[ note: this patch is in a dev branch for test coverage, safe to disregard for now ] On Wed, Jul 22, 2015 at 4:32 PM, kernel test robot <fengguang.wu@xxxxxxxxx> wrote: > Greetings, > > 0day kernel testing robot got the below dmesg and the first bad commit is > > git://git.kernel.org/pub/scm/linux/kernel/git/djbw/nvdimm.git pmem-api > > commit 163f9409a57082aed03fbeeb321fbf18bdaf5f42 > Author: Dan Williams <dan.j.williams@xxxxxxxxx> > AuthorDate: Wed Jul 22 18:09:01 2015 -0400 > Commit: Dan Williams <dan.j.williams@xxxxxxxxx> > CommitDate: Wed Jul 22 18:09:01 2015 -0400 > > arch: introduce memremap(), replace ioremap_cache() > > Existing users of ioremap_cache() are mapping memory that is known in > advance to not have i/o side effects. These users are forced to cast > away the __iomem annotation, or otherwise neglect to fix the sparse > errors thrown when dereferencing pointers to this memory. Provide > memremap() as a non __iomem annotated ioremap_*() in the case when > ioremap is otherwise a pointer to memory. > > The ARCH_HAS_MEMREMAP kconfig symbol is introduced for archs to assert > that it is safe to recast / reuse the return value from ioremap as a > normal pointer to memory. In other words, archs that mandate specific > accessors for __iomem are not memremap() capable and drivers that care, > like pmem, can add a dependency to disable themselves on these archs. > > Note, that memremap is a break from the ioremap implementation pattern > of adding a new memremap_<type>() for each mapping type. Instead, > the implementation defines flags that are passed to the central > memremap() implementation. > > Outside of ioremap() and ioremap_nocache(), the expectation is that most > calls to ioremap_<type>() are seeking memory-like semantics (e.g. > speculative reads, and prefetching permitted). These callsites can be > moved to memremap() over time. > > Cc: Arnd Bergmann <arnd@xxxxxxxx> > Acked-by: Andy Shevchenko <andy.shevchenko@xxxxxxxxx> > Signed-off-by: Dan Williams <dan.j.williams@xxxxxxxxx> > > +------------------------------------------------+------------+------------+------------+ > | | dc5d38e432 | 163f9409a5 | 5dfe2d5864 | > +------------------------------------------------+------------+------------+------------+ > | boot_successes | 63 | 0 | 0 | > | boot_failures | 0 | 26 | 19 | > | WARNING:at_kernel/memremap.c:#memremap() | 0 | 26 | 19 | > | backtrace:acpi_load_tables | 0 | 26 | 19 | > | backtrace:acpi_early_init | 0 | 26 | 19 | > | IP-Config:Auto-configuration_of_network_failed | 0 | 0 | 2 | > +------------------------------------------------+------------+------------+------------+ > > [ 0.227312] ACPI: Core revision 20150619 > [ 0.227690] memremap: acpi_os_map_iomem > [ 0.228021] ------------[ cut here ]------------ > [ 0.228406] WARNING: CPU: 0 PID: 0 at kernel/memremap.c:31 memremap+0x73/0x159() > [ 0.229202] memremap attempted on unknown/mixed range 0x000000000ffe0000 size: 4096 > [ 0.229829] Modules linked in: > [ 0.230106] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 4.2.0-rc3-00007-g163f940 #1 > [ 0.230718] 00000000 00000000 c175bf04 c1489068 c175bf30 c175bf20 c103a1ae 0000001f > [ 0.231456] c10f6407 00001000 00000001 00000001 c175bf38 c103a1f0 00000009 c175bf30 > [ 0.232242] c16b3ecb c175bf4c c175bf68 c10f6407 c16b3f04 0000001f c16b3ecb c175bf54 > [ 0.232985] Call Trace: > [ 0.233196] [<c1489068>] dump_stack+0x48/0x60 > [ 0.233570] [<c103a1ae>] warn_slowpath_common+0x89/0xa0 > [ 0.234016] [<c10f6407>] ? memremap+0x73/0x159 > [ 0.234396] [<c103a1f0>] warn_slowpath_fmt+0x2b/0x2f > [ 0.234816] [<c10f6407>] memremap+0x73/0x159 > [ 0.235190] [<c1486181>] acpi_os_map_iomem+0x10b/0x15f > [ 0.235660] [<c14861e2>] acpi_os_map_memory+0xd/0xf > [ 0.236089] [<c1293d5c>] acpi_tb_acquire_table+0x35/0x5a > [ 0.236538] [<c1293e41>] acpi_tb_validate_table+0x22/0x37 > [ 0.237001] [<c1841255>] acpi_load_tables+0x38/0x146 > [ 0.237424] [<c184080e>] acpi_early_init+0x64/0xd4 > [ 0.237830] [<c1817b14>] start_kernel+0x3e1/0x447 > [ 0.238232] [<c18172bb>] i386_start_kernel+0x85/0x89 > [ 0.238734] ---[ end trace cb88537fdc8fa200 ]--- > [ 0.239133] ACPI Exception: AE_NO_ACPI_TABLES, While loading namespace from ACPI tables (20150619/tbxfload-80) > > git bisect start 5dfe2d5864e91244e7befaa2317519ea15dc9c89 52721d9d3334c1cb1f76219a161084094ec634dc -- > git bisect good cfc652fabeee43adf800889a5a4a935a9af090a7 # 07:04 20+ 0 arch, drivers: don't include <asm/io.h> directly, use <linux/io.h> instead > git bisect good dc5d38e432ff171125f746d80a037692feb16fc9 # 07:11 22+ 0 intel_iommu: fix leaked ioremap mapping > git bisect bad 163f9409a57082aed03fbeeb321fbf18bdaf5f42 # 07:17 0- 22 arch: introduce memremap(), replace ioremap_cache() > # first bad commit: [163f9409a57082aed03fbeeb321fbf18bdaf5f42] arch: introduce memremap(), replace ioremap_cache() > git bisect good dc5d38e432ff171125f746d80a037692feb16fc9 # 07:19 63+ 0 intel_iommu: fix leaked ioremap mapping > # extra tests with DEBUG_INFO > git bisect bad 163f9409a57082aed03fbeeb321fbf18bdaf5f42 # 07:24 0- 29 arch: introduce memremap(), replace ioremap_cache() > # extra tests on HEAD of nvdimm/pmem-api > git bisect bad 5dfe2d5864e91244e7befaa2317519ea15dc9c89 # 07:24 0- 19 pmem: convert to generic memremap > # extra tests on tree/branch nvdimm/pmem-api > git bisect bad 5dfe2d5864e91244e7befaa2317519ea15dc9c89 # 07:24 0- 19 pmem: convert to generic memremap > # extra tests on tree/branch linus/master > git bisect good 5a5ca73ac0a73c876b62858f0753a25ee430e370 # 07:26 66+ 2 Merge tag 'arm64-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux > # extra tests on tree/branch linux-next/master > git bisect good 72a68fd733c8b6cd2e0ebc0586a9103067cd4ed7 # 07:29 65+ 0 Add linux-next specific files for 20150722 > > > This script may reproduce the error. > > ---------------------------------------------------------------------------- > #!/bin/bash > > kernel=$1 > initrd=yocto-minimal-i386.cgz > > wget --no-clobber https://github.com/fengguang/reproduce-kernel-bug/raw/master/initrd/$initrd > > kvm=( > qemu-system-x86_64 > -enable-kvm > -cpu Haswell,+smep,+smap > -kernel $kernel > -initrd $initrd > -m 256 > -smp 1 > -device e1000,netdev=net0 > -netdev user,id=net0 > -boot order=nc > -no-reboot > -watchdog i6300esb > -rtc base=localtime > -serial stdio > -display none > -monitor null > ) > > append=( > hung_task_panic=1 > earlyprintk=ttyS0,115200 > systemd.log_level=err > debug > apic=debug > sysrq_always_enabled > rcupdate.rcu_cpu_stall_timeout=100 > panic=-1 > softlockup_panic=1 > nmi_watchdog=panic > oops=panic > load_ramdisk=2 > prompt_ramdisk=0 > console=ttyS0,115200 > console=tty0 > vga=normal > root=/dev/ram0 > rw > drbd.minor_count=8 > ) > > "${kvm[@]}" --append "${append[*]}" > ---------------------------------------------------------------------------- > > --- > 0-DAY kernel test infrastructure Open Source Technology Center > https://lists.01.org/pipermail/lkp Intel Corporation -- To unsubscribe from this list: send the line "unsubscribe linux-acpi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
