Messages in this thread | | | From | Dmitry Vyukov <> | Date | Tue, 8 Nov 2022 10:36:32 -0800 | Subject | Re: [syzbot] BUG: MAX_LOCKDEP_KEYS too low! (2) |
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On Tue, 8 Nov 2022 at 05:40, syzbot <syzbot+a70a6358abd2c3f9550f@syzkaller.appspotmail.com> wrote: > > syzbot has found a reproducer for the following issue on: > > HEAD commit: 3577a7611842 Merge branches 'for-next/acpi', 'for-next/kbu.. > 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=15ea3e61880000 > kernel config: https://syzkaller.appspot.com/x/.config?x=606e57fd25c5c6cc > dashboard link: https://syzkaller.appspot.com/bug?extid=a70a6358abd2c3f9550f > compiler: Debian clang version 13.0.1-++20220126092033+75e33f71c2da-1~exp1~20220126212112.63, GNU ld (GNU Binutils for Debian) 2.35.2 > userspace arch: arm64 > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=168c4c99880000 > C reproducer: https://syzkaller.appspot.com/x/repro.c?x=145d6376880000 > > Downloadable assets: > disk image: https://storage.googleapis.com/syzbot-assets/054b1f56af52/disk-3577a761.raw.xz > vmlinux: https://storage.googleapis.com/syzbot-assets/c616835b2a22/vmlinux-3577a761.xz > kernel image: https://storage.googleapis.com/syzbot-assets/9825c28b2090/Image-3577a761.gz.xz > > IMPORTANT: if you fix the issue, please add the following tag to the commit: > Reported-by: syzbot+a70a6358abd2c3f9550f@syzkaller.appspotmail.com
I see team device code uses lockdep_register_key()/lockdep_set_class() in some interesting ways:
https://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git/tree/drivers/net/team/team.c?id=3577a76118426e4409ecf4f75520925eff67d42c#n1657 https://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git/tree/drivers/net/team/team.c?id=3577a76118426e4409ecf4f75520925eff67d42c#n2008
I guess that's what causes lockdep capacity exhaustion. Does team use it incorrectly?
> netlink: 4 bytes leftover after parsing attributes in process `syz-executor357'. > device team6635 entered promiscuous mode > 8021q: adding VLAN 0 to HW filter on device team6635 > BUG: MAX_LOCKDEP_KEYS too low! > turning off the locking correctness validator. > CPU: 0 PID: 9692 Comm: syz-executor357 Not tainted 6.1.0-rc4-syzkaller-31844-g3577a7611842 #0 > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/30/2022 > Call trace: > dump_backtrace+0x1c4/0x1f0 arch/arm64/kernel/stacktrace.c:156 > show_stack+0x2c/0x54 arch/arm64/kernel/stacktrace.c:163 > __dump_stack lib/dump_stack.c:88 [inline] > dump_stack_lvl+0x104/0x16c lib/dump_stack.c:106 > dump_stack+0x1c/0x58 lib/dump_stack.c:113 > register_lock_class+0x2e4/0x2f8 kernel/locking/lockdep.c:1326 > __lock_acquire+0xa8/0x3084 kernel/locking/lockdep.c:4934 > lock_acquire+0x100/0x1f8 kernel/locking/lockdep.c:5668 > __mutex_lock_common+0xd4/0xca8 kernel/locking/mutex.c:603 > __mutex_lock kernel/locking/mutex.c:747 [inline] > mutex_lock_nested+0x38/0x44 kernel/locking/mutex.c:799 > team_vlan_rx_add_vid+0x38/0xd8 drivers/net/team/team.c:1904 > vlan_add_rx_filter_info net/8021q/vlan_core.c:211 [inline] > __vlan_vid_add net/8021q/vlan_core.c:306 [inline] > vlan_vid_add+0x328/0x38c net/8021q/vlan_core.c:336 > vlan_device_event+0x200/0xc4c net/8021q/vlan.c:385 > notifier_call_chain kernel/notifier.c:87 [inline] > raw_notifier_call_chain+0x7c/0x108 kernel/notifier.c:455 > __dev_notify_flags+0x170/0x2e8 > rtnl_newlink_create+0x460/0x6bc net/core/rtnetlink.c:3372 > __rtnl_newlink net/core/rtnetlink.c:3581 [inline] > rtnl_newlink+0x728/0xa04 net/core/rtnetlink.c:3594 > rtnetlink_rcv_msg+0x484/0x82c net/core/rtnetlink.c:6091 > netlink_rcv_skb+0xe8/0x1d4 net/netlink/af_netlink.c:2540 > rtnetlink_rcv+0x28/0x38 net/core/rtnetlink.c:6109 > netlink_unicast_kernel+0xfc/0x1dc net/netlink/af_netlink.c:1319 > netlink_unicast+0x164/0x248 net/netlink/af_netlink.c:1345 > netlink_sendmsg+0x484/0x584 net/netlink/af_netlink.c:1921 > sock_sendmsg_nosec net/socket.c:714 [inline] > sock_sendmsg net/socket.c:734 [inline] > ____sys_sendmsg+0x2f8/0x440 net/socket.c:2482 > ___sys_sendmsg net/socket.c:2536 [inline] > __sys_sendmsg+0x1ac/0x228 net/socket.c:2565 > __do_sys_sendmsg net/socket.c:2574 [inline] > __se_sys_sendmsg net/socket.c:2572 [inline] > __arm64_sys_sendmsg+0x2c/0x3c net/socket.c:2572 > __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] > invoke_syscall arch/arm64/kernel/syscall.c:52 [inline] > el0_svc_common+0x138/0x220 arch/arm64/kernel/syscall.c:142 > do_el0_svc+0x48/0x164 arch/arm64/kernel/syscall.c:206 > el0_svc+0x58/0x150 arch/arm64/kernel/entry-common.c:637 > el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 > el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:581 >
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