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: 1 UID: 0 PID: 10899 Comm: syz-executor Not tainted 6.16.0-next-20250731-syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025 RIP: 0010:ip6_mc_clear_src+0x18f/0x580 net/ipv6/mcast.c:2593 Code: ff ff ff e8 f3 d6 41 01 89 c5 31 ff 89 c6 e8 f8 62 8a f7 85 ed 74 45 e8 af 5e 8a f7 eb 05 e8 a8 5e 8a f7 4c 89 e0 48 c1 e8 03 <42> 80 3c 28 00 74 08 4c 89 e7 e8 92 bd ed f7 49 8b 2c 24 49 8d 7c RSP: 0018:ffffc9000b027318 EFLAGS: 00010206 RAX: 000000001fffe000 RBX: 1ffff1100c2e7982 RCX: ffff8880267cda00 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000 RBP: 0000000000000001 R08: ffffffff8fa21837 R09: 1ffffffff1f44306 R10: dffffc0000000000 R11: fffffbfff1f44307 R12: 00000000ffff0000 R13: dffffc0000000000 R14: 0000000000000538 R15: ffff88806173cc10 FS: 0000000000000000(0000) GS:ffff888125d43000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fadc7692851 CR3: 0000000059442000 CR4: 00000000003526f0 Call Trace: __ipv6_dev_mc_dec+0x2e4/0x330 net/ipv6/mcast.c:1009 addrconf_leave_solict net/ipv6/addrconf.c:2257 [inline] __ipv6_ifa_notify+0x43d/0xac0 net/ipv6/addrconf.c:6299 addrconf_ifdown+0xe69/0x1880 net/ipv6/addrconf.c:3977 addrconf_notify+0x1bc/0x1010 net/ipv6/addrconf.c:-1 notifier_call_chain+0x1b6/0x3e0 kernel/notifier.c:85 call_netdevice_notifiers_extack net/core/dev.c:2267 [inline] call_netdevice_notifiers net/core/dev.c:2281 [inline] netif_close_many+0x29c/0x410 net/core/dev.c:1784 unregister_netdevice_many_notify+0x7b9/0x1ff0 net/core/dev.c:12126 unregister_netdevice_many net/core/dev.c:12219 [inline] unregister_netdevice_queue+0x33c/0x380 net/core/dev.c:12063 unregister_netdevice include/linux/netdevice.h:3382 [inline] __tun_detach+0xda4/0x1560 drivers/net/tun.c:621 tun_detach drivers/net/tun.c:637 [inline] tun_chr_close+0x10a/0x1c0 drivers/net/tun.c:3433 __fput+0x449/0xa70 fs/file_table.c:468 task_work_run+0x1d4/0x260 kernel/task_work.c:227 exit_task_work include/linux/task_work.h:40 [inline] do_exit+0x6b5/0x2300 kernel/exit.c:961 do_group_exit+0x21c/0x2d0 kernel/exit.c:1102 __do_sys_exit_group kernel/exit.c:1113 [inline] __se_sys_exit_group kernel/exit.c:1111 [inline] __x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1111 x64_sys_call+0x21f7/0x2200 arch/x86/include/generated/asm/syscalls_64.h:232 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: 0033:0x7fefbe18eb69 Code: Unable to access opcode bytes at 0x7fefbe18eb3f. RSP: 002b:00007ffd68d58308 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 RAX: ffffffffffffffda RBX: 00007fefbe211c61 RCX: 00007fefbe18eb69 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000001 RBP: 0000000000000016 R08: 00007ffd68d560a6 R09: 00007ffd68d595c0 R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffd68d595c0 R13: 00007fefbe211bdd R14: 00005555864e44a8 R15: 00007ffd68d5b780 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:ip6_mc_clear_src+0x18f/0x580 net/ipv6/mcast.c:2593 Code: ff ff ff e8 f3 d6 41 01 89 c5 31 ff 89 c6 e8 f8 62 8a f7 85 ed 74 45 e8 af 5e 8a f7 eb 05 e8 a8 5e 8a f7 4c 89 e0 48 c1 e8 03 <42> 80 3c 28 00 74 08 4c 89 e7 e8 92 bd ed f7 49 8b 2c 24 49 8d 7c RSP: 0018:ffffc9000b027318 EFLAGS: 00010206 RAX: 000000001fffe000 RBX: 1ffff1100c2e7982 RCX: ffff8880267cda00 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000 RBP: 0000000000000001 R08: ffffffff8fa21837 R09: 1ffffffff1f44306 R10: dffffc0000000000 R11: fffffbfff1f44307 R12: 00000000ffff0000 R13: dffffc0000000000 R14: 0000000000000538 R15: ffff88806173cc10 FS: 0000000000000000(0000) GS:ffff888125c43000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000110c36fbef CR3: 000000007edbc000 CR4: 00000000003526f0 ---------------- Code disassembly (best guess), 3 bytes skipped: 0: e8 f3 d6 41 01 call 0x141d6f8 5: 89 c5 mov %eax,%ebp 7: 31 ff xor %edi,%edi 9: 89 c6 mov %eax,%esi b: e8 f8 62 8a f7 call 0xf78a6308 10: 85 ed test %ebp,%ebp 12: 74 45 je 0x59 14: e8 af 5e 8a f7 call 0xf78a5ec8 19: eb 05 jmp 0x20 1b: e8 a8 5e 8a f7 call 0xf78a5ec8 20: 4c 89 e0 mov %r12,%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 e7 mov %r12,%rdi 31: e8 92 bd ed f7 call 0xf7edbdc8 36: 49 8b 2c 24 mov (%r12),%rbp 3a: 49 rex.WB 3b: 8d .byte 0x8d 3c: 7c .byte 0x7c