ext4 filesystem being mounted at /root/syzkaller.5YOb4T/1/file1 supports timestamps until 2038 (0x7fffffff)
==================================================================
BUG: KASAN: use-after-free in ext4_ext_binsearch fs/ext4/extents.c:827 [inline]
BUG: KASAN: use-after-free in ext4_find_extent+0xbc4/0xdd0 fs/ext4/extents.c:946
Read of size 4 at addr ffff8880727dd070 by task syz-executor373/3504

CPU: 0 PID: 3504 Comm: syz-executor373 Not tainted 5.15.126-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/26/2023
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x1e3/0x2cb lib/dump_stack.c:106
 print_address_description+0x63/0x3b0 mm/kasan/report.c:248
 __kasan_report mm/kasan/report.c:434 [inline]
 kasan_report+0x16b/0x1c0 mm/kasan/report.c:451
 ext4_ext_binsearch fs/ext4/extents.c:827 [inline]
 ext4_find_extent+0xbc4/0xdd0 fs/ext4/extents.c:946
 ext4_ext_map_blocks+0x2ca/0x7220 fs/ext4/extents.c:4103
 ext4_map_blocks+0xaad/0x1e00 fs/ext4/inode.c:645
 _ext4_get_block+0x23b/0x660 fs/ext4/inode.c:792
 __block_write_begin_int+0x60b/0x1650 fs/buffer.c:2012
 __block_write_begin fs/buffer.c:2062 [inline]
 block_page_mkwrite+0x210/0x280 fs/buffer.c:2525
 ext4_page_mkwrite+0x3e9/0x1290 fs/ext4/inode.c:6188
 do_page_mkwrite+0x1a9/0x440 mm/memory.c:2892
 wp_page_shared+0x179/0x690 mm/memory.c:3229
 handle_pte_fault mm/memory.c:4639 [inline]
 __handle_mm_fault mm/memory.c:4756 [inline]
 handle_mm_fault+0x2a3d/0x5950 mm/memory.c:4854
 do_user_addr_fault arch/x86/mm/fault.c:1397 [inline]
 handle_page_fault arch/x86/mm/fault.c:1485 [inline]
 exc_page_fault+0x271/0x740 arch/x86/mm/fault.c:1541
 asm_exc_page_fault+0x22/0x30 arch/x86/include/asm/idtentry.h:568
RIP: 0033:0x7f2ceee8337e
Code: 73 00 e9 e3 f7 ff ff 66 c7 04 25 00 01 00 20 2e 00 e9 05 f8 ff ff b8 00 36 00 20 48 8d 35 42 d4 09 00 b9 25 00 00 00 48 89 c7 <f3> 48 a5 0f b6 06 88 07 e9 15 f8 ff ff 50 b9 00 36 00 20 ba ac 04
RSP: 002b:00007ffd2c3749d0 EFLAGS: 00010246
RAX: 0000000020003600 RBX: 0000000000000003 RCX: 0000000000000025
RDX: fa2d854d309f2dfe RSI: 00007f2ceef207b8 RDI: 0000000020003600
RBP: 0000000000000000 R08: 00007ffd2c3749fc R09: 00007ffd2c3749fc
R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffd2c3749fc
R13: 0000000000000001 R14: 431bde82d7b634db R15: 00007ffd2c374a30
 </TASK>

The buggy address belongs to the page:
page:ffffea0001c9f740 refcount:0 mapcount:0 mapping:0000000000000000 index:0x1 pfn:0x727dd
flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000000000 ffffea0001c9f788 ffffea0001c9f708 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 0x1100dca(GFP_HIGHUSER_MOVABLE|__GFP_ZERO), pid 3494, ts 99120544234, free_ts 99146070093
 prep_new_page mm/page_alloc.c:2426 [inline]
 get_page_from_freelist+0x322a/0x33c0 mm/page_alloc.c:4159
 __alloc_pages+0x272/0x700 mm/page_alloc.c:5421
 alloc_pages_vma+0x39a/0x800 mm/mempolicy.c:2146
 do_anonymous_page mm/memory.c:3808 [inline]
 handle_pte_fault mm/memory.c:4619 [inline]
 __handle_mm_fault mm/memory.c:4756 [inline]
 handle_mm_fault+0x2f49/0x5950 mm/memory.c:4854
 do_user_addr_fault arch/x86/mm/fault.c:1397 [inline]
 handle_page_fault arch/x86/mm/fault.c:1485 [inline]
 exc_page_fault+0x271/0x740 arch/x86/mm/fault.c:1541
 asm_exc_page_fault+0x22/0x30 arch/x86/include/asm/idtentry.h:568
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+0xc34/0xcf0 mm/page_alloc.c:3317
 free_unref_page_list+0x1f7/0x8e0 mm/page_alloc.c:3433
 release_pages+0x1bb9/0x1f40 mm/swap.c:963
 tlb_batch_pages_flush mm/mmu_gather.c:49 [inline]
 tlb_flush_mmu_free mm/mmu_gather.c:240 [inline]
 tlb_flush_mmu mm/mmu_gather.c:247 [inline]
 tlb_finish_mmu+0x177/0x320 mm/mmu_gather.c:338
 exit_mmap+0x3cd/0x670 mm/mmap.c:3188
 __mmput+0x112/0x3b0 kernel/fork.c:1118
 exit_mm+0x688/0x7f0 kernel/exit.c:548
 do_exit+0x626/0x2480 kernel/exit.c:859
 do_group_exit+0x144/0x310 kernel/exit.c:994
 __do_sys_exit_group kernel/exit.c:1005 [inline]
 __se_sys_exit_group kernel/exit.c:1003 [inline]
 __x64_sys_exit_group+0x3b/0x40 kernel/exit.c:1003
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x61/0xcb

Memory state around the buggy address:
 ffff8880727dcf00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff8880727dcf80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>ffff8880727dd000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                                                             ^
 ffff8880727dd080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff8880727dd100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
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