[ 32.934762] BUG: Bad rss-counter state mm:00000000c8972d65 type:MM_FILEPAGES val:33 [ 32.935959] BUG: Bad rss-counter state mm:00000000c8972d65 type:MM_ANONPAGES val:22 Debian GNU/Linux 11 syzkaller ttyS0 syzkaller login: [ 33.131504] ================================================================== [ 33.132716] BUG: KASAN: slab-use-after-free in vma_interval_tree_remove+0xc75/0xec0 [ 33.134079] Read of size 8 at addr ffff88800d50ec20 by task sshd/218 [ 33.135070] [ 33.135353] CPU: 1 PID: 218 Comm: sshd Not tainted 6.4.0-rc7-next-20230619 #1 [ 33.136450] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014 [ 33.137675] Call Trace: [ 33.138103] [ 33.138467] dump_stack_lvl+0x91/0xf0 [ 33.139093] print_report+0xcc/0x620 [ 33.139725] ? __virt_addr_valid+0x102/0x340 [ 33.140402] ? vma_interval_tree_remove+0xc75/0xec0 [ 33.141229] ? vma_interval_tree_remove+0xc75/0xec0 [ 33.142069] kasan_report+0xbe/0xf0 [ 33.142730] ? vma_interval_tree_remove+0xc75/0xec0 [ 33.143593] vma_interval_tree_remove+0xc75/0xec0 [ 33.144444] vma_prepare+0xc54/0x11a0 [ 33.145096] __split_vma+0x5af/0x950 [ 33.145729] ? __pfx___split_vma+0x10/0x10 [ 33.146445] ? find_held_lock+0x2c/0x110 [ 33.147128] do_vmi_align_munmap+0x2ba/0x11f0 [ 33.147884] ? lock_is_held_type+0x9f/0x120 [ 33.148579] ? __pfx_do_vmi_align_munmap+0x10/0x10 [ 33.149357] ? mtree_range_walk+0x632/0x900 [ 33.150079] ? mas_walk+0x5c7/0x7c0 [ 33.150694] do_vmi_munmap+0x1f1/0x2b0 [ 33.151327] mmap_region+0x1f9/0x2660 [ 33.151974] ? vm_mmap_pgoff+0x15c/0x3a0 [ 33.152630] ? __pfx_arch_get_unmapped_area_topdown+0x10/0x10 [ 33.153558] ? __pfx_lock_acquire+0x10/0x10 [ 33.154245] ? __pfx_mmap_region+0x10/0x10 [ 33.154940] ? security_mmap_addr+0x7d/0xa0 [ 33.155628] ? get_unmapped_area+0x1f5/0x3f0 [ 33.156215] do_mmap+0x854/0xf00 [ 33.156664] vm_mmap_pgoff+0x1a6/0x3a0 [ 33.157158] ? __pfx_vm_mmap_pgoff+0x10/0x10 [ 33.157725] ksys_mmap_pgoff+0x3af/0x500 [ 33.158236] do_syscall_64+0x3f/0x90 [ 33.158710] entry_SYSCALL_64_after_hwframe+0x6e/0xd8 [ 33.159370] RIP: 0033:0x7f778457fd82 [ 33.159850] 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 [ 33.161998] RSP: 002b:00007ffed538a458 EFLAGS: 00000206 ORIG_RAX: 0000000000000009 [ 33.162900] RAX: ffffffffffffffda RBX: 0000000000000812 RCX: 00007f778457fd82 [ 33.163792] RDX: 0000000000000005 RSI: 0000000000001000 RDI: 00007f77839b9000 [ 33.164641] RBP: 00007f77839b9000 R08: 0000000000000009 R09: 0000000000001000 [ 33.165489] R10: 0000000000000812 R11: 0000000000000206 R12: 000055a96fa80f70 [ 33.166347] R13: 00007ffed538a470 R14: 00007ffed538a4a0 R15: 00007ffed538a800 [ 33.167202] [ 33.167501] [ 33.167728] Allocated by task 211: [ 33.168154] kasan_save_stack+0x22/0x50 [ 33.168666] kasan_set_track+0x25/0x30 [ 33.169161] __kasan_slab_alloc+0x59/0x70 [ 33.169692] kmem_cache_alloc+0x16b/0x370 [ 33.170211] vm_area_dup+0x20/0x160 [ 33.170664] __split_vma+0x170/0x950 [ 33.171131] split_vma+0xc6/0x110 [ 33.171571] mprotect_fixup+0x8d2/0xb30 [ 33.172088] do_mprotect_pkey+0x87e/0xd40 [ 33.172609] __x64_sys_mprotect+0x78/0xc0 [ 33.173136] do_syscall_64+0x3f/0x90 [ 33.173611] entry_SYSCALL_64_after_hwframe+0x6e/0xd8 [ 33.174256] [ 33.174471] Freed by task 211: [ 33.174870] kasan_save_stack+0x22/0x50 [ 33.175376] kasan_set_track+0x25/0x30 [ 33.175890] kasan_save_free_info+0x2b/0x50 [ 33.176427] __kasan_slab_free+0x10a/0x190 [ 33.176969] kmem_cache_free+0x10d/0x4d0 [ 33.177485] rcu_core+0x8c8/0x2860 [ 33.177933] __do_softirq+0x1b7/0x7d4 [ 33.178417] [ 33.178644] Last potentially related work creation: [ 33.179247] kasan_save_stack+0x22/0x50 [ 33.179757] __kasan_record_aux_stack+0x8e/0xa0 [ 33.180337] __call_rcu_common.constprop.0+0x6a/0xb90 [ 33.180977] remove_vma+0x139/0x170 [ 33.181433] do_vmi_align_munmap+0xd4a/0x11f0 [ 33.181992] do_vmi_munmap+0x1f1/0x2b0 [ 33.182475] __vm_munmap+0x138/0x3a0 [ 33.182944] __x64_sys_munmap+0x59/0x80 [ 33.183440] do_syscall_64+0x3f/0x90 [ 33.183926] entry_SYSCALL_64_after_hwframe+0x6e/0xd8 [ 33.184571] [ 33.184786] The buggy address belongs to the object at ffff88800d50ebc8 [ 33.184786] which belongs to the cache vm_area_struct of size 168 [ 33.186272] The buggy address is located 88 bytes inside of [ 33.186272] freed 168-byte region [ffff88800d50ebc8, ffff88800d50ec70) [ 33.187700] [ 33.187916] The buggy address belongs to the physical page: [ 33.188595] page:00000000db642ad5 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0xd50e [ 33.189668] memcg:ffff888009e82b01 [ 33.190095] flags: 0x100000000000200(slab|node=0|zone=1) [ 33.190755] page_type: 0xffffffff() [ 33.191207] raw: 0100000000000200 ffff88800879fc80 dead000000000122 0000000000000000 [ 33.192153] raw: 0000000000000000 0000000000110011 00000001ffffffff ffff888009e82b01 [ 33.193054] page dumped because: kasan: bad access detected [ 33.193718] [ 33.193934] Memory state around the buggy address: [ 33.194518] ffff88800d50eb00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 33.195384] ffff88800d50eb80: 00 fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb [ 33.196253] >ffff88800d50ec00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fc fc [ 33.197109] ^ [ 33.197641] ffff88800d50ec80: fc fc fc fc fc fc fa fb fb fb fb fb fb fb fb fb [ 33.198515] ffff88800d50ed00: fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc fc [ 33.199380] ================================================================== [ 33.200920] Disabling lock debugging due to kernel taint [ 35.351601] BUG: Bad rss-counter state mm:00000000ac72fa82 type:MM_FILEPAGES val:33 [ 35.352430] BUG: Bad rss-counter state mm:00000000ac72fa82 type:MM_ANONPAGES val:22 [ 35.759408] BUG: Bad rss-counter state mm:00000000743b0daa type:MM_FILEPAGES val:33 [ 35.760541] BUG: Bad rss-counter state mm:00000000743b0daa type:MM_ANONPAGES val:22 Warning: Permanently added '[localhost]:28569' (ECDSA) to the list of known hosts. 2023/06/20 02:37:08 fuzzer started 2023/06/20 02:37:08 dialing manager at localhost:44161 2023/06/20 02:37:08 checking machine... 2023/06/20 02:37:08 checking revisions... [ 36.570341] kmemleak: Automatic memory scanning thread ended 2023/06/20 02:37:09 testing simple program... [ 36.623815] cgroup: Unknown subsys name 'net' [ 36.670068] cgroup: Unknown subsys name 'rlimit' executing program executing program executing program VM DIAGNOSIS: 02:37:06 Registers: info registers vcpu 0 RAX=ffff88801462c000 RBX=ffff88801a0ce788 RCX=1ffff11001287886 RDX=dffffc0000000000 RSI=ffff888014631800 RDI=ffff88801a0ce7b8 RBP=ffff88800943c400 RSP=ffff888019a4fc28 R8 =0000000000000001 R9 =0000000000000246 R10=0000000000000003 R11=00000000000b6996 R12=ffff888014631000 R13=0000000000000000 R14=ffff888019a89768 R15=ffff888019a89720 RIP=ffffffff81847508 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 00007f90c552d900 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=00007ffed6c4b000 CR3=0000000016872000 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=74696d7265705f6d61703d73726f746e XMM02=000000000000000000000000000000ff XMM03=5320444f4854454d5f54505952434e45 XMM04=40404040404040404040404040404040 XMM05=5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a XMM06=20202020202020202020202020202020 XMM07=00000000000000000000000000000000 XMM08=61662029286e65706f5f746964756100 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=00007fa640c39fb0 CR3=0000000009662000 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=0eb2c410ffcc1681314a7dc453e23fc2 XMM02=000000000011d028eff9b2d0a8fce9cb XMM03=000000000011d0f82c67c8bc2e329bc3 XMM04=7857c34f383607d400000000000ae988 XMM05=3261f01dce38f9a80000000000134868 XMM06=bdf2e299e47b49d50000000000133920 XMM07=e042d86d42eb936e00000000001244e8 XMM08=37bc290892be28c3000000000011d0f8 XMM09=00000000000000000000000000000000 XMM10=20200000000020202020202020200000 XMM11=00000000000000000000000000000000 XMM12=00000000000000000000000000000000 XMM13=00000000000000000000000000000000 XMM14=00000000000000000000000000000000 XMM15=00000000000000000000000000000000