Hello, syzbot found the following issue on: HEAD commit: 1e760fa3596e Merge tag 'gfs2-v6.3-rc3-fix' of git://git.ke.. git tree: upstream console+strace: https://syzkaller.appspot.com/x/log.txt?x=1746cb0ec80000 kernel config: https://syzkaller.appspot.com/x/.config?x=acdb62bf488a8fe5 dashboard link: https://syzkaller.appspot.com/bug?extid=04e8b36eaa27ecf7f840 compiler: Debian clang version 15.0.7, GNU ld (GNU Binutils for Debian) 2.35.2 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=16d5c261c80000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=155eba51c80000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/17229b6e6fe0/disk-1e760fa3.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/69b5d310fba0/vmlinux-1e760fa3.xz kernel image: https://storage.googleapis.com/syzbot-assets/0c65624aace9/bzImage-1e760fa3.xz mounted in repro: https://storage.googleapis.com/syzbot-assets/18aebd583db0/mount_0.gz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+04e8b36eaa27ecf7f840@xxxxxxxxxxxxxxxxxxxxxxxxx REISERFS (device loop0): journal params: device loop0, size 512, journal first block 18, max trans len 256, max batch 225, max commit age 30, max trans age 30 REISERFS (device loop0): checking transaction log (loop0) REISERFS (device loop0): Using r5 hash to sort names ================================================================== BUG: KASAN: use-after-free in reiserfs_get_unused_objectid+0x231/0x490 fs/reiserfs/objectid.c:87 Read of size 250888 at addr ffff888073c6b058 by task syz-executor137/5072 CPU: 1 PID: 5072 Comm: syz-executor137 Not tainted 6.3.0-rc3-syzkaller-00031-g1e760fa3596e #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/02/2023 Call Trace: <TASK> __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1e7/0x2d0 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:319 [inline] print_report+0x163/0x540 mm/kasan/report.c:430 kasan_report+0x176/0x1b0 mm/kasan/report.c:536 kasan_check_range+0x283/0x290 mm/kasan/generic.c:187 __asan_memmove+0x29/0x70 mm/kasan/shadow.c:94 reiserfs_get_unused_objectid+0x231/0x490 fs/reiserfs/objectid.c:87 reiserfs_new_inode+0x2bc/0x1da0 fs/reiserfs/inode.c:1944 reiserfs_mkdir+0x5b0/0x8f0 fs/reiserfs/namei.c:845 xattr_mkdir fs/reiserfs/xattr.c:76 [inline] create_privroot fs/reiserfs/xattr.c:882 [inline] reiserfs_xattr_init+0x34c/0x730 fs/reiserfs/xattr.c:1005 reiserfs_fill_super+0x2207/0x2620 fs/reiserfs/super.c:2175 mount_bdev+0x271/0x3a0 fs/super.c:1380 legacy_get_tree+0xef/0x190 fs/fs_context.c:610 vfs_get_tree+0x8c/0x270 fs/super.c:1510 do_new_mount+0x28f/0xae0 fs/namespace.c:3042 do_mount fs/namespace.c:3385 [inline] __do_sys_mount fs/namespace.c:3594 [inline] __se_sys_mount+0x2d9/0x3c0 fs/namespace.c:3571 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7f650fbcb3aa Code: 48 c7 c2 c0 ff ff ff f7 d8 64 89 02 b8 ff ff ff ff eb d2 e8 f8 03 00 00 0f 1f 84 00 00 00 00 00 49 89 ca b8 a5 00 00 00 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:00007ffc35632868 EFLAGS: 00000286 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00007f650fbcb3aa RDX: 0000000020000080 RSI: 0000000020000040 RDI: 00007ffc35632880 RBP: 00007ffc35632880 R08: 00007ffc356328c0 R09: 0000000000001132 R10: 0000000000008008 R11: 0000000000000286 R12: 0000000000000004 R13: 0000555555df42c0 R14: 0000000000008008 R15: 00007ffc356328c0 </TASK> The buggy address belongs to the physical page: page:ffffea0001cf1ac0 refcount:3 mapcount:0 mapping:ffff888144c549f8 index:0x10 pfn:0x73c6b memcg:ffff888140196000 aops:def_blk_aops ino:700000 flags: 0xfff00000002022(referenced|active|private|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000002022 0000000000000000 dead000000000122 ffff888144c549f8 raw: 0000000000000010 ffff8880751fc910 00000003ffffffff ffff888140196000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 0, migratetype Movable, gfp_mask 0x148c48(GFP_NOFS|__GFP_NOFAIL|__GFP_COMP|__GFP_HARDWALL|__GFP_MOVABLE), pid 5072, tgid 5072 (syz-executor137), ts 69127009678, free_ts 60810646673 prep_new_page mm/page_alloc.c:2552 [inline] get_page_from_freelist+0x3246/0x33c0 mm/page_alloc.c:4325 __alloc_pages+0x255/0x670 mm/page_alloc.c:5591 folio_alloc+0x1e/0x60 mm/mempolicy.c:2293 filemap_alloc_folio+0xde/0x500 mm/filemap.c:976 __filemap_get_folio+0x719/0xe50 mm/filemap.c:1970 pagecache_get_page+0x2c/0x240 mm/folio-compat.c:99 find_or_create_page include/linux/pagemap.h:632 [inline] grow_dev_page fs/buffer.c:989 [inline] grow_buffers fs/buffer.c:1054 [inline] __getblk_slow fs/buffer.c:1081 [inline] __getblk_gfp+0x215/0xa40 fs/buffer.c:1376 __bread_gfp+0x2e/0x380 fs/buffer.c:1410 sb_bread include/linux/buffer_head.h:341 [inline] read_super_block+0x91/0x800 fs/reiserfs/super.c:1604 reiserfs_fill_super+0x912/0x2620 fs/reiserfs/super.c:1966 mount_bdev+0x271/0x3a0 fs/super.c:1380 legacy_get_tree+0xef/0x190 fs/fs_context.c:610 vfs_get_tree+0x8c/0x270 fs/super.c:1510 do_new_mount+0x28f/0xae0 fs/namespace.c:3042 do_mount fs/namespace.c:3385 [inline] __do_sys_mount fs/namespace.c:3594 [inline] __se_sys_mount+0x2d9/0x3c0 fs/namespace.c:3571 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1453 [inline] free_pcp_prepare mm/page_alloc.c:1503 [inline] free_unref_page_prepare+0xe2f/0xe70 mm/page_alloc.c:3387 free_unref_page_list+0x596/0x830 mm/page_alloc.c:3528 release_pages+0x219e/0x2470 mm/swap.c:1042 tlb_batch_pages_flush mm/mmu_gather.c:97 [inline] tlb_flush_mmu_free mm/mmu_gather.c:292 [inline] tlb_flush_mmu+0x100/0x210 mm/mmu_gather.c:299 tlb_finish_mmu+0xd4/0x1f0 mm/mmu_gather.c:391 exit_mmap+0x2c9/0x850 mm/mmap.c:3047 __mmput+0x115/0x3c0 kernel/fork.c:1209 exit_mm+0x227/0x310 kernel/exit.c:563 do_exit+0x612/0x2290 kernel/exit.c:856 do_group_exit+0x206/0x2c0 kernel/exit.c:1019 __do_sys_exit_group kernel/exit.c:1030 [inline] __se_sys_exit_group kernel/exit.c:1028 [inline] __x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1028 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd Memory state around the buggy address: ffff888073c6bf00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff888073c6bf80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff888073c6c000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ^ ffff888073c6c080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ffff888073c6c100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ================================================================== --- This report is generated by a bot. 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