Debian GNU/Linux 11 syzkaller ttyS0 syzkaller login: [ 34.995581] BUG: Bad rss-counter state mm:00000000a0019ad5 type:MM_FILEPAGES val:33 [ 34.996625] BUG: Bad rss-counter state mm:00000000a0019ad5 type:MM_ANONPAGES val:22 [ 35.155199] ================================================================== [ 35.156110] BUG: KASAN: slab-use-after-free in vma_interval_tree_remove+0xc75/0xec0 [ 35.157055] Read of size 8 at addr ffff88800f18e880 by task sshd/219 [ 35.157824] [ 35.158041] CPU: 1 PID: 219 Comm: sshd Not tainted 6.4.0-rc7-next-20230619 #1 [ 35.159078] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014 [ 35.160049] Call Trace: [ 35.160394] [ 35.160696] dump_stack_lvl+0x91/0xf0 [ 35.161185] print_report+0xcc/0x620 [ 35.161668] ? __virt_addr_valid+0x102/0x340 [ 35.162225] ? vma_interval_tree_remove+0xc75/0xec0 [ 35.162842] ? vma_interval_tree_remove+0xc75/0xec0 [ 35.163452] kasan_report+0xbe/0xf0 [ 35.163929] ? vma_interval_tree_remove+0xc75/0xec0 [ 35.164556] vma_interval_tree_remove+0xc75/0xec0 [ 35.165170] vma_prepare+0xc54/0x11a0 [ 35.165665] __split_vma+0x5af/0x950 [ 35.166137] ? __pfx___split_vma+0x10/0x10 [ 35.166671] ? find_held_lock+0x2c/0x110 [ 35.167195] do_vmi_align_munmap+0x2ba/0x11f0 [ 35.167792] ? lock_is_held_type+0x9f/0x120 [ 35.168351] ? __pfx_do_vmi_align_munmap+0x10/0x10 [ 35.168982] ? mtree_range_walk+0x632/0x900 [ 35.169551] ? mas_walk+0x5c7/0x7c0 [ 35.170032] do_vmi_munmap+0x1f1/0x2b0 [ 35.170541] mmap_region+0x1f9/0x2660 [ 35.171024] ? vm_mmap_pgoff+0x15c/0x3a0 [ 35.171542] ? __pfx_arch_get_unmapped_area_topdown+0x10/0x10 [ 35.172282] ? __pfx_lock_acquire+0x10/0x10 [ 35.172822] ? __pfx_mmap_region+0x10/0x10 [ 35.173354] ? security_mmap_addr+0x7d/0xa0 [ 35.173904] ? get_unmapped_area+0x1f5/0x3f0 [ 35.174464] do_mmap+0x854/0xf00 [ 35.174911] vm_mmap_pgoff+0x1a6/0x3a0 [ 35.175441] ? __pfx_vm_mmap_pgoff+0x10/0x10 [ 35.176034] ksys_mmap_pgoff+0x3af/0x500 [ 35.176548] do_syscall_64+0x3f/0x90 [ 35.177028] entry_SYSCALL_64_after_hwframe+0x6e/0xd8 [ 35.177681] RIP: 0033:0x7f0ad9c32d82 [ 35.178148] 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 [ 35.180297] RSP: 002b:00007ffe9581c778 EFLAGS: 00000206 ORIG_RAX: 0000000000000009 [ 35.181224] RAX: ffffffffffffffda RBX: 0000000000000812 RCX: 00007f0ad9c32d82 [ 35.182077] RDX: 0000000000000005 RSI: 0000000000001000 RDI: 00007f0ad906c000 [ 35.182934] RBP: 00007f0ad906c000 R08: 0000000000000009 R09: 0000000000001000 [ 35.183803] R10: 0000000000000812 R11: 0000000000000206 R12: 00005630dc263980 [ 35.184713] R13: 00007ffe9581c790 R14: 00007ffe9581c7c0 R15: 00007ffe9581cb20 [ 35.185588] [ 35.185880] [ 35.186094] Allocated by task 212: [ 35.186530] kasan_save_stack+0x22/0x50 [ 35.187037] kasan_set_track+0x25/0x30 [ 35.187535] __kasan_slab_alloc+0x59/0x70 [ 35.188049] kmem_cache_alloc+0x16b/0x370 [ 35.188567] vm_area_dup+0x20/0x160 [ 35.189018] __split_vma+0x170/0x950 [ 35.189483] split_vma+0xc6/0x110 [ 35.189918] mprotect_fixup+0x8d2/0xb30 [ 35.190413] do_mprotect_pkey+0x87e/0xd40 [ 35.190926] __x64_sys_mprotect+0x78/0xc0 [ 35.191445] do_syscall_64+0x3f/0x90 [ 35.191913] entry_SYSCALL_64_after_hwframe+0x6e/0xd8 [ 35.192572] [ 35.192787] Freed by task 13: [ 35.193175] kasan_save_stack+0x22/0x50 [ 35.193693] kasan_set_track+0x25/0x30 [ 35.194206] kasan_save_free_info+0x2b/0x50 [ 35.194742] __kasan_slab_free+0x10a/0x190 [ 35.195286] kmem_cache_free+0x10d/0x4d0 [ 35.195814] rcu_core+0x8c8/0x2860 [ 35.196270] __do_softirq+0x1b7/0x7d4 [ 35.196757] [ 35.196972] Last potentially related work creation: [ 35.197562] kasan_save_stack+0x22/0x50 [ 35.198079] __kasan_record_aux_stack+0x8e/0xa0 [ 35.198662] __call_rcu_common.constprop.0+0x6a/0xb90 [ 35.199311] remove_vma+0x139/0x170 [ 35.199766] do_vmi_align_munmap+0xd4a/0x11f0 [ 35.200438] do_vmi_munmap+0x1f1/0x2b0 [ 35.200935] __vm_munmap+0x138/0x3a0 [ 35.201404] __x64_sys_munmap+0x59/0x80 [ 35.201908] do_syscall_64+0x3f/0x90 [ 35.202396] entry_SYSCALL_64_after_hwframe+0x6e/0xd8 [ 35.203069] [ 35.203283] The buggy address belongs to the object at ffff88800f18e828 [ 35.203283] which belongs to the cache vm_area_struct of size 168 [ 35.204803] The buggy address is located 88 bytes inside of [ 35.204803] freed 168-byte region [ffff88800f18e828, ffff88800f18e8d0) [ 35.206211] [ 35.206427] The buggy address belongs to the physical page: [ 35.207081] page:0000000042ef15ea refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0xf18e [ 35.208172] memcg:ffff88800c593001 [ 35.208598] flags: 0x100000000000200(slab|node=0|zone=1) [ 35.209247] page_type: 0xffffffff() [ 35.209697] raw: 0100000000000200 ffff88800879fc80 dead000000000122 0000000000000000 [ 35.210614] raw: 0000000000000000 0000000000110011 00000001ffffffff ffff88800c593001 [ 35.211523] page dumped because: kasan: bad access detected [ 35.212192] [ 35.212409] Memory state around the buggy address: [ 35.212985] ffff88800f18e780: 00 00 00 00 00 00 00 00 00 00 00 00 00 fc fc fc [ 35.213837] ffff88800f18e800: fc fc fc fc fc fa fb fb fb fb fb fb fb fb fb fb [ 35.214686] >ffff88800f18e880: fb fb fb fb fb fb fb fb fb fb fc fc fc fc fc fc [ 35.215545] ^ [ 35.215953] ffff88800f18e900: fc fc fa fb fb fb fb fb fb fb fb fb fb fb fb fb [ 35.216824] ffff88800f18e980: fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc 00 [ 35.217672] ================================================================== [ 35.218687] Disabling lock debugging due to kernel taint [ 37.887598] BUG: Bad rss-counter state mm:00000000e3e3d4e2 type:MM_FILEPAGES val:33 [ 37.888865] BUG: Bad rss-counter state mm:00000000e3e3d4e2 type:MM_ANONPAGES val:22 [ 38.476962] BUG: Bad rss-counter state mm:0000000009fb891d type:MM_FILEPAGES val:33 [ 38.478117] BUG: Bad rss-counter state mm:0000000009fb891d type:MM_ANONPAGES val:22 Warning: Permanently added '[localhost]:21860' (ECDSA) to the list of known hosts. 2023/06/19 21:27:10 fuzzer started 2023/06/19 21:27:10 dialing manager at localhost:44161 2023/06/19 21:27:10 checking machine... 2023/06/19 21:27:10 checking revisions... [ 39.136271] kmemleak: Automatic memory scanning thread ended 2023/06/19 21:27:10 testing simple program... [ 39.182912] cgroup: Unknown subsys name 'net' [ 39.221306] cgroup: Unknown subsys name 'rlimit' executing program executing program executing program VM DIAGNOSIS: 21:27:06 Registers: info registers vcpu 0 RAX=ffff88801428f640 RBX=0000000000000001 RCX=0000000000000001 RDX=ffff88801428f501 RSI=ffff88801428f578 RDI=ffff88801428f578 RBP=ffff88801428f600 RSP=ffff88801428f4e8 R8 =0000000000000001 R9 =ffff88801428f5e8 R10=0000000000038001 R11=0000000000006097 R12=ffff88801428f608 R13=ffff88801428f5f0 R14=ffff88801428f578 R15=ffff88801428f5a8 RIP=ffffffff81131236 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 00007f181f947900 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=00007fff34c0f000 CR3=000000000c71c000 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=0000000000000001 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=00007f7bf8379750 CR3=00000000181e0000 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=2030313a37323a3132203931206e754a XMM01=73732878696e755f6d6170203a5d3832 XMM02=65736f6c63206e6f6973736573203a29 XMM03=755f6d6170203a5d3832325b64687373 XMM04=69662068637573206f4e203a656c6163 XMM05=3a656c696620766e65206e65706f206f XMM06=65733a6468737328766e655f6d617020 XMM07=6b7a79732039303a37323a3132203931 XMM08=3d656e696c646d632022656369767265 XMM09=00000000000000000000000000000000 XMM10=00000000000000000000000000000000 XMM11=00000000000000000000000000000000 XMM12=00000000000000000000000000000000 XMM13=00000000000000000000000000000000 XMM14=00000000000000000000000000000000 XMM15=00000000000000000000000000000000