==================================================================
BUG: KASAN: use-after-free in ext4_ext_binsearch fs/ext4/extents.c:826 [inline]
BUG: KASAN: use-after-free in ext4_find_extent+0xba3/0xd80 fs/ext4/extents.c:945
Read of size 4 at addr ffff88819c057ad8 by task kworker/u4:4/487

CPU: 0 PID: 487 Comm: kworker/u4:4 Not tainted 5.10.161-syzkaller-00019-g416c4356f372 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/02/2023
Workqueue: writeback wb_workfn (flush-7:4)

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 fs/ext4/extents.c:826 [inline]
 ext4_find_extent+0xba3/0xd80 fs/ext4/extents.c:945
 ext4_ext_map_blocks+0x219/0x3a30 fs/ext4/extents.c:4097
 ext4_map_blocks+0xa93/0x1ee0 fs/ext4/inode.c:638
 mpage_map_one_extent+0x1bd/0x680 fs/ext4/inode.c:2441
 mpage_map_and_submit_extent fs/ext4/inode.c:2494 [inline]
 ext4_writepages+0x15e9/0x3710 fs/ext4/inode.c:2862
 do_writepages+0x13a/0x280 mm/page-writeback.c:2358
 __writeback_single_inode+0xb8/0x6e0 fs/fs-writeback.c:1467
 writeback_sb_inodes+0x999/0x1700 fs/fs-writeback.c:1730
 __writeback_inodes_wb fs/fs-writeback.c:1801 [inline]
 wb_writeback+0x4f4/0xc20 fs/fs-writeback.c:1907
 wb_check_old_data_flush fs/fs-writeback.c:2009 [inline]
 wb_do_writeback+0x995/0xbd0 fs/fs-writeback.c:2062
 wb_workfn+0xf8/0x3f0 fs/fs-writeback.c:2091
 process_one_work+0x726/0xc10 kernel/workqueue.c:2296
 worker_thread+0xb27/0x1550 kernel/workqueue.c:2442
 kthread+0x349/0x3d0 kernel/kthread.c:313
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:299

The buggy address belongs to the page:
page:ffffea00067015c0 refcount:0 mapcount:0 mapping:0000000000000000 index:0x1 pfn:0x19c057
flags: 0x8000000000000000()
raw: 8000000000000000 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 0x1100cca(GFP_HIGHUSER_MOVABLE), pid 4701, ts 936426889759, free_ts 936825648266
 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_pages include/linux/gfp.h:529 [inline]
 __alloc_pages_node include/linux/gfp.h:542 [inline]
 alloc_pages_node include/linux/gfp.h:556 [inline]
 alloc_pages include/linux/gfp.h:575 [inline]
 shmem_alloc_page mm/shmem.c:1582 [inline]
 shmem_alloc_and_acct_page+0x899/0xbf0 mm/shmem.c:1607
 shmem_getpage_gfp+0x8d4/0x25e0 mm/shmem.c:1920
 shmem_getpage mm/shmem.c:162 [inline]
 shmem_write_begin+0xc8/0x1b0 mm/shmem.c:2502
 generic_perform_write+0x309/0x5b0 mm/filemap.c:3468
 __generic_file_write_iter+0x23c/0x560 mm/filemap.c:3597
 generic_file_write_iter+0xaf/0x1c0 mm/filemap.c:3629
 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
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:28 [inline]
 free_pages_prepare mm/page_alloc.c:1332 [inline]
 free_pcp_prepare+0x18c/0x1c0 mm/page_alloc.c:1406
 free_unref_page_prepare mm/page_alloc.c:3293 [inline]
 free_unref_page_list+0x11d/0x660 mm/page_alloc.c:3367
 release_pages+0xc24/0xc60 mm/swap.c:1082
 __pagevec_release+0x81/0xf0 mm/swap.c:1102
 pagevec_release include/linux/pagevec.h:88 [inline]
 shmem_undo_range+0x7ac/0x18d0 mm/shmem.c:966
 shmem_truncate_range mm/shmem.c:1070 [inline]
 shmem_evict_inode+0x228/0xa20 mm/shmem.c:1170
 evict+0x2a3/0x6c0 fs/inode.c:577
 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
 __fput+0x540/0x7c0 fs/file_table.c:294
 ____fput+0x15/0x20 fs/file_table.c:314
 task_work_run+0x147/0x1b0 kernel/task_work.c:154
 tracehook_notify_resume include/linux/tracehook.h:188 [inline]
 exit_to_user_mode_loop+0xc8/0xe0 kernel/entry/common.c:164

Memory state around the buggy address:
 ffff88819c057980: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff88819c057a00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>ffff88819c057a80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                                                    ^
 ffff88819c057b00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff88819c057b80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
==================================================================
------------[ cut here ]------------
kernel BUG at fs/ext4/inode.c:2453!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 487 Comm: kworker/u4:4 Tainted: G    B             5.10.161-syzkaller-00019-g416c4356f372 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/02/2023
Workqueue: writeback wb_workfn (flush-7:4)
RIP: 0010:mpage_map_one_extent+0x5df/0x680 fs/ext4/inode.c:2453
Code: f6 48 0f a3 05 62 7b c1 04 0f 92 c3 40 0f 92 c6 31 ff e8 b4 a3 8f ff 84 db 75 11 e8 9b a0 8f ff e9 74 fa ff ff e8 91 a0 8f ff <0f> 0b 65 ff 05 64 ec 24 7e 48 c7 c0 68 cf 9c 86 48 c1 e8 03 42 80
RSP: 0018:ffffc9000653f068 EFLAGS: 00010293
RAX: ffffffff81dd811f RBX: 0000000000000000 RCX: ffff888118d7e2c0
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc9000653f0b0 R08: ffffffff81dd7fa8 R09: ffffed1031a3ccb1
R10: ffffed1031a3ccb1 R11: 1ffff11031a3ccb0 R12: 0000000000000000
R13: ffffc9000653f3b4 R14: 0000000000000000 R15: 1ffff92000ca7e77
FS:  0000000000000000(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000200300bf CR3: 000000011d71c000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 mpage_map_and_submit_extent fs/ext4/inode.c:2494 [inline]
 ext4_writepages+0x15e9/0x3710 fs/ext4/inode.c:2862
 do_writepages+0x13a/0x280 mm/page-writeback.c:2358
 __writeback_single_inode+0xb8/0x6e0 fs/fs-writeback.c:1467
 writeback_sb_inodes+0x999/0x1700 fs/fs-writeback.c:1730
 __writeback_inodes_wb fs/fs-writeback.c:1801 [inline]
 wb_writeback+0x4f4/0xc20 fs/fs-writeback.c:1907
 wb_check_old_data_flush fs/fs-writeback.c:2009 [inline]
 wb_do_writeback+0x995/0xbd0 fs/fs-writeback.c:2062
 wb_workfn+0xf8/0x3f0 fs/fs-writeback.c:2091
 process_one_work+0x726/0xc10 kernel/workqueue.c:2296
 worker_thread+0xb27/0x1550 kernel/workqueue.c:2442
 kthread+0x349/0x3d0 kernel/kthread.c:313
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:299
Modules linked in:
---[ end trace 41342f0030072df3 ]---
RIP: 0010:mpage_map_one_extent+0x5df/0x680 fs/ext4/inode.c:2453
Code: f6 48 0f a3 05 62 7b c1 04 0f 92 c3 40 0f 92 c6 31 ff e8 b4 a3 8f ff 84 db 75 11 e8 9b a0 8f ff e9 74 fa ff ff e8 91 a0 8f ff <0f> 0b 65 ff 05 64 ec 24 7e 48 c7 c0 68 cf 9c 86 48 c1 e8 03 42 80
RSP: 0018:ffffc9000653f068 EFLAGS: 00010293
RAX: ffffffff81dd811f RBX: 0000000000000000 RCX: ffff888118d7e2c0
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc9000653f0b0 R08: ffffffff81dd7fa8 R09: ffffed1031a3ccb1
R10: ffffed1031a3ccb1 R11: 1ffff11031a3ccb0 R12: 0000000000000000
R13: ffffc9000653f3b4 R14: 0000000000000000 R15: 1ffff92000ca7e77
FS:  0000000000000000(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000200300bf CR3: 000000011d71c000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400