Oops: general protection fault, probably for non-canonical address 0xdffffc0000000021: 0000 [#1] SMP KASAN PTI KASAN: null-ptr-deref in range [0x0000000000000108-0x000000000000010f] CPU: 1 UID: 0 PID: 5482 Comm: dhcpcd Not tainted 6.15.0-syzkaller-03589-gfeacb1774bd5 #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 RIP: 0010:read_pnet include/net/net_namespace.h:409 [inline] RIP: 0010:dev_net include/linux/netdevice.h:2708 [inline] RIP: 0010:ip_mc_reset net/ipv4/igmp.c:1846 [inline] RIP: 0010:ip_mc_up+0x76/0x300 net/ipv4/igmp.c:1879 Code: 89 d8 48 c1 e8 03 42 80 3c 20 00 74 08 48 89 df e8 3f a7 3e f8 41 be 08 01 00 00 4c 03 33 e8 b1 1e 75 01 4c 89 f0 48 c1 e8 03 <42> 80 3c 20 00 74 08 4c 89 f7 e8 1b a7 3e f8 4d 8b 36 48 8d bb 98 RSP: 0018:ffffc90003bcf6d0 EFLAGS: 00010206 RAX: 0000000000000021 RBX: ffff8880330a5800 RCX: ffff88802eae5a00 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000 RBP: 0000000000000001 R08: ffffffff8f2f36a7 R09: 1ffffffff1e5e6d4 R10: dffffc0000000000 R11: fffffbfff1e5e6d5 R12: dffffc0000000000 R13: dffffc0000000000 R14: 0000000000000108 R15: 0000000000000001 FS: 00007f84ecda4740(0000) GS:ffff8881261c0000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f9187e00000 CR3: 00000000217ac000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: inetdev_event+0xfb3/0x15b0 net/ipv4/devinet.c:1631 notifier_call_chain+0x1b6/0x3e0 kernel/notifier.c:85 call_netdevice_notifiers_extack net/core/dev.c:2214 [inline] call_netdevice_notifiers net/core/dev.c:2228 [inline] __dev_notify_flags+0x18d/0x2e0 net/core/dev.c:-1 netif_change_flags+0xe8/0x1a0 net/core/dev.c:9422 dev_change_flags+0x130/0x260 net/core/dev_api.c:68 devinet_ioctl+0xbb4/0x1b50 net/ipv4/devinet.c:1200 inet_ioctl+0x3c0/0x4c0 net/ipv4/af_inet.c:1001 sock_do_ioctl+0xd9/0x300 net/socket.c:1190 sock_ioctl+0x576/0x790 net/socket.c:1311 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:907 [inline] __se_sys_ioctl+0xf9/0x170 fs/ioctl.c:893 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: 0033:0x7f84ecea4378 Code: 00 00 48 8d 44 24 08 48 89 54 24 e0 48 89 44 24 c0 48 8d 44 24 d0 48 89 44 24 c8 b8 10 00 00 00 c7 44 24 b8 10 00 00 00 0f 05 <89> c2 3d 00 f0 ff ff 77 07 89 d0 c3 0f 1f 40 00 48 8b 15 49 3a 0d RSP: 002b:00007ffd5c4009c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 000000000000001a RCX: 00007f84ecea4378 RDX: 00007ffd5c410bc0 RSI: 0000000000008914 RDI: 000000000000001a RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffd5c420d60 R13: 00007f84ecda46c8 R14: 0000000000000028 R15: 0000000000008914 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:read_pnet include/net/net_namespace.h:409 [inline] RIP: 0010:dev_net include/linux/netdevice.h:2708 [inline] RIP: 0010:ip_mc_reset net/ipv4/igmp.c:1846 [inline] RIP: 0010:ip_mc_up+0x76/0x300 net/ipv4/igmp.c:1879 Code: 89 d8 48 c1 e8 03 42 80 3c 20 00 74 08 48 89 df e8 3f a7 3e f8 41 be 08 01 00 00 4c 03 33 e8 b1 1e 75 01 4c 89 f0 48 c1 e8 03 <42> 80 3c 20 00 74 08 4c 89 f7 e8 1b a7 3e f8 4d 8b 36 48 8d bb 98 RSP: 0018:ffffc90003bcf6d0 EFLAGS: 00010206 RAX: 0000000000000021 RBX: ffff8880330a5800 RCX: ffff88802eae5a00 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000 RBP: 0000000000000001 R08: ffffffff8f2f36a7 R09: 1ffffffff1e5e6d4 R10: dffffc0000000000 R11: fffffbfff1e5e6d5 R12: dffffc0000000000 R13: dffffc0000000000 R14: 0000000000000108 R15: 0000000000000001 FS: 00007f84ecda4740(0000) GS:ffff8881261c0000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b31206ff8 CR3: 00000000217ac000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 89 d8 mov %ebx,%eax 2: 48 c1 e8 03 shr $0x3,%rax 6: 42 80 3c 20 00 cmpb $0x0,(%rax,%r12,1) b: 74 08 je 0x15 d: 48 89 df mov %rbx,%rdi 10: e8 3f a7 3e f8 call 0xf83ea754 15: 41 be 08 01 00 00 mov $0x108,%r14d 1b: 4c 03 33 add (%rbx),%r14 1e: e8 b1 1e 75 01 call 0x1751ed4 23: 4c 89 f0 mov %r14,%rax 26: 48 c1 e8 03 shr $0x3,%rax * 2a: 42 80 3c 20 00 cmpb $0x0,(%rax,%r12,1) <-- trapping instruction 2f: 74 08 je 0x39 31: 4c 89 f7 mov %r14,%rdi 34: e8 1b a7 3e f8 call 0xf83ea754 39: 4d 8b 36 mov (%r14),%r14 3c: 48 rex.W 3d: 8d .byte 0x8d 3e: bb .byte 0xbb 3f: 98 cwtl