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Date: Fri, 11 Sep 2015 13:24:56 +0200
From: Linus Walleij <linus.walleij@...aro.org>
To: "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
Josh Triplett <josh@...htriplett.org>
Cc: "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RCU explosion on ARM Integrator
Hi RCU folks,
this happened to me when running the iozone throughput benchmark
on the ARM Integrator, I wonder if I should take this platform for a ride on
the RCU torture test or similar? Looks a bit instable :/
Yours,
Linus Walleij
root@...egrator:/ iozone -az -i0 -i1 -i2 -s 20m -I -f /mnt/foo.test
Iozone: Performance Test of File I/O
Version $Revision: 3.430 $
Compiled for 32 bit mode.
Build: linux-arm
Contributors:William Norcott, Don Capps, Isom Crawford, Kirby Collins
Al Slater, Scott Rhine, Mike Wisner, Ken Goss
Steve Landherr, Brad Smith, Mark Kelly, Dr. Alain CYR,
Randy Dunlap, Mark Montague, Dan Million, Gavin Brebner,
Jean-Marc Zucconi, Jeff Blomberg, Benny Halevy, Dave Boone,
Erik Habbinga, Kris Strecker, Walter Wong, Joshua Root,
Fabrice Bacchella, Zhenghua Xue, Qin Li, Darren Sawyer,
Vangel Bojaxhi, Ben England, Vikentsi Lapa.
Run began: Thu Jan 1 01:16:39 1970
Auto Mode
Cross over of record size disabled.
File size set to 20480 kB
O_DIRECT feature enabled
Command line used: iozone -az -i0 -i1 -i2 -s 20m -I -f /mnt/foo.test
Output is in kBytes/sec
Time Resolution = 0.000016 seconds.
Processor cache size set to 1024 kBytes.
Processor cache line size set to 32 bytes.
File stride size set to 17 * record size.
random
random bkwd record stride
kB reclen write rewrite read reread read
write read rewrite read fwrite frewrite fread
freread
20480 4 54 56 57 57 57
24
20480 8 56 57 58 58 58
34
20480 16 56 58 59 59Unable to
handle kernel paging request at virtual address 807b7cac
pgd = c6404000
[807b7cac] *pgd=00000000
Internal error: Oops: 5 [#1] PREEMPT ARM
Modules linked in:
CPU: 0 PID: 110 Comm: iozone Not tainted 4.2.0-11142-gb0a1ea51bda4-dirty #3
Hardware name: ARM Integrator/AP (Device Tree)
task: c6b45540 ti: c6420000 task.ti: c6420000
PC is at rcu_check_callbacks+0x318/0x850
LR is at rcu_check_callbacks+0x310/0x850
pc : [<c00546a8>] lr : [<c00546a0>] psr: 60000093
sp : c64218c0 ip : c07b8038 fp : c07b8920
r10: 807b7ca8 r9 : 00000001 r8 : c07b79f8
r7 : c07b2110 r6 : c07b2118 r5 : c07b7ca8 r4 : c07b8004
r3 : c07b8038 r2 : c07b8038 r1 : c07b8004 r0 : 00000000
Flags: nZCv IRQs off FIQs on Mode SVC_32 ISA ARM Segment none
Control: 0005317f Table: 06404000 DAC: 00000051
Process iozone (pid: 110, stack limit = 0xc6420190)
Stack: (0xc64218c0 to 0xc6422000)
18c0: ???????? ???????? ???????? ???????? ???????? ???????? ???????? ????????
18e0: ???????? ???????? ???????? ???????? ???????? ???????? ???????? ????????
1900: ???????? ???????? ???????? ???????? ???????? ???????? ???????? ????????
1920: ???????? ???????? ???????? ???????? ???????? ???????? ???????? ????????
1940: ???????? ???????? ???????? ???????? ???????? ???????? ???????? ????????
1960: ???????? ???????? ???????? ???????? ???????? ???????? ???????? ????????
1980: ???????? ???????? ???????? ???????? ???????? ???????? ???????? ????????
19a0: ???????? ???????? ???????? ???????? ???????? ???????? ???????? ????????
19c0: ???????? ???????? ???????? ???????? ???????? ???????? ???????? ????????
19e0: ???????? ???????? ???????? ???????? ???????? ???????? ???????? ????????
1a00: ???????? ???????? ???????? ???????? ???????? ???????? ???????? ????????
1a20: ???????? ???????? ???????? ???????? ???????? ???????? ???????? ????????
1a40: ???????? ???????? ???????? ???????? ???????? ???????? ???????? ????????
1a60: ???????? ???????? ???????? ???????? ???????? ???????? ???????? ????????
1a80: ???????? ???????? ???????? ???????? ???????? ???????? ???????? ????????
1aa0: ???????? ???????? ???????? ???????? ???????? ???????? ???????? ????????
1ac0: ???????? ???????? ???????? ???????? ???????? ???????? ???????? ????????
1ae0: ???????? ???????? ???????? ???????? ???????? ???????? ???????? ????????
1b00: ???????? ???????? ???????? ???????? ???????? ???????? ???????? ????????
1b20: ???????? ???????? ???????? ???????? ???????? ???????? ???????? ????????
1b40: ???????? ???????? ???????? ???????? ???????? ???????? ???????? ????????
1b60: ???????? ???????? ???????? ???????? ???????? ???????? ???????? ????????
1b80: ???????? ???????? ???????? ???????? ???????? ???????? ???????? ????????
1ba0: ???????? ???????? ???????? ???????? ???????? ???????? ???????? ????????
1bc0: ???????? ???????? ???????? ???????? ???????? ???????? ???????? ????????
1be0: ???????? ???????? ???????? ???????? ???????? ???????? ???????? ????????
1c00: ???????? ???????? ???????? ???????? ???????? ???????? ???????? ????????
1c20: ???????? ???????? ???????? ???????? ???????? ???????? ???????? ????????
1c40: ???????? ???????? ???????? ???????? ???????? ???????? ???????? ????????
1c60: ???????? ???????? ???????? ???????? ???????? ???????? ???????? ????????
1c80: ???????? ???????? ???????? ???????? ???????? ???????? ???????? ????????
1ca0: ???????? ???????? ???????? ???????? ???????? ???????? ???????? ????????
1cc0: ???????? ???????? ???????? ???????? ???????? ???????? ???????? ????????
1ce0: ???????? ???????? ???????? ???????? ???????? ???????? ???????? ????????
1d00: ???????? ???????? ???????? ???????? ???????? ???????? ???????? ????????
1d20: ???????? ???????? ???????? ???????? ???????? ???????? ???????? ????????
1d40: ???????? ???????? ???????? ???????? ???????? ???????? ???????? ????????
1d60: ???????? ???????? ???????? ???????? ???????? ???????? ???????? ????????
1d80: ???????? ???????? ???????? ???????? ???????? ???????? ???????? ????????
1da0: ???????? ???????? ???????? ???????? ???????? ???????? ???????? ????????
1dc0: ???????? ???????? ???????? ???????? ???????? ???????? ???????? ????????
1de0: ???????? ???????? ???????? ???????? ???????? ???????? ???????? ????????
1e00: ???????? ???????? ???????? ???????? ???????? ???????? ???????? ????????
1e20: ???????? ???????? ???????? ???????? ???????? ???????? ???????? ????????
1e40: ???????? ???????? ???????? ???????? ???????? ???????? ???????? ????????
1e60: ???????? ???????? ???????? ???????? ???????? ???????? ???????? ????????
1e80: ???????? ???????? ???????? ???????? ???????? ???????? ???????? ????????
1ea0: ???????? ???????? ???????? ???????? ???????? ???????? ???????? ????????
1ec0: ???????? ???????? ???????? ???????? ???????? ???????? ???????? ????????
1ee0: ???????? ???????? ???????? ???????? ???????? ???????? ???????? ????????
1f00: ???????? ???????? ???????? ???????? ???????? ???????? ???????? ????????
1f20: ???????? ???????? ???????? ???????? ???????? ???????? ???????? ????????
1f40: ???????? ???????? ???????? ???????? ???????? ???????? ???????? ????????
1f60: ???????? ???????? ???????? ???????? ???????? ???????? ???????? ????????
1f80: ???????? ???????? ???????? ???????? ???????? ???????? ???????? ????????
1fa0: ???????? ???????? ???????? ???????? ???????? ???????? ???????? ????????
1fc0: ???????? ???????? ???????? ???????? ???????? ???????? ???????? ????????
1fe0: ???????? ???????? ???????? ???????? ???????? ???????? ???????? ????????
[<c00546a8>] (rcu_check_callbacks) from [<c00574d4>]
(update_process_times+0x38/0x60)
[<c00574d4>] (update_process_times) from [<c0065e74>]
(tick_sched_timer+0x4c/0x98)
[<c0065e74>] (tick_sched_timer) from [<c0057e60>]
(__hrtimer_run_queues.constprop.36+0x124/0x1d4)
[<c0057e60>] (__hrtimer_run_queues.constprop.36) from [<c0058364>]
(hrtimer_interrupt+0x9c/0x270)
[<c0058364>] (hrtimer_interrupt) from [<c0286204>]
(integrator_timer_interrupt+0x20/0x2c)
[<c0286204>] (integrator_timer_interrupt) from [<c004abc4>]
(handle_irq_event_percpu+0x78/0x144)
[<c004abc4>] (handle_irq_event_percpu) from [<c004ace4>]
(handle_irq_event+0x54/0x8c)
[<c004ace4>] (handle_irq_event) from [<c004d600>] (handle_level_irq+0xdc/0x168)
[<c004d600>] (handle_level_irq) from [<c004a348>] (generic_handle_irq+0x2c/0x40)
[<c004a348>] (generic_handle_irq) from [<c004a580>]
(__handle_domain_irq+0x5c/0xd4)
[<c004a580>] (__handle_domain_irq) from [<c0009548>] (fpga_handle_irq+0x84/0xc4)
[<c0009548>] (fpga_handle_irq) from [<c000de04>] (__irq_svc+0x44/0x78)
Exception stack(0xc6421a68 to 0xc6421ab0)
1a60: ???????? ???????? ???????? ???????? ???????? ????????
1a80: ???????? ???????? ???????? ???????? ???????? ???????? ???????? ????????
1aa0: ???????? ???????? ???????? ????????
[<c000de04>] (__irq_svc) from [<c00b182c>]
(__slab_alloc.isra.90.constprop.92+0x124/0x2ec)
[<c00b182c>] (__slab_alloc.isra.90.constprop.92) from [<c00b1c48>]
(kmem_cache_alloc+0xf0/0x130)
[<c00b1c48>] (kmem_cache_alloc) from [<c0077600>] (mempool_alloc+0x44/0x1b8)
[<c0077600>] (mempool_alloc) from [<c0186290>] (bio_alloc_bioset+0x128/0x214)
[<c0186290>] (bio_alloc_bioset) from [<c018673c>] (bio_clone_bioset+0xf4/0x2cc)
[<c018673c>] (bio_clone_bioset) from [<c0190b50>] (blk_queue_split+0x1a4/0x438)
[<c0190b50>] (blk_queue_split) from [<c018ca10>] (blk_queue_bio+0x28/0x284)
[<c018ca10>] (blk_queue_bio) from [<c018adf8>] (generic_make_request+0xb8/0xdc)
[<c018adf8>] (generic_make_request) from [<c018ae9c>] (submit_bio+0x80/0x16c)
[<c018ae9c>] (submit_bio) from [<c00f04a4>] (__blockdev_direct_IO+0x11e4/0x1a4c)
[<c00f04a4>] (__blockdev_direct_IO) from [<c011ce0c>] (ext2_direct_IO+0x54/0x94)
[<c011ce0c>] (ext2_direct_IO) from [<c007642c>]
(generic_file_direct_write+0x94/0x1cc)
[<c007642c>] (generic_file_direct_write) from [<c0076618>]
(__generic_file_write_iter+0xb4/0x21c)
[<c0076618>] (__generic_file_write_iter) from [<c0076888>]
(generic_file_write_iter+0x108/0x2a0)
[<c0076888>] (generic_file_write_iter) from [<c00b7934>] (__vfs_write+0xb0/0xe4)
[<c00b7934>] (__vfs_write) from [<c00b8160>] (vfs_write+0x90/0x164)
[<c00b8160>] (vfs_write) from [<c00b89bc>] (SyS_write+0x44/0x9c)
[<c00b89bc>] (SyS_write) from [<c000a540>] (ret_fast_syscall+0x0/0x38)
Code: bad PC value
---[ end trace 59d7580d1dfe574e ]---
Kernel panic - not syncing: Fatal exception in interrupt
---[ end Kernel panic - not syncing: Fatal exception in interrupt
Yours,
Linus Walleij
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