Debian GNU/Linux 11 syzkaller ttyS0 syzkaller login: [ 30.209497] BUG: Bad rss-counter state mm:0000000092837d3c type:MM_FILEPAGES val:33 [ 30.210767] BUG: Bad rss-counter state mm:0000000092837d3c type:MM_ANONPAGES val:22 [ 30.216721] ================================================================== [ 30.217761] BUG: KASAN: slab-use-after-free in vma_interval_tree_remove+0xc75/0xec0 [ 30.218895] Read of size 8 at addr ffff88800e436228 by task sshd/219 [ 30.219651] [ 30.219867] CPU: 0 PID: 219 Comm: sshd Not tainted 6.4.0-rc7-next-20230620 #1 [ 30.220763] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014 [ 30.221757] Call Trace: [ 30.222091] [ 30.222377] dump_stack_lvl+0x91/0xf0 [ 30.222879] print_report+0xcc/0x620 [ 30.223366] ? __virt_addr_valid+0x102/0x340 [ 30.223924] ? vma_interval_tree_remove+0xc75/0xec0 [ 30.224559] ? vma_interval_tree_remove+0xc75/0xec0 [ 30.225182] kasan_report+0xbe/0xf0 [ 30.225671] ? vma_interval_tree_remove+0xc75/0xec0 [ 30.226304] vma_interval_tree_remove+0xc75/0xec0 [ 30.226912] vma_prepare+0xc54/0x11a0 [ 30.227390] __split_vma+0x5af/0x950 [ 30.227867] ? __pfx___split_vma+0x10/0x10 [ 30.228401] ? find_held_lock+0x2c/0x110 [ 30.228932] do_vmi_align_munmap+0x2ba/0x11f0 [ 30.229498] ? lock_is_held_type+0x9f/0x120 [ 30.230055] ? __pfx_do_vmi_align_munmap+0x10/0x10 [ 30.230666] ? mtree_range_walk+0x632/0x900 [ 30.231215] ? mas_walk+0x5c7/0x7c0 [ 30.231694] do_vmi_munmap+0x1f1/0x2b0 [ 30.232184] mmap_region+0x1f9/0x2660 [ 30.232671] ? vm_mmap_pgoff+0x15c/0x3a0 [ 30.233182] ? __pfx_arch_get_unmapped_area_topdown+0x10/0x10 [ 30.233892] ? __pfx_lock_acquire+0x10/0x10 [ 30.234429] ? __pfx_mmap_region+0x10/0x10 [ 30.234961] ? security_mmap_addr+0x7d/0xa0 [ 30.235491] ? get_unmapped_area+0x1f5/0x3f0 [ 30.236041] do_mmap+0x854/0xf00 [ 30.236479] vm_mmap_pgoff+0x1a6/0x3a0 [ 30.236974] ? __pfx_vm_mmap_pgoff+0x10/0x10 [ 30.237538] ksys_mmap_pgoff+0x3af/0x500 [ 30.238059] do_syscall_64+0x3f/0x90 [ 30.238541] entry_SYSCALL_64_after_hwframe+0x6e/0xd8 [ 30.239186] RIP: 0033:0x7f5ac7f64d82 [ 30.239637] 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 [ 30.241761] RSP: 002b:00007ffd6fa03de8 EFLAGS: 00000206 ORIG_RAX: 0000000000000009 [ 30.242671] RAX: ffffffffffffffda RBX: 0000000000000812 RCX: 00007f5ac7f64d82 [ 30.243521] RDX: 0000000000000005 RSI: 0000000000001000 RDI: 00007f5ac739e000 [ 30.244366] RBP: 00007f5ac739e000 R08: 0000000000000009 R09: 0000000000001000 [ 30.245213] R10: 0000000000000812 R11: 0000000000000206 R12: 0000555efc202d90 [ 30.246082] R13: 00007ffd6fa03e00 R14: 00007ffd6fa03e30 R15: 00007ffd6fa04190 [ 30.246940] [ 30.247230] [ 30.247446] Allocated by task 212: [ 30.247874] kasan_save_stack+0x22/0x50 [ 30.248381] kasan_set_track+0x25/0x30 [ 30.248877] __kasan_slab_alloc+0x59/0x70 [ 30.249409] kmem_cache_alloc+0x16b/0x370 [ 30.249925] vm_area_dup+0x20/0x160 [ 30.250389] __split_vma+0x170/0x950 [ 30.250855] split_vma+0xc6/0x110 [ 30.251297] mprotect_fixup+0x8d2/0xb30 [ 30.251796] do_mprotect_pkey+0x87e/0xd40 [ 30.252320] __x64_sys_mprotect+0x78/0xc0 [ 30.252837] do_syscall_64+0x3f/0x90 [ 30.253320] entry_SYSCALL_64_after_hwframe+0x6e/0xd8 [ 30.253979] [ 30.254196] Freed by task 212: [ 30.254589] kasan_save_stack+0x22/0x50 [ 30.255093] kasan_set_track+0x25/0x30 [ 30.255585] kasan_save_free_info+0x2b/0x50 [ 30.256117] __kasan_slab_free+0x10a/0x190 [ 30.256656] kmem_cache_free+0x10d/0x4d0 [ 30.257164] rcu_core+0x8c8/0x2860 [ 30.257604] __do_softirq+0x1b7/0x7d4 [ 30.258091] [ 30.258304] Last potentially related work creation: [ 30.258885] kasan_save_stack+0x22/0x50 [ 30.259394] __kasan_record_aux_stack+0x8e/0xa0 [ 30.259968] __call_rcu_common.constprop.0+0x6a/0xb90 [ 30.260612] remove_vma+0x139/0x170 [ 30.261063] do_vmi_align_munmap+0xd4a/0x11f0 [ 30.261624] do_vmi_munmap+0x1f1/0x2b0 [ 30.262118] __vm_munmap+0x138/0x3a0 [ 30.262598] __x64_sys_munmap+0x59/0x80 [ 30.263096] do_syscall_64+0x3f/0x90 [ 30.263584] entry_SYSCALL_64_after_hwframe+0x6e/0xd8 [ 30.264228] [ 30.264442] The buggy address belongs to the object at ffff88800e4361d0 [ 30.264442] which belongs to the cache vm_area_struct of size 168 [ 30.265916] The buggy address is located 88 bytes inside of [ 30.265916] freed 168-byte region [ffff88800e4361d0, ffff88800e436278) [ 30.267369] [ 30.267587] The buggy address belongs to the physical page: [ 30.268246] page:00000000e110e415 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0xe436 [ 30.269327] memcg:ffff88800e063001 [ 30.269755] flags: 0x100000000000200(slab|node=0|zone=1) [ 30.270410] page_type: 0xffffffff() [ 30.270861] raw: 0100000000000200 ffff8880087a0c80 ffffea0000311d00 dead000000000008 [ 30.271778] raw: 0000000000000000 0000000000110011 00000001ffffffff ffff88800e063001 [ 30.272688] page dumped because: kasan: bad access detected [ 30.273355] [ 30.273571] Memory state around the buggy address: [ 30.274161] ffff88800e436100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 30.275011] ffff88800e436180: fb fb fc fc fc fc fc fc fc fc fa fb fb fb fb fb [ 30.275868] >ffff88800e436200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fc [ 30.276731] ^ [ 30.277280] ffff88800e436280: fc fc fc fc fc fc fc 00 00 00 00 00 00 00 00 00 [ 30.278149] ffff88800e436300: 00 00 00 00 00 00 00 00 00 00 00 00 fc fc fc fc [ 30.278992] ================================================================== [ 30.280124] Disabling lock debugging due to kernel taint [ 32.760901] BUG: Bad rss-counter state mm:00000000454224d9 type:MM_FILEPAGES val:33 [ 32.762100] BUG: Bad rss-counter state mm:00000000454224d9 type:MM_ANONPAGES val:22 [ 33.173143] BUG: Bad rss-counter state mm:000000006b717183 type:MM_FILEPAGES val:33 [ 33.174234] BUG: Bad rss-counter state mm:000000006b717183 type:MM_ANONPAGES val:22 Warning: Permanently added '[localhost]:17589' (ECDSA) to the list of known hosts. 2023/06/20 21:51:15 fuzzer started 2023/06/20 21:51:15 dialing manager at localhost:36067 2023/06/20 21:51:15 checking machine... 2023/06/20 21:51:15 checking revisions... [ 33.905267] kmemleak: Automatic memory scanning thread ended 2023/06/20 21:51:15 testing simple program... [ 33.954035] cgroup: Unknown subsys name 'net' [ 33.998045] cgroup: Unknown subsys name 'rlimit' executing program executing program executing program VM DIAGNOSIS: 21:51:14 Registers: info registers vcpu 0 RAX=0000000000010050 RBX=ffff888009fb0000 RCX=0000000000000000 RDX=00000000000101f7 RSI=ffffffff8219168b RDI=0000000000000007 RBP=ffff888009fb0000 RSP=ffff88806ce09da8 R8 =0000000000000007 R9 =0000000000010000 R10=00000000000101f7 R11=ffff88806ce09ff8 R12=00000000000101f7 R13=ffff888009fb0180 R14=ffff888009fb44c8 R15=ffff888009fb0008 RIP=ffffffff8219168f RFL=00000046 [---Z-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 00007fcbf75af900 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=00007fcbf7b64650 CR3=000000000ec6a000 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=0000000000000050 RBX=ffff888009fb0000 RCX=0000000000000000 RDX=00000000000101f7 RSI=ffffffff8219168b RDI=0000000000000007 RBP=00000000000003e7 RSP=ffff88800a18f7d8 R8 =0000000000000007 R9 =0000000000010000 R10=00000000000101f7 R11=0000000000000128 R12=00000000000101f7 R13=ffffed10013f6001 R14=ffffffff85a23960 R15=dffffc0000000000 RIP=ffffffff8219168f 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 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=00007f3b8c7069f8 CR3=00000000090a4000 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=31353a3132203032206e754a3e38333c XMM01=6d6f72662064657463656e6e6f637369 XMM02=2e303120746f6f722072657375206d6f XMM03=3a5d3832325b646873732034313a3135 XMM04=6456774875434142334f726f59427469 XMM05=485320415352203a3268737320303436 XMM06=206d6f726620746f6f7220726f662079 XMM07=00000000000000000000000000000000 XMM08=3a677562656420676f6c737973720000 XMM09=00000000000000000000000000000000 XMM10=00000000000000000000000000000000 XMM11=00000000000000000000000000000000 XMM12=00000000000000000000000000000000 XMM13=00000000000000000000000000000000 XMM14=00000000000000000000000000000000 XMM15=00000000000000000000000000000000