syz-executor.4 (13808): drop_caches: 2
==================================================================
BUG: KASAN: stack-out-of-bounds in __lock_acquire+0x77/0x1fd0 kernel/locking/lockdep.c:5005
Read of size 8 at addr ffffc9000fdc7898 by task syz-executor.4/13808

CPU: 0 PID: 13808 Comm: syz-executor.4 Not tainted 6.8.0-syzkaller-00974-g86833aec4479 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/29/2024
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x1e7/0x2e0 lib/dump_stack.c:106
 print_address_description mm/kasan/report.c:377 [inline]
 print_report+0x167/0x540 mm/kasan/report.c:488
 kasan_report+0x142/0x180 mm/kasan/report.c:601
 __lock_acquire+0x77/0x1fd0 kernel/locking/lockdep.c:5005
 lock_acquire+0x1e3/0x530 kernel/locking/lockdep.c:5754
 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
 _raw_spin_lock_irqsave+0xd5/0x120 kernel/locking/spinlock.c:162
 down+0x39/0xc0 kernel/locking/semaphore.c:59
 xfs_buf_lock+0x154/0x4c0 fs/xfs/xfs_buf.c:1126
 xfs_buf_delwri_submit_buffers+0x149/0x950 fs/xfs/xfs_buf.c:2210
 xfs_buf_delwri_submit+0xba/0x270 fs/xfs/xfs_buf.c:2288
 xfs_qm_shrink_scan+0x1ee/0x400 fs/xfs/xfs_qm.c:521
 do_shrink_slab+0x6d0/0x1140 mm/shrinker.c:435
 shrink_slab+0x1092/0x14d0 mm/shrinker.c:662
 drop_slab_node mm/vmscan.c:387 [inline]
 drop_slab+0x148/0x290 mm/vmscan.c:405
 drop_caches_sysctl_handler+0xbc/0x160 fs/drop_caches.c:68
 proc_sys_call_handler+0x550/0x8b0 fs/proc/proc_sysctl.c:595
 do_iter_readv_writev+0x5a3/0x7f0
 vfs_writev+0x395/0xbb0 fs/read_write.c:971
 do_writev+0x1b1/0x350 fs/read_write.c:1018
 do_syscall_64+0xf9/0x240
 entry_SYSCALL_64_after_hwframe+0x6f/0x77
RIP: 0033:0x7f861e27dda9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 00 00 90 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 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f861ef990c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000014
RAX: ffffffffffffffda RBX: 00007f861e3ac120 RCX: 00007f861e27dda9
RDX: 0000000000000001 RSI: 00000000200000c0 RDI: 0000000000000004
RBP: 00007f861e2ca47a R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000000b R14: 00007f861e3ac120 R15: 00007ffdf143c758
 </TASK>

The buggy address belongs to the virtual mapping at
 [ffffc9000fdc0000, ffffc9000fdc9000) created by:
 copy_process+0x5d0/0x3dc0 kernel/fork.c:2219

The buggy address belongs to the physical page:
page:ffffea0001f80740 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x7e01d
memcg:ffff888015ff1682
flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
page_type: 0xffffffff()
raw: 00fff00000000000 0000000000000000 dead000000000122 0000000000000000
raw: 0000000000000000 0000000000000000 00000001ffffffff ffff888015ff1682
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 13767, tgid 13767 (syz-executor.1), ts 1856974575661, free_ts 1856341656502
 set_page_owner include/linux/page_owner.h:31 [inline]
 post_alloc_hook+0x1ea/0x210 mm/page_alloc.c:1533
 prep_new_page mm/page_alloc.c:1540 [inline]
 get_page_from_freelist+0x33ea/0x3580 mm/page_alloc.c:3311
 __alloc_pages+0x255/0x680 mm/page_alloc.c:4569
 alloc_pages_mpol+0x3de/0x650 mm/mempolicy.c:2133
 vm_area_alloc_pages mm/vmalloc.c:3063 [inline]
 __vmalloc_area_node mm/vmalloc.c:3139 [inline]
 __vmalloc_node_range+0x9a3/0x14a0 mm/vmalloc.c:3320
 alloc_thread_stack_node kernel/fork.c:309 [inline]
 dup_task_struct+0x3e9/0x7d0 kernel/fork.c:1114
 copy_process+0x5d0/0x3dc0 kernel/fork.c:2219
 kernel_clone+0x222/0x840 kernel/fork.c:2796
 __do_sys_clone3 kernel/fork.c:3097 [inline]
 __se_sys_clone3+0x2cb/0x350 kernel/fork.c:3081
 do_syscall_64+0xf9/0x240
 entry_SYSCALL_64_after_hwframe+0x6f/0x77
page last free pid 5137 tgid 5137 stack trace:
 reset_page_owner include/linux/page_owner.h:24 [inline]
 free_pages_prepare mm/page_alloc.c:1140 [inline]
 free_unref_page_prepare+0x95d/0xa80 mm/page_alloc.c:2346
 free_unref_page+0x37/0x3f0 mm/page_alloc.c:2486
 vfree+0x186/0x2e0 mm/vmalloc.c:2842
 delayed_vfree_work+0x56/0x80 mm/vmalloc.c:2763
 process_one_work kernel/workqueue.c:3254 [inline]
 process_scheduled_works+0x9ff/0x1770 kernel/workqueue.c:3335
 worker_thread+0x86c/0xd70 kernel/workqueue.c:3416
 kthread+0x2ef/0x390 kernel/kthread.c:388
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1b/0x30 arch/x86/entry/entry_64.S:243

Memory state around the buggy address:
 ffffc9000fdc7780: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffffc9000fdc7800: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffffc9000fdc7880: f3 f3 f3 f3 f3 f3 f3 f3 00 00 00 00 00 00 00 00
                            ^
 ffffc9000fdc7900: 00 00 00 00 00 00 00 00 00 00 00 00 f1 f1 f1 f1
 ffffc9000fdc7980: 00 00 f3 f3 00 00 00 00 00 00 00 00 00 00 00 00
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