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: 12 Comm: kworker/u8:0 Not tainted 6.16.0-syzkaller-12108-gc04fdca8a98a #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+0x18f/0x580 net/ipv6/mcast.c:2593 Code: ff ff ff e8 13 d6 41 01 89 c5 31 ff 89 c6 e8 08 cb 88 f7 85 ed 74 45 e8 bf c6 88 f7 eb 05 e8 b8 c6 88 f7 4c 89 e0 48 c1 e8 03 <42> 80 3c 28 00 74 08 4c 89 e7 e8 42 31 ec f7 49 8b 2c 24 49 8d 7c RSP: 0018:ffffc900001173b0 EFLAGS: 00010206 RAX: 000000001fffe000 RBX: 1ffff1100b5e1e02 RCX: ffff88801cecda00 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000 RBP: 0000000000000001 R08: ffffffff8fa34637 R09: 1ffffffff1f468c6 R10: dffffc0000000000 R11: fffffbfff1f468c7 R12: 00000000ffff0000 R13: dffffc0000000000 R14: 0000000000000538 R15: ffff88805af0f010 FS: 0000000000000000(0000) GS:ffff888125d21000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f51c45b4000 CR3: 0000000078746000 CR4: 00000000003526f0 Call Trace: __ipv6_dev_mc_dec+0x2e4/0x330 net/ipv6/mcast.c:1009 ipv6_dev_mc_dec+0x30/0xc0 net/ipv6/mcast.c:1033 br_ip6_multicast_leave_snoopers net/bridge/br_multicast.c:4214 [inline] br_multicast_leave_snoopers+0x15a/0x1c0 net/bridge/br_multicast.c:4225 br_dev_stop+0x8a/0x180 net/bridge/br_device.c:197 __dev_close_many+0x364/0x6f0 net/core/dev.c:1755 netif_close_many+0x225/0x410 net/core/dev.c:1780 unregister_netdevice_many_notify+0x7b9/0x1ff0 net/core/dev.c:12124 ops_exit_rtnl_list net/core/net_namespace.c:186 [inline] ops_undo_list+0x3dc/0x990 net/core/net_namespace.c:247 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+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+0x18f/0x580 net/ipv6/mcast.c:2593 Code: ff ff ff e8 13 d6 41 01 89 c5 31 ff 89 c6 e8 08 cb 88 f7 85 ed 74 45 e8 bf c6 88 f7 eb 05 e8 b8 c6 88 f7 4c 89 e0 48 c1 e8 03 <42> 80 3c 28 00 74 08 4c 89 e7 e8 42 31 ec f7 49 8b 2c 24 49 8d 7c RSP: 0018:ffffc900001173b0 EFLAGS: 00010206 RAX: 000000001fffe000 RBX: 1ffff1100b5e1e02 RCX: ffff88801cecda00 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000 RBP: 0000000000000001 R08: ffffffff8fa34637 R09: 1ffffffff1f468c6 R10: dffffc0000000000 R11: fffffbfff1f468c7 R12: 00000000ffff0000 R13: dffffc0000000000 R14: 0000000000000538 R15: ffff88805af0f010 FS: 0000000000000000(0000) GS:ffff888125c21000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f51c4287e9c CR3: 0000000078746000 CR4: 00000000003526f0 ---------------- Code disassembly (best guess), 3 bytes skipped: 0: e8 13 d6 41 01 call 0x141d618 5: 89 c5 mov %eax,%ebp 7: 31 ff xor %edi,%edi 9: 89 c6 mov %eax,%esi b: e8 08 cb 88 f7 call 0xf788cb18 10: 85 ed test %ebp,%ebp 12: 74 45 je 0x59 14: e8 bf c6 88 f7 call 0xf788c6d8 19: eb 05 jmp 0x20 1b: e8 b8 c6 88 f7 call 0xf788c6d8 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 42 31 ec f7 call 0xf7ec3178 36: 49 8b 2c 24 mov (%r12),%rbp 3a: 49 rex.WB 3b: 8d .byte 0x8d 3c: 7c .byte 0x7c