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Tue, 08 Apr 2025 09:05:20 -0700 (PDT) Received: from localhost ([2601:646:9e00:f56e:123b:cea3:439a:b3e3]) by smtp.gmail.com with UTF8SMTPSA id d2e1a72fcca58-739d97f3719sm10749912b3a.71.2025.04.08.09.05.19 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 08 Apr 2025 09:05:20 -0700 (PDT) Date: Tue, 8 Apr 2025 09:05:19 -0700 From: Stanislav Fomichev To: syzbot Cc: davem@davemloft.net, dsahern@kernel.org, edumazet@google.com, horms@kernel.org, kuba@kernel.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, pabeni@redhat.com, syzkaller-bugs@googlegroups.com Subject: Re: [syzbot] [net?] WARNING in ipv6_add_dev Message-ID: References: <67f5351f.050a0220.12542b.0001.GAE@google.com> Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: <67f5351f.050a0220.12542b.0001.GAE@google.com> On 04/08, syzbot wrote: > Hello, > > syzbot found the following issue on: > > HEAD commit: 0af2f6be1b42 Linux 6.15-rc1 > git tree: upstream > console output: https://syzkaller.appspot.com/x/log.txt?x=166dffb0580000 > kernel config: https://syzkaller.appspot.com/x/.config?x=66996a2350ef05e0 > dashboard link: https://syzkaller.appspot.com/bug?extid=3ab016dc5f28b32452c1 > compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 > userspace arch: i386 > > Unfortunately, I don't have any reproducer for this issue yet. > > Downloadable assets: > disk image: https://storage.googleapis.com/syzbot-assets/2bd38b4e51ec/disk-0af2f6be.raw.xz > vmlinux: https://storage.googleapis.com/syzbot-assets/928b4d433463/vmlinux-0af2f6be.xz > kernel image: https://storage.googleapis.com/syzbot-assets/9c0fa5febc31/bzImage-0af2f6be.xz > > IMPORTANT: if you fix the issue, please add the following tag to the commit: > Reported-by: syzbot+3ab016dc5f28b32452c1@syzkaller.appspotmail.com > > ------------[ cut here ]------------ > WARNING: CPU: 1 PID: 813 at ./include/net/netdev_lock.h:54 netdev_ops_assert_locked include/net/netdev_lock.h:54 [inline] > WARNING: CPU: 1 PID: 813 at ./include/net/netdev_lock.h:54 ipv6_add_dev+0x104c/0x1430 net/ipv6/addrconf.c:381 > Modules linked in: > CPU: 1 UID: 0 PID: 813 Comm: kworker/u8:1 Not tainted 6.15.0-rc1-syzkaller #0 PREEMPT(full) > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 > Workqueue: events_unbound linkwatch_event > RIP: 0010:netdev_ops_assert_locked include/net/netdev_lock.h:54 [inline] > RIP: 0010:ipv6_add_dev+0x104c/0x1430 net/ipv6/addrconf.c:381 > Code: ff ff e8 67 5d fe f6 48 bd 00 00 00 00 00 fc ff df 48 8b 3c 24 4c 8b 6c 24 18 4c 8b 64 24 28 e9 7f fc ff ff e8 45 5d fe f6 90 <0f> 0b 90 e9 64 f1 ff ff e8 37 5d fe f6 c6 05 16 e3 84 05 01 90 48 > RSP: 0018:ffffc9001cbbf3d8 EFLAGS: 00010293 > RAX: ffffffff8ac4f7db RBX: 0000000000000000 RCX: ffff88807a275a00 > RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 > RBP: 0000000000000000 R08: ffffffff8ac4e8fb R09: 1ffffffff201fa64 > R10: dffffc0000000000 R11: fffffbfff201fa65 R12: ffff88805d942000 > R13: ffff88805d942000 R14: dffffc0000000000 R15: ffff88805d942000 > FS: 0000000000000000(0000) GS:ffff888125096000(0000) knlGS:0000000000000000 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: 00000000f5045ffc CR3: 0000000032240000 CR4: 00000000003526f0 > DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 > DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 > Call Trace: > > ipv6_find_idev+0xc2/0x1e0 net/ipv6/addrconf.c:496 > addrconf_add_dev+0xbe/0x530 net/ipv6/addrconf.c:2560 > addrconf_dev_config net/ipv6/addrconf.c:3479 [inline] > addrconf_init_auto_addrs+0x8f1/0xfe0 net/ipv6/addrconf.c:3567 > addrconf_notify+0xaff/0x1020 net/ipv6/addrconf.c:3740 > notifier_call_chain+0x1a5/0x3f0 kernel/notifier.c:85 > netdev_state_change+0x123/0x1a0 net/core/dev.c:1536 Still has netdev_state_change #syz fix: "net: hold instance lock during NETDEV_CHANGE"