================================================================== BUG: KASAN: stack-out-of-bounds in unwind_next_frame+0x169f/0x1810 arch/x86/kernel/unwind_orc.c:470 Read of size 8 at addr ffff8881db8076f8 by task syz-executor851/2477 CPU: 0 PID: 2477 Comm: syz-executor851 Not tainted 4.14.153+ #0 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0xca/0x134 lib/dump_stack.c:53 print_address_description+0x60/0x226 mm/kasan/report.c:187 __kasan_report.cold+0x1a/0x41 mm/kasan/report.c:316 unwind_next_frame+0x169f/0x1810 arch/x86/kernel/unwind_orc.c:470 perf_callchain_kernel+0x3a0/0x540 arch/x86/events/core.c:2338 get_perf_callchain+0x2f5/0x770 kernel/events/callchain.c:217 perf_callchain+0x147/0x190 kernel/events/callchain.c:190 perf_prepare_sample+0x6a8/0x1360 kernel/events/core.c:6148 __perf_event_output kernel/events/core.c:6264 [inline] perf_event_output_forward+0xdc/0x220 kernel/events/core.c:6282 __perf_event_overflow+0x12d/0x340 kernel/events/core.c:7520 perf_swevent_overflow+0x7a/0xf0 kernel/events/core.c:7596 perf_swevent_event+0x112/0x270 kernel/events/core.c:7634 perf_tp_event+0x633/0x7f0 kernel/events/core.c:8058 perf_trace_run_bpf_submit kernel/events/core.c:8028 [inline] perf_trace_run_bpf_submit+0x113/0x170 kernel/events/core.c:8014 perf_trace_lock_acquire+0x341/0x4e0 include/trace/events/lock.h:13 trace_lock_acquire include/trace/events/lock.h:13 [inline] lock_acquire+0x279/0x360 kernel/locking/lockdep.c:3993 rcu_lock_acquire include/linux/rcupdate.h:242 [inline] rcu_read_lock include/linux/rcupdate.h:629 [inline] sk_filter_trim_cap net/core/filter.c:95 [inline] sk_filter_trim_cap+0x18e/0x7f0 net/core/filter.c:73 sk_filter include/linux/filter.h:725 [inline] sock_queue_rcv_skb+0x20/0x50 net/core/sock.c:479 packet_rcv_spkt+0x39e/0x4d0 net/packet/af_packet.c:1884 deliver_skb net/core/dev.c:1881 [inline] deliver_ptype_list_skb net/core/dev.c:1896 [inline] __netif_receive_skb_core+0xa71/0x2cf0 net/core/dev.c:4460 __netif_receive_skb+0x66/0x210 net/core/dev.c:4515 netif_receive_skb_internal+0x11f/0x5f0 net/core/dev.c:4588 napi_skb_finish net/core/dev.c:4949 [inline] napi_gro_receive+0x206/0x410 net/core/dev.c:4980 receive_buf+0x4fc/0x4300 drivers/net/virtio_net.c:852 virtnet_receive drivers/net/virtio_net.c:1098 [inline] virtnet_poll+0x4e6/0x9f0 drivers/net/virtio_net.c:1189 napi_poll net/core/dev.c:5598 [inline] net_rx_action+0x366/0xcd0 net/core/dev.c:5664 __do_softirq+0x234/0x9ec kernel/softirq.c:288 invoke_softirq kernel/softirq.c:368 [inline] irq_exit+0x114/0x150 kernel/softirq.c:409 exiting_irq arch/x86/include/asm/apic.h:648 [inline] do_IRQ+0x104/0x1c0 arch/x86/kernel/irq.c:242 common_interrupt+0x8c/0x8c arch/x86/entry/entry_64.S:576 RIP: 0010:__raw_spin_unlock_irq include/linux/spinlock_api_smp.h:169 [inline] RIP: 0010:_raw_spin_unlock_irq+0x2b/0x50 kernel/locking/spinlock.c:200 RSP: 0018:ffff8881ce26f290 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff6e RAX: 0000000000000007 RBX: 0000000000000001 RCX: 1ffff11039c3510a RDX: 0000000000000000 RSI: ffff8881ce1a8858 RDI: ffff8881ce1a882c RBP: ffff8881db829240 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: ffff8881db829240 R13: ffff8881ce36de00 R14: 0000000000000000 R15: ffff8881ce1a8000 finish_lock_switch kernel/sched/sched.h:1491 [inline] finish_task_switch+0x204/0x660 kernel/sched/core.c:2734 context_switch kernel/sched/core.c:2870 [inline] __schedule+0x894/0x1f80 kernel/sched/core.c:3455 preempt_schedule_irq+0x5e/0xa0 kernel/sched/core.c:3682 retint_kernel+0x1b/0x2d RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:779 [inline] RIP: 0010:lock_acquire+0x170/0x360 kernel/locking/lockdep.c:3997 RSP: 0018:ffff8881ce26f4a8 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff02 RAX: 0000000000000007 RBX: ffff8881ce1a8000 RCX: 1ffff11039c3510f RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000246 RBP: ffffffff972d4ee0 R08: 0000000000000000 R09: 0000000000000001 R10: ffff8881ce1a8858 R11: be6bad34bd2590a9 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000002 R15: 0000000000000000 rcu_lock_acquire include/linux/rcupdate.h:242 [inline] rcu_read_lock include/linux/rcupdate.h:629 [inline] __is_insn_slot_addr+0x3d/0x1e0 kernel/kprobes.c:293 is_kprobe_insn_slot include/linux/kprobes.h:318 [inline] kernel_text_address+0xfe/0x120 kernel/extable.c:148 __kernel_text_address+0x9/0x30 kernel/extable.c:105 unwind_get_return_address arch/x86/kernel/unwind_orc.c:255 [inline] unwind_get_return_address+0x51/0x90 arch/x86/kernel/unwind_orc.c:250 __save_stack_trace+0x8a/0xf0 arch/x86/kernel/stacktrace.c:45 save_stack mm/kasan/common.c:76 [inline] set_track mm/kasan/common.c:85 [inline] __kasan_slab_free+0x164/0x210 mm/kasan/common.c:463 slab_free_hook mm/slub.c:1407 [inline] slab_free_freelist_hook mm/slub.c:1458 [inline] slab_free mm/slub.c:3039 [inline] kmem_cache_free+0xd7/0x3b0 mm/slub.c:3055 anon_vma_chain_free mm/rmap.c:134 [inline] unlink_anon_vmas+0x284/0x7e0 mm/rmap.c:401 free_pgtables+0xab/0x1c0 mm/memory.c:643 exit_mmap+0x222/0x440 mm/mmap.c:3078 __mmput kernel/fork.c:940 [inline] mmput+0xeb/0x370 kernel/fork.c:961 exit_mm kernel/exit.c:545 [inline] do_exit+0x905/0x2a20 kernel/exit.c:862 do_group_exit+0x100/0x2e0 kernel/exit.c:978 get_signal+0x39f/0x1cc0 kernel/signal.c:2422 do_signal+0x96/0x15d0 arch/x86/kernel/signal.c:814 exit_to_usermode_loop+0x11d/0x160 arch/x86/entry/common.c:160 prepare_exit_to_usermode arch/x86/entry/common.c:199 [inline] syscall_return_slowpath arch/x86/entry/common.c:270 [inline] do_syscall_64+0x3a3/0x520 arch/x86/entry/common.c:297 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x446a09 RSP: 002b:00007f6522d15d98 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: fffffffffffffe00 RBX: 00000000006dbc38 RCX: 0000000000446a09 RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00000000006dbc38 RBP: 00000000006dbc30 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000006dbc3c R13: 0000000000000000 R14: 00000030656c6966 R15: 2f30656c69662f2e The buggy address belongs to the page: page:ffffea00076e01c0 count:1 mapcount:0 mapping: (null) index:0x0 flags: 0x4000000000001000(reserved) raw: 4000000000001000 0000000000000000 0000000000000000 00000001ffffffff raw: ffffea00076e01e0 ffffea00076e01e0 0000000000000000 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8881db807580: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff8881db807600: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff8881db807680: 00 00 00 00 00 00 f1 f1 f1 f1 f1 f1 04 f2 00 f3 ^ ffff8881db807700: f3 f3 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff8881db807780: 00 00 00 00 00 00 00 00 00 00 00 00 00 f1 f1 f1 ==================================================================