[syzbot] [xfs?] KASAN: slab-use-after-free Read in xfs_inode_item_push

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: 707081b61156 Merge branch 'for-next/core', remote-tracking..
git tree: git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci
console output: https://syzkaller.appspot.com/x/log.txt?x=168b2fe3180000
kernel config: https://syzkaller.appspot.com/x/.config?x=caeac3f3565b057a
dashboard link: https://syzkaller.appspot.com/bug?extid=1a28995e12fd13faa44e
compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
userspace arch: arm64

Unfortunately, I don't have any reproducer for this issue yet.

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/6cad68bf7532/disk-707081b6.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/1a27e5400778/vmlinux-707081b6.xz
kernel image: https://storage.googleapis.com/syzbot-assets/67dfc53755d0/Image-707081b6.gz.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+1a2899...@syzkaller.appspotmail.com

==================================================================
BUG: KASAN: slab-use-after-free in xfs_inode_item_push+0x248/0x290 fs/xfs/xfs_inode_item.c:743
Read of size 8 at addr ffff0000ddfe0bb8 by task xfsaild/loop0/7856

CPU: 0 PID: 7856 Comm: xfsaild/loop0 Not tainted 6.8.0-rc7-syzkaller-g707081b61156 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
Call trace:
dump_backtrace+0x1b8/0x1e4 arch/arm64/kernel/stacktrace.c:291
show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:298
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0xd0/0x124 lib/dump_stack.c:106
print_address_description mm/kasan/report.c:377 [inline]
print_report+0x178/0x518 mm/kasan/report.c:488
kasan_report+0xd8/0x138 mm/kasan/report.c:601
__asan_report_load8_noabort+0x20/0x2c mm/kasan/report_generic.c:381
xfs_inode_item_push+0x248/0x290 fs/xfs/xfs_inode_item.c:743
xfsaild_push_item fs/xfs/xfs_trans_ail.c:414 [inline]
xfsaild_push fs/xfs/xfs_trans_ail.c:486 [inline]
xfsaild+0xbe8/0x2c18 fs/xfs/xfs_trans_ail.c:671
kthread+0x288/0x310 kernel/kthread.c:388
ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:860

Allocated by task 7816:
kasan_save_stack mm/kasan/common.c:47 [inline]
kasan_save_track+0x40/0x78 mm/kasan/common.c:68
kasan_save_alloc_info+0x40/0x50 mm/kasan/generic.c:575
unpoison_slab_object mm/kasan/common.c:312 [inline]
__kasan_slab_alloc+0x74/0x8c mm/kasan/common.c:338
kasan_slab_alloc include/linux/kasan.h:201 [inline]
slab_post_alloc_hook mm/slub.c:3813 [inline]
slab_alloc_node mm/slub.c:3860 [inline]
kmem_cache_alloc+0x1dc/0x488 mm/slub.c:3867
kmem_cache_zalloc include/linux/slab.h:701 [inline]
xfs_inode_item_init+0x3c/0xc0 fs/xfs/xfs_inode_item.c:838
xfs_trans_ijoin+0xd8/0x114 fs/xfs/libxfs/xfs_trans_inode.c:36
xfs_create+0x8a4/0xf9c fs/xfs/xfs_inode.c:1040
xfs_generic_create+0x3c8/0xb10 fs/xfs/xfs_iops.c:199
xfs_vn_create+0x44/0x58 fs/xfs/xfs_iops.c:275
lookup_open fs/namei.c:3500 [inline]
open_last_lookups fs/namei.c:3569 [inline]
path_openat+0xfb4/0x2830 fs/namei.c:3799
do_filp_open+0x1bc/0x3cc fs/namei.c:3829
do_sys_openat2+0x124/0x1b8 fs/open.c:1404
do_sys_open fs/open.c:1419 [inline]
__do_sys_openat fs/open.c:1435 [inline]
__se_sys_openat fs/open.c:1430 [inline]
__arm64_sys_openat+0x1f0/0x240 fs/open.c:1430
__invoke_syscall arch/arm64/kernel/syscall.c:34 [inline]
invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:48
el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:133
do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:152
el0_svc+0x54/0x168 arch/arm64/kernel/entry-common.c:712
el0t_64_sync_handler+0x84/0xfc arch/arm64/kernel/entry-common.c:730
el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:598

Freed by task 22:
kasan_save_stack mm/kasan/common.c:47 [inline]
kasan_save_track+0x40/0x78 mm/kasan/common.c:68
kasan_save_free_info+0x54/0x6c mm/kasan/generic.c:589
poison_slab_object+0x124/0x18c mm/kasan/common.c:240
__kasan_slab_free+0x3c/0x70 mm/kasan/common.c:256
kasan_slab_free include/linux/kasan.h:184 [inline]
slab_free_hook mm/slub.c:2121 [inline]
slab_free mm/slub.c:4299 [inline]
kmem_cache_free+0x15c/0x3d4 mm/slub.c:4363
xfs_inode_item_destroy+0x80/0x94 fs/xfs/xfs_inode_item.c:860
xfs_inode_free_callback+0x154/0x1cc fs/xfs/xfs_icache.c:145
rcu_do_batch kernel/rcu/tree.c:2190 [inline]
rcu_core+0x890/0x1b34 kernel/rcu/tree.c:2465
rcu_core_si+0x10/0x1c kernel/rcu/tree.c:2482
__do_softirq+0x2d8/0xce4 kernel/softirq.c:553

The buggy address belongs to the object at ffff0000ddfe0b88
which belongs to the cache xfs_ili of size 264
The buggy address is located 48 bytes inside of
freed 264-byte region [ffff0000ddfe0b88, ffff0000ddfe0c90)

The buggy address belongs to the physical page:
page:00000000b7c34688 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff0000ddfe0668 pfn:0x11dfe0
flags: 0x5ffc00000000800(slab|node=0|zone=2|lastcpupid=0x7ff)
page_type: 0xffffffff()
raw: 05ffc00000000800 ffff0000c559d140 dead000000000122 0000000000000000
raw: ffff0000ddfe0668 00000000800c0004 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
ffff0000ddfe0a80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
ffff0000ddfe0b00: 00 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc
>ffff0000ddfe0b80: fc fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff0000ddfe0c00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff0000ddfe0c80: fb fb fc fc fc fc fc fc fc fc fa fb fb fb fb fb
==================================================================


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