================================================================== BUG: KASAN: use-after-free in __list_del_entry_valid+0xd0/0xf3 lib/list_debug.c:42 Read of size 8 at addr ffff88808ef3b220 by task swapper/0/0 CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.1.0-rc1+ #1 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x113/0x167 lib/dump_stack.c:113 print_address_description.cold.5+0x9/0x1ff mm/kasan/report.c:187 kasan_report.cold.6+0x1b/0x39 mm/kasan/report.c:317 __asan_report_load8_noabort+0x14/0x20 mm/kasan/generic_report.c:132 __list_del_entry_valid+0xd0/0xf3 lib/list_debug.c:42 __list_del_entry include/linux/list.h:117 [inline] list_del_init include/linux/list.h:159 [inline] snd_timer_process_callbacks+0x100/0x2a0 sound/core/timer.c:744 snd_timer_interrupt+0x79d/0xdd0 sound/core/timer.c:862 snd_hrtimer_callback+0x1be/0x380 sound/core/hrtimer.c:64 __run_hrtimer kernel/time/hrtimer.c:1389 [inline] __hrtimer_run_queues+0x2f9/0xab0 kernel/time/hrtimer.c:1451 hrtimer_interrupt+0x2df/0x760 kernel/time/hrtimer.c:1509 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1035 [inline] smp_apic_timer_interrupt+0x120/0x550 arch/x86/kernel/apic/apic.c:1060 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:807 RIP: 0010:native_safe_halt+0x6/0x10 arch/x86/include/asm/irqflags.h:58 Code: e9 62 ff ff ff 48 89 c7 48 89 45 d8 e8 a3 05 ff fa 48 8b 45 d8 e9 17 ff ff ff 4c 89 e7 e8 92 05 ff fa eb 93 55 48 89 e5 fb f4 <5d> c3 0f 1f 84 00 00 00 00 00 55 48 89 e5 f4 5d c3 90 90 90 90 90 RSP: 0018:ffffffff88007ce8 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13 RAX: dffffc0000000000 RBX: ffffffff8807dfc0 RCX: 0000000000000000 RDX: 1ffffffff1024839 RSI: 0000000000000006 RDI: ffffffff881241c8 RBP: ffffffff88007ce8 R08: 0000000000000006 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: ffffffff881241b8 R14: 0000000000000000 R15: ffffffff88d3df20 arch_safe_halt arch/x86/include/asm/paravirt.h:156 [inline] default_idle+0x51/0x320 arch/x86/kernel/process.c:576 arch_cpu_idle+0x10/0x20 arch/x86/kernel/process.c:567 default_idle_call+0x6d/0x90 kernel/sched/idle.c:93 cpuidle_idle_call kernel/sched/idle.c:153 [inline] do_idle+0x3f1/0x5b0 kernel/sched/idle.c:262 cpu_startup_entry+0x18/0x20 kernel/sched/idle.c:353 rest_init+0x1a4/0x279 init/main.c:450 arch_call_rest_init+0x9/0xc start_kernel+0x6ae/0x6e7 init/main.c:747 x86_64_start_reservations+0x29/0x2b arch/x86/kernel/head64.c:470 x86_64_start_kernel+0x76/0x79 arch/x86/kernel/head64.c:451 secondary_startup_64+0xa4/0xb0 arch/x86/kernel/head_64.S:243 Allocated by task 7042: save_stack+0x43/0xd0 mm/kasan/common.c:75 set_track mm/kasan/common.c:87 [inline] __kasan_kmalloc.constprop.9+0xc7/0xd0 mm/kasan/common.c:497 kasan_kmalloc+0x9/0x10 mm/kasan/common.c:511 kmem_cache_alloc_trace+0x154/0x750 mm/slab.c:3621 kmalloc include/linux/slab.h:545 [inline] kzalloc include/linux/slab.h:740 [inline] snd_timer_instance_new+0x4d/0x370 sound/core/timer.c:108 snd_timer_open+0x780/0x1690 sound/core/timer.c:312 snd_seq_timer_open+0x20c/0x550 sound/core/seq/seq_timer.c:290 queue_use+0x6a/0x170 sound/core/seq/seq_queue.c:502 snd_seq_queue_alloc+0x295/0x4d0 sound/core/seq/seq_queue.c:189 snd_seq_ioctl_create_queue+0xaa/0x2e0 sound/core/seq/seq_clientmgr.c:1522 snd_seq_ioctl+0x1cc/0x3c0 sound/core/seq/seq_clientmgr.c:2138 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:509 [inline] do_vfs_ioctl+0x199/0x10d0 fs/ioctl.c:696 ksys_ioctl+0x62/0x90 fs/ioctl.c:713 __do_sys_ioctl fs/ioctl.c:720 [inline] __se_sys_ioctl fs/ioctl.c:718 [inline] __x64_sys_ioctl+0x6e/0xb0 fs/ioctl.c:718 do_syscall_64+0xd6/0x4e0 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 7042: save_stack+0x43/0xd0 mm/kasan/common.c:75 set_track mm/kasan/common.c:87 [inline] __kasan_slab_free+0x102/0x150 mm/kasan/common.c:459 kasan_slab_free+0xe/0x10 mm/kasan/common.c:467 __cache_free mm/slab.c:3498 [inline] kfree+0xcf/0x230 mm/slab.c:3821 snd_timer_close_locked+0x6ac/0xaa0 sound/core/timer.c:399 snd_timer_close+0x23/0x40 sound/core/timer.c:424 snd_seq_timer_close+0x7d/0xa0 sound/core/seq/seq_timer.c:329 queue_delete+0x49/0xa0 sound/core/seq/seq_queue.c:147 snd_seq_queue_client_leave+0x27/0x110 sound/core/seq/seq_queue.c:584 seq_free_client1.part.9+0xef/0x260 sound/core/seq/seq_clientmgr.c:263 seq_free_client1 sound/core/seq/seq_clientmgr.c:256 [inline] seq_free_client+0x5c/0xd0 sound/core/seq/seq_clientmgr.c:285 snd_seq_release+0x48/0xe0 sound/core/seq/seq_clientmgr.c:366 __fput+0x252/0x800 fs/file_table.c:278 ____fput+0x9/0x10 fs/file_table.c:309 task_work_run+0x10e/0x190 kernel/task_work.c:113 get_signal+0x1222/0x1840 kernel/signal.c:2390 do_signal+0x87/0x1930 arch/x86/kernel/signal.c:816 exit_to_usermode_loop+0x114/0x200 arch/x86/entry/common.c:162 prepare_exit_to_usermode arch/x86/entry/common.c:197 [inline] syscall_return_slowpath arch/x86/entry/common.c:268 [inline] do_syscall_64+0x40d/0x4e0 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe The buggy address belongs to the object at ffff88808ef3b180 which belongs to the cache kmalloc-256 of size 256 The buggy address is located 160 bytes inside of 256-byte region [ffff88808ef3b180, ffff88808ef3b280) The buggy address belongs to the page: page:ffffea00023bcec0 count:1 mapcount:0 mapping:ffff88812c3267c0 index:0x0 flags: 0x1fffc0000000200(slab) raw: 01fffc0000000200 ffffea000233b288 ffffea000295eec8 ffff88812c3267c0 raw: 0000000000000000 ffff88808ef3b040 000000010000000c 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff88808ef3b100: 00 00 fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88808ef3b180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88808ef3b200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88808ef3b280: fc fc fc fc fc fc fc fc 00 00 00 00 00 00 00 00 ffff88808ef3b300: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ==================================================================