[ 23.879084] BUG: Bad rss-counter state mm:00000000fe27d691 type:MM_FILEPAGES val:33 [ 23.880067] BUG: Bad rss-counter state mm:00000000fe27d691 type:MM_ANONPAGES val:22 Debian GNU/Linux 11 syzkaller ttyS0 syzkaller login: [ 24.048814] ================================================================== [ 24.049886] BUG: KASAN: slab-use-after-free in vma_interval_tree_remove+0xc75/0xec0 [ 24.051161] Read of size 8 at addr ffff88800c7df310 by task sshd/219 [ 24.051918] [ 24.052132] CPU: 1 PID: 219 Comm: sshd Not tainted 6.4.0-rc7-next-20230620 #1 [ 24.052986] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014 [ 24.053962] Call Trace: [ 24.054299] [ 24.054581] dump_stack_lvl+0x91/0xf0 [ 24.055068] print_report+0xcc/0x620 [ 24.055544] ? __virt_addr_valid+0x102/0x340 [ 24.056088] ? vma_interval_tree_remove+0xc75/0xec0 [ 24.056702] ? vma_interval_tree_remove+0xc75/0xec0 [ 24.057318] kasan_report+0xbe/0xf0 [ 24.057791] ? vma_interval_tree_remove+0xc75/0xec0 [ 24.058440] vma_interval_tree_remove+0xc75/0xec0 [ 24.059063] vma_prepare+0xc54/0x11a0 [ 24.059563] __split_vma+0x5af/0x950 [ 24.060050] ? __pfx___split_vma+0x10/0x10 [ 24.060596] ? find_held_lock+0x2c/0x110 [ 24.061130] do_vmi_align_munmap+0x2ba/0x11f0 [ 24.061715] ? lock_is_held_type+0x9f/0x120 [ 24.062299] ? __pfx_do_vmi_align_munmap+0x10/0x10 [ 24.062920] ? mtree_range_walk+0x632/0x900 [ 24.063488] ? mas_walk+0x5c7/0x7c0 [ 24.063981] do_vmi_munmap+0x1f1/0x2b0 [ 24.064495] mmap_region+0x1f9/0x2660 [ 24.064989] ? vm_mmap_pgoff+0x15c/0x3a0 [ 24.065514] ? __pfx_arch_get_unmapped_area_topdown+0x10/0x10 [ 24.066252] ? __pfx_lock_acquire+0x10/0x10 [ 24.066801] ? __pfx_mmap_region+0x10/0x10 [ 24.067351] ? security_mmap_addr+0x7d/0xa0 [ 24.067899] ? get_unmapped_area+0x1f5/0x3f0 [ 24.068469] do_mmap+0x854/0xf00 [ 24.068923] vm_mmap_pgoff+0x1a6/0x3a0 [ 24.069437] ? __pfx_vm_mmap_pgoff+0x10/0x10 [ 24.070023] ksys_mmap_pgoff+0x3af/0x500 [ 24.070584] do_syscall_64+0x3f/0x90 [ 24.071079] entry_SYSCALL_64_after_hwframe+0x6e/0xd8 [ 24.071746] RIP: 0033:0x7efffa5b6d82 [ 24.072221] 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 [ 24.074429] RSP: 002b:00007ffe72704558 EFLAGS: 00000206 ORIG_RAX: 0000000000000009 [ 24.075363] RAX: ffffffffffffffda RBX: 0000000000000812 RCX: 00007efffa5b6d82 [ 24.076243] RDX: 0000000000000005 RSI: 0000000000001000 RDI: 00007efff99f0000 [ 24.077127] RBP: 00007efff99f0000 R08: 0000000000000009 R09: 0000000000001000 [ 24.078003] R10: 0000000000000812 R11: 0000000000000206 R12: 000055e42acc5f70 [ 24.078887] R13: 00007ffe72704570 R14: 00007ffe727045a0 R15: 00007ffe72704900 [ 24.079769] [ 24.080070] [ 24.080290] Allocated by task 212: [ 24.080737] kasan_save_stack+0x22/0x50 [ 24.081261] kasan_set_track+0x25/0x30 [ 24.081770] __kasan_slab_alloc+0x59/0x70 [ 24.082337] kmem_cache_alloc+0x16b/0x370 [ 24.082871] vm_area_dup+0x20/0x160 [ 24.083341] __split_vma+0x170/0x950 [ 24.083825] split_vma+0xc6/0x110 [ 24.084279] mprotect_fixup+0x8d2/0xb30 [ 24.084801] do_mprotect_pkey+0x87e/0xd40 [ 24.085335] __x64_sys_mprotect+0x78/0xc0 [ 24.085877] do_syscall_64+0x3f/0x90 [ 24.086375] entry_SYSCALL_64_after_hwframe+0x6e/0xd8 [ 24.087037] [ 24.087259] Freed by task 203: [ 24.087664] kasan_save_stack+0x22/0x50 [ 24.088178] kasan_set_track+0x25/0x30 [ 24.088686] kasan_save_free_info+0x2b/0x50 [ 24.089233] __kasan_slab_free+0x10a/0x190 [ 24.089781] kmem_cache_free+0x10d/0x4d0 [ 24.090315] rcu_core+0x8c8/0x2860 [ 24.090777] __do_softirq+0x1b7/0x7d4 [ 24.091267] [ 24.091493] Last potentially related work creation: [ 24.092097] kasan_save_stack+0x22/0x50 [ 24.092617] __kasan_record_aux_stack+0x8e/0xa0 [ 24.093208] __call_rcu_common.constprop.0+0x6a/0xb90 [ 24.093866] remove_vma+0x139/0x170 [ 24.094351] do_vmi_align_munmap+0xd4a/0x11f0 [ 24.094924] do_vmi_munmap+0x1f1/0x2b0 [ 24.095432] __vm_munmap+0x138/0x3a0 [ 24.095991] __x64_sys_munmap+0x59/0x80 [ 24.096502] do_syscall_64+0x3f/0x90 [ 24.096992] entry_SYSCALL_64_after_hwframe+0x6e/0xd8 [ 24.097657] [ 24.097877] The buggy address belongs to the object at ffff88800c7df2b8 [ 24.097877] which belongs to the cache vm_area_struct of size 168 [ 24.099417] The buggy address is located 88 bytes inside of [ 24.099417] freed 168-byte region [ffff88800c7df2b8, ffff88800c7df360) [ 24.100880] [ 24.101101] The buggy address belongs to the physical page: [ 24.101807] page:0000000082d25fa4 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0xc7df [ 24.102953] memcg:ffff888019f91001 [ 24.103436] flags: 0x100000000000200(slab|node=0|zone=1) [ 24.104104] page_type: 0xffffffff() [ 24.104572] raw: 0100000000000200 ffff8880087a0c80 dead000000000122 0000000000000000 [ 24.105528] raw: 0000000000000000 0000000000110011 00000001ffffffff ffff888019f91001 [ 24.106481] page dumped because: kasan: bad access detected [ 24.107164] [ 24.107386] Memory state around the buggy address: [ 24.107992] ffff88800c7df200: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 fc [ 24.108884] ffff88800c7df280: fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb fb [ 24.109773] >ffff88800c7df300: fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc [ 24.110663] ^ [ 24.111149] ffff88800c7df380: fc fc fc fc fa fb fb fb fb fb fb fb fb fb fb fb [ 24.112034] ffff88800c7df400: fb fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc [ 24.112913] ================================================================== [ 24.113889] Disabling lock debugging due to kernel taint [ 26.635449] BUG: Bad rss-counter state mm:000000006577e704 type:MM_FILEPAGES val:31 [ 26.636556] BUG: Bad rss-counter state mm:000000006577e704 type:MM_ANONPAGES val:22 [ 27.042105] BUG: Bad rss-counter state mm:00000000e8983464 type:MM_FILEPAGES val:33 [ 27.043178] BUG: Bad rss-counter state mm:00000000e8983464 type:MM_ANONPAGES val:22 Warning: Permanently added '[localhost]:25045' (ECDSA) to the list of known hosts. 2023/06/21 03:50:24 fuzzer started 2023/06/21 03:50:24 dialing manager at localhost:36067 2023/06/21 03:50:24 checking machine... 2023/06/21 03:50:24 checking revisions... [ 27.729588] kmemleak: Automatic memory scanning thread ended 2023/06/21 03:50:24 testing simple program... [ 27.781076] cgroup: Unknown subsys name 'net' [ 27.832486] cgroup: Unknown subsys name 'rlimit' executing program executing program executing program VM DIAGNOSIS: 03:50:23 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=00007ffea1e95ff8 CR3=00000000094f2000 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=2033323a30353a3330203132206e754a XMM01=73732878696e755f6d6170203a5d3832 XMM02=65736f6c63206e6f6973736573203a29 XMM03=755f6d6170203a5d3832325b64687373 XMM04=69662068637573206f4e203a656c6163 XMM05=3a656c696620766e65206e65706f206f XMM06=65733a6468737328766e655f6d617020 XMM07=6b7a79732033323a30353a3330203132 XMM08=3d656e696c646d632022656369767265 XMM09=00000000000000000000000000000000 XMM10=00000000000000000000000000000000 XMM11=00000000000000000000000000000000 XMM12=00000000000000000000000000000000 XMM13=00000000000000000000000000000000 XMM14=00000000000000000000000000000000 XMM15=00000000000000000000000000000000 info registers vcpu 1 RAX=1ffffffff0ff2f06 RBX=ffffffff87f97640 RCX=0000000000000000 RDX=ffff88800fc7d1c0 RSI=ffffffff83c60a6a RDI=ffffffff87f97830 RBP=0000000000000000 RSP=ffff8880184bf6a8 R8 =0000000000000005 R9 =00000000000000ff R10=000000000000004f R11=0000084f0000084f R12=0000000000000000 R13=000000000000004f R14=dffffc0000000000 R15=0000000000000001 RIP=ffffffff83c60a7d 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 00007fd630c04900 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=00007fd6311bb618 CR3=0000000016dc8000 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=6e69676f6c5f6d61702c78756e696c65 XMM02=755f6d61702c74696d7265705f6d6170 XMM03=2c766e655f6d61702c7374696d696c5f XMM04=6d61702c766e655f6d61702c7374696d XMM05=78696e755f6d61702c74696d7265705f XMM06=6469756e69676f6c5f6d61702c78756e XMM07=672065736f6c635f6e6f69737365733a XMM08=61662029286e65706f5f746964756100 XMM09=00000000000000000000000000000000 XMM10=00000000000000000000000000000000 XMM11=00000000000000000000000000000000 XMM12=00000000000000000000000000000000 XMM13=00000000000000000000000000000000 XMM14=00000000000000000000000000000000 XMM15=00000000000000000000000000000000