WARNING: can't dereference registers at ffffffffba402330 for ip apic_timer_interrupt+0x84/0x90 arch/x86/entry/entry_64.S:787 ================================================================== BUG: KASAN: stack-out-of-bounds in deref_stack_regs arch/x86/kernel/unwind_orc.c:290 [inline] BUG: KASAN: stack-out-of-bounds in unwind_next_frame+0x1595/0x1930 arch/x86/kernel/unwind_orc.c:420 Read of size 8 at addr ffff8881dba07ce0 by task syz-executor0/4676 CPU: 0 PID: 4676 Comm: syz-executor0 Not tainted 4.14.90+ #29 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0xb9/0x11b lib/dump_stack.c:53 print_address_description+0x60/0x22b mm/kasan/report.c:252 kasan_report_error mm/kasan/report.c:351 [inline] kasan_report.cold.6+0x11b/0x2dd mm/kasan/report.c:409 deref_stack_regs arch/x86/kernel/unwind_orc.c:290 [inline] unwind_next_frame+0x1595/0x1930 arch/x86/kernel/unwind_orc.c:420 perf_callchain_kernel+0x39c/0x540 arch/x86/events/core.c:2334 get_perf_callchain+0x2eb/0x760 kernel/events/callchain.c:217 perf_callchain+0x14a/0x190 kernel/events/callchain.c:190 perf_prepare_sample+0x704/0x13c0 kernel/events/core.c:6140 __perf_event_output kernel/events/core.c:6256 [inline] perf_event_output_forward+0xeb/0x230 kernel/events/core.c:6274 __perf_event_overflow+0x116/0x320 kernel/events/core.c:7510 perf_swevent_overflow+0x166/0x1f0 kernel/events/core.c:7586 perf_swevent_event+0x112/0x270 kernel/events/core.c:7624 perf_tp_event+0x620/0x7e0 kernel/events/core.c:8048 perf_trace_run_bpf_submit+0x10f/0x170 kernel/events/core.c:8018 perf_trace_lock+0x2f6/0x4c0 include/trace/events/lock.h:39 trace_lock_release include/trace/events/lock.h:58 [inline] lock_release+0x4dc/0x720 kernel/locking/lockdep.c:4009 __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:158 [inline] _raw_spin_unlock_irqrestore+0x1b/0x70 kernel/locking/spinlock.c:192 debug_object_deactivate+0x214/0x340 lib/debugobjects.c:530 debug_rcu_head_unqueue kernel/rcu/rcu.h:164 [inline] rcu_do_batch kernel/rcu/tree.c:2690 [inline] invoke_rcu_callbacks kernel/rcu/tree.c:2954 [inline] __rcu_process_callbacks kernel/rcu/tree.c:2921 [inline] rcu_process_callbacks+0x60f/0xee0 kernel/rcu/tree.c:2938 __do_softirq+0x20d/0x9bd kernel/softirq.c:288 invoke_softirq kernel/softirq.c:368 [inline] irq_exit+0x117/0x150 kernel/softirq.c:409 exiting_irq arch/x86/include/asm/apic.h:648 [inline] smp_apic_timer_interrupt+0x18c/0x600 arch/x86/kernel/apic/apic.c:1064 apic_timer_interrupt+0x84/0x90 arch/x86/entry/entry_64.S:787 RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:778 [inline] RIP: 0010:lock_release+0x3d0/0x720 kernel/locking/lockdep.c:4013 RSP: 0018:ffff88817fd178b8 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff10 RAX: 0000000000000007 RBX: 1ffff1102ffa2f1a RCX: 1ffff110398579d4 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000246 RBP: ffff8881cc2bc680 R08: 0000000000000001 R09: 0000000000000001 R10: ffff88817fd17738 R11: ffff88817fd1704f R12: 0000000000000000 R13: ffff8881cc2bcea8 R14: 0000000000000000 R15: ffff8881cc2bc680 rcu_lock_release include/linux/rcupdate.h:249 [inline] rcu_read_unlock include/linux/rcupdate.h:687 [inline] __is_insn_slot_addr+0x139/0x1f0 kernel/kprobes.c:301 is_kprobe_insn_slot include/linux/kprobes.h:317 [inline] kernel_text_address+0x10b/0x120 kernel/extable.c:148 __kernel_text_address+0x9/0x30 kernel/extable.c:105 unwind_get_return_address+0x51/0x90 arch/x86/kernel/unwind_orc.c:238 __save_stack_trace+0x8d/0xf0 arch/x86/kernel/stacktrace.c:45 save_stack mm/kasan/kasan.c:447 [inline] set_track mm/kasan/kasan.c:459 [inline] kasan_kmalloc.part.1+0x4f/0xd0 mm/kasan/kasan.c:551 slab_post_alloc_hook mm/slab.h:442 [inline] slab_alloc_node mm/slub.c:2723 [inline] slab_alloc mm/slub.c:2731 [inline] kmem_cache_alloc+0xe4/0x2b0 mm/slub.c:2736 kmem_cache_zalloc include/linux/slab.h:651 [inline] inode_alloc_security security/selinux/hooks.c:234 [inline] selinux_inode_alloc_security+0xab/0x290 security/selinux/hooks.c:2885 security_inode_alloc+0x95/0xd0 security/security.c:439 inode_init_always+0x4a1/0xa20 fs/inode.c:167 alloc_inode+0x7b/0x170 fs/inode.c:216 new_inode_pseudo+0x12/0xd0 fs/inode.c:891 new_inode+0x18/0x40 fs/inode.c:920 shmem_get_inode+0x6f/0x6c0 mm/shmem.c:2191 __shmem_file_setup.part.14+0x122/0x3f0 mm/shmem.c:4277 __shmem_file_setup mm/shmem.c:4259 [inline] shmem_file_setup mm/shmem.c:4326 [inline] SYSC_memfd_create mm/shmem.c:3779 [inline] SyS_memfd_create+0x1ba/0x310 mm/shmem.c:3719 do_syscall_64+0x19b/0x4b0 arch/x86/entry/common.c:289 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x4579b9 RSP: 002b:00007fe7d84dda88 EFLAGS: 00000246 ORIG_RAX: 000000000000013f RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00000000004579b9 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00000000004bcb93 RBP: 000000000073bf00 R08: 0000000001008082 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007fe7d84de6d4 R13: 00000000004c5f27 R14: 00000000004dace0 R15: 00000000ffffffff The buggy address belongs to the page: page:ffffea00076e81c0 count:1 mapcount:0 mapping: (null) index:0x0 flags: 0x4000000000000800(reserved) raw: 4000000000000800 0000000000000000 0000000000000000 00000001ffffffff raw: ffffea00076e81e0 ffffea00076e81e0 0000000000000000 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8881dba07b80: 00 00 00 00 00 00 00 00 00 00 00 00 f1 f1 f1 f1 ffff8881dba07c00: 04 f2 f2 f2 f2 f2 f2 f2 00 f2 f2 f2 00 00 00 00 >ffff8881dba07c80: 00 00 00 00 00 00 00 00 00 00 f1 f1 f1 f1 04 f2 ^ ffff8881dba07d00: f2 f2 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff8881dba07d80: 00 00 f1 f1 f1 f1 00 00 00 00 00 f2 f2 f2 00 00 ==================================================================