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: 49 Comm: kworker/u8:3 Not tainted 6.16.0-rc6-next-20250718-syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 Workqueue: netns cleanup_net RIP: 0010:ip6_mc_clear_src+0x18f/0x580 net/ipv6/mcast.c:2593 Code: ff ff ff e8 13 7b 43 01 89 c5 31 ff 89 c6 e8 88 14 8b f7 85 ed 74 45 e8 3f 10 8b f7 eb 05 e8 38 10 8b f7 4c 89 e0 48 c1 e8 03 <42> 80 3c 28 00 74 08 4c 89 e7 e8 32 60 ee f7 49 8b 2c 24 49 8d 7c RSP: 0018:ffffc90000b97340 EFLAGS: 00010206 RAX: 000000001fffe000 RBX: 1ffff1100f7d6602 RCX: ffff888020aeda00 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000 RBP: 0000000000000001 R08: ffffffff8fa2a737 R09: 1ffffffff1f454e6 R10: dffffc0000000000 R11: fffffbfff1f454e7 R12: 00000000ffff0000 R13: dffffc0000000000 R14: 0000000000000538 R15: ffff88807beb3010 FS: 0000000000000000(0000) GS:ffff888125be3000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00005555577cc808 CR3: 000000002edf0000 CR4: 00000000003526f0 Call Trace: mld_clear_delrec+0x160/0x660 net/ipv6/mcast.c:828 ipv6_mc_destroy_dev+0x45/0x5a0 net/ipv6/mcast.c:2839 addrconf_ifdown+0x139e/0x1880 net/ipv6/addrconf.c:3991 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] unregister_netdevice_many_notify+0x14d7/0x1ff0 net/core/dev.c:12130 unregister_netdevice_many net/core/dev.c:12193 [inline] default_device_exit_batch+0x819/0x890 net/core/dev.c:12697 ops_exit_list net/core/net_namespace.c:204 [inline] ops_undo_list+0x525/0x990 net/core/net_namespace.c:251 cleanup_net+0x4c5/0x800 net/core/net_namespace.c:682 process_one_work kernel/workqueue.c:3236 [inline] process_scheduled_works+0xade/0x17b0 kernel/workqueue.c:3319 worker_thread+0x8a0/0xda0 kernel/workqueue.c:3400 kthread+0x70e/0x8a0 kernel/kthread.c:463 ret_from_fork+0x3f9/0x770 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:ip6_mc_clear_src+0x18f/0x580 net/ipv6/mcast.c:2593 Code: ff ff ff e8 13 7b 43 01 89 c5 31 ff 89 c6 e8 88 14 8b f7 85 ed 74 45 e8 3f 10 8b f7 eb 05 e8 38 10 8b f7 4c 89 e0 48 c1 e8 03 <42> 80 3c 28 00 74 08 4c 89 e7 e8 32 60 ee f7 49 8b 2c 24 49 8d 7c RSP: 0018:ffffc90000b97340 EFLAGS: 00010206 RAX: 000000001fffe000 RBX: 1ffff1100f7d6602 RCX: ffff888020aeda00 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000 RBP: 0000000000000001 R08: ffffffff8fa2a737 R09: 1ffffffff1f454e6 R10: dffffc0000000000 R11: fffffbfff1f454e7 R12: 00000000ffff0000 R13: dffffc0000000000 R14: 0000000000000538 R15: ffff88807beb3010 FS: 0000000000000000(0000) GS:ffff888125be3000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000110c46e58c CR3: 000000007c6e2000 CR4: 00000000003526f0 ---------------- Code disassembly (best guess), 3 bytes skipped: 0: e8 13 7b 43 01 call 0x1437b18 5: 89 c5 mov %eax,%ebp 7: 31 ff xor %edi,%edi 9: 89 c6 mov %eax,%esi b: e8 88 14 8b f7 call 0xf78b1498 10: 85 ed test %ebp,%ebp 12: 74 45 je 0x59 14: e8 3f 10 8b f7 call 0xf78b1058 19: eb 05 jmp 0x20 1b: e8 38 10 8b f7 call 0xf78b1058 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 32 60 ee f7 call 0xf7ee6068 36: 49 8b 2c 24 mov (%r12),%rbp 3a: 49 rex.WB 3b: 8d .byte 0x8d 3c: 7c .byte 0x7c