------------[ cut here ]------------ RTNL: assertion failed at ./include/net/netdev_lock.h (72) WARNING: ./include/net/netdev_lock.h:72 at netdev_assert_locked_ops_compat include/net/netdev_lock.h:72 [inline], CPU#3: syz.0.23/6027 WARNING: ./include/net/netdev_lock.h:72 at netdev_queue_get_dma_dev+0x52e/0x660 net/core/netdev_queues.c:43, CPU#3: syz.0.23/6027 Modules linked in: CPU: 3 UID: 0 PID: 6027 Comm: syz.0.23 Not tainted syzkaller #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 RIP: 0010:netdev_assert_locked_ops_compat include/net/netdev_lock.h:72 [inline] RIP: 0010:netdev_queue_get_dma_dev+0x53a/0x660 net/core/netdev_queues.c:43 Code: 89 c5 89 c6 e8 d7 d3 6a f8 45 85 ed 0f 85 be fb ff ff e8 59 d9 6a f8 48 8d 3d 72 e6 92 07 ba 48 00 00 00 48 c7 c6 a0 6c 18 8d <67> 48 0f b9 3a e9 9c fb ff ff e8 37 d9 6a f8 48 8d bd 00 08 00 00 RSP: 0018:ffffc90006bd7a68 EFLAGS: 00010287 RAX: 000000000000026c RBX: ffff88805d1be000 RCX: ffffc90007b71000 RDX: 0000000000000048 RSI: ffffffff8d186ca0 RDI: ffffffff9131be20 RBP: 0000000000000000 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000000000000 R11: 000000000000001e R12: 0000000000000000 R13: 0000000000000000 R14: ffff88806faa8568 R15: ffffc90006bd7bc8 FS: 0000000000000000(0000) GS:ffff888096edf000(0063) knlGS:00000000f53f6b40 CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 CR2: 00000000f721e9ea CR3: 0000000060338000 CR4: 0000000000352ef0 Call Trace: zcrx_register_netdev io_uring/zcrx.c:831 [inline] io_register_zcrx+0xe94/0x1d30 io_uring/zcrx.c:983 __io_uring_register io_uring/register.c:942 [inline] __do_sys_io_uring_register+0x1193/0x1bc0 io_uring/register.c:1040 do_syscall_32_irqs_on arch/x86/entry/syscall_32.c:83 [inline] __do_fast_syscall_32+0xe7/0x970 arch/x86/entry/syscall_32.c:307 do_fast_syscall_32+0x32/0x70 arch/x86/entry/syscall_32.c:332 entry_SYSENTER_compat_after_hwframe+0x84/0x8e RIP: 0023:0xf7f36fec Code: Unable to access opcode bytes at 0xf7f36fc2. RSP: 002b:00000000f53f650c EFLAGS: 00000292 ORIG_RAX: 00000000000001ab RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000000020 RDX: 0000000080000100 RSI: 0000000000000001 RDI: 0000000000000000 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000292 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 ---------------- Code disassembly (best guess): 0: 89 c5 mov %eax,%ebp 2: 89 c6 mov %eax,%esi 4: e8 d7 d3 6a f8 call 0xf86ad3e0 9: 45 85 ed test %r13d,%r13d c: 0f 85 be fb ff ff jne 0xfffffbd0 12: e8 59 d9 6a f8 call 0xf86ad970 17: 48 8d 3d 72 e6 92 07 lea 0x792e672(%rip),%rdi # 0x792e690 1e: ba 48 00 00 00 mov $0x48,%edx 23: 48 c7 c6 a0 6c 18 8d mov $0xffffffff8d186ca0,%rsi * 2a: 67 48 0f b9 3a ud1 (%edx),%rdi <-- trapping instruction 2f: e9 9c fb ff ff jmp 0xfffffbd0 34: e8 37 d9 6a f8 call 0xf86ad970 39: 48 8d bd 00 08 00 00 lea 0x800(%rbp),%rdi