EXT4-fs (loop1): mounted filesystem without journal. Opts: jqfmt=vfsold,resgid=0x000000000000ee00,bh,noload,data_err=ignore,usrjquota=,,errors=continue
EXT4-fs warning (device loop1): ext4_update_dynamic_rev:1047: updating to rev 1 because of new feature flag, running e2fsck is recommended
==================================================================
BUG: KASAN: use-after-free in ext4_search_dir+0xf7/0x1b0 fs/ext4/namei.c:1515
Read of size 1 at addr ffff88813e323ecf by task syz.1.495/2715

CPU: 0 PID: 2715 Comm: syz.1.495 Not tainted 5.10.223-syzkaller-00011-g1c5354a314ea #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack_lvl+0x1e2/0x24b lib/dump_stack.c:118
 print_address_description+0x81/0x3b0 mm/kasan/report.c:248
 __kasan_report mm/kasan/report.c:435 [inline]
 kasan_report+0x179/0x1c0 mm/kasan/report.c:452
 __asan_report_load1_noabort+0x14/0x20 mm/kasan/report_generic.c:306
 ext4_search_dir+0xf7/0x1b0 fs/ext4/namei.c:1515
 ext4_find_inline_entry+0x4b6/0x5e0 fs/ext4/inline.c:1700
 __ext4_find_entry+0x2b0/0x1990 fs/ext4/namei.c:1588
 ext4_lookup_entry fs/ext4/namei.c:1743 [inline]
 ext4_lookup+0x3c6/0xaa0 fs/ext4/namei.c:1811
 __lookup_slow+0x2b9/0x400 fs/namei.c:1640
 lookup_slow+0x5a/0x80 fs/namei.c:1657
 walk_component+0x48c/0x610 fs/namei.c:1952
 link_path_walk+0x5c7/0xbd0
 path_lookupat+0xa0/0x450 fs/namei.c:2426
 filename_lookup+0x26a/0x6f0 fs/namei.c:2460
 user_path_at_empty+0x40/0x50 fs/namei.c:2740
 user_path_at include/linux/namei.h:60 [inline]
 do_mount fs/namespace.c:3250 [inline]
 __do_sys_mount fs/namespace.c:3461 [inline]
 __se_sys_mount+0x285/0x3b0 fs/namespace.c:3438
 __x64_sys_mount+0xbf/0xd0 fs/namespace.c:3438
 do_syscall_64+0x34/0x70
 entry_SYSCALL_64_after_hwframe+0x61/0xcb
RIP: 0033:0x7f87bb443eb9
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:00007f87ba0c1038 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f87bb5dff80 RCX: 00007f87bb443eb9
RDX: 0000000000000000 RSI: 0000000020000200 RDI: 00000000200001c0
RBP: 00007f87bb4b193e R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000101091 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f87bb5dff80 R15: 00007fff46ec3138

The buggy address belongs to the page:
page:ffffea0004f8c8c0 refcount:0 mapcount:0 mapping:0000000000000000 index:0x1 pfn:0x13e323
flags: 0x4000000000000000()
raw: 4000000000000000 dead000000000100 dead000000000122 0000000000000000
raw: 0000000000000001 0000000000000000 00000000ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as freed
page last allocated via order 0, migratetype Movable, gfp_mask 0x100cca(GFP_HIGHUSER_MOVABLE), pid 2552, ts 115150782420, free_ts 115923734434
 set_page_owner include/linux/page_owner.h:35 [inline]
 post_alloc_hook mm/page_alloc.c:2456 [inline]
 prep_new_page+0x166/0x180 mm/page_alloc.c:2462
 get_page_from_freelist+0x2d8c/0x2f30 mm/page_alloc.c:4254
 __alloc_pages_nodemask+0x435/0xaf0 mm/page_alloc.c:5348
 __alloc_pages include/linux/gfp.h:544 [inline]
 __alloc_pages_node include/linux/gfp.h:557 [inline]
 alloc_pages_node include/linux/gfp.h:571 [inline]
 alloc_pages include/linux/gfp.h:590 [inline]
 shmem_alloc_page+0x257/0x420 mm/shmem.c:1580
 shmem_alloc_and_acct_page+0x395/0x8e0 mm/shmem.c:1605
 shmem_getpage_gfp+0x891/0x2480 mm/shmem.c:1918
 shmem_getpage mm/shmem.c:161 [inline]
 shmem_write_begin+0xca/0x1b0 mm/shmem.c:2500
 generic_perform_write+0x2cd/0x570 mm/filemap.c:3509
 __generic_file_write_iter+0x23c/0x560 mm/filemap.c:3638
 generic_file_write_iter+0xaf/0x1c0 mm/filemap.c:3670
 __kernel_write+0x5ab/0x9d0 fs/read_write.c:550
 dump_emit+0x261/0x3a0 fs/coredump.c:849
 dump_user_range+0x71/0x1a0 fs/coredump.c:902
 elf_core_dump+0x33bd/0x3c10 fs/binfmt_elf.c:2287
 do_coredump+0x1eb8/0x2d60 fs/coredump.c:811
 get_signal+0x102c/0x1410 kernel/signal.c:2768
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:28 [inline]
 free_pages_prepare mm/page_alloc.c:1349 [inline]
 free_pcp_prepare mm/page_alloc.c:1421 [inline]
 free_unref_page_prepare+0x2ae/0x2d0 mm/page_alloc.c:3336
 free_unref_page_list+0x122/0xb20 mm/page_alloc.c:3443
 release_pages+0xea0/0xef0 mm/swap.c:1103
 __pagevec_release+0x84/0x100 mm/swap.c:1123
 pagevec_release include/linux/pagevec.h:88 [inline]
 shmem_undo_range+0x7d1/0x1a60 mm/shmem.c:965
 shmem_truncate_range mm/shmem.c:1069 [inline]
 shmem_evict_inode+0x215/0x9d0 mm/shmem.c:1169
 evict+0x2a3/0x6c0 fs/inode.c:577
 iput_final fs/inode.c:1697 [inline]
 iput+0x632/0x7e0 fs/inode.c:1723
 dentry_unlink_inode+0x2ea/0x3d0 fs/dcache.c:378
 __dentry_kill+0x447/0x650 fs/dcache.c:583
 dentry_kill+0xc0/0x2a0
 dput+0x40/0x80 fs/dcache.c:883
 __fput+0x52e/0x7b0 fs/file_table.c:294
 ____fput+0x15/0x20 fs/file_table.c:314
 task_work_run+0x129/0x190 kernel/task_work.c:165
 exit_task_work include/linux/task_work.h:32 [inline]
 do_exit+0xc83/0x2a50 kernel/exit.c:863

Memory state around the buggy address:
 ffff88813e323d80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff88813e323e00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>ffff88813e323e80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                                              ^
 ffff88813e323f00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff88813e323f80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
==================================================================
device veth1_macvtap left promiscuous mode
EXT4-fs error (device loop1): ext4_read_inode_bitmap:140: comm syz.1.495: Invalid inode bitmap blk 4 in block_group 0