general protection fault, probably for non-canonical address 0xdffffc00000000b4: 0000 [#1] PREEMPT SMP KASAN KASAN: null-ptr-deref in range [0x00000000000005a0-0x00000000000005a7] CPU: 0 PID: 10 Comm: kworker/u4:1 Not tainted 5.15.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: netns cleanup_net RIP: 0010:__fib6_drop_pcpu_from.part.0+0x10b/0x390 net/ipv6/ip6_fib.c:978 Code: 48 c1 ea 03 80 3c 1a 00 0f 85 19 02 00 00 4c 8b 38 4d 85 ff 0f 84 7a ff ff ff e8 20 08 99 f9 49 8d 7f 70 48 89 f8 48 c1 e8 03 <80> 3c 18 00 0f 85 4b 02 00 00 49 8b 47 70 48 3b 04 24 0f 85 52 ff RSP: 0018:ffffc90000cf7048 EFLAGS: 00010206 RAX: 00000000000000b4 RBX: dffffc0000000000 RCX: 0000000000000000 RDX: ffff88813fe09d00 RSI: ffffffff87de6a70 RDI: 00000000000005a0 RBP: 0000000000000000 R08: 0000000000000000 R09: ffffffff8fd38aa7 R10: ffffffff87de6a04 R11: 0000000000000000 R12: 0000000000000002 R13: ffff88801cfc18a0 R14: ffffed10039f831e R15: 0000000000000530 FS: 0000000000000000(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffdd3a6eff8 CR3: 000000007dbcd000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600 Call Trace: __fib6_drop_pcpu_from net/ipv6/ip6_fib.c:960 [inline] fib6_drop_pcpu_from net/ipv6/ip6_fib.c:1021 [inline] fib6_purge_rt+0x6b9/0x820 net/ipv6/ip6_fib.c:1032 fib6_del_route net/ipv6/ip6_fib.c:1982 [inline] fib6_del+0xa28/0x15d0 net/ipv6/ip6_fib.c:2027 fib6_clean_node+0x393/0x5c0 net/ipv6/ip6_fib.c:2189 fib6_walk_continue+0x400/0x720 net/ipv6/ip6_fib.c:2111 fib6_walk+0x182/0x370 net/ipv6/ip6_fib.c:2159 fib6_clean_tree+0xdb/0x120 net/ipv6/ip6_fib.c:2239 __fib6_clean_all+0x107/0x2a0 net/ipv6/ip6_fib.c:2255 rt6_sync_down_dev net/ipv6/route.c:4888 [inline] rt6_disable_ip+0x844/0x940 net/ipv6/route.c:4893 addrconf_ifdown.isra.0+0xf6/0x1630 net/ipv6/addrconf.c:3726 addrconf_notify+0xeb/0x1bb0 net/ipv6/addrconf.c:3651 notifier_call_chain+0xb5/0x200 kernel/notifier.c:83 call_netdevice_notifiers_info+0xb5/0x130 net/core/dev.c:2002 call_netdevice_notifiers_extack net/core/dev.c:2014 [inline] call_netdevice_notifiers net/core/dev.c:2028 [inline] dev_close_many+0x2ff/0x620 net/core/dev.c:1603 dev_close net/core/dev.c:1625 [inline] dev_close+0x16d/0x210 net/core/dev.c:1619 cfg80211_shutdown_all_interfaces+0x96/0x1f0 net/wireless/core.c:273 ieee80211_remove_interfaces+0xed/0x820 net/mac80211/iface.c:2149 ieee80211_unregister_hw+0x47/0x1f0 net/mac80211/main.c:1391 mac80211_hwsim_del_radio drivers/net/wireless/mac80211_hwsim.c:3583 [inline] hwsim_exit_net+0x50e/0xca0 drivers/net/wireless/mac80211_hwsim.c:4346 ops_exit_list+0xb0/0x160 net/core/net_namespace.c:168 cleanup_net+0x4ea/0xb00 net/core/net_namespace.c:593 process_one_work+0x9b2/0x1690 kernel/workqueue.c:2297 worker_thread+0x658/0x11f0 kernel/workqueue.c:2444 kthread+0x405/0x4f0 kernel/kthread.c:327 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 Modules linked in: ---[ end trace 61b8736de5c20fc7 ]--- RIP: 0010:__fib6_drop_pcpu_from.part.0+0x10b/0x390 net/ipv6/ip6_fib.c:978 Code: 48 c1 ea 03 80 3c 1a 00 0f 85 19 02 00 00 4c 8b 38 4d 85 ff 0f 84 7a ff ff ff e8 20 08 99 f9 49 8d 7f 70 48 89 f8 48 c1 e8 03 <80> 3c 18 00 0f 85 4b 02 00 00 49 8b 47 70 48 3b 04 24 0f 85 52 ff RSP: 0018:ffffc90000cf7048 EFLAGS: 00010206 RAX: 00000000000000b4 RBX: dffffc0000000000 RCX: 0000000000000000 RDX: ffff88813fe09d00 RSI: ffffffff87de6a70 RDI: 00000000000005a0 RBP: 0000000000000000 R08: 0000000000000000 R09: ffffffff8fd38aa7 R10: ffffffff87de6a04 R11: 0000000000000000 R12: 0000000000000002 R13: ffff88801cfc18a0 R14: ffffed10039f831e R15: 0000000000000530 FS: 0000000000000000(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffdd3a6eff8 CR3: 000000000b68e000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600 ---------------- Code disassembly (best guess): 0: 48 c1 ea 03 shr $0x3,%rdx 4: 80 3c 1a 00 cmpb $0x0,(%rdx,%rbx,1) 8: 0f 85 19 02 00 00 jne 0x227 e: 4c 8b 38 mov (%rax),%r15 11: 4d 85 ff test %r15,%r15 14: 0f 84 7a ff ff ff je 0xffffff94 1a: e8 20 08 99 f9 callq 0xf999083f 1f: 49 8d 7f 70 lea 0x70(%r15),%rdi 23: 48 89 f8 mov %rdi,%rax 26: 48 c1 e8 03 shr $0x3,%rax * 2a: 80 3c 18 00 cmpb $0x0,(%rax,%rbx,1) <-- trapping instruction 2e: 0f 85 4b 02 00 00 jne 0x27f 34: 49 8b 47 70 mov 0x70(%r15),%rax 38: 48 3b 04 24 cmp (%rsp),%rax 3c: 0f .byte 0xf 3d: 85 52 ff test %edx,-0x1(%rdx)