====================================== | [ 426.411469][ T70] ================================================================== | [ 426.411919][ T70] BUG: KASAN: slab-use-after-free in kobject_put (lib/kobject.c:729) | [ 426.412336][ T70] Read of size 1 at addr ffff888001d85e7c by task kworker/u8:1/70 | [ 426.412747][ T70] [ 426.413296][ T70] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014 [ 426.413938][ T70] Workqueue: netns cleanup_net [ 426.414201][ T70] Call Trace: [ 426.414379][ T70] [ 426.414535][ T70] dump_stack_lvl (lib/dump_stack.c:107) [ 426.414779][ T70] print_address_description.constprop.0 (mm/kasan/report.c:378) [ 426.415127][ T70] ? kobject_put (lib/kobject.c:729) [ 426.415363][ T70] print_report (mm/kasan/report.c:489) [ 426.415600][ 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) [ 426.415866][ T70] kasan_report (mm/kasan/report.c:603) [ 426.416098][ T70] ? kobject_put (lib/kobject.c:729) [ 426.416334][ T70] kobject_put (lib/kobject.c:729) [ 426.416563][ T70] br_sysfs_delbr (net/bridge/br_sysfs_br.c:1086) [ 426.416803][ T70] br_dev_delete (net/bridge/br_if.c:396) [ 426.417051][ T70] br_net_exit_batch_rtnl (net/bridge/br.c:369) [ 426.417335][ T70] cleanup_net (net/core/net_namespace.c:628 (discriminator 2)) [ 426.417569][ T70] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5719) [ 426.417867][ T70] ? __pfx_cleanup_net (net/core/net_namespace.c:581) [ 426.418137][ T70] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5725) [ 426.418385][ T70] ? process_one_work (kernel/workqueue.c:2609) [ 426.418657][ T70] process_one_work (kernel/workqueue.c:2638) [ 426.418922][ 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) [ 426.419162][ T70] ? __pfx_process_one_work (kernel/workqueue.c:2542) [ 426.419444][ T70] ? assign_work (kernel/workqueue.c:1101) [ 426.419687][ T70] worker_thread (kernel/workqueue.c:2700 kernel/workqueue.c:2787) [ 426.419937][ T70] ? lockdep_hardirqs_on_prepare.part.0 (kernel/locking/lockdep.c:4300 kernel/locking/lockdep.c:4359) [ 426.420292][ T70] ? __pfx_worker_thread (kernel/workqueue.c:2733) [ 426.420564][ T70] ? __pfx_worker_thread (kernel/workqueue.c:2733) [ 426.420832][ T70] kthread (kernel/kthread.c:388) [ 426.421047][ T70] ? __pfx_kthread (kernel/kthread.c:341) [ 426.421289][ T70] ret_from_fork (arch/x86/kernel/process.c:153) [ 426.421528][ T70] ? __pfx_kthread (kernel/kthread.c:341) [ 426.421772][ T70] ret_from_fork_asm (arch/x86/entry/entry_64.S:250) | [ 426.440693][ T70] ------------[ cut here ]------------ | [ 426.441022][ T70] refcount_t: underflow; use-after-free. | [ 426.441394][ T70] WARNING: CPU: 0 PID: 70 at lib/refcount.c:28 refcount_warn_saturate (lib/refcount.c:28 (discriminator 3)) | [ 426.441917][ T70] Modules linked in: xt_HL amt udp_tunnel xt_conntrack cls_bpf nft_chain_nat xt_nat nf_nat nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 nft_compat nf_tables libcrc32c act_mirred cls_u32 sch_ingress ifb [ 426.443558][ T70] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014 [ 426.444245][ T70] Workqueue: netns cleanup_net [ 426.444503][ T70] RIP: 0010:refcount_warn_saturate (lib/refcount.c:28 (discriminator 3)) [ 426.444876][ T70] 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 02 9e 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 02 9e mov $0xffffffff9e027a20,%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 [ 426.445943][ T70] RSP: 0018:ffffc9000050fb98 EFLAGS: 00010282 [ 426.446318][ T70] RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffffff9b31056f [ 426.446768][ T70] RDX: 0000000000000000 RSI: 0000000000000008 RDI: 0000000000000001 [ 426.447238][ T70] RBP: 0000000000000003 R08: 0000000000000000 R09: fffff520000a1f18 [ 426.447704][ T70] R10: ffffc9000050f8c7 R11: 205d303754202020 R12: ffff88800ae42000 [ 426.448227][ T70] R13: ffff88800ae42df8 R14: ffffc9000050fc98 R15: ffff88800ae42bc0 [ 426.448676][ T70] FS: 0000000000000000(0000) GS:ffff888035200000(0000) knlGS:0000000000000000 [ 426.449196][ T70] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 426.449594][ T70] CR2: 00007facc307e000 CR3: 000000002e734003 CR4: 00000000001706f0 [ 426.450063][ T70] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 426.450507][ T70] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 426.450963][ T70] Call Trace: [ 426.451159][ T70] [ 426.451350][ T70] ? __warn (kernel/panic.c:677) [ 426.451584][ T70] ? refcount_warn_saturate (lib/refcount.c:28 (discriminator 3)) [ 426.451906][ T70] ? report_bug (lib/bug.c:201 lib/bug.c:219) [ 426.452190][ T70] ? vprintk_emit (kernel/printk/printk.c:2313) [ 426.452484][ T70] ? handle_bug (arch/x86/kernel/traps.c:238) [ 426.452764][ T70] ? exc_invalid_op (arch/x86/kernel/traps.c:259 (discriminator 1)) [ 426.453064][ T70] ? asm_exc_invalid_op (./arch/x86/include/asm/idtentry.h:568) [ 426.453363][ 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) [ 426.453639][ T70] ? refcount_warn_saturate (lib/refcount.c:28 (discriminator 3)) [ 426.453977][ T70] ? refcount_warn_saturate (lib/refcount.c:28 (discriminator 3)) [ 426.454317][ T70] br_sysfs_delbr (net/bridge/br_sysfs_br.c:1086) [ 426.454590][ T70] br_dev_delete (net/bridge/br_if.c:396) [ 426.454881][ T70] br_net_exit_batch_rtnl (net/bridge/br.c:369) [ 426.455222][ T70] cleanup_net (net/core/net_namespace.c:628 (discriminator 2)) [ 426.455458][ T70] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5719) [ 426.455757][ T70] ? __pfx_cleanup_net (net/core/net_namespace.c:581) [ 426.456021][ T70] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5725) [ 426.456282][ T70] ? process_one_work (kernel/workqueue.c:2609) [ 426.456553][ T70] process_one_work (kernel/workqueue.c:2638) [ 426.456818][ 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) [ 426.457103][ T70] ? __pfx_process_one_work (kernel/workqueue.c:2542) [ 426.457418][ T70] ? assign_work (kernel/workqueue.c:1101) [ 426.457710][ T70] worker_thread (kernel/workqueue.c:2700 kernel/workqueue.c:2787) [ 426.458008][ T70] ? lockdep_hardirqs_on_prepare.part.0 (kernel/locking/lockdep.c:4300 kernel/locking/lockdep.c:4359) [ 426.458417][ T70] ? __pfx_worker_thread (kernel/workqueue.c:2733) [ 426.458717][ T70] ? __pfx_worker_thread (kernel/workqueue.c:2733) [ 426.459031][ T70] kthread (kernel/kthread.c:388) [ 426.459305][ T70] ? __pfx_kthread (kernel/kthread.c:341) [ 426.459593][ T70] ret_from_fork (arch/x86/kernel/process.c:153) [ 426.459858][ T70] ? __pfx_kthread (kernel/kthread.c:341) [ 426.460158][ T70] ret_from_fork_asm (arch/x86/entry/entry_64.S:250) | [ 426.463464][ T70] ------------[ cut here ]------------ | [ 426.463830][ T70] sysfs group 'bridge' not found for kobject 'br0' | [ 426.464322][ T70] WARNING: CPU: 2 PID: 70 at fs/sysfs/group.c:282 sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) | [ 426.464878][ T70] Modules linked in: xt_HL amt udp_tunnel xt_conntrack cls_bpf nft_chain_nat xt_nat nf_nat nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 nft_compat nf_tables libcrc32c act_mirred cls_u32 sch_ingress ifb [ 426.466614][ T70] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014 [ 426.467364][ T70] Workqueue: netns cleanup_net [ 426.467676][ T70] RIP: 0010:sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) [ 426.468035][ 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 a7 fc 9d 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 fc 9d mov $0xffffffff9dfca7a0,%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 [ 426.469239][ T70] RSP: 0018:ffffc9000050fba0 EFLAGS: 00010282 [ 426.469595][ T70] RAX: 0000000000000000 RBX: ffffffff9e3be220 RCX: ffffffff9b31056f [ 426.470065][ T70] RDX: 0000000000000000 RSI: 0000000000000008 RDI: 0000000000000001 [ 426.470489][ T70] RBP: 0000000000000000 R08: 0000000000000000 R09: fffff520000a1f19 [ 426.470913][ T70] R10: ffffc9000050f8cf R11: 205d303754202020 R12: ffff88800ae42628 [ 426.471343][ T70] R13: ffff88800ae42df8 R14: ffffc9000050fc98 R15: ffff88800ae42bc0 [ 426.471817][ T70] FS: 0000000000000000(0000) GS:ffff888035a00000(0000) knlGS:0000000000000000 [ 426.472376][ T70] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 426.472730][ T70] CR2: 0000557d1e789dec CR3: 0000000004f94001 CR4: 00000000001706f0 [ 426.473248][ T70] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 426.473737][ T70] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 426.474263][ T70] Call Trace: [ 426.474466][ T70] [ 426.474628][ T70] ? __warn (kernel/panic.c:677) [ 426.474921][ T70] ? console_trylock (kernel/printk/printk.c:2659 kernel/printk/printk.c:2654) [ 426.475188][ T70] ? sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) [ 426.475467][ T70] ? report_bug (lib/bug.c:201 lib/bug.c:219) [ 426.475753][ T70] ? handle_bug (arch/x86/kernel/traps.c:238) [ 426.476027][ T70] ? exc_invalid_op (arch/x86/kernel/traps.c:259 (discriminator 1)) [ 426.476335][ T70] ? asm_exc_invalid_op (./arch/x86/include/asm/idtentry.h:568) [ 426.476676][ 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) [ 426.476979][ T70] ? sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) [ 426.477289][ T70] br_dev_delete (net/bridge/br_if.c:396) [ 426.477569][ T70] br_net_exit_batch_rtnl (net/bridge/br.c:369) [ 426.477887][ T70] cleanup_net (net/core/net_namespace.c:628 (discriminator 2)) [ 426.478144][ T70] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5719) [ 426.478537][ T70] ? __pfx_cleanup_net (net/core/net_namespace.c:581) [ 426.478835][ T70] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5725) [ 426.479140][ T70] ? process_one_work (kernel/workqueue.c:2609) [ 426.479451][ T70] process_one_work (kernel/workqueue.c:2638) [ 426.479810][ 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) [ 426.480095][ T70] ? __pfx_process_one_work (kernel/workqueue.c:2542) [ 426.480443][ T70] ? assign_work (kernel/workqueue.c:1101) [ 426.480693][ T70] worker_thread (kernel/workqueue.c:2700 kernel/workqueue.c:2787) [ 426.480975][ T70] ? lockdep_hardirqs_on_prepare.part.0 (kernel/locking/lockdep.c:4300 kernel/locking/lockdep.c:4359) [ 426.481373][ T70] ? __pfx_worker_thread (kernel/workqueue.c:2733) [ 426.481673][ T70] ? __pfx_worker_thread (kernel/workqueue.c:2733) [ 426.481993][ T70] kthread (kernel/kthread.c:388) [ 426.482286][ T70] ? __pfx_kthread (kernel/kthread.c:341) [ 426.482566][ T70] ret_from_fork (arch/x86/kernel/process.c:153) [ 426.482835][ 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