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BUG: KASAN: stack-out-of-bounds in __lock_acquire+0x77/0x2040 kernel/locking/lockdep.c:5007
Read of size 8 at addr ffffc9000479f898 by task syz.3.46/5513

CPU: 1 UID: 0 PID: 5513 Comm: syz.3.46 Not tainted 6.11.0-rc4-syzkaller-00033-g872cf28b8df9 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:93 [inline]
 dump_stack_lvl+0x241/0x360 lib/dump_stack.c:119
 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
 __lock_acquire+0x77/0x2040 kernel/locking/lockdep.c:5007
 lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5759
 __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+0x164/0x510 fs/xfs/xfs_buf.c:1196
 xfs_buf_delwri_submit_buffers+0x149/0x980 fs/xfs/xfs_buf.c:2293
 xfs_buf_delwri_submit+0xba/0x270 fs/xfs/xfs_buf.c:2371
 xfs_qm_shrink_scan+0x1ee/0x400 fs/xfs/xfs_qm.c:522
 do_shrink_slab+0x701/0x1160 mm/shrinker.c:435
 shrink_slab+0x1093/0x14d0 mm/shrinker.c:662
 drop_slab_node mm/vmscan.c:413 [inline]
 drop_slab+0x142/0x280 mm/vmscan.c:431
 drop_caches_sysctl_handler+0xbc/0x160 fs/drop_caches.c:68
 proc_sys_call_handler+0x551/0x8b0 fs/proc/proc_sysctl.c:590
 iter_file_splice_write+0xbd7/0x14e0 fs/splice.c:743
 do_splice_from fs/splice.c:941 [inline]
 direct_splice_actor+0x11e/0x220 fs/splice.c:1164
 splice_direct_to_actor+0x58e/0xc90 fs/splice.c:1108
 do_splice_direct_actor fs/splice.c:1207 [inline]
 do_splice_direct+0x28c/0x3e0 fs/splice.c:1233
 do_sendfile+0x56d/0xe20 fs/read_write.c:1295
 __do_sys_sendfile64 fs/read_write.c:1356 [inline]
 __se_sys_sendfile64+0x100/0x1e0 fs/read_write.c:1348
 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: 0033:0x7f5b42379e79
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:00007f5b430ac038 EFLAGS: 00000246 ORIG_RAX: 0000000000000028
RAX: ffffffffffffffda RBX: 00007f5b42515f80 RCX: 00007f5b42379e79
RDX: 0000000020002080 RSI: 0000000000000003 RDI: 0000000000000004
RBP: 00007f5b423e7916 R08: 0000000000000000 R09: 0000000000000000
R10: 000000000000023b R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f5b42515f80 R15: 00007fff0be17168
 </TASK>

The buggy address belongs to the virtual mapping at
 [ffffc90004798000, ffffc900047a1000) created by:
 copy_process+0x5d1/0x3e10 kernel/fork.c:2217

The buggy address belongs to the physical page:
page: refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff888012507140 pfn:0x12507
memcg:ffff88802913c202
flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000000000 0000000000000000 dead000000000122 0000000000000000
raw: ffff888012507140 0000000000000000 00000001ffffffff ffff88802913c202
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 2, tgid 2 (kthreadd), ts 69110714784, free_ts 68947328922
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0x1f3/0x230 mm/page_alloc.c:1493
 prep_new_page mm/page_alloc.c:1501 [inline]
 get_page_from_freelist+0x2e4c/0x2f10 mm/page_alloc.c:3439
 __alloc_pages_noprof+0x256/0x6c0 mm/page_alloc.c:4695
 alloc_pages_mpol_noprof+0x3e8/0x680 mm/mempolicy.c:2263
 vm_area_alloc_pages mm/vmalloc.c:3584 [inline]
 __vmalloc_area_node mm/vmalloc.c:3653 [inline]
 __vmalloc_node_range_noprof+0xa40/0x1400 mm/vmalloc.c:3834
 alloc_thread_stack_node kernel/fork.c:313 [inline]
 dup_task_struct+0x444/0x8c0 kernel/fork.c:1113
 copy_process+0x5d1/0x3e10 kernel/fork.c:2217
 kernel_clone+0x223/0x880 kernel/fork.c:2800
 kernel_thread+0x1bc/0x240 kernel/fork.c:2862
 create_kthread kernel/kthread.c:412 [inline]
 kthreadd+0x60d/0x810 kernel/kthread.c:765
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
page last free pid 5392 tgid 5391 stack trace:
 reset_page_owner include/linux/page_owner.h:25 [inline]
 free_pages_prepare mm/page_alloc.c:1094 [inline]
 free_unref_folios+0x100f/0x1ac0 mm/page_alloc.c:2660
 folios_put_refs+0x76e/0x860 mm/swap.c:1039
 free_pages_and_swap_cache+0x5c8/0x690 mm/swap_state.c:335
 __tlb_batch_free_encoded_pages mm/mmu_gather.c:136 [inline]
 tlb_batch_pages_flush mm/mmu_gather.c:149 [inline]
 tlb_flush_mmu_free mm/mmu_gather.c:366 [inline]
 tlb_flush_mmu+0x3a3/0x680 mm/mmu_gather.c:373
 tlb_finish_mmu+0xd4/0x200 mm/mmu_gather.c:465
 unmap_region+0x2df/0x350 mm/mmap.c:2441
 do_vmi_align_munmap+0x1122/0x18c0 mm/mmap.c:2754
 do_vmi_munmap+0x261/0x2f0 mm/mmap.c:2830
 __vm_munmap+0x1fc/0x400 mm/mmap.c:3109
 __do_sys_munmap mm/mmap.c:3126 [inline]
 __se_sys_munmap mm/mmap.c:3123 [inline]
 __x64_sys_munmap+0x68/0x80 mm/mmap.c:3123
 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:
 ffffc9000479f780: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffffc9000479f800: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffffc9000479f880: f3 f3 f3 f3 f3 f3 f3 f3 00 00 00 00 00 00 00 00
                            ^
 ffffc9000479f900: 00 00 00 00 00 00 00 00 00 00 00 00 f1 f1 f1 f1
 ffffc9000479f980: 00 00 f3 f3 00 00 00 00 00 00 00 00 00 00 00 00
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