[syzbot] BUG: Address fc00:: on device lo is missing its host route.

[syzbot] BUG: Address fc00:: on device lo is missing its host route.

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit:    364465ab19de Merge tag 'v7.2-rc6-smb3-server-fixes' of git..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=108402c6580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=acc0a882b963ae23
dashboard link: https://syzkaller.appspot.com/bug?extid=ded267b328e950a7c0c4
compiler:       gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for Debian) 2.44

Unfortunately, I don't have any reproducer for this issue yet.

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/a16108cc17bc/disk-364465ab.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/06f139add938/vmlinux-364465ab.xz
kernel image: https://storage.googleapis.com/syzbot-assets/7d4060230883/bzImage-364465ab.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+ded267b328e950a7c0c4@syzkaller.appspotmail.com

IPv6: BUG: Address fc00:: on device lo is missing its host route.
bond9: (slave ip6gretap1): link status up, enabling it in 0 ms
bond9: (slave ip6gretap1): failed to get link speed/duplex
bond9: (slave ip6gretap1): link status up, enabling it in 0 ms
bond9: (slave ip6gretap1): failed to get link speed/duplex
bond9: (slave ip6gretap1): link status up, enabling it in 0 ms
bond9: (slave ip6gretap1): failed to get link speed/duplex
net_ratelimit: 80 callbacks suppressed
bond9: (slave ip6gretap1): link status up, enabling it in 0 ms
bond9: (slave ip6gretap1): failed to get link speed/duplex
bond9: (slave ip6gretap1): link status up, enabling it in 0 ms
bond9: (slave ip6gretap1): failed to get link speed/duplex


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Re: [syzbot] BUG: Address fc00:: on device lo is missing its host route.

[syzbot]

syzbot has found a reproducer for the following issue on:

HEAD commit:    9d2ed026f031 Merge tag 'sysctl-7.03-rc1' of git://git.kern..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=10661e79580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=996f19b48f3c7123
dashboard link: https://syzkaller.appspot.com/bug?extid=ded267b328e950a7c0c4
compiler:       gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for Debian) 2.44
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=10d20415580000

Downloadable assets:
disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/d900f083ada3/non_bootable_disk-9d2ed026.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/dbab070bbde5/vmlinux-9d2ed026.xz
kernel image: https://storage.googleapis.com/syzbot-assets/857014a70033/bzImage-9d2ed026.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+ded267b328e950a7c0c4@syzkaller.appspotmail.com

netdevsim netdevsim0 netdevsim1: set [1, 0] type 2 family 0 port 6081 - 0
IPv6: BUG: Address fc00:: on device lo is missing its host route.
netdevsim netdevsim0 netdevsim3 (unregistering): unset [1, 0] type 2 family 0 port 6081 - 0
netdevsim netdevsim0 netdevsim2 (unregistering): unset [1, 0] type 2 family 0 port 6081 - 0
netdevsim netdevsim0 netdevsim1 (unregistering): unset [1, 0] type 2 family 0 port 6081 - 0
netdevsim netdevsim0 netdevsim0 (unregistering): unset [1, 0] type 2 family 0 port 6081 - 0
bridge_slave_1: left allmulticast mode
bridge_slave_1: left promiscuous mode
bridge0: port 2(bridge_slave_1) entered disabled state
bridge_slave_0: left allmulticast mode
bridge_slave_0: left promiscuous mode
bridge0: port 1(bridge_slave_0) entered disabled state
bond0 (unregistering): (slave bond_slave_0): Releasing backup interface
bond0 (unregistering): (slave bond_slave_1): Releasing backup interface
bond0 (unregistering): Released all slaves
hsr_slave_0: left promiscuous mode
hsr_slave_1: left promiscuous mode
batman_adv: batadv0: Interface deactivated: batadv_slave_0
batman_adv: batadv0: Removing interface: batadv_slave_0
batman_adv: batadv0: Interface deactivated: batadv_slave_1
batman_adv: batadv0: Removing interface: batadv_slave_1
veth1_macvtap: left promiscuous mode
veth0_macvtap: left promiscuous mode
veth1_vlan: left promiscuous mode
veth0_vlan: left promiscuous mode
team0 (unregistering): Port device team_slave_1 removed
team0 (unregistering): Port device team_slave_0 removed


---
If you want syzbot to run the reproducer, reply with:
#syz test: git://repo/address.git branch-or-commit-hash
If you attach or paste a git patch, syzbot will apply it before testing.

Re: [syzbot] BUG: Address fc00:: on device lo is missing its host route.

[syzbot]

syzbot has found a reproducer for the following issue on:

HEAD commit:    21d6ac051080 Merge branch 'for-next/core' into for-kernelci
git tree:       git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci
console output: https://syzkaller.appspot.com/x/log.txt?x=11bd5e79580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=d1128bc53f2ef7f3
dashboard link: https://syzkaller.appspot.com/bug?extid=ded267b328e950a7c0c4
compiler:       Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8
userspace arch: arm64
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=10d52179580000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=11c94415580000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/88380e2ddcb9/disk-21d6ac05.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/5dba5c2896b7/vmlinux-21d6ac05.xz
kernel image: https://storage.googleapis.com/syzbot-assets/52ac739e37e0/Image-21d6ac05.gz.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+ded267b328e950a7c0c4@syzkaller.appspotmail.com

wlan0: Creating new IBSS network, BSSID 50:50:50:50:50:50
wlan1: Created IBSS using preconfigured BSSID 50:50:50:50:50:50
wlan1: Creating new IBSS network, BSSID 50:50:50:50:50:50
IPv6: BUG: Address fc00:: on device lo is missing its host route.


---
If you want syzbot to run the reproducer, reply with:
#syz test: git://repo/address.git branch-or-commit-hash
If you attach or paste a git patch, syzbot will apply it before testing.