EXT4-fs (loop0): mounted filesystem without journal. Opts: ,errors=continue
==================================================================
BUG: KASAN: use-after-free in ext4_ext_binsearch_idx fs/ext4/extents.c:758 [inline]
BUG: KASAN: use-after-free in ext4_find_extent+0x697/0xd80 fs/ext4/extents.c:923
Read of size 4 at addr ffff88810e7ae368 by task syz-executor281/371

CPU: 1 PID: 371 Comm: syz-executor281 Not tainted 5.10.160-syzkaller-01321-g003c389455eb #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack_lvl+0x1e2/0x24b lib/dump_stack.c:118
 print_address_description+0x81/0x3c0 mm/kasan/report.c:233
 __kasan_report mm/kasan/report.c:419 [inline]
 kasan_report+0x1a4/0x1f0 mm/kasan/report.c:436
 __asan_report_load4_noabort+0x14/0x20 mm/kasan/report_generic.c:308
 ext4_ext_binsearch_idx fs/ext4/extents.c:758 [inline]
 ext4_find_extent+0x697/0xd80 fs/ext4/extents.c:923
 ext4_clu_mapped+0xa0/0x7a0 fs/ext4/extents.c:5806
 ext4_insert_delayed_block fs/ext4/inode.c:1697 [inline]
 ext4_da_map_blocks fs/ext4/inode.c:1807 [inline]
 ext4_da_get_block_prep+0x9f9/0x13d0 fs/ext4/inode.c:1871
 __block_write_begin_int+0x6df/0x1800 fs/buffer.c:2039
 __block_write_begin+0x30/0x40 fs/buffer.c:2089
 ext4_da_convert_inline_data_to_extent+0x310/0x5c0 fs/ext4/inline.c:844
 ext4_da_write_inline_data_begin+0x23b/0x750 fs/ext4/inline.c:917
 ext4_da_write_begin+0x532/0xf10 fs/ext4/inode.c:3039
 generic_perform_write+0x309/0x5b0 mm/filemap.c:3468
 ext4_buffered_write_iter+0x47c/0x610 fs/ext4/file.c:272
 ext4_file_write_iter+0x192/0x1c70 fs/ext4/file.c:689
 call_write_iter include/linux/fs.h:1969 [inline]
 new_sync_write fs/read_write.c:518 [inline]
 vfs_write+0xc4a/0xf80 fs/read_write.c:605
 ksys_write+0x198/0x2c0 fs/read_write.c:658
 __do_sys_write fs/read_write.c:670 [inline]
 __se_sys_write fs/read_write.c:667 [inline]
 __x64_sys_write+0x7b/0x90 fs/read_write.c:667
 do_syscall_64+0x34/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x61/0xc6
RIP: 0033:0x7f655525e7b9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 51 14 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 c0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffe5faa6898 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f655525e7b9
RDX: 00000000175d9003 RSI: 0000000020000200 RDI: 0000000000000004
RBP: 00007f655521e050 R08: 0000000000000000 R09: 0000000000000000
R10: 000000000000079f R11: 0000000000000246 R12: 00007f655521e0e0
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000

Allocated by task 296:
 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:428 [inline]
 __kasan_slab_alloc+0xb2/0xe0 mm/kasan/common.c:461
 kasan_slab_alloc include/linux/kasan.h:259 [inline]
 slab_post_alloc_hook include/../mm/slab.h:583 [inline]
 slab_alloc_node mm/slub.c:2956 [inline]
 slab_alloc mm/slub.c:2964 [inline]
 kmem_cache_alloc+0x16c/0x300 mm/slub.c:2969
 proc_alloc_inode+0x1d/0xb0 fs/proc/inode.c:69
 alloc_inode fs/inode.c:233 [inline]
 new_inode_pseudo+0x64/0x220 fs/inode.c:929
 new_inode+0x28/0x1c0 fs/inode.c:958
 proc_pid_make_inode+0x27/0x2f0 fs/proc/base.c:1894
 proc_pid_instantiate+0x4c/0x1a0 fs/proc/base.c:3348
 proc_pid_lookup+0x196/0x270 fs/proc/base.c:3391
 proc_root_lookup+0x22/0x50 fs/proc/root.c:321
 __lookup_slow+0x2b3/0x400 fs/namei.c:1630
 lookup_slow+0x5a/0x80 fs/namei.c:1647
 walk_component+0x425/0x5a0 fs/namei.c:1942
 link_path_walk+0x5e7/0xc40 fs/namei.c:2261
 path_openat+0x264/0x2fd0 fs/namei.c:3444
 do_filp_open+0x200/0x440 fs/namei.c:3475
 do_sys_openat2+0x13b/0x470 fs/open.c:1211
 do_sys_open fs/open.c:1227 [inline]
 __do_sys_openat fs/open.c:1243 [inline]
 __se_sys_openat fs/open.c:1238 [inline]
 __x64_sys_openat+0x243/0x290 fs/open.c:1238
 do_syscall_64+0x34/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x61/0xc6

Freed by task 143:
 kasan_save_stack mm/kasan/common.c:38 [inline]
 kasan_set_track+0x4c/0x80 mm/kasan/common.c:46
 kasan_set_free_info+0x23/0x40 mm/kasan/generic.c:357
 ____kasan_slab_free+0x121/0x160 mm/kasan/common.c:360
 __kasan_slab_free+0x11/0x20 mm/kasan/common.c:368
 kasan_slab_free include/linux/kasan.h:235 [inline]
 slab_free_hook mm/slub.c:1604 [inline]
 slab_free_freelist_hook+0xcc/0x1a0 mm/slub.c:1630
 slab_free mm/slub.c:3212 [inline]
 kmem_cache_free+0xa9/0x1f0 mm/slub.c:3228
 proc_free_inode+0x1d/0x20 fs/proc/inode.c:85
 i_callback+0x4b/0x70 fs/inode.c:222
 rcu_do_batch+0x59e/0xc40 kernel/rcu/tree.c:2485
 rcu_core+0x59b/0xe30 kernel/rcu/tree.c:2726
 rcu_core_si+0x9/0x10 kernel/rcu/tree.c:2739
 __do_softirq+0x27e/0x596 kernel/softirq.c:305

Last potentially related work creation:
 kasan_save_stack+0x36/0x60 mm/kasan/common.c:38
 kasan_record_aux_stack+0xca/0xf0 mm/kasan/generic.c:345
 __call_rcu kernel/rcu/tree.c:2967 [inline]
 call_rcu+0x140/0x1300 kernel/rcu/tree.c:3041
 destroy_inode fs/inode.c:288 [inline]
 evict+0x646/0x6c0 fs/inode.c:594
 iput_final fs/inode.c:1655 [inline]
 iput+0x61f/0x7d0 fs/inode.c:1681
 dentry_unlink_inode+0x2df/0x3d0 fs/dcache.c:374
 __dentry_kill+0x3e2/0x5d0 fs/dcache.c:579
 dentry_kill+0xc0/0x2a0 fs/dcache.c:692
 dput+0x175/0x320 fs/dcache.c:878
 proc_invalidate_siblings_dcache+0x2c1/0x410 fs/proc/inode.c:151
 proc_flush_pid+0x1a/0x20 fs/proc/base.c:3340
 release_task+0x10d6/0x1340 kernel/exit.c:223
 wait_task_zombie kernel/exit.c:1095 [inline]
 wait_consider_task+0x18a2/0x2970 kernel/exit.c:1322
 do_wait_thread kernel/exit.c:1385 [inline]
 do_wait+0x2f1/0x810 kernel/exit.c:1456
 kernel_wait4+0x29c/0x3c0 kernel/exit.c:1618
 __do_sys_wait4 kernel/exit.c:1646 [inline]
 __se_sys_wait4 kernel/exit.c:1642 [inline]
 __x64_sys_wait4+0x130/0x1e0 kernel/exit.c:1642
 do_syscall_64+0x34/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x61/0xc6

The buggy address belongs to the object at ffff88810e7ae350
 which belongs to the cache proc_inode_cache of size 776
The buggy address is located 24 bytes inside of
 776-byte region [ffff88810e7ae350, ffff88810e7ae658)
The buggy address belongs to the page:
page:ffffea000439eb00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x10e7ac
head:ffffea000439eb00 order:2 compound_mapcount:0 compound_pincount:0
flags: 0x8000000000010200(slab|head)
raw: 8000000000010200 dead000000000100 dead000000000122 ffff88810017f980
raw: 0000000000000000 0000000000120012 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 2, migratetype Reclaimable, gfp_mask 0xd20d0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_RECLAIMABLE), pid 293, ts 11702775924, free_ts 0
 set_page_owner include/linux/page_owner.h:35 [inline]
 post_alloc_hook mm/page_alloc.c:2386 [inline]
 prep_new_page mm/page_alloc.c:2392 [inline]
 get_page_from_freelist+0x755/0x810 mm/page_alloc.c:4073
 __alloc_pages_nodemask+0x3b6/0x890 mm/page_alloc.c:5160
 alloc_slab_page mm/slub.c:1815 [inline]
 allocate_slab+0x78/0x540 mm/slub.c:1817
 new_slab mm/slub.c:1878 [inline]
 new_slab_objects mm/slub.c:2636 [inline]
 ___slab_alloc+0x131/0x2e0 mm/slub.c:2800
 __slab_alloc+0x63/0xa0 mm/slub.c:2840
 slab_alloc_node mm/slub.c:2922 [inline]
 slab_alloc mm/slub.c:2964 [inline]
 kmem_cache_alloc+0x1ef/0x300 mm/slub.c:2969
 proc_alloc_inode+0x1d/0xb0 fs/proc/inode.c:69
 alloc_inode fs/inode.c:233 [inline]
 new_inode_pseudo+0x64/0x220 fs/inode.c:929
 new_inode+0x28/0x1c0 fs/inode.c:958
 proc_pid_make_inode+0x27/0x2f0 fs/proc/base.c:1894
 proc_pident_instantiate+0x75/0x2f0 fs/proc/base.c:2607
 proc_pident_lookup fs/proc/base.c:2643 [inline]
 proc_tgid_base_lookup+0x1a5/0x250 fs/proc/base.c:3307
 lookup_open fs/namei.c:3164 [inline]
 open_last_lookups fs/namei.c:3255 [inline]
 path_openat+0x119a/0x2fd0 fs/namei.c:3445
 do_filp_open+0x200/0x440 fs/namei.c:3475
 do_sys_openat2+0x13b/0x470 fs/open.c:1211
 do_sys_open fs/open.c:1227 [inline]
 __do_sys_openat fs/open.c:1243 [inline]
 __se_sys_openat fs/open.c:1238 [inline]
 __x64_sys_openat+0x243/0x290 fs/open.c:1238
page_owner free stack trace missing

Memory state around the buggy address:
 ffff88810e7ae200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88810e7ae280: fb fb fb fb fb fb fb fb fb fb fc fc fc fc fc fc
>ffff88810e7ae300: fc fc fc fc fc fc fc fc fc fc fa fb fb fb fb fb
                                                          ^
 ffff88810e7ae380: fb fb fb fb fb fb fb fb fb fb f