syzkaller login: [ 31.020795] BUG: Bad rss-counter state mm:000000008e12400c type:MM_FILEPAGES val:33 [ 31.021808] BUG: Bad rss-counter state mm:000000008e12400c type:MM_ANONPAGES val:22 [ 31.183034] ================================================================== [ 31.183936] BUG: KASAN: slab-use-after-free in vma_interval_tree_remove+0xc75/0xec0 [ 31.184876] Read of size 8 at addr ffff8880160c6968 by task sshd/221 [ 31.185765] [ 31.185985] CPU: 1 PID: 221 Comm: sshd Not tainted 6.4.0-rc7-next-20230619 #1 [ 31.186879] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014 [ 31.187861] Call Trace: [ 31.188179] [ 31.188478] dump_stack_lvl+0x91/0xf0 [ 31.188966] print_report+0xcc/0x620 [ 31.189478] ? __virt_addr_valid+0x102/0x340 [ 31.190041] ? vma_interval_tree_remove+0xc75/0xec0 [ 31.190664] ? vma_interval_tree_remove+0xc75/0xec0 [ 31.191282] kasan_report+0xbe/0xf0 [ 31.191762] ? vma_interval_tree_remove+0xc75/0xec0 [ 31.192383] vma_interval_tree_remove+0xc75/0xec0 [ 31.192985] vma_prepare+0xc54/0x11a0 [ 31.193477] __split_vma+0x5af/0x950 [ 31.193955] ? __pfx___split_vma+0x10/0x10 [ 31.194487] ? find_held_lock+0x2c/0x110 [ 31.195008] do_vmi_align_munmap+0x2ba/0x11f0 [ 31.195576] ? lock_is_held_type+0x9f/0x120 [ 31.196116] ? __pfx_do_vmi_align_munmap+0x10/0x10 [ 31.196723] ? mtree_range_walk+0x632/0x900 [ 31.197275] ? mas_walk+0x5c7/0x7c0 [ 31.197758] do_vmi_munmap+0x1f1/0x2b0 [ 31.198255] mmap_region+0x1f9/0x2660 [ 31.198738] ? vm_mmap_pgoff+0x15c/0x3a0 [ 31.199251] ? __pfx_arch_get_unmapped_area_topdown+0x10/0x10 [ 31.199972] ? __pfx_lock_acquire+0x10/0x10 [ 31.200513] ? __pfx_mmap_region+0x10/0x10 [ 31.201043] ? security_mmap_addr+0x7d/0xa0 [ 31.201591] ? get_unmapped_area+0x1f5/0x3f0 [ 31.202145] do_mmap+0x854/0xf00 [ 31.202580] vm_mmap_pgoff+0x1a6/0x3a0 [ 31.203078] ? __pfx_vm_mmap_pgoff+0x10/0x10 [ 31.203637] ksys_mmap_pgoff+0x3af/0x500 [ 31.204143] do_syscall_64+0x3f/0x90 [ 31.204621] entry_SYSCALL_64_after_hwframe+0x6e/0xd8 [ 31.205274] RIP: 0033:0x7f75ef81fd82 [ 31.205740] 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 [ 31.207871] RSP: 002b:00007fff506de328 EFLAGS: 00000206 ORIG_RAX: 0000000000000009 [ 31.208772] RAX: ffffffffffffffda RBX: 0000000000000812 RCX: 00007f75ef81fd82 [ 31.209631] RDX: 0000000000000005 RSI: 0000000000001000 RDI: 00007f75eec59000 [ 31.210487] RBP: 00007f75eec59000 R08: 0000000000000009 R09: 0000000000001000 [ 31.211341] R10: 0000000000000812 R11: 0000000000000206 R12: 0000563144307d90 [ 31.212190] R13: 00007fff506de340 R14: 00007fff506de370 R15: 00007fff506de6d0 [ 31.213051] [ 31.213342] [ 31.213576] Allocated by task 214: [ 31.214005] kasan_save_stack+0x22/0x50 [ 31.214511] kasan_set_track+0x25/0x30 [ 31.215008] __kasan_slab_alloc+0x59/0x70 [ 31.215540] kmem_cache_alloc+0x16b/0x370 [ 31.216066] vm_area_dup+0x20/0x160 [ 31.216522] __split_vma+0x170/0x950 [ 31.216994] split_vma+0xc6/0x110 [ 31.217456] mprotect_fixup+0x8d2/0xb30 [ 31.217961] do_mprotect_pkey+0x87e/0xd40 [ 31.218491] __x64_sys_mprotect+0x78/0xc0 [ 31.219013] do_syscall_64+0x3f/0x90 [ 31.219495] entry_SYSCALL_64_after_hwframe+0x6e/0xd8 [ 31.220157] [ 31.220376] Freed by task 19: [ 31.220767] kasan_save_stack+0x22/0x50 [ 31.221281] kasan_set_track+0x25/0x30 [ 31.221790] kasan_save_free_info+0x2b/0x50 [ 31.222320] __kasan_slab_free+0x10a/0x190 [ 31.222848] kmem_cache_free+0x10d/0x4d0 [ 31.223355] rcu_core+0x8c8/0x2860 [ 31.223799] __do_softirq+0x1b7/0x7d4 [ 31.224280] [ 31.224497] Last potentially related work creation: [ 31.225086] kasan_save_stack+0x22/0x50 [ 31.225613] __kasan_record_aux_stack+0x8e/0xa0 [ 31.226187] __call_rcu_common.constprop.0+0x6a/0xb90 [ 31.226835] remove_vma+0x139/0x170 [ 31.227350] do_vmi_align_munmap+0xd4a/0x11f0 [ 31.227911] do_vmi_munmap+0x1f1/0x2b0 [ 31.228400] __vm_munmap+0x138/0x3a0 [ 31.228872] __x64_sys_munmap+0x59/0x80 [ 31.229378] do_syscall_64+0x3f/0x90 [ 31.229859] entry_SYSCALL_64_after_hwframe+0x6e/0xd8 [ 31.230501] [ 31.230715] The buggy address belongs to the object at ffff8880160c6910 [ 31.230715] which belongs to the cache vm_area_struct of size 168 [ 31.232207] The buggy address is located 88 bytes inside of [ 31.232207] freed 168-byte region [ffff8880160c6910, ffff8880160c69b8) [ 31.233636] [ 31.233852] The buggy address belongs to the physical page: [ 31.234511] page:00000000b621302c refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x160c6 [ 31.235607] memcg:ffff888016823b01 [ 31.236037] flags: 0x100000000000200(slab|node=0|zone=1) [ 31.236684] page_type: 0xffffffff() [ 31.237140] raw: 0100000000000200 ffff88800879fc80 dead000000000122 0000000000000000 [ 31.238065] raw: 0000000000000000 0000000000110011 00000001ffffffff ffff888016823b01 [ 31.238975] page dumped because: kasan: bad access detected [ 31.239637] [ 31.239856] Memory state around the buggy address: [ 31.240443] ffff8880160c6800: fc fc fc fc fc 00 00 00 00 00 00 00 00 00 00 00 [ 31.241302] ffff8880160c6880: 00 00 00 00 00 00 00 00 00 00 fc fc fc fc fc fc [ 31.242184] >ffff8880160c6900: fc fc fa fb fb fb fb fb fb fb fb fb fb fb fb fb [ 31.243042] ^ [ 31.243832] ffff8880160c6980: fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc fa [ 31.244692] ffff8880160c6a00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 31.245555] ================================================================== [ 31.246475] Disabling lock debugging due to kernel taint [ 33.240400] BUG: Bad rss-counter state mm:00000000379e924d type:MM_FILEPAGES val:33 [ 33.241608] BUG: Bad rss-counter state mm:00000000379e924d type:MM_ANONPAGES val:22 [ 33.619823] BUG: Bad rss-counter state mm:0000000060955572 type:MM_FILEPAGES val:33 [ 33.620816] BUG: Bad rss-counter state mm:0000000060955572 type:MM_ANONPAGES val:22 Warning: Permanently added '[localhost]:5723' (ECDSA) to the list of known hosts. 2023/06/20 00:25:25 fuzzer started 2023/06/20 00:25:25 dialing manager at localhost:44161 2023/06/20 00:25:25 checking machine... 2023/06/20 00:25:25 checking revisions... [ 34.305248] kmemleak: Automatic memory scanning thread ended 2023/06/20 00:25:25 testing simple program... [ 34.358299] cgroup: Unknown subsys name 'net' [ 34.399554] cgroup: Unknown subsys name 'rlimit' executing program executing program executing program VM DIAGNOSIS: 00:25:24 Registers: info registers vcpu 0 RAX=ffffffff814c83d4 RBX=ffffffff856528e0 RCX=ffffffff814c8421 RDX=ffffffff8542a6c0 RSI=0000000000000100 RDI=0000000000000005 RBP=0000000000000000 RSP=ffff88806ce09a28 R8 =0000000000000005 R9 =0000000000000000 R10=0000000000000000 R11=00000000000b5420 R12=ffffffff8661f20f R13=0000000000000000 R14=ffffffff8542a6c0 R15=ffff88800d2e8b30 RIP=ffffffff814c8422 RFL=00000246 [---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 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=00007f25acf1e9c0 CR3=00000000168b6000 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=2035323a35323a3030203032206e754a XMM01=73732878696e755f6d6170203a5d3033 XMM02=65736f6c63206e6f6973736573203a29 XMM03=755f6d6170203a5d3033325b64687373 XMM04=69662068637573206f4e203a656c6163 XMM05=3a656c696620766e65206e65706f206f XMM06=65733a6468737328766e655f6d617020 XMM07=6b7a79732034323a35323a3030203032 XMM08=3d656e696c646d632022656369767265 XMM09=00000000000000000000000000000000 XMM10=00000000000000000000000000000000 XMM11=00000000000000000000000000000000 XMM12=00000000000000000000000000000000 XMM13=00000000000000000000000000000000 XMM14=00000000000000000000000000000000 XMM15=00000000000000000000000000000000 info registers vcpu 1 RAX=0000000000000000 RBX=ffffea00006d7dc0 RCX=0000000000000000 RDX=ffff888010331b40 RSI=ffffffff8170ba8a RDI=ffff88800c5667d0 RBP=ffff88800c566780 RSP=ffff88801998f798 R8 =0000000000000007 R9 =0000000000000000 R10=0000000000000000 R11=0000000000000000 R12=ffff8880094a01d0 R13=00007f99a0548000 R14=ffff88801bc3ca38 R15=dffffc0000000000 RIP=ffffffff8170ba9a RFL=00000216 [----AP-] 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 00007f99a058d900 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=00007f99a054d008 CR3=00000000103a0000 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=00000000000000000000000000000000 XMM01=652022746f6f72223d74636361207469 XMM02=3d6c616e696d72657420322e322e302e XMM03=3d656d616e74736f682022646873732f XMM04=40404040404040404040404040404040 XMM05=5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a XMM06=20202020202020202020202020202020 XMM07=00000000000000000000000000000000 XMM08=652075253d64692073253d706f000000 XMM09=00000000000000000000000000000000 XMM10=00000000000000000000000000000000 XMM11=00000000000000000000000000000000 XMM12=00000000000000000000000000000000 XMM13=00000000000000000000000000000000 XMM14=00000000000000000000000000000000 XMM15=00000000000000000000000000000000