The patch titled From: Konstantin Khlebnikov <khlebnikov@xxxxxxxxxx> has been added to the -mm tree. Its filename is sched-set-taint_unsafe_smp-after-sleep-in-atomic-bug.patch Before you just go and hit "reply", please: a) Consider who else should be cc'ed b) Prefer to cc a suitable mailing list as well c) Ideally: find the original patch on the mailing list and do a reply-to-all to that, adding suitable additional cc's *** Remember to use Documentation/SubmitChecklist when testing your code *** The -mm tree is included into linux-next and is updated there every 3-4 working days ------------------------------------------------------ From: Konstantin Khlebnikov <khlebnikov@xxxxxxxxxx> Subject: sched: set TAINT_UNSAFE_SMP after sleep-in-atomic bug Usually sleep-in-atomic bugs are followed by dozens other warnings. This patch should help to figure out original source of problem. This taint flag also turns off lockdep, because it can go mad after that. Original TAINT_UNSAFE_SMP is used only on various ancient buggy K7 Athlons. TAINT_UNSAFE_SMP is shown as 'S' in "Tainted" line, so let it be acronym for SMP, Scheduler and Sleep-in-atomic. Probably we should rename it into TAINT_SHIT, but TAINT_CRAP is already there. =) Signed-off-by: Konstantin Khlebnikov <khlebnikov@xxxxxxxxxx> Cc: Randy Dunlap <rdunlap@xxxxxxxxxxxx> Cc: Ingo Molnar <mingo@xxxxxxx> Cc: Peter Zijlstra <a.p.zijlstra@xxxxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- Documentation/oops-tracing.txt | 2 +- Documentation/sysctl/kernel.txt | 1 + kernel/sched/core.c | 1 + 3 files changed, 3 insertions(+), 1 deletion(-) diff -puN Documentation/oops-tracing.txt~sched-set-taint_unsafe_smp-after-sleep-in-atomic-bug Documentation/oops-tracing.txt --- a/Documentation/oops-tracing.txt~sched-set-taint_unsafe_smp-after-sleep-in-atomic-bug +++ a/Documentation/oops-tracing.txt @@ -237,7 +237,7 @@ characters, each representing a particul 3: 'S' if the oops occurred on an SMP kernel running on hardware that hasn't been certified as safe to run multiprocessor. Currently this occurs only on various Athlons that are not - SMP capable. + SMP capable. Also cpu scheduler sets this after sleep-in-atomic bug. 4: 'R' if a module was force unloaded by "rmmod -f", ' ' if all modules were unloaded normally. diff -puN Documentation/sysctl/kernel.txt~sched-set-taint_unsafe_smp-after-sleep-in-atomic-bug Documentation/sysctl/kernel.txt --- a/Documentation/sysctl/kernel.txt~sched-set-taint_unsafe_smp-after-sleep-in-atomic-bug +++ a/Documentation/sysctl/kernel.txt @@ -590,6 +590,7 @@ can be ORed together: 2 - A module was force loaded by insmod -f. Set by modutils >= 2.4.9 and module-init-tools. 4 - Unsafe SMP processors: SMP with CPUs not designed for SMP. + Also cpu scheduler sets this after sleep-in-atomic bug. 8 - A module was forcibly unloaded from the system by rmmod -f. 16 - A hardware machine check error occurred on the system. 32 - A bad page was discovered on the system. diff -puN kernel/sched/core.c~sched-set-taint_unsafe_smp-after-sleep-in-atomic-bug kernel/sched/core.c --- a/kernel/sched/core.c~sched-set-taint_unsafe_smp-after-sleep-in-atomic-bug +++ a/kernel/sched/core.c @@ -3133,6 +3133,7 @@ static noinline void __schedule_bug(stru if (irqs_disabled()) print_irqtrace_events(prev); dump_stack(); + add_taint(TAINT_UNSAFE_SMP); } /* _ Subject: From: Konstantin Khlebnikov <khlebnikov@xxxxxxxxxx> Patches currently in -mm which might be from khlebnikov@xxxxxxxxxx are linux-next.patch fs-proc-fix-abba-deadlock-in-case-of-execution-attempt-of-map_files-entries.patch mm-remove-swap-token-code.patch mm-vmscan-remove-lumpy-reclaim.patch mm-vmscan-do-not-stall-on-writeback-during-memory-compaction.patch mm-vmscan-remove-reclaim_mode_t.patch mm-correctly-synchronize-rss-counters-at-exit-exec.patch kernel-cgroup-push-rcu-read-locking-from-css_is_ancestor-to-callsite.patch mm-memcg-count-pte-references-from-every-member-of-the-reclaimed-hierarchy.patch mm-memcg-count-pte-references-from-every-member-of-the-reclaimed-hierarchy-fix.patch bug-introduce-build_bug_on_invalid-macro.patch bug-completely-remove-code-generated-by-disabled-vm_bug_on.patch mm-memcg-scanning_global_lru-means-mem_cgroup_disabled.patch mm-memcg-move-reclaim_stat-into-lruvec.patch mm-push-lru-index-into-shrink_active_list.patch mm-push-lru-index-into-shrink_active_list-fix.patch mm-mark-mm-inline-functions-as-__always_inline.patch mm-remove-lru-type-checks-from-__isolate_lru_page.patch mm-memcg-kill-mem_cgroup_lru_del.patch mm-memcg-use-vm_swappiness-from-target-memory-cgroup.patch mm-vmscan-store-priority-in-struct-scan_control.patch mm-add-link-from-struct-lruvec-to-struct-zone.patch mm-vmscan-push-lruvec-pointer-into-isolate_lru_pages.patch mm-vmscan-push-zone-pointer-into-shrink_page_list.patch mm-vmscan-remove-update_isolated_counts.patch mm-vmscan-push-lruvec-pointer-into-putback_inactive_pages.patch mm-vmscan-replace-zone_nr_lru_pages-with-get_lruvec_size.patch mm-vmscan-push-lruvec-pointer-into-inactive_list_is_low.patch mm-vmscan-push-lruvec-pointer-into-shrink_list.patch mm-vmscan-push-lruvec-pointer-into-get_scan_count.patch mm-vmscan-push-lruvec-pointer-into-should_continue_reclaim.patch mm-vmscan-kill-struct-mem_cgroup_zone.patch mm-memcg-get_lru_size-not-get_lruvec_size.patch mm-trivial-cleanups-in-vmscanc.patch mm-memcg-apply-add-del_page-to-lruvec.patch sched-set-taint_unsafe_smp-after-sleep-in-atomic-bug.patch proc-report-file-anon-bit-in-proc-pid-pagemap.patch proc-smaps-carefully-handle-migration-entries.patch proc-smaps-show-amount-of-nonlinear-ptes-in-vma.patch proc-smaps-show-amount-of-hwpoison-pages.patch fork-call-complete_vfork_done-after-clearing-child_tid-and-flushing-rss-counters.patch c-r-prctl-add-ability-to-set-new-mm_struct-exe_file-update-after-mm-num_exe_file_vmas-removal.patch -- To unsubscribe from this list: send the line "unsubscribe mm-commits" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html