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Date: Thu, 30 Dec 2010 09:57:54 -0800
From: Linus Torvalds <torvalds@...ux-foundation.org>
To: Uwe Kleine-König
<u.kleine-koenig@...gutronix.de>,
Trond Myklebust <Trond.Myklebust@...app.com>,
Chuck Lever <chuck.lever@...cle.com>
Cc: linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
Arnd Bergmann <arnd@...db.de>
Subject: Re: still nfs problems [Was: Linux 2.6.37-rc8]
Please cc the poor hapless NFS people too, who probably otherwise
wouldn't see it. And Arnd just in case it might be locking-related.
Trond, any ideas? The sysrq thing does imply that it's stuck in some
busy-loop in fs/nfs/dir.c, and line 647 is get_cache_page(), which in
turn implies that the endless loop is either the loop in
readdir_search_pagecache() _or_ in a caller. In particular, the
EBADCOOKIE case in the caller (nfs_readdir) looks suspicious. What
protects us from endless streams of EBADCOOKIE and a successful
uncached_readdir?
Linus
2010/12/30 Uwe Kleine-König <u.kleine-koenig@...gutronix.de>:
> Hello,
>
> I wonder if the nfs-stuff is considered to be solved, because I still
> see strange things.
>
> During boot my machine sometimes (approx one out of two times) hangs with
> the output pasted below on Sysctl-l. The irq
>
> I'm not 100% sure it's related, but at least it seems to hang in
> nfs_readdir. (When the serial irq happend that triggered the sysrq the
> program counter was at 0xc014601c, which is fs/nfs/dir.c:647 for me.)
>
> This is on 2.6.37-rc8 plus some patches for machine support on an ARM
> machine.
>
> Best regards
> Uwe
>
> [ 2700.100000] SysRq : Show State
> [ 2700.100000] task PC stack pid father
> [ 2700.100000] init S c0285d80 0 1 0 0x00000000
> [ 2700.100000] Backtrace:
> [ 2700.100000] [<c02858c8>] (schedule+0x0/0x534) from [<c004f268>] (do_wait+0x1a4/0x20c)
> [ 2700.100000] [<c004f0c4>] (do_wait+0x0/0x20c) from [<c004f378>] (sys_wait4+0xa8/0xc0)
> [ 2700.100000] [<c004f2d0>] (sys_wait4+0x0/0xc0) from [<c0033e80>] (ret_fast_syscall+0x0/0x38)
> [ 2700.100000] r8:c0034088 r7:00000072 r6:00000001 r5:0000001b r4:0140b228
> [ 2700.100000] kthreadd S c0285d80 0 2 0 0x00000000
> [ 2700.100000] Backtrace:
> [ 2700.100000] [<c02858c8>] (schedule+0x0/0x534) from [<c006a30c>] (kthreadd+0x70/0xfc)
> [ 2700.100000] [<c006a29c>] (kthreadd+0x0/0xfc) from [<c004f4d8>] (do_exit+0x0/0x658)
> [ 2700.100000] ksoftirqd/0 S c0285d80 0 3 2 0x00000000
> [ 2700.100000] Backtrace:
> [ 2700.100000] [<c02858c8>] (schedule+0x0/0x534) from [<c0052714>] (run_ksoftirqd+0x5c/0x110)
> [ 2700.100000] [<c00526b8>] (run_ksoftirqd+0x0/0x110) from [<c006a294>] (kthread+0x8c/0x94)
> [ 2700.100000] r8:00000000 r7:c00526b8 r6:00000000 r5:c7843f1c r4:c7859fac
> [ 2700.100000] [<c006a208>] (kthread+0x0/0x94) from [<c004f4d8>] (do_exit+0x0/0x658)
> [ 2700.100000] r7:00000013 r6:c004f4d8 r5:c006a208 r4:c7843f1c
> [ 2700.100000] kworker/0:0 S c0285d80 0 4 2 0x00000000
> [ 2700.100000] Backtrace:
> [ 2700.100000] [<c02858c8>] (schedule+0x0/0x534) from [<c006480c>] (worker_thread+0x41c/0x444)
> [ 2700.100000] [<c00643f0>] (worker_thread+0x0/0x444) from [<c006a294>] (kthread+0x8c/0x94)
> [ 2700.100000] [<c006a208>] (kthread+0x0/0x94) from [<c004f4d8>] (do_exit+0x0/0x658)
> [ 2700.100000] r7:00000013 r6:c004f4d8 r5:c006a208 r4:c7843edc
> [ 2700.100000] kworker/u:0 S c0285d80 0 5 2 0x00000000
> [ 2700.100000] Backtrace:
> [ 2700.100000] [<c02858c8>] (schedule+0x0/0x534) from [<c006480c>] (worker_thread+0x41c/0x444)
> [ 2700.100000] [<c00643f0>] (worker_thread+0x0/0x444) from [<c006a294>] (kthread+0x8c/0x94)
> [ 2700.100000] [<c006a208>] (kthread+0x0/0x94) from [<c004f4d8>] (do_exit+0x0/0x658)
> [ 2700.100000] r7:00000013 r6:c004f4d8 r5:c006a208 r4:c7843edc
> [ 2700.100000] watchdog/0 S c0285d80 0 6 2 0x00000000
> [ 2700.100000] Backtrace:
> [ 2700.100000] [<c02858c8>] (schedule+0x0/0x534) from [<c008b418>] (watchdog+0xc0/0x110)
> [ 2700.100000] [<c008b358>] (watchdog+0x0/0x110) from [<c006a294>] (kthread+0x8c/0x94)
> [ 2700.100000] r6:00000000 r5:c7843efc r4:c785ffac
> [ 2700.100000] [<c006a208>] (kthread+0x0/0x94) from [<c004f4d8>] (do_exit+0x0/0x658)
> [ 2700.100000] r7:00000013 r6:c004f4d8 r5:c006a208 r4:c7843efc
> [ 2700.100000] khelper S c0285d80 0 7 2 0x00000000
> [ 2700.100000] Backtrace:
> [ 2700.100000] [<c02858c8>] (schedule+0x0/0x534) from [<c00657d4>] (rescuer_thread+0x1b8/0x1c4)
> [ 2700.100000] [<c006561c>] (rescuer_thread+0x0/0x1c4) from [<c006a294>] (kthread+0x8c/0x94)
> [ 2700.100000] [<c006a208>] (kthread+0x0/0x94) from [<c004f4d8>] (do_exit+0x0/0x658)
> [ 2700.100000] r7:00000013 r6:c004f4d8 r5:c006a208 r4:c7843f1c
> [ 2700.100000] sync_supers S c0285d80 0 8 2 0x00000000
> [ 2700.100000] Backtrace:
> [ 2700.100000] [<c02858c8>] (schedule+0x0/0x534) from [<c00cd114>] (bdi_sync_supers+0x38/0x50)
> [ 2700.100000] [<c00cd0dc>] (bdi_sync_supers+0x0/0x50) from [<c006a294>] (kthread+0x8c/0x94)
> [ 2700.100000] r5:c7843f2c r4:c7895fac
> [ 2700.100000] [<c006a208>] (kthread+0x0/0x94) from [<c004f4d8>] (do_exit+0x0/0x658)
> [ 2700.100000] r7:00000013 r6:c004f4d8 r5:c006a208 r4:c7843f2c
> [ 2700.100000] bdi-default S c0285d80 0 9 2 0x00000000
> [ 2700.100000] Backtrace:
> [ 2700.100000] [<c02858c8>] (schedule+0x0/0x534) from [<c02864b4>] (schedule_timeout+0x22c/0x27c)
> [ 2700.100000] [<c0286288>] (schedule_timeout+0x0/0x27c) from [<c00ce014>] (bdi_forker_thread+0x3a8/0x41c)
> [ 2700.100000] r8:c0363f80 r7:00000000 r6:00000000 r5:c03641e8 r4:00000000
> [ 2700.100000] [<c00cdc6c>] (bdi_forker_thread+0x0/0x41c) from [<c006a294>] (kthread+0x8c/0x94)
> [ 2700.100000] [<c006a208>] (kthread+0x0/0x94) from [<c004f4d8>] (do_exit+0x0/0x658)
> [ 2700.100000] r7:00000013 r6:c004f4d8 r5:c006a208 r4:c7843efc
> [ 2700.100000] kintegrityd S c0285d80 0 10 2 0x00000000
> [ 2700.100000] Backtrace:
> [ 2700.100000] [<c02858c8>] (schedule+0x0/0x534) from [<c00657d4>] (rescuer_thread+0x1b8/0x1c4)
> [ 2700.100000] [<c006561c>] (rescuer_thread+0x0/0x1c4) from [<c006a294>] (kthread+0x8c/0x94)
> [ 2700.100000] [<c006a208>] (kthread+0x0/0x94) from [<c004f4d8>] (do_exit+0x0/0x658)
> [ 2700.100000] r7:00000013 r6:c004f4d8 r5:c006a208 r4:c7843e9c
> [ 2700.100000] kblockd S c0285d80 0 11 2 0x00000000
> [ 2700.100000] Backtrace:
> [ 2700.100000] [<c02858c8>] (schedule+0x0/0x534) from [<c00657d4>] (rescuer_thread+0x1b8/0x1c4)
> [ 2700.100000] [<c006561c>] (rescuer_thread+0x0/0x1c4) from [<c006a294>] (kthread+0x8c/0x94)
> [ 2700.100000] [<c006a208>] (kthread+0x0/0x94) from [<c004f4d8>] (do_exit+0x0/0x658)
> [ 2700.100000] r7:00000013 r6:c004f4d8 r5:c006a208 r4:c7843ec4
> [ 2700.100000] rpciod S c0285d80 0 12 2 0x00000000
> [ 2700.100000] Backtrace:
> [ 2700.100000] [<c02858c8>] (schedule+0x0/0x534) from [<c00657d4>] (rescuer_thread+0x1b8/0x1c4)
> [ 2700.100000] [<c006561c>] (rescuer_thread+0x0/0x1c4) from [<c006a294>] (kthread+0x8c/0x94)
> [ 2700.100000] [<c006a208>] (kthread+0x0/0x94) from [<c004f4d8>] (do_exit+0x0/0x658)
> [ 2700.100000] r7:00000013 r6:c004f4d8 r5:c006a208 r4:c7843ebc
> [ 2700.100000] kworker/0:1 S c0285d80 0 13 2 0x00000000
> [ 2700.100000] Backtrace:
> [ 2700.100000] [<c02858c8>] (schedule+0x0/0x534) from [<c006480c>] (worker_thread+0x41c/0x444)
> [ 2700.100000] [<c00643f0>] (worker_thread+0x0/0x444) from [<c006a294>] (kthread+0x8c/0x94)
> [ 2700.100000] [<c006a208>] (kthread+0x0/0x94) from [<c004f4d8>] (do_exit+0x0/0x658)
> [ 2700.100000] r7:00000013 r6:c004f4d8 r5:c006a208 r4:c785be94
> [ 2700.100000] khungtaskd S c0285d80 0 14 2 0x00000000
> [ 2700.100000] Backtrace:
> [ 2700.100000] [<c02858c8>] (schedule+0x0/0x534) from [<c02864b4>] (schedule_timeout+0x22c/0x27c)
> [ 2700.100000] [<c0286288>] (schedule_timeout+0x0/0x27c) from [<c0286584>] (schedule_timeout_interruptible+0x28/0x2c)
> [ 2700.100000] r8:00000078 r7:00007fe9 r6:000003e9 r5:c034eef0 r4:00000064
> [ 2700.100000] [<c028655c>] (schedule_timeout_interruptible+0x0/0x2c) from [<c008ada8>] (watchdog+0x54/0x2e8)
> [ 2700.100000] [<c008ad54>] (watchdog+0x0/0x2e8) from [<c006a294>] (kthread+0x8c/0x94)
> [ 2700.100000] [<c006a208>] (kthread+0x0/0x94) from [<c004f4d8>] (do_exit+0x0/0x658)
> [ 2700.100000] r7:00000013 r6:c004f4d8 r5:c006a208 r4:c7843f2c
> [ 2700.100000] kswapd0 S c0285d80 0 15 2 0x00000000
> [ 2700.100000] Backtrace:
> [ 2700.100000] [<c02858c8>] (schedule+0x0/0x534) from [<c00c5ea4>] (kswapd+0x210/0x74c)
> [ 2700.100000] [<c00c5c94>] (kswapd+0x0/0x74c) from [<c006a294>] (kthread+0x8c/0x94)
> [ 2700.100000] [<c006a208>] (kthread+0x0/0x94) from [<c004f4d8>] (do_exit+0x0/0x658)
> [ 2700.100000] r7:00000013 r6:c004f4d8 r5:c006a208 r4:c7843f1c
> [ 2700.100000] fsnotify_mark S c0285d80 0 16 2 0x00000000
> [ 2700.100000] Backtrace:
> [ 2700.100000] [<c02858c8>] (schedule+0x0/0x534) from [<c011f884>] (fsnotify_mark_destroy+0x11c/0x144)
> [ 2700.100000] [<c011f768>] (fsnotify_mark_destroy+0x0/0x144) from [<c006a294>] (kthread+0x8c/0x94)
> [ 2700.100000] [<c006a208>] (kthread+0x0/0x94) from [<c004f4d8>] (do_exit+0x0/0x658)
> [ 2700.100000] r7:00000013 r6:c004f4d8 r5:c006a208 r4:c7843f34
> [ 2700.100000] aio S c0285d80 0 17 2 0x00000000
> [ 2700.100000] Backtrace:
> [ 2700.100000] [<c02858c8>] (schedule+0x0/0x534) from [<c00657d4>] (rescuer_thread+0x1b8/0x1c4)
> [ 2700.100000] [<c006561c>] (rescuer_thread+0x0/0x1c4) from [<c006a294>] (kthread+0x8c/0x94)
> [ 2700.100000] [<c006a208>] (kthread+0x0/0x94) from [<c004f4d8>] (do_exit+0x0/0x658)
> [ 2700.100000] r7:00000013 r6:c004f4d8 r5:c006a208 r4:c7843edc
> [ 2700.100000] nfsiod S c0285d80 0 18 2 0x00000000
> [ 2700.100000] Backtrace:
> [ 2700.100000] [<c02858c8>] (schedule+0x0/0x534) from [<c00657d4>] (rescuer_thread+0x1b8/0x1c4)
> [ 2700.100000] [<c006561c>] (rescuer_thread+0x0/0x1c4) from [<c006a294>] (kthread+0x8c/0x94)
> [ 2700.100000] [<c006a208>] (kthread+0x0/0x94) from [<c004f4d8>] (do_exit+0x0/0x658)
> [ 2700.100000] r7:00000013 r6:c004f4d8 r5:c006a208 r4:c7843edc
> [ 2700.100000] crypto S c0285d80 0 19 2 0x00000000
> [ 2700.100000] Backtrace:
> [ 2700.100000] [<c02858c8>] (schedule+0x0/0x534) from [<c00657d4>] (rescuer_thread+0x1b8/0x1c4)
> [ 2700.100000] [<c006561c>] (rescuer_thread+0x0/0x1c4) from [<c006a294>] (kthread+0x8c/0x94)
> [ 2700.100000] [<c006a208>] (kthread+0x0/0x94) from [<c004f4d8>] (do_exit+0x0/0x658)
> [ 2700.100000] r7:00000013 r6:c004f4d8 r5:c006a208 r4:c7843ee4
> [ 2700.100000] kworker/u:1 S c0285d80 0 24 2 0x00000000
> [ 2700.100000] Backtrace:
> [ 2700.100000] [<c02858c8>] (schedule+0x0/0x534) from [<c006480c>] (worker_thread+0x41c/0x444)
> [ 2700.100000] [<c00643f0>] (worker_thread+0x0/0x444) from [<c006a294>] (kthread+0x8c/0x94)
> [ 2700.100000] [<c006a208>] (kthread+0x0/0x94) from [<c004f4d8>] (do_exit+0x0/0x658)
> [ 2700.100000] r7:00000013 r6:c004f4d8 r5:c006a208 r4:c785de94
> [ 2700.100000] rcS S c0285d80 0 27 1 0x00000000
> [ 2700.100000] Backtrace:
> [ 2700.100000] [<c02858c8>] (schedule+0x0/0x534) from [<c004f268>] (do_wait+0x1a4/0x20c)
> [ 2700.100000] [<c004f0c4>] (do_wait+0x0/0x20c) from [<c004f378>] (sys_wait4+0xa8/0xc0)
> [ 2700.100000] [<c004f2d0>] (sys_wait4+0x0/0xc0) from [<c0033e80>] (ret_fast_syscall+0x0/0x38)
> [ 2700.100000] r8:c0034088 r7:00000072 r6:ffffffff r5:bee7880c r4:00000000
> [ 2700.100000] run-parts S c0285d80 0 35 27 0x00000000
> [ 2700.100000] Backtrace:
> [ 2700.100000] [<c02858c8>] (schedule+0x0/0x534) from [<c004f268>] (do_wait+0x1a4/0x20c)
> [ 2700.100000] [<c004f0c4>] (do_wait+0x0/0x20c) from [<c004f378>] (sys_wait4+0xa8/0xc0)
> [ 2700.100000] [<c004f2d0>] (sys_wait4+0x0/0xc0) from [<c0033e80>] (ret_fast_syscall+0x0/0x38)
> [ 2700.100000] r8:c0034088 r7:00000072 r6:00000024 r5:bef7dcc4 r4:00000000
> [ 2700.100000] S00splashutil R running 0 36 35 0x00000000
> [ 2700.100000] Backtrace:
> [ 2700.100000] [<c0037b54>] (dump_backtrace+0x0/0x110) from [<c0037c80>] (show_stack+0x1c/0x20)
> [ 2700.100000] r7:c79cfd64 r6:00000000 r5:c7954600 r4:00000000
> [ 2700.100000] [<c0037c64>] (show_stack+0x0/0x20) from [<c0046b78>] (sched_show_task+0xb0/0xcc)
> [ 2700.100000] [<c0046ac8>] (sched_show_task+0x0/0xcc) from [<c0046bf0>] (show_state_filter+0x5c/0xc8)
> [ 2700.100000] r5:c7954600 r4:c7954600
> [ 2700.100000] [<c0046b94>] (show_state_filter+0x0/0xc8) from [<c01c5c40>] (sysrq_handle_showstate+0x18/0x1c)
> [ 2700.100000] r8:20000093 r7:00000007 r6:00000001 r5:00000074 r4:c036ec5c
> [ 2700.100000] [<c01c5c28>] (sysrq_handle_showstate+0x0/0x1c) from [<c01c6040>] (__handle_sysrq+0xe0/0x190)
> [ 2700.100000] [<c01c5f60>] (__handle_sysrq+0x0/0x190) from [<c01c62d8>] (handle_sysrq+0x38/0x44)
> [ 2700.100000] r8:c7999000 r7:00000100 r6:c7973640 r5:00010074 r4:c7864300
> [ 2700.100000] [<c01c62a0>] (handle_sysrq+0x0/0x44) from [<c01da100>] (pl011_int+0x18c/0x5a4)
> [ 2700.100000] [<c01d9f74>] (pl011_int+0x0/0x5a4) from [<c008b8b0>] (handle_IRQ_event+0x7c/0x1a8)
> [ 2700.100000] [<c008b834>] (handle_IRQ_event+0x0/0x1a8) from [<c008de5c>] (handle_level_irq+0xc8/0x148)
> [ 2700.100000] [<c008dd94>] (handle_level_irq+0x0/0x148) from [<c002d080>] (asm_do_IRQ+0x80/0xa4)
> [ 2700.100000] r7:c74a05a4 r6:c74a0508 r5:00000000 r4:0000002f
> [ 2700.100000] [<c002d000>] (asm_do_IRQ+0x0/0xa4) from [<c0033ab8>] (__irq_svc+0x38/0x80)
> [ 2700.100000] Exception stack(0xc79cfe88 to 0xc79cfed0)
> [ 2700.100000] fe80: c74a0508 00000000 c0145d24 c7487e60 00000000 c79cfee8
> [ 2700.100000] fea0: c74a0508 c74a05a4 c7487e60 c79cfee8 c74a0508 c79cff4c c79ce000 c79cfed0
> [ 2700.100000] fec0: c016ff10 c014601c 60000013 ffffffff
> [ 2700.100000] r5:f5000000 r4:ffffffff
> [ 2700.100000] [<c0145f0c>] (nfs_readdir+0x0/0x458) from [<c00fa298>] (vfs_readdir+0x7c/0xb0)
> [ 2700.100000] [<c00fa21c>] (vfs_readdir+0x0/0xb0) from [<c00fa3fc>] (sys_getdents+0x70/0xb8)
> [ 2700.100000] [<c00fa38c>] (sys_getdents+0x0/0xb8) from [<c0033e80>] (ret_fast_syscall+0x0/0x38)
> [ 2700.100000] r7:0000008d r6:00000000 r5:402ed00c r4:402ed020
> [ 2700.100000] Sched Debug Version: v0.09, 2.6.37-rc8-00065-g1cd48e3-dirty #35
> [ 2700.100000] now at 2701202.749966 msecs
> [ 2700.100000] .jiffies : 240010
> [ 2700.100000] .sysctl_sched_latency : 6.000000
> [ 2700.100000] .sysctl_sched_min_granularity : 0.750000
> [ 2700.100000] .sysctl_sched_wakeup_granularity : 1.000000
> [ 2700.100000] .sysctl_sched_child_runs_first : 0
> [ 2700.100000] .sysctl_sched_features : 31855
> [ 2700.100000] .sysctl_sched_tunable_scaling : 1 (logaritmic)
> [ 2700.100000]
> [ 2700.100000] cpu#0
> [ 2700.100000] .nr_running : 1
> [ 2700.100000] .load : 1024
> [ 2700.100000] .nr_switches : 11875
> [ 2700.100000] .nr_load_updates : 269696
> [ 2700.100000] .nr_uninterruptible : 0
> [ 2700.100000] .next_balance : 0.000000
> [ 2700.100000] .curr->pid : 36
> [ 2700.100000] .clock : 2700100.000000
> [ 2700.100000] .cpu_load[0] : 1024
> [ 2700.100000] .cpu_load[1] : 1024
> [ 2700.100000] .cpu_load[2] : 1024
> [ 2700.100000] .cpu_load[3] : 1024
> [ 2700.100000] .cpu_load[4] : 1024
> [ 2700.100000]
> [ 2700.100000] cfs_rq[0]:
> [ 2700.100000] .exec_clock : 0.000000
> [ 2700.100000] .MIN_vruntime : 0.000001
> [ 2700.100000] .min_vruntime : 2695651.938408
> [ 2700.100000] .max_vruntime : 0.000001
> [ 2700.100000] .spread : 0.000000
> [ 2700.100000] .spread0 : 0.000000
> [ 2700.100000] .nr_running : 1
> [ 2700.100000] .load : 1024
> [ 2700.100000] .nr_spread_over : 0
> [ 2700.100000]
> [ 2700.100000] rt_rq[0]:
> [ 2700.100000] .rt_nr_running : 0
> [ 2700.100000] .rt_throttled : 0
> [ 2700.100000] .rt_time : 0.000000
> [ 2700.100000] .rt_runtime : 950.000000
> [ 2700.100000]
> [ 2700.100000] runnable tasks:
> [ 2700.100000] task PID tree-key switches prio exec-runtime sum-exec sum-sleep
> [ 2700.100000] ----------------------------------------------------------------------------------------------------------
> [ 2700.100000] R S00splashutils 36 2695651.938408 5397 120 0 0 0.000000 0.000000 0.000000
> [ 2700.100000]
> [ 2700.100000]
> [ 2700.100000] Showing all locks held in the system:
> [ 2700.100000] 4 locks held by S00splashutils/36:
> [ 2700.100000] #0: (&sb->s_type->i_mutex_key#8){+.+.+.}, at: [<c00fa268>] vfs_readdir+0x4c/0xb0
> [ 2700.100000] #1: (&port_lock_key){-.-...}, at: [<c01d9f94>] pl011_int+0x20/0x5a4
> [ 2700.100000] #2: (sysrq_key_table_lock){-.....}, at: [<c01c5f84>] __handle_sysrq+0x24/0x190
> [ 2700.100000] #3: (tasklist_lock){.?.+..}, at: [<c007c404>] debug_show_all_locks+0x40/0x1a4
> [ 2700.100000]
> [ 2700.100000] =============================================
> [ 2700.100000]
>
>
> --
> Pengutronix e.K. | Uwe Kleine-König |
> Industrial Linux Solutions | http://www.pengutronix.de/ |
>
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