syzkaller login: [ 30.287118] BUG: Bad rss-counter state mm:000000002c9f3949 type:MM_FILEPAGES val:33 [ 30.288086] BUG: Bad rss-counter state mm:000000002c9f3949 type:MM_ANONPAGES val:22 [ 30.444880] ================================================================== [ 30.445460] BUG: KASAN: slab-use-after-free in vma_interval_tree_remove+0xc75/0xec0 [ 30.446050] Read of size 8 at addr ffff88800c9b4968 by task sshd/222 [ 30.446523] [ 30.446661] CPU: 0 PID: 222 Comm: sshd Not tainted 6.4.0-rc7-next-20230620 #1 [ 30.447373] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014 [ 30.447990] Call Trace: [ 30.448192] <TASK> [ 30.448371] dump_stack_lvl+0x91/0xf0 [ 30.448684] print_report+0xcc/0x620 [ 30.449001] ? __virt_addr_valid+0x102/0x340 [ 30.449352] ? vma_interval_tree_remove+0xc75/0xec0 [ 30.449750] ? vma_interval_tree_remove+0xc75/0xec0 [ 30.450160] kasan_report+0xbe/0xf0 [ 30.450482] ? vma_interval_tree_remove+0xc75/0xec0 [ 30.450991] vma_interval_tree_remove+0xc75/0xec0 [ 30.451376] vma_prepare+0xc54/0x11a0 [ 30.451688] __split_vma+0x5af/0x950 [ 30.451999] ? __pfx___split_vma+0x10/0x10 [ 30.452336] ? find_held_lock+0x2c/0x110 [ 30.452675] do_vmi_align_munmap+0x2ba/0x11f0 [ 30.453040] ? lock_is_held_type+0x9f/0x120 [ 30.453390] ? __pfx_do_vmi_align_munmap+0x10/0x10 [ 30.453789] ? mtree_range_walk+0x632/0x900 [ 30.454148] ? mas_walk+0x5c7/0x7c0 [ 30.454452] do_vmi_munmap+0x1f1/0x2b0 [ 30.457257] mmap_region+0x1f9/0x2660 [ 30.458133] ? vm_mmap_pgoff+0x15c/0x3a0 [ 30.458467] ? __pfx_arch_get_unmapped_area_topdown+0x10/0x10 [ 30.460391] ? __pfx_lock_acquire+0x10/0x10 [ 30.460750] ? __pfx_mmap_region+0x10/0x10 [ 30.461145] ? security_mmap_addr+0x7d/0xa0 [ 30.461485] ? get_unmapped_area+0x1f5/0x3f0 [ 30.461854] do_mmap+0x854/0xf00 [ 30.462136] vm_mmap_pgoff+0x1a6/0x3a0 [ 30.462452] ? __pfx_vm_mmap_pgoff+0x10/0x10 [ 30.463064] ksys_mmap_pgoff+0x3af/0x500 [ 30.466498] do_syscall_64+0x3f/0x90 [ 30.467412] entry_SYSCALL_64_after_hwframe+0x6e/0xd8 [ 30.467829] RIP: 0033:0x7f274d41fd82 [ 30.468165] 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 [ 30.472441] RSP: 002b:00007ffdd5829668 EFLAGS: 00000206 ORIG_RAX: 0000000000000009 [ 30.473074] RAX: ffffffffffffffda RBX: 0000000000000812 RCX: 00007f274d41fd82 [ 30.474697] RDX: 0000000000000005 RSI: 0000000000001000 RDI: 00007f274c859000 [ 30.476435] RBP: 00007f274c859000 R08: 0000000000000009 R09: 0000000000001000 [ 30.476991] R10: 0000000000000812 R11: 0000000000000206 R12: 0000558c25fd5ec0 [ 30.478609] R13: 00007ffdd5829680 R14: 00007ffdd58296b0 R15: 00007ffdd5829a10 [ 30.479173] </TASK> [ 30.480458] [ 30.480597] Allocated by task 215: [ 30.480872] kasan_save_stack+0x22/0x50 [ 30.481203] kasan_set_track+0x25/0x30 [ 30.482596] __kasan_slab_alloc+0x59/0x70 [ 30.483018] kmem_cache_alloc+0x16b/0x370 [ 30.484465] vm_area_dup+0x20/0x160 [ 30.484809] __split_vma+0x170/0x950 [ 30.485140] split_vma+0xc6/0x110 [ 30.486506] mprotect_fixup+0x8d2/0xb30 [ 30.486836] do_mprotect_pkey+0x87e/0xd40 [ 30.487224] __x64_sys_mprotect+0x78/0xc0 [ 30.488621] do_syscall_64+0x3f/0x90 [ 30.488957] entry_SYSCALL_64_after_hwframe+0x6e/0xd8 [ 30.490483] [ 30.490625] Freed by task 215: [ 30.490906] kasan_save_stack+0x22/0x50 [ 30.491232] kasan_set_track+0x25/0x30 [ 30.492614] kasan_save_free_info+0x2b/0x50 [ 30.492994] __kasan_slab_free+0x10a/0x190 [ 30.494417] kmem_cache_free+0x10d/0x4d0 [ 30.494758] rcu_core+0x8c8/0x2860 [ 30.495050] __do_softirq+0x1b7/0x7d4 [ 30.496411] [ 30.496556] Last potentially related work creation: [ 30.496924] kasan_save_stack+0x22/0x50 [ 30.498327] __kasan_record_aux_stack+0x8e/0xa0 [ 30.498827] __call_rcu_common.constprop.0+0x6a/0xb90 [ 30.500352] remove_vma+0x139/0x170 [ 30.500645] do_vmi_align_munmap+0xd4a/0x11f0 [ 30.501035] do_vmi_munmap+0x1f1/0x2b0 [ 30.502450] __vm_munmap+0x138/0x3a0 [ 30.502797] __x64_sys_munmap+0x59/0x80 [ 30.503130] do_syscall_64+0x3f/0x90 [ 30.504489] entry_SYSCALL_64_after_hwframe+0x6e/0xd8 [ 30.504914] [ 30.505092] The buggy address belongs to the object at ffff88800c9b4910 [ 30.505092] which belongs to the cache vm_area_struct of size 168 [ 30.507100] The buggy address is located 88 bytes inside of [ 30.507100] freed 168-byte region [ffff88800c9b4910, ffff88800c9b49b8) [ 30.509042] [ 30.509183] The buggy address belongs to the physical page: [ 30.510681] page:00000000e7a65873 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0xc9b4 [ 30.511506] memcg:ffff88800f0ab101 [ 30.511776] flags: 0x100000000000200(slab|node=0|zone=1) [ 30.512239] page_type: 0xffffffff() [ 30.513582] raw: 0100000000000200 ffff8880087a0c80 dead000000000122 0000000000000000 [ 30.514190] raw: 0000000000000000 0000000000110011 00000001ffffffff ffff88800f0ab101 [ 30.516828] page dumped because: kasan: bad access detected [ 30.517270] [ 30.517415] Memory state around the buggy address: [ 30.517790] ffff88800c9b4800: fc fc fc fc fc 00 00 00 00 00 00 00 00 00 00 00 [ 30.518359] ffff88800c9b4880: 00 00 00 00 00 00 00 00 00 00 fc fc fc fc fc fc [ 30.518932] >ffff88800c9b4900: fc fc fa fb fb fb fb fb fb fb fb fb fb fb fb fb [ 30.519484] ^ [ 30.519987] ffff88800c9b4980: fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc fa [ 30.520529] ffff88800c9b4a00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 30.521080] ================================================================== [ 30.522132] Disabling lock debugging due to kernel taint [ 35.535277] BUG: Bad rss-counter state mm:00000000091fd7ac type:MM_FILEPAGES val:33 [ 35.535950] BUG: Bad rss-counter state mm:00000000091fd7ac type:MM_ANONPAGES val:22 [ 36.579061] BUG: Bad rss-counter state mm:0000000026eab956 type:MM_FILEPAGES val:33 [ 36.581462] BUG: Bad rss-counter state mm:0000000026eab956 type:MM_ANONPAGES val:22 Warning: Permanently added '[localhost]:43488' (ECDSA) to the list of known hosts. 2023/06/21 10:02:01 fuzzer started 2023/06/21 10:02:02 dialing manager at localhost:36067 2023/06/21 10:02:02 checking machine... 2023/06/21 10:02:02 checking revisions... [ 37.468229] kmemleak: Automatic memory scanning thread ended 2023/06/21 10:02:02 testing simple program... [ 37.517364] cgroup: Unknown subsys name 'net' [ 37.604719] cgroup: Unknown subsys name 'rlimit' executing program executing program executing program VM DIAGNOSIS: 10:02:02 Registers: info registers vcpu 0 RAX=0000000000000000 RBX=0000000000000000 RCX=0000000000000100 RDX=ffffffff8542a6c0 RSI=ffffffff81143193 RDI=0000000000000007 RBP=000000000efb3670 RSP=ffff88806ce09d78 R8 =0000000000000007 R9 =0000000000000000 R10=0000000000000000 R11=0000000000000000 R12=0000000000000000 R13=0000000000080000 R14=ffffffff813782f8 R15=ffff88801a328c38 RIP=ffffffff814c0860 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 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=00007fdc8a237328 CR3=0000000005482000 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=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 info registers vcpu 1 RAX=0000000000000000 RBX=0000000000000001 RCX=ffffffff815342db RDX=ffff8880103e1b40 RSI=0000000000000008 RDI=ffffffff85d3d350 RBP=ffffffff8171b3d3 RSP=ffff88800c657e58 R8 =0000000000000000 R9 =fffffbfff0ba7a6a R10=ffffffff85d3d357 R11=000055c9fcd9a420 R12=0000000000000000 R13=000055c9fcd9a4a8 R14=0000000000000200 R15=0000000000000040 RIP=ffffffff8180fea8 RFL=00000056 [---ZAP-] 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 00007f8ccfceb900 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=000055c9fcd9a4a8 CR3=000000000e60e000 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=6f635f646873732f6873732f6374652f XMM01=666e6f632e2a2f642e6769666e6f635f XMM02=ffffffffffff00000000000000000000 XMM03=00000000000000000000000000000000 XMM04=00000000000000000000000000000000 XMM05=00000000000000000000000000000000 XMM06=00000000000000000000000000000000 XMM07=00000000000000000000000000000000 XMM08=00000000000073707574726174732064 XMM09=00000000000000000000000000000000 XMM10=00000000000000000000000000000000 XMM11=00000000000000000000000000000000 XMM12=00000000000000000000000000000000 XMM13=00000000000000000000000000000000 XMM14=00000000000000000000000000000000 XMM15=00000000000000000000000000000000