Re: [syzbot] [io-uring?] WARNING in io_pin_pages

syzbot
2024-11-25T23:34:02Z

Hello,

syzbot has tested the proposed patch but the reproducer is still triggering an issue:
WARNING in io_pin_pages

------------[ cut here ]------------
WARNING: CPU: 0 PID: 6625 at io_uring/memmap.c:146 io_pin_pages+0x149/0x180 io_uring/memmap.c:146
Modules linked in:
CPU: 0 UID: 0 PID: 6625 Comm: syz.0.15 Not tainted 6.12.0-rc4-syzkaller-00087-g9788f6363f9a #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
RIP: 0010:io_pin_pages+0x149/0x180 io_uring/memmap.c:146
Code: 63 fd 4c 89 f8 5b 41 5c 41 5e 41 5f 5d c3 cc cc cc cc e8 0a f9 e8 fc 90 0f 0b 90 49 c7 c7 ea ff ff ff eb de e8 f8 f8 e8 fc 90 <0f> 0b 90 49 c7 c7 b5 ff ff ff eb cc 44 89 f1 80 e1 07 80 c1 03 38
RSP: 0018:ffffc90002ee7c10 EFLAGS: 00010293
RAX: ffffffff84abe228 RBX: fff0000000000091 RCX: ffff88806d4c9e00
RDX: 0000000000000000 RSI: fff0000000000091 RDI: 000000007fffffff
RBP: 000ffffffffffff0 R08: ffffffff84abe12e R09: 1ffff1100f98b260
R10: dffffc0000000000 R11: ffffed100f98b261 R12: ffffffffffff0000
R13: ffffffffffff0000 R14: ffffc90002ee7c80 R15: 1ffff110024de520
FS: 00007f3e6a15a6c0(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b3255ffff CR3: 00000000339f8000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<TASK>
__io_uaddr_map+0xfb/0x2d0 io_uring/memmap.c:185
io_rings_map io_uring/io_uring.c:2632 [inline]
io_allocate_scq_urings+0x212/0x710 io_uring/io_uring.c:3491
io_uring_create+0x5b5/0xc00 io_uring/io_uring.c:3713
io_uring_setup io_uring/io_uring.c:3802 [inline]
__do_sys_io_uring_setup io_uring/io_uring.c:3829 [inline]
__se_sys_io_uring_setup+0x2ba/0x330 io_uring/io_uring.c:3823
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f3e6937e759
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f3e6a159fc8 EFLAGS: 00000202 ORIG_RAX: 00000000000001a9
RAX: ffffffffffffffda RBX: 00007f3e69535f80 RCX: 00007f3e6937e759
RDX: 0000000000000000 RSI: 0000000020000400 RDI: 0000000000002c0c
RBP: 0000000020000400 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000002c0c R15: 0000000000000000
</TASK>

Tested on:

commit: 9788f636 io_uring: sanitise nr_pages for SQ/CQ
git tree: https://github.com/isilence/linux.git syz/sanitise-cqsq
console output: https://syzkaller.appspot.com/x/log.txt?x=1040e778580000
kernel config: https://syzkaller.appspot.com/x/.config?x=f0635751ca15fb7a
dashboard link: https://syzkaller.appspot.com/bug?extid=2159cbb522b02847c053
compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40

Note: no patches were applied.