[ 31.930008] BUG: Bad rss-counter state mm:000000000c98fb8f type:MM_FILEPAGES val:33 [ 31.932129] BUG: Bad rss-counter state mm:000000000c98fb8f type:MM_ANONPAGES val:22 Debian GNU/Linux 11 syzkaller ttyS0 syzkaller login: [ 32.105288] ================================================================== [ 32.106187] BUG: KASAN: slab-use-after-free in vma_interval_tree_remove+0xc75/0xec0 [ 32.107119] Read of size 8 at addr ffff88800d854ed8 by task sshd/219 [ 32.107889] [ 32.108104] CPU: 0 PID: 219 Comm: sshd Not tainted 6.4.0-rc7-next-20230619 #1 [ 32.108996] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014 [ 32.109974] Call Trace: [ 32.110292] [ 32.110574] dump_stack_lvl+0x91/0xf0 [ 32.111074] print_report+0xcc/0x620 [ 32.111554] ? __virt_addr_valid+0x102/0x340 [ 32.112115] ? vma_interval_tree_remove+0xc75/0xec0 [ 32.112753] ? vma_interval_tree_remove+0xc75/0xec0 [ 32.113366] kasan_report+0xbe/0xf0 [ 32.113841] ? vma_interval_tree_remove+0xc75/0xec0 [ 32.114459] vma_interval_tree_remove+0xc75/0xec0 [ 32.115059] vma_prepare+0xc54/0x11a0 [ 32.115533] __split_vma+0x5af/0x950 [ 32.116005] ? __pfx___split_vma+0x10/0x10 [ 32.116534] ? find_held_lock+0x2c/0x110 [ 32.117069] do_vmi_align_munmap+0x2ba/0x11f0 [ 32.117644] ? lock_is_held_type+0x9f/0x120 [ 32.118184] ? __pfx_do_vmi_align_munmap+0x10/0x10 [ 32.118789] ? mtree_range_walk+0x632/0x900 [ 32.119335] ? mas_walk+0x5c7/0x7c0 [ 32.119804] do_vmi_munmap+0x1f1/0x2b0 [ 32.120311] mmap_region+0x1f9/0x2660 [ 32.120792] ? vm_mmap_pgoff+0x15c/0x3a0 [ 32.121306] ? __pfx_arch_get_unmapped_area_topdown+0x10/0x10 [ 32.122013] ? __pfx_lock_acquire+0x10/0x10 [ 32.122548] ? __pfx_mmap_region+0x10/0x10 [ 32.123085] ? security_mmap_addr+0x7d/0xa0 [ 32.123614] ? get_unmapped_area+0x1f5/0x3f0 [ 32.124163] do_mmap+0x854/0xf00 [ 32.124644] vm_mmap_pgoff+0x1a6/0x3a0 [ 32.125143] ? __pfx_vm_mmap_pgoff+0x10/0x10 [ 32.125706] ksys_mmap_pgoff+0x3af/0x500 [ 32.126220] do_syscall_64+0x3f/0x90 [ 32.126710] entry_SYSCALL_64_after_hwframe+0x6e/0xd8 [ 32.127379] RIP: 0033:0x7f7c4b000d82 [ 32.127838] 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 [ 32.129998] RSP: 002b:00007ffdc7a601c8 EFLAGS: 00000206 ORIG_RAX: 0000000000000009 [ 32.130915] RAX: ffffffffffffffda RBX: 0000000000000812 RCX: 00007f7c4b000d82 [ 32.131778] RDX: 0000000000000005 RSI: 0000000000001000 RDI: 00007f7c4a43a000 [ 32.132647] RBP: 00007f7c4a43a000 R08: 0000000000000009 R09: 0000000000001000 [ 32.133503] R10: 0000000000000812 R11: 0000000000000206 R12: 000055a6f8480d90 [ 32.134350] R13: 00007ffdc7a601e0 R14: 00007ffdc7a60210 R15: 00007ffdc7a60570 [ 32.135215] [ 32.135509] [ 32.135722] Allocated by task 212: [ 32.136161] kasan_save_stack+0x22/0x50 [ 32.136675] kasan_set_track+0x25/0x30 [ 32.137180] __kasan_slab_alloc+0x59/0x70 [ 32.137708] kmem_cache_alloc+0x16b/0x370 [ 32.138230] vm_area_dup+0x20/0x160 [ 32.138689] __split_vma+0x170/0x950 [ 32.139160] split_vma+0xc6/0x110 [ 32.139599] mprotect_fixup+0x8d2/0xb30 [ 32.140104] do_mprotect_pkey+0x87e/0xd40 [ 32.140655] __x64_sys_mprotect+0x78/0xc0 [ 32.141273] do_syscall_64+0x3f/0x90 [ 32.141764] entry_SYSCALL_64_after_hwframe+0x6e/0xd8 [ 32.142423] [ 32.142637] Freed by task 13: [ 32.143030] kasan_save_stack+0x22/0x50 [ 32.143538] kasan_set_track+0x25/0x30 [ 32.144038] kasan_save_free_info+0x2b/0x50 [ 32.144579] __kasan_slab_free+0x10a/0x190 [ 32.145119] kmem_cache_free+0x10d/0x4d0 [ 32.145637] rcu_core+0x8c8/0x2860 [ 32.146092] __do_softirq+0x1b7/0x7d4 [ 32.146578] [ 32.146799] Last potentially related work creation: [ 32.147407] kasan_save_stack+0x22/0x50 [ 32.147934] __kasan_record_aux_stack+0x8e/0xa0 [ 32.148527] __call_rcu_common.constprop.0+0x6a/0xb90 [ 32.149193] remove_vma+0x139/0x170 [ 32.149659] do_vmi_align_munmap+0xd4a/0x11f0 [ 32.150216] do_vmi_munmap+0x1f1/0x2b0 [ 32.150706] __vm_munmap+0x138/0x3a0 [ 32.151178] __x64_sys_munmap+0x59/0x80 [ 32.151689] do_syscall_64+0x3f/0x90 [ 32.152166] entry_SYSCALL_64_after_hwframe+0x6e/0xd8 [ 32.152829] [ 32.153048] The buggy address belongs to the object at ffff88800d854e80 [ 32.153048] which belongs to the cache vm_area_struct of size 168 [ 32.154536] The buggy address is located 88 bytes inside of [ 32.154536] freed 168-byte region [ffff88800d854e80, ffff88800d854f28) [ 32.155957] [ 32.156180] The buggy address belongs to the physical page: [ 32.156858] page:00000000600ac14b refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0xd854 [ 32.157951] memcg:ffff88800d8db901 [ 32.158372] anon flags: 0x100000000000200(slab|node=0|zone=1) [ 32.159090] page_type: 0xffffffff() [ 32.159554] raw: 0100000000000200 ffff88800879fc80 ffffea0000398f40 dead000000000005 [ 32.160492] raw: 0000000000000000 0000000000110011 00000001ffffffff ffff88800d8db901 [ 32.161414] page dumped because: kasan: bad access detected [ 32.162089] [ 32.162311] Memory state around the buggy address: [ 32.162905] ffff88800d854d80: fc fc fc fa fb fb fb fb fb fb fb fb fb fb fb fb [ 32.163782] ffff88800d854e00: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc [ 32.164656] >ffff88800d854e80: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 32.165518] ^ [ 32.166264] ffff88800d854f00: fb fb fb fb fb fc fc fc fc fc fc fc fc fc fc fc [ 32.167137] ffff88800d854f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 32.167999] ================================================================== [ 32.169035] Disabling lock debugging due to kernel taint [ 34.093166] BUG: Bad rss-counter state mm:00000000c53f4c43 type:MM_FILEPAGES val:33 [ 34.094152] BUG: Bad rss-counter state mm:00000000c53f4c43 type:MM_ANONPAGES val:22 [ 34.653642] BUG: Bad rss-counter state mm:000000006aa7f8b5 type:MM_FILEPAGES val:33 [ 34.654877] BUG: Bad rss-counter state mm:000000006aa7f8b5 type:MM_ANONPAGES val:22 Warning: Permanently added '[localhost]:5671' (ECDSA) to the list of known hosts. 2023/06/20 06:40:19 fuzzer started 2023/06/20 06:40:19 dialing manager at localhost:44161 2023/06/20 06:40:19 checking machine... 2023/06/20 06:40:19 checking revisions... [ 35.326706] kmemleak: Automatic memory scanning thread ended 2023/06/20 06:40:19 testing simple program... [ 35.370224] cgroup: Unknown subsys name 'net' [ 35.409796] cgroup: Unknown subsys name 'rlimit' executing program executing program executing program VM DIAGNOSIS: 06:40:17 Registers: info registers vcpu 0 RAX=ffff88806ce35000 RBX=0000000000000000 RCX=ffffffff8450c50e RDX=ffffed100d9c6a01 RSI=0000000000000004 RDI=ffffffff812889a5 RBP=dffffc0000000000 RSP=ffffffff85407e10 R8 =0000000000000000 R9 =ffffed100d9c6a00 R10=ffff88806ce35003 R11=ffff888008c58000 R12=ffffffff85d3bed0 R13=1ffffffff0a80fc7 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 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=00007fd135163470 CR3=000000001a030000 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=2038313a30343a3630203032206e754a XMM01=73732878696e755f6d6170203a5d3832 XMM02=65736f6c63206e6f6973736573203a29 XMM03=755f6d6170203a5d3832325b64687373 XMM04=69662068637573206f4e203a656c6163 XMM05=3a656c696620766e65206e65706f206f XMM06=65733a6468737328766e655f6d617020 XMM07=6b7a79732038313a30343a3630203032 XMM08=3d656e696c646d632022656369767265 XMM09=00000000000000000000000000000000 XMM10=00000000000000000000000000000000 XMM11=00000000000000000000000000000000 XMM12=00000000000000000000000000000000 XMM13=00000000000000000000000000000000 XMM14=00000000000000000000000000000000 XMM15=00000000000000000000000000000000 info registers vcpu 1 RAX=0000000080000000 RBX=ffff888019252068 RCX=0000000000000000 RDX=ffff88800a0bd1c0 RSI=ffffffff81ef0dc9 RDI=0000000000000003 RBP=ffff888015cf4bc0 RSP=ffff88800f637d00 R8 =0000000000000003 R9 =0000000000004000 R10=0000000000008000 R11=0000000000000000 R12=0000000000020000 R13=0000000000008000 R14=ffff88800ea3ba80 R15=ffff88801003a000 RIP=ffffffff814c0800 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 00007f791db4a900 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=00007fffb35ab000 CR3=0000000010144000 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=2c2c2c2c2c2c2c2c2c2c2c2c2c2c2c2c XMM01=00ff00000000000000000000000000ff XMM02=00ff00000000000000000000000000ff XMM03=655f6d61702c7374696d696c5f6d6170 XMM04=3d6c616e696d72657420322e322e302e XMM05=3d656d616e74736f682022646873732f XMM06=746f6f72223d746363612078756e696c XMM07=6e655f6d61702c7374696d696c5f6d61 XMM08=6500273d2720676e6974636570786500 XMM09=00000000000000000000000000000000 XMM10=00000000000000000000000000000000 XMM11=00000000000000000000000000000000 XMM12=00000000000000000000000000000000 XMM13=00000000000000000000000000000000 XMM14=00000000000000000000000000000000 XMM15=00000000000000000000000000000000