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Groups > linux.kernel > #1462253
| From | Ben Hutchings <ben@decadent.org.uk> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | [PATCH 3.2 52/94] kernel/sysrq, watchdog, sched/core: Reset watchdog on all CPUs while processing sysrq-w |
| Date | 2016-08-14 20:10 +0200 |
| Message-ID | <s681d-31c-87@gated-at.bofh.it> (permalink) |
| References | <s5LnX-4sk-7@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
3.2.82-rc1 review patch. If anyone has any objections, please let me know. ------------------ From: Andrey Ryabinin <aryabinin@virtuozzo.com> commit 57675cb976eff977aefb428e68e4e0236d48a9ff upstream. Lengthy output of sysrq-w may take a lot of time on slow serial console. Currently we reset NMI-watchdog on the current CPU to avoid spurious lockup messages. Sometimes this doesn't work since softlockup watchdog might trigger on another CPU which is waiting for an IPI to proceed. We reset softlockup watchdogs on all CPUs, but we do this only after listing all tasks, and this may be too late on a busy system. So, reset watchdogs CPUs earlier, in for_each_process_thread() loop. Signed-off-by: Andrey Ryabinin <aryabinin@virtuozzo.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Link: http://lkml.kernel.org/r/1465474805-14641-1-git-send-email-aryabinin@virtuozzo.com Signed-off-by: Ingo Molnar <mingo@kernel.org> [bwh: Backported to 3.2: adjust filename, context] Signed-off-by: Ben Hutchings <ben@decadent.org.uk> --- kernel/sched.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) --- a/kernel/sched.c +++ b/kernel/sched.c @@ -6260,14 +6260,16 @@ void show_state_filter(unsigned long sta /* * reset the NMI-timeout, listing all files on a slow * console might take a lot of time: + * Also, reset softlockup watchdogs on all CPUs, because + * another CPU might be blocked waiting for us to process + * an IPI. */ touch_nmi_watchdog(); + touch_all_softlockup_watchdogs(); if (!state_filter || (p->state & state_filter)) sched_show_task(p); } while_each_thread(g, p); - touch_all_softlockup_watchdogs(); - #ifdef CONFIG_SCHED_DEBUG sysrq_sched_debug_show(); #endif
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[PATCH 3.2 00/94] 3.2.82-rc1 review Ben Hutchings <ben@decadent.org.uk> - 2016-08-14 13:50 +0200 [PATCH 3.2 26/94] fs/cifs: correctly to anonymous authentication for the LANMAN authentication Ben Hutchings <ben@decadent.org.uk> - 2016-08-14 13:50 +0200 [PATCH 3.2 23/94] x86/PCI: Mark Broadwell-EP Home Agent 1 as having non-compliant BARs Ben Hutchings <ben@decadent.org.uk> - 2016-08-14 13:50 +0200 [PATCH 3.2 93/94] tcp: make challenge acks less predictable Ben Hutchings <ben@decadent.org.uk> - 2016-08-14 13:50 +0200 [PATCH 3.2 62/94] UBIFS: Implement ->migratepage() Ben Hutchings <ben@decadent.org.uk> - 2016-08-14 14:00 +0200 [PATCH 3.2 42/94] x86, build: copy ldlinux.c32 to image.iso Ben Hutchings <ben@decadent.org.uk> - 2016-08-14 14:00 +0200 [PATCH 3.2 54/94] kvm: Fix irq route entries exceeding KVM_MAX_IRQ_ROUTES Ben Hutchings <ben@decadent.org.uk> - 2016-08-14 14:00 +0200 [PATCH 3.2 13/94] USB: serial: option: add even more ZTE device ids Ben Hutchings <ben@decadent.org.uk> - 2016-08-14 14:00 +0200 [PATCH 3.2 35/94] Input: xpad - prevent spurious input from wired Xbox 360 controllers Ben Hutchings <ben@decadent.org.uk> - 2016-08-14 14:00 +0200 [PATCH 3.2 43/94] fix d_walk()/non-delayed __d_free() race Ben Hutchings <ben@decadent.org.uk> - 2016-08-14 14:00 +0200 [PATCH 3.2 18/94] powerpc/mm/hash64: Factor out hash preload psize check Ben Hutchings <ben@decadent.org.uk> - 2016-08-14 14:00 +0200 [PATCH 3.2 86/94] proc: prevent stacking filesystems on top Ben Hutchings <ben@decadent.org.uk> - 2016-08-14 14:10 +0200 [PATCH 3.2 34/94] RDMA/cxgb3: device driver frees DMA memory with different size Ben Hutchings <ben@decadent.org.uk> - 2016-08-14 14:10 +0200 [PATCH 3.2 22/94] net/mlx4_core: Fix access to uninitialized index Ben Hutchings <ben@decadent.org.uk> - 2016-08-14 14:10 +0200 [PATCH 3.2 82/94] xenbus: don't BUG() on user mode induced condition Ben Hutchings <ben@decadent.org.uk> - 2016-08-14 14:10 +0200 [PATCH 3.2 69/94] ALSA: dummy: Fix a use-after-free at closing Ben Hutchings <ben@decadent.org.uk> - 2016-08-14 14:10 +0200 [PATCH 3.2 74/94] NFS: Fix another OPEN_DOWNGRADE bug Ben Hutchings <ben@decadent.org.uk> - 2016-08-14 14:10 +0200 [PATCH 3.2 73/94] ALSA: echoaudio: Fix memory allocation Ben Hutchings <ben@decadent.org.uk> - 2016-08-14 14:10 +0200 [PATCH 3.2 61/94] mm: Export migrate_page_move_mapping and migrate_page_copy Ben Hutchings <ben@decadent.org.uk> - 2016-08-14 14:10 +0200 [PATCH 3.2 02/94] ath5k: Change led pin configuration for compaq c700 laptop Ben Hutchings <ben@decadent.org.uk> - 2016-08-14 14:10 +0200 Re: [PATCH 3.2 00/94] 3.2.82-rc1 review Guenter Roeck <linux@roeck-us.net> - 2016-08-14 17:10 +0200 [PATCH 3.2 39/94] ARM: fix PTRACE_SETVFPREGS on SMP systems Ben Hutchings <ben@decadent.org.uk> - 2016-08-14 20:00 +0200 [PATCH 3.2 85/94] fs: limit filesystem stacking depth Ben Hutchings <ben@decadent.org.uk> - 2016-08-14 20:00 +0200 [PATCH 3.2 11/94] tty: vt, return error when con_startup fails Ben Hutchings <ben@decadent.org.uk> - 2016-08-14 20:00 +0200 [PATCH 3.2 91/94] tipc: fix an infoleak in tipc_nl_compat_link_dump Ben Hutchings <ben@decadent.org.uk> - 2016-08-14 20:00 +0200 [PATCH 3.2 15/94] MIPS: Adjust set_pte() SMP fix to handle R10000_LLSC_WAR Ben Hutchings <ben@decadent.org.uk> - 2016-08-14 20:00 +0200 [PATCH 3.2 60/94] ubi: Make recover_peb power cut aware Ben Hutchings <ben@decadent.org.uk> - 2016-08-14 20:00 +0200 [PATCH 3.2 03/94] crypto: s5p-sss - Fix missed interrupts when working with 8 kB blocks Ben Hutchings <ben@decadent.org.uk> - 2016-08-14 20:00 +0200 [PATCH 3.2 64/94] xen/pciback: Fix conf_space read/write overlap check. Ben Hutchings <ben@decadent.org.uk> - 2016-08-14 20:00 +0200 [PATCH 3.2 25/94] fs/cifs: correctly to anonymous authentication via NTLMSSP Ben Hutchings <ben@decadent.org.uk> - 2016-08-14 20:00 +0200 [PATCH 3.2 37/94] Input: pwm-beeper - fix - scheduling while atomic Ben Hutchings <ben@decadent.org.uk> - 2016-08-14 20:10 +0200 [PATCH 3.2 21/94] mmc: mmc: Fix partition switch timeout for some eMMCs Ben Hutchings <ben@decadent.org.uk> - 2016-08-14 20:10 +0200 [PATCH 3.2 88/94] ALSA: timer: Fix leak in SNDRV_TIMER_IOCTL_PARAMS Ben Hutchings <ben@decadent.org.uk> - 2016-08-14 20:10 +0200 [PATCH 3.2 01/94] regmap: cache: Fix typo in cache_bypass parameter description Ben Hutchings <ben@decadent.org.uk> - 2016-08-14 20:10 +0200 [PATCH 3.2 63/94] can: fix oops caused by wrong rtnl dellink usage Ben Hutchings <ben@decadent.org.uk> - 2016-08-14 20:10 +0200 [PATCH 3.2 77/94] x86/amd_nb: Fix boot crash on non-AMD systems Ben Hutchings <ben@decadent.org.uk> - 2016-08-14 20:10 +0200 [PATCH 3.2 79/94] bonding: prevent out of bound accesses Ben Hutchings <ben@decadent.org.uk> - 2016-08-14 20:10 +0200 [PATCH 3.2 06/94] crypto: s5p-sss - fix incorrect usage of scatterlists api Ben Hutchings <ben@decadent.org.uk> - 2016-08-14 20:10 +0200 [PATCH 3.2 59/94] can: at91_can: RX queue could get stuck at high bus load Ben Hutchings <ben@decadent.org.uk> - 2016-08-14 20:10 +0200 [PATCH 3.2 70/94] fs/nilfs2: fix potential underflow in call to crc32_le Ben Hutchings <ben@decadent.org.uk> - 2016-08-14 20:10 +0200 [PATCH 3.2 71/94] staging: iio: accel: fix error check Ben Hutchings <ben@decadent.org.uk> - 2016-08-14 20:10 +0200 [PATCH 3.2 84/94] cifs: dynamic allocation of ntlmssp blob Ben Hutchings <ben@decadent.org.uk> - 2016-08-14 20:10 +0200 [PATCH 3.2 52/94] kernel/sysrq, watchdog, sched/core: Reset watchdog on all CPUs while processing sysrq-w Ben Hutchings <ben@decadent.org.uk> - 2016-08-14 20:10 +0200 [PATCH 3.2 40/94] KVM: x86: fix OOPS after invalid KVM_SET_DEBUGREGS Ben Hutchings <ben@decadent.org.uk> - 2016-08-14 20:10 +0200 [PATCH 3.2 53/94] base: make module_create_drivers_dir race-free Ben Hutchings <ben@decadent.org.uk> - 2016-08-14 20:10 +0200 [PATCH 3.2 87/94] USB: usbfs: fix potential infoleak in devio Ben Hutchings <ben@decadent.org.uk> - 2016-08-14 20:20 +0200 [PATCH 3.2 48/94] staging:iio: trigger fixes for repeat request of same trigger and allocation failure Ben Hutchings <ben@decadent.org.uk> - 2016-08-14 20:20 +0200 [PATCH 3.2 09/94] ext4: fix hang when processing corrupted orphaned inode list Ben Hutchings <ben@decadent.org.uk> - 2016-08-14 20:20 +0200 [PATCH 3.2 75/94] batman-adv: Fix use-after-free/double-free of tt_req_node Ben Hutchings <ben@decadent.org.uk> - 2016-08-14 20:20 +0200
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