kasan: CONFIG_KASAN_INLINE enabled kasan: GPF could be caused by NULL-ptr deref or user memory access general protection fault: 0000 [#1] PREEMPT SMP KASAN CPU: 1 PID: 9199 Comm: syz-executor0 Not tainted 4.20.0+ #3 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:fib6_drop_pcpu_from net/ipv6/ip6_fib.c:920 [inline] RIP: 0010:fib6_purge_rt+0x5c9/0x7f0 net/ipv6/ip6_fib.c:956 Code: 0f b6 3d d9 fa 82 03 31 ff 44 89 fe e8 a0 44 ad fa 45 84 ff 0f 84 e3 00 00 00 e8 52 43 ad fa 49 8d 7e 70 48 89 f8 48 c1 e8 03 <80> 3c 18 00 0f 85 b8 01 00 00 48 8d 45 98 4d 8b 7e 70 48 89 c2 48 RSP: 0018:ffff888062336b08 EFLAGS: 00010202 RAX: 0000000000000302 RBX: dffffc0000000000 RCX: ffffc90005e01000 RDX: 0000000000040000 RSI: ffffffff86d462be RDI: 0000000000001810 RBP: ffff888062336c08 R08: ffff888062124500 R09: ffffed1013541a2e R10: ffffed1013541a2d R11: ffff88809aa0d16f R12: 0000000000000000 R13: ffff88809aa0d140 R14: 00000000000017a0 R15: 0000000000000001 FS: 00007f646a5a7700(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f9a443382c8 CR3: 000000008cfdf000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 kobject: 'loop5' (00000000b3dffeac): kobject_uevent_env DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: kobject: 'loop5' (00000000b3dffeac): fill_kobj_path: path = '/devices/virtual/block/loop5' fib6_del_route net/ipv6/ip6_fib.c:1809 [inline] fib6_del+0xbdb/0x12e0 net/ipv6/ip6_fib.c:1840 fib6_clean_node+0x453/0x660 net/ipv6/ip6_fib.c:2002 fib6_walk_continue+0x4b3/0x8e0 net/ipv6/ip6_fib.c:1924 fib6_walk+0x9d/0x100 net/ipv6/ip6_fib.c:1972 fib6_clean_tree+0x22a/0x340 net/ipv6/ip6_fib.c:2051 __fib6_clean_all+0x216/0x430 net/ipv6/ip6_fib.c:2067 fib6_clean_all+0x2b/0x40 net/ipv6/ip6_fib.c:2078 rt6_sync_down_dev+0x17e/0x1b0 net/ipv6/route.c:4039 rt6_disable_ip+0x80/0x730 net/ipv6/route.c:4044 addrconf_ifdown+0x13e/0x15e0 net/ipv6/addrconf.c:3669 addrconf_notify+0x629/0x25f0 net/ipv6/addrconf.c:3594 notifier_call_chain+0x179/0x380 kernel/notifier.c:93 __raw_notifier_call_chain kernel/notifier.c:394 [inline] raw_notifier_call_chain+0x2e/0x40 kernel/notifier.c:401 call_netdevice_notifiers_info+0x3f/0x90 net/core/dev.c:1739 call_netdevice_notifiers_extack net/core/dev.c:1751 [inline] call_netdevice_notifiers net/core/dev.c:1765 [inline] __dev_notify_flags+0x293/0x470 net/core/dev.c:7607 dev_change_flags+0x10d/0x170 net/core/dev.c:7643 dev_ifsioc+0x359/0xa50 net/core/dev_ioctl.c:237 dev_ioctl+0x1b8/0xc70 net/core/dev_ioctl.c:488 sock_do_ioctl+0x1d9/0x400 net/socket.c:973 sock_ioctl+0x32f/0x6c0 net/socket.c:1074 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:509 [inline] do_vfs_ioctl+0x107b/0x17d0 fs/ioctl.c:696 ksys_ioctl+0xab/0xd0 fs/ioctl.c:713 __do_sys_ioctl fs/ioctl.c:720 [inline] __se_sys_ioctl fs/ioctl.c:718 [inline] __x64_sys_ioctl+0x73/0xb0 fs/ioctl.c:718 do_syscall_64+0x1a3/0x800 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x457ec9 Code: 6d b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 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 0f 83 3b b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f646a5a6c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000457ec9 RDX: 0000000020000040 RSI: 0000000000008914 RDI: 0000000000000004 RBP: 000000000073bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f646a5a76d4 R13: 00000000004c351f R14: 00000000004d5f68 R15: 00000000ffffffff Modules linked in: ---[ end trace 48fc441b9372834c ]--- RIP: 0010:fib6_drop_pcpu_from net/ipv6/ip6_fib.c:920 [inline] RIP: 0010:fib6_purge_rt+0x5c9/0x7f0 net/ipv6/ip6_fib.c:956 Code: 0f b6 3d d9 fa 82 03 31 ff 44 89 fe e8 a0 44 ad fa 45 84 ff 0f 84 e3 00 00 00 e8 52 43 ad fa 49 8d 7e 70 48 89 f8 48 c1 e8 03 <80> 3c 18 00 0f 85 b8 01 00 00 48 8d 45 98 4d 8b 7e 70 48 89 c2 48 RSP: 0018:ffff888062336b08 EFLAGS: 00010202 RAX: 0000000000000302 RBX: dffffc0000000000 RCX: ffffc90005e01000 RDX: 0000000000040000 RSI: ffffffff86d462be RDI: 0000000000001810 RBP: ffff888062336c08 R08: ffff888062124500 R09: ffffed1013541a2e R10: ffffed1013541a2d R11: ffff88809aa0d16f R12: 0000000000000000 R13: ffff88809aa0d140 R14: 00000000000017a0 R15: 0000000000000001 FS: 00007f646a5a7700(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f9a443382c8 CR3: 000000008cfdf000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400