* v5.15-rc1 issue with the soft-iWARP driver
@ 2021-09-15 4:54 Bart Van Assche
2021-09-15 14:34 ` Jason Gunthorpe
2021-09-16 19:18 ` Bernard Metzler
0 siblings, 2 replies; 3+ messages in thread
From: Bart Van Assche @ 2021-09-15 4:54 UTC (permalink / raw)
To: linux-rdma, Jason Gunthorpe
Hi,
If I run test srp/015 from the blktests suite then the following appears
in the kernel log:
==================================================================
BUG: KASAN: null-ptr-deref in __list_del_entry_valid+0x4d/0xe0
Read of size 8 at addr 0000000000000000 by task kworker/u16:3/161
CPU: 5 PID: 161 Comm: kworker/u16:3 Not tainted 5.15.0-rc1-dbg+ #2
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.14.0-0-g155821a-rebuilt.opensuse.org 04/01/2014
Workqueue: iw_cm_wq cm_work_handler [iw_cm]
Call Trace:
show_stack+0x52/0x58
dump_stack_lvl+0x5b/0x82
kasan_report.cold+0x52/0x57
__asan_load8+0x69/0x90
__list_del_entry_valid+0x4d/0xe0
_cma_cancel_listens+0x49/0x230 [rdma_cm]
_destroy_id+0x4e/0x420 [rdma_cm]
destroy_id_handler_unlock+0xc4/0x200 [rdma_cm]
iw_conn_req_handler+0x335/0x370 [rdma_cm]
cm_conn_req_handler+0x546/0x7d0 [iw_cm]
cm_work_handler+0x419/0x480 [iw_cm]
process_one_work+0x59d/0xb00
worker_thread+0x8f/0x5c0
kthread+0x1fc/0x230
ret_from_fork+0x1f/0x30
==================================================================
I think this is a regression. This happened with commit a17a1faf5d3e
("RDMA/cma: Fix listener leak in rdma_cma_listen_on_all() failure").
Thanks,
Bart.
^ permalink raw reply [flat|nested] 3+ messages in thread* Re: v5.15-rc1 issue with the soft-iWARP driver
2021-09-15 4:54 v5.15-rc1 issue with the soft-iWARP driver Bart Van Assche
@ 2021-09-15 14:34 ` Jason Gunthorpe
2021-09-16 19:18 ` Bernard Metzler
1 sibling, 0 replies; 3+ messages in thread
From: Jason Gunthorpe @ 2021-09-15 14:34 UTC (permalink / raw)
To: Bart Van Assche; +Cc: linux-rdma
On Tue, Sep 14, 2021 at 09:54:27PM -0700, Bart Van Assche wrote:
> Hi,
>
> If I run test srp/015 from the blktests suite then the following appears
> in the kernel log:
>
> ==================================================================
> BUG: KASAN: null-ptr-deref in __list_del_entry_valid+0x4d/0xe0
> Read of size 8 at addr 0000000000000000 by task kworker/u16:3/161
>
> CPU: 5 PID: 161 Comm: kworker/u16:3 Not tainted 5.15.0-rc1-dbg+ #2
> Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.14.0-0-g155821a-rebuilt.opensuse.org 04/01/2014
> Workqueue: iw_cm_wq cm_work_handler [iw_cm]
> Call Trace:
> show_stack+0x52/0x58
> dump_stack_lvl+0x5b/0x82
> kasan_report.cold+0x52/0x57
> __asan_load8+0x69/0x90
> __list_del_entry_valid+0x4d/0xe0
> _cma_cancel_listens+0x49/0x230 [rdma_cm]
> _destroy_id+0x4e/0x420 [rdma_cm]
> destroy_id_handler_unlock+0xc4/0x200 [rdma_cm]
> iw_conn_req_handler+0x335/0x370 [rdma_cm]
> cm_conn_req_handler+0x546/0x7d0 [iw_cm]
> cm_work_handler+0x419/0x480 [iw_cm]
> process_one_work+0x59d/0xb00
> worker_thread+0x8f/0x5c0
> kthread+0x1fc/0x230
> ret_from_fork+0x1f/0x30
> ==================================================================
>
> I think this is a regression. This happened with commit a17a1faf5d3e
> ("RDMA/cma: Fix listener leak in rdma_cma_listen_on_all() failure").
Gurk, this is a horrific mess, these list heads are multiplexing between
4 different roles depending on stuff. Thanks Bart
So let's go closer to the original patch:
From ca465e1f1f9b38fe916a36f7d80c5d25f2337c81 Mon Sep 17 00:00:00 2001
From: Tao Liu <thomas.liu@ucloud.cn>
Date: Mon, 13 Sep 2021 17:33:44 +0800
Subject: [PATCH] RDMA/cma: Fix listener leak in rdma_cma_listen_on_all()
failure
If cma_listen_on_all() fails it leaves the per-device ID still on the
listen_list but the state is not set to RDMA_CM_ADDR_BOUND.
When the cmid is eventually destroyed cma_cancel_listens() is not called
due to the wrong state, however the per-device IDs are still holding the
refcount preventing the ID from being destroyed, thus deadlocking:
task:rping state:D stack: 0 pid:19605 ppid: 47036 flags:0x00000084
Call Trace:
__schedule+0x29a/0x780
? free_unref_page_commit+0x9b/0x110
schedule+0x3c/0xa0
schedule_timeout+0x215/0x2b0
? __flush_work+0x19e/0x1e0
wait_for_completion+0x8d/0xf0
_destroy_id+0x144/0x210 [rdma_cm]
ucma_close_id+0x2b/0x40 [rdma_ucm]
__destroy_id+0x93/0x2c0 [rdma_ucm]
? __xa_erase+0x4a/0xa0
ucma_destroy_id+0x9a/0x120 [rdma_ucm]
ucma_write+0xb8/0x130 [rdma_ucm]
vfs_write+0xb4/0x250
ksys_write+0xb5/0xd0
? syscall_trace_enter.isra.19+0x123/0x190
do_syscall_64+0x33/0x40
entry_SYSCALL_64_after_hwframe+0x44/0xa9
Ensure that cma_listen_on_all() atomically unwinds its action under the
lock during error.
Fixes: c80a0c52d85c ("RDMA/cma: Add missing error handling of listen_id")
Link: https://lore.kernel.org/r/20210913093344.17230-1-thomas.liu@ucloud.cn
Signed-off-by: Tao Liu <thomas.liu@ucloud.cn>
Reviewed-by: Leon Romanovsky <leonro@nvidia.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
---
drivers/infiniband/core/cma.c | 13 ++++++++++---
1 file changed, 10 insertions(+), 3 deletions(-)
diff --git a/drivers/infiniband/core/cma.c b/drivers/infiniband/core/cma.c
index 86ee3b01b3ee47..5aa58897965df4 100644
--- a/drivers/infiniband/core/cma.c
+++ b/drivers/infiniband/core/cma.c
@@ -1746,15 +1746,16 @@ static void cma_cancel_route(struct rdma_id_private *id_priv)
}
}
-static void cma_cancel_listens(struct rdma_id_private *id_priv)
+static void _cma_cancel_listens(struct rdma_id_private *id_priv)
{
struct rdma_id_private *dev_id_priv;
+ lockdep_assert_held(&lock);
+
/*
* Remove from listen_any_list to prevent added devices from spawning
* additional listen requests.
*/
- mutex_lock(&lock);
list_del(&id_priv->list);
while (!list_empty(&id_priv->listen_list)) {
@@ -1768,6 +1769,12 @@ static void cma_cancel_listens(struct rdma_id_private *id_priv)
rdma_destroy_id(&dev_id_priv->id);
mutex_lock(&lock);
}
+}
+
+static void cma_cancel_listens(struct rdma_id_private *id_priv)
+{
+ mutex_lock(&lock);
+ _cma_cancel_listens(id_priv);
mutex_unlock(&lock);
}
@@ -2579,7 +2586,7 @@ static int cma_listen_on_all(struct rdma_id_private *id_priv)
return 0;
err_listen:
- list_del(&id_priv->list);
+ _cma_cancel_listens(id_priv);
mutex_unlock(&lock);
if (to_destroy)
rdma_destroy_id(&to_destroy->id);
--
2.33.0
^ permalink raw reply related [flat|nested] 3+ messages in thread* Re: v5.15-rc1 issue with the soft-iWARP driver
2021-09-15 4:54 v5.15-rc1 issue with the soft-iWARP driver Bart Van Assche
2021-09-15 14:34 ` Jason Gunthorpe
@ 2021-09-16 19:18 ` Bernard Metzler
1 sibling, 0 replies; 3+ messages in thread
From: Bernard Metzler @ 2021-09-16 19:18 UTC (permalink / raw)
To: Bart Van Assche; +Cc: linux-rdma, Jason Gunthorpe
-----"Bart Van Assche" <bvanassche@acm.org> wrote: -----
>To: linux-rdma@vger.kernel.org, "Jason Gunthorpe" <jgg@nvidia.com>
>From: "Bart Van Assche" <bvanassche@acm.org>
>Date: 09/15/2021 06:54AM
>Subject: [EXTERNAL] v5.15-rc1 issue with the soft-iWARP driver
>
>Hi,
>
>If I run test srp/015 from the blktests suite then the following
>appears
>in the kernel log:
>
>==================================================================
>BUG: KASAN: null-ptr-deref in __list_del_entry_valid+0x4d/0xe0
>Read of size 8 at addr 0000000000000000 by task kworker/u16:3/161
>
>CPU: 5 PID: 161 Comm: kworker/u16:3 Not tainted 5.15.0-rc1-dbg+ #2
>Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS
>rel-1.14.0-0-g155821a-rebuilt.opensuse.org 04/01/2014
>Workqueue: iw_cm_wq cm_work_handler [iw_cm]
>Call Trace:
> show_stack+0x52/0x58
> dump_stack_lvl+0x5b/0x82
> kasan_report.cold+0x52/0x57
> __asan_load8+0x69/0x90
> __list_del_entry_valid+0x4d/0xe0
> _cma_cancel_listens+0x49/0x230 [rdma_cm]
> _destroy_id+0x4e/0x420 [rdma_cm]
> destroy_id_handler_unlock+0xc4/0x200 [rdma_cm]
> iw_conn_req_handler+0x335/0x370 [rdma_cm]
> cm_conn_req_handler+0x546/0x7d0 [iw_cm]
> cm_work_handler+0x419/0x480 [iw_cm]
> process_one_work+0x59d/0xb00
> worker_thread+0x8f/0x5c0
> kthread+0x1fc/0x230
> ret_from_fork+0x1f/0x30
>==================================================================
>
>I think this is a regression. This happened with commit a17a1faf5d3e
>("RDMA/cma: Fix listener leak in rdma_cma_listen_on_all() failure").
>
So far I could not reproduce it with that patch (tried to get better
understanding with siw debugging enabled). That doesn't mean much.
But I do see issues with rxe if running the complete srp set from
blktest, which seem to be unrelated. I'll send an extra message.
Many thanks,
Bernard.
^ permalink raw reply [flat|nested] 3+ messages in thread
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2021-09-15 14:34 ` Jason Gunthorpe
2021-09-16 19:18 ` Bernard Metzler
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