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Subject: [syzbot] [io-uring?] memory leak in iovec_from_user (5)
From: syzbot <syzbot+321914d39d7553cca1e7@syzkaller.appspotmail.com>
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Hello,

syzbot found the following issue on:

HEAD commit:    c537e12daeec Merge tag 'bpf-fixes' of git://git.kernel.org..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=17c91d9a580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=87bc41cae23d2144
dashboard link: https://syzkaller.appspot.com/bug?extid=321914d39d7553cca1e7
compiler:       gcc (Debian 12.2.0-14+deb12u1) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=16a8d5fa580000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/b4f60c3c9800/disk-c537e12d.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/5f2c0a541579/vmlinux-c537e12d.xz
kernel image: https://storage.googleapis.com/syzbot-assets/32dcd74ba443/bzImage-c537e12d.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+321914d39d7553cca1e7@syzkaller.appspotmail.com

BUG: memory leak
unreferenced object 0xffff8881228893e0 (size 32):
  comm "syz.6.23", pid 6169, jiffies 4294942659
  hex dump (first 32 bytes):
    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
    00 00 00 00 00 00 00 00 01 00 00 00 00 00 00 00  ................
  backtrace (crc ccaa009e):
    kmemleak_alloc_recursive include/linux/kmemleak.h:44 [inline]
    slab_post_alloc_hook mm/slub.c:4958 [inline]
    slab_alloc_node mm/slub.c:5263 [inline]
    __do_kmalloc_node mm/slub.c:5656 [inline]
    __kmalloc_noprof+0x3e0/0x660 mm/slub.c:5669
    kmalloc_noprof include/linux/slab.h:961 [inline]
    kmalloc_array_noprof include/linux/slab.h:1003 [inline]
    iovec_from_user lib/iov_iter.c:1321 [inline]
    iovec_from_user+0x108/0x140 lib/iov_iter.c:1304
    __import_iovec+0x71/0x350 lib/iov_iter.c:1375
    io_import_vec io_uring/rw.c:99 [inline]
    __io_import_rw_buffer+0x1e2/0x260 io_uring/rw.c:120
    io_import_rw_buffer io_uring/rw.c:139 [inline]
    io_rw_do_import io_uring/rw.c:313 [inline]
    io_prep_rw+0xb5/0x120 io_uring/rw.c:325
    io_prep_rwv io_uring/rw.c:343 [inline]
    io_prep_writev+0x23/0x80 io_uring/rw.c:363
    io_init_req io_uring/io_uring.c:2235 [inline]
    io_submit_sqe io_uring/io_uring.c:2282 [inline]
    io_submit_sqes+0x40d/0xf40 io_uring/io_uring.c:2435
    __do_sys_io_uring_enter+0x841/0xcf0 io_uring/io_uring.c:3285
    do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
    do_syscall_64+0xa4/0xf80 arch/x86/entry/syscall_64.c:94
    entry_SYSCALL_64_after_hwframe+0x77/0x7f

BUG: memory leak
unreferenced object 0xffff888122889400 (size 32):
  comm "syz.6.23", pid 6169, jiffies 4294942659
  hex dump (first 32 bytes):
    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
    00 00 00 00 00 00 00 00 01 00 00 00 00 00 00 00  ................
  backtrace (crc ccaa009e):
    kmemleak_alloc_recursive include/linux/kmemleak.h:44 [inline]
    slab_post_alloc_hook mm/slub.c:4958 [inline]
    slab_alloc_node mm/slub.c:5263 [inline]
    __do_kmalloc_node mm/slub.c:5656 [inline]
    __kmalloc_noprof+0x3e0/0x660 mm/slub.c:5669
    kmalloc_noprof include/linux/slab.h:961 [inline]
    kmalloc_array_noprof include/linux/slab.h:1003 [inline]
    iovec_from_user lib/iov_iter.c:1321 [inline]
    iovec_from_user+0x108/0x140 lib/iov_iter.c:1304
    __import_iovec+0x71/0x350 lib/iov_iter.c:1375
    io_import_vec io_uring/rw.c:99 [inline]
    __io_import_rw_buffer+0x1e2/0x260 io_uring/rw.c:120
    io_import_rw_buffer io_uring/rw.c:139 [inline]
    io_rw_do_import io_uring/rw.c:313 [inline]
    io_prep_rw+0xb5/0x120 io_uring/rw.c:325
    io_prep_rwv io_uring/rw.c:343 [inline]
    io_prep_writev+0x23/0x80 io_uring/rw.c:363
    io_init_req io_uring/io_uring.c:2235 [inline]
    io_submit_sqe io_uring/io_uring.c:2282 [inline]
    io_submit_sqes+0x40d/0xf40 io_uring/io_uring.c:2435
    __do_sys_io_uring_enter+0x841/0xcf0 io_uring/io_uring.c:3285
    do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
    do_syscall_64+0xa4/0xf80 arch/x86/entry/syscall_64.c:94
    entry_SYSCALL_64_after_hwframe+0x77/0x7f

BUG: memory leak
unreferenced object 0xffff888122889420 (size 32):
  comm "syz.6.23", pid 6169, jiffies 4294942659
  hex dump (first 32 bytes):
    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
    00 00 00 00 00 00 00 00 01 00 00 00 00 00 00 00  ................
  backtrace (crc ccaa009e):
    kmemleak_alloc_recursive include/linux/kmemleak.h:44 [inline]
    slab_post_alloc_hook mm/slub.c:4958 [inline]
    slab_alloc_node mm/slub.c:5263 [inline]
    __do_kmalloc_node mm/slub.c:5656 [inline]
    __kmalloc_noprof+0x3e0/0x660 mm/slub.c:5669
    kmalloc_noprof include/linux/slab.h:961 [inline]
    kmalloc_array_noprof include/linux/slab.h:1003 [inline]
    iovec_from_user lib/iov_iter.c:1321 [inline]
    iovec_from_user+0x108/0x140 lib/iov_iter.c:1304
    __import_iovec+0x71/0x350 lib/iov_iter.c:1375
    io_import_vec io_uring/rw.c:99 [inline]
    __io_import_rw_buffer+0x1e2/0x260 io_uring/rw.c:120
    io_import_rw_buffer io_uring/rw.c:139 [inline]
    io_rw_do_import io_uring/rw.c:313 [inline]
    io_prep_rw+0xb5/0x120 io_uring/rw.c:325
    io_prep_rwv io_uring/rw.c:343 [inline]
    io_prep_writev+0x23/0x80 io_uring/rw.c:363
    io_init_req io_uring/io_uring.c:2235 [inline]
    io_submit_sqe io_uring/io_uring.c:2282 [inline]
    io_submit_sqes+0x40d/0xf40 io_uring/io_uring.c:2435
    __do_sys_io_uring_enter+0x841/0xcf0 io_uring/io_uring.c:3285
    do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
    do_syscall_64+0xa4/0xf80 arch/x86/entry/syscall_64.c:94
    entry_SYSCALL_64_after_hwframe+0x77/0x7f

BUG: memory leak
unreferenced object 0xffff888122889440 (size 32):
  comm "syz.6.23", pid 6169, jiffies 4294942659
  hex dump (first 32 bytes):
    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
    00 00 00 00 00 00 00 00 01 00 00 00 00 00 00 00  ................
  backtrace (crc ccaa009e):
    kmemleak_alloc_recursive include/linux/kmemleak.h:44 [inline]
    slab_post_alloc_hook mm/slub.c:4958 [inline]
    slab_alloc_node mm/slub.c:5263 [inline]
    __do_kmalloc_node mm/slub.c:5656 [inline]
    __kmalloc_noprof+0x3e0/0x660 mm/slub.c:5669
    kmalloc_noprof include/linux/slab.h:961 [inline]
    kmalloc_array_noprof include/linux/slab.h:1003 [inline]
    iovec_from_user lib/iov_iter.c:1321 [inline]
    iovec_from_user+0x108/0x140 lib/iov_iter.c:1304
    __import_iovec+0x71/0x350 lib/iov_iter.c:1375
    io_import_vec io_uring/rw.c:99 [inline]
    __io_import_rw_buffer+0x1e2/0x260 io_uring/rw.c:120
    io_import_rw_buffer io_uring/rw.c:139 [inline]
    io_rw_do_import io_uring/rw.c:313 [inline]
    io_prep_rw+0xb5/0x120 io_uring/rw.c:325
    io_prep_rwv io_uring/rw.c:343 [inline]
    io_prep_writev+0x23/0x80 io_uring/rw.c:363
    io_init_req io_uring/io_uring.c:2235 [inline]
    io_submit_sqe io_uring/io_uring.c:2282 [inline]
    io_submit_sqes+0x40d/0xf40 io_uring/io_uring.c:2435
    __do_sys_io_uring_enter+0x841/0xcf0 io_uring/io_uring.c:3285
    do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
    do_syscall_64+0xa4/0xf80 arch/x86/entry/syscall_64.c:94
    entry_SYSCALL_64_after_hwframe+0x77/0x7f

BUG: memory leak
unreferenced object 0xffff888122889460 (size 32):
  comm "syz.6.23", pid 6169, jiffies 4294942659
  hex dump (first 32 bytes):
    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
    00 00 00 00 00 00 00 00 01 00 00 00 00 00 00 00  ................
  backtrace (crc ccaa009e):
    kmemleak_alloc_recursive include/linux/kmemleak.h:44 [inline]
    slab_post_alloc_hook mm/slub.c:4958 [inline]
    slab_alloc_node mm/slub.c:5263 [inline]
    __do_kmalloc_node mm/slub.c:5656 [inline]
    __kmalloc_noprof+0x3e0/0x660 mm/slub.c:5669
    kmalloc_noprof include/linux/slab.h:961 [inline]
    kmalloc_array_noprof include/linux/slab.h:1003 [inline]
    iovec_from_user lib/iov_iter.c:1321 [inline]
    iovec_from_user+0x108/0x140 lib/iov_iter.c:1304
    __import_iovec+0x71/0x350 lib/iov_iter.c:1375
    io_import_vec io_uring/rw.c:99 [inline]
    __io_import_rw_buffer+0x1e2/0x260 io_uring/rw.c:120
    io_import_rw_buffer io_uring/rw.c:139 [inline]
    io_rw_do_import io_uring/rw.c:313 [inline]
    io_prep_rw+0xb5/0x120 io_uring/rw.c:325
    io_prep_rwv io_uring/rw.c:343 [inline]
    io_prep_writev+0x23/0x80 io_uring/rw.c:363
    io_init_req io_uring/io_uring.c:2235 [inline]
    io_submit_sqe io_uring/io_uring.c:2282 [inline]
    io_submit_sqes+0x40d/0xf40 io_uring/io_uring.c:2435
    __do_sys_io_uring_enter+0x841/0xcf0 io_uring/io_uring.c:3285
    do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
    do_syscall_64+0xa4/0xf80 arch/x86/entry/syscall_64.c:94
    entry_SYSCALL_64_after_hwframe+0x77/0x7f

BUG: memory leak
unreferenced object 0xffff888122889480 (size 32):
  comm "syz.6.23", pid 6169, jiffies 4294942659
  hex dump (first 32 bytes):
    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
    00 00 00 00 00 00 00 00 01 00 00 00 00 00 00 00  ................
  backtrace (crc ccaa009e):
    kmemleak_alloc_recursive include/linux/kmemleak.h:44 [inline]
    slab_post_alloc_hook mm/slub.c:4958 [inline]
    slab_alloc_node mm/slub.c:5263 [inline]
    __do_kmalloc_node mm/slub.c:5656 [inline]
    __kmalloc_noprof+0x3e0/0x660 mm/slub.c:5669
    kmalloc_noprof include/linux/slab.h:961 [inline]
    kmalloc_array_noprof include/linux/slab.h:1003 [inline]
    iovec_from_user lib/iov_iter.c:1321 [inline]
    iovec_from_user+0x108/0x140 lib/iov_iter.c:1304
    __import_iovec+0x71/0x350 lib/iov_iter.c:1375
    io_import_vec io_uring/rw.c:99 [inline]
    __io_import_rw_buffer+0x1e2/0x260 io_uring/rw.c:120
    io_import_rw_buffer io_uring/rw.c:139 [inline]
    io_rw_do_import io_uring/rw.c:313 [inline]
    io_prep_rw+0xb5/0x120 io_uring/rw.c:325
    io_prep_rwv io_uring/rw.c:343 [inline]
    io_prep_writev+0x23/0x80 io_uring/rw.c:363
    io_init_req io_uring/io_uring.c:2235 [inline]
    io_submit_sqe io_uring/io_uring.c:2282 [inline]
    io_submit_sqes+0x40d/0xf40 io_uring/io_uring.c:2435
    __do_sys_io_uring_enter+0x841/0xcf0 io_uring/io_uring.c:3285
    do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
    do_syscall_64+0xa4/0xf80 arch/x86/entry/syscall_64.c:94
    entry_SYSCALL_64_after_hwframe+0x77/0x7f

connection error: failed to recv *flatrpc.ExecutorMessageRawT: EOF


---
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If the report is already addressed, let syzbot know by replying with:
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Maddy (and everyone else),


Thank you all for your hard work in solving this issue!


Cedar Maxwell

On 12/26/25 10:23 PM, Madhavan Srinivasan wrote:
> On Mon, 10 Nov 2025 10:30:22 +1100, Finn Thain wrote:
>> Since Linux v6.7, booting using BootX on an Old World PowerMac produces
>> an early crash. Stan Johnson writes, "the symptoms are that the screen
>> goes blank and the backlight stays on, and the system freezes (Linux
>> doesn't boot)."
>>
>> Further testing revealed that the failure can be avoided by disabling
>> CONFIG_BOOTX_TEXT. Bisection revealed that the regression was caused by
>> a change to the font bitmap pointer that's used when btext_init() begins
>> painting characters on the display, early in the boot process.
>>
>> [...]
> Applied to powerpc/fixes.
>
> [1/1] powerpc: Add reloc_offset() to font bitmap pointer used for bootx_printf()
>        https://git.kernel.org/powerpc/c/b94b73567561642323617155bf4ee24ef0d258fe
>
> cheers


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