Fwd: [CRON] Broken: ClangBuiltLinux/continuous-integration#895 (master - 2a3984b)

Nick Desaulniers
2019-08-09T21:21:35Z

Did anyone report any issue with last night's -next for arm64?

Some kind of deadlock in online_fair_sched_group.

[ 15.256790] ================================
[ 15.257025] WARNING: inconsistent lock state
[ 15.257243] 5.3.0-rc3-next-20190809 #1 Not tainted
[ 15.257393] --------------------------------
[ 15.257526] inconsistent {IN-HARDIRQ-W} -> {HARDIRQ-ON-W} usage.
[ 15.258096] init/1 [HC0[0]:SC0[0]:HE1:SE1] takes:
[ 15.258522] (____ptrval____) (&rq->lock){?.-.}, at:
online_fair_sched_group+0x78/0xe4
[ 15.259170] {IN-HARDIRQ-W} state was registered at:
[ 15.259658] lock_acquire+0x1dc/0x228
[ 15.259940] _raw_spin_lock+0x40/0x54
[ 15.260251] scheduler_tick+0x50/0xfc
[ 15.260491] update_process_times+0x80/0x98
[ 15.260677] tick_periodic+0xd8/0xf0
[ 15.260910] tick_handle_periodic+0x30/0x94
[ 15.261126] arch_timer_handler_virt+0x34/0x40
[ 15.261332] handle_percpu_devid_irq+0x1a8/0x3c4
[ 15.261495] __handle_domain_irq+0x7c/0xbc
[ 15.261689] gic_handle_irq+0x48/0xac
[ 15.261881] el1_irq+0xbc/0x180
[ 15.262024] _raw_spin_unlock_irqrestore+0x4c/0x80
[ 15.262263] tty_register_ldisc+0x58/0x6c
[ 15.262430] n_tty_init+0x18/0x20
[ 15.262615] console_init+0x20/0x3e4
[ 15.262820] start_kernel+0x248/0x3c4
[ 15.263079] irq event stamp: 220201
[ 15.263362] hardirqs last enabled at (220201):
[<ffff000010e1f334>] _raw_spin_unlock_irqrestore+0x48/0x80
[ 15.263731] hardirqs last disabled at (220200):
[<ffff000010e1f190>] _raw_spin_lock_irqsave+0x30/0x7c
[ 15.264046] softirqs last enabled at (220196):
[<ffff0000100f84c0>] irq_exit+0x114/0x134
[ 15.264419] softirqs last disabled at (220185):
[<ffff0000100f84c0>] irq_exit+0x114/0x134
[ 15.264751]
[ 15.264751] other info that might help us debug this:
[ 15.265044] Possible unsafe locking scenario:
[ 15.265044]
[ 15.265256] CPU0
[ 15.265458] ----
[ 15.265615] lock(&rq->lock);
[ 15.265898] <Interrupt>
[ 15.266087] lock(&rq->lock);
[ 15.266353]
[ 15.266353] *** DEADLOCK ***
[ 15.266353]
[ 15.266574] no locks held by init/1.
[ 15.266784]
[ 15.266784] stack backtrace:
[ 15.267120] CPU: 0 PID: 1 Comm: init Not tainted 5.3.0-rc3-next-20190809 #1
[ 15.267341] Hardware name: linux,dummy-virt (DT)
[ 15.267756] Call trace:
[ 15.267928] dump_backtrace+0x0/0x140
[ 15.268159] show_stack+0x14/0x1c
[ 15.268341] dump_stack+0xa8/0x104
[ 15.268482] mark_lock+0xda0/0xda8
[ 15.268728] __lock_acquire+0x300/0x858
[ 15.268869] lock_acquire+0x1dc/0x228
[ 15.269057] _raw_spin_lock+0x40/0x54
[ 15.269201] online_fair_sched_group+0x78/0xe4
[ 15.269392] sched_online_group+0x88/0xac
[ 15.269591] sched_autogroup_create_attach+0xcc/0x12c
[ 15.269765] ksys_setsid+0xe8/0xec
[ 15.269990] __arm64_sys_setsid+0xc/0x18
[ 15.270178] el0_svc_common+0x9c/0x15c
[ 15.270317] el0_svc_handler+0x5c/0x64
[ 15.270493] el0_svc+0x8/0xc

https://travis-ci.com/ClangBuiltLinux/continuous-integration/jobs/223856448

Guessing related to
commit 6b8fd01b21f5 ("sched/fair: Use rq_lock/unlock in
online_fair_sched_group")

---------- Forwarded message ---------
From: Travis CI <builds@travis-ci.com>
Date: Fri, Aug 9, 2019 at 6:13 AM
Subject: [CRON] Broken: ClangBuiltLinux/continuous-integration#895
(master - 2a3984b)
To: <ndesaulniers@google.com>, <natechancellor@gmail.com>

ClangBuiltLinux / continuous-integration

master

Build #895 was broken
3 hrs, 29 mins, and 39 secs
Nathan Chancellor
2a3984b CHANGESET →

Merge pull request #196 from nathanchance/ppc64

PPC64 big endian
--
Thanks,
~Nick Desaulniers