[io-uring?] general protection fault in io_queue_sqe_fallback

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: 38d2b86a665b Add linux-next specific files for 20230208
git tree: linux-next
console output: https://syzkaller.appspot.com/x/log.txt?x=10abc210c80000
kernel config: https://syzkaller.appspot.com/x/.config?x=3691b32dd4410e01
dashboard link: https://syzkaller.appspot.com/bug?extid=5ad02341d77d51814554
compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2
CC: [asml.s...@gmail.com ax...@kernel.dk io-u...@vger.kernel.org linux-...@vger.kernel.org]

Unfortunately, I don't have any reproducer for this issue yet.

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/0a9d60e90514/disk-38d2b86a.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/71311be5f1a1/vmlinux-38d2b86a.xz
kernel image: https://storage.googleapis.com/syzbot-assets/a242870cc8eb/bzImage-38d2b86a.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+5ad023...@syzkaller.appspotmail.com

general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]
CPU: 0 PID: 8440 Comm: syz-executor.5 Not tainted 6.2.0-rc7-next-20230208-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/21/2023
RIP: 0010:io_queue_sqe_fallback+0xc1/0xb20 io_uring/io_uring.c:2110
Code: 4c 89 f2 48 c1 ea 03 80 3c 02 00 0f 85 01 09 00 00 48 b8 00 00 00 00 00 fc ff df 48 8b 5d 58 4c 8d 6b 04 4c 89 ea 48 c1 ea 03 <0f> b6 04 02 4c 89 ea 83 e2 07 38 d0 7f 08 84 c0 0f 85 6a 06 00 00
RSP: 0018:ffffc9000abc7c80 EFLAGS: 00010247
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffc9000ef55000
RDX: 0000000000000000 RSI: ffffffff8410f659 RDI: 0000000000000005
RBP: ffff8880765b2780 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffff8880765b27c4
R13: 0000000000000004 R14: ffff8880765b27d8 R15: 0000000000000003
FS: 00007f19d6363700(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fdc2a7a8000 CR3: 00000000202cb000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<TASK>
io_submit_state_end io_uring/io_uring.c:2352 [inline]
io_submit_sqes+0x19ea/0x1f20 io_uring/io_uring.c:2465
__do_sys_io_uring_enter+0x975/0x2810 io_uring/io_uring.c:3458
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f19d568c0f9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 19 00 00 90 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 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f19d6363168 EFLAGS: 00000246 ORIG_RAX: 00000000000001aa
RAX: ffffffffffffffda RBX: 00007f19d57ac050 RCX: 00007f19d568c0f9
RDX: 0000000000080000 RSI: 00000000000006cc RDI: 0000000000000003
RBP: 00007f19d56e7ae9 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffceee462cf R14: 00007f19d6363300 R15: 0000000000022000
</TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:io_queue_sqe_fallback+0xc1/0xb20 io_uring/io_uring.c:2110
Code: 4c 89 f2 48 c1 ea 03 80 3c 02 00 0f 85 01 09 00 00 48 b8 00 00 00 00 00 fc ff df 48 8b 5d 58 4c 8d 6b 04 4c 89 ea 48 c1 ea 03 <0f> b6 04 02 4c 89 ea 83 e2 07 38 d0 7f 08 84 c0 0f 85 6a 06 00 00
RSP: 0018:ffffc9000abc7c80 EFLAGS: 00010247
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffc9000ef55000
RDX: 0000000000000000 RSI: ffffffff8410f659 RDI: 0000000000000005
RBP: ffff8880765b2780 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffff8880765b27c4
R13: 0000000000000004 R14: ffff8880765b27d8 R15: 0000000000000003
FS: 00007f19d6363700(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000002011d030 CR3: 00000000202cb000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
0: 4c 89 f2 mov %r14,%rdx
3: 48 c1 ea 03 shr $0x3,%rdx
7: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1)
b: 0f 85 01 09 00 00 jne 0x912
11: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax
18: fc ff df
1b: 48 8b 5d 58 mov 0x58(%rbp),%rbx
1f: 4c 8d 6b 04 lea 0x4(%rbx),%r13
23: 4c 89 ea mov %r13,%rdx
26: 48 c1 ea 03 shr $0x3,%rdx
* 2a: 0f b6 04 02 movzbl (%rdx,%rax,1),%eax <-- trapping instruction
2e: 4c 89 ea mov %r13,%rdx
31: 83 e2 07 and $0x7,%edx
34: 38 d0 cmp %dl,%al
36: 7f 08 jg 0x40
38: 84 c0 test %al,%al
3a: 0f 85 6a 06 00 00 jne 0x6aa


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[syzbot]

Auto-closing this bug as obsolete.
Crashes did not happen for a while, no reproducer and no activity.