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.
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BUG: KASAN: out-of-bounds in ext4_xattr_set_entry+0x8e9/0x1e20 fs/ext4/xattr.c:1778
Read of size 18446744073709551572 at addr ffff888011d0d050 by task syz.0.17/5464

CPU: 0 UID: 0 PID: 5464 Comm: syz.0.17 Not tainted 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/0x240 mm/kasan/report.c:482
 kasan_report+0x118/0x150 mm/kasan/report.c:595
 check_region_inline mm/kasan/generic.c:-1 [inline]
 kasan_check_range+0x2b0/0x2c0 mm/kasan/generic.c:200
 __asan_memmove+0x29/0x70 mm/kasan/shadow.c:94
 ext4_xattr_set_entry+0x8e9/0x1e20 fs/ext4/xattr.c:1778
 ext4_xattr_block_set+0x872/0x2ac0 fs/ext4/xattr.c:2025
 ext4_xattr_move_to_block fs/ext4/xattr.c:2664 [inline]
 ext4_xattr_make_inode_space fs/ext4/xattr.c:2739 [inline]
 ext4_expand_extra_isize_ea+0x12da/0x1ea0 fs/ext4/xattr.c:2827
 __ext4_expand_extra_isize+0x30d/0x400 fs/ext4/inode.c:6364
 ext4_try_to_expand_extra_isize fs/ext4/inode.c:6407 [inline]
 __ext4_mark_inode_dirty+0x46c/0x700 fs/ext4/inode.c:6485
 __ext4_unlink+0x631/0xab0 fs/ext4/namei.c:3284
 ext4_unlink+0x216/0x5d0 fs/ext4/namei.c:3314
 vfs_unlink+0x394/0x650 fs/namei.c:4673
 do_unlinkat+0x345/0x560 fs/namei.c:4737
 __do_sys_unlink fs/namei.c:4783 [inline]
 __se_sys_unlink fs/namei.c:4781 [inline]
 __x64_sys_unlink+0x47/0x50 fs/namei.c:4781
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f55ceb8efc9
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:00007ffe9c0e7d38 EFLAGS: 00000246 ORIG_RAX: 0000000000000057
RAX: ffffffffffffffda RBX: 00007f55cede5fa0 RCX: 00007f55ceb8efc9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000200000000180
RBP: 00007f55cec11f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f55cede5fa0 R14: 00007f55cede5fa0 R15: 0000000000000001
 </TASK>

Allocated by task 5464:
 kasan_save_stack mm/kasan/common.c:56 [inline]
 kasan_save_track+0x3e/0x80 mm/kasan/common.c:77
 poison_kmalloc_redzone mm/kasan/common.c:400 [inline]
 __kasan_kmalloc+0x93/0xb0 mm/kasan/common.c:417
 kasan_kmalloc include/linux/kasan.h:262 [inline]
 __do_kmalloc_node mm/slub.c:5642 [inline]
 __kmalloc_node_track_caller_noprof+0x568/0x800 mm/slub.c:5751
 kmemdup_noprof+0x2b/0x70 mm/util.c:138
 kmemdup_noprof include/linux/fortify-string.h:765 [inline]
 ext4_xattr_block_set+0x781/0x2ac0 fs/ext4/xattr.c:1973
 ext4_xattr_move_to_block fs/ext4/xattr.c:2664 [inline]
 ext4_xattr_make_inode_space fs/ext4/xattr.c:2739 [inline]
 ext4_expand_extra_isize_ea+0x12da/0x1ea0 fs/ext4/xattr.c:2827
 __ext4_expand_extra_isize+0x30d/0x400 fs/ext4/inode.c:6364
 ext4_try_to_expand_extra_isize fs/ext4/inode.c:6407 [inline]
 __ext4_mark_inode_dirty+0x46c/0x700 fs/ext4/inode.c:6485
 __ext4_unlink+0x631/0xab0 fs/ext4/namei.c:3284
 ext4_unlink+0x216/0x5d0 fs/ext4/namei.c:3314
 vfs_unlink+0x394/0x650 fs/namei.c:4673
 do_unlinkat+0x345/0x560 fs/namei.c:4737
 __do_sys_unlink fs/namei.c:4783 [inline]
 __se_sys_unlink fs/namei.c:4781 [inline]
 __x64_sys_unlink+0x47/0x50 fs/namei.c:4781
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

The buggy address belongs to the object at ffff888011d0d000
 which belongs to the cache kmalloc-1k of size 1024
The buggy address is located 80 bytes inside of
 1024-byte region [ffff888011d0d000, ffff888011d0d400)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x11d0c
head: order:2 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
flags: 0xfff00000000040(head|node=0|zone=1|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 00fff00000000040 ffff88801a041dc0 dead000000000122 0000000000000000
raw: 0000000000000000 0000000080080008 00000000f5000000 0000000000000000
head: 00fff00000000040 ffff88801a041dc0 dead000000000122 0000000000000000
head: 0000000000000000 0000000080080008 00000000f5000000 0000000000000000
head: 00fff00000000002 ffffea0000474301 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 0x252800(GFP_NOWAIT|__GFP_NORETRY|__GFP_COMP|__GFP_THISNODE), pid 5464, tgid 5464 (syz.0.17), ts 99391437193, free_ts 91456122382
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0x240/0x2a0 mm/page_alloc.c:1850
 prep_new_page mm/page_alloc.c:1858 [inline]
 get_page_from_freelist+0x2365/0x2440 mm/page_alloc.c:3884
 __alloc_pages_slowpath+0x30b/0xcf0 mm/page_alloc.c:4714
 __alloc_frozen_pages_noprof+0x319/0x370 mm/page_alloc.c:5196
 alloc_slab_page mm/slub.c:3057 [inline]
 allocate_slab+0x71/0x350 mm/slub.c:3228
 new_slab mm/slub.c:3282 [inline]
 ___slab_alloc+0xe94/0x18a0 mm/slub.c:4651
 __slab_alloc+0x65/0x100 mm/slub.c:4770
 __slab_alloc_node mm/slub.c:4846 [inline]
 slab_alloc_node mm/slub.c:5268 [inline]
 __do_kmalloc_node mm/slub.c:5641 [inline]
 __kmalloc_node_noprof+0x5cc/0x800 mm/slub.c:5648
 kmalloc_array_node_noprof include/linux/slab.h:1075 [inline]
 alloc_slab_obj_exts+0x3e/0x100 mm/slub.c:2123
 __memcg_slab_post_alloc_hook+0x31d/0x7d0 mm/memcontrol.c:3173
 memcg_slab_post_alloc_hook mm/slub.c:2338 [inline]
 slab_post_alloc_hook mm/slub.c:4981 [inline]
 slab_alloc_node mm/slub.c:5280 [inline]
 __do_kmalloc_node mm/slub.c:5641 [inline]
 __kmalloc_node_track_caller_noprof+0x5e6/0x800 mm/slub.c:5751
 __kmemdup_nul mm/util.c:64 [inline]
 kstrdup+0x42/0x100 mm/util.c:84
 alloc_vfsmnt+0xeb/0x430 fs/namespace.c:311
 vfs_create_mount+0x69/0x320 fs/namespace.c:1193
 fc_mount fs/namespace.c:1211 [inline]
 do_new_mount_fc fs/namespace.c:3651 [inline]
 do_new_mount+0x390/0xa10 fs/namespace.c:3727
 do_mount fs/namespace.c:4050 [inline]
 __do_sys_mount fs/namespace.c:4238 [inline]
 __se_sys_mount+0x313/0x410 fs/namespace.c:4215
page last free pid 3060 tgid 3060 stack trace:
 reset_page_owner include/linux/page_owner.h:25 [inline]
 free_pages_prepare mm/page_alloc.c:1394 [inline]
 __free_frozen_pages+0xbc4/0xd30 mm/page_alloc.c:2906
 free_large_kmalloc+0x13a/0x1f0 mm/slub.c:6763
 build_detached_freelist+0x22a/0x270 mm/slub.c:7255
 kmem_cache_free_bulk+0x8ec/0xdb0 mm/slub.c:7342
 kfree_bulk include/linux/slab.h:830 [inline]
 kvfree_rcu_bulk+0xe5/0x1f0 mm/slab_common.c:1522
 kvfree_rcu_drain_ready mm/slab_common.c:1729 [inline]
 kfree_rcu_monitor+0x211/0x2a0 mm/slab_common.c:1802
 process_one_work kernel/workqueue.c:3263 [inline]
 process_scheduled_works+0xae1/0x17b0 kernel/workqueue.c:3346
 worker_thread+0x8a0/0xda0 kernel/workqueue.c:3427
 kthread+0x711/0x8a0 kernel/kthread.c:463
 ret_from_fork+0x4bc/0x870 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

Memory state around the buggy address:
 ffff888011d0cf00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff888011d0cf80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff888011d0d000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
                                                 ^
 ffff888011d0d080: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff888011d0d100: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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