Hello, syzbot found the following issue on: HEAD commit: 029f56db Merge tag 'x86_asm_for_v5.10' of git://git.kernel.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=1421c89b900000 kernel config: https://syzkaller.appspot.com/x/.config?x=c5327fbeef7650a dashboard link: https://syzkaller.appspot.com/bug?extid=4520eff3d84059553f13 compiler: clang version 10.0.0 (https://github.com/llvm/llvm-project/ c2443155a0fb245c8f17f2c1c72b6ea391e86e81) Unfortunately, I don't have any reproducer for this issue yet. IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+4520eff3d84059553f13@xxxxxxxxxxxxxxxxxxxxxxxxx general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] PREEMPT SMP KASAN KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007] CPU: 1 PID: 8347 Comm: syz-executor.3 Not tainted 5.9.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:io_file_from_index fs/io_uring.c:5963 [inline] RIP: 0010:io_sqe_files_register fs/io_uring.c:7369 [inline] RIP: 0010:__io_uring_register fs/io_uring.c:9463 [inline] RIP: 0010:__do_sys_io_uring_register fs/io_uring.c:9553 [inline] RIP: 0010:__se_sys_io_uring_register+0x3343/0x3ea0 fs/io_uring.c:9535 Code: ff df 48 8b 5c 24 18 42 80 3c 23 00 48 8b 6c 24 60 74 08 48 89 ef e8 bc 36 e0 ff 41 8d 5e ff 4c 8b 7d 00 4c 89 f8 48 c1 e8 03 <42> 80 3c 20 00 74 08 4c 89 ff e8 9e 36 e0 ff 89 d8 c1 f8 09 48 63 RSP: 0018:ffffc9001633fdc0 EFLAGS: 00010246 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 1ffff11011eb5638 RDX: ffff888051844080 RSI: 0000000000000001 RDI: 0000000000000000 RBP: ffff88808f5ab1b8 R08: ffffffff81d56c63 R09: ffffed1012046ab8 R10: ffffed1012046ab8 R11: 0000000000000000 R12: dffffc0000000000 R13: 00000000fffffff7 R14: 0000000000000001 R15: 0000000000000000 FS: 00007f5b96b14700(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000768000 CR3: 000000009ed9c000 CR4: 00000000001506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: do_syscall_64+0x31/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45de59 Code: 0d b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 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 0f 83 db b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f5b96b13c78 EFLAGS: 00000246 ORIG_RAX: 00000000000001ab RAX: ffffffffffffffda RBX: 00000000000083c0 RCX: 000000000045de59 RDX: 0000000020000040 RSI: 0000000000000002 RDI: 0000000000000003 RBP: 000000000118bf68 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000002 R11: 0000000000000246 R12: 000000000118bf2c R13: 00007ffcf7ec75bf R14: 00007f5b96b149c0 R15: 000000000118bf2c Modules linked in: ---[ end trace ae2cc3c0d259d867 ]--- RIP: 0010:io_file_from_index fs/io_uring.c:5963 [inline] RIP: 0010:io_sqe_files_register fs/io_uring.c:7369 [inline] RIP: 0010:__io_uring_register fs/io_uring.c:9463 [inline] RIP: 0010:__do_sys_io_uring_register fs/io_uring.c:9553 [inline] RIP: 0010:__se_sys_io_uring_register+0x3343/0x3ea0 fs/io_uring.c:9535 Code: ff df 48 8b 5c 24 18 42 80 3c 23 00 48 8b 6c 24 60 74 08 48 89 ef e8 bc 36 e0 ff 41 8d 5e ff 4c 8b 7d 00 4c 89 f8 48 c1 e8 03 <42> 80 3c 20 00 74 08 4c 89 ff e8 9e 36 e0 ff 89 d8 c1 f8 09 48 63 RSP: 0018:ffffc9001633fdc0 EFLAGS: 00010246 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 1ffff11011eb5638 RDX: ffff888051844080 RSI: 0000000000000001 RDI: 0000000000000000 RBP: ffff88808f5ab1b8 R08: ffffffff81d56c63 R09: ffffed1012046ab8 R10: ffffed1012046ab8 R11: 0000000000000000 R12: dffffc0000000000 R13: 00000000fffffff7 R14: 0000000000000001 R15: 0000000000000000 FS: 00007f5b96b14700(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000768000 CR3: 000000009ed9c000 CR4: 00000000001506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@xxxxxxxxxxxxxxxx. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
