BUG: spinlock recursion on CPU#1, syz.4.24/5401
==================================================================
BUG: KASAN: stack-out-of-bounds in vsnprintf+0x10ec/0x1da0 lib/vsprintf.c:2824
Read of size 8 at addr ffffc90004a3e4f8 by task syz.4.24/5401

CPU: 1 UID: 0 PID: 5401 Comm: syz.4.24 Not tainted 6.11.0-rc4-next-20240822-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024
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:377 [inline]
 print_report+0x169/0x550 mm/kasan/report.c:488
 kasan_report+0x143/0x180 mm/kasan/report.c:601
 vsnprintf+0x10ec/0x1da0 lib/vsprintf.c:2824
 vprintk_store+0x480/0x1160 kernel/printk/printk.c:2255
 vprintk_emit+0x39b/0xa10 kernel/printk/printk.c:2378
 _printk+0xd5/0x120 kernel/printk/printk.c:2424
 panic+0x2e0/0x880 kernel/panic.c:348
 __stack_chk_fail+0x15/0x20 kernel/panic.c:836
 search_extable+0xf6/0x100
 search_kernel_exception_table kernel/extable.c:49 [inline]
 search_exception_tables+0x3a/0x60 kernel/extable.c:58
 </TASK>

The buggy address belongs to stack of task syz.4.24/5401
 and is located at offset 248 in frame:
 vprintk_emit+0x0/0xa10

This frame has 3 objects:
 [32, 40) 'flags.i.i.i148.i'
 [64, 72) 'flags.i.i.i147.i'
 [96, 104) 'flags.i.i.i.i'

The buggy address belongs to the virtual mapping at
 [ffffc90004a38000, ffffc90004a41000) created by:
 copy_process+0x5d1/0x3d50 kernel/fork.c:2203

The buggy address belongs to the physical page:
page: refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff88807b0d51b0 pfn:0x7b0d5
memcg:ffff88802dd2e182
flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000000000 0000000000000000 dead000000000122 0000000000000000
raw: ffff88807b0d51b0 0000000000000000 00000001ffffffff ffff88802dd2e182
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Unmovable, gfp_mask 0x102dc2(GFP_HIGHUSER|__GFP_NOWARN|__GFP_ZERO), pid 5372, tgid 5372 (syz.3.16), ts 88886915827, free_ts 88885434496
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0x1f3/0x230 mm/page_alloc.c:1517
 prep_new_page mm/page_alloc.c:1525 [inline]
 get_page_from_freelist+0x3131/0x3280 mm/page_alloc.c:3476
 __alloc_pages_noprof+0x29e/0x780 mm/page_alloc.c:4743
 alloc_pages_mpol_noprof+0x3e8/0x680 mm/mempolicy.c:2265
 vm_area_alloc_pages mm/vmalloc.c:3600 [inline]
 __vmalloc_area_node mm/vmalloc.c:3669 [inline]
 __vmalloc_node_range_noprof+0xa40/0x1400 mm/vmalloc.c:3850
 alloc_thread_stack_node kernel/fork.c:314 [inline]
 dup_task_struct+0x444/0x8c0 kernel/fork.c:1115
 copy_process+0x5d1/0x3d50 kernel/fork.c:2203
 kernel_clone+0x226/0x8f0 kernel/fork.c:2784
 __do_sys_clone3 kernel/fork.c:3088 [inline]
 __se_sys_clone3+0x2cb/0x350 kernel/fork.c:3067
 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
page last free pid 4683 tgid 4683 stack trace:
 reset_page_owner include/linux/page_owner.h:25 [inline]
 free_pages_prepare mm/page_alloc.c:1098 [inline]
 free_unref_page+0xc07/0xd90 mm/page_alloc.c:2651
 discard_slab mm/slub.c:2630 [inline]
 __put_partials+0xeb/0x130 mm/slub.c:3098
 put_cpu_partial+0x17c/0x250 mm/slub.c:3173
 __slab_free+0x2ea/0x3d0 mm/slub.c:4391
 qlink_free mm/kasan/quarantine.c:163 [inline]
 qlist_free_all+0x9e/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:4036 [inline]
 slab_alloc_node mm/slub.c:4085 [inline]
 __do_kmalloc_node mm/slub.c:4205 [inline]
 __kmalloc_noprof+0x1a6/0x400 mm/slub.c:4218
 kmalloc_noprof include/linux/slab.h:685 [inline]
 tomoyo_realpath_from_path+0xcf/0x5e0 security/tomoyo/realpath.c:251
 tomoyo_get_realpath security/tomoyo/file.c:151 [inline]
 tomoyo_path_perm+0x2b7/0x740 security/tomoyo/file.c:822
 security_inode_getattr+0x130/0x330 security/security.c:2400
 vfs_getattr+0x45/0x430 fs/stat.c:242
 vfs_fstat fs/stat.c:267 [inline]
 vfs_fstatat+0xe4/0x190 fs/stat.c:376
 __do_sys_newfstatat fs/stat.c:543 [inline]
 __se_sys_newfstatat fs/stat.c:537 [inline]
 __x64_sys_newfstatat+0x11d/0x1a0 fs/stat.c:537
 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:
 ffffc90004a3e380: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffffc90004a3e400: f1 f1 f1 f1 00 f2 f2 f2 00 f2 f2 f2 00 f3 f3 f3
>ffffc90004a3e480: 00 f2 f2 f2 00 00 00 f2 f2 f2 f2 f2 04 f3 f3 f3
                                                                ^
 ffffc90004a3e500: 00 00 00 00 f1 f1 f1 f1 00 00 00 f3 f3 f3 f3 f3
 ffffc90004a3e580: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
==================================================================