==================================================================
BUG: KASAN: use-after-free in ext4_ext_binsearch fs/ext4/extents.c:827 [inline]
BUG: KASAN: use-after-free in ext4_find_extent+0xbab/0xdb0 fs/ext4/extents.c:946
Read of size 4 at addr ffff88812464b064 by task kworker/u4:0/8
CPU: 0 PID: 8 Comm: kworker/u4:0 Not tainted 5.15.148-syzkaller-1069047-g993bed180178 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024
Workqueue: writeback wb_workfn (flush-7:0)
Call Trace:
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0x151/0x1b7 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+0xbab/0xdb0 fs/ext4/extents.c:946
ext4_ext_map_blocks+0x254/0x7250 fs/ext4/extents.c:4103
ext4_map_blocks+0xaa7/0x1e00 fs/ext4/inode.c:646
mpage_map_one_extent fs/ext4/inode.c:2409 [inline]
mpage_map_and_submit_extent fs/ext4/inode.c:2462 [inline]
ext4_writepages+0x1628/0x4000 fs/ext4/inode.c:2830
do_writepages+0x40e/0x670 mm/page-writeback.c:2366
__writeback_single_inode+0xdf/0xa70 fs/fs-writeback.c:1647
writeback_sb_inodes+0xb2a/0x1920 fs/fs-writeback.c:1930
wb_writeback+0x3b9/0x9e0 fs/fs-writeback.c:2104
wb_do_writeback fs/fs-writeback.c:2247 [inline]
wb_workfn+0x3d9/0x1110 fs/fs-writeback.c:2288
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:298
The buggy address belongs to the page:
page:ffffea00049192c0 refcount:0 mapcount:0 mapping:0000000000000000 index:0x1 pfn:0x12464b
flags: 0x4000000000000000(zone=1)
raw: 4000000000000000 ffffea0004919308 ffffea0004919288 0000000000000000
raw: 0000000000000001 0000000000000000 00000000ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner info is not present (never set?)
Memory state around the buggy address:
ffff88812464af00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
ffff88812464af80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>ffff88812464b000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
^
ffff88812464b080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
ffff88812464b100: 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:2421!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 8 Comm: kworker/u4:0 Tainted: G B 5.15.148-syzkaller-1069047-g993bed180178 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024
Workqueue: writeback wb_workfn (flush-7:0)
RIP: 0010:mpage_map_one_extent fs/ext4/inode.c:2421 [inline]
RIP: 0010:mpage_map_and_submit_extent fs/ext4/inode.c:2462 [inline]
RIP: 0010:ext4_writepages+0x3f4b/0x4000 fs/ext4/inode.c:2830
Code: 00 74 08 48 89 df e8 f4 d7 c9 ff 48 8b 3b 48 8b 74 24 48 48 8b 54 24 28 44 89 e9 45 89 f8 e8 cc 2d 08 00 eb 58 e8 05 db 87 ff <0f> 0b e8 fe da 87 ff eb 3b e8 f7 da 87 ff eb 72 e8 f0 da 87 ff 31
RSP: 0018:ffffc90000087000 EFLAGS: 00010293
RAX: ffffffff81e8444b RBX: dffffc0000000000 RCX: ffff8881002662c0
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc90000087410 R08: ffffffff81e81e0b R09: ffffed1021f4dd4a
R10: 0000000000000000 R11: dffffc0000000001 R12: 0000000000000000
R13: ffffc900000872e0 R14: 0000000000000000 R15: 0000000000000000
FS: 0000000000000000(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffe8567df08 CR3: 000000000620f000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
do_writepages+0x40e/0x670 mm/page-writeback.c:2366
__writeback_single_inode+0xdf/0xa70 fs/fs-writeback.c:1647
writeback_sb_inodes+0xb2a/0x1920 fs/fs-writeback.c:1930
wb_writeback+0x3b9/0x9e0 fs/fs-writeback.c:2104
wb_do_writeback fs/fs-writeback.c:2247 [inline]
wb_workfn+0x3d9/0x1110 fs/fs-writeback.c:2288
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:298
Modules linked in:
---[ end trace 7d2630c67b1bad62 ]---
RIP: 0010:mpage_map_one_extent fs/ext4/inode.c:2421 [inline]
RIP: 0010:mpage_map_and_submit_extent fs/ext4/inode.c:2462 [inline]
RIP: 0010:ext4_writepages+0x3f4b/0x4000 fs/ext4/inode.c:2830
Code: 00 74 08 48 89 df e8 f4 d7 c9 ff 48 8b 3b 48 8b 74 24 48 48 8b 54 24 28 44 89 e9 45 89 f8 e8 cc 2d 08 00 eb 58 e8 05 db 87 ff <0f> 0b e8 fe da 87 ff eb 3b e8 f7 da 87 ff eb 72 e8 f0 da 87 ff 31
RSP: 0018:ffffc90000087000 EFLAGS: 00010293
RAX: ffffffff81e8444b RBX: dffffc0000000000 RCX: ffff8881002662c0
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc90000087410 R08: ffffffff81e81e0b R09: ffffed1021f4dd4a
R10: 0000000000000000 R11: dffffc0000000001 R12: 0000000000000000
R13: ffffc900000872e0 R14: 0000000000000000 R15: 0000000000000000
FS: 0000000000000000(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000564ef0de1018 CR3: 000000010c920000 CR4: 00000000003506a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400