================================================================== BUG: KASAN: use-after-free in atomic64_set include/asm-generic/atomic-instrumented.h:854 [inline] BUG: KASAN: use-after-free in atomic_long_set include/asm-generic/atomic-long.h:40 [inline] BUG: KASAN: use-after-free in rwsem_set_owner kernel/locking/rwsem.c:176 [inline] BUG: KASAN: use-after-free in __down_write kernel/locking/rwsem.c:1391 [inline] BUG: KASAN: use-after-free in down_write+0xdb/0x150 kernel/locking/rwsem.c:1532 Write of size 8 at addr ffff8880277496e8 by task syz-executor.3/17503 CPU: 1 PID: 17503 Comm: syz-executor.3 Not tainted 5.7.0-syzkaller #0 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+0x188/0x20d lib/dump_stack.c:118 print_address_description.constprop.0.cold+0xd3/0x413 mm/kasan/report.c:383 __kasan_report mm/kasan/report.c:513 [inline] kasan_report.cold+0x1f/0x37 mm/kasan/report.c:530 check_memory_region_inline mm/kasan/generic.c:186 [inline] check_memory_region+0x141/0x190 mm/kasan/generic.c:192 atomic64_set include/asm-generic/atomic-instrumented.h:854 [inline] atomic_long_set include/asm-generic/atomic-long.h:40 [inline] rwsem_set_owner kernel/locking/rwsem.c:176 [inline] __down_write kernel/locking/rwsem.c:1391 [inline] down_write+0xdb/0x150 kernel/locking/rwsem.c:1532 inode_lock include/linux/fs.h:799 [inline] start_creating+0xa8/0x250 fs/debugfs/inode.c:334 __debugfs_create_file+0x62/0x400 fs/debugfs/inode.c:383 kvm_arch_create_vcpu_debugfs+0x52/0x200 arch/x86/kvm/debugfs.c:48 kvm_create_vcpu_debugfs arch/x86/kvm/../../../virt/kvm/kvm_main.c:3012 [inline] kvm_vm_ioctl_create_vcpu arch/x86/kvm/../../../virt/kvm/kvm_main.c:3089 [inline] kvm_vm_ioctl+0x1c0b/0x2440 arch/x86/kvm/../../../virt/kvm/kvm_main.c:3617 vfs_ioctl fs/ioctl.c:47 [inline] ksys_ioctl+0x11a/0x180 fs/ioctl.c:771 __do_sys_ioctl fs/ioctl.c:780 [inline] __se_sys_ioctl fs/ioctl.c:778 [inline] __x64_sys_ioctl+0x6f/0xb0 fs/ioctl.c:778 do_syscall_64+0xf6/0x7d0 arch/x86/entry/common.c:295 entry_SYSCALL_64_after_hwframe+0x49/0xb3 RIP: 0033:0x45ca69 Code: 0d b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 db b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f40f5451c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00000000004e7400 RCX: 000000000045ca69 RDX: 0000000000000000 RSI: 000000000000ae41 RDI: 0000000000000005 RBP: 000000000078bfa0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 0000000000000396 R14: 00000000004c6306 R15: 00007f40f54526d4 Allocated by task 17503: save_stack+0x1b/0x40 mm/kasan/common.c:48 set_track mm/kasan/common.c:56 [inline] __kasan_kmalloc mm/kasan/common.c:494 [inline] __kasan_kmalloc.constprop.0+0xbf/0xd0 mm/kasan/common.c:467 slab_post_alloc_hook mm/slab.h:586 [inline] slab_alloc mm/slab.c:3320 [inline] kmem_cache_alloc+0x11b/0x740 mm/slab.c:3484 alloc_inode+0x164/0x1e0 fs/inode.c:234 new_inode_pseudo+0x14/0xe0 fs/inode.c:928 new_inode+0x1b/0x40 fs/inode.c:957 debugfs_get_inode+0x1a/0x130 fs/debugfs/inode.c:67 debugfs_create_dir+0x71/0x390 fs/debugfs/inode.c:544 kvm_create_vcpu_debugfs arch/x86/kvm/../../../virt/kvm/kvm_main.c:3009 [inline] kvm_vm_ioctl_create_vcpu arch/x86/kvm/../../../virt/kvm/kvm_main.c:3089 [inline] kvm_vm_ioctl+0x1bd8/0x2440 arch/x86/kvm/../../../virt/kvm/kvm_main.c:3617 vfs_ioctl fs/ioctl.c:47 [inline] ksys_ioctl+0x11a/0x180 fs/ioctl.c:771 __do_sys_ioctl fs/ioctl.c:780 [inline] __se_sys_ioctl fs/ioctl.c:778 [inline] __x64_sys_ioctl+0x6f/0xb0 fs/ioctl.c:778 do_syscall_64+0xf6/0x7d0 arch/x86/entry/common.c:295 entry_SYSCALL_64_after_hwframe+0x49/0xb3 Freed by task 2478: save_stack+0x1b/0x40 mm/kasan/common.c:48 set_track mm/kasan/common.c:56 [inline] kasan_set_free_info mm/kasan/common.c:316 [inline] __kasan_slab_free+0xf7/0x140 mm/kasan/common.c:455 __cache_free mm/slab.c:3426 [inline] kmem_cache_free+0x7f/0x320 mm/slab.c:3694 i_callback+0x3f/0x70 fs/inode.c:221 rcu_do_batch kernel/rcu/tree.c:2396 [inline] rcu_core+0x59f/0x1370 kernel/rcu/tree.c:2623 __do_softirq+0x26c/0x9f7 kernel/softirq.c:292 The buggy address belongs to the object at ffff888027749600 which belongs to the cache inode_cache of size 1024 The buggy address is located 232 bytes inside of 1024-byte region [ffff888027749600, ffff888027749a00) The buggy address belongs to the page: page:ffffea00009dd240 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff888027749ffd flags: 0xfffe0000000200(slab) raw: 00fffe0000000200 ffffea0001412e48 ffffea00009db2c8 ffff8880aa201380 raw: ffff888027749ffd ffff888027749180 0000000100000003 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff888027749580: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888027749600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff888027749680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888027749700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888027749780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================