8:13 a.m.
Hello
I reproduced ndctl blocked issue on 4.11.0-rc8, here is the reproduce steps and kernel
log, could you help check it? Thanks.
Reproduce steps:
function pmem_btt_dax_switch() {
sector_size_list="512 520 528 4096 4104 4160 4224"
for sector_size in $sector_size_list; do
ndctl create-namespace -f -e namespace${1}.0 --mode=sector -l
$sector_size
ndctl create-namespace -f -e namespace${1}.0 --mode=raw
ndctl create-namespace -f -e namespace${1}.0 --mode=dax
done
}
for i in 0 1 2 3; do
pmem_btt_dax_switch $i &
done
kernel log:
[ 6026.482747] INFO: task ndctl:5155 blocked for more than 120 seconds.
[ 6026.514573] Not tainted 4.11.0-rc8 #1
[ 6026.535467] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables
this message.
[ 6026.573932] ndctl D 0 5155 5154 0x00000080
[ 6026.600220] Call Trace:
[ 6026.611766] __schedule+0x289/0x8f0
[ 6026.628026] schedule+0x36/0x80
[ 6026.642725] schedule_preempt_disabled+0xe/0x10
[ 6026.663804] __mutex_lock.isra.8+0x266/0x500
[ 6026.683820] ? mntput+0x24/0x40
[ 6026.698596] __mutex_lock_slowpath+0x13/0x20
[ 6026.718558] mutex_lock+0x2f/0x40
[ 6026.734046] region_size_show+0x20/0x70 [dax]
[ 6026.754563] dev_attr_show+0x20/0x50
[ 6026.771246] ? mutex_lock+0x12/0x40
[ 6026.787201] sysfs_kf_seq_show+0xbf/0x1a0
[ 6026.805510] kernfs_seq_show+0x21/0x30
[ 6026.823174] seq_read+0x115/0x390
[ 6026.838263] ? do_filp_open+0xa5/0x100
[ 6026.855906] kernfs_fop_read+0xff/0x180
[ 6026.873983] __vfs_read+0x37/0x150
[ 6026.889786] ? security_file_permission+0x9d/0xc0
[ 6026.911642] vfs_read+0x8c/0x130
[ 6026.926874] SyS_read+0x55/0xc0
[ 6026.941636] do_syscall_64+0x67/0x180
[ 6026.959003] entry_SYSCALL64_slow_path+0x25/0x25
[ 6026.980692] RIP: 0033:0x7f24eba9c7e0
[ 6026.999534] RSP: 002b:00007fff94cbb658 EFLAGS: 00000246 ORIG_RAX: 0000000000000000
[ 6027.035833] RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 00007f24eba9c7e0
[ 6027.071099] RDX: 0000000000000400 RSI: 00007fff94cbb680 RDI: 0000000000000004
[ 6027.106350] RBP: 0000000001d784e0 R08: 00007f24eb9fb988 R09: 0000000000000027
[ 6027.141119] R10: 000000000000000a R11: 0000000000000246 R12: 00007fff94cbb680
[ 6027.175009] R13: 0000000001d73270 R14: 00007fff94cbb680 R15: 0000000001d7b333
[ 6027.208899] INFO: task ndctl:5164 blocked for more than 120 seconds.
[ 6027.238487] Not tainted 4.11.0-rc8 #1
[ 6027.258025] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables
this message.
[ 6027.296084] ndctl D 0 5164 5163 0x00000080
[ 6027.321726] Call Trace:
[ 6027.333199] __schedule+0x289/0x8f0
[ 6027.349688] schedule+0x36/0x80
[ 6027.364463] schedule_preempt_disabled+0xe/0x10
[ 6027.385667] __mutex_lock.isra.8+0x266/0x500
[ 6027.405824] ? refcount_dec_and_test+0x11/0x20
[ 6027.426656] ? wait_probe_show+0x70/0x70 [libnvdimm]
[ 6027.449966] __mutex_lock_slowpath+0x13/0x20
[ 6027.470000] mutex_lock+0x2f/0x40
[ 6027.485369] flush_regions_dimms+0x1b/0x40 [libnvdimm]
[ 6027.509549] device_for_each_child+0x50/0x90
[ 6027.529466] wait_probe_show+0x46/0x70 [libnvdimm]
[ 6027.551543] dev_attr_show+0x20/0x50
[ 6027.569666] ? mutex_lock+0x12/0x40
[ 6027.586494] sysfs_kf_seq_show+0xbf/0x1a0
[ 6027.607243] kernfs_seq_show+0x21/0x30
[ 6027.625886] seq_read+0x115/0x390
[ 6027.641497] ? do_filp_open+0xa5/0x100
[ 6027.659110] kernfs_fop_read+0xff/0x180
[ 6027.677120] __vfs_read+0x37/0x150
[ 6027.692972] ? security_file_permission+0x9d/0xc0
[ 6027.714948] vfs_read+0x8c/0x130
[ 6027.730083] SyS_read+0x55/0xc0
[ 6027.745087] do_syscall_64+0x67/0x180
[ 6027.762273] entry_SYSCALL64_slow_path+0x25/0x25
[ 6027.784092] RIP: 0033:0x7f08e08527e0
[ 6027.800715] RSP: 002b:00007fff5ffcd358 EFLAGS: 00000246 ORIG_RAX: 0000000000000000
[ 6027.836082] RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00007f08e08527e0
[ 6027.869667] RDX: 0000000000000400 RSI: 00007fff5ffcd380 RDI: 0000000000000003
[ 6027.904697] RBP: 0000000000000000 R08: 00007f08e07b1988 R09: 0000000000000046
[ 6027.938016] R10: 0000000000000046 R11: 0000000000000246 R12: 00007fff5ffcd380
[ 6027.970932] R13: 0000000000000000 R14: 0000000000001388 R15: 00007fff5ffcd380
[ 6028.004331] INFO: task ndctl:5172 blocked for more than 120 seconds.
[ 6028.034311] Not tainted 4.11.0-rc8 #1
[ 6028.053796] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables
this message.
[ 6028.092317] ndctl D 0 5172 5171 0x00000080
[ 6028.120694] Call Trace:
[ 6028.132134] __schedule+0x289/0x8f0
[ 6028.148496] schedule+0x36/0x80
[ 6028.163221] schedule_preempt_disabled+0xe/0x10
[ 6028.184498] __mutex_lock.isra.8+0x266/0x500
[ 6028.204502] ? refcount_dec_and_test+0x11/0x20
[ 6028.225383] ? wait_probe_show+0x70/0x70 [libnvdimm]
[ 6028.248818] __mutex_lock_slowpath+0x13/0x20
[ 6028.268915] mutex_lock+0x2f/0x40
[ 6028.284572] flush_regions_dimms+0x1b/0x40 [libnvdimm]
[ 6028.308483] device_for_each_child+0x50/0x90
[ 6028.328625] wait_probe_show+0x46/0x70 [libnvdimm]
[ 6028.351106] dev_attr_show+0x20/0x50
[ 6028.367457] ? mutex_lock+0x12/0x40
[ 6028.383180] sysfs_kf_seq_show+0xbf/0x1a0
[ 6028.401459] kernfs_seq_show+0x21/0x30
[ 6028.418997] seq_read+0x115/0x390
[ 6028.434451] ? do_filp_open+0xa5/0x100
[ 6028.451975] kernfs_fop_read+0xff/0x180
[ 6028.469849] __vfs_read+0x37/0x150
[ 6028.485746] ? security_file_permission+0x9d/0xc0
[ 6028.507435] vfs_read+0x8c/0x130
[ 6028.522452] SyS_read+0x55/0xc0
[ 6028.537079] do_syscall_64+0x67/0x180
[ 6028.554153] entry_SYSCALL64_slow_path+0x25/0x25
[ 6028.575778] RIP: 0033:0x7eff768387e0
[ 6028.592970] RSP: 002b:00007ffcf5367668 EFLAGS: 00000246 ORIG_RAX: 0000000000000000
[ 6028.631343] RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00007eff768387e0
[ 6028.664793] RDX: 0000000000000400 RSI: 00007ffcf5367690 RDI: 0000000000000003
[ 6028.698191] RBP: 0000000000000000 R08: 00007eff76797988 R09: 0000000000000046
[ 6028.731690] R10: 0000000000000046 R11: 0000000000000246 R12: 00007ffcf5367690
[ 6028.765029] R13: 0000000000000000 R14: 0000000000001388 R15: 00007ffcf5367690
[ 6028.798470] INFO: task ndctl:5180 blocked for more than 120 seconds.
[ 6028.828412] Not tainted 4.11.0-rc8 #1
[ 6028.848058] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables
this message.
[ 6028.884846] ndctl D 0 5180 5179 0x00000080
[ 6028.910311] Call Trace:
[ 6028.921891] __schedule+0x289/0x8f0
[ 6028.938354] schedule+0x36/0x80
[ 6028.952914] __kernfs_remove+0x169/0x220
[ 6028.971210] ? remove_wait_queue+0x60/0x60
[ 6028.990431] kernfs_remove_by_name_ns+0x43/0xa0
[ 6029.011866] remove_files.isra.1+0x36/0x70
[ 6029.032520] sysfs_remove_group+0x44/0x90
[ 6029.051185] sysfs_remove_groups+0x2e/0x50
[ 6029.070831] dax_region_unregister+0x21/0x40 [dax]
[ 6029.093260] devm_action_release+0xf/0x20
[ 6029.113529] release_nodes+0x218/0x260
[ 6029.132924] devres_release_all+0x3c/0x60
[ 6029.152249] device_release_driver_internal+0x151/0x1f0
[ 6029.176701] device_release_driver+0x12/0x20
[ 6029.196651] unbind_store+0xba/0xe0
[ 6029.213026] drv_attr_store+0x24/0x30
[ 6029.229987] sysfs_kf_write+0x3a/0x50
[ 6029.247412] kernfs_fop_write+0xff/0x180
[ 6029.265909] __vfs_write+0x37/0x160
[ 6029.282231] ? selinux_file_permission+0xe5/0x120
[ 6029.304504] ? security_file_permission+0x3b/0xc0
[ 6029.326647] vfs_write+0xb2/0x1b0
[ 6029.341929] ? syscall_trace_enter+0x1d0/0x2b0
[ 6029.362863] SyS_write+0x55/0xc0
[ 6029.377955] do_syscall_64+0x67/0x180
[ 6029.395080] entry_SYSCALL64_slow_path+0x25/0x25
[ 6029.416677] RIP: 0033:0x7f83a79b7840
[ 6029.433311] RSP: 002b:00007ffca25e4198 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
[ 6029.468729] RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00007f83a79b7840
[ 6029.502221] RDX: 0000000000000007 RSI: 00000000016deb90 RDI: 0000000000000003
[ 6029.535277] RBP: 00000000016deb90 R08: 00007f83a7916988 R09: 0000000000000046
[ 6029.568341] R10: 00007ffca25e3eb0 R11: 0000000000000246 R12: 0000000000000007
[ 6029.601701] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000002
#ps aux | grep ndctl
root 5155 0.0 0.0 41576 3044 pts/0 D+ 10:53 0:00 ndctl create-namespace -f
-e namespace2.0 --mode=dax
root 5164 0.0 0.0 41576 3040 pts/0 D+ 10:53 0:00 ndctl create-namespace -f
-e namespace0.0 --mode=dax
root 5172 0.1 0.0 41576 3024 pts/0 D+ 10:53 0:00 ndctl create-namespace -f
-e namespace3.0 --mode=dax
root 5180 0.0 0.0 41576 3036 pts/0 D+ 10:53 0:00 ndctl create-namespace -f
-e namespace1.0 --mode=sector -l 528
# cat /proc/5155/stack
[<ffffffffc096f320>] region_size_show+0x20/0x70 [dax]
[<ffffffffbeae2fb0>] dev_attr_show+0x20/0x50
[<ffffffffbe8ca08f>] sysfs_kf_seq_show+0xbf/0x1a0
[<ffffffffbe8c8741>] kernfs_seq_show+0x21/0x30
[<ffffffffbe866f65>] seq_read+0x115/0x390
[<ffffffffbe8c8ebf>] kernfs_fop_read+0xff/0x180
[<ffffffffbe83ebe7>] __vfs_read+0x37/0x150
[<ffffffffbe83fb2c>] vfs_read+0x8c/0x130
[<ffffffffbe841105>] SyS_read+0x55/0xc0
[<ffffffffbe603a47>] do_syscall_64+0x67/0x180
[<ffffffffbed5602b>] entry_SYSCALL64_slow_path+0x25/0x25
[<ffffffffffffffff>] 0xffffffffffffffff
# cat /proc/5164/stack
[<ffffffffc0bf720b>] flush_regions_dimms+0x1b/0x40 [libnvdimm]
[<ffffffffbeae2b30>] device_for_each_child+0x50/0x90
[<ffffffffc0bf71c6>] wait_probe_show+0x46/0x70 [libnvdimm]
[<ffffffffbeae2fb0>] dev_attr_show+0x20/0x50
[<ffffffffbe8ca08f>] sysfs_kf_seq_show+0xbf/0x1a0
[<ffffffffbe8c8741>] kernfs_seq_show+0x21/0x30
[<ffffffffbe866f65>] seq_read+0x115/0x390
[<ffffffffbe8c8ebf>] kernfs_fop_read+0xff/0x180
[<ffffffffbe83ebe7>] __vfs_read+0x37/0x150
[<ffffffffbe83fb2c>] vfs_read+0x8c/0x130
[<ffffffffbe841105>] SyS_read+0x55/0xc0
[<ffffffffbe603a47>] do_syscall_64+0x67/0x180
[<ffffffffbed5602b>] entry_SYSCALL64_slow_path+0x25/0x25
[<ffffffffffffffff>] 0xffffffffffffffff
# cat /proc/5172/stack
[<ffffffffc0bf720b>] flush_regions_dimms+0x1b/0x40 [libnvdimm]
[<ffffffffbeae2b30>] device_for_each_child+0x50/0x90
[<ffffffffc0bf71c6>] wait_probe_show+0x46/0x70 [libnvdimm]
[<ffffffffbeae2fb0>] dev_attr_show+0x20/0x50
[<ffffffffbe8ca08f>] sysfs_kf_seq_show+0xbf/0x1a0
[<ffffffffbe8c8741>] kernfs_seq_show+0x21/0x30
[<ffffffffbe866f65>] seq_read+0x115/0x390
[<ffffffffbe8c8ebf>] kernfs_fop_read+0xff/0x180
[<ffffffffbe83ebe7>] __vfs_read+0x37/0x150
[<ffffffffbe83fb2c>] vfs_read+0x8c/0x130
[<ffffffffbe841105>] SyS_read+0x55/0xc0
[<ffffffffbe603a47>] do_syscall_64+0x67/0x180
[<ffffffffbed5602b>] entry_SYSCALL64_slow_path+0x25/0x25
[<ffffffffffffffff>] 0xffffffffffffffff
# cat /proc/5180/stack
[<ffffffffbe8c7669>] __kernfs_remove+0x169/0x220
[<ffffffffbe8c8523>] kernfs_remove_by_name_ns+0x43/0xa0
[<ffffffffbe8cad26>] remove_files.isra.1+0x36/0x70
[<ffffffffbe8cb0e4>] sysfs_remove_group+0x44/0x90
[<ffffffffbe8cb1de>] sysfs_remove_groups+0x2e/0x50
[<ffffffffc09700a1>] dax_region_unregister+0x21/0x40 [dax]
[<ffffffffbeaec2ef>] devm_action_release+0xf/0x20
[<ffffffffbeaed038>] release_nodes+0x218/0x260
[<ffffffffbeaed28c>] devres_release_all+0x3c/0x60
[<ffffffffbeae8d71>] device_release_driver_internal+0x151/0x1f0
[<ffffffffbeae8e22>] device_release_driver+0x12/0x20
[<ffffffffbeae6a3a>] unbind_store+0xba/0xe0
[<ffffffffbeae6034>] drv_attr_store+0x24/0x30
[<ffffffffbe8c9c3a>] sysfs_kf_write+0x3a/0x50
[<ffffffffbe8c971f>] kernfs_fop_write+0xff/0x180
[<ffffffffbe83ed37>] __vfs_write+0x37/0x160
[<ffffffffbe83fc82>] vfs_write+0xb2/0x1b0
[<ffffffffbe8411c5>] SyS_write+0x55/0xc0
[<ffffffffbe603a47>] do_syscall_64+0x67/0x180
[<ffffffffbed5602b>] entry_SYSCALL64_slow_path+0x25/0x25
[<ffffffffffffffff>] 0xffffffffffffffff
Best Regards,
Yi Zhang