Debian GNU/Linux 11 syzkaller ttyS0 syzkaller login: [ 32.722128] BUG: Bad rss-counter state mm:00000000baa7f939 type:MM_FILEPAGES val:33 [ 32.723320] BUG: Bad rss-counter state mm:00000000baa7f939 type:MM_ANONPAGES val:22 [ 32.873040] ================================================================== [ 32.873948] BUG: KASAN: slab-use-after-free in vma_interval_tree_remove+0xc75/0xec0 [ 32.874904] Read of size 8 at addr ffff88800fe92140 by task sshd/221 [ 32.875672] [ 32.875896] CPU: 0 PID: 221 Comm: sshd Not tainted 6.4.0-rc7-next-20230619 #1 [ 32.876859] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014 [ 32.877837] Call Trace: [ 32.878161] [ 32.878461] dump_stack_lvl+0x91/0xf0 [ 32.878963] print_report+0xcc/0x620 [ 32.879444] ? __virt_addr_valid+0x102/0x340 [ 32.879994] ? vma_interval_tree_remove+0xc75/0xec0 [ 32.880614] ? vma_interval_tree_remove+0xc75/0xec0 [ 32.881235] kasan_report+0xbe/0xf0 [ 32.881718] ? vma_interval_tree_remove+0xc75/0xec0 [ 32.882342] vma_interval_tree_remove+0xc75/0xec0 [ 32.882968] vma_prepare+0xc54/0x11a0 [ 32.883454] __split_vma+0x5af/0x950 [ 32.883925] ? __pfx___split_vma+0x10/0x10 [ 32.884447] ? find_held_lock+0x2c/0x110 [ 32.884965] do_vmi_align_munmap+0x2ba/0x11f0 [ 32.885525] ? lock_is_held_type+0x9f/0x120 [ 32.886065] ? __pfx_do_vmi_align_munmap+0x10/0x10 [ 32.886675] ? mtree_range_walk+0x632/0x900 [ 32.887222] ? mas_walk+0x5c7/0x7c0 [ 32.887691] do_vmi_munmap+0x1f1/0x2b0 [ 32.888180] mmap_region+0x1f9/0x2660 [ 32.888658] ? vm_mmap_pgoff+0x15c/0x3a0 [ 32.889166] ? __pfx_arch_get_unmapped_area_topdown+0x10/0x10 [ 32.889885] ? __pfx_lock_acquire+0x10/0x10 [ 32.890413] ? __pfx_mmap_region+0x10/0x10 [ 32.890955] ? security_mmap_addr+0x7d/0xa0 [ 32.891490] ? get_unmapped_area+0x1f5/0x3f0 [ 32.892032] do_mmap+0x854/0xf00 [ 32.892469] vm_mmap_pgoff+0x1a6/0x3a0 [ 32.892973] ? __pfx_vm_mmap_pgoff+0x10/0x10 [ 32.893538] ksys_mmap_pgoff+0x3af/0x500 [ 32.894038] do_syscall_64+0x3f/0x90 [ 32.894518] entry_SYSCALL_64_after_hwframe+0x6e/0xd8 [ 32.895165] RIP: 0033:0x7f84944fbd82 [ 32.895622] 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 [ 32.897744] RSP: 002b:00007ffee0f554e8 EFLAGS: 00000206 ORIG_RAX: 0000000000000009 [ 32.898665] RAX: ffffffffffffffda RBX: 0000000000000812 RCX: 00007f84944fbd82 [ 32.899503] RDX: 0000000000000005 RSI: 0000000000001000 RDI: 00007f8493935000 [ 32.900352] RBP: 00007f8493935000 R08: 0000000000000009 R09: 0000000000001000 [ 32.901198] R10: 0000000000000812 R11: 0000000000000206 R12: 0000560ba32faec0 [ 32.902042] R13: 00007ffee0f55500 R14: 00007ffee0f55530 R15: 00007ffee0f55890 [ 32.902901] [ 32.903194] [ 32.903411] Allocated by task 214: [ 32.903835] kasan_save_stack+0x22/0x50 [ 32.904342] kasan_set_track+0x25/0x30 [ 32.904838] __kasan_slab_alloc+0x59/0x70 [ 32.905366] kmem_cache_alloc+0x16b/0x370 [ 32.905878] vm_area_dup+0x20/0x160 [ 32.906329] __split_vma+0x170/0x950 [ 32.906808] split_vma+0xc6/0x110 [ 32.907249] mprotect_fixup+0x8d2/0xb30 [ 32.907761] do_mprotect_pkey+0x87e/0xd40 [ 32.908278] __x64_sys_mprotect+0x78/0xc0 [ 32.908799] do_syscall_64+0x3f/0x90 [ 32.909266] entry_SYSCALL_64_after_hwframe+0x6e/0xd8 [ 32.909906] [ 32.910120] Freed by task 211: [ 32.910517] kasan_save_stack+0x22/0x50 [ 32.911020] kasan_set_track+0x25/0x30 [ 32.911520] kasan_save_free_info+0x2b/0x50 [ 32.912052] __kasan_slab_free+0x10a/0x190 [ 32.912593] kmem_cache_free+0x10d/0x4d0 [ 32.913094] rcu_core+0x8c8/0x2860 [ 32.913534] __do_softirq+0x1b7/0x7d4 [ 32.914010] [ 32.914223] Last potentially related work creation: [ 32.914816] kasan_save_stack+0x22/0x50 [ 32.915314] __kasan_record_aux_stack+0x8e/0xa0 [ 32.915885] __call_rcu_common.constprop.0+0x6a/0xb90 [ 32.916524] remove_vma+0x139/0x170 [ 32.916972] do_vmi_align_munmap+0xd4a/0x11f0 [ 32.917523] do_vmi_munmap+0x1f1/0x2b0 [ 32.918004] __vm_munmap+0x138/0x3a0 [ 32.918481] __x64_sys_munmap+0x59/0x80 [ 32.918976] do_syscall_64+0x3f/0x90 [ 32.919446] entry_SYSCALL_64_after_hwframe+0x6e/0xd8 [ 32.920091] [ 32.920309] The buggy address belongs to the object at ffff88800fe920e8 [ 32.920309] which belongs to the cache vm_area_struct of size 168 [ 32.921775] The buggy address is located 88 bytes inside of [ 32.921775] freed 168-byte region [ffff88800fe920e8, ffff88800fe92190) [ 32.923180] [ 32.923394] The buggy address belongs to the physical page: [ 32.924048] page:000000009e795f56 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0xfe92 [ 32.925129] memcg:ffff888015e38d01 [ 32.925559] flags: 0x100000000000200(slab|node=0|zone=1) [ 32.926201] page_type: 0xffffffff() [ 32.926658] raw: 0100000000000200 ffff88800879fc80 ffffea00003c86c0 dead000000000002 [ 32.927571] raw: 0000000000000000 0000000000110011 00000001ffffffff ffff888015e38d01 [ 32.928471] page dumped because: kasan: bad access detected [ 32.929131] [ 32.929344] Memory state around the buggy address: [ 32.929926] ffff88800fe92000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 32.930789] ffff88800fe92080: fb fb fb fb fb fc fc fc fc fc fc fc fc fa fb fb [ 32.931648] >ffff88800fe92100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 32.932493] ^ [ 32.933130] ffff88800fe92180: fb fb fc fc fc fc fc fc fc fc 00 00 00 00 00 00 [ 32.933983] ffff88800fe92200: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 fc [ 32.934848] ================================================================== [ 32.936133] Disabling lock debugging due to kernel taint [ 34.761433] BUG: Bad rss-counter state mm:0000000027fa7dc1 type:MM_FILEPAGES val:33 [ 34.762332] BUG: Bad rss-counter state mm:0000000027fa7dc1 type:MM_ANONPAGES val:22 [ 35.219889] BUG: Bad rss-counter state mm:0000000013369da1 type:MM_FILEPAGES val:33 [ 35.220878] BUG: Bad rss-counter state mm:0000000013369da1 type:MM_ANONPAGES val:22 Warning: Permanently added '[localhost]:29609' (ECDSA) to the list of known hosts. 2023/06/19 15:18:23 fuzzer started 2023/06/19 15:18:23 dialing manager at localhost:44161 2023/06/19 15:18:23 checking machine... 2023/06/19 15:18:23 checking revisions... [ 36.043965] kmemleak: Automatic memory scanning thread ended 2023/06/19 15:18:23 testing simple program... [ 36.095520] cgroup: Unknown subsys name 'net' [ 36.136333] cgroup: Unknown subsys name 'rlimit' executing program executing program executing program VM DIAGNOSIS: 15:18:21 Registers: info registers vcpu 0 RAX=ffffffff813782a8 RBX=ffffffff813ad420 RCX=0000000000000001 RDX=1ffff1100d9c135e RSI=ffffffff813782a8 RDI=ffff88806ce09b60 RBP=ffff88806ce09b30 RSP=ffff88806ce09a90 R8 =0000000000000001 R9 =ffff88806ce09ad8 R10=0000000000038001 R11=0000000000020cb4 R12=ffff88806ce09b60 R13=0000000000000000 R14=ffff888015f63680 R15=ffff8880139d57a0 RIP=ffffffff813ad424 RFL=00000282 [--S----] 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 00007f5f00faf700 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=000055cef4a29c78 CR3=0000000018cde000 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=2033323a38313a3531203931206e754a XMM01=657463656e6e6f63736944203a5d3033 XMM02=302e303120746f6f722072657375206d XMM03=203a5d3033325b646873732072656c6c XMM04=69662068637573206f4e203a656c6163 XMM05=3a656c696620766e65206e65706f206f XMM06=65733a6468737328766e655f6d617020 XMM07=6b7a79732032323a38313a3531203931 XMM08=3d656e696c646d632022656369767265 XMM09=00000000000000000000000000000000 XMM10=00000000000000000000000000000000 XMM11=00000000000000000000000000000000 XMM12=00000000000000000000000000000000 XMM13=00000000000000000000000000000000 XMM14=00000000000000000000000000000000 XMM15=00000000000000000000000000000000 info registers vcpu 1 RAX=00000000000b6996 RBX=0000000000000001 RCX=ffffffff846000a9 RDX=0000000000000002 RSI=ffffffff864b9d50 RDI=ffffffff86053a2c RBP=ffff888014767408 RSP=ffff888014767330 R8 =ffffffff864b9d50 R9 =ffff8880147673f0 R10=0000000000038001 R11=00000000000b6996 R12=ffff888014767410 R13=ffff8880147673f8 R14=ffff8880147673f1 R15=ffff8880147673b0 RIP=ffffffff8112fc12 RFL=00000202 [-------] 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 00007f4022816900 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=00007fea57b38650 CR3=00000000095bc000 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=ffffffffffffffffffffffffffffffff XMM01=30306234386136303638616663356134 XMM02=38303062343861363036386166633561 XMM03=2f6c616e72756f6a2f676f6c2f6e7572 XMM04=e87d77b45f99eae700000000000ae988 XMM05=17f72fda542915670000000000135848 XMM06=e4cb8bb95a7664b600000000001346e0 XMM07=00000000000000000000000000000000 XMM08=415453454d49545f454d49544c414552 XMM09=00000000000000000000000000000000 XMM10=20200000000020202020202020200000 XMM11=00000000000000000000000000000000 XMM12=00000000000000000000000000000000 XMM13=00000000000000000000000000000000 XMM14=00000000000000000000000000000000 XMM15=00000000000000000000000000000000