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Date:   Thu, 10 Mar 2022 06:12:54 +0000
Content-Type: multipart/mixed;
 boundary="--=_RainLoop_652_197531094.1646892774"
From:   "Yajun Deng" <yajun.deng@linux.dev>
Message-ID: <18cd9e734496d2ab93cbe77d446fd33d@linux.dev>
Subject: Re: [PATCH rdma-next] Revert "RDMA/core: Fix ib_qp_usecnt_dec()
 called when error"
To:     "Leon Romanovsky" <leon@kernel.org>
Cc:     "Leon Romanovsky" <leonro@nvidia.com>,
        linux-kernel@vger.kernel.org, linux-rdma@vger.kernel.org,
        "Jason Gunthorpe" <jgg@nvidia.com>
In-Reply-To: <74c11029adaf449b3b9228a77cc82f39e9e892c8.1646851220.git.leonro@nvidia.com>
References: <74c11029adaf449b3b9228a77cc82f39e9e892c8.1646851220.git.leonro@nvidia.com>
Precedence: bulk


----=_RainLoop_652_197531094.1646892774
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Hi, Leon.=0ACan you test the attached patch?  If revert it, ib_qp_usecnt_=
dec() would called before ib_qp_usecnt_inc() when =0Acreate_xrc_qp_user()=
 return error.=0A=0AThanks=EF=BC=81=0A -- Yajun=0A=0AMarch 10, 2022 2:42 =
AM, "Leon Romanovsky" <leon@kernel.org> wrote:=0A=0A> From: Leon Romanovs=
ky <leonro@nvidia.com>=0A> =0A> This reverts commit 7c4a539ec38f4ce400a0f=
3fcb5ff6c940fcd67bb. which=0A> causes to the following error in mlx4.=0A>=
 =0A> [ 679.401416] ------------[ cut here ]------------=0A> [ 679.403542=
] Destroy of kernel CQ shouldn't fail=0A> [ 679.403580] WARNING: CPU: 4 P=
ID: 18064 at include/rdma/ib_verbs.h:3936=0A> mlx4_ib_dealloc_xrcd+0x12e/=
0x1b0 [mlx4_ib]=0A> [ 679.406534] Modules linked in: bonding ib_ipoib ip_=
gre ipip tunnel4 geneve rdma_ucm nf_tables=0A> ib_umad mlx4_en mlx4_ib ib=
_uverbs mlx4_core ip6_gre gre ip6_tunnel tunnel6 iptable_raw openvswitch=
=0A> nsh rpcrdma ib_iser libiscsi scsi_transport_iscsi rdma_cm iw_cm ib_c=
m ib_core xt_conntrack=0A> xt_MASQUERADE nf_conntrack_netlink nfnetlink x=
t_addrtype iptable_nat nf_nat br_netfilter overlay=0A> fuse [last unloade=
d: mlx4_core]=0A> [ 679.413323] CPU: 4 PID: 18064 Comm: ibv_xsrq_pingpo N=
ot tainted 5.17.0-rc7_master_62c6ecb #1=0A> [ 679.415043] Hardware name: =
QEMU Standard PC (Q35 + ICH9, 2009), BIOS=0A> rel-1.13.0-0-gf21b5a4aeb02-=
prebuilt.qemu.org 04/01/2014=0A> [ 679.417285] RIP: 0010:mlx4_ib_dealloc_=
xrcd+0x12e/0x1b0 [mlx4_ib]=0A> [ 679.418455] Code: 1e 93 08 00 40 80 fd 0=
1 0f 87 fa f1 04 00 83 e5 01 0f 85 2b ff ff ff 48 c7 c7=0A> 20 4f b6 a0 c=
6 05 fd 92 08 00 01 e8 47 c9 82 e2 <0f> 0b e9 11 ff ff ff 0f b6 2d eb 92 =
08 00 40 80=0A> fd 01 0f 87 b1 f1=0A> [ 679.421993] RSP: 0018:ffff8881a49=
57750 EFLAGS: 00010286=0A> [ 679.423047] RAX: 0000000000000000 RBX: ffff8=
881ac4b6800 RCX: 0000000000000000=0A> [ 679.424420] RDX: 0000000000000027=
 RSI: 0000000000000004 RDI: ffffed103492aedc=0A> [ 679.425818] RBP: 00000=
00000000000 R08: 0000000000000001 R09: ffff8884d2e378eb=0A> [ 679.427186]=
 R10: ffffed109a5c6f1d R11: 0000000000000001 R12: ffff888132620000=0A> [ =
679.428553] R13: ffff8881a4957a90 R14: ffff8881aa2d4000 R15: ffff8881a495=
7ad0=0A> [ 679.429939] FS: 00007f0401747740(0000) GS:ffff8884d2e00000(000=
0) knlGS:0000000000000000=0A> [ 679.431548] CS: 0010 DS: 0000 ES: 0000 CR=
0: 0000000080050033=0A> [ 679.432695] CR2: 000055f8ae036118 CR3: 00000001=
2fe94005 CR4: 0000000000370ea0=0A> [ 679.434099] DR0: 0000000000000000 DR=
1: 0000000000000000 DR2: 0000000000000000=0A> [ 679.435498] DR3: 00000000=
00000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400=0A> [ 679.436914] Ca=
ll Trace:=0A> [ 679.437510] <TASK>=0A> [ 679.438042] ib_dealloc_xrcd_user=
+0xce/0x120 [ib_core]=0A> [ 679.439245] ib_uverbs_dealloc_xrcd+0xad/0x210=
 [ib_uverbs]=0A> [ 679.440385] uverbs_free_xrcd+0xe8/0x190 [ib_uverbs]=0A=
> [ 679.441453] destroy_hw_idr_uobject+0x7a/0x130 [ib_uverbs]=0A> [ 679.4=
42568] uverbs_destroy_uobject+0x164/0x730 [ib_uverbs]=0A> [ 679.443699] u=
obj_destroy+0x72/0xf0 [ib_uverbs]=0A> [ 679.444653] ib_uverbs_cmd_verbs+0=
x19fb/0x3110 [ib_uverbs]=0A> [ 679.445805] ? entry_SYSCALL_64_after_hwfra=
me+0x44/0xae=0A> [ 679.446893] ? uverbs_finalize_object+0x50/0x50 [ib_uve=
rbs]=0A> [ 679.448037] ? check_chain_key+0x24a/0x580=0A> [ 679.448919] ? =
uverbs_fill_udata+0x540/0x540 [ib_uverbs]=0A> [ 679.450040] ? check_chain=
_key+0x24a/0x580=0A> [ 679.450934] ? remove_vma+0xca/0x100=0A> [ 679.4517=
36] ? lock_acquire+0x1b1/0x4c0=0A> [ 679.452553] ? lock_acquire+0x1b1/0x4=
c0=0A> [ 679.453393] ? ib_uverbs_ioctl+0x11e/0x260 [ib_uverbs]=0A> [ 679.=
454438] ? __might_fault+0xb8/0x160=0A> [ 679.455267] ? lockdep_hardirqs_o=
n_prepare+0x400/0x400=0A> [ 679.456329] ib_uverbs_ioctl+0x169/0x260 [ib_u=
verbs]=0A> [ 679.457384] ? ib_uverbs_ioctl+0x11e/0x260 [ib_uverbs]=0A> [ =
679.458443] ? ib_uverbs_cmd_verbs+0x3110/0x3110 [ib_uverbs]=0A> [ 679.459=
598] ? asm_sysvec_apic_timer_interrupt+0x12/0x20=0A> [ 679.460689] ? mark=
_held_locks+0x9f/0xe0=0A> [ 679.461577] __x64_sys_ioctl+0x856/0x1550=0A> =
[ 679.462439] ? vfs_fileattr_set+0x9f0/0x9f0=0A> [ 679.463328] ? __up_rea=
d+0x1a3/0x750=0A> [ 679.464102] ? up_write+0x4a0/0x4a0=0A> [ 679.464865] =
? __vm_munmap+0x22e/0x2e0=0A> [ 679.465690] ? __x64_sys_brk+0x840/0x840=
=0A> [ 679.466519] ? __cond_resched+0x17/0x80=0A> [ 679.467340] ? lockdep=
_hardirqs_on_prepare+0x286/0x400=0A> [ 679.468373] ? syscall_enter_from_u=
ser_mode+0x1d/0x50=0A> [ 679.469411] do_syscall_64+0x3d/0x90=0A> [ 679.47=
0174] entry_SYSCALL_64_after_hwframe+0x44/0xae=0A> [ 679.471191] RIP: 003=
3:0x7f040191917b=0A> [ 679.471961] Code: 0f 1e fa 48 8b 05 1d ad 0c 00 64=
 c7 00 26 00 00 00 48 c7 c0 ff ff ff ff c3 66=0A> 0f 1f 44 00 00 f3 0f 1e=
 fa b8 10 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d ed ac 0c 0=
0=0A> f7 d8 64 89 01 48=0A> [ 679.475467] RSP: 002b:00007ffce7c4a038 EFLA=
GS: 00000246 ORIG_RAX: 0000000000000010=0A> [ 679.477014] RAX: ffffffffff=
ffffda RBX: 00007ffce7c4a158 RCX: 00007f040191917b=0A> [ 679.478434] RDX:=
 00007ffce7c4a140 RSI: 00000000c0181b01 RDI: 0000000000000003=0A> [ 679.4=
79840] RBP: 00007ffce7c4a120 R08: 000055f8ae02d080 R09: 0000000000000000=
=0A> [ 679.481231] R10: 0000000000000000 R11: 0000000000000246 R12: 00007=
ffce7c4a120=0A> [ 679.482630] R13: 00007ffce7c4a110 R14: 000055f8ae02f440=
 R15: 0000000000000000=0A> [ 679.484003] </TASK>=0A> [ 679.484535] irq ev=
ent stamp: 62713=0A> [ 679.485313] hardirqs last enabled at (62723): [<ff=
ffffff81480f17>] __up_console_sem+0x67/0x70=0A> [ 679.487019] hardirqs la=
st disabled at (62730): [<ffffffff81480efc>] __up_console_sem+0x4c/0x70=
=0A> [ 679.488734] softirqs last enabled at (62220): [<ffffffff8135679f>]=
 __irq_exit_rcu+0x11f/0x170=0A> [ 679.490569] softirqs last disabled at (=
62215): [<ffffffff8135679f>] __irq_exit_rcu+0x11f/0x170=0A> [ 679.503168]=
 ---[ end trace 0000000000000000 ]---=0A> =0A> Fixes: 7c4a539ec38f ("RDMA=
/core: Fix ib_qp_usecnt_dec() called when error")=0A> Signed-off-by: Leon=
 Romanovsky <leonro@nvidia.com>=0A> ---=0A> drivers/infiniband/core/uverb=
s_cmd.c | 1 +=0A> drivers/infiniband/core/uverbs_std_types_qp.c | 1 +=0A>=
 drivers/infiniband/core/verbs.c | 3 ++-=0A> 3 files changed, 4 insertion=
s(+), 1 deletion(-)=0A> =0A> diff --git a/drivers/infiniband/core/uverbs_=
cmd.c b/drivers/infiniband/core/uverbs_cmd.c=0A> index 4437f834c0a7..6b63=
93176b3c 100644=0A> --- a/drivers/infiniband/core/uverbs_cmd.c=0A> +++ b/=
drivers/infiniband/core/uverbs_cmd.c=0A> @@ -1437,6 +1437,7 @@ static int=
 create_qp(struct uverbs_attr_bundle *attrs,=0A> ret =3D PTR_ERR(qp);=0A>=
 goto err_put;=0A> }=0A> + ib_qp_usecnt_inc(qp);=0A> =0A> obj->uevent.uob=
ject.object =3D qp;=0A> obj->uevent.event_file =3D READ_ONCE(attrs->ufile=
->default_async_file);=0A> diff --git a/drivers/infiniband/core/uverbs_st=
d_types_qp.c=0A> b/drivers/infiniband/core/uverbs_std_types_qp.c=0A> inde=
x 75353e09c6fe..dd1075466f61 100644=0A> --- a/drivers/infiniband/core/uve=
rbs_std_types_qp.c=0A> +++ b/drivers/infiniband/core/uverbs_std_types_qp.=
c=0A> @@ -254,6 +254,7 @@ static int UVERBS_HANDLER(UVERBS_METHOD_QP_CREA=
TE)(=0A> ret =3D PTR_ERR(qp);=0A> goto err_put;=0A> }=0A> + ib_qp_usecnt_=
inc(qp);=0A> =0A> if (attr.qp_type =3D=3D IB_QPT_XRC_TGT) {=0A> obj->uxrc=
d =3D container_of(xrcd_uobj, struct ib_uxrcd_object,=0A> diff --git a/dr=
ivers/infiniband/core/verbs.c b/drivers/infiniband/core/verbs.c=0A> index=
 bc9a83f1ca2d..a9819c40a140 100644=0A> --- a/drivers/infiniband/core/verb=
s.c=0A> +++ b/drivers/infiniband/core/verbs.c=0A> @@ -1245,7 +1245,6 @@ s=
tatic struct ib_qp *create_qp(struct ib_device *dev, struct ib_pd *pd,=0A=
> if (ret)=0A> goto err_security;=0A> =0A> - ib_qp_usecnt_inc(qp);=0A> rd=
ma_restrack_add(&qp->res);=0A> return qp;=0A> =0A> @@ -1346,6 +1345,8 @@ =
struct ib_qp *ib_create_qp_kernel(struct ib_pd *pd,=0A> if (IS_ERR(qp))=
=0A> return qp;=0A> =0A> + ib_qp_usecnt_inc(qp);=0A> +=0A> if (qp_init_at=
tr->cap.max_rdma_ctxs) {=0A> ret =3D rdma_rw_init_mrs(qp, qp_init_attr);=
=0A> if (ret)=0A> -- =0A> 2.35.1

----=_RainLoop_652_197531094.1646892774
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