====================================== | [ 424.068149][ T68] ================================================================== | [ 424.068632][ T68] BUG: KASAN: slab-use-after-free in kobject_put (lib/kobject.c:729) | [ 424.069036][ T68] Read of size 1 at addr ffff8880083f583c by task kworker/u8:1/68 | [ 424.069489][ T68] [ 424.070063][ T68] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014 [ 424.070704][ T68] Workqueue: netns cleanup_net [ 424.070969][ T68] Call Trace: [ 424.071149][ T68] [ 424.071310][ T68] dump_stack_lvl (lib/dump_stack.c:107) [ 424.071557][ T68] print_address_description.constprop.0 (mm/kasan/report.c:378) [ 424.071909][ T68] ? kobject_put (lib/kobject.c:729) [ 424.072147][ T68] print_report (mm/kasan/report.c:489) [ 424.072388][ T68] ? 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) [ 424.072689][ T68] kasan_report (mm/kasan/report.c:603) [ 424.072935][ T68] ? kobject_put (lib/kobject.c:729) [ 424.073175][ T68] kobject_put (lib/kobject.c:729) [ 424.073401][ T68] br_sysfs_delbr (net/bridge/br_sysfs_br.c:1086) [ 424.073641][ T68] br_dev_delete (net/bridge/br_if.c:396) [ 424.073888][ T68] br_net_exit_batch_rtnl (net/bridge/br.c:369) [ 424.074172][ T68] cleanup_net (net/core/net_namespace.c:628 (discriminator 2)) [ 424.074410][ T68] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5719) [ 424.074714][ T68] ? __pfx_cleanup_net (net/core/net_namespace.c:581) [ 424.074977][ T68] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5725) [ 424.075235][ T68] ? process_one_work (kernel/workqueue.c:2609) [ 424.075510][ T68] process_one_work (kernel/workqueue.c:2638) [ 424.075778][ T68] ? 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) [ 424.076020][ T68] ? __pfx_process_one_work (kernel/workqueue.c:2542) [ 424.076328][ T68] ? assign_work (kernel/workqueue.c:1101) [ 424.076605][ T68] worker_thread (kernel/workqueue.c:2700 kernel/workqueue.c:2787) [ 424.076892][ T68] ? lockdep_hardirqs_on_prepare.part.0 (kernel/locking/lockdep.c:4300 kernel/locking/lockdep.c:4359) [ 424.077259][ T68] ? __pfx_worker_thread (kernel/workqueue.c:2733) [ 424.077557][ T68] ? __pfx_worker_thread (kernel/workqueue.c:2733) [ 424.077877][ T68] kthread (kernel/kthread.c:388) [ 424.078096][ T68] ? __pfx_kthread (kernel/kthread.c:341) [ 424.078344][ T68] ret_from_fork (arch/x86/kernel/process.c:153) [ 424.078582][ T68] ? __pfx_kthread (kernel/kthread.c:341) [ 424.078851][ T68] ret_from_fork_asm (arch/x86/entry/entry_64.S:250) | [ 424.098907][ T68] ------------[ cut here ]------------ | [ 424.099218][ T68] refcount_t: underflow; use-after-free. | [ 424.099581][ T68] WARNING: CPU: 2 PID: 68 at lib/refcount.c:28 refcount_warn_saturate (lib/refcount.c:28 (discriminator 3)) | [ 424.100103][ T68] Modules linked in: xt_length act_ct nf_flow_table cls_flower sch_ingress sctp_diag sctp vxlan ip6_udp_tunnel udp_tunnel nft_chain_nat xt_nat nf_nat nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 nft_compat nf_tables libcrc32c [ 424.101908][ T68] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014 [ 424.102694][ T68] Workqueue: netns cleanup_net [ 424.102964][ T68] RIP: 0010:refcount_warn_saturate (lib/refcount.c:28 (discriminator 3)) [ 424.103315][ T68] Code: f9 82 03 80 fb 01 0f 87 ee 02 b1 01 83 e3 01 0f 85 4d ff ff ff c6 05 9a f9 82 03 01 90 48 c7 c7 20 7a 82 a7 e8 3e 05 2a ff 90 <0f> 0b 90 90 e9 2f ff ff ff 48 89 df e8 8c 68 a6 ff e9 b6 fe ff ff All code ======== 0: f9 stc 1: 82 (bad) 2: 03 80 fb 01 0f 87 add -0x78f0fe05(%rax),%eax 8: ee out %al,(%dx) 9: 02 b1 01 83 e3 01 add 0x1e38301(%rcx),%dh f: 0f 85 4d ff ff ff jne 0xffffffffffffff62 15: c6 05 9a f9 82 03 01 movb $0x1,0x382f99a(%rip) # 0x382f9b6 1c: 90 nop 1d: 48 c7 c7 20 7a 82 a7 mov $0xffffffffa7827a20,%rdi 24: e8 3e 05 2a ff call 0xffffffffff2a0567 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 8c 68 a6 ff call 0xffffffffffa668c7 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 8c 68 a6 ff call 0xffffffffffa6689d 11: e9 b6 fe ff ff jmp 0xfffffffffffffecc [ 424.104341][ T68] RSP: 0018:ffffc900004efb98 EFLAGS: 00010282 [ 424.104668][ T68] RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffffffa4b1056f [ 424.105097][ T68] RDX: 0000000000000000 RSI: 0000000000000008 RDI: 0000000000000001 [ 424.105521][ T68] RBP: 0000000000000003 R08: 0000000000000000 R09: fffff5200009df18 [ 424.105938][ T68] R10: ffffc900004ef8c7 R11: 205d383654202020 R12: ffff888006432000 [ 424.106362][ T68] R13: ffff888006432df8 R14: ffffc900004efc98 R15: ffff888006432bc0 [ 424.106784][ T68] FS: 0000000000000000(0000) GS:ffff888035a00000(0000) knlGS:0000000000000000 [ 424.107328][ T68] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 424.107710][ T68] CR2: 00007fe555f87000 CR3: 000000002bd34006 CR4: 00000000001706f0 [ 424.108143][ T68] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 424.108570][ T68] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 424.109000][ T68] Call Trace: [ 424.109184][ T68] [ 424.109345][ T68] ? __warn (kernel/panic.c:677) [ 424.109566][ T68] ? refcount_warn_saturate (lib/refcount.c:28 (discriminator 3)) [ 424.109861][ T68] ? report_bug (lib/bug.c:201 lib/bug.c:219) [ 424.110123][ T68] ? vprintk_emit (kernel/printk/printk.c:2313) [ 424.110404][ T68] ? handle_bug (arch/x86/kernel/traps.c:238) [ 424.110659][ T68] ? exc_invalid_op (arch/x86/kernel/traps.c:259 (discriminator 1)) [ 424.110920][ T68] ? asm_exc_invalid_op (./arch/x86/include/asm/idtentry.h:568) [ 424.111195][ T68] ? 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) [ 424.111437][ T68] ? refcount_warn_saturate (lib/refcount.c:28 (discriminator 3)) [ 424.111731][ T68] ? refcount_warn_saturate (lib/refcount.c:28 (discriminator 3)) [ 424.112031][ T68] br_sysfs_delbr (net/bridge/br_sysfs_br.c:1086) [ 424.112274][ T68] br_dev_delete (net/bridge/br_if.c:396) [ 424.112521][ T68] br_net_exit_batch_rtnl (net/bridge/br.c:369) [ 424.112806][ T68] cleanup_net (net/core/net_namespace.c:628 (discriminator 2)) [ 424.113047][ T68] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5719) [ 424.113399][ T68] ? __pfx_cleanup_net (net/core/net_namespace.c:581) [ 424.113699][ T68] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5725) [ 424.113961][ T68] ? process_one_work (kernel/workqueue.c:2609) [ 424.114264][ T68] process_one_work (kernel/workqueue.c:2638) [ 424.114561][ T68] ? 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) [ 424.114820][ T68] ? __pfx_process_one_work (kernel/workqueue.c:2542) [ 424.115119][ T68] ? assign_work (kernel/workqueue.c:1101) [ 424.115372][ T68] worker_thread (kernel/workqueue.c:2700 kernel/workqueue.c:2787) [ 424.115627][ T68] ? lockdep_hardirqs_on_prepare.part.0 (kernel/locking/lockdep.c:4300 kernel/locking/lockdep.c:4359) [ 424.115980][ T68] ? __pfx_worker_thread (kernel/workqueue.c:2733) [ 424.116262][ T68] ? __pfx_worker_thread (kernel/workqueue.c:2733) [ 424.116558][ T68] kthread (kernel/kthread.c:388) [ 424.116799][ T68] ? __pfx_kthread (kernel/kthread.c:341) [ 424.117084][ T68] ret_from_fork (arch/x86/kernel/process.c:153) [ 424.117334][ T68] ? __pfx_kthread (kernel/kthread.c:341) [ 424.117601][ T68] ret_from_fork_asm (arch/x86/entry/entry_64.S:250) | [ 424.120698][ T68] ------------[ cut here ]------------ | [ 424.121475][ T68] sysfs group 'bridge' not found for kobject 'br0' | [ 424.121872][ T68] WARNING: CPU: 0 PID: 68 at fs/sysfs/group.c:282 sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) | [ 424.122396][ T68] Modules linked in: xt_length act_ct nf_flow_table cls_flower sch_ingress sctp_diag sctp vxlan ip6_udp_tunnel udp_tunnel nft_chain_nat xt_nat nf_nat nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 nft_compat nf_tables libcrc32c [ 424.124135][ T68] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014 [ 424.124826][ T68] Workqueue: netns cleanup_net [ 424.125138][ T68] RIP: 0010:sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) [ 424.125490][ T68] 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 a7 7c a7 e8 60 65 5e ff 90 <0f> 0b 90 90 48 83 c4 08 5b 5d 41 5c c3 cc cc cc cc e8 e9 c7 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 a7 7c a7 mov $0xffffffffa77ca7a0,%rdi 24: e8 60 65 5e ff call 0xffffffffff5e6589 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 e9 c7 da ff call 0xffffffffffdac829 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 e9 c7 da ff call 0xffffffffffdac7ff [ 424.126542][ T68] RSP: 0018:ffffc900004efba0 EFLAGS: 00010282 [ 424.126902][ T68] RAX: 0000000000000000 RBX: ffffffffa7bbe220 RCX: ffffffffa4b1056f [ 424.127366][ T68] RDX: 0000000000000000 RSI: 0000000000000008 RDI: 0000000000000001 [ 424.127823][ T68] RBP: 0000000000000000 R08: 0000000000000000 R09: fffff5200009df19 [ 424.128270][ T68] R10: ffffc900004ef8cf R11: 205d383654202020 R12: ffff888006432628 [ 424.128724][ T68] R13: ffff888006432df8 R14: ffffc900004efc98 R15: ffff888006432bc0 [ 424.129194][ T68] FS: 0000000000000000(0000) GS:ffff888035200000(0000) knlGS:0000000000000000 [ 424.129704][ T68] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 424.130083][ T68] CR2: 00007f93ce269000 CR3: 000000002bd34002 CR4: 00000000001706f0 [ 424.130618][ T68] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 424.131106][ T68] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 424.131563][ T68] Call Trace: [ 424.131769][ T68] [ 424.131928][ T68] ? __warn (kernel/panic.c:677) [ 424.132196][ T68] ? console_trylock (kernel/printk/printk.c:2659 kernel/printk/printk.c:2654) [ 424.132502][ T68] ? sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) [ 424.132814][ T68] ? report_bug (lib/bug.c:201 lib/bug.c:219) [ 424.133087][ T68] ? handle_bug (arch/x86/kernel/traps.c:238) [ 424.133361][ T68] ? exc_invalid_op (arch/x86/kernel/traps.c:259 (discriminator 1)) [ 424.133643][ T68] ? asm_exc_invalid_op (./arch/x86/include/asm/idtentry.h:568) [ 424.133947][ T68] ? 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) [ 424.134227][ T68] ? sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) [ 424.134523][ T68] br_dev_delete (net/bridge/br_if.c:396) [ 424.134781][ T68] br_net_exit_batch_rtnl (net/bridge/br.c:369) [ 424.135098][ T68] cleanup_net (net/core/net_namespace.c:628 (discriminator 2)) [ 424.135387][ T68] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5719) [ 424.135718][ T68] ? __pfx_cleanup_net (net/core/net_namespace.c:581) [ 424.136009][ T68] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5725) [ 424.136294][ T68] ? process_one_work (kernel/workqueue.c:2609) [ 424.136613][ T68] process_one_work (kernel/workqueue.c:2638) [ 424.136913][ T68] ? 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) [ 424.137186][ T68] ? __pfx_process_one_work (kernel/workqueue.c:2542) [ 424.137475][ T68] ? assign_work (kernel/workqueue.c:1101) [ 424.137720][ T68] worker_thread (kernel/workqueue.c:2700 kernel/workqueue.c:2787) [ 424.137974][ T68] ? lockdep_hardirqs_on_prepare.part.0 (kernel/locking/lockdep.c:4300 kernel/locking/lockdep.c:4359) [ 424.138329][ T68] ? __pfx_worker_thread (kernel/workqueue.c:2733) [ 424.138605][ T68] ? __pfx_worker_thread (kernel/workqueue.c:2733) [ 424.138877][ T68] kthread (kernel/kthread.c:388) [ 424.139105][ T68] ? __pfx_kthread (kernel/kthread.c:341) [ 424.139355][ T68] ret_from_fork (arch/x86/kernel/process.c:153) [ 424.139596][ T68] ? __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