Oops: general protection fault, probably for non-canonical address 0xdffffc001fff8000: 0000 [#1] SMP KASAN NOPTI KASAN: probably user-memory-access in range [0x00000000fffc0000-0x00000000fffc0007] CPU: 1 UID: 0 PID: 7768 Comm: syz-executor Not tainted 6.16.0-syzkaller-02094-g86aa72182095 #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025 RIP: 0010:ip6_mc_clear_src+0x119/0x4e0 net/ipv6/mcast.c:2599 Code: ff ff ff e8 a9 08 42 01 89 c5 31 ff 89 c6 e8 be 65 92 f7 85 ed 74 45 e8 75 61 92 f7 eb 05 e8 6e 61 92 f7 4c 89 e0 48 c1 e8 03 <42> 80 3c 28 00 74 08 4c 89 e7 e8 28 7a f4 f7 49 8b 2c 24 49 8d 7c RSP: 0018:ffffc90003ed7078 EFLAGS: 00010216 RAX: 000000001fff8000 RBX: 1ffff1100aa50f02 RCX: ffff8880307b9e00 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000 RBP: 0000000000000001 R08: ffffffff8fa05af7 R09: 1ffffffff1f40b5e R10: dffffc0000000000 R11: fffffbfff1f40b5f R12: 00000000fffc0000 R13: dffffc0000000000 R14: 0000000000000538 R15: ffff888055287810 FS: 0000000000000000(0000) GS:ffff888125d86000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000055559018e608 CR3: 0000000058be1000 CR4: 0000000000350ef0 Call Trace: __ipv6_dev_mc_dec+0x30d/0x390 net/ipv6/mcast.c:1021 addrconf_leave_solict net/ipv6/addrconf.c:2254 [inline] __ipv6_ifa_notify+0x43d/0xac0 net/ipv6/addrconf.c:6297 addrconf_ifdown+0xe69/0x1880 net/ipv6/addrconf.c:3976 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:2268 [inline] call_netdevice_notifiers net/core/dev.c:2282 [inline] dev_close_many+0x29c/0x410 net/core/dev.c:1785 unregister_netdevice_many_notify+0x834/0x2320 net/core/dev.c:12047 unregister_netdevice_many net/core/dev.c:12140 [inline] unregister_netdevice_queue+0x33c/0x380 net/core/dev.c:11984 unregister_netdevice include/linux/netdevice.h:3379 [inline] __tun_detach+0xda4/0x1560 drivers/net/tun.c:620 tun_detach drivers/net/tun.c:636 [inline] tun_chr_close+0x10a/0x1c0 drivers/net/tun.c:3396 __fput+0x44c/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+0x6b5/0x22e0 kernel/exit.c:964 do_group_exit+0x21c/0x2d0 kernel/exit.c:1105 get_signal+0x1286/0x1340 kernel/signal.c:3034 arch_do_signal_or_restart+0x9a/0x750 arch/x86/kernel/signal.c:337 exit_to_user_mode_loop+0x75/0x110 kernel/entry/common.c:111 exit_to_user_mode_prepare include/linux/entry-common.h:330 [inline] syscall_exit_to_user_mode_work include/linux/entry-common.h:414 [inline] syscall_exit_to_user_mode include/linux/entry-common.h:449 [inline] do_syscall_64+0x2bd/0x3b0 arch/x86/entry/syscall_64.c:100 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f367b19083c Code: Unable to access opcode bytes at 0x7f367b190812. RSP: 002b:00007ffc9c8b18d0 EFLAGS: 00000293 ORIG_RAX: 000000000000002c RAX: 000000000000002c RBX: 00007f367bee4620 RCX: 00007f367b19083c RDX: 000000000000002c RSI: 00007f367bee4670 RDI: 0000000000000003 RBP: 0000000000000000 R08: 00007ffc9c8b1924 R09: 000000000000000c R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000003 R13: 0000000000000000 R14: 00007f367bee4670 R15: 0000000000000000 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:ip6_mc_clear_src+0x119/0x4e0 net/ipv6/mcast.c:2599 Code: ff ff ff e8 a9 08 42 01 89 c5 31 ff 89 c6 e8 be 65 92 f7 85 ed 74 45 e8 75 61 92 f7 eb 05 e8 6e 61 92 f7 4c 89 e0 48 c1 e8 03 <42> 80 3c 28 00 74 08 4c 89 e7 e8 28 7a f4 f7 49 8b 2c 24 49 8d 7c RSP: 0018:ffffc90003ed7078 EFLAGS: 00010216 RAX: 000000001fff8000 RBX: 1ffff1100aa50f02 RCX: ffff8880307b9e00 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000 RBP: 0000000000000001 R08: ffffffff8fa05af7 R09: 1ffffffff1f40b5e R10: dffffc0000000000 R11: fffffbfff1f40b5f R12: 00000000fffc0000 R13: dffffc0000000000 R14: 0000000000000538 R15: ffff888055287810 FS: 0000000000000000(0000) GS:ffff888125d86000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000020000001a000 CR3: 000000001fbac000 CR4: 0000000000350ef0 ---------------- Code disassembly (best guess), 3 bytes skipped: 0: e8 a9 08 42 01 call 0x14208ae 5: 89 c5 mov %eax,%ebp 7: 31 ff xor %edi,%edi 9: 89 c6 mov %eax,%esi b: e8 be 65 92 f7 call 0xf79265ce 10: 85 ed test %ebp,%ebp 12: 74 45 je 0x59 14: e8 75 61 92 f7 call 0xf792618e 19: eb 05 jmp 0x20 1b: e8 6e 61 92 f7 call 0xf792618e 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 28 7a f4 f7 call 0xf7f47a5e 36: 49 8b 2c 24 mov (%r12),%rbp 3a: 49 rex.WB 3b: 8d .byte 0x8d 3c: 7c .byte 0x7c