Debian GNU/Linux 11 syzkaller ttyS0 syzkaller login: [ 38.956553] BUG: Bad rss-counter state mm:00000000c76e6b1c type:MM_FILEPAGES val:33 [ 38.957271] BUG: Bad rss-counter state mm:00000000c76e6b1c type:MM_ANONPAGES val:22 [ 39.004436] ================================================================== [ 39.005024] BUG: KASAN: slab-use-after-free in vma_interval_tree_remove+0xc75/0xec0 [ 39.005681] Read of size 8 at addr ffff88801625aa50 by task sshd/227 [ 39.006167] [ 39.006313] CPU: 0 PID: 227 Comm: sshd Not tainted 6.4.0-rc7-next-20230620 #1 [ 39.006883] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014 [ 39.007495] Call Trace: [ 39.007703] [ 39.007935] dump_stack_lvl+0x91/0xf0 [ 39.008258] print_report+0xcc/0x620 [ 39.008573] ? __virt_addr_valid+0x102/0x340 [ 39.008929] ? vma_interval_tree_remove+0xc75/0xec0 [ 39.009348] ? vma_interval_tree_remove+0xc75/0xec0 [ 39.009743] kasan_report+0xbe/0xf0 [ 39.010058] ? vma_interval_tree_remove+0xc75/0xec0 [ 39.010456] vma_interval_tree_remove+0xc75/0xec0 [ 39.010844] vma_prepare+0xc54/0x11a0 [ 39.011151] __split_vma+0x5af/0x950 [ 39.011454] ? __pfx___split_vma+0x10/0x10 [ 39.011792] ? find_held_lock+0x2c/0x110 [ 39.012139] do_vmi_align_munmap+0x2ba/0x11f0 [ 39.012505] ? lock_is_held_type+0x9f/0x120 [ 39.012855] ? __pfx_do_vmi_align_munmap+0x10/0x10 [ 39.013266] ? mtree_range_walk+0x632/0x900 [ 39.013628] ? mas_walk+0x5c7/0x7c0 [ 39.013938] do_vmi_munmap+0x1f1/0x2b0 [ 39.014256] mmap_region+0x1f9/0x2660 [ 39.014569] ? vm_mmap_pgoff+0x15c/0x3a0 [ 39.014929] ? __pfx_arch_get_unmapped_area_topdown+0x10/0x10 [ 39.015382] ? __pfx_lock_acquire+0x10/0x10 [ 39.015729] ? __pfx_mmap_region+0x10/0x10 [ 39.016114] ? security_mmap_addr+0x7d/0xa0 [ 39.016457] ? get_unmapped_area+0x1f5/0x3f0 [ 39.016813] do_mmap+0x854/0xf00 [ 39.017100] vm_mmap_pgoff+0x1a6/0x3a0 [ 39.017452] ? __pfx_vm_mmap_pgoff+0x10/0x10 [ 39.017818] ksys_mmap_pgoff+0x3af/0x500 [ 39.018148] do_syscall_64+0x3f/0x90 [ 39.018460] entry_SYSCALL_64_after_hwframe+0x6e/0xd8 [ 39.018883] RIP: 0033:0x7fba38fb2d82 [ 39.019175] 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 [ 39.020537] RSP: 002b:00007fff8472ed48 EFLAGS: 00000206 ORIG_RAX: 0000000000000009 [ 39.021123] RAX: ffffffffffffffda RBX: 0000000000000812 RCX: 00007fba38fb2d82 [ 39.021706] RDX: 0000000000000005 RSI: 0000000000001000 RDI: 00007fba383ec000 [ 39.022268] RBP: 00007fba383ec000 R08: 0000000000000009 R09: 0000000000001000 [ 39.022831] R10: 0000000000000812 R11: 0000000000000206 R12: 00005556a4beef70 [ 39.023401] R13: 00007fff8472ed60 R14: 00007fff8472ed90 R15: 00007fff8472f0f0 [ 39.023956] [ 39.024147] [ 39.024288] Allocated by task 217: [ 39.024568] kasan_save_stack+0x22/0x50 [ 39.024897] kasan_set_track+0x25/0x30 [ 39.025218] __kasan_slab_alloc+0x59/0x70 [ 39.025571] kmem_cache_alloc+0x16b/0x370 [ 39.025936] vm_area_dup+0x20/0x160 [ 39.026231] __split_vma+0x170/0x950 [ 39.026532] split_vma+0xc6/0x110 [ 39.026831] mprotect_fixup+0x8d2/0xb30 [ 39.027184] do_mprotect_pkey+0x87e/0xd40 [ 39.027523] __x64_sys_mprotect+0x78/0xc0 [ 39.027862] do_syscall_64+0x3f/0x90 [ 39.028173] entry_SYSCALL_64_after_hwframe+0x6e/0xd8 [ 39.028591] [ 39.028732] Freed by task 217: [ 39.028993] kasan_save_stack+0x22/0x50 [ 39.029339] kasan_set_track+0x25/0x30 [ 39.029660] kasan_save_free_info+0x2b/0x50 [ 39.030032] __kasan_slab_free+0x10a/0x190 [ 39.030381] kmem_cache_free+0x10d/0x4d0 [ 39.030717] rcu_core+0x8c8/0x2860 [ 39.031015] __do_softirq+0x1b7/0x7d4 [ 39.031329] [ 39.031471] Last potentially related work creation: [ 39.031849] kasan_save_stack+0x22/0x50 [ 39.032183] __kasan_record_aux_stack+0x8e/0xa0 [ 39.032559] __call_rcu_common.constprop.0+0x6a/0xb90 [ 39.032978] remove_vma+0x139/0x170 [ 39.033299] do_vmi_align_munmap+0xd4a/0x11f0 [ 39.033653] do_vmi_munmap+0x1f1/0x2b0 [ 39.037592] __vm_munmap+0x138/0x3a0 [ 39.037936] __x64_sys_munmap+0x59/0x80 [ 39.038269] do_syscall_64+0x3f/0x90 [ 39.038577] entry_SYSCALL_64_after_hwframe+0x6e/0xd8 [ 39.038993] [ 39.039133] The buggy address belongs to the object at ffff88801625a9f8 [ 39.039133] which belongs to the cache vm_area_struct of size 168 [ 39.040090] The buggy address is located 88 bytes inside of [ 39.040090] freed 168-byte region [ffff88801625a9f8, ffff88801625aaa0) [ 39.041003] [ 39.041148] The buggy address belongs to the physical page: [ 39.041595] page:00000000a74ea91e refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1625a [ 39.042284] memcg:ffff88800e251201 [ 39.042562] flags: 0x100000000000200(slab|node=0|zone=1) [ 39.042980] page_type: 0xffffffff() [ 39.043274] raw: 0100000000000200 ffff8880087a0c80 dead000000000122 0000000000000000 [ 39.043863] raw: 0000000000000000 0000000000110011 00000001ffffffff ffff88800e251201 [ 39.044417] page dumped because: kasan: bad access detected [ 39.044819] [ 39.044962] Memory state around the buggy address: [ 39.045347] ffff88801625a900: fc fc 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 39.045878] ffff88801625a980: 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc fa [ 39.046402] >ffff88801625aa00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 39.046944] ^ [ 39.047378] ffff88801625aa80: fb fb fb fb fc fc fc fc fc fc fc fc fa fb fb fb [ 39.047927] ffff88801625ab00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 39.048470] ================================================================== [ 39.049200] Disabling lock debugging due to kernel taint [ 45.222209] BUG: Bad rss-counter state mm:0000000043e93d8c type:MM_FILEPAGES val:33 [ 45.222938] BUG: Bad rss-counter state mm:0000000043e93d8c type:MM_ANONPAGES val:22 [ 46.472711] BUG: Bad rss-counter state mm:0000000031f6effe type:MM_FILEPAGES val:33 [ 46.473411] BUG: Bad rss-counter state mm:0000000031f6effe type:MM_ANONPAGES val:22 Warning: Permanently added '[localhost]:47287' (ECDSA) to the list of known hosts. 2023/06/21 10:02:05 fuzzer started 2023/06/21 10:02:05 dialing manager at localhost:36067 2023/06/21 10:02:05 checking machine... 2023/06/21 10:02:05 checking revisions... [ 47.395494] kmemleak: Automatic memory scanning thread ended 2023/06/21 10:02:05 testing simple program... [ 47.439007] cgroup: Unknown subsys name 'net' [ 47.501668] cgroup: Unknown subsys name 'rlimit' executing program executing program executing program VM DIAGNOSIS: 10:02:05 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=00007f596801d260 CR3=000000000c900000 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=756e696c2d34365f3638782f62696c2f XMM01=732e746964756162696c2f756e672d78 XMM02=00312e6f732e746964756162696c2f75 XMM03=6e672d78756e696c2d34365f3638782f XMM04=00000000000000000000000000000000 XMM05=00000000000000000000000000000000 XMM06=00000000000000000000000000000000 XMM07=00000000000000000000000000000000 XMM08=00000000000000000000000000000000 XMM09=00000000000000000000000000000000 XMM10=00000000000000000000000000000000 XMM11=00000000000000000000000000000000 XMM12=00000000000000000000000000000000 XMM13=00000000000000000000000000000000 XMM14=00000000000000000000000000000000 XMM15=00000000000000000000000000000000 info registers vcpu 1 RAX=0000000000000009 RBX=00007f5967c0e9e8 RCX=0000000000000012 RDX=00007f5967c0e8d0 RSI=00007f59678c72ad RDI=00007f5967c0e9a8 RBP=0000000000000012 RSP=00007ffc9808e000 R8 =000000000000ffff R9 =000000000000000d R10=0000000009691974 R11=00007f59678c1308 R12=00007f59678c8718 R13=0000000000000012 R14=00007f5967c2a000 R15=00007f5968054ca0 RIP=00007f5968040617 RFL=00000212 [----A--] CPL=3 II=0 A20=1 SMM=0 HLT=0 ES =0000 0000000000000000 00000000 00000000 CS =0033 0000000000000000 ffffffff 00a0fb00 DPL=3 CS64 [-RA] SS =002b 0000000000000000 ffffffff 00c0f300 DPL=3 DS [-WA] DS =0000 0000000000000000 00000000 00000000 FS =0000 0000000000000000 00000000 00000000 GS =0000 0000000000000000 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=00007f59674be054 CR3=000000000c900000 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=ff00ffffff0000000000000000000000 XMM01=0100010100ffffffffffffffffffffff XMM02=42494c4700342e332e325f4342494c47 XMM03=00000000000000000000000000470035 XMM04=4342494c4700362e322e325f4342494c XMM05=00007f5967a71f6000007f5967c2b950 XMM06=00007f5967c2b44000007f5967c2af20 XMM07=00007f596757512000007f5967574b10 XMM08=00007f59675745f000007f5967574060 XMM09=00000000000000000000000000000000 XMM10=00000000000000000000000000000000 XMM11=00000000000000000000000000000000 XMM12=00000000000000000000000000000000 XMM13=00000000000000000000000000000000 XMM14=00000000000000000000000000000000 XMM15=00000000000000000000000000000000