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: 13 Comm: kworker/u8:1 Not tainted 6.16.0-syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025 Workqueue: netns cleanup_net RIP: 0010:ip6_mc_clear_src+0x119/0x4e0 net/ipv6/mcast.c:2599 Code: ff ff ff e8 49 fe 41 01 89 c5 31 ff 89 c6 e8 4e 9c 9b f7 85 ed 74 45 e8 05 98 9b f7 eb 05 e8 fe 97 9b f7 4c 89 e0 48 c1 e8 03 <42> 80 3c 28 00 74 08 4c 89 e7 e8 28 7f fb f7 49 8b 2c 24 49 8d 7c RSP: 0018:ffffc900001272e0 EFLAGS: 00010206 RAX: 000000001fffe000 RBX: 1ffff11006666d02 RCX: ffff88801d2a8000 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000 RBP: 0000000000000001 R08: ffffffff8fa0b3f7 R09: 1ffffffff1f4167e R10: dffffc0000000000 R11: fffffbfff1f4167f R12: 00000000ffff0000 R13: dffffc0000000000 R14: 0000000000000538 R15: ffff888033336810 FS: 0000000000000000(0000) GS:ffff888125d57000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000200000046000 CR3: 00000000347e8000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000004144 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 Call Trace: mld_clear_delrec+0x105/0x5d0 net/ipv6/mcast.c:826 ipv6_mc_destroy_dev+0x45/0x5a0 net/ipv6/mcast.c:2842 addrconf_ifdown+0x139e/0x1880 net/ipv6/addrconf.c:3995 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] default_device_exit_batch+0x819/0x890 net/core/dev.c:12644 ops_exit_list net/core/net_namespace.c:206 [inline] ops_undo_list+0x522/0x990 net/core/net_namespace.c:253 cleanup_net+0x4c5/0x800 net/core/net_namespace.c:686 process_one_work kernel/workqueue.c:3238 [inline] process_scheduled_works+0xade/0x17b0 kernel/workqueue.c:3321 worker_thread+0x8a0/0xda0 kernel/workqueue.c:3402 kthread+0x70e/0x8a0 kernel/kthread.c:464 ret_from_fork+0x3fc/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+0x119/0x4e0 net/ipv6/mcast.c:2599 Code: ff ff ff e8 49 fe 41 01 89 c5 31 ff 89 c6 e8 4e 9c 9b f7 85 ed 74 45 e8 05 98 9b f7 eb 05 e8 fe 97 9b f7 4c 89 e0 48 c1 e8 03 <42> 80 3c 28 00 74 08 4c 89 e7 e8 28 7f fb f7 49 8b 2c 24 49 8d 7c RSP: 0018:ffffc900001272e0 EFLAGS: 00010206 RAX: 000000001fffe000 RBX: 1ffff11006666d02 RCX: ffff88801d2a8000 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000 RBP: 0000000000000001 R08: ffffffff8fa0b3f7 R09: 1ffffffff1f4167e R10: dffffc0000000000 R11: fffffbfff1f4167f R12: 00000000ffff0000 R13: dffffc0000000000 R14: 0000000000000538 R15: ffff888033336810 FS: 0000000000000000(0000) GS:ffff888125d57000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000200000048000 CR3: 00000000347e8000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000004144 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess), 3 bytes skipped: 0: e8 49 fe 41 01 call 0x141fe4e 5: 89 c5 mov %eax,%ebp 7: 31 ff xor %edi,%edi 9: 89 c6 mov %eax,%esi b: e8 4e 9c 9b f7 call 0xf79b9c5e 10: 85 ed test %ebp,%ebp 12: 74 45 je 0x59 14: e8 05 98 9b f7 call 0xf79b981e 19: eb 05 jmp 0x20 1b: e8 fe 97 9b f7 call 0xf79b981e 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 7f fb f7 call 0xf7fb7f5e 36: 49 8b 2c 24 mov (%r12),%rbp 3a: 49 rex.WB 3b: 8d .byte 0x8d 3c: 7c .byte 0x7c