================================================================== BUG: KASAN: slab-use-after-free in vma_multi_allowed+0x172/0x1b0 Read of size 8 at addr ffff88800d7727d8 by task syz-executor.6/5462 CPU: 1 UID: 0 PID: 5462 Comm: syz-executor.6 Not tainted 6.17.0-rc1-next-20250813 #1 PREEMPT(voluntary) Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014 Call Trace: dump_stack_lvl+0xca/0x120 print_report+0xcb/0x610 kasan_report+0xca/0x100 vma_multi_allowed+0x172/0x1b0 __do_sys_mremap+0xcb7/0x1410 do_syscall_64+0xbf/0x360 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f9e3a849b19 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f9e37dbf188 EFLAGS: 00000246 ORIG_RAX: 0000000000000019 RAX: ffffffffffffffda RBX: 00007f9e3a95cf60 RCX: 00007f9e3a849b19 RDX: 0000000000001000 RSI: 0000000000001000 RDI: 0000000020870000 RBP: 00007f9e3a8a3f6d R08: 0000000020ffa000 R09: 0000000000000000 R10: 0000000000000007 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffde75668ef R14: 00007f9e37dbf300 R15: 0000000000022000 Allocated by task 5462: kasan_save_stack+0x24/0x50 kasan_save_track+0x14/0x30 __kasan_slab_alloc+0x59/0x70 kmem_cache_alloc_noprof+0x13c/0x3d0 vm_area_dup+0x25/0x6f0 __split_vma+0x179/0xde0 vms_gather_munmap_vmas+0x178/0xc70 do_vmi_align_munmap+0x25b/0x550 do_vmi_munmap+0x1eb/0x3c0 do_munmap+0xbd/0x100 mremap_to+0x242/0x450 __do_sys_mremap+0xca2/0x1410 do_syscall_64+0xbf/0x360 entry_SYSCALL_64_after_hwframe+0x77/0x7f Freed by task 5453: kasan_save_stack+0x24/0x50 kasan_save_track+0x14/0x30 __kasan_save_free_info+0x3a/0x60 __kasan_slab_free+0x3f/0x50 slab_free_after_rcu_debug+0xd6/0x290 rcu_core+0x7c8/0x1800 handle_softirqs+0x1b1/0x770 __irq_exit_rcu+0xc4/0x100 irq_exit_rcu+0x9/0x20 sysvec_apic_timer_interrupt+0x70/0x80 asm_sysvec_apic_timer_interrupt+0x1a/0x20 Last potentially related work creation: kasan_save_stack+0x24/0x50 kasan_record_aux_stack+0x89/0xa0 kmem_cache_free+0x145/0x460 vms_complete_munmap_vmas+0x549/0x9f0 do_vmi_align_munmap+0x3db/0x550 do_vmi_munmap+0x1eb/0x3c0 do_munmap+0xbd/0x100 mremap_to+0x242/0x450 __do_sys_mremap+0xca2/0x1410 do_syscall_64+0xbf/0x360 entry_SYSCALL_64_after_hwframe+0x77/0x7f The buggy address belongs to the object at ffff88800d772780 which belongs to the cache vm_area_struct of size 256 The buggy address is located 88 bytes inside of freed 256-byte region [ffff88800d772780, ffff88800d772880) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0xd772 memcg:ffff88800a14b781 anon flags: 0x100000000000000(node=0|zone=1) page_type: f5(slab) raw: 0100000000000000 ffff888008fffc80 0000000000000000 dead000000000001 raw: 0000000000000000 00000000800c000c 00000000f5000000 ffff88800a14b781 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff88800d772680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88800d772700: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc >ffff88800d772780: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88800d772800: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88800d772880: fc fc fc fc fc fc fc fc 00 00 00 00 00 00 00 00 ================================================================== Bluetooth: hci0: Opcode 0x0401 failed: -4 program syz-executor.6 is using a deprecated SCSI ioctl, please convert it to SG_IO ata1.00: invalid service action 31 Bluetooth: hci0: command 0x0c1a tx timeout tmpfs: Bad value for 'mpol' tmpfs: Bad value for 'mpol' syz-executor.6 uses obsolete (PF_INET,SOCK_PACKET) loop3: detected capacity change from 0 to 512 EXT4-fs warning (device loop3): read_mmp_block:114: Error -117 while reading MMP block 12 loop3: detected capacity change from 0 to 512 EXT4-fs warning (device loop3): read_mmp_block:114: Error -117 while reading MMP block 12 TCP: TCP_TX_DELAY enabled No control pipe specified loop4: detected capacity change from 0 to 512 loop3: detected capacity change from 0 to 512 EXT4-fs warning (device loop4): read_mmp_block:114: Error -117 while reading MMP block 12 EXT4-fs warning (device loop3): read_mmp_block:114: Error -117 while reading MMP block 12 loop3: detected capacity change from 0 to 512 EXT4-fs warning (device loop3): read_mmp_block:114: Error -117 while reading MMP block 12 loop4: detected capacity change from 0 to 512 EXT4-fs warning (device loop4): read_mmp_block:114: Error -117 while reading MMP block 12 loop3: detected capacity change from 0 to 512 EXT4-fs warning (device loop3): read_mmp_block:114: Error -117 while reading MMP block 12 loop4: detected capacity change from 0 to 512 EXT4-fs warning (device loop4): read_mmp_block:114: Error -117 while reading MMP block 12 syz-executor.2 (5770) used greatest stack depth: 23984 bytes left audit: type=1326 audit(2000000029.600:16): auid=0 uid=0 gid=0 ses=4 subj=system_u:system_r:kernel_t:s0 pid=5786 comm="syz-executor.1" exe="/syz-executor.1" sig=31 arch=c000003e syscall=202 compat=0 ip=0x7fb6d5158b19 code=0x0 audit: type=1326 audit(2000000030.416:17): auid=0 uid=0 gid=0 ses=4 subj=system_u:system_r:kernel_t:s0 pid=5786 comm="syz-executor.1" exe="/syz-executor.1" sig=31 arch=c000003e syscall=202 compat=0 ip=0x7fb6d5158b19 code=0x0 audit: type=1326 audit(2000000030.526:18): auid=0 uid=0 gid=0 ses=4 subj=system_u:system_r:kernel_t:s0 pid=5809 comm="syz-executor.1" exe="/syz-executor.1" sig=31 arch=c000003e syscall=202 compat=0 ip=0x7fb6d5158b19 code=0x0 sr 1:0:0:0: [sr0] CDROM not ready. Make sure there is a disc in the drive. sr 1:0:0:0: [sr0] CDROM not ready. Make sure there is a disc in the drive. audit: type=1326 audit(2000000031.416:19): auid=0 uid=0 gid=0 ses=4 subj=system_u:system_r:kernel_t:s0 pid=5841 comm="syz-executor.1" exe="/syz-executor.1" sig=31 arch=c000003e syscall=202 compat=0 ip=0x7fb6d5158b19 code=0x0 audit: type=1326 audit(2000000032.341:20): auid=0 uid=0 gid=0 ses=4 subj=system_u:system_r:kernel_t:s0 pid=5888 comm="syz-executor.1" exe="/syz-executor.1" sig=31 arch=c000003e syscall=202 compat=0 ip=0x7fb6d5158b19 code=0x0 program syz-executor.0 is using a deprecated SCSI ioctl, please convert it to SG_IO program syz-executor.0 is using a deprecated SCSI ioctl, please convert it to SG_IO