Runtime warnings in powerpc code

Guenter Roeck linux at roeck-us.net
Fri Dec 28 06:05:42 AEDT 2018 

Hi,

I am getting the attached runtime warnings when enabling certain debug
options in powerpc code. The warnings are seen with pretty much all
platforms, and all active kernel releases.

Question: Is it worthwhile to keep building / testing powerpc builds
with the respective debug options enabled, and report it once in a while,
or should I just disable the options ?

Thanks,
Guenter

---
CONFIG_DEBUG_ATOMIC_SLEEP

------------[ cut here ]------------
do not call blocking ops when !TASK_RUNNING; state=2 set at [<(ptrval)>]
prepare_to_wait+0x54/0xe4
WARNING: CPU: 0 PID: 1 at kernel/sched/core.c:6099 __might_sleep+0x94/0x9c
Modules linked in:
CPU: 0 PID: 1 Comm: init Not tainted 4.20.0-yocto-standard+ #1
NIP:  c00667a0 LR: c00667a0 CTR: 00000000
REGS: cf8df8c0 TRAP: 0700   Not tainted  (4.20.0-yocto-standard+)
MSR:  00029032 <EE,ME,IR,DR,RI>  CR: 28888822  XER: 20000000

GPR00: c00667a0 cf8df970 cf8e0000 00000062 c0af15c8 00000007 fa1ae97e 757148e2 
GPR08: cf8de000 00000000 00000000 00000000 1f386000 00000000 00000000 cfd83c8c 
GPR16: 00000004 00000004 00000004 00000000 0000060c 0000000a cf8dfdb8 cf267804 
GPR24: cf8dfd78 cf8dfd68 cfa88a20 cec70830 00000001 00000000 000001d3 c0b444cc 
NIP [c00667a0] __might_sleep+0x94/0x9c
LR [c00667a0] __might_sleep+0x94/0x9c
Call Trace:
[cf8df970] [c00667a0] __might_sleep+0x94/0x9c (unreliable)
[cf8df990] [c05beddc] do_ide_request+0x48/0x6bc
[cf8dfa10] [c0492bcc] __blk_run_queue+0x80/0x10c
[cf8dfa20] [c049a938] blk_flush_plug_list+0x23c/0x258
[cf8dfa60] [c006b888] io_schedule_prepare+0x44/0x5c
[cf8dfa70] [c006b8c0] io_schedule+0x20/0x48
[cf8dfa80] [c095e1ac] bit_wait_io+0x24/0x74
[cf8dfa90] [c095dd94] __wait_on_bit+0xac/0x104
[cf8dfab0] [c095de74] out_of_line_wait_on_bit+0x88/0x98
[cf8dfae0] [c0229094] bh_submit_read+0xf8/0x104
[cf8dfaf0] [c028b9a8] ext4_get_branch+0xdc/0x168
[cf8dfb20] [c028c7fc] ext4_ind_map_blocks+0x2b0/0xc08
[cf8dfc30] [c029551c] ext4_map_blocks+0x2e0/0x65c
[cf8dfc80] [c02b8c84] ext4_mpage_readpages+0x5e8/0x97c
[cf8dfd60] [c016c3cc] read_pages+0x60/0x1a0
[cf8dfdb0] [c016c6e8] __do_page_cache_readahead+0x1dc/0x208
[cf8dfe10] [c0159768] filemap_fault+0x418/0x834
[cf8dfe50] [c02a00fc] ext4_filemap_fault+0x40/0x64
[cf8dfe60] [c0198d0c] __do_fault+0x34/0xb8
[cf8dfe70] [c019e264] handle_mm_fault+0xc44/0xf88
[cf8dfef0] [c001a218] __do_page_fault+0x158/0x7b4
[cf8dff40] [c00143b4] handle_page_fault+0x14/0x40
--- interrupt: 301 at 0xb7904a70
    LR = 0xb78ef0c8
Instruction dump:
7fe3fb78 bba10014 7c0803a6 38210020 4bfffd20 808a0000 3c60c0b0 39400001 
7cc53378 3863a558 99490001 4bfd03bd <0fe00000> 4bffffc0 7c0802a6 90010004 
irq event stamp: 126702
hardirqs last  enabled at (126701): [<c0091a74>] console_unlock+0x434/0x5d0
hardirqs last disabled at (126702): [<c00140b4>] reenable_mmu+0x30/0x88
softirqs last  enabled at (126552): [<c0964614>] __do_softirq+0x42c/0x4a0
softirqs last disabled at (126529): [<c003cda4>] irq_exit+0x104/0x108
---[ end trace 4f6c84b7815474d9 ]---

---
#if defined(CONFIG_PROVE_LOCKING) && defined(CONFIG_DEBUG_LOCKDEP) && \
    defined(CONFIG_TRACE_IRQFLAGS)

------------[ cut here ]------------
DEBUG_LOCKS_WARN_ON(!current->hardirqs_enabled)
WARNING: CPU: 0 PID: 1 at kernel/locking/lockdep.c:3762
check_flags.part.25+0x1a0/0x1c4
Modules linked in:
CPU: 0 PID: 1 Comm: init Tainted: G        W         4.20.0-yocto-standard+ #1
NIP:  c00839f0 LR: c00839f0 CTR: 00000000
REGS: cf8dfe00 TRAP: 0700   Tainted: G        W
(4.20.0-yocto-standard+)
MSR:  00021032 <ME,IR,DR,RI>  CR: 28282222  XER: 20000000

GPR00: c00839f0 cf8dfeb0 cf8e0000 0000002f 00000001 c00938f4 c1425b76 0000002f 
GPR08: 00001032 00000000 00000001 00000004 28282828 00000000 00000000 b7927688 
GPR16: 00000000 bfe20a5c bfe20a58 0fe5fff8 10000b38 10002178 00000000 b7929c20 
GPR24: c095d81c 7c9319ee 00000000 00000000 b7929ae0 cf8e0000 00009032 c0d20000 
NIP [c00839f0] check_flags.part.25+0x1a0/0x1c4
LR [c00839f0] check_flags.part.25+0x1a0/0x1c4
Call Trace:
[cf8dfeb0] [c00839f0] check_flags.part.25+0x1a0/0x1c4 (unreliable)
[cf8dfec0] [c0085f6c] lock_is_held_type+0x78/0xb4
[cf8dfee0] [c095d35c] __schedule+0x6cc/0xb44
[cf8dff30] [c095d81c] schedule+0x48/0xb8
[cf8dff40] [c0014694] recheck+0x0/0x20
--- interrupt: 501 at 0xb78f2850
    LR = 0xb78f2a24
Instruction dump:
3c80c0b0 3c60c0af 3884d684 38635f94 4bfb3189 0fe00000 4bfffec8 3c80c0b0 
3c60c0af 3884d668 38635f94 4bfb316d <0fe00000> 4bfffefc 3c80c0b0 3c60c0af 
irq event stamp: 127630
hardirqs last  enabled at (127629): [<c09636f4>]
_raw_spin_unlock_irq+0x3c/0x94
hardirqs last disabled at (127630): [<c00140b4>] reenable_mmu+0x30/0x88
softirqs last  enabled at (127402): [<c0964614>] __do_softirq+0x42c/0x4a0
softirqs last disabled at (127393): [<c003cda4>] irq_exit+0x104/0x108
---[ end trace 4f6c84b7815474da ]---
possible reason: unannotated irqs-on.
irq event stamp: 127630
hardirqs last  enabled at (127629): [<c09636f4>] _raw_spin_unlock_irq+0x3c/0x94
hardirqs last disabled at (127630): [<c00140b4>] reenable_mmu+0x30/0x88
softirqs last  enabled at (127402): [<c0964614>] __do_softirq+0x42c/0x4a0
softirqs last disabled at (127393): [<c003cda4>] irq_exit+0x104/0x108

DEBUG_LOCKS_WARN_ON(!current->hardirqs_enabled)
WARNING: CPU: 0 PID: 1 at kernel/locking/lockdep.c:3762
check_flags.part.25+0x1a0/0x1c4
Modules linked in:
CPU: 0 PID: 1 Comm: init Not tainted 4.20.0-yocto-standard+ #1
NIP:  c00a53bc LR: c00a53bc CTR: 00000000
REGS: cf8e9df0 TRAP: 0700   Not tainted  (4.20.0-yocto-standard+)
MSR:  00021032 <ME,IR,DR,RI>  CR: 28028222  XER: 00000000

GPR00: c00a53bc cf8e9ea0 cf8e0000 0000002f 00000001 c00b6614 c149a08e 0f054000 
GPR08: 0f054000 00000000 00000001 00000004 28028822 00000000 00000000 b78c4200 
GPR16: 00000000 bfebc2d8 00000000 b78c2af0 0000000a cfd274a0 00000000 c09c343c 
GPR24: 00000000 c0d7ebdc b78c4200 00000000 c0d6faf2 cf8e0000 00009032 c0da0000 
NIP [c00a53bc] check_flags.part.25+0x1a0/0x1c4
LR [c00a53bc] check_flags.part.25+0x1a0/0x1c4
Call Trace:
[cf8e9ea0] [c00a53bc] check_flags.part.25+0x1a0/0x1c4 (unreliable)
[cf8e9eb0] [c00a7a80] lock_is_held_type+0x78/0xb4
[cf8e9ed0] [c09c2e50] __schedule+0x740/0xce4
[cf8e9f30] [c09c343c] schedule+0x48/0xb8
[cf8e9f40] [c0015698] recheck+0x0/0x20
--- interrupt: 901 at 0xb788cfe8
    LR = 0xb788cd44
Instruction dump:
3c80c0b7 3c60c0b6 38849aac 38631790 4bf955f5 0fe00000 4bfffec8 3c80c0b7 
3c60c0b6 38849a90 38631790 4bf955d9 <0fe00000> 4bfffefc 3c80c0b7 3c60c0b6 
irq event stamp: 131268
hardirqs last  enabled at (131266): [<c00d0c84>]
rcu_process_callbacks+0x594/0x770
hardirqs last disabled at (131267): [<c09caf7c>] __do_softirq+0x494/0x5e4
softirqs last  enabled at (131268): [<c09caff8>] __do_softirq+0x510/0x5e4
softirqs last disabled at (131255): [<c0042310>] irq_exit+0x128/0x12c
---[ end trace 0fd813db98ea17dc ]---
possible reason: unannotated irqs-on.
irq event stamp: 131268
hardirqs last  enabled at (131266): [<c00d0c84>]
rcu_process_callbacks+0x594/0x770
hardirqs last disabled at (131267): [<c09caf7c>] __do_softirq+0x494/0x5e4
softirqs last  enabled at (131268): [<c09caff8>] __do_softirq+0x510/0x5e4
softirqs last disabled at (131255): [<c0042310>] irq_exit+0x128/0x12c

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