Debian GNU/Linux 11 syzkaller ttyS0 syzkaller login: [ 23.699023] BUG: Bad rss-counter state mm:00000000c7adc0d3 type:MM_FILEPAGES val:33 [ 23.700957] BUG: Bad rss-counter state mm:00000000c7adc0d3 type:MM_ANONPAGES val:22 [ 23.859677] ================================================================== [ 23.860546] BUG: KASAN: slab-use-after-free in vma_interval_tree_remove+0xc75/0xec0 [ 23.861461] Read of size 8 at addr ffff88800cab0a50 by task sshd/218 [ 23.862204] [ 23.862417] CPU: 1 PID: 218 Comm: sshd Not tainted 6.4.0-rc7-next-20230620 #1 [ 23.863421] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014 [ 23.864381] Call Trace: [ 23.864689] [ 23.864966] dump_stack_lvl+0x91/0xf0 [ 23.865444] print_report+0xcc/0x620 [ 23.865913] ? __virt_addr_valid+0x102/0x340 [ 23.866446] ? vma_interval_tree_remove+0xc75/0xec0 [ 23.867041] ? vma_interval_tree_remove+0xc75/0xec0 [ 23.867643] kasan_report+0xbe/0xf0 [ 23.868109] ? vma_interval_tree_remove+0xc75/0xec0 [ 23.868708] vma_interval_tree_remove+0xc75/0xec0 [ 23.869291] vma_prepare+0xc54/0x11a0 [ 23.869757] __split_vma+0x5af/0x950 [ 23.870214] ? __pfx___split_vma+0x10/0x10 [ 23.870728] ? find_held_lock+0x2c/0x110 [ 23.871232] do_vmi_align_munmap+0x2ba/0x11f0 [ 23.871792] ? lock_is_held_type+0x9f/0x120 [ 23.872319] ? __pfx_do_vmi_align_munmap+0x10/0x10 [ 23.872923] ? mtree_range_walk+0x632/0x900 [ 23.873469] ? mas_walk+0x5c7/0x7c0 [ 23.873941] do_vmi_munmap+0x1f1/0x2b0 [ 23.874426] mmap_region+0x1f9/0x2660 [ 23.874903] ? vm_mmap_pgoff+0x15c/0x3a0 [ 23.875408] ? __pfx_arch_get_unmapped_area_topdown+0x10/0x10 [ 23.876122] ? __pfx_lock_acquire+0x10/0x10 [ 23.876650] ? __pfx_mmap_region+0x10/0x10 [ 23.877172] ? security_mmap_addr+0x7d/0xa0 [ 23.877702] ? get_unmapped_area+0x1f5/0x3f0 [ 23.878248] do_mmap+0x854/0xf00 [ 23.878687] vm_mmap_pgoff+0x1a6/0x3a0 [ 23.879180] ? __pfx_vm_mmap_pgoff+0x10/0x10 [ 23.879748] ksys_mmap_pgoff+0x3af/0x500 [ 23.880244] do_syscall_64+0x3f/0x90 [ 23.880713] entry_SYSCALL_64_after_hwframe+0x6e/0xd8 [ 23.881353] RIP: 0033:0x7f1b8eaabd82 [ 23.881803] 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 [ 23.883902] RSP: 002b:00007ffd03dff858 EFLAGS: 00000206 ORIG_RAX: 0000000000000009 [ 23.884799] RAX: ffffffffffffffda RBX: 0000000000000812 RCX: 00007f1b8eaabd82 [ 23.885637] RDX: 0000000000000005 RSI: 0000000000001000 RDI: 00007f1b8dee5000 [ 23.886475] RBP: 00007f1b8dee5000 R08: 0000000000000009 R09: 0000000000001000 [ 23.887307] R10: 0000000000000812 R11: 0000000000000206 R12: 000055edb7444ec0 [ 23.888152] R13: 00007ffd03dff870 R14: 00007ffd03dff8a0 R15: 00007ffd03dffc00 [ 23.889003] [ 23.889294] [ 23.889511] Allocated by task 211: [ 23.889937] kasan_save_stack+0x22/0x50 [ 23.890432] kasan_set_track+0x25/0x30 [ 23.890921] __kasan_slab_alloc+0x59/0x70 [ 23.891435] kmem_cache_alloc+0x16b/0x370 [ 23.891965] vm_area_dup+0x20/0x160 [ 23.892416] __split_vma+0x170/0x950 [ 23.892875] split_vma+0xc6/0x110 [ 23.893311] mprotect_fixup+0x8d2/0xb30 [ 23.893806] do_mprotect_pkey+0x87e/0xd40 [ 23.894326] __x64_sys_mprotect+0x78/0xc0 [ 23.894844] do_syscall_64+0x3f/0x90 [ 23.895312] entry_SYSCALL_64_after_hwframe+0x6e/0xd8 [ 23.895963] [ 23.896180] Freed by task 211: [ 23.896567] kasan_save_stack+0x22/0x50 [ 23.897062] kasan_set_track+0x25/0x30 [ 23.897554] kasan_save_free_info+0x2b/0x50 [ 23.898085] __kasan_slab_free+0x10a/0x190 [ 23.898613] kmem_cache_free+0x10d/0x4d0 [ 23.899117] rcu_core+0x8c8/0x2860 [ 23.899564] __do_softirq+0x1b7/0x7d4 [ 23.900039] [ 23.900253] Last potentially related work creation: [ 23.900836] kasan_save_stack+0x22/0x50 [ 23.901335] __kasan_record_aux_stack+0x8e/0xa0 [ 23.901904] __call_rcu_common.constprop.0+0x6a/0xb90 [ 23.902535] remove_vma+0x139/0x170 [ 23.902980] do_vmi_align_munmap+0xd4a/0x11f0 [ 23.903547] do_vmi_munmap+0x1f1/0x2b0 [ 23.904034] __vm_munmap+0x138/0x3a0 [ 23.904494] __x64_sys_munmap+0x59/0x80 [ 23.904984] do_syscall_64+0x3f/0x90 [ 23.905455] entry_SYSCALL_64_after_hwframe+0x6e/0xd8 [ 23.906092] [ 23.906306] The buggy address belongs to the object at ffff88800cab09f8 [ 23.906306] which belongs to the cache vm_area_struct of size 168 [ 23.907749] The buggy address is located 88 bytes inside of [ 23.907749] freed 168-byte region [ffff88800cab09f8, ffff88800cab0aa0) [ 23.909127] [ 23.909344] The buggy address belongs to the physical page: [ 23.909997] page:00000000860c8539 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0xcab0 [ 23.911061] memcg:ffff88800c549401 [ 23.911479] flags: 0x100000000000200(slab|node=0|zone=1) [ 23.912122] page_type: 0xffffffff() [ 23.912567] raw: 0100000000000200 ffff8880087a0c80 dead000000000100 dead000000000122 [ 23.913460] raw: 0000000000000000 0000000000110011 00000001ffffffff ffff88800c549401 [ 23.914346] page dumped because: kasan: bad access detected [ 23.914999] [ 23.915213] Memory state around the buggy address: [ 23.915798] ffff88800cab0900: fc fc 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 23.916642] ffff88800cab0980: 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc fa [ 23.917485] >ffff88800cab0a00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 23.918325] ^ [ 23.919020] ffff88800cab0a80: fb fb fb fb fc fc fc fc fc fc fc fc fa fb fb fb [ 23.919871] ffff88800cab0b00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 23.920702] ================================================================== [ 23.921910] Disabling lock debugging due to kernel taint [ 25.902035] BUG: Bad rss-counter state mm:000000001629594b type:MM_FILEPAGES val:33 [ 25.903092] BUG: Bad rss-counter state mm:000000001629594b type:MM_ANONPAGES val:22 [ 26.346984] BUG: Bad rss-counter state mm:0000000007f1374b type:MM_FILEPAGES val:33 [ 26.348366] BUG: Bad rss-counter state mm:0000000007f1374b type:MM_ANONPAGES val:22 Warning: Permanently added '[localhost]:17642' (ECDSA) to the list of known hosts. 2023/06/21 07:48:34 fuzzer started 2023/06/21 07:48:35 dialing manager at localhost:36067 2023/06/21 07:48:35 checking machine... 2023/06/21 07:48:35 checking revisions... [ 27.049949] kmemleak: Automatic memory scanning thread ended 2023/06/21 07:48:35 testing simple program... [ 27.094007] cgroup: Unknown subsys name 'net' [ 27.173519] cgroup: Unknown subsys name 'rlimit' executing program executing program executing program VM DIAGNOSIS: 07:48:34 Registers: info registers vcpu 0 RAX=ffffffff818d4f0d RBX=ffffffff813ad470 RCX=0000000000000001 RDX=1ffff11001f9ff1a RSI=ffffffff818d4f0d RDI=ffff88800fcff940 RBP=ffff88800fcff910 RSP=ffff88800fcff870 R8 =0000000000000001 R9 =ffff88800fcff8b8 R10=0000000000038001 R11=00000000000240a4 R12=ffff88800fcff940 R13=0000000000000000 R14=ffff888015dad1c0 R15=0000000000092cc0 RIP=ffffffff813ad474 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 00007fc89065e900 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=00007fc890c13650 CR3=000000000fbfc000 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=000000000000000000000000000000ff XMM02=000000000000000000000000000000ff XMM03=5320444f4854454d5f54505952434e45 XMM04=40404040404040404040404040404040 XMM05=5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a XMM06=20202020202020202020202020202020 XMM07=00000000000000000000000000000000 XMM08=ffbc64ffffbc44ffffbc34ffffbc9f00 XMM09=00000000000000000000000000000000 XMM10=00000000000000000000000000000000 XMM11=00000000000000000000000000000000 XMM12=00000000000000000000000000000000 XMM13=00000000000000000000000000000000 XMM14=00000000000000000000000000000000 XMM15=00000000000000000000000000000000 info registers vcpu 1 RAX=ffff88806cf35000 RBX=0000000000000001 RCX=ffffffff8451250e RDX=ffffed100d9e6a01 RSI=0000000000000004 RDI=ffffffff81288ac5 RBP=dffffc0000000000 RSP=ffff888008e07e70 R8 =0000000000000000 R9 =ffffed100d9e6a00 R10=ffff88806cf35003 R11=0000000000000001 R12=ffffffff85d3d350 R13=1ffff110011c0fd3 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 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=000055cf8e174000 CR3=0000000005482000 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=00007fbf45a47510000055cf8e170790 XMM02=6f6974707972636e6561737268746977 XMM03=00000000000000000000000000777074 XMM04=40404040404040404040404040404040 XMM05=5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a XMM06=20202020202020202020202020202020 XMM07=ffffffffffff00ffffff00ffffff00ff XMM08=00002000000000202020002020200000 XMM09=ffffffffffff00ffffff00ffffff00ff XMM10=00002000000000202020002020200000 XMM11=00000000000000000000000000000000 XMM12=00000000000000000000000000000000 XMM13=00000000000000000000000000000000 XMM14=00000000000000000000000000000000 XMM15=00000000000000000000000000000000