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Date: Wed, 22 Sep 2010 17:58:08 +0900
From: Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
To: eric.dumazet@...il.com
Cc: linux-fsdevel@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [2.6.36-rc5] INET?: possible irq lock inversion dependency
> Updated and booted/tested patch :
The warning by test.sh disappeared by your patch.
But the warning which I encounter upon reboot still appears.
[ 74.289683] nfsd: last server has exited, flushing export cache
[ 75.935807]
[ 75.935811] =========================================================
[ 75.937431] [ INFO: possible irq lock inversion dependency detected ]
[ 75.937431] 2.6.36-rc5 #2
[ 75.937431] ---------------------------------------------------------
[ 75.937431] kworker/1:1/418 just changed the state of lock:
[ 75.937431] (clock-AF_INET#2){++.?..}, at: [<c135ddee>] xs_tcp_state_change+0x1e/0x1d0
[ 75.937431] but this lock was taken by another, SOFTIRQ-safe lock in the past:
[ 75.937431] (slock-AF_INET){+.-...}
[ 75.937431]
[ 75.937431] and interrupts could create inverse lock ordering between them.
[ 75.937431]
[ 75.937431]
[ 75.937431] other info that might help us debug this:
[ 75.937431] 3 locks held by kworker/1:1/418:
[ 75.937431] #0: (rpciod){+.+.+.}, at: [<c10514d6>] process_one_work+0xd6/0x3a0
[ 75.937431] #1: ((&xprt->task_cleanup)){+.+...}, at: [<c10514d6>] process_one_work+0xd6/0x3a0
[ 75.937431] #2: (sk_lock-AF_INET-RPC){+.+...}, at: [<c1332549>] inet_shutdown+0x49/0x110
[ 75.937431]
[ 75.937431] the shortest dependencies between 2nd lock and 1st lock:
[ 75.937431] -> (slock-AF_INET){+.-...} ops: 1648 {
[ 75.937431] HARDIRQ-ON-W at:
[ 75.937431] [<c106a8de>] mark_irqflags+0xfe/0x180
[ 75.937431] [<c106b65d>] __lock_acquire+0x38d/0x8e0
[ 75.937431] [<c106cbfa>] lock_acquire+0x7a/0xa0
[ 75.937431] [<c138be6e>] _raw_spin_lock_bh+0x3e/0x80
[ 75.937431] [<c12daf79>] lock_sock_fast+0x29/0x90
[ 75.937431] [<c132b1e4>] udp_destroy_sock+0x14/0x40
[ 75.937431] [<c12db2d3>] sk_common_release+0xb3/0xc0
[ 75.937431] [<c132bb58>] udp_lib_close+0x8/0x10
[ 75.937431] [<c1331abe>] inet_release+0xbe/0x100
[ 75.937431] [<c12d5476>] sock_release+0x66/0x80
[ 75.937431] [<c12d61f2>] sock_close+0x12/0x30
[ 75.937431] [<c10c637b>] __fput+0x1cb/0x240
[ 75.937431] [<c10c6409>] fput+0x19/0x20
[ 75.937431] [<c10c4263>] filp_close+0x43/0x70
[ 75.937431] [<c103fdcd>] close_files+0xad/0x150
[ 75.937431] [<c103fed9>] put_files_struct+0x29/0xf0
[ 75.937431] [<c1040030>] exit_files+0x40/0x50
[ 75.937431] [<c10406f6>] do_exit+0x116/0x2e0
[ 75.937431] [<c1040924>] do_group_exit+0x34/0xb0
[ 75.937431] [<c10409af>] sys_exit_group+0xf/0x20
[ 75.937431] [<c138c911>] syscall_call+0x7/0xb
[ 75.937431] IN-SOFTIRQ-W at:
[ 75.937431] [<c106a8fe>] mark_irqflags+0x11e/0x180
[ 75.937431] [<c106b65d>] __lock_acquire+0x38d/0x8e0
[ 75.937431] [<c106cbfa>] lock_acquire+0x7a/0xa0
[ 75.937431] [<c138bcf9>] _raw_spin_lock+0x39/0x70
[ 75.937431] [<c12d98d1>] sk_clone+0xb1/0x2e0
[ 75.937431] [<c130fdba>] inet_csk_clone+0x1a/0xb0
[ 75.937431] [<c132539c>] tcp_create_openreq_child+0x1c/0x460
[ 75.937431] [<c1322a6f>] tcp_v4_syn_recv_sock+0x3f/0x1e0
[ 75.937431] [<c132596c>] tcp_check_req+0x18c/0x3b0
[ 75.937431] [<c1322c5d>] tcp_v4_hnd_req+0x4d/0x160
[ 75.937431] [<c1322f89>] tcp_v4_do_rcv+0x159/0x280
[ 75.937431] [<c1323624>] tcp_v4_rcv+0x574/0xa30
[ 75.937431] [<c1305483>] ip_local_deliver_finish+0x103/0x320
[ 75.937431] [<c13056d0>] ip_local_deliver+0x30/0x40
[ 75.937431] [<c1305849>] ip_rcv_finish+0x169/0x480
[ 75.937431] [<c1305cfa>] ip_rcv+0x19a/0x2b0
[ 75.937431] [<c12e695d>] __netif_receive_skb+0x21d/0x310
[ 75.937431] [<c12e7468>] process_backlog+0x88/0x160
[ 75.937431] [<c12e7837>] net_rx_action+0x127/0x140
[ 75.937431] [<c1042e70>] __do_softirq+0xd0/0x130
[ 75.937431] INITIAL USE at:
[ 75.937431] [<c106b490>] __lock_acquire+0x1c0/0x8e0
[ 75.937431] [<c106cbfa>] lock_acquire+0x7a/0xa0
[ 75.937431] [<c138be6e>] _raw_spin_lock_bh+0x3e/0x80
[ 75.937431] [<c12daf79>] lock_sock_fast+0x29/0x90
[ 75.937431] [<c132b1e4>] udp_destroy_sock+0x14/0x40
[ 75.937431] [<c12db2d3>] sk_common_release+0xb3/0xc0
[ 75.937431] [<c132bb58>] udp_lib_close+0x8/0x10
[ 75.937431] [<c1331abe>] inet_release+0xbe/0x100
[ 75.937431] [<c12d5476>] sock_release+0x66/0x80
[ 75.937431] [<c12d61f2>] sock_close+0x12/0x30
[ 75.937431] [<c10c637b>] __fput+0x1cb/0x240
[ 75.937431] [<c10c6409>] fput+0x19/0x20
[ 75.937431] [<c10c4263>] filp_close+0x43/0x70
[ 75.937431] [<c103fdcd>] close_files+0xad/0x150
[ 75.937431] [<c103fed9>] put_files_struct+0x29/0xf0
[ 75.937431] [<c1040030>] exit_files+0x40/0x50
[ 75.937431] [<c10406f6>] do_exit+0x116/0x2e0
[ 75.937431] [<c1040924>] do_group_exit+0x34/0xb0
[ 75.937431] [<c10409af>] sys_exit_group+0xf/0x20
[ 75.937431] [<c138c911>] syscall_call+0x7/0xb
[ 75.937431] }
[ 75.937431] ... key at: [<c1d4c9d0>] af_family_slock_keys+0x10/0x140
[ 75.937431] ... acquired at:
[ 75.937431] [<c106910b>] check_prevs_add+0xab/0x100
[ 75.937431] [<c1069495>] validate_chain+0x305/0x5a0
[ 75.937431] [<c106b57d>] __lock_acquire+0x2ad/0x8e0
[ 75.937431] [<c106cbfa>] lock_acquire+0x7a/0xa0
[ 75.937431] [<c138c4ae>] _raw_write_lock_bh+0x3e/0x80
[ 75.937431] [<c13100e6>] inet_csk_listen_stop+0x86/0x160
[ 75.937431] [<c1312c42>] tcp_close+0x382/0x390
[ 75.937431] [<c1331abe>] inet_release+0xbe/0x100
[ 75.937431] [<c12d5476>] sock_release+0x66/0x80
[ 75.937431] [<c12d61f2>] sock_close+0x12/0x30
[ 75.937431] [<c10c637b>] __fput+0x1cb/0x240
[ 75.937431] [<c10c6409>] fput+0x19/0x20
[ 75.937431] [<c10c4263>] filp_close+0x43/0x70
[ 75.937431] [<c10c42fd>] sys_close+0x6d/0x110
[ 75.937431] [<c138c911>] syscall_call+0x7/0xb
[ 75.937431]
[ 75.937431] -> (clock-AF_INET#2){++.?..} ops: 96 {
[ 75.937431] HARDIRQ-ON-W at:
[ 75.937431] [<c106a8de>] mark_irqflags+0xfe/0x180
[ 75.937431] [<c106b65d>] __lock_acquire+0x38d/0x8e0
[ 75.937431] [<c106cbfa>] lock_acquire+0x7a/0xa0
[ 75.937431] [<c138c4ae>] _raw_write_lock_bh+0x3e/0x80
[ 75.937431] [<c135eac3>] xs_tcp_finish_connecting+0x73/0x120
[ 75.937431] [<c135ebcb>] xs_tcp_setup_socket+0x5b/0x180
[ 75.937431] [<c135ee04>] xs_tcp_connect_worker4+0x14/0x20
[ 75.937431] [<c1051547>] process_one_work+0x147/0x3a0
[ 75.937431] [<c1051886>] worker_thread+0xa6/0x200
[ 75.937431] [<c1056765>] kthread+0x75/0x80
[ 75.937431] [<c10031fa>] kernel_thread_helper+0x6/0x1c
[ 75.937431] HARDIRQ-ON-R at:
[ 75.937431] [<c106a84e>] mark_irqflags+0x6e/0x180
[ 75.937431] [<c106b65d>] __lock_acquire+0x38d/0x8e0
[ 75.937431] [<c106cbfa>] lock_acquire+0x7a/0xa0
[ 75.937431] [<c138c019>] _raw_read_lock+0x39/0x70
[ 75.937431] [<c135ddee>] xs_tcp_state_change+0x1e/0x1d0
[ 75.937431] [<c131bd78>] tcp_rcv_synsent_state_process+0x398/0x590
[ 75.937431] [<c131c417>] tcp_rcv_state_process+0x4a7/0x560
[ 75.937431] [<c1322ea1>] tcp_v4_do_rcv+0x71/0x280
[ 75.937431] [<c12da226>] __release_sock+0x66/0x150
[ 75.937431] [<c12daf47>] release_sock+0x87/0x90
[ 75.937431] [<c1331eaa>] inet_stream_connect+0x5a/0x1b0
[ 75.937431] [<c12d7d68>] kernel_connect+0x18/0x30
[ 75.937431] [<c135ea9e>] xs_tcp_finish_connecting+0x4e/0x120
[ 75.937431] [<c135ebcb>] xs_tcp_setup_socket+0x5b/0x180
[ 75.937431] [<c135ee04>] xs_tcp_connect_worker4+0x14/0x20
[ 75.937431] [<c1051547>] process_one_work+0x147/0x3a0
[ 75.937431] [<c1051886>] worker_thread+0xa6/0x200
[ 75.937431] [<c1056765>] kthread+0x75/0x80
[ 75.937431] [<c10031fa>] kernel_thread_helper+0x6/0x1c
[ 75.937431] IN-SOFTIRQ-R at:
[ 75.937431] [<c106a8fe>] mark_irqflags+0x11e/0x180
[ 75.937431] [<c106b65d>] __lock_acquire+0x38d/0x8e0
[ 75.937431] [<c106cbfa>] lock_acquire+0x7a/0xa0
[ 75.937431] [<c138c019>] _raw_read_lock+0x39/0x70
[ 75.937431] [<c135dcc1>] xs_tcp_data_ready+0x21/0x90
[ 75.937431] [<c131a238>] tcp_data_queue+0x248/0x820
[ 75.937431] [<c131b5ae>] tcp_rcv_established+0xae/0x4e0
[ 75.937431] [<c1323001>] tcp_v4_do_rcv+0x1d1/0x280
[ 75.937431] [<c1323624>] tcp_v4_rcv+0x574/0xa30
[ 75.937431] [<c1305483>] ip_local_deliver_finish+0x103/0x320
[ 75.937431] [<c13056d0>] ip_local_deliver+0x30/0x40
[ 75.937431] [<c1305849>] ip_rcv_finish+0x169/0x480
[ 75.937431] [<c1305cfa>] ip_rcv+0x19a/0x2b0
[ 75.937431] [<c12e695d>] __netif_receive_skb+0x21d/0x310
[ 75.937431] [<c12e7468>] process_backlog+0x88/0x160
[ 75.937431] [<c12e7837>] net_rx_action+0x127/0x140
[ 75.937431] [<c1042e70>] __do_softirq+0xd0/0x130
[ 75.937431] SOFTIRQ-ON-R at:
[ 75.937431] [<c106a8c2>] mark_irqflags+0xe2/0x180
[ 75.937431] [<c106b65d>] __lock_acquire+0x38d/0x8e0
[ 75.937431] [<c106cbfa>] lock_acquire+0x7a/0xa0
[ 75.937431] [<c138c019>] _raw_read_lock+0x39/0x70
[ 75.937431] [<c135ddee>] xs_tcp_state_change+0x1e/0x1d0
[ 75.937431] [<c1332597>] inet_shutdown+0x97/0x110
[ 75.937431] [<c12d7f69>] kernel_sock_shutdown+0x9/0x10
[ 75.937431] [<c135d0e7>] xs_tcp_shutdown+0x17/0x20
[ 75.937431] [<c135d3e7>] xs_tcp_close+0x27/0x30
[ 75.937431] [<c135b63d>] xprt_autoclose+0x1d/0x50
[ 75.937431] [<c1051547>] process_one_work+0x147/0x3a0
[ 75.937431] [<c1051886>] worker_thread+0xa6/0x200
[ 75.937431] [<c1056765>] kthread+0x75/0x80
[ 75.937431] [<c10031fa>] kernel_thread_helper+0x6/0x1c
[ 75.937431] INITIAL USE at:
[ 75.937431] [<c106b490>] __lock_acquire+0x1c0/0x8e0
[ 75.937431] [<c106cbfa>] lock_acquire+0x7a/0xa0
[ 75.937431] [<c138c4ae>] _raw_write_lock_bh+0x3e/0x80
[ 75.937431] [<c135eac3>] xs_tcp_finish_connecting+0x73/0x120
[ 75.937431] [<c135ebcb>] xs_tcp_setup_socket+0x5b/0x180
[ 75.937431] [<c135ee04>] xs_tcp_connect_worker4+0x14/0x20
[ 75.937431] [<c1051547>] process_one_work+0x147/0x3a0
[ 75.937431] [<c1051886>] worker_thread+0xa6/0x200
[ 75.937431] [<c1056765>] kthread+0x75/0x80
[ 75.937431] [<c10031fa>] kernel_thread_helper+0x6/0x1c
[ 75.937431] }
[ 75.937431] ... key at: [<c1d4cb10>] af_callback_keys+0x10/0x130
[ 75.937431] ... acquired at:
[ 75.937431] [<c1069d46>] check_usage_backwards+0x76/0xd0
[ 75.937431] [<c1069f59>] mark_lock_irq+0x99/0x240
[ 75.937431] [<c106abfc>] mark_lock+0x21c/0x3c0
[ 75.937431] [<c106a8c2>] mark_irqflags+0xe2/0x180
[ 75.937431] [<c106b65d>] __lock_acquire+0x38d/0x8e0
[ 75.937431] [<c106cbfa>] lock_acquire+0x7a/0xa0
[ 75.937431] [<c138c019>] _raw_read_lock+0x39/0x70
[ 75.937431] [<c135ddee>] xs_tcp_state_change+0x1e/0x1d0
[ 75.937431] [<c1332597>] inet_shutdown+0x97/0x110
[ 75.937431] [<c12d7f69>] kernel_sock_shutdown+0x9/0x10
[ 75.937431] [<c135d0e7>] xs_tcp_shutdown+0x17/0x20
[ 75.937431] [<c135d3e7>] xs_tcp_close+0x27/0x30
[ 75.937431] [<c135b63d>] xprt_autoclose+0x1d/0x50
[ 75.937431] [<c1051547>] process_one_work+0x147/0x3a0
[ 75.937431] [<c1051886>] worker_thread+0xa6/0x200
[ 75.937431] [<c1056765>] kthread+0x75/0x80
[ 75.937431] [<c10031fa>] kernel_thread_helper+0x6/0x1c
[ 75.937431]
[ 75.937431]
[ 75.937431] stack backtrace:
[ 75.937431] Pid: 418, comm: kworker/1:1 Not tainted 2.6.36-rc5 #2
[ 75.937431] Call Trace:
[ 75.937431] [<c103deb8>] ? printk+0x18/0x20
[ 75.937431] [<c1069bd8>] print_irq_inversion_bug+0x108/0x120
[ 75.937431] [<c1069d46>] check_usage_backwards+0x76/0xd0
[ 75.937431] [<c1069f59>] mark_lock_irq+0x99/0x240
[ 75.937431] [<c1069cd0>] ? check_usage_backwards+0x0/0xd0
[ 75.937431] [<c106abfc>] mark_lock+0x21c/0x3c0
[ 75.937431] [<c106a8c2>] mark_irqflags+0xe2/0x180
[ 75.937431] [<c106b65d>] __lock_acquire+0x38d/0x8e0
[ 75.937431] [<c106c95a>] ? __lock_is_held+0x3a/0x60
[ 75.937431] [<c106cbfa>] lock_acquire+0x7a/0xa0
[ 75.937431] [<c135ddee>] ? xs_tcp_state_change+0x1e/0x1d0
[ 75.937431] [<c138c019>] _raw_read_lock+0x39/0x70
[ 75.937431] [<c135ddee>] ? xs_tcp_state_change+0x1e/0x1d0
[ 75.937431] [<c135ddee>] xs_tcp_state_change+0x1e/0x1d0
[ 75.937431] [<c131f2af>] ? tcp_send_fin+0x4f/0xc0
[ 75.937431] [<c1332597>] inet_shutdown+0x97/0x110
[ 75.937431] [<c12d7f69>] kernel_sock_shutdown+0x9/0x10
[ 75.937431] [<c135d0e7>] xs_tcp_shutdown+0x17/0x20
[ 75.937431] [<c135d3e7>] xs_tcp_close+0x27/0x30
[ 75.937431] [<c135b63d>] xprt_autoclose+0x1d/0x50
[ 75.937431] [<c1051547>] process_one_work+0x147/0x3a0
[ 75.937431] [<c10514d6>] ? process_one_work+0xd6/0x3a0
[ 75.937431] [<c106d179>] ? __lock_acquired+0x119/0x1c0
[ 75.937431] [<c135b620>] ? xprt_autoclose+0x0/0x50
[ 75.937431] [<c10517fc>] ? worker_thread+0x1c/0x200
[ 75.937431] [<c1050317>] ? __need_more_worker+0x17/0x40
[ 75.937431] [<c1051886>] worker_thread+0xa6/0x200
[ 75.937431] [<c1056765>] kthread+0x75/0x80
[ 75.937431] [<c10517e0>] ? worker_thread+0x0/0x200
[ 75.937431] [<c10566f0>] ? kthread+0x0/0x80
[ 75.937431] [<c10031fa>] kernel_thread_helper+0x6/0x1c
[ 83.749463] Restarting system.
[ 83.751581] machine restart
FYI,
# cat /etc/exports
/usr/src/ *(rw,no_root_squash,async)
# grep nfs /proc/mounts
127.0.0.1:/usr/src/ /mnt nfs rw,relatime,vers=3,rsize=32768,wsize=32768,namlen=255,hard,proto=udp,port=65535,timeo=7,retrans=3,sec=sys,addr=127.0.0.1 0 0
test.sh does not trigger this warning on 2.6.34.7 and
triggers this warning on 2.6.35.5 .
Regards.
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