==================================================================
BUG: KASAN: use-after-free in ext4_ext_binsearch fs/ext4/extents.c:827 [inline]
BUG: KASAN: use-after-free in ext4_find_extent+0xbea/0xe30 fs/ext4/extents.c:946
Read of size 4 at addr ffff8881135bd090 by task kworker/u4:2/45

CPU: 0 PID: 45 Comm: kworker/u4:2 Not tainted 5.15.178-syzkaller-1079134-g058abb720bd1 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024
Workqueue: writeback wb_workfn (flush-7:0)
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x151/0x1c0 lib/dump_stack.c:106
 print_address_description+0x87/0x3b0 mm/kasan/report.c:248
 __kasan_report mm/kasan/report.c:427 [inline]
 kasan_report+0x179/0x1c0 mm/kasan/report.c:444
 __asan_report_load4_noabort+0x14/0x20 mm/kasan/report_generic.c:308
 ext4_ext_binsearch fs/ext4/extents.c:827 [inline]
 ext4_find_extent+0xbea/0xe30 fs/ext4/extents.c:946
 ext4_ext_map_blocks+0x269/0x7450 fs/ext4/extents.c:4165
 ext4_map_blocks+0xa60/0x1c70 fs/ext4/inode.c:673
 mpage_map_one_extent fs/ext4/inode.c:2420 [inline]
 mpage_map_and_submit_extent fs/ext4/inode.c:2473 [inline]
 ext4_writepages+0x1628/0x4000 fs/ext4/inode.c:2841
 do_writepages+0x40e/0x670 mm/page-writeback.c:2388
 __writeback_single_inode+0xdf/0xa70 fs/fs-writeback.c:1647
 writeback_sb_inodes+0xb2a/0x1920 fs/fs-writeback.c:1930
 wb_writeback+0x3c8/0x9f0 fs/fs-writeback.c:2106
 wb_do_writeback fs/fs-writeback.c:2253 [inline]
 wb_workfn+0x3d9/0x1110 fs/fs-writeback.c:2294
 process_one_work+0x6bb/0xc10 kernel/workqueue.c:2325
 worker_thread+0xad5/0x12a0 kernel/workqueue.c:2472
 kthread+0x421/0x510 kernel/kthread.c:337
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
 </TASK>

The buggy address belongs to the page:
page:ffffea00044d6f40 refcount:0 mapcount:0 mapping:0000000000000000 index:0x1 pfn:0x1135bd
flags: 0x4000000000000000(zone=1)
raw: 4000000000000000 ffffea00044d6f88 ffffea0004474008 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 293, ts 25664970413, free_ts 26683997635
 set_page_owner include/linux/page_owner.h:33 [inline]
 post_alloc_hook+0x1a3/0x1b0 mm/page_alloc.c:2605
 prep_new_page+0x1b/0x110 mm/page_alloc.c:2611
 get_page_from_freelist+0x3550/0x35d0 mm/page_alloc.c:4485
 __alloc_pages+0x27e/0x8f0 mm/page_alloc.c:5780
 __alloc_pages_node include/linux/gfp.h:591 [inline]
 alloc_pages_node include/linux/gfp.h:605 [inline]
 alloc_pages include/linux/gfp.h:618 [inline]
 wp_page_copy+0x200/0x1b00 mm/memory.c:3223
 do_wp_page+0x9ca/0xc90
 handle_pte_fault+0x799/0x25c0 mm/memory.c:4926
 do_handle_mm_fault+0x20bc/0x2400 mm/memory.c:5327
 do_user_addr_fault arch/x86/mm/fault.c:1325 [inline]
 handle_page_fault arch/x86/mm/fault.c:1509 [inline]
 exc_page_fault+0x26f/0x7f0 arch/x86/mm/fault.c:1565
 asm_exc_page_fault+0x27/0x30 arch/x86/include/asm/idtentry.h:606
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:26 [inline]
 free_pages_prepare mm/page_alloc.c:1472 [inline]
 free_pcp_prepare mm/page_alloc.c:1544 [inline]
 free_unref_page_prepare+0x7c8/0x7d0 mm/page_alloc.c:3534
 free_unref_page_list+0x14b/0xa60 mm/page_alloc.c:3671
 release_pages+0x1310/0x1370 mm/swap.c:1009
 free_pages_and_swap_cache+0x8a/0xa0 mm/swap_state.c:320
 tlb_batch_pages_flush mm/mmu_gather.c:49 [inline]
 tlb_flush_mmu_free mm/mmu_gather.c:240 [inline]
 tlb_flush_mmu+0xd0/0x180 mm/mmu_gather.c:247
 zap_pte_range mm/memory.c:1525 [inline]
 zap_pmd_range mm/memory.c:1574 [inline]
 zap_pud_range mm/memory.c:1603 [inline]
 zap_p4d_range mm/memory.c:1624 [inline]
 unmap_page_range+0x1c70/0x1ed0 mm/memory.c:1645
 unmap_single_vma mm/memory.c:1690 [inline]
 unmap_vmas+0x389/0x560 mm/memory.c:1722
 exit_mmap+0x458/0x990 mm/mmap.c:3233
 __mmput+0x95/0x310 kernel/fork.c:1180
 mmput+0x5b/0x170 kernel/fork.c:1203
 exit_mm kernel/exit.c:554 [inline]
 do_exit+0xb9c/0x2ca0 kernel/exit.c:867
 do_group_exit+0x141/0x310 kernel/exit.c:1002
 get_signal+0x7a3/0x1630 kernel/signal.c:2907
 arch_do_signal_or_restart+0xbd/0x1680 arch/x86/kernel/signal.c:867
 handle_signal_work kernel/entry/common.c:154 [inline]
 exit_to_user_mode_loop+0xa0/0xe0 kernel/entry/common.c:178
 exit_to_user_mode_prepare+0x5a/0xa0 kernel/entry/common.c:214

Memory state around the buggy address:
 ffff8881135bcf80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff8881135bd000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>ffff8881135bd080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                         ^
 ffff8881135bd100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff8881135bd180: 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:2432!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 45 Comm: kworker/u4:2 Tainted: G    B             5.15.178-syzkaller-1079134-g058abb720bd1 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024
Workqueue: writeback wb_workfn (flush-7:0)
RIP: 0010:mpage_map_one_extent fs/ext4/inode.c:2432 [inline]
RIP: 0010:mpage_map_and_submit_extent fs/ext4/inode.c:2473 [inline]
RIP: 0010:ext4_writepages+0x3f4b/0x4000 fs/ext4/inode.c:2841
Code: 00 74 08 48 89 df e8 a4 ab c9 ff 48 8b 3b 48 8b 74 24 48 48 8b 54 24 28 44 89 e9 45 89 f8 e8 8c 42 08 00 eb 58 e8 45 46 87 ff <0f> 0b e8 3e 46 87 ff eb 3b e8 37 46 87 ff eb 72 e8 30 46 87 ff 31
RSP: 0018:ffffc900002ef000 EFLAGS: 00010293
RAX: ffffffff81e9266b RBX: dffffc0000000000 RCX: ffff8881055fa780
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc900002ef410 R08: ffffffff81e9002b R09: ffffed1021320e05
R10: 0000000000000000 R11: dffffc0000000001 R12: 0000000000000000
R13: ffffc900002ef2e0 R14: 0000000000000000 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020009000 CR3: 000000010c4c6000 CR4: 00000000003506a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 do_writepages+0x40e/0x670 mm/page-writeback.c:2388
 __writeback_single_inode+0xdf/0xa70 fs/fs-writeback.c:1647
 writeback_sb_inodes+0xb2a/0x1920 fs/fs-writeback.c:1930
 wb_writeback+0x3c8/0x9f0 fs/fs-writeback.c:2106
 wb_do_writeback fs/fs-writeback.c:2253 [inline]
 wb_workfn+0x3d9/0x1110 fs/fs-writeback.c:2294
 process_one_work+0x6bb/0xc10 kernel/workqueue.c:2325
 worker_thread+0xad5/0x12a0 kernel/workqueue.c:2472
 kthread+0x421/0x510 kernel/kthread.c:337
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
 </TASK>
Modules linked in:
---[ end trace e50f593623896ecb ]---
RIP: 0010:mpage_map_one_extent fs/ext4/inode.c:2432 [inline]
RIP: 0010:mpage_map_and_submit_extent fs/ext4/inode.c:2473 [inline]
RIP: 0010:ext4_writepages+0x3f4b/0x4000 fs/ext4/inode.c:2841
Code: 00 74 08 48 89 df e8 a4 ab c9 ff 48 8b 3b 48 8b 74 24 48 48 8b 54 24 28 44 89 e9 45 89 f8 e8 8c 42 08 00 eb 58 e8 45 46 87 ff <0f> 0b e8 3e 46 87 ff eb 3b e8 37 46 87 ff eb 72 e8 30 46 87 ff 31
RSP: 0018:ffffc900002ef000 EFLAGS: 00010293
RAX: ffffffff81e9266b RBX: dffffc0000000000 RCX: ffff8881055fa780
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc900002ef410 R08: ffffffff81e9002b R09: ffffed1021320e05
R10: 0000000000000000 R11: dffffc0000000001 R12: 0000000000000000
R13: ffffc900002ef2e0 R14: 0000000000000000 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000558c6a2a5008 CR3: 000000010d319000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400