Debian GNU/Linux 11 syzkaller ttyS0 syzkaller login: [ 34.176666] BUG: Bad rss-counter state mm:0000000031f28e85 type:MM_FILEPAGES val:33 [ 34.177847] BUG: Bad rss-counter state mm:0000000031f28e85 type:MM_ANONPAGES val:22 [ 34.217476] ================================================================== [ 34.218706] BUG: KASAN: slab-use-after-free in vma_interval_tree_remove+0xc75/0xec0 [ 34.220199] Read of size 8 at addr ffff8880147df058 by task sshd/219 [ 34.221133] [ 34.221394] CPU: 1 PID: 219 Comm: sshd Not tainted 6.4.0-rc7-next-20230619 #1 [ 34.222441] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014 [ 34.223590] Call Trace: [ 34.223970] [ 34.224308] dump_stack_lvl+0x91/0xf0 [ 34.224888] print_report+0xcc/0x620 [ 34.225457] ? __virt_addr_valid+0x102/0x340 [ 34.226105] ? vma_interval_tree_remove+0xc75/0xec0 [ 34.226856] ? vma_interval_tree_remove+0xc75/0xec0 [ 34.227559] kasan_report+0xbe/0xf0 [ 34.228056] ? vma_interval_tree_remove+0xc75/0xec0 [ 34.228701] vma_interval_tree_remove+0xc75/0xec0 [ 34.229308] vma_prepare+0xc54/0x11a0 [ 34.229800] __split_vma+0x5af/0x950 [ 34.230276] ? __pfx___split_vma+0x10/0x10 [ 34.230830] ? find_held_lock+0x2c/0x110 [ 34.231365] do_vmi_align_munmap+0x2ba/0x11f0 [ 34.231930] ? lock_is_held_type+0x9f/0x120 [ 34.232470] ? __pfx_do_vmi_align_munmap+0x10/0x10 [ 34.233074] ? mtree_range_walk+0x632/0x900 [ 34.233621] ? mas_walk+0x5c7/0x7c0 [ 34.234097] do_vmi_munmap+0x1f1/0x2b0 [ 34.234614] mmap_region+0x1f9/0x2660 [ 34.235097] ? vm_mmap_pgoff+0x15c/0x3a0 [ 34.235613] ? __pfx_arch_get_unmapped_area_topdown+0x10/0x10 [ 34.236337] ? __pfx_lock_acquire+0x10/0x10 [ 34.236869] ? __pfx_mmap_region+0x10/0x10 [ 34.237402] ? security_mmap_addr+0x7d/0xa0 [ 34.237939] ? get_unmapped_area+0x1f5/0x3f0 [ 34.238498] do_mmap+0x854/0xf00 [ 34.238943] vm_mmap_pgoff+0x1a6/0x3a0 [ 34.239443] ? __pfx_vm_mmap_pgoff+0x10/0x10 [ 34.240005] ksys_mmap_pgoff+0x3af/0x500 [ 34.240515] do_syscall_64+0x3f/0x90 [ 34.240991] entry_SYSCALL_64_after_hwframe+0x6e/0xd8 [ 34.241657] RIP: 0033:0x7fd2d8e62d82 [ 34.242114] Code: eb aa 66 0f 1f 44 00 00 41 f7 c1 ff 0f 00 00 75 27 55 48 89 fd 53 89 cb 48 85 ff 74 33 41 89 da 48 89 ef b8 09 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 56 5b 5d c3 0f 1f 00 c7 05 ae 03 01 00 16 00 [ 34.244234] RSP: 002b:00007fff83247848 EFLAGS: 00000206 ORIG_RAX: 0000000000000009 [ 34.245135] RAX: ffffffffffffffda RBX: 0000000000000812 RCX: 00007fd2d8e62d82 [ 34.245974] RDX: 0000000000000005 RSI: 0000000000001000 RDI: 00007fd2d829c000 [ 34.246839] RBP: 00007fd2d829c000 R08: 0000000000000009 R09: 0000000000001000 [ 34.247701] R10: 0000000000000812 R11: 0000000000000206 R12: 000055805af7af70 [ 34.248563] R13: 00007fff83247860 R14: 00007fff83247890 R15: 00007fff83247bf0 [ 34.249425] [ 34.249717] [ 34.249930] Allocated by task 212: [ 34.250356] kasan_save_stack+0x22/0x50 [ 34.250869] kasan_set_track+0x25/0x30 [ 34.251359] __kasan_slab_alloc+0x59/0x70 [ 34.251882] kmem_cache_alloc+0x16b/0x370 [ 34.252398] vm_area_dup+0x20/0x160 [ 34.252859] __split_vma+0x170/0x950 [ 34.253322] split_vma+0xc6/0x110 [ 34.253758] mprotect_fixup+0x8d2/0xb30 [ 34.254259] do_mprotect_pkey+0x87e/0xd40 [ 34.254797] __x64_sys_mprotect+0x78/0xc0 [ 34.255313] do_syscall_64+0x3f/0x90 [ 34.255782] entry_SYSCALL_64_after_hwframe+0x6e/0xd8 [ 34.256422] [ 34.256639] Freed by task 212: [ 34.257031] kasan_save_stack+0x22/0x50 [ 34.257545] kasan_set_track+0x25/0x30 [ 34.258039] kasan_save_free_info+0x2b/0x50 [ 34.258595] __kasan_slab_free+0x10a/0x190 [ 34.259123] kmem_cache_free+0x10d/0x4d0 [ 34.259632] rcu_core+0x8c8/0x2860 [ 34.260072] __do_softirq+0x1b7/0x7d4 [ 34.260549] [ 34.260767] Last potentially related work creation: [ 34.261357] kasan_save_stack+0x22/0x50 [ 34.261862] __kasan_record_aux_stack+0x8e/0xa0 [ 34.262443] __call_rcu_common.constprop.0+0x6a/0xb90 [ 34.263146] remove_vma+0x139/0x170 [ 34.263597] do_vmi_align_munmap+0xd4a/0x11f0 [ 34.264149] do_vmi_munmap+0x1f1/0x2b0 [ 34.264628] __vm_munmap+0x138/0x3a0 [ 34.265093] __x64_sys_munmap+0x59/0x80 [ 34.265591] do_syscall_64+0x3f/0x90 [ 34.266063] entry_SYSCALL_64_after_hwframe+0x6e/0xd8 [ 34.266723] [ 34.266937] The buggy address belongs to the object at ffff8880147df000 [ 34.266937] which belongs to the cache vm_area_struct of size 168 [ 34.268399] The buggy address is located 88 bytes inside of [ 34.268399] freed 168-byte region [ffff8880147df000, ffff8880147df0a8) [ 34.269795] [ 34.270011] The buggy address belongs to the physical page: [ 34.270681] page:00000000c2d6007f refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x147df [ 34.271769] memcg:ffff888015f30001 [ 34.272191] flags: 0x100000000000200(slab|node=0|zone=1) [ 34.272858] page_type: 0xffffffff() [ 34.273307] raw: 0100000000000200 ffff88800879fc80 dead000000000122 0000000000000000 [ 34.274251] raw: 0000000000000000 0000000000110011 00000001ffffffff ffff888015f30001 [ 34.275220] page dumped because: kasan: bad access detected [ 34.275889] [ 34.276105] Memory state around the buggy address: [ 34.276693] ffff8880147def00: fb fb fb fb fb fb fc fc fc fc fc fc fc fc fc fc [ 34.277567] ffff8880147def80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 34.278445] >ffff8880147df000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 34.279321] ^ [ 34.280066] ffff8880147df080: fb fb fb fb fb fc fc fc fc fc fc fc fc fa fb fb [ 34.280930] ffff8880147df100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 34.281785] ================================================================== [ 34.282794] Disabling lock debugging due to kernel taint [ 36.854914] BUG: Bad rss-counter state mm:000000007ec0ffb4 type:MM_FILEPAGES val:33 [ 36.856094] BUG: Bad rss-counter state mm:000000007ec0ffb4 type:MM_ANONPAGES val:22 [ 37.334378] BUG: Bad rss-counter state mm:000000006c339742 type:MM_FILEPAGES val:33 [ 37.335567] BUG: Bad rss-counter state mm:000000006c339742 type:MM_ANONPAGES val:22 Warning: Permanently added '[localhost]:18872' (ECDSA) to the list of known hosts. 2023/06/20 03:07:20 fuzzer started 2023/06/20 03:07:21 dialing manager at localhost:44161 2023/06/20 03:07:21 checking machine... 2023/06/20 03:07:21 checking revisions... [ 38.061180] kmemleak: Automatic memory scanning thread ended 2023/06/20 03:07:21 testing simple program... [ 38.113822] cgroup: Unknown subsys name 'net' [ 38.154583] cgroup: Unknown subsys name 'rlimit' executing program executing program executing program VM DIAGNOSIS: 03:07:17 Registers: info registers vcpu 0 RAX=0000000000000050 RBX=ffff88800bbb8000 RCX=0000000000000000 RDX=00000000000101f7 RSI=ffffffff821920cb RDI=0000000000000007 RBP=00000000000003e7 RSP=ffff88800ba677d8 R8 =0000000000000007 R9 =0000000000010000 R10=00000000000101f7 R11=0000000000000128 R12=00000000000101f7 R13=ffffed1001777001 R14=ffffffff85a237a0 R15=dffffc0000000000 RIP=ffffffff821920cf RFL=00000093 [--S-A-C] CPL=0 II=0 A20=1 SMM=0 HLT=0 ES =0000 0000000000000000 00000000 00000000 CS =0010 0000000000000000 ffffffff 00a09b00 DPL=0 CS64 [-RA] SS =0018 0000000000000000 ffffffff 00c09300 DPL=0 DS [-WA] DS =0000 0000000000000000 00000000 00000000 FS =0000 0000000000000000 00000000 00000000 GS =0000 ffff88806ce00000 00000000 00000000 LDT=0000 fffffe0000000000 00000000 00000000 TR =0040 fffffe0000003000 00004087 00008b00 DPL=0 TSS64-busy GDT= fffffe0000001000 0000007f IDT= fffffe0000000000 00000fff CR0=80050033 CR2=00007ff66d4bc0b0 CR3=0000000008f70000 CR4=00350ef0 DR0=0000000000000000 DR1=0000000000000000 DR2=0000000000000000 DR3=0000000000000000 DR6=00000000ffff0ff0 DR7=0000000000000400 EFER=0000000000000d01 FCW=037f FSW=0000 [ST=0] FTW=00 MXCSR=00001f80 FPR0=0000000000000000 0000 FPR1=0000000000000000 0000 FPR2=0000000000000000 0000 FPR3=0000000000000000 0000 FPR4=0000000000000000 0000 FPR5=0000000000000000 0000 FPR6=0000000000000000 0000 FPR7=0000000000000000 0000 XMM00=00000000000000000000000000000000 XMM01=000000000000000000000000000000ff XMM02=000000000000000000000000000000ff XMM03=5320444f4854454d5f54505952434e45 XMM04=40404040404040404040404040404040 XMM05=5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a XMM06=20202020202020202020202020202020 XMM07=00000000000000000000000000000000 XMM08=ffbc64ffffbc44ffffbc34ffffbc9f00 XMM09=00000000000000000000000000000000 XMM10=00000000000000000000000000000000 XMM11=00000000000000000000000000000000 XMM12=00000000000000000000000000000000 XMM13=00000000000000000000000000000000 XMM14=00000000000000000000000000000000 XMM15=00000000000000000000000000000000 info registers vcpu 1 RAX=0000000000001000 RBX=0000000000000cc0 RCX=0000000000000005 RDX=1ffffffff0ba79d0 RSI=0000000000000cc0 RDI=ffff8880087b63c0 RBP=ffff88801476f898 RSP=ffff88801476f850 R8 =0000000000000001 R9 =0000000000000000 R10=000000000000002f R11=63206e6f69737365 R12=ffff8880087b63c0 R13=ffffffff85d3ce80 R14=ffff88801476f928 R15=ffff88801476fd36 RIP=ffffffff81807d89 RFL=00000206 [-----P-] CPL=0 II=0 A20=1 SMM=0 HLT=0 ES =0000 0000000000000000 00000000 00000000 CS =0010 0000000000000000 ffffffff 00a09b00 DPL=0 CS64 [-RA] SS =0018 0000000000000000 ffffffff 00c09300 DPL=0 DS [-WA] DS =0000 0000000000000000 00000000 00000000 FS =0000 00007f79538bf900 00000000 00000000 GS =0000 ffff88806cf00000 00000000 00000000 LDT=0000 fffffe0000000000 00000000 00000000 TR =0040 fffffe000004a000 00004087 00008b00 DPL=0 TSS64-busy GDT= fffffe0000048000 0000007f IDT= fffffe0000000000 00000fff CR0=80050033 CR2=00007f7952cade40 CR3=0000000009ab8000 CR4=00350ee0 DR0=0000000000000000 DR1=0000000000000000 DR2=0000000000000000 DR3=0000000000000000 DR6=00000000ffff0ff0 DR7=0000000000000400 EFER=0000000000000d01 FCW=037f FSW=0000 [ST=0] FTW=00 MXCSR=00001f80 FPR0=0000000000000000 0000 FPR1=0000000000000000 0000 FPR2=0000000000000000 0000 FPR3=0000000000000000 0000 FPR4=0000000000000000 0000 FPR5=0000000000000000 0000 FPR6=0000000000000000 0000 FPR7=0000000000000000 0000 XMM00=756f6a2f646d65747379732f6e75722f XMM01=00676f6c7379732f6c616e72756f6a2f XMM02=756f6a2f646d65747379732f6e75722f XMM03=006c616e72756f6a2f646d6574737973 XMM04=04c454ea0b3d9ec400000000000ae988 XMM05=72e3daeb2c86963c00000000001356b8 XMM06=ae96d7545ca40a5100000000001340e8 XMM07=fb795ef6d65770560000000000124970 XMM08=4f5453444600273d67736d000d0a0920 XMM09=00000000000000000000000000000000 XMM10=20200000000020202020202020200000 XMM11=00000000000000000000000000000000 XMM12=00000000000000000000000000000000 XMM13=00000000000000000000000000000000 XMM14=00000000000000000000000000000000 XMM15=00000000000000000000000000000000