==================================================================
BUG: KASAN: slab-out-of-bounds in check_igot_inode fs/ext4/inode.c:-1 [inline]
BUG: KASAN: slab-out-of-bounds in __ext4_iget+0x2bb/0x3e50 fs/ext4/inode.c:4691
Read of size 8 at addr ffff88806034ff40 by task syz.2.2862/10600

CPU: 1 PID: 10600 Comm: syz.2.2862 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
Call Trace:
 <TASK>
 dump_stack_lvl+0x188/0x250 lib/dump_stack.c:106
 print_address_description+0x60/0x2d0 mm/kasan/report.c:248
 __kasan_report mm/kasan/report.c:434 [inline]
 kasan_report+0xdf/0x130 mm/kasan/report.c:451
 check_igot_inode fs/ext4/inode.c:-1 [inline]
 __ext4_iget+0x2bb/0x3e50 fs/ext4/inode.c:4691
 ext4_fill_super+0x73f9/0x94f0 fs/ext4/super.c:4872
 mount_bdev+0x287/0x3c0 fs/super.c:1400
 legacy_get_tree+0xe6/0x180 fs/fs_context.c:611
 vfs_get_tree+0x88/0x270 fs/super.c:1530
 do_new_mount+0x24a/0xa40 fs/namespace.c:3034
 do_mount fs/namespace.c:3377 [inline]
 __do_sys_mount fs/namespace.c:3585 [inline]
 __se_sys_mount+0x2e3/0x3d0 fs/namespace.c:3562
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f901a90e0ca
Code: 48 c7 c2 e8 ff ff ff f7 d8 64 89 02 b8 ff ff ff ff c3 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f9018b65e58 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f9018b65ee0 RCX: 00007f901a90e0ca
RDX: 0000200000000080 RSI: 0000200000000000 RDI: 00007f9018b65ea0
RBP: 0000200000000080 R08: 00007f9018b65ee0 R09: 000000000000080a
R10: 000000000000080a R11: 0000000000000246 R12: 0000200000000000
R13: 00007f9018b65ea0 R14: 00000000000007aa R15: 0000200000001400
 </TASK>

Allocated by task 4893:
 kasan_save_stack mm/kasan/common.c:38 [inline]
 kasan_set_track mm/kasan/common.c:46 [inline]
 set_alloc_info mm/kasan/common.c:434 [inline]
 __kasan_slab_alloc+0x9c/0xd0 mm/kasan/common.c:467
 kasan_slab_alloc include/linux/kasan.h:254 [inline]
 slab_post_alloc_hook+0x4c/0x380 mm/slab.h:519
 slab_alloc_node mm/slub.c:3225 [inline]
 slab_alloc mm/slub.c:3233 [inline]
 kmem_cache_alloc+0x100/0x290 mm/slub.c:3238
 proc_alloc_inode+0x19/0xa0 fs/proc/inode.c:69
 alloc_inode fs/inode.c:261 [inline]
 new_inode_pseudo+0x5f/0x210 fs/inode.c:1001
 new_inode+0x25/0x1c0 fs/inode.c:1030
 proc_pid_make_inode+0x20/0x1c0 fs/proc/base.c:1957
 proc_pident_instantiate+0x69/0x2b0 fs/proc/base.c:2698
 proc_pident_lookup+0x1c6/0x260 fs/proc/base.c:2734
 lookup_open fs/namei.c:3448 [inline]
 open_last_lookups fs/namei.c:3540 [inline]
 path_openat+0x1022/0x2fa0 fs/namei.c:3747
 do_filp_open+0x1e2/0x410 fs/namei.c:3777
 do_sys_openat2+0x150/0x4b0 fs/open.c:1255
 do_sys_open fs/open.c:1271 [inline]
 __do_sys_openat fs/open.c:1287 [inline]
 __se_sys_openat fs/open.c:1282 [inline]
 __x64_sys_openat+0x135/0x160 fs/open.c:1282
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0

Last potentially related work creation:
 kasan_save_stack+0x35/0x60 mm/kasan/common.c:38
 kasan_record_aux_stack+0xb8/0x100 mm/kasan/generic.c:348
 __call_rcu kernel/rcu/tree.c:3011 [inline]
 call_rcu+0x189/0x950 kernel/rcu/tree.c:3091
 destroy_inode fs/inode.c:316 [inline]
 evict+0x834/0x8d0 fs/inode.c:662
 proc_invalidate_siblings_dcache+0x3ef/0x650 fs/proc/inode.c:160
 release_task+0x1413/0x15b0 kernel/exit.c:269
 wait_task_zombie kernel/exit.c:1183 [inline]
 wait_consider_task+0x18fe/0x2e10 kernel/exit.c:1410
 do_wait_thread kernel/exit.c:1473 [inline]
 do_wait+0x2f8/0xac0 kernel/exit.c:1590
 kernel_wait4+0x22b/0x2b0 kernel/exit.c:1753
 __do_sys_wait4 kernel/exit.c:1781 [inline]
 __se_sys_wait4 kernel/exit.c:1777 [inline]
 __x64_sys_wait4+0x163/0x230 kernel/exit.c:1777
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0

Second to last potentially related work creation:
 kasan_save_stack+0x35/0x60 mm/kasan/common.c:38
 kasan_record_aux_stack+0xb8/0x100 mm/kasan/generic.c:348
 __call_rcu kernel/rcu/tree.c:3011 [inline]
 call_rcu+0x189/0x950 kernel/rcu/tree.c:3091
 destroy_inode fs/inode.c:316 [inline]
 evict+0x834/0x8d0 fs/inode.c:662
 __dentry_kill+0x431/0x650 fs/dcache.c:586
 shrink_dentry_list+0x388/0x680 fs/dcache.c:1181
 shrink_dcache_parent+0xae/0x3d0 fs/dcache.c:-1
 d_invalidate+0x116/0x260 fs/dcache.c:1717
 proc_invalidate_siblings_dcache+0x396/0x650 fs/proc/inode.c:150
 release_task+0x1413/0x15b0 kernel/exit.c:269
 wait_task_zombie kernel/exit.c:1183 [inline]
 wait_consider_task+0x18fe/0x2e10 kernel/exit.c:1410
 do_wait_thread kernel/exit.c:1473 [inline]
 do_wait+0x2f8/0xac0 kernel/exit.c:1590
 kernel_wait4+0x22b/0x2b0 kernel/exit.c:1753
 __do_sys_wait4 kernel/exit.c:1781 [inline]
 __se_sys_wait4 kernel/exit.c:1777 [inline]
 __x64_sys_wait4+0x163/0x230 kernel/exit.c:1777
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0

The buggy address belongs to the object at ffff88806034f590
 which belongs to the cache proc_inode_cache of size 1240
The buggy address is located 1240 bytes to the right of
 1240-byte region [ffff88806034f590, ffff88806034fa68)
The buggy address belongs to the page:
page:ffffea000180d200 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x60348
head:ffffea000180d200 order:3 compound_mapcount:0 compound_pincount:0
memcg:ffff88807e652301
flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000010200 dead000000000100 dead000000000122 ffff88801794a3c0
raw: 0000000000000000 0000000000170017 00000001ffffffff ffff88807e652301
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 3, migratetype Reclaimable, gfp_mask 0x1d20d0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL|__GFP_RECLAIMABLE), pid 4348, ts 70679367931, free_ts 21320366723
 prep_new_page mm/page_alloc.c:2426 [inline]
 get_page_from_freelist+0x1bbd/0x1ca0 mm/page_alloc.c:4192
 __alloc_pages+0x1ee/0x480 mm/page_alloc.c:5501
 alloc_slab_page mm/slub.c:1780 [inline]
 allocate_slab mm/slub.c:1917 [inline]
 new_slab+0xc0/0x4b0 mm/slub.c:1980
 ___slab_alloc+0x80a/0xdd0 mm/slub.c:3013
 __slab_alloc mm/slub.c:3100 [inline]
 slab_alloc_node mm/slub.c:3191 [inline]
 slab_alloc mm/slub.c:3233 [inline]
 kmem_cache_alloc+0x195/0x290 mm/slub.c:3238
 proc_alloc_inode+0x19/0xa0 fs/proc/inode.c:69
 alloc_inode fs/inode.c:261 [inline]
 new_inode_pseudo+0x5f/0x210 fs/inode.c:1001
 new_inode+0x25/0x1c0 fs/inode.c:1030
 proc_pid_make_inode+0x20/0x1c0 fs/proc/base.c:1957
 proc_pid_make_base_inode fs/proc/base.c:2008 [inline]
 proc_pid_instantiate+0x4f/0x2b0 fs/proc/base.c:3439
 proc_pid_lookup+0x2c4/0x3d0 fs/proc/base.c:3483
 proc_root_lookup+0x1c/0x50 fs/proc/root.c:322
 __lookup_slow+0x29d/0x410 fs/namei.c:1671
 lookup_slow+0x53/0x70 fs/namei.c:1688
 walk_component+0x319/0x460 fs/namei.c:1984
 link_path_walk+0x665/0xd70 fs/namei.c:-1
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:24 [inline]
 free_pages_prepare mm/page_alloc.c:1340 [inline]
 free_pcp_prepare mm/page_alloc.c:1391 [inline]
 free_unref_page_prepare+0x637/0x6c0 mm/page_alloc.c:3317
 free_unref_page+0x8f/0x2a0 mm/page_alloc.c:3396
 free_contig_range+0x96/0xf0 mm/page_alloc.c:9428
 destroy_args+0xf0/0xa00 mm/debug_vm_pgtable.c:1018
 debug_vm_pgtable+0x321/0x380 mm/debug_vm_pgtable.c:1336
 do_one_initcall+0x272/0x730 init/main.c:1316
 do_initcall_level+0x137/0x1f0 init/main.c:1389
 do_initcalls+0x4b/0x90 init/main.c:1405
 kernel_init_freeable+0x3e9/0x570 init/main.c:1629
 kernel_init+0x19/0x1b0 init/main.c:1520
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287

Memory state around the buggy address:
 ffff88806034fe00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff88806034fe80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff88806034ff00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
                                           ^
 ffff88806034ff80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff888060350000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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