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The following deadlock is observed:
Call Trace:
<IRQ>
_raw_spin_lock_bh+0x29/0x30
check_type_state.constprop.0+0x4e/0xc0 [rdma_rxe]
rxe_rcv+0x173/0x3d0 [rdma_rxe]
rxe_udp_encap_recv+0x69/0xd0 [rdma_rxe]
? __pfx_rxe_udp_encap_recv+0x10/0x10 [rdma_rxe]
udp_queue_rcv_one_skb+0x258/0x520
udp_unicast_rcv_skb+0x75/0x90
__udp4_lib_rcv+0x364/0x5c0
ip_protocol_deliver_rcu+0xa7/0x160
ip_local_deliver_finish+0x73/0xa0
ip_sublist_rcv_finish+0x80/0x90
ip_sublist_rcv+0x191/0x220
ip_list_rcv+0x132/0x160
__netif_receive_skb_list_core+0x297/0x2c0
netif_receive_skb_list_internal+0x1c5/0x300
napi_complete_done+0x6f/0x1b0
virtnet_poll+0x1f4/0x2d0 [virtio_net]
__napi_poll+0x2c/0x1b0
net_rx_action+0x293/0x350
? __napi_schedule+0x79/0x90
__do_softirq+0xcb/0x2ab
__irq_exit_rcu+0xb9/0xf0
common_interrupt+0x80/0xa0
</IRQ>
<TASK>
asm_common_interrupt+0x22/0x40
RIP: 0010:_raw_spin_lock+0x17/0x30
rxe_requester+0xe4/0x8f0 [rdma_rxe]
? xas_load+0x9/0xa0
? xa_load+0x70/0xb0
do_task+0x64/0x1f0 [rdma_rxe]
rxe_post_send+0x54/0x110 [rdma_rxe]
ib_uverbs_post_send+0x5f8/0x680 [ib_uverbs]
? netif_receive_skb_list_internal+0x1e3/0x300
ib_uverbs_write+0x3c8/0x500 [ib_uverbs]
vfs_write+0xc5/0x3b0
ksys_write+0xab/0xe0
? syscall_trace_enter.constprop.0+0x126/0x1a0
do_syscall_64+0x3b/0x90
entry_SYSCALL_64_after_hwframe+0x72/0xdc
</TASK>
The deadlock is easily reproducible with perftest. Fix it by disabling
softirq when acquiring the lock in process context.
Fixes: f605f26ea1 ("RDMA/rxe: Protect QP state with qp->state_lock")
Link: https://lore.kernel.org/r/20230418090642.1849358-1-matsuda-daisuke@fujitsu.com
Signed-off-by: Daisuke Matsuda <matsuda-daisuke@fujitsu.com>
Acked-by: Zhu Yanjun <zyjzyj2000@gmail.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
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https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.