bcache_gc call trace linux-3.17-rc4

[Thomas Stein]

Hello.

I'v got a kernel crash with the following call trace:

Sep 15 10:13:48 hn kernel: [82567.843075] Task dump for CPU 0:
Sep 15 10:13:48 hn kernel: [82567.843078] bcache_gc R running
task 12248 28611 2 0x00080808
Sep 15 10:13:48 hn kernel: [82567.843083] ffffffff81c411c0
ffff88083fa03d78 ffffffff81071492 0000000000000000
Sep 15 10:13:48 hn kernel: [82567.843087] ffffffff81c411c0
ffff88083fa03d98 ffffffff810740b8 ffff88083fa03dd8
Sep 15 10:13:48 hn kernel: [82567.843090] 0000000000000000
ffff88083fa03dc8 ffffffff8108f335 ffff88083fa0d280
Sep 15 10:13:48 hn kernel: [82567.843093] Call Trace:
Sep 15 10:13:48 hn kernel: [82567.843096] <IRQ> [<ffffffff81071492>]
sched_show_task+0xc2/0x130
Sep 15 10:13:48 hn kernel: [82567.843108] [<ffffffff810740b8>]
dump_cpu_task+0x38/0x40
Sep 15 10:13:48 hn kernel: [82567.843119] [<ffffffff8108f335>]
rcu_dump_cpu_stacks+0x85/0xc0
Sep 15 10:13:48 hn kernel: [82567.843131] [<ffffffff81092610>]
rcu_check_callbacks+0x3c0/0x680
Sep 15 10:13:48 hn kernel: [82567.843135] [<ffffffff81096e13>]
update_process_times+0x43/0x80
Sep 15 10:13:48 hn kernel: [82567.843139] [<ffffffff810a54f1>]
tick_sched_handle.isra.13+0x31/0x40
Sep 15 10:13:48 hn kernel: [82567.843142] [<ffffffff810a5667>]
tick_sched_timer+0x47/0x70
Sep 15 10:13:48 hn kernel: [82567.843146] [<ffffffff8109766b>]
__run_hrtimer+0x7b/0x1c0
Sep 15 10:13:48 hn kernel: [82567.843149] [<ffffffff810a5620>] ?
tick_sched_do_timer+0x30/0x30
Sep 15 10:13:48 hn kernel: [82567.843153] [<ffffffff81097e37>]
hrtimer_interrupt+0xf7/0x230
Sep 15 10:13:48 hn kernel: [82567.843158] [<ffffffff81033196>]
local_apic_timer_interrupt+0x36/0x60
Sep 15 10:13:48 hn kernel: [82567.843162] [<ffffffff810334de>]
smp_apic_timer_interrupt+0x3e/0x60
Sep 15 10:13:48 hn kernel: [82567.843166] [<ffffffff8166994a>]
apic_timer_interrupt+0x6a/0x70
Sep 15 10:13:48 hn kernel: [82567.843168] <EOI> [<ffffffff8148f848>] ?
btree_gc_count_keys+0x28/0x60
Sep 15 10:13:48 hn kernel: [82567.843175] [<ffffffff8148f869>] ?
btree_gc_count_keys+0x49/0x60
Sep 15 10:13:48 hn kernel: [82567.843178] [<ffffffff814950b5>]
btree_gc_recurse+0x1b5/0x320
Sep 15 10:13:48 hn kernel: [82567.843182] [<ffffffff814904f3>] ?
btree_gc_mark_node+0x63/0x240
Sep 15 10:13:48 hn kernel: [82567.843186] [<ffffffff81080b2e>] ?
__wake_up+0x4e/0x70
Sep 15 10:13:48 hn kernel: [82567.843190] [<ffffffff81495635>]
bch_btree_gc+0x415/0x5a0
Sep 15 10:13:48 hn kernel: [82567.843194] [<ffffffff81080780>] ?
finish_wait+0x80/0x80
Sep 15 10:13:48 hn kernel: [82567.843197] [<ffffffff814957f8>]
bch_gc_thread+0x38/0x120
Sep 15 10:13:48 hn kernel: [82567.843200] [<ffffffff814957c0>] ?
bch_btree_gc+0x5a0/0x5a0
Sep 15 10:13:48 hn kernel: [82567.843204] [<ffffffff810672b4>]
kthread+0xc4/0xe0
Sep 15 10:13:48 hn kernel: [82567.843207] [<ffffffff810671f0>] ?
kthread_worker_fn+0x150/0x150
Sep 15 10:13:48 hn kernel: [82567.843211] [<ffffffff81668aac>]
ret_from_fork+0x7c/0xb0
Sep 15 10:13:48 hn kernel: [82567.843214] [<ffffffff810671f0>] ?
kthread_worker_fn+0x150/0x150

I had to push the reset button to get the machine running again.

best regards
t.