syzbot

loop0: detected capacity change from 0 to 32768
=======================================================
WARNING: The mand mount option has been deprecated and
         and is ignored by this kernel. Remove the mand
         option from the mount to silence this warning.
=======================================================
XFS (loop0): Mounting V5 Filesystem bfdc47fc-10d8-4eed-a562-11a831b3f791
==================================================================
BUG: KASAN: slab-out-of-bounds in crc32c_le_arch+0xc7/0x1b0 arch/x86/lib/crc32-glue.c:81
Read of size 8 at addr ffff88801ce46a00 by task syz.0.0/5315

CPU: 0 UID: 0 PID: 5315 Comm: syz.0.0 Not tainted 6.13.0-syzkaller-05182-ge0b1f5914274 #0
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 lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120
 print_address_description mm/kasan/report.c:378 [inline]
 print_report+0x169/0x550 mm/kasan/report.c:489
 kasan_report+0x143/0x180 mm/kasan/report.c:602
 crc32c_le_arch+0xc7/0x1b0 arch/x86/lib/crc32-glue.c:81
 __crc32c_le include/linux/crc32.h:36 [inline]
 crc32c include/linux/crc32c.h:9 [inline]
 xlog_cksum+0x91/0xf0 fs/xfs/xfs_log.c:1588
 xlog_recover_process+0x78/0x1e0 fs/xfs/xfs_log_recover.c:2900
 xlog_do_recovery_pass+0xa01/0xdc0 fs/xfs/xfs_log_recover.c:3235
 xlog_verify_head+0x21f/0x5a0 fs/xfs/xfs_log_recover.c:1058
 xlog_find_tail+0xa04/0xdf0 fs/xfs/xfs_log_recover.c:1315
 xlog_recover+0xe1/0x540 fs/xfs/xfs_log_recover.c:3419
 xfs_log_mount+0x252/0x3e0 fs/xfs/xfs_log.c:666
 xfs_mountfs+0xfb2/0x24e0 fs/xfs/xfs_mount.c:881
 xfs_fs_fill_super+0x121d/0x1540 fs/xfs/xfs_super.c:1813
 get_tree_bdev_flags+0x48c/0x5c0 fs/super.c:1636
 vfs_get_tree+0x90/0x2b0 fs/super.c:1814
 do_new_mount+0x2be/0xb40 fs/namespace.c:3560
 do_mount fs/namespace.c:3900 [inline]
 __do_sys_mount fs/namespace.c:4111 [inline]
 __se_sys_mount+0x2d6/0x3c0 fs/namespace.c:4088
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f903c98e4ca
Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb a6 e8 de 1a 00 00 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 49 89 ca b8 a5 00 00 00 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:00007f903d8a6e68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f903d8a6ef0 RCX: 00007f903c98e4ca
RDX: 0000000020000500 RSI: 0000000020000200 RDI: 00007f903d8a6eb0
RBP: 0000000020000500 R08: 00007f903d8a6ef0 R09: 0000000002218a5d
R10: 0000000002218a5d R11: 0000000000000246 R12: 0000000020000200
R13: 00007f903d8a6eb0 R14: 0000000000009706 R15: 0000000020000100
 </TASK>

Allocated by task 5315:
 kasan_save_stack mm/kasan/common.c:47 [inline]
 kasan_save_track+0x3f/0x80 mm/kasan/common.c:68
 poison_kmalloc_redzone mm/kasan/common.c:377 [inline]
 __kasan_kmalloc+0x98/0xb0 mm/kasan/common.c:394
 kasan_kmalloc include/linux/kasan.h:260 [inline]
 __do_kmalloc_node mm/slub.c:4298 [inline]
 __kmalloc_node_noprof+0x290/0x4d0 mm/slub.c:4304
 __kvmalloc_node_noprof+0x72/0x190 mm/util.c:645
 xlog_do_recovery_pass+0x143/0xdc0 fs/xfs/xfs_log_recover.c:3016
 xlog_verify_head+0x21f/0x5a0 fs/xfs/xfs_log_recover.c:1058
 xlog_find_tail+0xa04/0xdf0 fs/xfs/xfs_log_recover.c:1315
 xlog_recover+0xe1/0x540 fs/xfs/xfs_log_recover.c:3419
 xfs_log_mount+0x252/0x3e0 fs/xfs/xfs_log.c:666
 xfs_mountfs+0xfb2/0x24e0 fs/xfs/xfs_mount.c:881
 xfs_fs_fill_super+0x121d/0x1540 fs/xfs/xfs_super.c:1813
 get_tree_bdev_flags+0x48c/0x5c0 fs/super.c:1636
 vfs_get_tree+0x90/0x2b0 fs/super.c:1814
 do_new_mount+0x2be/0xb40 fs/namespace.c:3560
 do_mount fs/namespace.c:3900 [inline]
 __do_sys_mount fs/namespace.c:4111 [inline]
 __se_sys_mount+0x2d6/0x3c0 fs/namespace.c:4088
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

The buggy address belongs to the object at ffff88801ce46800
 which belongs to the cache kmalloc-512 of size 512
The buggy address is located 0 bytes to the right of
 allocated 512-byte region [ffff88801ce46800, ffff88801ce46a00)

The buggy address belongs to the physical page:
page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1ce46
head: order:1 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
ksm flags: 0xfff00000000040(head|node=0|zone=1|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 00fff00000000040 ffff88801ac41c80 ffffea0000476880 dead000000000003
raw: 0000000000000000 0000000080080008 00000001f5000000 0000000000000000
head: 00fff00000000040 ffff88801ac41c80 ffffea0000476880 dead000000000003
head: 0000000000000000 0000000080080008 00000001f5000000 0000000000000000
head: 00fff00000000001 ffffea0000739181 ffffffffffffffff 0000000000000000
head: 0000000000000002 0000000000000000 00000000ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 1, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 4724, tgid 4724 (udevadm), ts 22594595363, free_ts 22527506750
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0x1f3/0x230 mm/page_alloc.c:1558
 prep_new_page mm/page_alloc.c:1566 [inline]
 get_page_from_freelist+0x365c/0x37a0 mm/page_alloc.c:3476
 __alloc_pages_noprof+0x292/0x710 mm/page_alloc.c:4753
 alloc_pages_mpol_noprof+0x3e1/0x780 mm/mempolicy.c:2269
 alloc_slab_page+0x6a/0x110 mm/slub.c:2423
 allocate_slab+0x5a/0x2b0 mm/slub.c:2589
 new_slab mm/slub.c:2642 [inline]
 ___slab_alloc+0xc27/0x14a0 mm/slub.c:3830
 __slab_alloc+0x58/0xa0 mm/slub.c:3920
 __slab_alloc_node mm/slub.c:3995 [inline]
 slab_alloc_node mm/slub.c:4156 [inline]
 __kmalloc_cache_noprof+0x27b/0x390 mm/slub.c:4324
 kmalloc_noprof include/linux/slab.h:901 [inline]
 kzalloc_noprof include/linux/slab.h:1037 [inline]
 kernfs_fop_open+0x3e0/0xd10 fs/kernfs/file.c:623
 do_dentry_open+0xdec/0x1960 fs/open.c:955
 vfs_open+0x3b/0x370 fs/open.c:1085
 do_open fs/namei.c:3828 [inline]
 path_openat+0x2c74/0x3580 fs/namei.c:3987
 do_filp_open+0x27f/0x4e0 fs/namei.c:4014
 do_sys_openat2+0x13e/0x1d0 fs/open.c:1427
 do_sys_open fs/open.c:1442 [inline]
 __do_sys_openat fs/open.c:1458 [inline]
 __se_sys_openat fs/open.c:1453 [inline]
 __x64_sys_openat+0x247/0x2a0 fs/open.c:1453
page last free pid 4724 tgid 4724 stack trace:
 reset_page_owner include/linux/page_owner.h:25 [inline]
 free_pages_prepare mm/page_alloc.c:1127 [inline]
 free_unref_page+0xd3f/0x1010 mm/page_alloc.c:2659
 __slab_free+0x2c2/0x380 mm/slub.c:4524
 qlink_free mm/kasan/quarantine.c:163 [inline]
 qlist_free_all+0x9a/0x140 mm/kasan/quarantine.c:179
 kasan_quarantine_reduce+0x14f/0x170 mm/kasan/quarantine.c:286
 __kasan_slab_alloc+0x23/0x80 mm/kasan/common.c:329
 kasan_slab_alloc include/linux/kasan.h:250 [inline]
 slab_post_alloc_hook mm/slub.c:4119 [inline]
 slab_alloc_node mm/slub.c:4168 [inline]
 kmem_cache_alloc_noprof+0x1d9/0x380 mm/slub.c:4175
 getname_flags+0xb7/0x540 fs/namei.c:139
 do_readlinkat+0xd8/0x3a0 fs/stat.c:561
 __do_sys_readlink fs/stat.c:599 [inline]
 __se_sys_readlink fs/stat.c:596 [inline]
 __x64_sys_readlink+0x7f/0x90 fs/stat.c:596
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Memory state around the buggy address:
 ffff88801ce46900: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff88801ce46980: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff88801ce46a00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
                   ^
 ffff88801ce46a80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff88801ce46b00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
==================================================================