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Message-ID: <CANp29Y7YHm2A3AHuvmKzc0hQdZmZwyNouy6F6xnHBBE4YMa=Yw@mail.gmail.com> Date: Fri, 5 Jan 2024 19:46:07 +0100 From: Aleksandr Nogikh <nogikh@...gle.com> To: syzbot <syzbot+42cfec52b6508887bbe8@...kaller.appspotmail.com> Cc: alexander.mikhalitsyn@...tuozzo.com, davem@...emloft.net, den@...nvz.org, dsahern@...nel.org, edumazet@...gle.com, f.fainelli@...il.com, kuba@...nel.org, linux-kernel@...r.kernel.org, netdev@...r.kernel.org, pabeni@...hat.com, razor@...ckwall.org, syzkaller-bugs@...glegroups.com, thomas.zeitlhofer+lkml@...it.at, thomas.zeitlhofer@...it.at, wangyuweihx@...il.com Subject: Re: [syzbot] [net?] memory leak in ___neigh_create (2) I'm very sorry for the inconvenience due to the syzbot breakage! The reporting was stopped. We're figuring out what went wrong and will add more fine-grained controls to prevent such situations in the future. On Fri, Jan 5, 2024 at 7:41 PM syzbot <syzbot+42cfec52b6508887bbe8@...kaller.appspotmail.com> wrote: > > syzbot has found a reproducer for the following issue on: > > HEAD commit: 2258c2dc850b Merge tag 'for-linus' of git://git.kernel.org.. > git tree: upstream > console output: https://syzkaller.appspot.com/x/log.txt?x=16f67b44480000 > kernel config: https://syzkaller.appspot.com/x/.config?x=a4fb7ad9185f1501 > dashboard link: https://syzkaller.appspot.com/bug?extid=42cfec52b6508887bbe8 > compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2 > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=14e23d44480000 > > Downloadable assets: > disk image: https://storage.googleapis.com/syzbot-assets/0e65a45877eb/disk-2258c2dc.raw.xz > vmlinux: https://storage.googleapis.com/syzbot-assets/7617adf885a8/vmlinux-2258c2dc.xz > kernel image: https://storage.googleapis.com/syzbot-assets/43fb89ea894a/bzImage-2258c2dc.xz > > IMPORTANT: if you fix the issue, please add the following tag to the commit: > Reported-by: syzbot+42cfec52b6508887bbe8@...kaller.appspotmail.com > > BUG: memory leak > unreferenced object 0xffff88810b8ea400 (size 512): > comm "kworker/0:3", pid 4440, jiffies 4294938594 (age 1132.680s) > hex dump (first 32 bytes): > 00 9c f8 0a 81 88 ff ff 80 29 23 86 ff ff ff ff .........)#..... > c0 79 79 44 81 88 ff ff 72 78 ff ff 00 00 00 00 .yyD....rx...... > backtrace: > [<ffffffff814f9fe6>] __do_kmalloc_node mm/slab_common.c:967 [inline] > [<ffffffff814f9fe6>] __kmalloc+0x46/0x120 mm/slab_common.c:981 > [<ffffffff83b5234f>] kmalloc include/linux/slab.h:584 [inline] > [<ffffffff83b5234f>] kzalloc include/linux/slab.h:720 [inline] > [<ffffffff83b5234f>] neigh_alloc net/core/neighbour.c:476 [inline] > [<ffffffff83b5234f>] ___neigh_create+0xdf/0xd60 net/core/neighbour.c:661 > [<ffffffff83f9f886>] ip6_finish_output2+0x776/0x9b0 net/ipv6/ip6_output.c:125 > [<ffffffff83fa5530>] __ip6_finish_output net/ipv6/ip6_output.c:195 [inline] > [<ffffffff83fa5530>] ip6_finish_output+0x270/0x530 net/ipv6/ip6_output.c:206 > [<ffffffff83fa5893>] NF_HOOK_COND include/linux/netfilter.h:291 [inline] > [<ffffffff83fa5893>] ip6_output+0xa3/0x1b0 net/ipv6/ip6_output.c:227 > [<ffffffff83ff16d9>] dst_output include/net/dst.h:444 [inline] > [<ffffffff83ff16d9>] NF_HOOK include/linux/netfilter.h:302 [inline] > [<ffffffff83ff16d9>] NF_HOOK.constprop.0+0x49/0x110 include/linux/netfilter.h:296 > [<ffffffff83ff19c4>] mld_sendpack+0x224/0x350 net/ipv6/mcast.c:1820 > [<ffffffff83ff5403>] mld_send_cr net/ipv6/mcast.c:2121 [inline] > [<ffffffff83ff5403>] mld_ifc_work+0x2a3/0x750 net/ipv6/mcast.c:2653 > [<ffffffff8129519a>] process_one_work+0x2ba/0x5f0 kernel/workqueue.c:2289 > [<ffffffff81295ab9>] worker_thread+0x59/0x5b0 kernel/workqueue.c:2436 > [<ffffffff8129fb05>] kthread+0x125/0x160 kernel/kthread.c:376 > [<ffffffff8100224f>] ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308 > > BUG: memory leak > unreferenced object 0xffff888109a7fa00 (size 512): > comm "kworker/0:3", pid 4440, jiffies 4294938594 (age 1132.680s) > hex dump (first 32 bytes): > 00 00 00 00 00 00 00 00 80 29 23 86 ff ff ff ff .........)#..... > 00 79 79 44 81 88 ff ff 72 78 ff ff 00 00 00 00 .yyD....rx...... > backtrace: > [<ffffffff814f9fe6>] __do_kmalloc_node mm/slab_common.c:967 [inline] > [<ffffffff814f9fe6>] __kmalloc+0x46/0x120 mm/slab_common.c:981 > [<ffffffff83b5234f>] kmalloc include/linux/slab.h:584 [inline] > [<ffffffff83b5234f>] kzalloc include/linux/slab.h:720 [inline] > [<ffffffff83b5234f>] neigh_alloc net/core/neighbour.c:476 [inline] > [<ffffffff83b5234f>] ___neigh_create+0xdf/0xd60 net/core/neighbour.c:661 > [<ffffffff83f9f886>] ip6_finish_output2+0x776/0x9b0 net/ipv6/ip6_output.c:125 > [<ffffffff83fa5530>] __ip6_finish_output net/ipv6/ip6_output.c:195 [inline] > [<ffffffff83fa5530>] ip6_finish_output+0x270/0x530 net/ipv6/ip6_output.c:206 > [<ffffffff83fa5893>] NF_HOOK_COND include/linux/netfilter.h:291 [inline] > [<ffffffff83fa5893>] ip6_output+0xa3/0x1b0 net/ipv6/ip6_output.c:227 > [<ffffffff83ff16d9>] dst_output include/net/dst.h:444 [inline] > [<ffffffff83ff16d9>] NF_HOOK include/linux/netfilter.h:302 [inline] > [<ffffffff83ff16d9>] NF_HOOK.constprop.0+0x49/0x110 include/linux/netfilter.h:296 > [<ffffffff83ff19c4>] mld_sendpack+0x224/0x350 net/ipv6/mcast.c:1820 > [<ffffffff83ff5403>] mld_send_cr net/ipv6/mcast.c:2121 [inline] > [<ffffffff83ff5403>] mld_ifc_work+0x2a3/0x750 net/ipv6/mcast.c:2653 > [<ffffffff8129519a>] process_one_work+0x2ba/0x5f0 kernel/workqueue.c:2289 > [<ffffffff81295ab9>] worker_thread+0x59/0x5b0 kernel/workqueue.c:2436 > [<ffffffff8129fb05>] kthread+0x125/0x160 kernel/kthread.c:376 > [<ffffffff8100224f>] ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308 > > BUG: memory leak > unreferenced object 0xffff88810a9fb400 (size 512): > comm "dhcpcd", pid 4638, jiffies 4294938595 (age 1132.670s) > hex dump (first 32 bytes): > 00 00 00 00 00 00 00 00 80 29 23 86 ff ff ff ff .........)#..... > c0 76 79 44 81 88 ff ff 73 78 ff ff 00 00 00 00 .vyD....sx...... > backtrace: > [<ffffffff814f9fe6>] __do_kmalloc_node mm/slab_common.c:967 [inline] > [<ffffffff814f9fe6>] __kmalloc+0x46/0x120 mm/slab_common.c:981 > [<ffffffff83b5234f>] kmalloc include/linux/slab.h:584 [inline] > [<ffffffff83b5234f>] kzalloc include/linux/slab.h:720 [inline] > [<ffffffff83b5234f>] neigh_alloc net/core/neighbour.c:476 [inline] > [<ffffffff83b5234f>] ___neigh_create+0xdf/0xd60 net/core/neighbour.c:661 > [<ffffffff83f9f886>] ip6_finish_output2+0x776/0x9b0 net/ipv6/ip6_output.c:125 > [<ffffffff83fa5530>] __ip6_finish_output net/ipv6/ip6_output.c:195 [inline] > [<ffffffff83fa5530>] ip6_finish_output+0x270/0x530 net/ipv6/ip6_output.c:206 > [<ffffffff83fa5893>] NF_HOOK_COND include/linux/netfilter.h:291 [inline] > [<ffffffff83fa5893>] ip6_output+0xa3/0x1b0 net/ipv6/ip6_output.c:227 > [<ffffffff84062411>] dst_output include/net/dst.h:444 [inline] > [<ffffffff84062411>] ip6_local_out+0x51/0x70 net/ipv6/output_core.c:155 > [<ffffffff83fa6285>] ip6_send_skb+0x25/0xc0 net/ipv6/ip6_output.c:1971 > [<ffffffff83fa6394>] ip6_push_pending_frames+0x74/0x90 net/ipv6/ip6_output.c:1991 > [<ffffffff83fec08c>] rawv6_push_pending_frames net/ipv6/raw.c:579 [inline] > [<ffffffff83fec08c>] rawv6_sendmsg+0x16ac/0x1ba0 net/ipv6/raw.c:922 > [<ffffffff83ebe965>] inet_sendmsg+0x45/0x70 net/ipv4/af_inet.c:827 > [<ffffffff83af7116>] sock_sendmsg_nosec net/socket.c:714 [inline] > [<ffffffff83af7116>] sock_sendmsg+0x56/0x80 net/socket.c:734 > [<ffffffff83af769d>] ____sys_sendmsg+0x38d/0x410 net/socket.c:2476 > [<ffffffff83afbfe8>] ___sys_sendmsg+0xa8/0x110 net/socket.c:2530 > [<ffffffff83afc178>] __sys_sendmsg+0x88/0x100 net/socket.c:2559 > [<ffffffff848ed5b5>] do_syscall_x64 arch/x86/entry/common.c:50 [inline] > [<ffffffff848ed5b5>] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 > [<ffffffff84a00087>] entry_SYSCALL_64_after_hwframe+0x63/0xcd > > BUG: memory leak > unreferenced object 0xffff88810a9fba00 (size 512): > comm "dhcpcd", pid 4638, jiffies 4294938595 (age 1132.670s) > hex dump (first 32 bytes): > 00 00 00 00 00 00 00 00 80 29 23 86 ff ff ff ff .........)#..... > 80 77 79 44 81 88 ff ff 73 78 ff ff 00 00 00 00 .wyD....sx...... > backtrace: > [<ffffffff814f9fe6>] __do_kmalloc_node mm/slab_common.c:967 [inline] > [<ffffffff814f9fe6>] __kmalloc+0x46/0x120 mm/slab_common.c:981 > [<ffffffff83b5234f>] kmalloc include/linux/slab.h:584 [inline] > [<ffffffff83b5234f>] kzalloc include/linux/slab.h:720 [inline] > [<ffffffff83b5234f>] neigh_alloc net/core/neighbour.c:476 [inline] > [<ffffffff83b5234f>] ___neigh_create+0xdf/0xd60 net/core/neighbour.c:661 > [<ffffffff83f9f886>] ip6_finish_output2+0x776/0x9b0 net/ipv6/ip6_output.c:125 > [<ffffffff83fa5530>] __ip6_finish_output net/ipv6/ip6_output.c:195 [inline] > [<ffffffff83fa5530>] ip6_finish_output+0x270/0x530 net/ipv6/ip6_output.c:206 > [<ffffffff83fa5893>] NF_HOOK_COND include/linux/netfilter.h:291 [inline] > [<ffffffff83fa5893>] ip6_output+0xa3/0x1b0 net/ipv6/ip6_output.c:227 > [<ffffffff84062411>] dst_output include/net/dst.h:444 [inline] > [<ffffffff84062411>] ip6_local_out+0x51/0x70 net/ipv6/output_core.c:155 > [<ffffffff83fa6285>] ip6_send_skb+0x25/0xc0 net/ipv6/ip6_output.c:1971 > [<ffffffff83fa6394>] ip6_push_pending_frames+0x74/0x90 net/ipv6/ip6_output.c:1991 > [<ffffffff83fec08c>] rawv6_push_pending_frames net/ipv6/raw.c:579 [inline] > [<ffffffff83fec08c>] rawv6_sendmsg+0x16ac/0x1ba0 net/ipv6/raw.c:922 > [<ffffffff83ebe965>] inet_sendmsg+0x45/0x70 net/ipv4/af_inet.c:827 > [<ffffffff83af7116>] sock_sendmsg_nosec net/socket.c:714 [inline] > [<ffffffff83af7116>] sock_sendmsg+0x56/0x80 net/socket.c:734 > [<ffffffff83af769d>] ____sys_sendmsg+0x38d/0x410 net/socket.c:2476 > [<ffffffff83afbfe8>] ___sys_sendmsg+0xa8/0x110 net/socket.c:2530 > [<ffffffff83afc178>] __sys_sendmsg+0x88/0x100 net/socket.c:2559 > [<ffffffff848ed5b5>] do_syscall_x64 arch/x86/entry/common.c:50 [inline] > [<ffffffff848ed5b5>] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 > [<ffffffff84a00087>] entry_SYSCALL_64_after_hwframe+0x63/0xcd > > > > --- > 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. > > -- > You received this message because you are subscribed to the Google Groups "syzkaller-bugs" group. > To unsubscribe from this group and stop receiving emails from it, send an email to syzkaller-bugs+unsubscribe@...glegroups.com. > To view this discussion on the web visit https://groups.google.com/d/msgid/syzkaller-bugs/000000000000d4a93c060e373195%40google.com.
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