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Subject[PATCH] edac, poll timeout cannot be zero
Date
If you do

echo 0 > /sys/module/edac_core/parameters/edac_mc_poll_msec

the following stack trace is output because the edac module is not
designed to poll with a timeout of zero.

------------[ cut here ]------------
WARNING: CPU: 12 PID: 0 at lib/list_debug.c:33 __list_add+0xac/0xc0()
list_add corruption. prev->next should be next (ffff8808291dd1b8), but was (null). (prev=ffff8808286fe3f8).
Modules linked in: sg nfsv3 rpcsec_gss_krb5 nfsv4 dns_resolver nfs fscache cfg80211 rfkill x86_pkg_temp_thermal coretemp kvm_intel kvm ixgbe e1000e crct10dif_pclmul crc32_pclmul crc32c_intel ghash_clmulni_intel aesni_intel lrw gf128mul glue_helper ablk_helper cryptd iTCO_wdt ptp sb_edac iTCO_vendor_support pps_core mdio ipmi_devintf edac_core ioatdma microcode shpchp lpc_ich pcspkr i2c_i801 dca mfd_core ipmi_si wmi ipmi_msghandler nfsd auth_rpcgss nfs_acl lockd sunrpc xfs libcrc32c sd_mod sr_mod cdrom crc_t10dif crct10dif_common mgag200 syscopyarea sysfillrect sysimgblt isci i2c_algo_bit drm_kms_helper ttm drm libsas ahci libahci scsi_transport_sas libata i2c_core dm_mirror dm_region_hash dm_log dm_mod
CPU: 12 PID: 0 Comm: swapper/12 Not tainted 3.13.0+ #1
Hardware name: Intel Corporation LH Pass ........../SVRBD-ROW_T, BIOS SE5C600.86B.01.08.0003.022620131521 02/26/2013
0000000000000009 ffff88082f683cc8 ffffffff815f1945 ffff88082f683d10
ffff88082f683d00 ffffffff81069dad ffff880826f9b248 ffff8808291dd1b8
ffff8808286fe3f8 ffff8808291dc000 0000000000000000 ffff88082f683d60
Call Trace:
<IRQ> [<ffffffff815f1945>] dump_stack+0x45/0x56
[<ffffffff81069dad>] warn_slowpath_common+0x7d/0xa0
[<ffffffff81069e1c>] warn_slowpath_fmt+0x4c/0x50
[<ffffffff812dd0fc>] __list_add+0xac/0xc0
[<ffffffff8107570b>] __internal_add_timer+0xab/0x130
[<ffffffff81075907>] internal_add_timer+0x17/0x40
[<ffffffff81077dfa>] mod_timer_pinned+0xca/0x170
[<ffffffff8149f7f0>] ? pid_param_set+0x130/0x130
[<ffffffff8149fa7a>] intel_pstate_timer_func+0x28a/0x380
[<ffffffff8149f7f0>] ? pid_param_set+0x130/0x130
[<ffffffff810757d6>] call_timer_fn+0x36/0x100
[<ffffffff8149f7f0>] ? pid_param_set+0x130/0x130
[<ffffffff810767ff>] run_timer_softirq+0x1ff/0x2f0
[<ffffffff8106f3b5>] __do_softirq+0xf5/0x2e0
[<ffffffff8106f87d>] irq_exit+0x10d/0x120
[<ffffffff816042b5>] smp_apic_timer_interrupt+0x45/0x60
[<ffffffff81602c1d>] apic_timer_interrupt+0x6d/0x80
<EOI> [<ffffffff814a022f>] ? cpuidle_enter_state+0x4f/0xc0
[<ffffffff814a0228>] ? cpuidle_enter_state+0x48/0xc0
[<ffffffff814a0359>] cpuidle_idle_call+0xb9/0x1f0
[<ffffffff8101e44e>] arch_cpu_idle+0xe/0x30
[<ffffffff810c327e>] cpu_startup_entry+0x9e/0x240
[<ffffffff81043544>] start_secondary+0x1e4/0x290
---[ end trace 078b214fc68689e6 ]---
------------[ cut here ]------------
------------[ cut here ]------------
kernel BUG at kernel/timer.c:1084!
invalid opcode: 0000 [#1] SMP
Modules linked in: sg nfsv3 rpcsec_gss_krb5 nfsv4 dns_resolver nfs fscache cfg80211 rfkill x86_pkg_temp_thermal coretemp kvm_intel kvm ixgbe e1000e crct10dif_pclmul crc32_pclmul crc32c_intel ghash_clmulni_intel aesni_intel lrw gf128mul glue_helper ablk_helper cryptd iTCO_wdt ptp sb_edac iTCO_vendor_support pps_core mdio ipmi_devintf edac_core ioatdma microcode shpchp lpc_ich pcspkr i2c_i801 dca mfd_core ipmi_si wmi ipmi_msghandler nfsd auth_rpcgss nfs_acl lockd sunrpc xfs libcrc32c sd_mod sr_mod cdrom crc_t10dif crct10dif_common mgag200 syscopyarea sysfillrect sysimgblt isci i2c_algo_bit drm_kms_helper ttm drm libsas ahci libahci scsi_transport_sas libata i2c_core dm_mirror dm_region_hash dm_log dm_mod
CPU: 12 PID: 0 Comm: swapper/12 Tainted: G W 3.13.0+ #1
Hardware name: Intel Corporation LH Pass ........../SVRBD-ROW_T, BIOS SE5C600.86B.01.08.0003.022620131521 02/26/2013
task: ffff880428eadd30 ti: ffff880428eb8000 task.ti: ffff880428eb8000
RIP: 0010:[<ffffffff810759c3>] [<ffffffff810759c3>] cascade+0x93/0xa0
RSP: 0018:ffff88082f683e70 EFLAGS: 00010083
RAX: ffffffff81c64580 RBX: 0000000000000000 RCX: ffff88082f683ed8
RDX: 0000000000000019 RSI: ffff8808286f83f8 RDI: ffff8808291dc000
RBP: ffff88082f683ea0 R08: ffff8808291dd3b8 R09: 0000000000000100
R10: 0000000000000000 R11: ffff88082f6839fe R12: ffff8808291dc000
R13: ffff88082f683e70 R14: 0000000000000019 R15: ffff88082f683ed8
FS: 0000000000000000(0000) GS:ffff88082f680000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000004a4fb0 CR3: 00000000018f8000 CR4: 00000000000407e0
Stack:
ffff8808286f83f8 ffff880826f9b248 ffff8808291dc000 0000000000000000
ffffffff81083c10 0000000000000002 ffff88082f683f10 ffffffff81076845
ffff8808291ddc28 ffff8808291dd828 ffff8808291dd428 ffff8808291dd028
Call Trace:
<IRQ>
[<ffffffff81083c10>] ? __queue_work+0x320/0x320
[<ffffffff81076845>] run_timer_softirq+0x245/0x2f0
[<ffffffff8106f3b5>] __do_softirq+0xf5/0x2e0
[<ffffffff8106f87d>] irq_exit+0x10d/0x120
[<ffffffff816042b5>] smp_apic_timer_interrupt+0x45/0x60
[<ffffffff81602c1d>] apic_timer_interrupt+0x6d/0x80
<EOI>
[<ffffffff814a022f>] ? cpuidle_enter_state+0x4f/0xc0
[<ffffffff814a0228>] ? cpuidle_enter_state+0x48/0xc0
[<ffffffff814a0359>] cpuidle_idle_call+0xb9/0x1f0
[<ffffffff8101e44e>] arch_cpu_idle+0xe/0x30
[<ffffffff810c327e>] cpu_startup_entry+0x9e/0x240
[<ffffffff81043544>] start_secondary+0x1e4/0x290
Code: 49 39 cc 75 26 48 89 de 48 89 c3 4c 89 e7 e8 b5 fc ff ff 4c 39 eb 48 8b 03 75 dd 48 83 c4 10 44 89 f0 5b 41 5c 41 5d 41 5e 5d c3 <0f> 0b 66 66 2e 0f 1f 84 00 00 00 00 00 66 66 66 66 90 55 48 89
RIP [<ffffffff810759c3>] cascade+0x93/0xa0
RSP <ffff88082f683e70>
WARNING: CPU: 36 PID: 1154 at kernel/workqueue.c:1461 __queue_delayed_work+0xed/0x1a0()
[ 3108.665556] Modules linked in: sg nfsv3 rpcsec_gss_krb5 nfsv4 dns_resolver nfs fscache cfg80211 rfkill x86_pkg_temp_thermal coretemp kvm_intel kvm ixgbe e1000e crct10dif_pclmul crc32_pclmul crc32c_intel ghash_clmulni_intel aesni_intel lrw gf128mul glue_helper ablk_helper cryptd iTCO_wdt ptp sb_edac iTCO_vendor_support pps_core mdio ipmi_devintf edac_core ioatdma microcode shpchp lpc_ich pcspkr i2c_i801 dca mfd_core ipmi_si wmi ipmi_msghandler nfsd auth_rpcgss nfs_acl lockd sunrpc xfs libcrc32c sd_mod sr_mod cdrom crc_t10dif crct10dif_common mgag200 syscopyarea sysfillrect sysimgblt isci i2c_algo_bit drm_kms_helper ttm drm libsas ahci libahci scsi_transport_sas libata i2c_core dm_mirror dm_region_hash dm_log dm_mod
[ 3108.737843] CPU: 36 PID: 1154 Comm: kworker/u481:3 Tainted: G W 3.13.0+ #1
[ 3108.746480] Hardware name: Intel Corporation LH Pass ........../SVRBD-ROW_T, BIOS SE5C600.86B.01.08.0003.022620131521 02/26/2013
[ 3108.759435] Workqueue: edac-poller edac_mc_workq_function [edac_core]
[ 3108.766630] 0000000000000009 ffff880425137d70 ffffffff815f1945 0000000000000000
[ 3108.774932] ffff880425137da8 ffffffff81069dad 0000000000002000 ffff880826bb1200
[ 3108.783230] ffff8808286fe3f8 ffff880036371000 0000000000003c20 ffff880425137db8
[ 3108.791521] Call Trace:
[ 3108.794265] [<ffffffff815f1945>] dump_stack+0x45/0x56
[ 3108.800015] [<ffffffff81069dad>] warn_slowpath_common+0x7d/0xa0
[ 3108.806732] [<ffffffff81069e8a>] warn_slowpath_null+0x1a/0x20
[ 3108.813238] [<ffffffff81083d1d>] __queue_delayed_work+0xed/0x1a0
[ 3108.820034] [<ffffffff81084077>] queue_delayed_work_on+0x27/0x50
[ 3108.826831] [<ffffffffa14b0392>] edac_mc_workq_function+0x72/0xa0 [edac_core]
[ 3108.834908] [<ffffffff81085c3b>] process_one_work+0x17b/0x460
[ 3108.841414] [<ffffffff810869db>] worker_thread+0x11b/0x400
[ 3108.847635] [<ffffffff810868c0>] ? rescuer_thread+0x3e0/0x3e0
[ 3108.854143] [<ffffffff8108d612>] kthread+0xd2/0xf0
[ 3108.859584] [<ffffffff8108d540>] ? kthread_create_on_node+0x180/0x180
[ 3108.866873] [<ffffffff81601efc>] ret_from_fork+0x7c/0xb0
[ 3108.872896] [<ffffffff8108d540>] ? kthread_create_on_node+0x180/0x180
[ 3108.880176] ---[ end trace 078b214fc68689e7 ]---

This patch adds a range check in the edac_mc_poll_msec code to check for 0.

Signed-off-by: Prarit Bhargava <prarit@redhat.com>
Cc: Doug Thompson <dougthompson@xmission.com>
Cc: linux-kernel@vger.kernel.org
---
drivers/edac/edac_mc_sysfs.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/edac/edac_mc_sysfs.c b/drivers/edac/edac_mc_sysfs.c
index 51c0362..8ec1747 100644
--- a/drivers/edac/edac_mc_sysfs.c
+++ b/drivers/edac/edac_mc_sysfs.c
@@ -61,7 +61,7 @@ static int edac_set_poll_msec(const char *val, struct kernel_param *kp)
ret = kstrtol(val, 0, &l);
if (ret)
return ret;
- if ((int)l != l)
+ if (!l || ((int)l != l))
return -EINVAL;
*((int *)kp->arg) = l;

--
1.7.9.3


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