BUG: Bad rss-counter state mm:0000000062939678 idx:0 val:8893 BUG: Bad rss-counter state mm:0000000062939678 idx:1 val:549 BUG: non-zero pgtables_bytes on freeing mm: 118784 ================================================================== BUG: KASAN: use-after-free in mm_has_notifiers include/linux/mmu_notifier.h:234 [inline] BUG: KASAN: use-after-free in mmu_notifier_release include/linux/mmu_notifier.h:273 [inline] BUG: KASAN: use-after-free in exit_mmap+0x4a5/0x530 mm/mmap.c:3099 Read of size 8 at addr ffff8880a4cb4898 by task syz-executor.1/14530 CPU: 1 PID: 14530 Comm: syz-executor.1 Not tainted 5.3.0-rc1+ #77 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+0x172/0x1f0 lib/dump_stack.c:113 print_address_description.cold+0xd4/0x306 mm/kasan/report.c:351 __kasan_report.cold+0x1b/0x36 mm/kasan/report.c:482 kasan_report+0x12/0x17 mm/kasan/common.c:612 __asan_report_load8_noabort+0x14/0x20 mm/kasan/generic_report.c:132 mm_has_notifiers include/linux/mmu_notifier.h:234 [inline] mmu_notifier_release include/linux/mmu_notifier.h:273 [inline] exit_mmap+0x4a5/0x530 mm/mmap.c:3099 __mmput kernel/fork.c:1064 [inline] mmput+0x179/0x4d0 kernel/fork.c:1085 vhost_dev_cleanup+0x84e/0xc60 drivers/vhost/vhost.c:964 vhost_vsock_dev_release+0x324/0x470 drivers/vhost/vsock.c:627 __fput+0x2ff/0x890 fs/file_table.c:280 ____fput+0x16/0x20 fs/file_table.c:313 task_work_run+0x145/0x1c0 kernel/task_work.c:113 exit_task_work include/linux/task_work.h:22 [inline] do_exit+0x92f/0x2eb0 kernel/exit.c:878 do_group_exit+0x135/0x360 kernel/exit.c:982 get_signal+0x47c/0x2500 kernel/signal.c:2728 do_signal+0x87/0x1700 arch/x86/kernel/signal.c:815 exit_to_usermode_loop+0x286/0x380 arch/x86/entry/common.c:159 prepare_exit_to_usermode arch/x86/entry/common.c:194 [inline] syscall_return_slowpath arch/x86/entry/common.c:274 [inline] do_syscall_32_irqs_on arch/x86/entry/common.c:347 [inline] do_fast_syscall_32+0xb87/0xdb3 arch/x86/entry/common.c:403 entry_SYSENTER_compat+0x70/0x7f arch/x86/entry/entry_64_compat.S:139 RIP: 0023:0xf7f8e9c9 Code: d3 83 c4 10 5b 5e 5d c3 ba 80 96 98 00 eb a9 8b 04 24 c3 8b 34 24 c3 8b 3c 24 c3 90 90 90 90 90 90 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 eb 0d 90 90 90 90 90 90 90 90 90 90 90 90 RSP: 002b:00000000f5d8a0cc EFLAGS: 00000296 ORIG_RAX: 0000000000000036 RAX: 0000000000000000 RBX: 0000000000000003 RCX: 000000004028af11 RDX: 0000000020000040 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 Allocated by task 10219: save_stack+0x23/0x90 mm/kasan/common.c:69 set_track mm/kasan/common.c:77 [inline] __kasan_kmalloc mm/kasan/common.c:487 [inline] __kasan_kmalloc.constprop.0+0xcf/0xe0 mm/kasan/common.c:460 kasan_slab_alloc+0xf/0x20 mm/kasan/common.c:495 slab_post_alloc_hook mm/slab.h:520 [inline] slab_alloc mm/slab.c:3319 [inline] kmem_cache_alloc+0x121/0x710 mm/slab.c:3483 dup_mm+0x8a/0x1430 kernel/fork.c:1337 copy_mm kernel/fork.c:1402 [inline] copy_process+0x28b7/0x6b00 kernel/fork.c:2017 _do_fork+0x146/0xfa0 kernel/fork.c:2369 __do_compat_sys_x86_clone arch/x86/ia32/sys_ia32.c:253 [inline] __se_compat_sys_x86_clone arch/x86/ia32/sys_ia32.c:236 [inline] __ia32_compat_sys_x86_clone+0x188/0x260 arch/x86/ia32/sys_ia32.c:236 do_syscall_32_irqs_on arch/x86/entry/common.c:332 [inline] do_fast_syscall_32+0x27b/0xdb3 arch/x86/entry/common.c:403 entry_SYSENTER_compat+0x70/0x7f arch/x86/entry/entry_64_compat.S:139 Freed by task 14530: save_stack+0x23/0x90 mm/kasan/common.c:69 set_track mm/kasan/common.c:77 [inline] __kasan_slab_free+0x102/0x150 mm/kasan/common.c:449 kasan_slab_free+0xe/0x10 mm/kasan/common.c:457 __cache_free mm/slab.c:3425 [inline] kmem_cache_free+0x86/0x320 mm/slab.c:3693 __mmdrop+0x238/0x320 kernel/fork.c:683 mmdrop include/linux/sched/mm.h:49 [inline] __khugepaged_exit+0x31f/0x410 mm/khugepaged.c:489 khugepaged_exit include/linux/khugepaged.h:43 [inline] __mmput kernel/fork.c:1063 [inline] mmput+0x402/0x4d0 kernel/fork.c:1085 vhost_dev_cleanup+0x84e/0xc60 drivers/vhost/vhost.c:964 vhost_vsock_dev_release+0x324/0x470 drivers/vhost/vsock.c:627 __fput+0x2ff/0x890 fs/file_table.c:280 ____fput+0x16/0x20 fs/file_table.c:313 task_work_run+0x145/0x1c0 kernel/task_work.c:113 exit_task_work include/linux/task_work.h:22 [inline] do_exit+0x92f/0x2eb0 kernel/exit.c:878 do_group_exit+0x135/0x360 kernel/exit.c:982 get_signal+0x47c/0x2500 kernel/signal.c:2728 do_signal+0x87/0x1700 arch/x86/kernel/signal.c:815 exit_to_usermode_loop+0x286/0x380 arch/x86/entry/common.c:159 prepare_exit_to_usermode arch/x86/entry/common.c:194 [inline] syscall_return_slowpath arch/x86/entry/common.c:274 [inline] do_syscall_32_irqs_on arch/x86/entry/common.c:347 [inline] do_fast_syscall_32+0xb87/0xdb3 arch/x86/entry/common.c:403 entry_SYSENTER_compat+0x70/0x7f arch/x86/entry/entry_64_compat.S:139 The buggy address belongs to the object at ffff8880a4cb4340 which belongs to the cache mm_struct(33:syz1) of size 1496 The buggy address is located 1368 bytes inside of 1496-byte region [ffff8880a4cb4340, ffff8880a4cb4918) The buggy address belongs to the page: page:ffffea0002932d00 refcount:1 mapcount:0 mapping:ffff88808d5dd700 index:0xffff8880a4cb5040 compound_mapcount: 0 flags: 0x1fffc0000010200(slab|head) raw: 01fffc0000010200 ffffea00024e8488 ffff8880a8458a38 ffff88808d5dd700 raw: ffff8880a4cb5040 ffff8880a4cb4340 0000000100000003 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8880a4cb4780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8880a4cb4800: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff8880a4cb4880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8880a4cb4900: fb fb fb fc fc fc fc fc fc fc fc fc fc fc fc fc ffff8880a4cb4980: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb ==================================================================