Debian GNU/Linux 11 syzkaller ttyS0 syzkaller login: [ 31.150547] BUG: Bad rss-counter state mm:0000000031dd5d12 type:MM_FILEPAGES val:33 [ 31.151583] BUG: Bad rss-counter state mm:0000000031dd5d12 type:MM_ANONPAGES val:22 [ 31.185537] ================================================================== [ 31.186656] BUG: KASAN: slab-use-after-free in vma_interval_tree_remove+0xc75/0xec0 [ 31.187717] Read of size 8 at addr ffff88800e20ac20 by task sshd/221 [ 31.188624] [ 31.188842] CPU: 1 PID: 221 Comm: sshd Not tainted 6.4.0-rc7-next-20230620 #1 [ 31.189718] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014 [ 31.190835] Call Trace: [ 31.191193] [ 31.191545] dump_stack_lvl+0x91/0xf0 [ 31.192137] print_report+0xcc/0x620 [ 31.192719] ? __virt_addr_valid+0x102/0x340 [ 31.193339] ? vma_interval_tree_remove+0xc75/0xec0 [ 31.194043] ? vma_interval_tree_remove+0xc75/0xec0 [ 31.194771] kasan_report+0xbe/0xf0 [ 31.195281] ? vma_interval_tree_remove+0xc75/0xec0 [ 31.195985] vma_interval_tree_remove+0xc75/0xec0 [ 31.196665] vma_prepare+0xc54/0x11a0 [ 31.197224] __split_vma+0x5af/0x950 [ 31.197747] ? __pfx___split_vma+0x10/0x10 [ 31.198303] ? find_held_lock+0x2c/0x110 [ 31.198825] do_vmi_align_munmap+0x2ba/0x11f0 [ 31.199386] ? lock_is_held_type+0x9f/0x120 [ 31.199926] ? __pfx_do_vmi_align_munmap+0x10/0x10 [ 31.200535] ? mtree_range_walk+0x632/0x900 [ 31.201097] ? mas_walk+0x5c7/0x7c0 [ 31.201577] do_vmi_munmap+0x1f1/0x2b0 [ 31.202074] mmap_region+0x1f9/0x2660 [ 31.202583] ? vm_mmap_pgoff+0x15c/0x3a0 [ 31.203107] ? __pfx_arch_get_unmapped_area_topdown+0x10/0x10 [ 31.203822] ? __pfx_lock_acquire+0x10/0x10 [ 31.204353] ? __pfx_mmap_region+0x10/0x10 [ 31.204882] ? security_mmap_addr+0x7d/0xa0 [ 31.205414] ? get_unmapped_area+0x1f5/0x3f0 [ 31.205964] do_mmap+0x854/0xf00 [ 31.206410] vm_mmap_pgoff+0x1a6/0x3a0 [ 31.206912] ? __pfx_vm_mmap_pgoff+0x10/0x10 [ 31.207476] ksys_mmap_pgoff+0x3af/0x500 [ 31.207985] do_syscall_64+0x3f/0x90 [ 31.208469] entry_SYSCALL_64_after_hwframe+0x6e/0xd8 [ 31.209120] RIP: 0033:0x7f3f3a91dd82 [ 31.209580] 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 [ 31.211728] RSP: 002b:00007ffdd934dab8 EFLAGS: 00000206 ORIG_RAX: 0000000000000009 [ 31.212634] RAX: ffffffffffffffda RBX: 0000000000000812 RCX: 00007f3f3a91dd82 [ 31.213492] RDX: 0000000000000005 RSI: 0000000000001000 RDI: 00007f3f39d57000 [ 31.214562] RBP: 00007f3f39d57000 R08: 0000000000000009 R09: 0000000000001000 [ 31.215423] R10: 0000000000000812 R11: 0000000000000206 R12: 000056257b190f70 [ 31.216281] R13: 00007ffdd934dad0 R14: 00007ffdd934db00 R15: 00007ffdd934de60 [ 31.217147] [ 31.217439] [ 31.217656] Allocated by task 214: [ 31.218095] kasan_save_stack+0x22/0x50 [ 31.218608] kasan_set_track+0x25/0x30 [ 31.219110] __kasan_slab_alloc+0x59/0x70 [ 31.219636] kmem_cache_alloc+0x16b/0x370 [ 31.220166] vm_area_dup+0x20/0x160 [ 31.220623] __split_vma+0x170/0x950 [ 31.221093] split_vma+0xc6/0x110 [ 31.221531] mprotect_fixup+0x8d2/0xb30 [ 31.222032] do_mprotect_pkey+0x87e/0xd40 [ 31.222587] __x64_sys_mprotect+0x78/0xc0 [ 31.223109] do_syscall_64+0x3f/0x90 [ 31.223590] entry_SYSCALL_64_after_hwframe+0x6e/0xd8 [ 31.224236] [ 31.224453] Freed by task 214: [ 31.224843] kasan_save_stack+0x22/0x50 [ 31.225351] kasan_set_track+0x25/0x30 [ 31.225847] kasan_save_free_info+0x2b/0x50 [ 31.226386] __kasan_slab_free+0x10a/0x190 [ 31.226919] kmem_cache_free+0x10d/0x4d0 [ 31.227434] rcu_core+0x8c8/0x2860 [ 31.227879] __do_softirq+0x1b7/0x7d4 [ 31.228361] [ 31.228577] Last potentially related work creation: [ 31.229170] kasan_save_stack+0x22/0x50 [ 31.229674] __kasan_record_aux_stack+0x8e/0xa0 [ 31.230259] __call_rcu_common.constprop.0+0x6a/0xb90 [ 31.230910] remove_vma+0x139/0x170 [ 31.231360] do_vmi_align_munmap+0xd4a/0x11f0 [ 31.231917] do_vmi_munmap+0x1f1/0x2b0 [ 31.232402] __vm_munmap+0x138/0x3a0 [ 31.232866] __x64_sys_munmap+0x59/0x80 [ 31.233358] do_syscall_64+0x3f/0x90 [ 31.233835] entry_SYSCALL_64_after_hwframe+0x6e/0xd8 [ 31.234496] [ 31.234709] Second to last potentially related work creation: [ 31.235397] kasan_save_stack+0x22/0x50 [ 31.235897] __kasan_record_aux_stack+0x8e/0xa0 [ 31.236470] __call_rcu_common.constprop.0+0x6a/0xb90 [ 31.237110] remove_vma+0x139/0x170 [ 31.237574] do_vmi_align_munmap+0xd4a/0x11f0 [ 31.238139] do_vmi_munmap+0x1f1/0x2b0 [ 31.238641] mmap_region+0x1f9/0x2660 [ 31.239119] do_mmap+0x854/0xf00 [ 31.239555] vm_mmap_pgoff+0x1a6/0x3a0 [ 31.240047] ksys_mmap_pgoff+0x3af/0x500 [ 31.240554] do_syscall_64+0x3f/0x90 [ 31.241043] entry_SYSCALL_64_after_hwframe+0x6e/0xd8 [ 31.241690] [ 31.241905] The buggy address belongs to the object at ffff88800e20abc8 [ 31.241905] which belongs to the cache vm_area_struct of size 168 [ 31.243402] The buggy address is located 88 bytes inside of [ 31.243402] freed 168-byte region [ffff88800e20abc8, ffff88800e20ac70) [ 31.244825] [ 31.245042] The buggy address belongs to the physical page: [ 31.245708] page:000000000ac54484 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0xe20a [ 31.246812] memcg:ffff88800ddf6801 [ 31.247245] flags: 0x100000000000200(slab|node=0|zone=1) [ 31.247896] page_type: 0xffffffff() [ 31.248348] raw: 0100000000000200 ffff8880087a0c80 dead000000000100 dead000000000122 [ 31.249268] raw: 0000000000000000 0000000000110011 00000001ffffffff ffff88800ddf6801 [ 31.250184] page dumped because: kasan: bad access detected [ 31.250841] [ 31.251053] Memory state around the buggy address: [ 31.251627] ffff88800e20ab00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 31.252480] ffff88800e20ab80: 00 fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb [ 31.253326] >ffff88800e20ac00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fc fc [ 31.254188] ^ [ 31.254712] ffff88800e20ac80: fc fc fc fc fc fc fa fb fb fb fb fb fb fb fb fb [ 31.255611] ffff88800e20ad00: fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc fc [ 31.256458] ================================================================== [ 31.257474] Disabling lock debugging due to kernel taint [ 33.406774] BUG: Bad rss-counter state mm:000000001eed4f97 type:MM_FILEPAGES val:33 [ 33.407995] BUG: Bad rss-counter state mm:000000001eed4f97 type:MM_ANONPAGES val:22 [ 33.871019] BUG: Bad rss-counter state mm:00000000c37a74ea type:MM_FILEPAGES val:33 [ 33.872103] BUG: Bad rss-counter state mm:00000000c37a74ea type:MM_ANONPAGES val:22 Warning: Permanently added '[localhost]:29909' (ECDSA) to the list of known hosts. 2023/06/20 12:31:23 fuzzer started 2023/06/20 12:31:24 dialing manager at localhost:36067 2023/06/20 12:31:24 checking machine... 2023/06/20 12:31:24 checking revisions... [ 34.607375] kmemleak: Automatic memory scanning thread ended 2023/06/20 12:31:24 testing simple program... [ 34.661369] cgroup: Unknown subsys name 'net' [ 34.697129] cgroup: Unknown subsys name 'rlimit' executing program executing program executing program VM DIAGNOSIS: 12:31:23 Registers: info registers vcpu 0 RAX=ffff88806ce35000 RBX=0000000000000000 RCX=ffffffff8451250e RDX=ffffed100d9c6a01 RSI=0000000000000004 RDI=ffffffff81288ac5 RBP=dffffc0000000000 RSP=ffffffff85407e10 R8 =0000000000000000 R9 =ffffed100d9c6a00 R10=ffff88806ce35003 R11=ffff888008c04000 R12=ffffffff85d3d350 R13=1ffffffff0a80fc7 R14=0000000000000000 R15=0000000000000000 RIP=ffffffff8451349f 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=00007ffcef6422d8 CR3=0000000016b20000 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=2033323a31333a3231203032206e754a XMM01=657463656e6e6f63736944203a5d3033 XMM02=302e303120746f6f722072657375206d XMM03=203a5d3033325b646873732072656c6c XMM04=69662068637573206f4e203a656c6163 XMM05=3a656c696620766e65206e65706f206f XMM06=65733a6468737328766e655f6d617020 XMM07=6b7a79732033323a31333a3231203032 XMM08=3d656e696c646d632022656369767265 XMM09=00000000000000000000000000000000 XMM10=00000000000000000000000000000000 XMM11=00000000000000000000000000000000 XMM12=00000000000000000000000000000000 XMM13=00000000000000000000000000000000 XMM14=00000000000000000000000000000000 XMM15=00000000000000000000000000000000 info registers vcpu 1 RAX=dffffc0000000000 RBX=0000000000000001 RCX=ffffffff861390a8 RDX=1ffff11001b0be4f RSI=1ffff11001b0be4e RDI=1ffff11001b0be4e RBP=ffff88800d85f270 RSP=ffff88800d85f1a8 R8 =ffffffff861390ac R9 =ffff88800d85f258 R10=0000000000038001 R11=0000000000020de5 R12=ffff88800d85f278 R13=ffff88800d85f260 R14=ffff88800d85f5a0 R15=ffff88800d85f218 RIP=ffffffff811310d4 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 00007fea66e16900 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=00007eff32038650 CR3=000000000c6f6000 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=ffffffffffffffffffffffffffffffff XMM01=30306234386136303638616663356134 XMM02=38303062343861363036386166633561 XMM03=2f6c616e72756f6a2f676f6c2f6e7572 XMM04=b13b6c2775f5a52900000000000ae988 XMM05=64126000032027920000000000133f28 XMM06=c291bd5c70af25b900000000001329a8 XMM07=00000000000000000000000000000000 XMM08=415453454d49545f454d49544c414552 XMM09=00000000000000000000000000000000 XMM10=20200000000020202020202020200000 XMM11=00000000000000000000000000000000 XMM12=00000000000000000000000000000000 XMM13=00000000000000000000000000000000 XMM14=00000000000000000000000000000000 XMM15=00000000000000000000000000000000