netdevsim netdevsim4 netdevsim3 (unregistering): unset [0, 0] type 1 family 0 port 8472 - 0 netdevsim netdevsim4 netdevsim3 (unregistering): unset [1, 0] type 2 family 0 port 6081 - 0 Oops: general protection fault, probably for non-canonical address 0xdffffc001fffe000: 0000 [#1] SMP KASAN PTI KASAN: probably user-memory-access in range [0x00000000ffff0000-0x00000000ffff0007] CPU: 0 UID: 0 PID: 21740 Comm: syz.4.4504 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025 RIP: 0010:mld_clear_delrec+0x3a5/0x660 net/ipv6/mcast.c:840 Code: ff ff ff e8 cd 32 41 01 89 c5 31 ff 89 c6 e8 42 78 87 f7 85 ed 74 40 e8 f9 73 87 f7 eb 05 e8 f2 73 87 f7 4c 89 f8 48 c1 e8 03 <42> 80 3c 28 00 74 08 4c 89 ff e8 2c dd ea f7 4d 8b 27 49 8d 7f 30 RSP: 0018:ffffc90012a2eb70 EFLAGS: 00010206 RAX: 000000001fffe000 RBX: ffff8880442ce538 RCX: 0000000000080000 RDX: ffffc9001c692000 RSI: 000000000001b5c8 RDI: 000000000001b5c9 RBP: 0000000000000001 R08: ffffffff8fa37e37 R09: 1ffffffff1f46fc6 R10: dffffc0000000000 R11: fffffbfff1f46fc7 R12: ffff888055e6a028 R13: dffffc0000000000 R14: ffff888055e6a000 R15: 00000000ffff0000 FS: 00007f6f9029d6c0(0000) GS:ffff888125c1b000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f700529ffe8 CR3: 0000000031fcc000 CR4: 00000000003526f0 Call Trace: ipv6_mc_destroy_dev+0x45/0x5a0 net/ipv6/mcast.c:2839 addrconf_ifdown+0x139e/0x1880 net/ipv6/addrconf.c:3996 addrconf_notify+0x1bc/0x1010 net/ipv6/addrconf.c:-1 notifier_call_chain+0x1b3/0x3e0 kernel/notifier.c:85 call_netdevice_notifiers_extack net/core/dev.c:2267 [inline] call_netdevice_notifiers net/core/dev.c:2281 [inline] unregister_netdevice_many_notify+0x14d7/0x1ff0 net/core/dev.c:12166 unregister_netdevice_many net/core/dev.c:12229 [inline] unregister_netdevice_queue+0x33c/0x380 net/core/dev.c:12073 unregister_netdevice include/linux/netdevice.h:3385 [inline] nsim_destroy+0x1dd/0x670 drivers/net/netdevsim/netdev.c:1140 __nsim_dev_port_del+0x14d/0x1b0 drivers/net/netdevsim/dev.c:1473 nsim_dev_port_del_all drivers/net/netdevsim/dev.c:1485 [inline] nsim_dev_reload_destroy+0x288/0x490 drivers/net/netdevsim/dev.c:1707 nsim_dev_reload_down+0x8a/0xc0 drivers/net/netdevsim/dev.c:983 devlink_reload+0x1b3/0x8d0 net/devlink/dev.c:461 devlink_nl_reload_doit+0xb35/0xd50 net/devlink/dev.c:584 genl_family_rcv_msg_doit+0x215/0x300 net/netlink/genetlink.c:1115 genl_family_rcv_msg net/netlink/genetlink.c:1195 [inline] genl_rcv_msg+0x60e/0x790 net/netlink/genetlink.c:1210 netlink_rcv_skb+0x205/0x470 net/netlink/af_netlink.c:2552 genl_rcv+0x28/0x40 net/netlink/genetlink.c:1219 netlink_unicast_kernel net/netlink/af_netlink.c:1320 [inline] netlink_unicast+0x82c/0x9e0 net/netlink/af_netlink.c:1346 netlink_sendmsg+0x805/0xb30 net/netlink/af_netlink.c:1896 sock_sendmsg_nosec net/socket.c:714 [inline] __sock_sendmsg+0x219/0x270 net/socket.c:729 ____sys_sendmsg+0x505/0x830 net/socket.c:2614 ___sys_sendmsg+0x21f/0x2a0 net/socket.c:2668 __sys_sendmsg net/socket.c:2700 [inline] __do_sys_sendmsg net/socket.c:2705 [inline] __se_sys_sendmsg net/socket.c:2703 [inline] __x64_sys_sendmsg+0x19b/0x260 net/socket.c:2703 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f6f8f38ebe9 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f6f9029d038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007f6f8f5b5fa0 RCX: 00007f6f8f38ebe9 RDX: 0000000000000000 RSI: 0000200000000080 RDI: 0000000000000003 RBP: 00007f6f8f411e19 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f6f8f5b6038 R14: 00007f6f8f5b5fa0 R15: 00007ffd2ba31a38 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:mld_clear_delrec+0x3a5/0x660 net/ipv6/mcast.c:840 Code: ff ff ff e8 cd 32 41 01 89 c5 31 ff 89 c6 e8 42 78 87 f7 85 ed 74 40 e8 f9 73 87 f7 eb 05 e8 f2 73 87 f7 4c 89 f8 48 c1 e8 03 <42> 80 3c 28 00 74 08 4c 89 ff e8 2c dd ea f7 4d 8b 27 49 8d 7f 30 RSP: 0018:ffffc90012a2eb70 EFLAGS: 00010206 RAX: 000000001fffe000 RBX: ffff8880442ce538 RCX: 0000000000080000 RDX: ffffc9001c692000 RSI: 000000000001b5c8 RDI: 000000000001b5c9 RBP: 0000000000000001 R08: ffffffff8fa37e37 R09: 1ffffffff1f46fc6 R10: dffffc0000000000 R11: fffffbfff1f46fc7 R12: ffff888055e6a028 R13: dffffc0000000000 R14: ffff888055e6a000 R15: 00000000ffff0000 FS: 00007f6f9029d6c0(0000) GS:ffff888125c1b000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f7966046e9c CR3: 0000000031fcc000 CR4: 00000000003526f0 ---------------- Code disassembly (best guess), 3 bytes skipped: 0: e8 cd 32 41 01 call 0x14132d2 5: 89 c5 mov %eax,%ebp 7: 31 ff xor %edi,%edi 9: 89 c6 mov %eax,%esi b: e8 42 78 87 f7 call 0xf7877852 10: 85 ed test %ebp,%ebp 12: 74 40 je 0x54 14: e8 f9 73 87 f7 call 0xf7877412 19: eb 05 jmp 0x20 1b: e8 f2 73 87 f7 call 0xf7877412 20: 4c 89 f8 mov %r15,%rax 23: 48 c1 e8 03 shr $0x3,%rax * 27: 42 80 3c 28 00 cmpb $0x0,(%rax,%r13,1) <-- trapping instruction 2c: 74 08 je 0x36 2e: 4c 89 ff mov %r15,%rdi 31: e8 2c dd ea f7 call 0xf7eadd62 36: 4d 8b 27 mov (%r15),%r12 39: 49 8d 7f 30 lea 0x30(%r15),%rdi