EXT4-fs error (device loop4): ext4_convert_unwritten_extents:4818: inode #19: comm kworker/u4:3: mark_inode_dirty error
EXT4-fs (loop4): failed to convert unwritten extents to written extents -- potential data loss!  (inode 19, error -28)
==================================================================
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 ffff8881218594e4 by task kworker/u4:3/430

CPU: 0 PID: 430 Comm: kworker/u4:3 Not tainted 5.10.160-syzkaller-01321-g003c389455eb #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022
Workqueue: ext4-rsv-conversion ext4_end_io_rsv_work
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
 ext4_convert_unwritten_extents+0x2ad/0x5d0 fs/ext4/extents.c:4810
 ext4_convert_unwritten_io_end_vec+0x11d/0x1d0 fs/ext4/extents.c:4849
 ext4_end_io_end fs/ext4/page-io.c:189 [inline]
 ext4_do_flush_completed_IO fs/ext4/page-io.c:262 [inline]
 ext4_end_io_rsv_work+0x3a0/0x710 fs/ext4/page-io.c:276
 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:ffffea0004861640 refcount:0 mapcount:0 mapping:0000000000000000 index:0x1 pfn:0x121859
flags: 0x8000000000000000()
raw: 8000000000000000 ffffea00048730c8 ffffea000486e988 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 587, ts 26040654780, free_ts 26432412642
 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
 ptrace_notify+0x29a/0x340 kernel/signal.c:2278

Memory state around the buggy address:
 ffff888121859380: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff888121859400: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>ffff888121859480: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                                                       ^
 ffff888121859500: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff888121859580: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
==================================================================
EXT4-fs warning (device loop4): ext4_convert_unwritten_extents:4817: inode #19: block 27: len 1: ext4_ext_map_blocks returned -28
EXT4-fs error (device loop4) in ext4_reserve_inode_write:5851: Out of memory
EXT4-fs error (device loop4): ext4_convert_unwritten_extents:4818: inode #19: comm kworker/u4:3: mark_inode_dirty error
EXT4-fs (loop4): failed to convert unwritten extents to written extents -- potential data loss!  (inode 19, error -28)
EXT4-fs error (device loop4): ext4_map_blocks:718: inode #19: block 28: comm kworker/u4:3: lblock 28 mapped to illegal pblock 28 (length 1)
EXT4-fs warning (device loop4): ext4_convert_unwritten_extents:4817: inode #19: block 28: len 1: ext4_ext_map_blocks returned -117
EXT4-fs error (device loop4) in ext4_reserve_inode_write:5851: Out of memory
EXT4-fs (loop4): failed to convert unwritten extents to written extents -- potential data loss!  (inode 19, error -117)
EXT4-fs warning (device loop4): ext4_convert_unwritten_extents:4817: inode #19: block 29: len 1: ext4_ext_map_blocks returned -117
EXT4-fs (loop4): failed to convert unwritten extents to written extents -- potential data loss!  (inode 19, error -117)
EXT4-fs error (device loop3): ext4_map_blocks:718: inode #19: block 244: comm kworker/u4:3: lblock 36 mapped to illegal pblock 244 (length 1)
EXT4-fs warning (device loop3): ext4_convert_unwritten_extents:4817: inode #19: block 36: len 1: ext4_ext_map_blocks returned -117
EXT4-fs error (device loop3) in ext4_reserve_inode_write:5851: Out of memory
EXT4-fs error (device loop3): ext4_convert_unwritten_extents:4818: inode #19: comm kworker/u4:3: mark_inode_dirty error
EXT4-fs (loop3): failed to convert unwritten extents to written extents -- potential data loss!  (inode 19, error -117)
EXT4-fs error (device loop1): ext4_map_blocks:718: inode #19: block 229: comm kworker/u4:3: lblock 21 mapped to illegal pblock 229 (length 1)
EXT4-fs warning (device loop1): ext4_convert_unwritten_extents:4817: inode #19: block 21: len 1: ext4_ext_map_blocks returned -117
EXT4-fs error (device loop1) in ext4_reserve_inode_write:5851: Out of memory
EXT4-fs error (device loop1): ext4_convert_unwritten_extents:4818: inode #19: comm kworker/u4:3: mark_inode_dirty error
EXT4-fs (loop1): failed to convert unwritten extents to written extents -- potential data loss!  (inode 19, error -117)
EXT4-fs error (device loop4): ext4_map_blocks:718: inode #19: block 249: comm kworker/u4:3: lblock 41 mapped to illegal pblock 249 (length 1)
EXT4-fs warning (device loop4): ext4_convert_unwritten_extents:4817: inode #19: block 41: len 1: ext4_ext_map_blocks returned -117
EXT4-fs error (device loop4) in ext4_reserve_inode_write:5851: Out of memory
EXT4-fs error (device loop4): ext4_convert_unwritten_extents:4818: inode #19: comm kworker/u4:3: mark_inode_dirty error
EXT4-fs (loop4): failed to convert unwritten extents to written extents -- potential data loss!  (inode 19, error -117)
------------[ cut here ]------------
kernel BUG at fs/ext4/extents.c:3199!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 430 Comm: kworker/u4:3 Tainted: G    B             5.10.160-syzkaller-01321-g003c389455eb #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022
Workqueue: ext4-rsv-conversion ext4_end_io_rsv_work
RIP: 0010:ext4_split_extent_at+0xd0c/0x12c0 fs/ext4/extents.c:3199
Code: ff e8 68 06 96 ff 4c 89 f7 48 8d b4 24 00 01 00 00 e8 f8 06 00 00 e9 8a f9 ff ff b0 01 84 c0 0f 84 71 f5 ff ff e8 44 06 96 ff <0f> 0b 89 d9 80 e1 07 fe c1 38 c1 0f 8c 1b f4 ff ff 48 89 df e8 bb
RSP: 0018:ffffc90001167400 EFLAGS: 00010293
RAX: ffffffff81d71b6c RBX: 0000000000000000 RCX: ffff888105593b40
RDX: 0000000000000000 RSI: 000000000000002a RDI: 0000000000000000
RBP: ffffc90001167568 R08: ffffffff81d710c1 R09: ffffc90001167500
R10: fffff5200022cea2 R11: 1ffff9200022cea0 R12: 0000000000000000
R13: 000000000000002a R14: 0000000000000030 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fff9ec1ccc8 CR3: 000000010c573000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 ext4_split_extent+0x369/0x4d0 fs/ext4/extents.c:3380
 ext4_split_convert_extents fs/ext4/extents.c:3708 [inline]
 ext4_convert_unwritten_extents_endio fs/ext4/extents.c:3744 [inline]
 ext4_ext_handle_unwritten_extents+0x673/0x1170 fs/ext4/extents.c:3892
 ext4_ext_map_blocks+0xc06/0x3a30 fs/ext4/extents.c:4162
 ext4_map_blocks+0xa93/0x1ee0 fs/ext4/inode.c:638
 ext4_convert_unwritten_extents+0x2ad/0x5d0 fs/ext4/extents.c:4810
 ext4_convert_unwritten_io_end_vec+0x11d/0x1d0 fs/ext4/extents.c:4849
 ext4_end_io_end fs/ext4/page-io.c:189 [inline]
 ext4_do_flush_completed_IO fs/ext4/page-io.c:262 [inline]
 ext4_end_io_rsv_work+0x3a0/0x710 fs/ext4/page-io.c:276
 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 2d498038b44a11aa ]---
RIP: 0010:ext4_split_extent_at+0xd0c/0x12c0 fs/ext4/extents.c:3199
Code: ff e8 68 06 96 ff 4c 89 f7 48 8d b4 24 00 01 00 00 e8 f8 06 00 00 e9 8a f9 ff ff b0 01 84 c0 0f 84 71 f5 ff ff e8 44 06 96 ff <0f> 0b 89 d9 80 e1 07 fe c1 38 c1 0f 8c 1b f4 ff ff 48 89 df e8 bb
RSP: 0018:ffffc90001167400 EFLAGS: 00010293
RAX: ffffffff81d71b6c RBX: 0000000000000000 RCX: ffff888105593b40
RDX: 0000000000000000 RSI: 000000000000002a RDI: 0000000000000000
RBP: ffffc90001167568 R08: ffffffff81d710c1 R09: ffffc90001167500
R10: fffff5200022cea2 R11: 1ffff9200022cea0 R12: 0000000000000000
R13: 000000000000002a R14: 0000000000000030 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f4a66324f50 CR3: 000000010c573000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400