[ 24.829049] BUG: Bad rss-counter state mm:000000007e29fab0 type:MM_FILEPAGES val:33 [ 24.830593] BUG: Bad rss-counter state mm:000000007e29fab0 type:MM_ANONPAGES val:22 [ 24.995011] ================================================================== [ 24.995943] BUG: KASAN: slab-use-after-free in vma_interval_tree_remove+0xc75/0xec0 [ 24.996869] Read of size 8 at addr ffff88800c8364e0 by task sshd/219 [ 24.997652] [ 24.997868] CPU: 1 PID: 219 Comm: sshd Not tainted 6.4.0-rc7-next-20230619 #1 [ 24.998884] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014 [ 24.999855] Call Trace: [ 25.000170] [ 25.000455] dump_stack_lvl+0x91/0xf0 [ 25.000977] print_report+0xcc/0x620 [ 25.001459] ? __virt_addr_valid+0x102/0x340 [ 25.002015] ? vma_interval_tree_remove+0xc75/0xec0 [ 25.002631] ? vma_interval_tree_remove+0xc75/0xec0 [ 25.003242] kasan_report+0xbe/0xf0 [ 25.003724] ? vma_interval_tree_remove+0xc75/0xec0 [ 25.004337] vma_interval_tree_remove+0xc75/0xec0 [ 25.004946] vma_prepare+0xc54/0x11a0 [ 25.005424] __split_vma+0x5af/0x950 [ 25.005889] ? __pfx___split_vma+0x10/0x10 [ 25.006418] ? find_held_lock+0x2c/0x110 [ 25.006937] do_vmi_align_munmap+0x2ba/0x11f0 [ 25.007496] ? lock_is_held_type+0x9f/0x120 [ 25.008036] ? __pfx_do_vmi_align_munmap+0x10/0x10 [ 25.008642] ? mtree_range_walk+0x632/0x900 [ 25.009208] ? mas_walk+0x5c7/0x7c0 [ 25.009703] do_vmi_munmap+0x1f1/0x2b0 [ 25.010220] mmap_region+0x1f9/0x2660 [ 25.010730] ? vm_mmap_pgoff+0x15c/0x3a0 [ 25.011265] ? __pfx_arch_get_unmapped_area_topdown+0x10/0x10 [ 25.012010] ? __pfx_lock_acquire+0x10/0x10 [ 25.012575] ? __pfx_mmap_region+0x10/0x10 [ 25.013158] ? security_mmap_addr+0x7d/0xa0 [ 25.013720] ? get_unmapped_area+0x1f5/0x3f0 [ 25.014299] do_mmap+0x854/0xf00 [ 25.014752] vm_mmap_pgoff+0x1a6/0x3a0 [ 25.015267] ? __pfx_vm_mmap_pgoff+0x10/0x10 [ 25.015857] ksys_mmap_pgoff+0x3af/0x500 [ 25.016395] do_syscall_64+0x3f/0x90 [ 25.016909] entry_SYSCALL_64_after_hwframe+0x6e/0xd8 [ 25.017588] RIP: 0033:0x7f01e11b1d82 [ 25.018066] 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 Debian GNU/Li[ 25.020308] RSP: 002b:00007ffc5f37b6c8 EFLAGS: 00000206 ORIG_RAX: 0000000000000009 [ 25.021606] RAX: ffffffffffffffda RBX: 0000000000000812 RCX: 00007f01e11b1d82 [ 25.022511] RDX: 0000000000000005 RSI: 0000000000001000 RDI: 00007f01e05eb000 [ 25.023410] RBP: 00007f01e05eb000 R08: 0000000000000009 R09: 0000000000001000 [ 25.024301] R10: 0000000000000812 R11: 0000000000000206 R12: 000055b1cab89f70 [ 25.025220] R13: 00007ffc5f37b6e0 R14: 00007ffc5f37b710 R15: 00007ffc5f37ba70 [ 25.026131] [ 25.026445] [ 25.026673] Allocated by task 212: [ 25.027133] kasan_save_stack+0x22/0x50 [ 25.027674] kasan_set_track+0x25/0x30 [ 25.028199] __kasan_slab_alloc+0x59/0x70 [ 25.028757] kmem_cache_alloc+0x16b/0x370 [ 25.029322] vm_area_dup+0x20/0x160 [ 25.029801] __split_vma+0x170/0x950 [ 25.030292] split_vma+0xc6/0x110 [ 25.030764] mprotect_fixup+0x8d2/0xb30 [ 25.031295] do_mprotect_pkey+0x87e/0xd40 [ 25.031845] __x64_sys_mprotect+0x78/0xc0 [ 25.032401] do_syscall_64+0x3f/0x90 [ 25.032899] entry_SYSCALL_64_after_hwframe+0x6e/0xd8 [ 25.033574] [ 25.033798] Freed by task 19: [ 25.034204] kasan_save_stack+0x22/0x50 [ 25.034733] kasan_set_track+0x25/0x30 [ 25.035249] kasan_save_free_info+0x2b/0x50 [ 25.035802] __kasan_slab_free+0x10a/0x190 [ 25.036358] kmem_cache_free+0x10d/0x4d0 [ 25.036913] rcu_core+0x8c8/0x2860 [ 25.037385] __do_softirq+0x1b7/0x7d4 [ 25.037883] [ 25.038105] Last potentially related work creation: [ 25.038722] kasan_save_stack+0x22/0x50 [ 25.039242] __kasan_record_aux_stack+0x8e/0xa0 [ 25.039908] __call_rcu_common.constprop.0+0x6a/0xb90 [ 25.040582] remove_vma+0x139/0x170 [ 25.041076] do_vmi_align_munmap+0xd4a/0x11f0 [ 25.041662] do_vmi_munmap+0x1f1/0x2b0 [ 25.042182] __vm_munmap+0x138/0x3a0 [ 25.042668] __x64_sys_munmap+0x59/0x80 [ 25.043189] do_syscall_64+0x3f/0x90 [ 25.043680] entry_SYSCALL_64_after_hwframe+0x6e/0xd8 [ 25.044374] [ 25.044600] The buggy address belongs to the object at ffff88800c836488 [ 25.044600] which belongs to the cache vm_area_struct of size 168 [ 25.046153] The buggy address is located 88 bytes inside of [ 25.046153] freed 168-byte region [ffff88800c836488, ffff88800c836530) [ 25.047643] [ 25.047869] The buggy address belongs to the physical page: [ 25.048568] page:00000000ff07c817 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0xc836 [ 25.049723] memcg:ffff88800ef77301 [ 25.050177] flags: 0x100000000000200(slab|node=0|zone=1) [ 25.050858] page_type: 0xffffffff() [ 25.051324] raw: 0100000000000200 ffff88800879fc80 ffffea0000314600 dead000000000008 [ 25.052284] raw: 0000000000000000 0000000000110011 00000001ffffffff ffff88800ef77301 [ 25.053250] page dumped because: kasan: bad access detected [ 25.053951] [ 25.054183] Memory state around the buggy address: [ 25.054806] ffff88800c836380: fc fc fc fc fa fb fb fb fb fb fb fb fb fb fb fb [ 25.055721] ffff88800c836400: fb fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc [ 25.056656] >ffff88800c836480: fc fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 25.057568] ^ [ 25.058374] ffff88800c836500: fb fb fb fb fb fb fc fc fc fc fc fc fc fc 00 00 [ 25.059277] ffff88800c836580: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 25.060178] ================================================================== nux 11 syzkaller ttyS0 syzkaller login: [ 25.062008] Disabling lock debugging due to kernel taint [ 27.168524] BUG: Bad rss-counter state mm:000000006be079f7 type:MM_FILEPAGES val:33 [ 27.169615] BUG: Bad rss-counter state mm:000000006be079f7 type:MM_ANONPAGES val:22 [ 27.687152] BUG: Bad rss-counter state mm:000000007dd8253c type:MM_FILEPAGES val:33 [ 27.688432] BUG: Bad rss-counter state mm:000000007dd8253c type:MM_ANONPAGES val:22 Warning: Permanently added '[localhost]:29461' (ECDSA) to the list of known hosts. 2023/06/19 14:21:49 fuzzer started 2023/06/19 14:21:49 dialing manager at localhost:44161 2023/06/19 14:21:49 checking machine... 2023/06/19 14:21:49 checking revisions... [ 28.419979] kmemleak: Automatic memory scanning thread ended 2023/06/19 14:21:49 testing simple program... [ 28.462522] cgroup: Unknown subsys name 'net' [ 28.508326] cgroup: Unknown subsys name 'rlimit' executing program executing program executing program VM DIAGNOSIS: 14:21:47 Registers: info registers vcpu 0 RAX=ffff88806ce35000 RBX=0000000000000000 RCX=ffffffff8450c50e RDX=ffffed100d9c6a01 RSI=0000000000000004 RDI=ffffffff812889a5 RBP=dffffc0000000000 RSP=ffffffff85407e10 R8 =0000000000000000 R9 =ffffed100d9c6a00 R10=ffff88806ce35003 R11=ffff888008c58000 R12=ffffffff85d3bed0 R13=1ffffffff0a80fc7 R14=0000000000000000 R15=0000000000000000 RIP=ffffffff8450d49f 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=00007f29e092b530 CR3=000000000cafe000 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=2038343a31323a3431203931206e754a XMM01=657463656e6e6f63736944203a5d3832 XMM02=302e303120746f6f722072657375206d XMM03=203a5d3832325b646873732072656c6c XMM04=69662068637573206f4e203a656c6163 XMM05=3a656c696620766e65206e65706f206f XMM06=65733a6468737328766e655f6d617020 XMM07=6b7a79732038343a31323a3431203931 XMM08=3d656e696c646d632022656369767265 XMM09=00000000000000000000000000000000 XMM10=00000000000000000000000000000000 XMM11=00000000000000000000000000000000 XMM12=00000000000000000000000000000000 XMM13=00000000000000000000000000000000 XMM14=00000000000000000000000000000000 XMM15=00000000000000000000000000000000 info registers vcpu 1 RAX=ffffffff860d1681 RBX=0000000000000002 RCX=ffffffff860d167c RDX=0000000000000000 RSI=1ffffffff0c1a2d0 RDI=ffffffff85db8aec RBP=ffff88806cf09a70 RSP=ffff88806cf099a8 R8 =ffffffff860d1670 R9 =ffff88806cf09a58 R10=0000000000038001 R11=000000000000fdc6 R12=ffff88806cf09a78 R13=ffff88806cf09a60 R14=ffff88806cf09a59 R15=ffff88806cf09a18 RIP=ffffffff81130a5b RFL=00000212 [----A--] 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 00007f343b373700 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=00007f785fcd7618 CR3=000000000cafe000 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=6d6f72662064657463656e6e6f637369 XMM02=2e303120746f6f722072657375206d6f XMM03=3a5d3832325b646873732038343a3132 XMM04=6456774875434142334f726f59427469 XMM05=485320415352203a3268737320383934 XMM06=206d6f726620746f6f7220726f662079 XMM07=00000000000000000000000000000000 XMM08=3a677562656420676f6c737973720000 XMM09=00000000000000000000000000000000 XMM10=00000000000000000000000000000000 XMM11=00000000000000000000000000000000 XMM12=00000000000000000000000000000000 XMM13=00000000000000000000000000000000 XMM14=00000000000000000000000000000000 XMM15=00000000000000000000000000000000