loop6: rw=0, sector=6491536, nr_sectors = 2 limit=128
buffer_io_error: 10 callbacks suppressed
Buffer I/O error on dev loop6, logical block 3245768, async page read
------------[ cut here ]------------
WARNING: CPU: 0 PID: 5915 at fs/inode.c:389 inc_nlink+0x128/0x154 fs/inode.c:389
Modules linked in:
CPU: 0 PID: 5915 Comm: iou-wrk-5914 Not tainted 6.1.126-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
pstate: 80400005 (Nzcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
pc : inc_nlink+0x128/0x154 fs/inode.c:389
lr : inc_nlink+0x128/0x154 fs/inode.c:389
sp : ffff8000226f7890
x29: ffff8000226f7890 x28: dfff800000000000 x27: 0000000000000000
x26: 1fffe0001ab2c49d x25: ffff800012714788 x24: 0000000000000000
x23: 1fffe0001c6ed810 x22: dfff800000000000 x21: 0000000000000000
x20: ffff0000e376c038 x19: ffff0000e376c080 x18: ffff8000226f70e0
x17: ffff80000a798748 x16: ffff80001232fc0c x15: ffff8000088113c0
x14: ffff800008966a78 x13: ffff80000802a100 x12: 0000000000000001
x11: 0000000000ff0100 x10: 0000000000000000 x9 : ffff800008aac518
x8 : ffff0000d5961bc0 x7 : ffff800008974efc x6 : ffff800008972384
x5 : ffff0000ce02a2b8 x4 : ffff80000aac1394 x3 : 0000000000000000
x2 : ffff0000e29dc2f0 x1 : 0000000000000000 x0 : 0000000000000000
Call trace:
 inc_nlink+0x128/0x154 fs/inode.c:389
 inode_inc_link_count include/linux/fs.h:2576 [inline]
 sysv_mkdir+0x2c/0x138 fs/sysv/namei.c:119
 vfs_mkdir+0x334/0x4e4 fs/namei.c:4106
 do_mkdirat+0x220/0x510 fs/namei.c:4131
 io_mkdirat+0x84/0x188 io_uring/fs.c:184
 io_issue_sqe+0x308/0xa24 io_uring/io_uring.c:1753
 io_wq_submit_work+0x3d4/0x760 io_uring/io_uring.c:1830
 io_worker_handle_work+0x728/0xc8c io_uring/io-wq.c:600
 io_wqe_worker+0x764/0xbec io_uring/io-wq.c:679
 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:864
irq event stamp: 384
hardirqs last  enabled at (383): [<ffff800008976228>] kasan_quarantine_put+0xdc/0x204 mm/kasan/quarantine.c:242
hardirqs last disabled at (384): [<ffff80001232c744>] el1_dbg+0x24/0x80 arch/arm64/kernel/entry-common.c:405
softirqs last  enabled at (372): [<ffff8000081c3414>] softirq_handle_end kernel/softirq.c:414 [inline]
softirqs last  enabled at (372): [<ffff8000081c3414>] handle_softirqs+0xb84/0xd58 kernel/softirq.c:599
softirqs last disabled at (237): [<ffff800008020174>] __do_softirq+0x14/0x20 kernel/softirq.c:605
---[ end trace 0000000000000000 ]---
==================================================================
BUG: KASAN: use-after-free in sysv_new_inode+0xd8c/0xf04 fs/sysv/ialloc.c:153
Read of size 2 at addr ffff0000e3e541ce by task iou-wrk-5914/5915

CPU: 0 PID: 5915 Comm: iou-wrk-5914 Tainted: G        W          6.1.126-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
Call trace:
 dump_backtrace+0x1c8/0x1f4 arch/arm64/kernel/stacktrace.c:158
 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:165
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x108/0x170 lib/dump_stack.c:106
 print_address_description mm/kasan/report.c:316 [inline]
 print_report+0x174/0x4c0 mm/kasan/report.c:427
 kasan_report+0xd4/0x130 mm/kasan/report.c:531
 __asan_report_load2_noabort+0x2c/0x38 mm/kasan/report_generic.c:349
 sysv_new_inode+0xd8c/0xf04 fs/sysv/ialloc.c:153
 sysv_mkdir+0x44/0x138 fs/sysv/namei.c:121
 vfs_mkdir+0x334/0x4e4 fs/namei.c:4106
 do_mkdirat+0x220/0x510 fs/namei.c:4131
 io_mkdirat+0x84/0x188 io_uring/fs.c:184
 io_issue_sqe+0x308/0xa24 io_uring/io_uring.c:1753
 io_wq_submit_work+0x3d4/0x760 io_uring/io_uring.c:1830
 io_worker_handle_work+0x728/0xc8c io_uring/io-wq.c:600
 io_wqe_worker+0x764/0xbec io_uring/io-wq.c:679
 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:864

The buggy address belongs to the physical page:
page:00000000731e0280 refcount:0 mapcount:-128 mapping:0000000000000000 index:0x1 pfn:0x123e54
flags: 0x5ffc00000000000(node=0|zone=2|lastcpupid=0x7ff)
raw: 05ffc00000000000 fffffc00038e6e88 fffffc0005767f08 0000000000000000
raw: 0000000000000001 0000000000000001 00000000ffffff7f 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff0000e3e54080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff0000e3e54100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>ffff0000e3e54180: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                                              ^
 ffff0000e3e54200: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff0000e3e54280: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
==================================================================