sysv_free_block: flc_count > flc_size sysv_free_block: flc_count > flc_size sysv_free_block: flc_count > flc_size sysv_free_block: flc_count > flc_size sysv_free_block: flc_count > flc_size sysv_free_block: flc_count > flc_size sysv_free_block: flc_count > flc_size sysv_free_block: flc_count > flc_size sysv_free_block: flc_count > flc_size ================================================================== BUG: KASAN: use-after-free in sysv_new_block+0x819/0x990 fs/sysv/balloc.c:113 Read of size 4 at addr ffff88807279b0c8 by task syz-executor355/5066 CPU: 0 PID: 5066 Comm: syz-executor355 Not tainted 6.1.0-syzkaller-13139-gf9ff5644bcc0 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xd1/0x138 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:306 [inline] print_report+0x15e/0x45d mm/kasan/report.c:417 kasan_report+0xbf/0x1f0 mm/kasan/report.c:517 sysv_new_block+0x819/0x990 fs/sysv/balloc.c:113 alloc_branch fs/sysv/itree.c:134 [inline] get_block+0x26b/0x1580 fs/sysv/itree.c:251 __block_write_begin_int+0x3bd/0x14b0 fs/buffer.c:1991 __block_write_begin fs/buffer.c:2041 [inline] block_write_begin+0xb9/0x4d0 fs/buffer.c:2102 sysv_write_begin+0x31/0xd0 fs/sysv/itree.c:485 generic_perform_write+0x256/0x570 mm/filemap.c:3772 __generic_file_write_iter+0x2ae/0x500 mm/filemap.c:3900 generic_file_write_iter+0xe3/0x350 mm/filemap.c:3932 call_write_iter include/linux/fs.h:2186 [inline] new_sync_write fs/read_write.c:491 [inline] vfs_write+0x9ed/0xdd0 fs/read_write.c:584 ksys_write+0x12b/0x250 fs/read_write.c:637 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7fd4d187e9a9 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 11 15 00 00 90 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 c0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffcbc19ce68 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 0030656c69662f2e RCX: 00007fd4d187e9a9 RDX: 00000000fffffe45 RSI: 00000000200000c0 RDI: 0000000000000004 RBP: 0000000000000000 R08: 00007ffcbc19ce90 R09: 00007ffcbc19ce90 R10: 00007ffcbc19cd30 R11: 0000000000000246 R12: 00007ffcbc19ce8c R13: 00007ffcbc19cec0 R14: 00007ffcbc19cea0 R15: 0000000000000001 The buggy address belongs to the physical page: page:ffffea0001c9e6c0 refcount:0 mapcount:0 mapping:0000000000000000 index:0x1 pfn:0x7279b flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000000000 ffffea0001c9e708 ffffea0001c9e688 0000000000000000 raw: 0000000000000001 0000000000000000 00000000ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as freed page last allocated via order 0, migratetype Movable, gfp_mask 0x8(__GFP_MOVABLE), pid 1, tgid 1 (swapper/0), ts 11125023808, free_ts 11891297509 split_map_pages+0x1ef/0x520 mm/compaction.c:97 isolate_freepages_range+0x313/0x350 mm/compaction.c:735 alloc_contig_range+0x2fa/0x4a0 mm/page_alloc.c:9363 __alloc_contig_pages mm/page_alloc.c:9386 [inline] alloc_contig_pages+0x35e/0x4c0 mm/page_alloc.c:9463 debug_vm_pgtable_alloc_huge_page mm/debug_vm_pgtable.c:1065 [inline] init_args mm/debug_vm_pgtable.c:1188 [inline] debug_vm_pgtable+0x899/0x296f mm/debug_vm_pgtable.c:1226 do_one_initcall+0x141/0x790 init/main.c:1306 do_initcall_level init/main.c:1379 [inline] do_initcalls init/main.c:1395 [inline] do_basic_setup init/main.c:1414 [inline] kernel_init_freeable+0x6f9/0x782 init/main.c:1634 kernel_init+0x1e/0x1d0 init/main.c:1522 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1446 [inline] free_pcp_prepare+0x65c/0xc00 mm/page_alloc.c:1496 free_unref_page_prepare mm/page_alloc.c:3369 [inline] free_unref_page+0x1d/0x490 mm/page_alloc.c:3464 free_contig_range+0xb5/0x180 mm/page_alloc.c:9485 destroy_args+0xa8/0x64c mm/debug_vm_pgtable.c:998 debug_vm_pgtable+0x28de/0x296f mm/debug_vm_pgtable.c:1318 do_one_initcall+0x141/0x790 init/main.c:1306 do_initcall_level init/main.c:1379 [inline] do_initcalls init/main.c:1395 [inline] do_basic_setup init/main.c:1414 [inline] kernel_init_freeable+0x6f9/0x782 init/main.c:1634 kernel_init+0x1e/0x1d0 init/main.c:1522 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308 Memory state around the buggy address: ffff88807279af80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ffff88807279b000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff >ffff88807279b080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ^ ffff88807279b100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ffff88807279b180: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ==================================================================