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From: Leon Romanovsky <leon@kernel.org>
To: Jason Gunthorpe <jgg@ziepe.ca>
Cc: Doug Ledford <dledford@redhat.com>,
	RDMA mailing list <linux-rdma@vger.kernel.org>,
	Daniel Jurgens <danielj@mellanox.com>,
	Erez Shitrit <erezsh@mellanox.com>,
	Maor Gottlieb <maorg@mellanox.com>,
	Michael Guralnik <michaelgur@mellanox.com>,
	Moni Shoua <monis@mellanox.com>,
	Parav Pandit <parav@mellanox.com>,
	Sean Hefty <sean.hefty@intel.com>,
	Valentine Fatiev <valentinef@mellanox.com>,
	Yishai Hadas <yishaih@mellanox.com>,
	Yonatan Cohen <yonatanc@mellanox.com>,
	Zhu Yanjun <yanjunz@mellanox.com>
Subject: Re: [PATCH rdma-rc 8/9] IB/umad: Fix kernel crash while unloading ib_umad
Date: Thu, 13 Feb 2020 20:03:55 +0200
Message-ID: <20200213180355.GF679970@unreal> (raw)
In-Reply-To: <20200213142818.GA16120@ziepe.ca>

On Thu, Feb 13, 2020 at 10:28:18AM -0400, Jason Gunthorpe wrote:
> On Wed, Feb 12, 2020 at 09:26:34AM +0200, Leon Romanovsky wrote:
> > From: Yonatan Cohen <yonatanc@mellanox.com>
> >
> > When unloading ib_umad, remove ibdev sys file 1st before
> > port removal to prevent kernel oops.
> >
> > ib_mad's method ibdev_show() might access a umad port
> > whoes ibdev field has already been NULLed when rmmod ib_umad
> > was issued from another shell.
> >
> > Consider this scenario
> > 	         shell-1            	shell-2
> > 	        rmmod ib_mod    	cat /sys/devices/../ibdev
> > 	            |           		|
> > 	        ib_umad_kill_port()        ibdev_show()
> > 	     port->ib_dev = NULL	dev_name(port->ib_dev)
> >
> > kernel stack
> > PF: error_code(0x0000) - not-present page
> > Oops: 0000 [#1] SMP DEBUG_PAGEALLOC PTI
> > RIP: 0010:ibdev_show+0x18/0x50 [ib_umad]
> > RSP: 0018:ffffc9000097fe40 EFLAGS: 00010282
> > RAX: 0000000000000000 RBX: ffffffffa0441120 RCX: ffff8881df514000
> > RDX: ffff8881df514000 RSI: ffffffffa0441120 RDI: ffff8881df1e8870
> > RBP: ffffffff81caf000 R08: ffff8881df1e8870 R09: 0000000000000000
> > R10: 0000000000001000 R11: 0000000000000003 R12: ffff88822f550b40
> > R13: 0000000000000001 R14: ffffc9000097ff08 R15: ffff8882238bad58
> > FS:  00007f1437ff3740(0000) GS:ffff888236940000(0000) knlGS:0000000000000000
> > CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> > CR2: 00000000000004e8 CR3: 00000001e0dfc001 CR4: 00000000001606e0
> > Call Trace:
> >  dev_attr_show+0x15/0x50
> >  sysfs_kf_seq_show+0xb8/0x1a0
> >  seq_read+0x12d/0x350
> >  vfs_read+0x89/0x140
> >  ksys_read+0x55/0xd0
> >  do_syscall_64+0x55/0x1b0
> >  entry_SYSCALL_64_after_hwframe+0x44/0xa9:
> >
> > Fixes: e9dd5daf884c ("IB/umad: Refactor code to use cdev_device_add()")
>
> This is the wrong fixes line, this ordering change was actually
> deliberately done:
>

Can you please fix the fixes line, so I will resend unaccepted patches only?

Thanks

  reply index

Thread overview: 25+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-02-12  7:26 [PATCH rdma-rc 0/9] Fixes for v5.6 Leon Romanovsky
2020-02-12  7:26 ` [PATCH rdma-rc 1/9] RDMA/ucma: Mask QPN to be 24 bits according to IBTA Leon Romanovsky
2020-02-12  7:26 ` [PATCH rdma-rc 2/9] RDMA/core: Fix protection fault in get_pkey_idx_qp_list Leon Romanovsky
2020-02-12  8:01   ` Leon Romanovsky
2020-02-12  8:06   ` Leon Romanovsky
2020-02-12  7:26 ` [PATCH rdma-rc 3/9] Revert "RDMA/cma: Simplify rdma_resolve_addr() error flow" Leon Romanovsky
2020-02-13 13:30   ` Jason Gunthorpe
2020-02-14  3:11     ` Parav Pandit
2020-02-14 14:08       ` Jason Gunthorpe
2020-02-14 14:48         ` Parav Pandit
2020-02-19 20:40   ` Jason Gunthorpe
2020-02-12  7:26 ` [PATCH rdma-rc 4/9] IB/ipoib: Fix double free of skb in case of multicast traffic in CM mode Leon Romanovsky
2020-02-13 15:37   ` Jason Gunthorpe
2020-02-13 18:10     ` Leon Romanovsky
2020-02-13 18:26       ` Jason Gunthorpe
2020-02-13 18:36         ` Leon Romanovsky
2020-02-13 19:09           ` Jason Gunthorpe
2020-02-12  7:26 ` [PATCH rdma-rc 5/9] RDMA/core: Add missing list deletion on freeing event queue Leon Romanovsky
2020-02-12  7:26 ` [PATCH rdma-rc 6/9] IB/mlx5: Fix async events cleanup flows Leon Romanovsky
2020-02-12  7:26 ` [PATCH rdma-rc 7/9] RDMA/rxe: Fix soft lockup problem due to using tasklets in softirq Leon Romanovsky
2020-02-12  7:26 ` [PATCH rdma-rc 8/9] IB/umad: Fix kernel crash while unloading ib_umad Leon Romanovsky
2020-02-13 14:28   ` Jason Gunthorpe
2020-02-13 18:03     ` Leon Romanovsky [this message]
2020-02-12  7:26 ` [PATCH rdma-rc 9/9] RDMA/mlx5: Prevent overflow in mmap offset calculations Leon Romanovsky
2020-02-13 18:03 ` [PATCH rdma-rc 0/9] Fixes for v5.6 Jason Gunthorpe

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