[ 32.918120] BUG: Bad rss-counter state mm:000000005de0deb5 type:MM_FILEPAGES val:33 [ 32.919128] BUG: Bad rss-counter state mm:000000005de0deb5 type:MM_ANONPAGES val:22 Debian GNU/Linux 11 syzkaller ttyS0 syzkaller login: [ 33.090354] ================================================================== [ 33.091257] BUG: KASAN: slab-use-after-free in vma_interval_tree_remove+0xc75/0xec0 [ 33.092182] Read of size 8 at addr ffff888009821c20 by task sshd/222 [ 33.092945] [ 33.093172] CPU: 1 PID: 222 Comm: sshd Not tainted 6.4.0-rc7-next-20230619 #1 [ 33.094172] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014 [ 33.095144] Call Trace: [ 33.095470] [ 33.095878] dump_stack_lvl+0x91/0xf0 [ 33.096522] print_report+0xcc/0x620 [ 33.097152] ? __virt_addr_valid+0x102/0x340 [ 33.097883] ? vma_interval_tree_remove+0xc75/0xec0 [ 33.098769] ? vma_interval_tree_remove+0xc75/0xec0 [ 33.099643] kasan_report+0xbe/0xf0 [ 33.100320] ? vma_interval_tree_remove+0xc75/0xec0 [ 33.101205] vma_interval_tree_remove+0xc75/0xec0 [ 33.102060] vma_prepare+0xc54/0x11a0 [ 33.102736] __split_vma+0x5af/0x950 [ 33.103405] ? __pfx___split_vma+0x10/0x10 [ 33.104168] ? find_held_lock+0x2c/0x110 [ 33.104888] do_vmi_align_munmap+0x2ba/0x11f0 [ 33.105713] ? lock_is_held_type+0x9f/0x120 [ 33.106350] ? __pfx_do_vmi_align_munmap+0x10/0x10 [ 33.107054] ? mtree_range_walk+0x632/0x900 [ 33.107673] ? mas_walk+0x5c7/0x7c0 [ 33.108234] do_vmi_munmap+0x1f1/0x2b0 [ 33.108789] mmap_region+0x1f9/0x2660 [ 33.109358] ? vm_mmap_pgoff+0x15c/0x3a0 [ 33.109952] ? __pfx_arch_get_unmapped_area_topdown+0x10/0x10 [ 33.110765] ? __pfx_lock_acquire+0x10/0x10 [ 33.111376] ? __pfx_mmap_region+0x10/0x10 [ 33.111985] ? security_mmap_addr+0x7d/0xa0 [ 33.112602] ? get_unmapped_area+0x1f5/0x3f0 [ 33.113256] do_mmap+0x854/0xf00 [ 33.113757] vm_mmap_pgoff+0x1a6/0x3a0 [ 33.114309] ? __pfx_vm_mmap_pgoff+0x10/0x10 [ 33.114931] ksys_mmap_pgoff+0x3af/0x500 [ 33.115489] do_syscall_64+0x3f/0x90 [ 33.116013] entry_SYSCALL_64_after_hwframe+0x6e/0xd8 [ 33.116716] RIP: 0033:0x7fc4dfcc7d82 [ 33.117250] 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 [ 33.119537] RSP: 002b:00007ffc2e186548 EFLAGS: 00000206 ORIG_RAX: 0000000000000009 [ 33.120533] RAX: ffffffffffffffda RBX: 0000000000000812 RCX: 00007fc4dfcc7d82 [ 33.121515] RDX: 0000000000000005 RSI: 0000000000001000 RDI: 00007fc4df101000 [ 33.122431] RBP: 00007fc4df101000 R08: 0000000000000009 R09: 0000000000001000 [ 33.123332] R10: 0000000000000812 R11: 0000000000000206 R12: 00005586f1b30ec0 [ 33.124258] R13: 00007ffc2e186560 R14: 00007ffc2e186590 R15: 00007ffc2e1868f0 [ 33.125186] [ 33.125507] [ 33.125730] Allocated by task 215: [ 33.126202] kasan_save_stack+0x22/0x50 [ 33.126749] kasan_set_track+0x25/0x30 [ 33.127292] __kasan_slab_alloc+0x59/0x70 [ 33.127845] kmem_cache_alloc+0x16b/0x370 [ 33.128412] vm_area_dup+0x20/0x160 [ 33.128902] __split_vma+0x170/0x950 [ 33.129438] split_vma+0xc6/0x110 [ 33.129907] mprotect_fixup+0x8d2/0xb30 [ 33.130453] do_mprotect_pkey+0x87e/0xd40 [ 33.131017] __x64_sys_mprotect+0x78/0xc0 [ 33.131590] do_syscall_64+0x3f/0x90 [ 33.132126] entry_SYSCALL_64_after_hwframe+0x6e/0xd8 [ 33.132822] [ 33.133079] Freed by task 215: [ 33.133501] kasan_save_stack+0x22/0x50 [ 33.134060] kasan_set_track+0x25/0x30 [ 33.134591] kasan_save_free_info+0x2b/0x50 [ 33.135233] __kasan_slab_free+0x10a/0x190 [ 33.135799] kmem_cache_free+0x10d/0x4d0 [ 33.136359] rcu_core+0x8c8/0x2860 [ 33.136852] __do_softirq+0x1b7/0x7d4 [ 33.137425] [ 33.137659] Last potentially related work creation: [ 33.138311] kasan_save_stack+0x22/0x50 [ 33.138854] __kasan_record_aux_stack+0x8e/0xa0 [ 33.139469] __call_rcu_common.constprop.0+0x6a/0xb90 [ 33.140186] remove_vma+0x139/0x170 [ 33.140685] do_vmi_align_munmap+0xd4a/0x11f0 [ 33.141301] do_vmi_munmap+0x1f1/0x2b0 [ 33.141822] __vm_munmap+0x138/0x3a0 [ 33.142329] __x64_sys_munmap+0x59/0x80 [ 33.142873] do_syscall_64+0x3f/0x90 [ 33.143393] entry_SYSCALL_64_after_hwframe+0x6e/0xd8 [ 33.144127] [ 33.144362] The buggy address belongs to the object at ffff888009821bc8 [ 33.144362] which belongs to the cache vm_area_struct of size 168 [ 33.145987] The buggy address is located 88 bytes inside of [ 33.145987] freed 168-byte region [ffff888009821bc8, ffff888009821c70) [ 33.147516] [ 33.147748] The buggy address belongs to the physical page: [ 33.148468] page:00000000427b711a refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x9821 [ 33.149652] memcg:ffff88800e877d01 [ 33.150138] flags: 0x100000000000200(slab|node=0|zone=1) [ 33.150831] page_type: 0xffffffff() [ 33.151344] raw: 0100000000000200 ffff88800879fc80 dead000000000100 dead000000000122 [ 33.152347] raw: 0000000000000000 0000000000110011 00000001ffffffff ffff88800e877d01 [ 33.153349] page dumped because: kasan: bad access detected [ 33.154084] [ 33.154325] Memory state around the buggy address: [ 33.154985] ffff888009821b00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 33.155936] ffff888009821b80: 00 fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb [ 33.156888] >ffff888009821c00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fc fc [ 33.157860] ^ [ 33.158457] ffff888009821c80: fc fc fc fc fc fc fa fb fb fb fb fb fb fb fb fb [ 33.159433] ffff888009821d00: fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc fc [ 33.160389] ================================================================== [ 33.161439] Disabling lock debugging due to kernel taint [ 35.961430] BUG: Bad rss-counter state mm:0000000068e7c3bd type:MM_FILEPAGES val:33 [ 35.963082] BUG: Bad rss-counter state mm:0000000068e7c3bd type:MM_ANONPAGES val:22 [ 36.424957] BUG: Bad rss-counter state mm:000000005749798b type:MM_FILEPAGES val:33 [ 36.426042] BUG: Bad rss-counter state mm:000000005749798b type:MM_ANONPAGES val:22 Warning: Permanently added '[localhost]:35302' (ECDSA) to the list of known hosts. 2023/06/19 20:51:43 fuzzer started 2023/06/19 20:51:43 dialing manager at localhost:44161 2023/06/19 20:51:43 checking machine... 2023/06/19 20:51:43 checking revisions... [ 37.178671] kmemleak: Automatic memory scanning thread ended 2023/06/19 20:51:43 testing simple program... [ 37.222575] cgroup: Unknown subsys name 'net' [ 37.263728] cgroup: Unknown subsys name 'rlimit' executing program executing program executing program VM DIAGNOSIS: 20:51:40 Registers: info registers vcpu 0 RAX=0000000000000000 RBX=0000000000000200 RCX=0000000000000000 RDX=ffff888015d80000 RSI=ffffffff81971057 RDI=0000000000000007 RBP=0000000000000504 RSP=ffff8880185af588 R8 =0000000000000007 R9 =0000000000000000 R10=0000000000000200 R11=00000000000b6996 R12=ffff888010110000 R13=0000000000000504 R14=0000000000001000 R15=0000000000000008 RIP=ffffffff81534324 RFL=00000093 [--S-A-C] 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 00007fe7d30da700 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=00007f50134323f0 CR3=0000000017246000 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=2032343a31353a3032203931206e754a XMM01=657463656e6e6f63736944203a5d3133 XMM02=302e303120746f6f722072657375206d XMM03=203a5d3133325b646873732072656c6c XMM04=69662068637573206f4e203a656c6163 XMM05=3a656c696620766e65206e65706f206f XMM06=65733a6468737328766e655f6d617020 XMM07=6b7a79732032343a31353a3032203931 XMM08=3d656e696c646d632022656369767265 XMM09=00000000000000000000000000000000 XMM10=00000000000000000000000000000000 XMM11=00000000000000000000000000000000 XMM12=00000000000000000000000000000000 XMM13=00000000000000000000000000000000 XMM14=00000000000000000000000000000000 XMM15=00000000000000000000000000000000 info registers vcpu 1 RAX=0000000080000000 RBX=dffffc0000000000 RCX=ffffffff81ef570a RDX=ffff888018648000 RSI=0000000000000000 RDI=0000000000000005 RBP=ffffffff852c8238 RSP=ffff88800c4a7dd8 R8 =0000000000000005 R9 =0000000000000000 R10=0000000000000000 R11=00000000000b6996 R12=0000000000000000 R13=0000000000000003 R14=0000000000000010 R15=ffff888019230b80 RIP=ffffffff814c01e1 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 00007faf2a42a900 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=00007faf2a9e20b0 CR3=000000000d37e000 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=25252525252525252525252525252525 XMM01=000000000000000000000000000000ff XMM02=000000000000000000000000000000ff XMM03=5320444f4854454d5f54505952434e45 XMM04=40404040404040404040404040404040 XMM05=5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a XMM06=20202020202020202020202020202020 XMM07=00000000000000000000000000000000 XMM08=662079726f6d656d20666f2074756f00 XMM09=00000000000000000000000000000000 XMM10=00000000000000000000000000000000 XMM11=00000000000000000000000000000000 XMM12=00000000000000000000000000000000 XMM13=00000000000000000000000000000000 XMM14=00000000000000000000000000000000 XMM15=00000000000000000000000000000000