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BUG: KASAN: stack-out-of-bounds in gfs2_dump_glock+0x15b1/0x1bb0
Read of size 8 at addr ffffc900025efca0 by task syz.4.1376/11694

CPU: 1 UID: 0 PID: 11694 Comm: syz.4.1376 Not tainted 6.12.0-next-20241128-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
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:378 [inline]
 print_report+0x169/0x550 mm/kasan/report.c:489
 kasan_report+0x143/0x180 mm/kasan/report.c:602
 gfs2_dump_glock+0x15b1/0x1bb0
 gfs2_consist_inode_i+0xf5/0x110 fs/gfs2/util.c:457
 gfs2_dirent_scan+0x52b/0x670
 gfs2_dirent_search+0x30e/0x8c0 fs/gfs2/dir.c:853
 gfs2_dir_search+0xb2/0x2f0 fs/gfs2/dir.c:1653
 gfs2_lookupi+0x461/0x5e0 fs/gfs2/inode.c:340
 __gfs2_lookup+0xa4/0x280 fs/gfs2/inode.c:897
 gfs2_atomic_open+0x9e/0x230 fs/gfs2/inode.c:1298
 atomic_open fs/namei.c:3509 [inline]
 lookup_open fs/namei.c:3620 [inline]
 open_last_lookups fs/namei.c:3748 [inline]
 path_openat+0x101b/0x3590 fs/namei.c:3984
 do_filp_open+0x27f/0x4e0 fs/namei.c:4014
 do_sys_openat2+0x13e/0x1d0 fs/open.c:1402
 do_sys_open fs/open.c:1417 [inline]
 __do_sys_open fs/open.c:1425 [inline]
 __se_sys_open fs/open.c:1421 [inline]
 __x64_sys_open+0x225/0x270 fs/open.c:1421
 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: 0033:0x7fe121f80849
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:00007fe122cf6058 EFLAGS: 00000246 ORIG_RAX: 0000000000000002
RAX: ffffffffffffffda RBX: 00007fe122146080 RCX: 00007fe121f80849
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000020000100
RBP: 00007fe121ff3986 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007fe122146080 R15: 00007fffe2388c68
 </TASK>

The buggy address belongs to the virtual mapping at
 [ffffc900025e8000, ffffc900025f1000) created by:
 copy_process+0x5d1/0x3d50 kernel/fork.c:2222

The buggy address belongs to the physical page:
page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x7cecd
memcg:ffff88802fb4ac82
flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000000000 0000000000000000 dead000000000122 0000000000000000
raw: 0000000000000000 0000000000000000 00000001ffffffff ffff88802fb4ac82
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Unmovable, gfp_mask 0x2dc2(GFP_KERNEL|__GFP_HIGHMEM|__GFP_NOWARN|__GFP_ZERO), pid 5834, tgid 5834 (udevd), ts 421342479163, free_ts 415966894408
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0x1f3/0x230 mm/page_alloc.c:1556
 prep_new_page mm/page_alloc.c:1564 [inline]
 get_page_from_freelist+0x3738/0x3880 mm/page_alloc.c:3510
 __alloc_pages_noprof+0x292/0x710 mm/page_alloc.c:4787
 alloc_pages_mpol_noprof+0x3e8/0x680 mm/mempolicy.c:2265
 vm_area_alloc_pages mm/vmalloc.c:3589 [inline]
 __vmalloc_area_node mm/vmalloc.c:3667 [inline]
 __vmalloc_node_range_noprof+0x9c9/0x1380 mm/vmalloc.c:3844
 alloc_thread_stack_node kernel/fork.c:314 [inline]
 dup_task_struct+0x444/0x8c0 kernel/fork.c:1121
 copy_process+0x5d1/0x3d50 kernel/fork.c:2222
 kernel_clone+0x226/0x8e0 kernel/fork.c:2804
 __do_sys_clone kernel/fork.c:2947 [inline]
 __se_sys_clone kernel/fork.c:2931 [inline]
 __x64_sys_clone+0x258/0x2a0 kernel/fork.c:2931
 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 11589 tgid 11589 stack trace:
 reset_page_owner include/linux/page_owner.h:25 [inline]
 free_pages_prepare mm/page_alloc.c:1127 [inline]
 free_unref_folios+0xf62/0x1a90 mm/page_alloc.c:2740
 folios_put_refs+0x76c/0x860 mm/swap.c:962
 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
 exit_mmap+0x4d5/0xca0 mm/mmap.c:1680
 __mmput+0x115/0x3c0 kernel/fork.c:1350
 exit_mm+0x220/0x310 kernel/exit.c:570
 do_exit+0x9b2/0x28e0 kernel/exit.c:925
 do_group_exit+0x207/0x2c0 kernel/exit.c:1087
 __do_sys_exit_group kernel/exit.c:1098 [inline]
 __se_sys_exit_group kernel/exit.c:1096 [inline]
 __x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1096
 x64_sys_call+0x26a8/0x26b0 arch/x86/include/generated/asm/syscalls_64.h:232
 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:
 ffffc900025efb80: 00 f3 f3 f3 00 00 00 00 00 00 00 00 00 00 00 00
 ffffc900025efc00: 00 00 00 00 f1 f1 f1 f1 00 00 00 00 00 00 00 00
>ffffc900025efc80: 00 f3 f3 f3 f3 f3 f3 f3 00 00 00 00 00 00 00 00
                               ^
 ffffc900025efd00: 00 00 00 00 00 00 00 00 00 00 00 00 f1 f1 f1 f1
 ffffc900025efd80: 04 f3 f3 f3 00 00 00 00 00 00 00 00 00 00 00 00
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