Hi Guys,
I just hit this with 4.9-rc4 on my test vm.
Didn't find any patches on the list so maybe this
is new?
[ 12.392197] ===============================
[ 12.392927] [ INFO: suspicious RCU usage. ]
[ 12.393625] 4.9.0-rc4-e386eaffebc4-lb #25 Tainted: G OE
[ 12.394633] -------------------------------
[ 12.395317] drivers/net/ethernet/mellanox/mlx4/en_rx.c:543 suspicious
rcu_dereference_protected() usage!
[ 12.396873]
other info that might help us debug this:
[ 12.398134]
rcu_scheduler_active = 1, debug_locks = 0
[ 12.399107] 1 lock held by rmmod/707:
[ 12.399665] #0:
[ 12.399939] (
[ 12.400230] intf_mutex
[ 12.400378] ){+.+.+.}
[ 12.400805] , at:
[ 12.401139] [<ffffffffc015e93d>] mlx4_unregister_interface+0x1d/0x70
[mlx4_core]
[ 12.402275]
stack backtrace:
[ 12.402926] CPU: 3 PID: 707 Comm: rmmod Tainted: G OE
4.9.0-rc4-e386eaffebc4-lb #25
[ 12.404221] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996),
BIOS Ubuntu-1.8.2-1ubuntu1 04/01/2014
[ 12.405619] ffffb5fdc0fcfda0 ffffffffb6450643 ffff951f787b22c0
0000000000000001
[ 12.406793] ffffb5fdc0fcfdd0 ffffffffb60e78f7 ffff951f73966000
0000000000000400
[ 12.407966] ffff951f70430ad8 ffff951f73584800 ffffb5fdc0fcfe08
ffffffffc020f77a
[ 12.409069] Call Trace:
[ 12.409437] [<ffffffffb6450643>] dump_stack+0x85/0xc2
[ 12.410151] [<ffffffffb60e78f7>] lockdep_rcu_suspicious+0xd7/0x110
[ 12.411024] [<ffffffffc020f77a>] mlx4_en_destroy_rx_ring+0xba/0xc0
[mlx4_en]
[ 12.412032] [<ffffffffc0215ec6>] mlx4_en_free_resources+0xb6/0xf0
[mlx4_en]
[ 12.413006] [<ffffffffc021abe2>] mlx4_en_destroy_netdev+0xe2/0x1b0
[mlx4_en]
[ 12.413994] [<ffffffffc020b105>] mlx4_en_remove+0xe5/0xf0 [mlx4_en]
[ 12.414883] [<ffffffffc015e903>] mlx4_remove_device+0x73/0x90
[mlx4_core]
[ 12.415844] [<ffffffffc015e95e>] mlx4_unregister_interface+0x3e/0x70
[mlx4_core]
[ 12.416880] [<ffffffffc021dd6b>] mlx4_en_cleanup+0x10/0x2a5 [mlx4_en]
[ 12.417773] [<ffffffffb613322a>] SyS_delete_module+0x1ba/0x220
[ 12.418545] [<ffffffffb68e3085>] entry_SYSCALL_64_fastpath+0x23/0xc6
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