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: 12304 Comm: syz.2.1796 Not tainted 6.16.0-rc1-syzkaller-00102-g5466491c9e33 #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 RIP: 0010:mld_clear_delrec+0x34a/0x5d0 net/ipv6/mcast.c:838 Code: ff ff ff e8 28 34 41 01 89 c5 31 ff 89 c6 e8 6d 6b 9b f7 85 ed 74 40 e8 24 67 9b f7 eb 05 e8 1d 67 9b f7 4c 89 f8 48 c1 e8 03 <42> 80 3c 28 00 74 08 4c 89 ff e8 77 de fe f7 4d 8b 27 49 8d 7f 30 RSP: 0018:ffffc90004797750 EFLAGS: 00010206 RAX: 000000001fffe000 RBX: ffff88802a539538 RCX: ffff888034f91e00 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000 RBP: 0000000000000001 R08: ffffffff8fa103f7 R09: 1ffffffff1f4207e R10: dffffc0000000000 R11: fffffbfff1f4207f R12: ffff88806d69c428 R13: dffffc0000000000 R14: ffff88806d69c400 R15: 00000000ffff0000 FS: 000055555f017500(0000) GS:ffff888125d52000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fb247ee56c0 CR3: 000000004943c000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: ipv6_mc_destroy_dev+0x45/0x5a0 net/ipv6/mcast.c:2842 addrconf_ifdown+0x139e/0x1880 net/ipv6/addrconf.c:4000 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:2268 [inline] call_netdevice_notifiers net/core/dev.c:2282 [inline] unregister_netdevice_many_notify+0x15d8/0x2320 net/core/dev.c:12077 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:465 task_work_run+0x1d1/0x260 kernel/task_work.c:227 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline] exit_to_user_mode_loop+0xec/0x110 kernel/entry/common.c:114 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: 0033:0x7ff52878e929 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:00007fff2675bc98 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4 RAX: 0000000000000000 RBX: 00007ff5289b7ba0 RCX: 00007ff52878e929 RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003 RBP: 00007ff5289b7ba0 R08: 0000000000000128 R09: 000000112675bf8f R10: 00007ff5289b7ac0 R11: 0000000000000246 R12: 000000000004d789 R13: 00007ff5289b6080 R14: ffffffffffffffff R15: 00007fff2675bdb0 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:mld_clear_delrec+0x34a/0x5d0 net/ipv6/mcast.c:838 Code: ff ff ff e8 28 34 41 01 89 c5 31 ff 89 c6 e8 6d 6b 9b f7 85 ed 74 40 e8 24 67 9b f7 eb 05 e8 1d 67 9b f7 4c 89 f8 48 c1 e8 03 <42> 80 3c 28 00 74 08 4c 89 ff e8 77 de fe f7 4d 8b 27 49 8d 7f 30 RSP: 0018:ffffc90004797750 EFLAGS: 00010206 RAX: 000000001fffe000 RBX: ffff88802a539538 RCX: ffff888034f91e00 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000 RBP: 0000000000000001 R08: ffffffff8fa103f7 R09: 1ffffffff1f4207e R10: dffffc0000000000 R11: fffffbfff1f4207f R12: ffff88806d69c428 R13: dffffc0000000000 R14: ffff88806d69c400 R15: 00000000ffff0000 FS: 000055555f017500(0000) GS:ffff888125d52000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f9b13571f98 CR3: 000000004943c000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess), 3 bytes skipped: 0: e8 28 34 41 01 call 0x141342d 5: 89 c5 mov %eax,%ebp 7: 31 ff xor %edi,%edi 9: 89 c6 mov %eax,%esi b: e8 6d 6b 9b f7 call 0xf79b6b7d 10: 85 ed test %ebp,%ebp 12: 74 40 je 0x54 14: e8 24 67 9b f7 call 0xf79b673d 19: eb 05 jmp 0x20 1b: e8 1d 67 9b f7 call 0xf79b673d 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 77 de fe f7 call 0xf7fedead 36: 4d 8b 27 mov (%r15),%r12 39: 49 8d 7f 30 lea 0x30(%r15),%rdi