EXT4-fs (loop9): 1 orphan inode deleted
EXT4-fs (loop9): mounted filesystem without journal. Opts: discard,nodiscard,noquota,noinit_itable,stripe=0x0000000000000079,resgid=0x0000000000000000,sysvgroups,delalloc,delalloc,,errors=continue
ext4 filesystem being mounted at /269/file1 supports timestamps until 2038-01-19 (0x7fffffff)
==================================================================
BUG: KASAN: use-after-free in ext4_ext_binsearch fs/ext4/extents.c:826 [inline]
BUG: KASAN: use-after-free in ext4_find_extent+0xbea/0xe30 fs/ext4/extents.c:945
Read of size 4 at addr ffff888146fa6ccc by task syz.9.6226/24733

CPU: 1 PID: 24733 Comm: syz.9.6226 Tainted: G        W         5.10.234-syzkaller-00148-g6686f2996d23 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024
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_load4_noabort+0x14/0x20 mm/kasan/report_generic.c:308
 ext4_ext_binsearch fs/ext4/extents.c:826 [inline]
 ext4_find_extent+0xbea/0xe30 fs/ext4/extents.c:945
 ext4_ext_remove_space+0x369/0x4e10 fs/ext4/extents.c:2826
 ext4_punch_hole+0x720/0xb10 fs/ext4/inode.c:4216
 ext4_fallocate+0x2e8/0x1cc0 fs/ext4/extents.c:4756
 vfs_fallocate+0x492/0x570 fs/open.c:310
 ksys_fallocate fs/open.c:333 [inline]
 __do_sys_fallocate fs/open.c:341 [inline]
 __se_sys_fallocate fs/open.c:339 [inline]
 __x64_sys_fallocate+0xc0/0x110 fs/open.c:339
 do_syscall_64+0x34/0x70
 entry_SYSCALL_64_after_hwframe+0x61/0xcb
RIP: 0033:0x7fc9d08f1de9
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:00007fc9cef3b038 EFLAGS: 00000246 ORIG_RAX: 000000000000011d
RAX: ffffffffffffffda RBX: 00007fc9d0b0b080 RCX: 00007fc9d08f1de9
RDX: 0000000000000000 RSI: 0000000000000003 RDI: 000000000000000c
RBP: 00007fc9d09732a0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000001a00 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007fc9d0b0b080 R15: 00007fff58d0a258

The buggy address belongs to the page:
page:ffffea00051be980 refcount:0 mapcount:0 mapping:0000000000000000 index:0x1 pfn:0x146fa6
flags: 0x4000000000000000()
raw: 4000000000000000 ffffea00051be9c8 ffffea00051be948 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 24690, ts 970648124067, free_ts 970688310889
 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:2497
 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
 call_write_iter include/linux/fs.h:2058 [inline]
 new_sync_write fs/read_write.c:518 [inline]
 vfs_write+0xb4c/0xe70 fs/read_write.c:605
 ksys_write+0x199/0x2c0 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
 entry_SYSCALL_64_after_hwframe+0x61/0xcb
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+0x526/0x9c0 fs/inode.c:612
 iput_final fs/inode.c:1736 [inline]
 iput+0x632/0x7e0 fs/inode.c:1762
 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:189
 tracehook_notify_resume include/linux/tracehook.h:188 [inline]
 exit_to_user_mode_loop+0xbf/0xd0 kernel/entry/common.c:172

Memory state around the buggy address:
 ffff888146fa6b80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff888146fa6c00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>ffff888146fa6c80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                                              ^
 ffff888146fa6d00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff888146fa6d80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
==================================================================
------------[ cut here ]------------
kernel BUG at fs/ext4/extents.c:3180!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 24733 Comm: syz.9.6226 Tainted: G    B   W         5.10.234-syzkaller-00148-g6686f2996d23 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024
RIP: 0010:ext4_split_extent_at+0x121c/0x1240 fs/ext4/extents.c:3180
Code: fe c1 38 c1 0f 8c 16 fa ff ff e8 cf b7 cf ff 48 8b 54 24 58 48 8b 74 24 40 e9 02 fa ff ff e8 1b 18 92 ff 0f 0b e8 14 18 92 ff <0f> 0b e8 0d 18 92 ff 0f 0b e8 d6 49 d5 02 e8 01 18 92 ff 0f 0b e8
RSP: 0018:ffffc90001357820 EFLAGS: 00010283
RAX: ffffffff81d8a74c RBX: 0000000000000000 RCX: 0000000000080000
RDX: ffffc9000755f000 RSI: 000000000005c300 RDI: 000000000005c301
RBP: ffffc90001357990 R08: ffffffff81d897b2 R09: ffffc90001357920
R10: fffff5200026af25 R11: dffffc0000000001 R12: 0000000000000000
R13: 0000000000000000 R14: 1ffff11028df5530 R15: 0000000000000000
FS:  00007fc9cef3b6c0(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000040000100023f CR3: 000000011675b000 CR4: 00000000003526a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 ext4_force_split_extent_at fs/ext4/extents.c:318 [inline]
 ext4_ext_remove_space+0x719/0x4e10 fs/ext4/extents.c:2873
 ext4_punch_hole+0x720/0xb10 fs/ext4/inode.c:4216
 ext4_fallocate+0x2e8/0x1cc0 fs/ext4/extents.c:4756
 vfs_fallocate+0x492/0x570 fs/open.c:310
 ksys_fallocate fs/open.c:333 [inline]
 __do_sys_fallocate fs/open.c:341 [inline]
 __se_sys_fallocate fs/open.c:339 [inline]
 __x64_sys_fallocate+0xc0/0x110 fs/open.c:339
 do_syscall_64+0x34/0x70
 entry_SYSCALL_64_after_hwframe+0x61/0xcb
RIP: 0033:0x7fc9d08f1de9
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:00007fc9cef3b038 EFLAGS: 00000246 ORIG_RAX: 000000000000011d
RAX: ffffffffffffffda RBX: 00007fc9d0b0b080 RCX: 00007fc9d08f1de9
RDX: 0000000000000000 RSI: 0000000000000003 RDI: 000000000000000c
RBP: 00007fc9d09732a0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000001a00 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007fc9d0b0b080 R15: 00007fff58d0a258
Modules linked in:
---[ end trace bdbb80d0839a30c4 ]---
RIP: 0010:ext4_split_extent_at+0x121c/0x1240 fs/ext4/extents.c:3180
Code: fe c1 38 c1 0f 8c 16 fa ff ff e8 cf b7 cf ff 48 8b 54 24 58 48 8b 74 24 40 e9 02 fa ff ff e8 1b 18 92 ff 0f 0b e8 14 18 92 ff <0f> 0b e8 0d 18 92 ff 0f 0b e8 d6 49 d5 02 e8 01 18 92 ff 0f 0b e8
RSP: 0018:ffffc90001357820 EFLAGS: 00010283
RAX: ffffffff81d8a74c RBX: 0000000000000000 RCX: 0000000000080000
RDX: ffffc9000755f000 RSI: 000000000005c300 RDI: 000000000005c301
RBP: ffffc90001357990 R08: ffffffff81d897b2 R09: ffffc90001357920
R10: fffff5200026af25 R11: dffffc0000000001 R12: 0000000000000000
R13: 0000000000000000 R14: 1ffff11028df5530 R15: 0000000000000000
FS:  00007fc9cef3b6c0(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000040000100023f CR3: 000000011675b000 CR4: 00000000003526a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400