BUG: kernel NULL pointer dereference, address: 0000000000000000 #PF: supervisor instruction fetch in kernel mode #PF: error_code(0x0010) - not-present page PGD 182b9e067 P4D 182b9e067 PUD 1ae7ea067 PMD 0 Oops: 0010 [#1] PREEMPT SMP KASAN CPU: 1 PID: 25025 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:ffffc9002836f910 EFLAGS: 00010246 RAX: 1ffffffff10b0c5b RBX: dffffc0000000000 RCX: ffff8881b2e02e08 RDX: 0000000000000077 RSI: 0000000020000240 RDI: ffff888096a90500 RBP: 0000000020000240 R08: 0000000000000001 R09: ffff8881cbf34ac8 R10: 0000000000000000 R11: 0000000000000000 R12: ffffc9002836fa28 R13: ffffffff885862c0 R14: 0000000000000077 R15: 0000000000000001 FS: 0000000000000000(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffffffffffffd6 CR3: 00000001fce14000 CR4: 00000000001526e0 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 6a4431cd65e93b4e ]--- RIP: 0010:0x0 Code: Bad RIP value. RSP: 0018:ffffc9002836f910 EFLAGS: 00010246 RAX: 1ffffffff10b0c5b RBX: dffffc0000000000 RCX: ffff8881b2e02e08 RDX: 0000000000000077 RSI: 0000000020000240 RDI: ffff888096a90500 RBP: 0000000020000240 R08: 0000000000000001 R09: ffff8881cbf34ac8 R10: 0000000000000000 R11: 0000000000000000 R12: ffffc9002836fa28 R13: ffffffff885862c0 R14: 0000000000000077 R15: 0000000000000001 FS: 0000000000000000(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b2fb21000 CR3: 00000001fce14000 CR4: 00000000001526e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400