Hello, syzbot found the following issue on: HEAD commit: 022ce8862dff Merge tag 'i2c-for-6.4-rc6' of git://git.kern.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=17b1e263280000 kernel config: https://syzkaller.appspot.com/x/.config?x=3c980bfe8b399968 dashboard link: https://syzkaller.appspot.com/bug?extid=741810aea4ac24243b2f compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2 userspace arch: i386 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/7bc7510fe41f/non_bootable_disk-022ce886.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/dec1ef12175c/vmlinux-022ce886.xz kernel image: https://storage.googleapis.com/syzbot-assets/c9c8021b7538/bzImage-022ce886.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+741810aea4ac24243b2f@xxxxxxxxxxxxxxxxxxxxxxxxx loop1: detected capacity change from 0 to 512 EXT4-fs (loop1): encrypted files will use data=ordered instead of data journaling mode ================================================================== BUG: KASAN: slab-use-after-free in check_igot_inode+0x196/0x1c0 fs/ext4/inode.c:4648 Read of size 8 at addr ffff88805f1b0c70 by task syz-executor.1/16946 CPU: 2 PID: 16946 Comm: syz-executor.1 Not tainted 6.4.0-rc5-syzkaller-00305-g022ce8862dff #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.14.0-2 04/01/2014 Call Trace: <TASK> __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xd9/0x150 lib/dump_stack.c:106 print_address_description.constprop.0+0x2c/0x3c0 mm/kasan/report.c:351 print_report mm/kasan/report.c:462 [inline] kasan_report+0x11c/0x130 mm/kasan/report.c:572 check_igot_inode+0x196/0x1c0 fs/ext4/inode.c:4648 __ext4_iget+0x1598/0x4460 fs/ext4/inode.c:4700 __ext4_fill_super fs/ext4/super.c:5446 [inline] ext4_fill_super+0x680f/0xafa0 fs/ext4/super.c:5672 get_tree_bdev+0x44a/0x770 fs/super.c:1303 vfs_get_tree+0x8d/0x350 fs/super.c:1510 do_new_mount fs/namespace.c:3039 [inline] path_mount+0x134b/0x1e40 fs/namespace.c:3369 do_mount fs/namespace.c:3382 [inline] __do_sys_mount fs/namespace.c:3591 [inline] __se_sys_mount fs/namespace.c:3568 [inline] __ia32_sys_mount+0x282/0x300 fs/namespace.c:3568 do_syscall_32_irqs_on arch/x86/entry/common.c:112 [inline] __do_fast_syscall_32+0x65/0xf0 arch/x86/entry/common.c:178 do_fast_syscall_32+0x33/0x70 arch/x86/entry/common.c:203 entry_SYSENTER_compat_after_hwframe+0x70/0x82 RIP: 0023:0xf7f26579 Code: b8 01 10 06 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 00 00 00 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 8d b4 26 00 00 00 00 8d b4 26 00 00 00 00 RSP: 002b:00000000f7f21410 EFLAGS: 00000296 ORIG_RAX: 0000000000000015 RAX: ffffffffffffffda RBX: 00000000f7f21480 RCX: 0000000020000000 RDX: 0000000020000040 RSI: 000000000000000e RDI: 00000000f7f214c0 RBP: 00000000f7f214c0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000292 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 </TASK> Allocated by task 5890: kasan_save_stack+0x22/0x40 mm/kasan/common.c:45 kasan_set_track+0x25/0x30 mm/kasan/common.c:52 __kasan_slab_alloc+0x7f/0x90 mm/kasan/common.c:328 kasan_slab_alloc include/linux/kasan.h:186 [inline] slab_post_alloc_hook mm/slab.h:711 [inline] slab_alloc_node mm/slub.c:3451 [inline] slab_alloc mm/slub.c:3459 [inline] __kmem_cache_alloc_lru mm/slub.c:3466 [inline] kmem_cache_alloc_lru+0x20a/0x600 mm/slub.c:3482 alloc_inode_sb include/linux/fs.h:2705 [inline] reiserfs_alloc_inode+0x28/0xc0 fs/reiserfs/super.c:642 alloc_inode+0x61/0x230 fs/inode.c:260 new_inode_pseudo fs/inode.c:1018 [inline] new_inode+0x2b/0x280 fs/inode.c:1046 reiserfs_mkdir+0x1f1/0x990 fs/reiserfs/namei.c:813 xattr_mkdir fs/reiserfs/xattr.c:77 [inline] create_privroot fs/reiserfs/xattr.c:890 [inline] reiserfs_xattr_init+0x57e/0xbc0 fs/reiserfs/xattr.c:1006 reiserfs_fill_super+0x2129/0x2eb0 fs/reiserfs/super.c:2175 mount_bdev+0x358/0x420 fs/super.c:1380 legacy_get_tree+0x109/0x220 fs/fs_context.c:610 vfs_get_tree+0x8d/0x350 fs/super.c:1510 do_new_mount fs/namespace.c:3039 [inline] path_mount+0x134b/0x1e40 fs/namespace.c:3369 do_mount fs/namespace.c:3382 [inline] __do_sys_mount fs/namespace.c:3591 [inline] __se_sys_mount fs/namespace.c:3568 [inline] __ia32_sys_mount+0x282/0x300 fs/namespace.c:3568 do_syscall_32_irqs_on arch/x86/entry/common.c:112 [inline] __do_fast_syscall_32+0x65/0xf0 arch/x86/entry/common.c:178 do_fast_syscall_32+0x33/0x70 arch/x86/entry/common.c:203 entry_SYSENTER_compat_after_hwframe+0x70/0x82 Last potentially related work creation: kasan_save_stack+0x22/0x40 mm/kasan/common.c:45 __kasan_record_aux_stack+0xbc/0xd0 mm/kasan/generic.c:491 __call_rcu_common.constprop.0+0x99/0x7e0 kernel/rcu/tree.c:2627 destroy_inode+0x129/0x1b0 fs/inode.c:315 iput_final fs/inode.c:1747 [inline] iput.part.0+0x50a/0x740 fs/inode.c:1773 iput+0x5c/0x80 fs/inode.c:1763 reiserfs_new_inode+0x402/0x2110 fs/reiserfs/inode.c:2154 reiserfs_mkdir+0x4b8/0x990 fs/reiserfs/namei.c:843 xattr_mkdir fs/reiserfs/xattr.c:77 [inline] create_privroot fs/reiserfs/xattr.c:890 [inline] reiserfs_xattr_init+0x57e/0xbc0 fs/reiserfs/xattr.c:1006 reiserfs_fill_super+0x2129/0x2eb0 fs/reiserfs/super.c:2175 mount_bdev+0x358/0x420 fs/super.c:1380 legacy_get_tree+0x109/0x220 fs/fs_context.c:610 vfs_get_tree+0x8d/0x350 fs/super.c:1510 do_new_mount fs/namespace.c:3039 [inline] path_mount+0x134b/0x1e40 fs/namespace.c:3369 do_mount fs/namespace.c:3382 [inline] __do_sys_mount fs/namespace.c:3591 [inline] __se_sys_mount fs/namespace.c:3568 [inline] __ia32_sys_mount+0x282/0x300 fs/namespace.c:3568 do_syscall_32_irqs_on arch/x86/entry/common.c:112 [inline] __do_fast_syscall_32+0x65/0xf0 arch/x86/entry/common.c:178 do_fast_syscall_32+0x33/0x70 arch/x86/entry/common.c:203 entry_SYSENTER_compat_after_hwframe+0x70/0x82 The buggy address belongs to the object at ffff88805f1b06a0 which belongs to the cache reiser_inode_cache of size 1568 The buggy address is located 1488 bytes inside of freed 1568-byte region [ffff88805f1b06a0, ffff88805f1b0cc0) The buggy address belongs to the physical page: page:ffffea00017c6c00 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff88805f1b13e0 pfn:0x5f1b0 head:ffffea00017c6c00 order:3 entire_mapcount:0 nr_pages_mapped:0 pincount:0 memcg:ffff888042f00c01 flags: 0x4fff00000010200(slab|head|node=1|zone=1|lastcpupid=0x7ff) page_type: 0xffffffff() raw: 04fff00000010200 ffff888042d81040 dead000000000122 0000000000000000 raw: ffff88805f1b13e0 0000000080130011 00000001ffffffff ffff888042f00c01 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 3, migratetype Reclaimable, gfp_mask 0x1d20d0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL|__GFP_RECLAIMABLE), pid 5890, tgid 5888 (syz-executor.2), ts 111007407408, free_ts 0 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x2db/0x350 mm/page_alloc.c:1731 prep_new_page mm/page_alloc.c:1738 [inline] get_page_from_freelist+0xf41/0x2c00 mm/page_alloc.c:3502 __alloc_pages+0x1cb/0x4a0 mm/page_alloc.c:4768 alloc_pages+0x1aa/0x270 mm/mempolicy.c:2279 alloc_slab_page mm/slub.c:1851 [inline] allocate_slab+0x25f/0x390 mm/slub.c:1998 new_slab mm/slub.c:2051 [inline] ___slab_alloc+0xa91/0x1400 mm/slub.c:3192 __slab_alloc.constprop.0+0x56/0xa0 mm/slub.c:3291 __slab_alloc_node mm/slub.c:3344 [inline] slab_alloc_node mm/slub.c:3441 [inline] slab_alloc mm/slub.c:3459 [inline] __kmem_cache_alloc_lru mm/slub.c:3466 [inline] kmem_cache_alloc_lru+0x4a8/0x600 mm/slub.c:3482 alloc_inode_sb include/linux/fs.h:2705 [inline] reiserfs_alloc_inode+0x28/0xc0 fs/reiserfs/super.c:642 alloc_inode+0x61/0x230 fs/inode.c:260 iget5_locked fs/inode.c:1241 [inline] iget5_locked+0x1cf/0x2c0 fs/inode.c:1234 reiserfs_fill_super+0xf8c/0x2eb0 fs/reiserfs/super.c:2053 mount_bdev+0x358/0x420 fs/super.c:1380 legacy_get_tree+0x109/0x220 fs/fs_context.c:610 vfs_get_tree+0x8d/0x350 fs/super.c:1510 do_new_mount fs/namespace.c:3039 [inline] path_mount+0x134b/0x1e40 fs/namespace.c:3369 page_owner free stack trace missing Memory state around the buggy address: ffff88805f1b0b00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88805f1b0b80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88805f1b0c00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88805f1b0c80: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ffff88805f1b0d00: fc fc fc fc fc fc fc fc 00 00 00 00 00 00 00 00 ================================================================== ---------------- Code disassembly (best guess), 2 bytes skipped: 0: 10 06 adc %al,(%rsi) 2: 03 74 b4 01 add 0x1(%rsp,%rsi,4),%esi 6: 10 07 adc %al,(%rdi) 8: 03 74 b0 01 add 0x1(%rax,%rsi,4),%esi c: 10 08 adc %cl,(%rax) e: 03 74 d8 01 add 0x1(%rax,%rbx,8),%esi 1e: 00 51 52 add %dl,0x52(%rcx) 21: 55 push %rbp 22: 89 e5 mov %esp,%ebp 24: 0f 34 sysenter 26: cd 80 int $0x80 * 28: 5d pop %rbp <-- trapping instruction 29: 5a pop %rdx 2a: 59 pop %rcx 2b: c3 retq 2c: 90 nop 2d: 90 nop 2e: 90 nop 2f: 90 nop 30: 8d b4 26 00 00 00 00 lea 0x0(%rsi,%riz,1),%esi 37: 8d b4 26 00 00 00 00 lea 0x0(%rsi,%riz,1),%esi --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@xxxxxxxxxxxxxxxx. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. If the bug is already fixed, let syzbot know by replying with: #syz fix: exact-commit-title If you want to change bug's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) If the bug is a duplicate of another bug, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup
