Debian GNU/Linux 11 syzkaller ttyS0 syzkaller login: [ 41.378760] BUG: Bad rss-counter state mm:00000000819b62cd type:MM_FILEPAGES val:33 [ 41.380054] BUG: Bad rss-counter state mm:00000000819b62cd type:MM_ANONPAGES val:22 [ 41.537775] ================================================================== [ 41.538777] BUG: KASAN: slab-use-after-free in vma_interval_tree_remove+0xc75/0xec0 [ 41.539786] Read of size 8 at addr ffff88801671b968 by task sshd/220 [ 41.540690] [ 41.540932] CPU: 0 PID: 220 Comm: sshd Not tainted 6.4.0-rc7-next-20230619 #1 [ 41.541849] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014 [ 41.542920] Call Trace: [ 41.543258] [ 41.543560] dump_stack_lvl+0x91/0xf0 [ 41.544152] print_report+0xcc/0x620 [ 41.544657] ? __virt_addr_valid+0x102/0x340 [ 41.545232] ? vma_interval_tree_remove+0xc75/0xec0 [ 41.545894] ? vma_interval_tree_remove+0xc75/0xec0 [ 41.546549] kasan_report+0xbe/0xf0 [ 41.547049] ? vma_interval_tree_remove+0xc75/0xec0 [ 41.547711] vma_interval_tree_remove+0xc75/0xec0 [ 41.548344] vma_prepare+0xc54/0x11a0 [ 41.548858] __split_vma+0x5af/0x950 [ 41.549349] ? __pfx___split_vma+0x10/0x10 [ 41.549902] ? find_held_lock+0x2c/0x110 [ 41.550447] do_vmi_align_munmap+0x2ba/0x11f0 [ 41.551051] ? lock_is_held_type+0x9f/0x120 [ 41.551626] ? __pfx_do_vmi_align_munmap+0x10/0x10 [ 41.552277] ? mtree_range_walk+0x632/0x900 [ 41.552854] ? mas_walk+0x5c7/0x7c0 [ 41.553351] do_vmi_munmap+0x1f1/0x2b0 [ 41.553865] mmap_region+0x1f9/0x2660 [ 41.554366] ? vm_mmap_pgoff+0x15c/0x3a0 [ 41.554905] ? __pfx_arch_get_unmapped_area_topdown+0x10/0x10 [ 41.555661] ? __pfx_lock_acquire+0x10/0x10 [ 41.556248] ? __pfx_mmap_region+0x10/0x10 [ 41.556807] ? security_mmap_addr+0x7d/0xa0 [ 41.557371] ? get_unmapped_area+0x1f5/0x3f0 [ 41.557947] do_mmap+0x854/0xf00 [ 41.558410] vm_mmap_pgoff+0x1a6/0x3a0 [ 41.558937] ? __pfx_vm_mmap_pgoff+0x10/0x10 [ 41.559528] ksys_mmap_pgoff+0x3af/0x500 [ 41.560074] do_syscall_64+0x3f/0x90 [ 41.560573] entry_SYSCALL_64_after_hwframe+0x6e/0xd8 [ 41.561265] RIP: 0033:0x7f0c1a0e3d82 [ 41.561754] 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 [ 41.564033] RSP: 002b:00007ffc565a1a58 EFLAGS: 00000206 ORIG_RAX: 0000000000000009 [ 41.564992] RAX: ffffffffffffffda RBX: 0000000000000812 RCX: 00007f0c1a0e3d82 [ 41.565911] RDX: 0000000000000005 RSI: 0000000000001000 RDI: 00007f0c1951d000 [ 41.566825] RBP: 00007f0c1951d000 R08: 0000000000000009 R09: 0000000000001000 [ 41.567758] R10: 0000000000000812 R11: 0000000000000206 R12: 0000563652316ec0 [ 41.568661] R13: 00007ffc565a1a70 R14: 00007ffc565a1aa0 R15: 00007ffc565a1e00 [ 41.569575] [ 41.569881] [ 41.570112] Allocated by task 213: [ 41.570570] kasan_save_stack+0x22/0x50 [ 41.571100] kasan_set_track+0x25/0x30 [ 41.571620] __kasan_slab_alloc+0x59/0x70 [ 41.572179] kmem_cache_alloc+0x16b/0x370 [ 41.572727] vm_area_dup+0x20/0x160 [ 41.573206] __split_vma+0x170/0x950 [ 41.573700] split_vma+0xc6/0x110 [ 41.574154] mprotect_fixup+0x8d2/0xb30 [ 41.574680] do_mprotect_pkey+0x87e/0xd40 [ 41.575229] __x64_sys_mprotect+0x78/0xc0 [ 41.575802] do_syscall_64+0x3f/0x90 [ 41.576298] entry_SYSCALL_64_after_hwframe+0x6e/0xd8 [ 41.576979] [ 41.577204] Freed by task 203: [ 41.577618] kasan_save_stack+0x22/0x50 [ 41.578150] kasan_set_track+0x25/0x30 [ 41.578678] kasan_save_free_info+0x2b/0x50 [ 41.579245] __kasan_slab_free+0x10a/0x190 [ 41.579818] kmem_cache_free+0x10d/0x4d0 [ 41.580352] rcu_core+0x8c8/0x2860 [ 41.580819] __do_softirq+0x1b7/0x7d4 [ 41.581321] [ 41.581541] Last potentially related work creation: [ 41.582152] kasan_save_stack+0x22/0x50 [ 41.582690] __kasan_record_aux_stack+0x8e/0xa0 [ 41.583294] __call_rcu_common.constprop.0+0x6a/0xb90 [ 41.583990] remove_vma+0x139/0x170 [ 41.584470] do_vmi_align_munmap+0xd4a/0x11f0 [ 41.585064] do_vmi_munmap+0x1f1/0x2b0 [ 41.585576] __vm_munmap+0x138/0x3a0 [ 41.586066] __x64_sys_munmap+0x59/0x80 [ 41.586585] do_syscall_64+0x3f/0x90 [ 41.587087] entry_SYSCALL_64_after_hwframe+0x6e/0xd8 [ 41.587789] [ 41.588015] Second to last potentially related work creation: [ 41.588739] kasan_save_stack+0x22/0x50 [ 41.589274] __kasan_record_aux_stack+0x8e/0xa0 [ 41.589881] __call_rcu_common.constprop.0+0x6a/0xb90 [ 41.590556] remove_vma+0x139/0x170 [ 41.591035] do_vmi_align_munmap+0xd4a/0x11f0 [ 41.591629] do_vmi_munmap+0x1f1/0x2b0 [ 41.592152] mmap_region+0x1f9/0x2660 [ 41.592652] do_mmap+0x854/0xf00 [ 41.593101] vm_mmap_pgoff+0x1a6/0x3a0 [ 41.593626] ksys_mmap_pgoff+0x3af/0x500 [ 41.594155] do_syscall_64+0x3f/0x90 [ 41.594652] entry_SYSCALL_64_after_hwframe+0x6e/0xd8 [ 41.595326] [ 41.595553] The buggy address belongs to the object at ffff88801671b910 [ 41.595553] which belongs to the cache vm_area_struct of size 168 [ 41.597141] The buggy address is located 88 bytes inside of [ 41.597141] freed 168-byte region [ffff88801671b910, ffff88801671b9b8) [ 41.598658] [ 41.598884] The buggy address belongs to the physical page: [ 41.599587] page:00000000ace0baa7 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1671b [ 41.600778] memcg:ffff888016937201 [ 41.601219] flags: 0x100000000000200(slab|node=0|zone=1) [ 41.601893] page_type: 0xffffffff() [ 41.602373] raw: 0100000000000200 ffff88800879fc80 dead000000000100 dead000000000122 [ 41.603352] raw: 0000000000000000 0000000000110011 00000001ffffffff ffff888016937201 [ 41.604327] page dumped because: kasan: bad access detected [ 41.605046] [ 41.605275] Memory state around the buggy address: [ 41.605905] ffff88801671b800: fc fc fc fc fc fa fb fb fb fb fb fb fb fb fb fb [ 41.606834] ffff88801671b880: fb fb fb fb fb fb fb fb fb fb fc fc fc fc fc fc [ 41.607772] >ffff88801671b900: fc fc fa fb fb fb fb fb fb fb fb fb fb fb fb fb [ 41.608715] ^ [ 41.609582] ffff88801671b980: fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc fa [ 41.610553] ffff88801671ba00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 41.611469] ================================================================== [ 41.612470] Disabling lock debugging due to kernel taint [ 43.666700] BUG: Bad rss-counter state mm:000000003439c32c type:MM_FILEPAGES val:33 [ 43.667924] BUG: Bad rss-counter state mm:000000003439c32c type:MM_ANONPAGES val:22 [ 44.173661] BUG: Bad rss-counter state mm:000000006ba6cd7f type:MM_FILEPAGES val:33 [ 44.174839] BUG: Bad rss-counter state mm:000000006ba6cd7f type:MM_ANONPAGES val:22 Warning: Permanently added '[localhost]:45007' (ECDSA) to the list of known hosts. 2023/06/20 01:06:34 fuzzer started 2023/06/20 01:06:34 dialing manager at localhost:44161 2023/06/20 01:06:34 checking machine... 2023/06/20 01:06:34 checking revisions... [ 44.861070] kmemleak: Automatic memory scanning thread ended 2023/06/20 01:06:35 testing simple program... [ 44.908330] cgroup: Unknown subsys name 'net' [ 44.953293] cgroup: Unknown subsys name 'rlimit' executing program executing program executing program VM DIAGNOSIS: 01:06:23 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=00007f6804d5d7b0 CR3=000000000c76a000 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=cd32123ff05e05819140cdc7351ddf52 XMM02=2c67c8bc2e329bc3000000000011cd30 XMM03=fb795ef6d657705600000000001242c8 XMM04=9b1d135cc01fe7a700000000000ae988 XMM05=83b7d73f7a1ab90c0000000000135618 XMM06=4fda316b135da52b0000000000135010 XMM07=e042d86d42eb936e0000000000124548 XMM08=b8d034421100f5f7000000000011cd90 XMM09=00000000000000000000000000000000 XMM10=20200000000020202020202020200000 XMM11=00000000000000000000000000000000 XMM12=00000000000000000000000000000000 XMM13=00000000000000000000000000000000 XMM14=00000000000000000000000000000000 XMM15=00000000000000000000000000000000 info registers vcpu 1 RAX=ffff88806cf35000 RBX=0000000000000001 RCX=ffffffff8450c50e RDX=ffffed100d9e6a01 RSI=0000000000000004 RDI=ffffffff812889a5 RBP=dffffc0000000000 RSP=ffff888008e27e70 R8 =0000000000000000 R9 =ffffed100d9e6a00 R10=ffff88806cf35003 R11=ffff888008c58400 R12=ffffffff85d3bed0 R13=1ffff110011c4fd3 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 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=00007f8ea4a70618 CR3=000000000d80e000 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=2034333a36303a3130203032206e754a XMM01=73732878696e755f6d6170203a5d3932 XMM02=65736f6c63206e6f6973736573203a29 XMM03=755f6d6170203a5d3932325b64687373 XMM04=69662068637573206f4e203a656c6163 XMM05=3a656c696620766e65206e65706f206f XMM06=65733a6468737328766e655f6d617020 XMM07=6b7a79732034333a36303a3130203032 XMM08=3d656e696c646d632022656369767265 XMM09=00000000000000000000000000000000 XMM10=00000000000000000000000000000000 XMM11=00000000000000000000000000000000 XMM12=00000000000000000000000000000000 XMM13=00000000000000000000000000000000 XMM14=00000000000000000000000000000000 XMM15=00000000000000000000000000000000