==================================================================
BUG: KASAN: use-after-free in ext4_ext_binsearch fs/ext4/extents.c:827 [inline]
BUG: KASAN: use-after-free in ext4_find_extent+0xba3/0xd80 fs/ext4/extents.c:946
Read of size 4 at addr ffff888124186138 by task kworker/u4:0/8
CPU: 1 PID: 8 Comm: kworker/u4:0 Not tainted 5.15.77-syzkaller-00764-g7048384c9872 #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:88 [inline]
dump_stack_lvl+0x151/0x1b7 lib/dump_stack.c:106
print_address_description+0x87/0x3d0 mm/kasan/report.c:256
__kasan_report mm/kasan/report.c:435 [inline]
kasan_report+0x1a6/0x1f0 mm/kasan/report.c:452
__asan_report_load4_noabort+0x14/0x20 mm/kasan/report_generic.c:308
ext4_ext_binsearch fs/ext4/extents.c:827 [inline]
ext4_find_extent+0xba3/0xd80 fs/ext4/extents.c:946
ext4_ext_map_blocks+0x22d/0x3cb0 fs/ext4/extents.c:4103
ext4_map_blocks+0xacd/0x1e20 fs/ext4/inode.c:640
ext4_convert_unwritten_extents+0x2ed/0x6e0 fs/ext4/extents.c:4818
ext4_convert_unwritten_io_end_vec+0x11d/0x1d0 fs/ext4/extents.c:4857
ext4_end_io_end fs/ext4/page-io.c:186 [inline]
ext4_do_flush_completed_IO fs/ext4/page-io.c:259 [inline]
ext4_end_io_rsv_work+0x3a0/0x740 fs/ext4/page-io.c:273
process_one_work+0x6db/0xc00 kernel/workqueue.c:2313
worker_thread+0xb3e/0x1340 kernel/workqueue.c:2460
kthread+0x41c/0x500 kernel/kthread.c:319
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:298
The buggy address belongs to the page:
page:ffffea0004906180 refcount:0 mapcount:0 mapping:0000000000000000 index:0x1 pfn:0x124186
flags: 0x4000000000000000(zone=1)
raw: 4000000000000000 ffffea00048f87c8 ffffea00048181c8 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 0x101cca(GFP_HIGHUSER_MOVABLE|__GFP_WRITE), pid 478, ts 25605343424, free_ts 25856357935
set_page_owner include/linux/page_owner.h:33 [inline]
post_alloc_hook+0x1ab/0x1b0 mm/page_alloc.c:2495
prep_new_page mm/page_alloc.c:2501 [inline]
get_page_from_freelist+0x38b/0x400 mm/page_alloc.c:4281
__alloc_pages+0x3a8/0x7c0 mm/page_alloc.c:5548
__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]
__page_cache_alloc include/linux/pagemap.h:305 [inline]
pagecache_get_page+0xa60/0xdb0 mm/filemap.c:1940
grab_cache_page_write_begin+0x5c/0xa0 mm/filemap.c:3779
ext4_write_begin+0x292/0x1360 fs/ext4/inode.c:1188
ext4_da_write_begin+0x4ac/0xbf0 fs/ext4/inode.c:2979
generic_perform_write+0x2cd/0x5d0 mm/filemap.c:3825
ext4_buffered_write_iter+0x49b/0x630 fs/ext4/file.c:271
ext4_file_write_iter+0x448/0x1cc0
call_write_iter include/linux/fs.h:2129 [inline]
new_sync_write fs/read_write.c:507 [inline]
vfs_write+0xc8d/0x1050 fs/read_write.c:594
ksys_write+0x198/0x2c0 fs/read_write.c:647
__do_sys_write fs/read_write.c:659 [inline]
__se_sys_write fs/read_write.c:656 [inline]
__x64_sys_write+0x7b/0x90 fs/read_write.c:656
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x61/0xcb
page last free stack trace:
reset_page_owner include/linux/page_owner.h:26 [inline]
free_pages_prepare mm/page_alloc.c:1364 [inline]
free_pcp_prepare+0x448/0x450 mm/page_alloc.c:1435
free_unref_page_prepare mm/page_alloc.c:3433 [inline]
free_unref_page_list+0x16a/0xad0 mm/page_alloc.c:3554
release_pages+0xf3e/0xf90 mm/swap.c:1010
__pagevec_release+0x81/0xf0 mm/swap.c:1030
pagevec_release include/linux/pagevec.h:81 [inline]
truncate_inode_pages_range+0x4b2/0x1150 mm/truncate.c:329
truncate_inode_pages mm/truncate.c:425 [inline]
truncate_inode_pages_final+0x83/0x90 mm/truncate.c:464
ext4_evict_inode+0x3e9/0x1470 fs/ext4/inode.c:214
evict+0x2a3/0x630 fs/inode.c:587
dispose_list fs/inode.c:620 [inline]
evict_inodes+0x638/0x6c0 fs/inode.c:670
generic_shutdown_super+0x9c/0x2d0 fs/super.c:454
kill_block_super+0x80/0xe0 fs/super.c:1395
deactivate_locked_super+0xb0/0x100 fs/super.c:335
deactivate_super+0xa5/0xd0 fs/super.c:366
cleanup_mnt+0x45f/0x510 fs/namespace.c:1143
__cleanup_mnt+0x19/0x20 fs/namespace.c:1150
task_work_run+0x147/0x1b0 kernel/task_work.c:164
Memory state around the buggy address:
ffff888124186000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
ffff888124186080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>ffff888124186100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
^
ffff888124186180: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
ffff888124186200: 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:3204!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 8 Comm: kworker/u4:0 Tainted: G B 5.15.77-syzkaller-00764-g7048384c9872 #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+0x12d4/0x1300 fs/ext4/extents.c:3204
Code: c1 38 c1 0f 8c 1b f9 ff ff 48 8b 7c 24 48 48 89 f3 e8 20 f4 c9 ff 48 89 de e9 06 f9 ff ff e8 23 90 87 ff 0f 0b e8 1c 90 87 ff <0f> 0b e8 15 90 87 ff 0f 0b e8 ee 4a d9 02 e8 09 90 87 ff 0f 0b e8
RSP: 0018:ffffc90000087400 EFLAGS: 00010293
RAX: ffffffff81e9ff74 RBX: 0000000000000000 RCX: ffff88810035e2c0
RDX: 0000000000000000 RSI: 0000000000000014 RDI: 0000000000000000
RBP: ffffc90000087570 R08: ffffffff81e9eef3 R09: ffffc90000087500
R10: fffff52000010ea2 R11: 1ffff92000010ea0 R12: 0000000000000000
R13: dffffc0000000000 R14: ffff8881241a06f4 R15: 0000000000000000
FS: 0000000000000000(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f146832a000 CR3: 000000011ec73000 CR4: 00000000003506a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
ext4_split_extent+0x369/0x4d0 fs/ext4/extents.c:3385
ext4_split_convert_extents fs/ext4/extents.c:3714 [inline]
ext4_convert_unwritten_extents_endio fs/ext4/extents.c:3750 [inline]
ext4_ext_handle_unwritten_extents+0x770/0x13e0 fs/ext4/extents.c:3898
ext4_ext_map_blocks+0xbfe/0x3cb0 fs/ext4/extents.c:4168
ext4_map_blocks+0xacd/0x1e20 fs/ext4/inode.c:640
ext4_convert_unwritten_extents+0x2ed/0x6e0 fs/ext4/extents.c:4818
ext4_convert_unwritten_io_end_vec+0x11d/0x1d0 fs/ext4/extents.c:4857
ext4_end_io_end fs/ext4/page-io.c:186 [inline]
ext4_do_flush_completed_IO fs/ext4/page-io.c:259 [inline]
ext4_end_io_rsv_work+0x3a0/0x740 fs/ext4/page-io.c:273
process_one_work+0x6db/0xc00 kernel/workqueue.c:2313
worker_thread+0xb3e/0x1340 kernel/workqueue.c:2460
kthread+0x41c/0x500 kernel/kthread.c:319
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:298
Modules linked in:
---[ end trace 6051cef24246704c ]---
RIP: 0010:ext4_split_extent_at+0x12d4/0x1300 fs/ext4/extents.c:3204
Code: c1 38 c1 0f 8c 1b f9 ff ff 48 8b 7c 24 48 48 89 f3 e8 20 f4 c9 ff 48 89 de e9 06 f9 ff ff e8 23 90 87 ff 0f 0b e8 1c 90 87 ff <0f> 0b e8 15 90 87 ff 0f 0b e8 ee 4a d9 02 e8 09 90 87 ff 0f 0b e8
RSP: 0018:ffffc90000087400 EFLAGS: 00010293
RAX: ffffffff81e9ff74 RBX: 0000000000000000 RCX: ffff88810035e2c0
RDX: 0000000000000000 RSI: 0000000000000014 RDI: 0000000000000000
RBP: ffffc90000087570 R08: ffffffff81e9eef3 R09: ffffc90000087500
R10: fffff52000010ea2 R11: 1ffff92000010ea0 R12: 0000000000000000
R13: dffffc0000000000 R14: ffff8881241a06f4 R15: 0000000000000000
FS: 0000000000000000(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f146832a000 CR3: 000000011a270000 CR4: 00000000003506a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400