Debian GNU/Linux 11 syzkaller ttyS0 syzkaller login: [ 35.762586] BUG: Bad rss-counter state mm:00000000113f7b6b type:MM_FILEPAGES val:33 [ 35.763614] BUG: Bad rss-counter state mm:00000000113f7b6b type:MM_ANONPAGES val:22 [ 35.928621] ================================================================== [ 35.929698] BUG: KASAN: slab-use-after-free in vma_interval_tree_remove+0xc75/0xec0 [ 35.930795] Read of size 8 at addr ffff888019762968 by task sshd/219 [ 35.931883] [ 35.932102] CPU: 1 PID: 219 Comm: sshd Not tainted 6.4.0-rc7-next-20230619 #1 [ 35.932971] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014 [ 35.933963] Call Trace: [ 35.934284] [ 35.934569] dump_stack_lvl+0x91/0xf0 [ 35.935069] print_report+0xcc/0x620 [ 35.935560] ? __virt_addr_valid+0x102/0x340 [ 35.936112] ? vma_interval_tree_remove+0xc75/0xec0 [ 35.936724] ? vma_interval_tree_remove+0xc75/0xec0 [ 35.937340] kasan_report+0xbe/0xf0 [ 35.937827] ? vma_interval_tree_remove+0xc75/0xec0 [ 35.938444] vma_interval_tree_remove+0xc75/0xec0 [ 35.939063] vma_prepare+0xc54/0x11a0 [ 35.939546] __split_vma+0x5af/0x950 [ 35.940019] ? __pfx___split_vma+0x10/0x10 [ 35.940547] ? find_held_lock+0x2c/0x110 [ 35.941066] do_vmi_align_munmap+0x2ba/0x11f0 [ 35.941628] ? lock_is_held_type+0x9f/0x120 [ 35.942167] ? __pfx_do_vmi_align_munmap+0x10/0x10 [ 35.942773] ? mtree_range_walk+0x632/0x900 [ 35.943346] ? mas_walk+0x5c7/0x7c0 [ 35.943816] do_vmi_munmap+0x1f1/0x2b0 [ 35.944305] mmap_region+0x1f9/0x2660 [ 35.944784] ? vm_mmap_pgoff+0x15c/0x3a0 [ 35.945292] ? __pfx_arch_get_unmapped_area_topdown+0x10/0x10 [ 35.946036] ? __pfx_lock_acquire+0x10/0x10 [ 35.946583] ? __pfx_mmap_region+0x10/0x10 [ 35.947148] ? security_mmap_addr+0x7d/0xa0 [ 35.947685] ? get_unmapped_area+0x1f5/0x3f0 [ 35.948240] do_mmap+0x854/0xf00 [ 35.948680] vm_mmap_pgoff+0x1a6/0x3a0 [ 35.949180] ? __pfx_vm_mmap_pgoff+0x10/0x10 [ 35.949743] ksys_mmap_pgoff+0x3af/0x500 [ 35.950244] do_syscall_64+0x3f/0x90 [ 35.950719] entry_SYSCALL_64_after_hwframe+0x6e/0xd8 [ 35.951361] RIP: 0033:0x7fc58f843d82 [ 35.951810] 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 [ 35.953909] RSP: 002b:00007ffe84fb7c08 EFLAGS: 00000206 ORIG_RAX: 0000000000000009 [ 35.954814] RAX: ffffffffffffffda RBX: 0000000000000812 RCX: 00007fc58f843d82 [ 35.955673] RDX: 0000000000000005 RSI: 0000000000001000 RDI: 00007fc58ec7d000 [ 35.956534] RBP: 00007fc58ec7d000 R08: 0000000000000009 R09: 0000000000001000 [ 35.957369] R10: 0000000000000812 R11: 0000000000000206 R12: 0000558435e54ec0 [ 35.958208] R13: 00007ffe84fb7c20 R14: 00007ffe84fb7c50 R15: 00007ffe84fb7fb0 [ 35.959063] [ 35.959352] [ 35.959565] Allocated by task 212: [ 35.959991] kasan_save_stack+0x22/0x50 [ 35.960491] kasan_set_track+0x25/0x30 [ 35.960982] __kasan_slab_alloc+0x59/0x70 [ 35.961503] kmem_cache_alloc+0x16b/0x370 [ 35.962016] vm_area_dup+0x20/0x160 [ 35.962464] __split_vma+0x170/0x950 [ 35.962942] split_vma+0xc6/0x110 [ 35.963378] mprotect_fixup+0x8d2/0xb30 [ 35.963874] do_mprotect_pkey+0x87e/0xd40 [ 35.964387] __x64_sys_mprotect+0x78/0xc0 [ 35.964899] do_syscall_64+0x3f/0x90 [ 35.965364] entry_SYSCALL_64_after_hwframe+0x6e/0xd8 [ 35.965995] [ 35.966211] Freed by task 212: [ 35.966602] kasan_save_stack+0x22/0x50 [ 35.967122] kasan_set_track+0x25/0x30 [ 35.967611] kasan_save_free_info+0x2b/0x50 [ 35.968150] __kasan_slab_free+0x10a/0x190 [ 35.968677] kmem_cache_free+0x10d/0x4d0 [ 35.969176] rcu_core+0x8c8/0x2860 [ 35.969613] __do_softirq+0x1b7/0x7d4 [ 35.970090] [ 35.970307] Last potentially related work creation: [ 35.970886] kasan_save_stack+0x22/0x50 [ 35.971400] __kasan_record_aux_stack+0x8e/0xa0 [ 35.971968] __call_rcu_common.constprop.0+0x6a/0xb90 [ 35.972600] remove_vma+0x139/0x170 [ 35.973178] do_vmi_align_munmap+0xd4a/0x11f0 [ 35.973730] do_vmi_munmap+0x1f1/0x2b0 [ 35.974216] __vm_munmap+0x138/0x3a0 [ 35.974684] __x64_sys_munmap+0x59/0x80 [ 35.975201] do_syscall_64+0x3f/0x90 [ 35.975669] entry_SYSCALL_64_after_hwframe+0x6e/0xd8 [ 35.976313] [ 35.976530] The buggy address belongs to the object at ffff888019762910 [ 35.976530] which belongs to the cache vm_area_struct of size 168 [ 35.977984] The buggy address is located 88 bytes inside of [ 35.977984] freed 168-byte region [ffff888019762910, ffff8880197629b8) [ 35.979381] [ 35.979601] The buggy address belongs to the physical page: [ 35.980252] page:00000000bc94d41f refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x19762 [ 35.981330] memcg:ffff8880163b4501 [ 35.981748] flags: 0x100000000000200(slab|node=0|zone=1) [ 35.982381] page_type: 0xffffffff() [ 35.982823] raw: 0100000000000200 ffff88800879fc80 dead000000000122 0000000000000000 [ 35.983759] raw: 0000000000000000 0000000000110011 00000001ffffffff ffff8880163b4501 [ 35.984658] page dumped because: kasan: bad access detected [ 35.985319] [ 35.985531] Memory state around the buggy address: [ 35.986104] ffff888019762800: fc fc fc fc fc 00 00 00 00 00 00 00 00 00 00 00 [ 35.986960] ffff888019762880: 00 00 00 00 00 00 00 00 00 00 fc fc fc fc fc fc [ 35.987807] >ffff888019762900: fc fc fa fb fb fb fb fb fb fb fb fb fb fb fb fb [ 35.988643] ^ [ 35.989412] ffff888019762980: fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc fa [ 35.990257] ffff888019762a00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 35.991100] ================================================================== [ 35.992024] Disabling lock debugging due to kernel taint [ 37.990482] BUG: Bad rss-counter state mm:00000000be32a5da type:MM_FILEPAGES val:33 [ 37.991477] BUG: Bad rss-counter state mm:00000000be32a5da type:MM_ANONPAGES val:22 [ 38.413927] BUG: Bad rss-counter state mm:000000005bd26622 type:MM_FILEPAGES val:33 [ 38.414950] BUG: Bad rss-counter state mm:000000005bd26622 type:MM_ANONPAGES val:22 Warning: Permanently added '[localhost]:33134' (ECDSA) to the list of known hosts. 2023/06/19 23:18:46 fuzzer started 2023/06/19 23:18:46 dialing manager at localhost:44161 2023/06/19 23:18:46 checking machine... 2023/06/19 23:18:46 checking revisions... [ 39.158921] kmemleak: Automatic memory scanning thread ended 2023/06/19 23:18:46 testing simple program... [ 39.208581] cgroup: Unknown subsys name 'net' [ 39.280986] cgroup: Unknown subsys name 'rlimit' executing program executing program executing program VM DIAGNOSIS: 23:18:40 Registers: info registers vcpu 0 RAX=ffff8880163fc720 RBX=ffff8880163fc980 RCX=00000000800d000b RDX=00000000800d000c RSI=ffff8880163fc980 RDI=ffff88800844f780 RBP=ffff888016ba7908 RSP=ffff888016ba7870 R8 =00000000800d000b R9 =0000000000000000 R10=ffffea000058ff00 R11=00000000000d000c R12=ffffea000058ff00 R13=ffff8880163fc720 R14=00000000800d000b R15=ffff88800844f780 RIP=ffffffff818095bf RFL=00000242 [---Z---] 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 00007ff6fe3f3700 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=00007f25e256e0b0 CR3=000000000d904000 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=2035343a38313a3332203931206e754a XMM01=73732878696e755f6d6170203a5d3832 XMM02=65736f6c63206e6f6973736573203a29 XMM03=755f6d6170203a5d3832325b64687373 XMM04=69662068637573206f4e203a656c6163 XMM05=3a656c696620766e65206e65706f206f XMM06=65733a6468737328766e655f6d617020 XMM07=6b7a79732035343a38313a3332203931 XMM08=3d656e696c646d632022656369767265 XMM09=00000000000000000000000000000000 XMM10=00000000000000000000000000000000 XMM11=00000000000000000000000000000000 XMM12=00000000000000000000000000000000 XMM13=00000000000000000000000000000000 XMM14=00000000000000000000000000000000 XMM15=00000000000000000000000000000000 info registers vcpu 1 RAX=ffff88806cf35000 RBX=0000000000000001 RCX=ffffffff8450c50e RDX=ffffed100d9e6a01 RSI=0000000000000004 RDI=ffffffff812889a5 RBP=dffffc0000000000 RSP=ffff888008e27e70 R8 =0000000000000000 R9 =ffffed100d9e6a00 R10=ffff88806cf35003 R11=ffff888008c58400 R12=ffffffff85d3bed0 R13=1ffff110011c4fd3 R14=0000000000000000 R15=0000000000000000 RIP=ffffffff8450d49f RFL=00000246 [---Z-P-] CPL=0 II=0 A20=1 SMM=0 HLT=1 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=00007fe42e5ad050 CR3=000000000c4ae000 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=887ef75022717ea33d46b0dd0d433aa3 XMM02=000000000011d328eff9b2d0a8fce9cb XMM03=000000000011d3f82c67c8bc2e329bc3 XMM04=de5578602e9f73cc00000000000ae988 XMM05=dfcdbad4f1609c370000000000133dd0 XMM06=83e2049536436ec20000000000132fa8 XMM07=e042d86d42eb936e00000000001247c8 XMM08=6a134fe34347ad67000000000011d3f8 XMM09=00000000000000000000000000000000 XMM10=00000000000000000000000000000000 XMM11=00000000000000000000000000000000 XMM12=00000000000000000000000000000000 XMM13=00000000000000000000000000000000 XMM14=00000000000000000000000000000000 XMM15=00000000000000000000000000000000