syz-executor239: attempt to access beyond end of device loop0: rw=0, sector=6491536, nr_sectors = 2 limit=128 Buffer I/O error on dev loop0, logical block 3245768, async page read unable to read i-node block ================================================================== BUG: KASAN: use-after-free in sysv_new_block+0x788/0x960 fs/sysv/balloc.c:113 Read of size 4 at addr ffff88806f0d40c8 by task syz-executor239/4260 CPU: 0 PID: 4260 Comm: syz-executor239 Not tainted 6.1.127-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1e3/0x2cb lib/dump_stack.c:106 print_address_description mm/kasan/report.c:316 [inline] print_report+0x15f/0x4f0 mm/kasan/report.c:427 kasan_report+0x136/0x160 mm/kasan/report.c:531 sysv_new_block+0x788/0x960 fs/sysv/balloc.c:113 alloc_branch fs/sysv/itree.c:134 [inline] get_block+0x2e7/0x1790 fs/sysv/itree.c:253 __block_write_begin_int+0x544/0x1a30 fs/buffer.c:1991 __block_write_begin fs/buffer.c:2041 [inline] block_write_begin+0x98/0x1f0 fs/buffer.c:2102 sysv_write_begin+0x2d/0x60 fs/sysv/itree.c:487 page_symlink+0x2c1/0x4e0 fs/namei.c:5218 sysv_symlink+0xcb/0x180 fs/sysv/namei.c:86 vfs_symlink+0x247/0x3d0 fs/namei.c:4471 do_symlinkat+0x21e/0x390 fs/namei.c:4500 __do_sys_symlink fs/namei.c:4522 [inline] __se_sys_symlink fs/namei.c:4520 [inline] __x64_sys_symlink+0x7a/0x90 fs/namei.c:4520 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7f25f0c1e0e9 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 21 18 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 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffe97f5e688 EFLAGS: 00000246 ORIG_RAX: 0000000000000058 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f25f0c1e0e9 RDX: 0000000000000000 RSI: 000000002000acc0 RDI: 000000002000ad80 RBP: 0000000000000004 R08: 0000000000009e80 R09: 0000000000000000 R10: 00007ffe97f5e710 R11: 0000000000000246 R12: 00007ffe97f5e6d0 R13: 00007ffe97f5e710 R14: 0000000000010000 R15: 0000000000000003 The buggy address belongs to the physical page: page:ffffea0001bc3500 refcount:0 mapcount:0 mapping:0000000000000000 index:0x1 pfn:0x6f0d4 flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000000000 ffffea0001bc3548 ffffea0001bc34c8 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 20233614458, free_ts 21685061719 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x18d/0x1b0 mm/page_alloc.c:2532 split_map_pages+0x246/0x510 mm/compaction.c:97 isolate_freepages_range+0x47c/0x4e0 mm/compaction.c:735 alloc_contig_range+0x62a/0x990 mm/page_alloc.c:9440 __alloc_contig_pages mm/page_alloc.c:9463 [inline] alloc_contig_pages+0x3f0/0x4e0 mm/page_alloc.c:9543 debug_vm_pgtable_alloc_huge_page+0xb9/0x108 mm/debug_vm_pgtable.c:1098 init_args+0xc92/0x1022 mm/debug_vm_pgtable.c:1221 debug_vm_pgtable+0xaa/0x46b mm/debug_vm_pgtable.c:1259 do_one_initcall+0x265/0x8f0 init/main.c:1298 do_initcall_level+0x157/0x207 init/main.c:1371 do_initcalls+0x49/0x86 init/main.c:1387 kernel_init_freeable+0x45c/0x60f init/main.c:1626 kernel_init+0x19/0x290 init/main.c:1514 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1459 [inline] free_pcp_prepare mm/page_alloc.c:1509 [inline] free_unref_page_prepare+0x12a6/0x15b0 mm/page_alloc.c:3384 free_unref_page+0x33/0x3e0 mm/page_alloc.c:3479 free_contig_range+0x9a/0x150 mm/page_alloc.c:9565 destroy_args+0xfe/0x997 mm/debug_vm_pgtable.c:1031 debug_vm_pgtable+0x416/0x46b mm/debug_vm_pgtable.c:1354 do_one_initcall+0x265/0x8f0 init/main.c:1298 do_initcall_level+0x157/0x207 init/main.c:1371 do_initcalls+0x49/0x86 init/main.c:1387 kernel_init_freeable+0x45c/0x60f init/main.c:1626 kernel_init+0x19/0x290 init/main.c:1514 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 Memory state around the buggy address: ffff88806f0d3f80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ffff88806f0d4000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff >ffff88806f0d4080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ^ ffff88806f0d4100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ffff88806f0d4180: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ==================================================================