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Message-ID: <20170313201045.GA23552@localhost.localdomain>
Date: Mon, 13 Mar 2017 17:10:45 -0300
From: Marcelo Ricardo Leitner <marcelo.leitner@...il.com>
To: Dave Jones <davej@...emonkey.org.uk>
Cc: netdev@...r.kernel.org, linux-sctp@...r.kernel.org,
Xin Long <lucien.xin@...il.com>
Subject: Re: [4.10+] sctp lockdep trace
On Fri, Feb 24, 2017 at 05:21:10PM -0500, Dave Jones wrote:
> [ 244.251557] ===============================
> [ 244.263321] [ ERR: suspicious RCU usage. ]
> [ 244.274982] 4.10.0-think+ #7 Not tainted
> [ 244.286511] -------------------------------
> [ 244.298008] ./include/linux/rhashtable.h:602 suspicious rcu_dereference_check() usage!
> [ 244.309665]
> other info that might help us debug this:
>
> [ 244.344629]
> rcu_scheduler_active = 2, debug_locks = 1
> [ 244.367839] 1 lock held by trinity-c30/1781:
> [ 244.379481] #0:
> [ 244.390848] (
> [ 244.402372] sk_lock-AF_INET
> [ 244.413825] ){+.+.+.}
> [ 244.425231] , at: [<ffffffffa0302fd0>] sctp_sendmsg+0x330/0xfe0 [sctp]
> [ 244.436774]
> stack backtrace:
> [ 244.459620] CPU: 3 PID: 1781 Comm: trinity-c30 Not tainted 4.10.0-think+ #7
> [ 244.482790] Call Trace:
> [ 244.494201] dump_stack+0x68/0x93
> [ 244.505598] lockdep_rcu_suspicious+0xce/0xf0
> [ 244.516924] sctp_hash_transport+0x406/0x7e0 [sctp]
> [ 244.528137] ? sctp_endpoint_bh_rcv+0x171/0x290 [sctp]
> [ 244.539243] sctp_assoc_add_peer+0x290/0x3c0 [sctp]
> [ 244.550291] sctp_sendmsg+0x8f7/0xfe0 [sctp]
> [ 244.561258] ? rw_copy_check_uvector+0x8e/0x190
> [ 244.572308] ? import_iovec+0x3a/0xe0
> [ 244.583232] inet_sendmsg+0x49/0x1e0
> [ 244.594150] ___sys_sendmsg+0x2d4/0x300
> [ 244.605002] ? debug_smp_processor_id+0x17/0x20
> [ 244.615844] ? debug_smp_processor_id+0x17/0x20
> [ 244.626533] ? get_lock_stats+0x19/0x50
> [ 244.637141] __sys_sendmsg+0x54/0x90
> [ 244.647817] SyS_sendmsg+0x12/0x20
> [ 244.658400] do_syscall_64+0x66/0x1d0
> [ 244.668990] entry_SYSCALL64_slow_path+0x25/0x25
> [ 244.679582] RIP: 0033:0x7fe095fcb0f9
> [ 244.690079] RSP: 002b:00007ffc5601b1d8 EFLAGS: 00000246
> [ 244.700704] ORIG_RAX: 000000000000002e
> [ 244.711248] RAX: ffffffffffffffda RBX: 000000000000002e RCX: 00007fe095fcb0f9
> [ 244.721818] RDX: 0000000000000080 RSI: 00005592de12ddc0 RDI: 000000000000012d
> [ 244.732282] RBP: 00007fe0965c8000 R08: 000000000000c000 R09: 00000000000000dc
> [ 244.742576] R10: 0003021200000088 R11: 0000000000000246 R12: 0000000000000002
> [ 244.752804] R13: 00007fe0965c8048 R14: 00007fe0966a1ad8 R15: 00007fe0965c8000
>
> [ 244.775549] ===============================
> [ 244.785875] [ ERR: suspicious RCU usage. ]
> [ 244.796951] 4.10.0-think+ #7 Not tainted
> [ 244.807185] -------------------------------
> [ 244.819213] ./include/linux/rhashtable.h:605 suspicious rcu_dereference_check() usage!
> [ 244.829420]
> other info that might help us debug this:
>
> [ 244.859963]
> rcu_scheduler_active = 2, debug_locks = 1
> [ 244.879766] 1 lock held by trinity-c30/1781:
> [ 244.889953] #0:
> [ 244.900000] (
> [ 244.909854] sk_lock-AF_INET
> [ 244.919645] ){+.+.+.}
> [ 244.929238] , at: [<ffffffffa0302fd0>] sctp_sendmsg+0x330/0xfe0 [sctp]
> [ 244.939167]
> stack backtrace:
> [ 244.958506] CPU: 3 PID: 1781 Comm: trinity-c30 Not tainted 4.10.0-think+ #7
> [ 244.978102] Call Trace:
> [ 244.987735] dump_stack+0x68/0x93
> [ 244.997112] lockdep_rcu_suspicious+0xce/0xf0
> [ 245.006588] sctp_hash_transport+0x4ca/0x7e0 [sctp]
> [ 245.016264] ? sctp_endpoint_bh_rcv+0x171/0x290 [sctp]
> [ 245.025797] sctp_assoc_add_peer+0x290/0x3c0 [sctp]
> [ 245.035380] sctp_sendmsg+0x8f7/0xfe0 [sctp]
> [ 245.044883] ? rw_copy_check_uvector+0x8e/0x190
> [ 245.054464] ? import_iovec+0x3a/0xe0
> [ 245.064016] inet_sendmsg+0x49/0x1e0
> [ 245.073516] ___sys_sendmsg+0x2d4/0x300
> [ 245.082967] ? debug_smp_processor_id+0x17/0x20
> [ 245.092448] ? debug_smp_processor_id+0x17/0x20
> [ 245.101850] ? get_lock_stats+0x19/0x50
> [ 245.111170] __sys_sendmsg+0x54/0x90
> [ 245.120451] SyS_sendmsg+0x12/0x20
> [ 245.129649] do_syscall_64+0x66/0x1d0
> [ 245.138783] entry_SYSCALL64_slow_path+0x25/0x25
> [ 245.147678] RIP: 0033:0x7fe095fcb0f9
> [ 245.156588] RSP: 002b:00007ffc5601b1d8 EFLAGS: 00000246
> [ 245.165503] ORIG_RAX: 000000000000002e
> [ 245.174601] RAX: ffffffffffffffda RBX: 000000000000002e RCX: 00007fe095fcb0f9
> [ 245.183861] RDX: 0000000000000080 RSI: 00005592de12ddc0 RDI: 000000000000012d
> [ 245.193038] RBP: 00007fe0965c8000 R08: 000000000000c000 R09: 00000000000000dc
> [ 245.202214] R10: 0003021200000088 R11: 0000000000000246 R12: 0000000000000002
> [ 245.211261] R13: 00007fe0965c8048 R14: 00007fe0966a1ad8 R15: 00007fe0965c8000
>
> [ 245.308216] ===============================
> [ 245.317295] [ ERR: suspicious RCU usage. ]
> [ 245.327876] 4.10.0-think+ #7 Not tainted
> [ 245.337065] -------------------------------
> [ 245.345840] ./include/linux/rhashtable.h:616 suspicious rcu_dereference_check() usage!
> [ 245.356501]
> other info that might help us debug this:
>
> [ 245.382185]
> rcu_scheduler_active = 2, debug_locks = 1
> [ 245.399415] 1 lock held by trinity-c30/1781:
> [ 245.408138] #0:
> [ 245.416594] (
> [ 245.424928] sk_lock-AF_INET
> [ 245.433279] ){+.+.+.}
> [ 245.441889] , at: [<ffffffffa0302fd0>] sctp_sendmsg+0x330/0xfe0 [sctp]
> [ 245.450167]
> stack backtrace:
> [ 245.466352] CPU: 3 PID: 1781 Comm: trinity-c30 Not tainted 4.10.0-think+ #7
> [ 245.482894] Call Trace:
> [ 245.491096] dump_stack+0x68/0x93
> [ 245.499314] lockdep_rcu_suspicious+0xce/0xf0
> [ 245.507610] sctp_hash_transport+0x6c0/0x7e0 [sctp]
> [ 245.515972] ? sctp_endpoint_bh_rcv+0x171/0x290 [sctp]
> [ 245.524366] sctp_assoc_add_peer+0x290/0x3c0 [sctp]
> [ 245.532736] sctp_sendmsg+0x8f7/0xfe0 [sctp]
> [ 245.541040] ? rw_copy_check_uvector+0x8e/0x190
> [ 245.549402] ? import_iovec+0x3a/0xe0
> [ 245.557679] inet_sendmsg+0x49/0x1e0
> [ 245.565887] ___sys_sendmsg+0x2d4/0x300
> [ 245.574092] ? debug_smp_processor_id+0x17/0x20
> [ 245.582342] ? debug_smp_processor_id+0x17/0x20
> [ 245.590508] ? get_lock_stats+0x19/0x50
> [ 245.598641] __sys_sendmsg+0x54/0x90
> [ 245.606745] SyS_sendmsg+0x12/0x20
> [ 245.614784] do_syscall_64+0x66/0x1d0
> [ 245.622828] entry_SYSCALL64_slow_path+0x25/0x25
> [ 245.630894] RIP: 0033:0x7fe095fcb0f9
> [ 245.638962] RSP: 002b:00007ffc5601b1d8 EFLAGS: 00000246
> [ 245.647071] ORIG_RAX: 000000000000002e
> [ 245.655186] RAX: ffffffffffffffda RBX: 000000000000002e RCX: 00007fe095fcb0f9
> [ 245.663435] RDX: 0000000000000080 RSI: 00005592de12ddc0 RDI: 000000000000012d
> [ 245.671776] RBP: 00007fe0965c8000 R08: 000000000000c000 R09: 00000000000000dc
> [ 245.680111] R10: 0003021200000088 R11: 0000000000000246 R12: 0000000000000002
> [ 245.688460] R13: 00007fe0965c8048 R14: 00007fe0966a1ad8 R15: 00007fe0965c8000
>
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