Re: [syzbot] [rdma?] INFO: trying to register non-static key in skb_dequeue (2)

[Zhu Yanjun]

On Tue, May 23, 2023 at 2:11 PM Guoqing Jiang <guoqing.jiang@xxxxxxxxx> wrote:
>
>
>
> On 5/23/23 14:07, Zhu Yanjun wrote:
>
> >> There was another null-ptr-deref, no?
> > Please show me the link. So I can delve into it.
>
> Just the first mail of the thread ...
>
> >> general protection fault, probably for non-canonical address 0xdffffc0000000006: 0000 [#1] PREEMPT SMP KASAN
> >> KASAN: null-ptr-deref in range [0x0000000000000030-0x0000000000000037]
> >> CPU: 1 PID: 31038 Comm: syz-executor.3 Not tainted 6.3.0-syzkaller-12728-g348551ddaf31 #0
> >> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/14/2023
> >> RIP: 0010:flush_send_queue drivers/infiniband/sw/rxe/rxe_comp.c:597 [inline]
> >> RIP: 0010:rxe_completer+0x255c/0x3cc0 drivers/infiniband/sw/rxe/rxe_comp.c:653
> >> Code: 80 3c 02 00 0f 85 81 10 00 00 49 8b af 88 03 00 00 48 8d 45 30 48 89 c2 48 89 04 24 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 <0f> b6 04 02 84 c0 74 08 3c 03 0f 8e 83 11 00 00 48 8d 45 2c 44 8b
> >> RSP: 0018:ffffc90003526938 EFLAGS: 00010206
> >> RAX: dffffc0000000000 RBX: ffffed100e3fe800 RCX: ffffc9000b403000
> >> RDX: 0000000000000006 RSI: ffffffff877e467a RDI: ffff888071ff4388
> >> RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
> >> R10: fffffbfff1cf3682 R11: fffffffffffda5b0 R12: ffff888071ff41a0
> >> R13: 0000000000000000 R14: 0000000000000000 R15: ffff888071ff4000
> >> FS:  00007fede029f700(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000
> >> CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> >> CR2: 0000001b2d822000 CR3: 000000002c7e6000 CR4: 00000000003506e0
> >> Call Trace:
> >>    <TASK>
> >>    rxe_qp_do_cleanup+0x1be/0x820 drivers/infiniband/sw/rxe/rxe_qp.c:761
> >>    execute_in_process_context+0x3b/0x150 kernel/workqueue.c:3473
> >>    __rxe_cleanup+0x21e/0x370 drivers/infiniband/sw/rxe/rxe_pool.c:233
> >>    rxe_create_qp+0x3f6/0x5f0 drivers/infiniband/sw/rxe/rxe_verbs.c:583
> >>    create_qp+0x5ac/0x970 drivers/infiniband/core/verbs.c:1235
> >>    ib_create_qp_kernel+0xa1/0x310 drivers/infiniband/core/verbs.c:1346
> >>    ib_create_qp include/rdma/ib_verbs.h:3743 [inline]
> >>    create_mad_qp+0x177/0x380 drivers/infiniband/core/mad.c:2905
> >>    ib_mad_port_open drivers/infiniband/core/mad.c:2986 [inline]
> >>    ib_mad_init_device+0xf40/0x1a90 drivers/infiniband/core/mad.c:3077
> >>    add_client_context+0x405/0x5e0 drivers/infiniband/core/device.c:721
> >>    enable_device_and_get+0x1cd/0x3b0 drivers/infiniband/core/device.c:1332
> >>    ib_register_device drivers/infiniband/core/device.c:1420 [inline]
> >>    ib_register_device+0x8b1/0xbc0 drivers/infiniband/core/device.c:1366
> >>    rxe_register_device+0x302/0x3e0 drivers/infiniband/sw/rxe/rxe_verbs.c:1485
> >>    rxe_net_add+0x90/0xf0 drivers/infiniband/sw/rxe/rxe_net.c:527
> >>    rxe_newlink+0xf0/0x1b0 drivers/infiniband/sw/rxe/rxe.c:197
> >>    nldev_newlink+0x332/0x5e0 drivers/infiniband/core/nldev.c:1731
> >>    rdma_nl_rcv_msg+0x371/0x6a0 drivers/infiniband/core/netlink.c:195
> >>    rdma_nl_rcv_skb.constprop.0.isra.0+0x2fc/0x440 drivers/infiniband/core/netlink.c:239
> >>    netlink_unicast_kernel net/netlink/af_netlink.c:1339 [inline]
> >>    netlink_unicast+0x547/0x7f0 net/netlink/af_netlink.c:1365
> >>    netlink_sendmsg+0x925/0xe30 net/netlink/af_netlink.c:1913
> >>    sock_sendmsg_nosec net/socket.c:724 [inline]
> >>    sock_sendmsg+0xde/0x190 net/socket.c:747
> >>    ____sys_sendmsg+0x71c/0x900 net/socket.c:2503
> >>    ___sys_sendmsg+0x110/0x1b0 net/socket.c:2557
> >>    __sys_sendmsg+0xf7/0x1c0 net/socket.c:2586
> >>    do_syscall_x64 arch/x86/entry/common.c:50 [inline]
> >>    do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80
> >>    entry_SYSCALL_64_after_hwframe+0x63/0xcd
> >> RIP: 0033:0x7feddf48c169
> >> Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 19 00 00 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 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48
> >> RSP: 002b:00007fede029f168 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
> >> RAX: ffffffffffffffda RBX: 00007feddf5abf80 RCX: 00007feddf48c169
> >> RDX: 0000000000000000 RSI: 0000000020000240 RDI: 0000000000000003
> >> RBP: 00007feddf4e7ca1 R08: 0000000000000000 R09: 0000000000000000
> >> R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
> >> R13: 00007ffe1bb3e01f R14: 00007fede029f300 R15: 0000000000022000
> >>    </TASK>
> >> Modules linked in:
> >>
>
> Anyway, pls check above in the link.
>
> https://lore.kernel.org/linux-rdma/3cc9f12a-d680-e05c-72c6-d4cb559fe5ee@xxxxxxxxx/T/#m2d374949d62b017074545c2f2a1df9251e0bde32
>

Based on the following analysis, the problem in the link is the same
with this problem.

infiniband syz2: set active
infiniband syz2: added bond_slave_1
INFO: trying to register non-static key.
The code is fine but needs lockdep annotation, or maybe
you didn't initialize this object before use?
         <----This means that this is a use-before-initialization
problem
turning off the locking correctness validator.
CPU: 1 PID: 31038 Comm: syz-executor.3 Not tainted
6.3.0-syzkaller-12728-g348551ddaf31 #0
Hardware name: Google Google Compute Engine/Google Compute Engine,
BIOS Google 04/14/2023
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0xd9/0x150 lib/dump_stack.c:106
 assign_lock_key kernel/locking/lockdep.c:982 [inline]
 register_lock_class+0xdb6/0x1120 kernel/locking/lockdep.c:1295
 __lock_acquire+0x10a/0x5df0 kernel/locking/lockdep.c:4951
 lock_acquire kernel/locking/lockdep.c:5691 [inline]
 lock_acquire+0x1b1/0x520 kernel/locking/lockdep.c:5656
 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
 _raw_spin_lock_irqsave+0x3d/0x60 kernel/locking/spinlock.c:162
 skb_dequeue+0x20/0x180 net/core/skbuff.c:3631
 drain_resp_pkts drivers/infiniband/sw/rxe/rxe_comp.c:555 [inline]
                    <----- when skb_dequeue is called, spin lock of
resp_pkts is not initialized.
 rxe_completer+0x250d/0x3cc0 drivers/infiniband/sw/rxe/rxe_comp.c:652
 rxe_qp_do_cleanup+0x1be/0x820 drivers/infiniband/sw/rxe/rxe_qp.c:761
 execute_in_process_context+0x3b/0x150 kernel/workqueue.c:3473
 __rxe_cleanup+0x21e/0x370 drivers/infiniband/sw/rxe/rxe_pool.c:233

 rxe_create_qp+0x3f6/0x5f0 drivers/infiniband/sw/rxe/rxe_verbs.c:583 <---- Here.

 "
 573         err = rxe_qp_from_init(rxe, qp, pd, init, uresp, ibqp->pd, udata);
 574         if (err) {
 575                 rxe_dbg_qp(qp, "create qp failed, err = %d", err);
 576                 goto err_cleanup;
 577         }
 578
 579         rxe_finalize(qp);
 580         return 0;
 581
 582 err_cleanup:
 583         cleanup_err = rxe_cleanup(qp);    <--- this is error handler.

 "
  create_qp+0x5ac/0x970 drivers/infiniband/core/verbs.c:1235
  ib_create_qp_kernel+0xa1/0x310 drivers/infiniband/core/verbs.c:1346

Zhu Yanjun
> Guoqing