Debian GNU/Linux 11 syzkaller ttyS0 syzkaller login: [ 31.964067] BUG: Bad rss-counter state mm:000000000e93602d type:MM_FILEPAGES val:33 [ 31.965193] BUG: Bad rss-counter state mm:000000000e93602d type:MM_ANONPAGES val:22 [ 32.144560] ================================================================== [ 32.145669] BUG: KASAN: slab-use-after-free in vma_interval_tree_remove+0xc75/0xec0 [ 32.146884] Read of size 8 at addr ffff88800fcbf058 by task sshd/218 [ 32.147777] [ 32.148012] CPU: 0 PID: 218 Comm: sshd Not tainted 6.4.0-rc7-next-20230619 #1 [ 32.148963] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014 [ 32.150005] Call Trace: [ 32.150350] [ 32.150652] dump_stack_lvl+0x91/0xf0 [ 32.151191] print_report+0xcc/0x620 [ 32.151709] ? __virt_addr_valid+0x102/0x340 [ 32.152314] ? vma_interval_tree_remove+0xc75/0xec0 [ 32.152985] ? vma_interval_tree_remove+0xc75/0xec0 [ 32.153649] kasan_report+0xbe/0xf0 [ 32.154163] ? vma_interval_tree_remove+0xc75/0xec0 [ 32.154836] vma_interval_tree_remove+0xc75/0xec0 [ 32.155525] vma_prepare+0xc54/0x11a0 [ 32.156049] __split_vma+0x5af/0x950 [ 32.156560] ? __pfx___split_vma+0x10/0x10 [ 32.157129] ? find_held_lock+0x2c/0x110 [ 32.157690] do_vmi_align_munmap+0x2ba/0x11f0 [ 32.158296] ? lock_is_held_type+0x9f/0x120 [ 32.158884] ? __pfx_do_vmi_align_munmap+0x10/0x10 [ 32.159534] ? mtree_range_walk+0x632/0x900 [ 32.160130] ? mas_walk+0x5c7/0x7c0 [ 32.160646] do_vmi_munmap+0x1f1/0x2b0 [ 32.161174] mmap_region+0x1f9/0x2660 [ 32.161709] ? vm_mmap_pgoff+0x15c/0x3a0 [ 32.162262] ? __pfx_arch_get_unmapped_area_topdown+0x10/0x10 [ 32.163043] ? __pfx_lock_acquire+0x10/0x10 [ 32.163616] ? __pfx_mmap_region+0x10/0x10 [ 32.164189] ? security_mmap_addr+0x7d/0xa0 [ 32.164761] ? get_unmapped_area+0x1f5/0x3f0 [ 32.165360] do_mmap+0x854/0xf00 [ 32.165832] vm_mmap_pgoff+0x1a6/0x3a0 [ 32.166369] ? __pfx_vm_mmap_pgoff+0x10/0x10 [ 32.166988] ksys_mmap_pgoff+0x3af/0x500 [ 32.167539] do_syscall_64+0x3f/0x90 [ 32.168061] entry_SYSCALL_64_after_hwframe+0x6e/0xd8 [ 32.168756] RIP: 0033:0x7f9b88bc4d82 [ 32.169251] 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 [ 32.171554] RSP: 002b:00007fff32d4c2b8 EFLAGS: 00000206 ORIG_RAX: 0000000000000009 [ 32.172536] RAX: ffffffffffffffda RBX: 0000000000000812 RCX: 00007f9b88bc4d82 [ 32.173446] RDX: 0000000000000005 RSI: 0000000000001000 RDI: 00007f9b87ffe000 [ 32.174364] RBP: 00007f9b87ffe000 R08: 0000000000000009 R09: 0000000000001000 [ 32.175282] R10: 0000000000000812 R11: 0000000000000206 R12: 000055f1a12c5b20 [ 32.176196] R13: 00007fff32d4c2d0 R14: 00007fff32d4c300 R15: 00007fff32d4c660 [ 32.177121] [ 32.177437] [ 32.177664] Allocated by task 211: [ 32.178128] kasan_save_stack+0x22/0x50 [ 32.178667] kasan_set_track+0x25/0x30 [ 32.179210] __kasan_slab_alloc+0x59/0x70 [ 32.179775] kmem_cache_alloc+0x16b/0x370 [ 32.180334] vm_area_dup+0x20/0x160 [ 32.180829] __split_vma+0x170/0x950 [ 32.181338] split_vma+0xc6/0x110 [ 32.181813] mprotect_fixup+0x8d2/0xb30 [ 32.182355] do_mprotect_pkey+0x87e/0xd40 [ 32.182927] __x64_sys_mprotect+0x78/0xc0 [ 32.183490] do_syscall_64+0x3f/0x90 [ 32.184003] entry_SYSCALL_64_after_hwframe+0x6e/0xd8 [ 32.184700] [ 32.184927] Freed by task 211: [ 32.185346] kasan_save_stack+0x22/0x50 [ 32.185885] kasan_set_track+0x25/0x30 [ 32.186417] kasan_save_free_info+0x2b/0x50 [ 32.187013] __kasan_slab_free+0x10a/0x190 [ 32.187590] kmem_cache_free+0x10d/0x4d0 [ 32.188137] rcu_core+0x8c8/0x2860 [ 32.188618] __do_softirq+0x1b7/0x7d4 [ 32.189131] [ 32.189360] Last potentially related work creation: [ 32.189987] kasan_save_stack+0x22/0x50 [ 32.190531] __kasan_record_aux_stack+0x8e/0xa0 [ 32.191156] __call_rcu_common.constprop.0+0x6a/0xb90 [ 32.191847] remove_vma+0x139/0x170 [ 32.192339] do_vmi_align_munmap+0xd4a/0x11f0 [ 32.192939] do_vmi_munmap+0x1f1/0x2b0 [ 32.193463] __vm_munmap+0x138/0x3a0 [ 32.193973] __x64_sys_munmap+0x59/0x80 [ 32.194508] do_syscall_64+0x3f/0x90 [ 32.195031] entry_SYSCALL_64_after_hwframe+0x6e/0xd8 [ 32.195722] [ 32.195949] The buggy address belongs to the object at ffff88800fcbf000 [ 32.195949] which belongs to the cache vm_area_struct of size 168 [ 32.197529] The buggy address is located 88 bytes inside of [ 32.197529] freed 168-byte region [ffff88800fcbf000, ffff88800fcbf0a8) [ 32.199043] [ 32.199277] The buggy address belongs to the physical page: [ 32.199980] page:0000000060f51689 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0xfcbf [ 32.201145] memcg:ffff88800f12a501 [ 32.201601] anon flags: 0x100000000000200(slab|node=0|zone=1) [ 32.202354] page_type: 0xffffffff() [ 32.202836] raw: 0100000000000200 ffff88800879fc80 0000000000000000 0000000000000001 [ 32.203839] raw: 0000000000000000 0000000000110011 00000001ffffffff ffff88800f12a501 [ 32.204831] page dumped because: kasan: bad access detected [ 32.205535] [ 32.205766] Memory state around the buggy address: [ 32.206382] ffff88800fcbef00: fb fb fb fb fb fb fc fc fc fc fc fc fc fc fc fc [ 32.207333] ffff88800fcbef80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 32.208256] >ffff88800fcbf000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 32.209164] ^ [ 32.209945] ffff88800fcbf080: fb fb fb fb fb fc fc fc fc fc fc fc fc 00 00 00 [ 32.210880] ffff88800fcbf100: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 32.211806] ================================================================== [ 32.212931] Disabling lock debugging due to kernel taint [ 34.258820] BUG: Bad rss-counter state mm:00000000799908a5 type:MM_FILEPAGES val:33 [ 34.259603] BUG: Bad rss-counter state mm:00000000799908a5 type:MM_ANONPAGES val:22 [ 34.605779] BUG: Bad rss-counter state mm:000000002c56450a type:MM_FILEPAGES val:33 [ 34.606610] BUG: Bad rss-counter state mm:000000002c56450a type:MM_ANONPAGES val:22 Warning: Permanently added '[localhost]:1642' (ECDSA) to the list of known hosts. 2023/06/19 14:15:44 fuzzer started 2023/06/19 14:15:44 dialing manager at localhost:44161 2023/06/19 14:15:44 checking machine... 2023/06/19 14:15:44 checking revisions... [ 35.407135] kmemleak: Automatic memory scanning thread ended 2023/06/19 14:15:45 testing simple program... [ 35.457546] cgroup: Unknown subsys name 'net' [ 35.510755] cgroup: Unknown subsys name 'rlimit' executing program executing program executing program VM DIAGNOSIS: 14:15:44 Registers: info registers vcpu 0 RAX=00000000af683ead RBX=00000000481f4e0a RCX=ffff8880161876e0 RDX=0000000000000012 RSI=0000000000000018 RDI=00000000f200f2db RBP=ffff88800844f780 RSP=ffff888016187648 R8 =00000000268d4f0d R9 =fffffbfff0ba77da R10=ffffffff85d3bed7 R11=00000000000b6996 R12=0000000000000001 R13=0000000000092c40 R14=ffff8880161876b0 R15=0000000000000012 RIP=ffffffff82270edb RFL=00000282 [--S----] 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 00007fde4a9da700 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=00007fd5c6e58198 CR3=000000000e448000 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=2034343a35313a3431203931206e754a XMM01=73732878696e755f6d6170203a5d3732 XMM02=65736f6c63206e6f6973736573203a29 XMM03=755f6d6170203a5d3732325b64687373 XMM04=69662068637573206f4e203a656c6163 XMM05=3a656c696620766e65206e65706f206f XMM06=65733a6468737328766e655f6d617020 XMM07=6b7a79732034343a35313a3431203931 XMM08=3d656e696c646d632022656369767265 XMM09=00000000000000000000000000000000 XMM10=00000000000000000000000000000000 XMM11=00000000000000000000000000000000 XMM12=00000000000000000000000000000000 XMM13=00000000000000000000000000000000 XMM14=00000000000000000000000000000000 XMM15=00000000000000000000000000000000 info registers vcpu 1 RAX=1ffff11001b28d4e RBX=dffffc0000000000 RCX=0000000000000000 RDX=ffff888017e1b680 RSI=ffffffff817167c0 RDI=ffff88800d946a70 RBP=00007f27cb5fe008 RSP=ffff88800f26fde8 R8 =0000000000000005 R9 =0000000000000000 R10=0000000000000000 R11=0000000000000000 R12=ffff88800d9469f8 R13=ffffffff849385e0 R14=0000000000000040 R15=ffff888017e91bc0 RIP=ffffffff817167db 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 =0000 0000000000000000 00000000 00000000 DS =0000 0000000000000000 00000000 00000000 FS =0000 00007f27cb634900 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=00007f27cb5fe008 CR3=000000000d4fe000 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=652022746f6f72223d74636361207469 XMM02=3d6c616e696d72657420322e322e302e XMM03=3d656d616e74736f682022646873732f XMM04=40404040404040404040404040404040 XMM05=5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a XMM06=20202020202020202020202020202020 XMM07=00000000000000000000000000000000 XMM08=652075253d64692073253d706f000000 XMM09=00000000000000000000000000000000 XMM10=00000000000000000000000000000000 XMM11=00000000000000000000000000000000 XMM12=00000000000000000000000000000000 XMM13=00000000000000000000000000000000 XMM14=00000000000000000000000000000000 XMM15=00000000000000000000000000000000