syzbot

EXT4-fs (loop0): 1 truncate cleaned up
EXT4-fs (loop0): mounted filesystem 00000000-0000-0000-0000-000000000000 r/w without journal. Quota mode: writeback.
==================================================================
BUG: KASAN: out-of-bounds in ext4_xattr_set_entry+0x8e9/0x1e20 fs/ext4/xattr.c:1773
Read of size 18446744073709551572 at addr ffff88804034f050 by task syz.0.16/5494

CPU: 0 UID: 0 PID: 5494 Comm: syz.0.16 Not tainted 6.16.0-rc7-syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
Call Trace:
 <TASK>
 dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120
 print_address_description mm/kasan/report.c:378 [inline]
 print_report+0xca/0x230 mm/kasan/report.c:480
 kasan_report+0x118/0x150 mm/kasan/report.c:593
 check_region_inline mm/kasan/generic.c:-1 [inline]
 kasan_check_range+0x2b0/0x2c0 mm/kasan/generic.c:189
 __asan_memmove+0x29/0x70 mm/kasan/shadow.c:94
 ext4_xattr_set_entry+0x8e9/0x1e20 fs/ext4/xattr.c:1773
 ext4_xattr_block_set+0x872/0x2ac0 fs/ext4/xattr.c:2020
 ext4_xattr_move_to_block fs/ext4/xattr.c:2659 [inline]
 ext4_xattr_make_inode_space fs/ext4/xattr.c:2734 [inline]
 ext4_expand_extra_isize_ea+0x12d5/0x1ea0 fs/ext4/xattr.c:2822
 __ext4_expand_extra_isize+0x30d/0x400 fs/ext4/inode.c:6306
 ext4_try_to_expand_extra_isize fs/ext4/inode.c:6349 [inline]
 __ext4_mark_inode_dirty+0x46c/0x700 fs/ext4/inode.c:6427
 __ext4_unlink+0x631/0xab0 fs/ext4/namei.c:3280
 ext4_unlink+0x216/0x5d0 fs/ext4/namei.c:3310
 vfs_unlink+0x391/0x650 fs/namei.c:4595
 do_unlinkat+0x350/0x560 fs/namei.c:4659
 __do_sys_unlink fs/namei.c:4705 [inline]
 __se_sys_unlink fs/namei.c:4703 [inline]
 __x64_sys_unlink+0x47/0x50 fs/namei.c:4703
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f6a2838e9a9
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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffd7d90efb8 EFLAGS: 00000246 ORIG_RAX: 0000000000000057
RAX: ffffffffffffffda RBX: 00007f6a285b5fa0 RCX: 00007f6a2838e9a9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000200000000180
RBP: 00007f6a28410d69 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f6a285b5fa0 R14: 00007f6a285b5fa0 R15: 0000000000000001
 </TASK>

Allocated by task 5494:
 kasan_save_stack mm/kasan/common.c:47 [inline]
 kasan_save_track+0x3e/0x80 mm/kasan/common.c:68
 poison_kmalloc_redzone mm/kasan/common.c:377 [inline]
 __kasan_kmalloc+0x93/0xb0 mm/kasan/common.c:394
 kasan_kmalloc include/linux/kasan.h:260 [inline]
 __do_kmalloc_node mm/slub.c:4328 [inline]
 __kmalloc_node_track_caller_noprof+0x271/0x4e0 mm/slub.c:4347
 kmemdup_noprof+0x2b/0x70 mm/util.c:137
 kmemdup_noprof include/linux/fortify-string.h:765 [inline]
 ext4_xattr_block_set+0x781/0x2ac0 fs/ext4/xattr.c:1968
 ext4_xattr_move_to_block fs/ext4/xattr.c:2659 [inline]
 ext4_xattr_make_inode_space fs/ext4/xattr.c:2734 [inline]
 ext4_expand_extra_isize_ea+0x12d5/0x1ea0 fs/ext4/xattr.c:2822
 __ext4_expand_extra_isize+0x30d/0x400 fs/ext4/inode.c:6306
 ext4_try_to_expand_extra_isize fs/ext4/inode.c:6349 [inline]
 __ext4_mark_inode_dirty+0x46c/0x700 fs/ext4/inode.c:6427
 __ext4_unlink+0x631/0xab0 fs/ext4/namei.c:3280
 ext4_unlink+0x216/0x5d0 fs/ext4/namei.c:3310
 vfs_unlink+0x391/0x650 fs/namei.c:4595
 do_unlinkat+0x350/0x560 fs/namei.c:4659
 __do_sys_unlink fs/namei.c:4705 [inline]
 __se_sys_unlink fs/namei.c:4703 [inline]
 __x64_sys_unlink+0x47/0x50 fs/namei.c:4703
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

The buggy address belongs to the object at ffff88804034f000
 which belongs to the cache kmalloc-1k of size 1024
The buggy address is located 80 bytes inside of
 1024-byte region [ffff88804034f000, ffff88804034f400)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x4034c
head: order:2 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
flags: 0x4fff00000000040(head|node=1|zone=1|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 04fff00000000040 ffff88801a441dc0 ffffea0000fd5000 dead000000000004
raw: 0000000000000000 0000000080080008 00000000f5000000 0000000000000000
head: 04fff00000000040 ffff88801a441dc0 ffffea0000fd5000 dead000000000004
head: 0000000000000000 0000000080080008 00000000f5000000 0000000000000000
head: 04fff00000000002 ffffea000100d301 00000000ffffffff 00000000ffffffff
head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000004
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 2, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 1, tgid 1 (swapper/0), ts 29775688485, free_ts 29772010363
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0x240/0x2a0 mm/page_alloc.c:1704
 prep_new_page mm/page_alloc.c:1712 [inline]
 get_page_from_freelist+0x21e4/0x22c0 mm/page_alloc.c:3669
 __alloc_frozen_pages_noprof+0x181/0x370 mm/page_alloc.c:4959
 alloc_pages_mpol+0x232/0x4a0 mm/mempolicy.c:2419
 alloc_slab_page mm/slub.c:2451 [inline]
 allocate_slab+0x8a/0x3b0 mm/slub.c:2619
 new_slab mm/slub.c:2673 [inline]
 ___slab_alloc+0xbfc/0x1480 mm/slub.c:3859
 __slab_alloc mm/slub.c:3949 [inline]
 __slab_alloc_node mm/slub.c:4024 [inline]
 slab_alloc_node mm/slub.c:4185 [inline]
 __do_kmalloc_node mm/slub.c:4327 [inline]
 __kmalloc_noprof+0x305/0x4f0 mm/slub.c:4340
 kmalloc_noprof include/linux/slab.h:909 [inline]
 kmalloc_array_noprof include/linux/slab.h:948 [inline]
 ext4_mb_init+0x81d/0x2860 fs/ext4/mballoc.c:3659
 __ext4_fill_super fs/ext4/super.c:5554 [inline]
 ext4_fill_super+0x5231/0x6080 fs/ext4/super.c:5724
 get_tree_bdev_flags+0x40b/0x4d0 fs/super.c:1681
 vfs_get_tree+0x92/0x2b0 fs/super.c:1804
 do_new_mount+0x24a/0xa40 fs/namespace.c:3902
 init_mount+0xd1/0x120 fs/init.c:25
 do_mount_root+0x120/0x2b0 init/do_mounts.c:165
 mount_root_generic+0x1e0/0x440 init/do_mounts.c:204
 prepare_namespace+0xc2/0x100 init/do_mounts.c:491
page last free pid 1 tgid 1 stack trace:
 reset_page_owner include/linux/page_owner.h:25 [inline]
 free_pages_prepare mm/page_alloc.c:1248 [inline]
 __free_frozen_pages+0xc71/0xe70 mm/page_alloc.c:2706
 stack_depot_save_flags+0x445/0x900 lib/stackdepot.c:678
 kasan_save_stack mm/kasan/common.c:48 [inline]
 kasan_save_track+0x4f/0x80 mm/kasan/common.c:68
 poison_kmalloc_redzone mm/kasan/common.c:377 [inline]
 __kasan_kmalloc+0x93/0xb0 mm/kasan/common.c:394
 kasan_kmalloc include/linux/kasan.h:260 [inline]
 __do_kmalloc_node mm/slub.c:4328 [inline]
 __kmalloc_noprof+0x27a/0x4f0 mm/slub.c:4340
 kmalloc_noprof include/linux/slab.h:909 [inline]
 kzalloc_noprof include/linux/slab.h:1039 [inline]
 shrinker_alloc+0x199/0xa70 mm/shrinker.c:724
 mb_cache_create+0x32e/0x540 fs/mbcache.c:378
 __ext4_fill_super fs/ext4/super.c:5443 [inline]
 ext4_fill_super+0x4087/0x6080 fs/ext4/super.c:5724
 get_tree_bdev_flags+0x40b/0x4d0 fs/super.c:1681
 vfs_get_tree+0x92/0x2b0 fs/super.c:1804
 do_new_mount+0x24a/0xa40 fs/namespace.c:3902
 init_mount+0xd1/0x120 fs/init.c:25
 do_mount_root+0x120/0x2b0 init/do_mounts.c:165
 mount_root_generic+0x1e0/0x440 init/do_mounts.c:204
 prepare_namespace+0xc2/0x100 init/do_mounts.c:491
 kernel_init_freeable+0x41a/0x570 init/main.c:1597

Memory state around the buggy address:
 ffff88804034ef00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff88804034ef80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff88804034f000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
                                                 ^
 ffff88804034f080: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff88804034f100: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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