Hello, syzbot found the following issue on: HEAD commit: 9420f1ce Merge tag 'pinctrl-v5.9-1' of git://git.kernel.or.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=13662f62900000 kernel config: https://syzkaller.appspot.com/x/.config?x=72cf85e4237850c8 dashboard link: https://syzkaller.appspot.com/bug?extid=1abbd16e49910f6bbe45 compiler: gcc (GCC) 10.1.0-syz 20200507 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=15929006900000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=15e196aa900000 IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+1abbd16e49910f6bbe45@xxxxxxxxxxxxxxxxxxxxxxxxx BUG: kernel NULL pointer dereference, address: 0000000000000000 #PF: supervisor instruction fetch in kernel mode #PF: error_code(0x0010) - not-present page PGD a652e067 P4D a652e067 PUD a652f067 PMD 0 Oops: 0010 [#1] PREEMPT SMP KASAN CPU: 1 PID: 7461 Comm: io_wqe_worker-0 Not tainted 5.8.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:0x0 Code: Bad RIP value. RSP: 0018:ffffc9000804f910 EFLAGS: 00010246 RAX: 1ffffffff10b0b9b RBX: dffffc0000000000 RCX: ffff88808962e1c8 RDX: 000000000000003c RSI: 0000000020000740 RDI: ffff88809fb2dcc0 RBP: 0000000020000740 R08: ffffc9000804fa28 R09: ffff8880a7639c0f R10: 0000000000000000 R11: 0000000000000000 R12: ffffc9000804fa28 R13: ffffffff88585cc0 R14: 000000000000003c R15: 0000000000000001 FS: 0000000000000000(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffffffffffffd6 CR3: 000000008e2a7000 CR4: 00000000001506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: loop_rw_iter.part.0+0x26e/0x450 fs/io_uring.c:2850 loop_rw_iter fs/io_uring.c:2829 [inline] io_write+0x6a2/0x7a0 fs/io_uring.c:3190 io_issue_sqe+0x1b0/0x60d0 fs/io_uring.c:5530 io_wq_submit_work+0x183/0x3d0 fs/io_uring.c:5775 io_worker_handle_work+0xa45/0x13f0 fs/io-wq.c:527 io_wqe_worker+0xbf0/0x10e0 fs/io-wq.c:569 kthread+0x3b5/0x4a0 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 Modules linked in: CR2: 0000000000000000 ---[ end trace 97e511c5a98da2fe ]--- RIP: 0010:0x0 Code: Bad RIP value. RSP: 0018:ffffc9000804f910 EFLAGS: 00010246 RAX: 1ffffffff10b0b9b RBX: dffffc0000000000 RCX: ffff88808962e1c8 RDX: 000000000000003c RSI: 0000000020000740 RDI: ffff88809fb2dcc0 RBP: 0000000020000740 R08: ffffc9000804fa28 R09: ffff8880a7639c0f R10: 0000000000000000 R11: 0000000000000000 R12: ffffc9000804fa28 R13: ffffffff88585cc0 R14: 000000000000003c R15: 0000000000000001 FS: 0000000000000000(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f84c3b15028 CR3: 000000008e2a7000 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. syzbot can test patches for this issue, for details see: https://goo.gl/tpsmEJ#testing-patches
