ 680.478204][ T70] ------------[ cut here ]------------ | [ 680.478492][ T70] refcount_t: underflow; use-after-free. | [ 680.478820][ T70] WARNING: CPU: 1 PID: 70 at lib/refcount.c:28 refcount_warn_saturate (lib/refcount.c:28 (discriminator 3)) | [ 680.479374][ T70] Modules linked in: vxlan ip6_udp_tunnel udp_tunnel ip6_gre ip6_tunnel tunnel6 cls_matchall bridge stp llc macvlan act_mirred act_police act_gact cls_flower sch_ingress ip_gre gre 8021q vrf veth [ 680.480995][ T70] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014 [ 680.481711][ T70] Workqueue: netns cleanup_net [ 680.481969][ T70] RIP: 0010:refcount_warn_saturate (lib/refcount.c:28 (discriminator 3)) [ 680.482358][ T70] Code: 64 5d 03 80 fb 01 0f 87 54 5a 91 01 83 e3 01 0f 85 4d ff ff ff c6 05 d6 64 5d 03 01 90 48 c7 c7 00 58 82 8c e8 5e 4c 2b ff 90 <0f> 0b 90 90 e9 2f ff ff ff 48 89 df e8 7c 23 a7 ff e9 b6 fe ff ff All code ======== 0: 64 5d fs pop %rbp 2: 03 80 fb 01 0f 87 add -0x78f0fe05(%rax),%eax 8: 54 push %rsp 9: 5a pop %rdx a: 91 xchg %eax,%ecx b: 01 83 e3 01 0f 85 add %eax,-0x7af0fe1d(%rbx) 11: 4d ff rex.WRB (bad) 13: ff (bad) 14: ff c6 inc %esi 16: 05 d6 64 5d 03 add $0x35d64d6,%eax 1b: 01 90 48 c7 c7 00 add %edx,0xc7c748(%rax) 21: 58 pop %rax 22: 82 (bad) 23: 8c e8 mov %gs,%eax 25: 5e pop %rsi 26: 4c 2b ff sub %rdi,%r15 29: 90 nop 2a:* 0f 0b ud2 <-- trapping instruction 2c: 90 nop 2d: 90 nop 2e: e9 2f ff ff ff jmp 0xffffffffffffff62 33: 48 89 df mov %rbx,%rdi 36: e8 7c 23 a7 ff call 0xffffffffffa723b7 3b: e9 b6 fe ff ff jmp 0xfffffffffffffef6 Code starting with the faulting instruction =========================================== 0: 0f 0b ud2 2: 90 nop 3: 90 nop 4: e9 2f ff ff ff jmp 0xffffffffffffff38 9: 48 89 df mov %rbx,%rdi c: e8 7c 23 a7 ff call 0xffffffffffa7238d 11: e9 b6 fe ff ff jmp 0xfffffffffffffecc [ 680.483428][ T70] RSP: 0018:ffffc9000050fb98 EFLAGS: 00010282 [ 680.483747][ T70] RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffffff89d0e74f [ 680.484219][ T70] RDX: 0000000000000000 RSI: 0000000000000008 RDI: 0000000000000001 [ 680.484637][ T70] RBP: 0000000000000003 R08: 0000000000000000 R09: fffff520000a1f18 [ 680.485052][ T70] R10: ffffc9000050f8c7 R11: 205d303754202020 R12: ffff888009eea000 [ 680.485534][ T70] R13: ffff888009eeadd8 R14: ffffc9000050fc98 R15: ffff888009eeaba0 [ 680.485950][ T70] FS: 0000000000000000(0000) GS:ffff888035600000(0000) knlGS:0000000000000000 [ 680.486474][ T70] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 680.486820][ T70] CR2: 000055ddda2ceca8 CR3: 000000000a0d0005 CR4: 00000000001706f0 [ 680.487299][ T70] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 680.487715][ T70] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 680.488194][ T70] Call Trace: [ 680.488371][ T70] [ 680.488529][ T70] ? __warn (kernel/panic.c:677) [ 680.488748][ T70] ? refcount_warn_saturate (lib/refcount.c:28 (discriminator 3)) [ 680.489041][ T70] ? report_bug (lib/bug.c:201 lib/bug.c:219) [ 680.489355][ T70] ? vprintk_emit (kernel/printk/printk.c:2313) [ 680.489602][ T70] ? handle_bug (arch/x86/kernel/traps.c:238) [ 680.489837][ T70] ? exc_invalid_op (arch/x86/kernel/traps.c:259 (discriminator 1)) [ 680.490087][ T70] ? asm_exc_invalid_op (./arch/x86/include/asm/idtentry.h:568) [ 680.490412][ T70] ? desc_read (./arch/x86/include/asm/atomic64_64.h:20 ./include/linux/atomic/atomic-arch-fallback.h:2615 ./include/linux/atomic/atomic-long.h:79 ./include/linux/atomic/atomic-instrumented.h:3196 kernel/printk/printk_ringbuffer.c:534) [ 680.490648][ T70] ? refcount_warn_saturate (lib/refcount.c:28 (discriminator 3)) [ 680.490945][ T70] ? refcount_warn_saturate (lib/refcount.c:28 (discriminator 3)) [ 680.491297][ T70] br_sysfs_delbr (net/bridge/br_sysfs_br.c:1086) bridge [ 680.491624][ T70] br_dev_delete (net/bridge/br_if.c:396) bridge [ 680.491942][ T70] br_net_exit_batch_rtnl (net/bridge/br.c:369) bridge [ 680.492381][ T70] cleanup_net (net/core/net_namespace.c:628 (discriminator 2)) [ 680.492618][ T70] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5719) [ 680.492918][ T70] ? __pfx_cleanup_net (net/core/net_namespace.c:581) [ 680.493307][ T70] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5725) [ 680.493557][ T70] ? process_one_work (kernel/workqueue.c:2609) [ 680.493829][ T70] process_one_work (kernel/workqueue.c:2638) [ 680.494095][ T70] ? hlock_class (./arch/x86/include/asm/bitops.h:227 ./arch/x86/include/asm/bitops.h:239 ./include/asm-generic/bitops/instrumented-non-atomic.h:142 kernel/locking/lockdep.c:228) [ 680.494472][ T70] ? __pfx_process_one_work (kernel/workqueue.c:2542) [ 680.494763][ T70] ? assign_work (kernel/workqueue.c:1101) [ 680.495011][ T70] worker_thread (kernel/workqueue.c:2700 kernel/workqueue.c:2787) [ 680.495351][ T70] ? lockdep_hardirqs_on_prepare.part.0 (kernel/locking/lockdep.c:4300 kernel/locking/lockdep.c:4359) [ 680.495701][ T70] ? __pfx_worker_thread (kernel/workqueue.c:2733) [ 680.495975][ T70] ? __pfx_worker_thread (kernel/workqueue.c:2733) [ 680.496352][ T70] kthread (kernel/kthread.c:388) [ 680.496569][ T70] ? __pfx_kthread (kernel/kthread.c:341) [ 680.496815][ T70] ret_from_fork (arch/x86/kernel/process.c:153) [ 680.497054][ T70] ? __pfx_kthread (kernel/kthread.c:341) [ 680.497372][ T70] ret_from_fork_asm (arch/x86/entry/entry_64.S:250) | [ 680.500586][ T70] ------------[ cut here ]------------ | [ 680.500911][ T70] sysfs group 'bridge' not found for kobject 'br1' | [ 680.501299][ T70] WARNING: CPU: 3 PID: 70 at fs/sysfs/group.c:282 sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) | [ 680.501779][ T70] Modules linked in: vxlan ip6_udp_tunnel udp_tunnel ip6_gre ip6_tunnel tunnel6 cls_matchall bridge stp llc macvlan act_mirred act_police act_gact cls_flower sch_ingress ip_gre gre 8021q vrf veth [ 680.503316][ T70] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014 [ 680.503964][ T70] Workqueue: netns cleanup_net [ 680.504228][ T70] RIP: 0010:sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) [ 680.504536][ T70] Code: 89 d9 49 8b 14 24 48 b8 00 00 00 00 00 fc ff df 48 c1 e9 03 80 3c 01 00 75 45 48 8b 33 48 c7 c7 a0 99 7c 8c e8 10 18 5f ff 90 <0f> 0b 90 90 48 83 c4 08 5b 5d 41 5c c3 cc cc cc cc e8 69 ee da ff All code ======== 0: 89 d9 mov %ebx,%ecx 2: 49 8b 14 24 mov (%r12),%rdx 6: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax d: fc ff df 10: 48 c1 e9 03 shr $0x3,%rcx 14: 80 3c 01 00 cmpb $0x0,(%rcx,%rax,1) 18: 75 45 jne 0x5f 1a: 48 8b 33 mov (%rbx),%rsi 1d: 48 c7 c7 a0 99 7c 8c mov $0xffffffff8c7c99a0,%rdi 24: e8 10 18 5f ff call 0xffffffffff5f1839 29: 90 nop 2a:* 0f 0b ud2 <-- trapping instruction 2c: 90 nop 2d: 90 nop 2e: 48 83 c4 08 add $0x8,%rsp 32: 5b pop %rbx 33: 5d pop %rbp 34: 41 5c pop %r12 36: c3 ret 37: cc int3 38: cc int3 39: cc int3 3a: cc int3 3b: e8 69 ee da ff call 0xffffffffffdaeea9 Code starting with the faulting instruction =========================================== 0: 0f 0b ud2 2: 90 nop 3: 90 nop 4: 48 83 c4 08 add $0x8,%rsp 8: 5b pop %rbx 9: 5d pop %rbp a: 41 5c pop %r12 c: c3 ret d: cc int3 e: cc int3 f: cc int3 10: cc int3 11: e8 69 ee da ff call 0xffffffffffdaee7f [ 680.505574][ T70] RSP: 0018:ffffc9000050fba0 EFLAGS: 00010282 [ 680.505902][ T70] RAX: 0000000000000000 RBX: ffffffffc07b2f00 RCX: ffffffff89d0e74f [ 680.506332][ T70] RDX: 0000000000000000 RSI: 0000000000000008 RDI: 0000000000000001 [ 680.506756][ T70] RBP: 0000000000000000 R08: 0000000000000000 R09: fffff520000a1f19 [ 680.507181][ T70] R10: ffffc9000050f8cf R11: 205d303754202020 R12: ffff888009eea610 [ 680.507602][ T70] R13: ffff888009eeadd8 R14: ffffc9000050fc98 R15: ffff888009eeaba0 [ 680.508026][ T70] FS: 0000000000000000(0000) GS:ffff888035e00000(0000) knlGS:0000000000000000 [ 680.508502][ T70] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 680.508851][ T70] CR2: 000000000044a3a0 CR3: 000000000803a003 CR4: 00000000001706f0 [ 680.509276][ T70] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 680.509693][ T70] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 680.510108][ T70] Call Trace: [ 680.510290][ T70] [ 680.510451][ T70] ? __warn (kernel/panic.c:677) [ 680.510670][ T70] ? console_trylock (kernel/printk/printk.c:2659 kernel/printk/printk.c:2654) [ 680.510934][ T70] ? sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) [ 680.511217][ T70] ? report_bug (lib/bug.c:201 lib/bug.c:219) [ 680.511463][ T70] ? handle_bug (arch/x86/kernel/traps.c:238) [ 680.511693][ T70] ? exc_invalid_op (arch/x86/kernel/traps.c:259 (discriminator 1)) [ 680.511944][ T70] ? asm_exc_invalid_op (./arch/x86/include/asm/idtentry.h:568) [ 680.512219][ T70] ? desc_read (./arch/x86/include/asm/atomic64_64.h:20 ./include/linux/atomic/atomic-arch-fallback.h:2615 ./include/linux/atomic/atomic-long.h:79 ./include/linux/atomic/atomic-instrumented.h:3196 kernel/printk/printk_ringbuffer.c:534) [ 680.512457][ T70] ? sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) [ 680.512737][ T70] br_dev_delete (net/bridge/br_if.c:396) bridge [ 680.513067][ T70] br_net_exit_batch_rtnl (net/bridge/br.c:369) bridge [ 680.513428][ T70] cleanup_net (net/core/net_namespace.c:628 (discriminator 2)) [ 680.513667][ T70] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5719) [ 680.513967][ T70] ? __pfx_cleanup_net (net/core/net_namespace.c:581) [ 680.514237][ T70] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5725) [ 680.514487][ T70] ? process_one_work (kernel/workqueue.c:2609) [ 680.514761][ T70] process_one_work (kernel/workqueue.c:2638) [ 680.515031][ T70] ? hlock_class (./arch/x86/include/asm/bitops.h:227 ./arch/x86/include/asm/bitops.h:239 ./include/asm-generic/bitops/instrumented-non-atomic.h:142 kernel/locking/lockdep.c:228) [ 680.515290][ T70] ? __pfx_process_one_work (kernel/workqueue.c:2542) [ 680.515578][ T70] ? assign_work (kernel/workqueue.c:1101) [ 680.515827][ T70] worker_thread (kernel/workqueue.c:2700 kernel/workqueue.c:2787) [ 680.516076][ T70] ? lockdep_hardirqs_on_prepare.part.0 (kernel/locking/lockdep.c:4300 kernel/locking/lockdep.c:4359) [ 680.516432][ T70] ? __pfx_worker_thread (kernel/workqueue.c:2733) [ 680.516705][ T70] ? __pfx_worker_thread (kernel/workqueue.c:2733) [ 680.516979][ T70] kthread (kernel/kthread.c:388) [ 680.517205][ T70] ? __pfx_kthread (kernel/kthread.c:341) [ 680.517453][ T70] ret_from_fork (arch/x86/kernel/process.c:153) [ 680.517691][ T70] ? __pfx_kthread (kernel/kthread.c:341) Finger prints: dump_stack_lvl:print_report:kasan_report:kobject_put 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