possible deadlock in static_key_slow

possible deadlock in static_key_slow_dec
Status: upstream: reported C repro on 2018/11/07 01:38
Reported-by: syzbot+b011e55d1b4c015100d2@syzkaller.appspotmail.com
First crash: 474d, last: 4d16h

Cause bisection: introduced by (bisect log):

commit 7cd18c11799720bf077309be1b84b8395af1e2ff
Author: Stephen Rothwell <sfr@canb.auug.org.au>
Date: Wed Aug 14 04:46:44 2019 +0000

Merge remote-tracking branch 'tip/auto-latest'

Crash: possible deadlock in static_key_slow_dec (log)
Repro: C syz .config

similar bugs (1):
Kernel	Title	Repro	Bisected	Count	Last	Reported	Patched	Status
linux-4.19	possible deadlock in static_key_slow_dec			1	173d	173d	0/1	auto-closed as invalid on 2019/12/30 04:27

Sample crash report:

======================================================
WARNING: possible circular locking dependency detected
5.3.0-rc4-next-20190814 #66 Not tainted
------------------------------------------------------
syz-executor590/9351 is trying to acquire lock:
ffffffff88f5eef0 (cpu_hotplug_lock.rw_sem){++++}, at: __static_key_slow_dec kernel/jump_label.c:254 [inline]
ffffffff88f5eef0 (cpu_hotplug_lock.rw_sem){++++}, at: static_key_slow_dec+0x54/0xa0 kernel/jump_label.c:270

but task is already holding lock:
ffff8880a96354d0 (&mm->mmap_sem#2){++++}, at: vm_mmap_pgoff+0x173/0x230 mm/util.c:494

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #2 (&mm->mmap_sem#2){++++}:
       down_write+0x93/0x150 kernel/locking/rwsem.c:1534
       mpol_rebind_mm+0x25/0xd0 mm/mempolicy.c:382
       cpuset_attach+0x226/0x420 kernel/cgroup/cpuset.c:2204
       cgroup_migrate_execute+0xc56/0x1350 kernel/cgroup/cgroup.c:2524
       cgroup_migrate+0x14f/0x1f0 kernel/cgroup/cgroup.c:2780
       cgroup_attach_task+0x57f/0x860 kernel/cgroup/cgroup.c:2817
       __cgroup1_procs_write.constprop.0+0x321/0x400 kernel/cgroup/cgroup-v1.c:522
       cgroup1_procs_write+0x2b/0x40 kernel/cgroup/cgroup-v1.c:535
       cgroup_file_write+0x241/0x790 kernel/cgroup/cgroup.c:3754
       kernfs_fop_write+0x2b8/0x480 fs/kernfs/file.c:315
       __vfs_write+0x8a/0x110 fs/read_write.c:494
       vfs_write+0x268/0x5d0 fs/read_write.c:558
       ksys_write+0x14f/0x290 fs/read_write.c:611
       __do_sys_write fs/read_write.c:623 [inline]
       __se_sys_write fs/read_write.c:620 [inline]
       __x64_sys_write+0x73/0xb0 fs/read_write.c:620
       do_syscall_64+0xfa/0x760 arch/x86/entry/common.c:290
       entry_SYSCALL_64_after_hwframe+0x49/0xbe

-> #1 (&cpuset_rwsem){++++}:
       percpu_down_read include/linux/percpu-rwsem.h:40 [inline]
       cpuset_read_lock+0x3e/0x150 kernel/cgroup/cpuset.c:340
       __sched_setscheduler+0xca2/0x2110 kernel/sched/core.c:4718
       _sched_setscheduler+0x10a/0x1b0 kernel/sched/core.c:4890
       sched_setscheduler_nocheck+0xb/0x10 kernel/sched/core.c:4936
       __kthread_create_on_node+0x32a/0x460 kernel/kthread.c:349
       kthread_create_on_node+0xbb/0xf0 kernel/kthread.c:388
       create_worker+0x25c/0x570 kernel/workqueue.c:1929
       workqueue_prepare_cpu+0xa1/0x100 kernel/workqueue.c:4982
       cpuhp_invoke_callback+0x21a/0x1c60 kernel/cpu.c:172
       cpuhp_up_callbacks kernel/cpu.c:593 [inline]
       _cpu_up+0x289/0x550 kernel/cpu.c:1153
       do_cpu_up+0x171/0x190 kernel/cpu.c:1188
       cpu_up+0x1b/0x20 kernel/cpu.c:1196
       smp_init+0x248/0x261 kernel/smp.c:593
       kernel_init_freeable+0x339/0x5be init/main.c:1185
       kernel_init+0x12/0x1c5 init/main.c:1110
       ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352

-> #0 (cpu_hotplug_lock.rw_sem){++++}:
       check_prev_add kernel/locking/lockdep.c:2476 [inline]
       check_prevs_add kernel/locking/lockdep.c:2581 [inline]
       validate_chain kernel/locking/lockdep.c:2971 [inline]
       __lock_acquire+0x25b6/0x4e70 kernel/locking/lockdep.c:3955
       lock_acquire+0x190/0x410 kernel/locking/lockdep.c:4487
       percpu_down_read include/linux/percpu-rwsem.h:40 [inline]
       cpus_read_lock+0x3e/0x150 kernel/cpu.c:292
       __static_key_slow_dec kernel/jump_label.c:254 [inline]
       static_key_slow_dec+0x54/0xa0 kernel/jump_label.c:270
       sw_perf_event_destroy+0x8b/0x130 kernel/events/core.c:8482
       _free_event+0x354/0x13a0 kernel/events/core.c:4470
       put_event+0x47/0x60 kernel/events/core.c:4564
       perf_mmap_close+0x585/0xe00 kernel/events/core.c:5567
       remove_vma+0xb2/0x180 mm/mmap.c:183
       remove_vma_list mm/mmap.c:2615 [inline]
       __do_munmap+0x7b0/0x10f0 mm/mmap.c:2859
       do_munmap mm/mmap.c:2867 [inline]
       mmap_region+0x227/0x1760 mm/mmap.c:1745
       do_mmap+0x853/0x1180 mm/mmap.c:1575
       do_mmap_pgoff include/linux/mm.h:2395 [inline]
       vm_mmap_pgoff+0x1c5/0x230 mm/util.c:496
       ksys_mmap_pgoff+0x4aa/0x630 mm/mmap.c:1625
       __do_sys_mmap arch/x86/kernel/sys_x86_64.c:100 [inline]
       __se_sys_mmap arch/x86/kernel/sys_x86_64.c:91 [inline]
       __x64_sys_mmap+0xe9/0x1b0 arch/x86/kernel/sys_x86_64.c:91
       do_syscall_64+0xfa/0x760 arch/x86/entry/common.c:290
       entry_SYSCALL_64_after_hwframe+0x49/0xbe

other info that might help us debug this:

Chain exists of:
  cpu_hotplug_lock.rw_sem --> &cpuset_rwsem --> &mm->mmap_sem#2

 Possible unsafe locking scenario:

       CPU0                    CPU1
       ----                    ----
  lock(&mm->mmap_sem#2);
                               lock(&cpuset_rwsem);
                               lock(&mm->mmap_sem#2);
  lock(cpu_hotplug_lock.rw_sem);

 *** DEADLOCK ***

1 lock held by syz-executor590/9351:
 #0: ffff8880a96354d0 (&mm->mmap_sem#2){++++}, at: vm_mmap_pgoff+0x173/0x230 mm/util.c:494

stack backtrace:
CPU: 0 PID: 9351 Comm: syz-executor590 Not tainted 5.3.0-rc4-next-20190814 #66
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x172/0x1f0 lib/dump_stack.c:113
 print_circular_bug.isra.0.cold+0x163/0x172 kernel/locking/lockdep.c:1685
 check_noncircular+0x32e/0x3e0 kernel/locking/lockdep.c:1809
 check_prev_add kernel/locking/lockdep.c:2476 [inline]
 check_prevs_add kernel/locking/lockdep.c:2581 [inline]
 validate_chain kernel/locking/lockdep.c:2971 [inline]
 __lock_acquire+0x25b6/0x4e70 kernel/locking/lockdep.c:3955
 lock_acquire+0x190/0x410 kernel/locking/lockdep.c:4487
 percpu_down_read include/linux/percpu-rwsem.h:40 [inline]
 cpus_read_lock+0x3e/0x150 kernel/cpu.c:292
 __static_key_slow_dec kernel/jump_label.c:254 [inline]
 static_key_slow_dec+0x54/0xa0 kernel/jump_label.c:270
 sw_perf_event_destroy+0x8b/0x130 kernel/events/core.c:8482
 _free_event+0x354/0x13a0 kernel/events/core.c:4470
 put_event+0x47/0x60 kernel/events/core.c:4564
 perf_mmap_close+0x585/0xe00 kernel/events/core.c:5567
 remove_vma+0xb2/0x180 mm/mmap.c:183
 remove_vma_list mm/mmap.c:2615 [inline]
 __do_munmap+0x7b0/0x10f0 mm/mmap.c:2859
 do_munmap mm/mmap.c:2867 [inline]
 mmap_region+0x227/0x1760 mm/mmap.c:1745
 do_mmap+0x853/0x1180 mm/mmap.c:1575
 do_mmap_pgoff include/linux/mm.h:2395 [inline]
 vm_mmap_pgoff+0x1c5/0x230 mm/util.c:496
 ksys_mmap_pgoff+0x4aa/0x630 mm/mmap.c:1625
 __do_sys_mmap arch/x86/kernel/sys_x86_64.c:100 [inline]
 __se_sys_mmap arch/x86/kernel/sys_x86_64.c:91 [inline]
 __x64_sys_mmap+0xe9/0x1b0 arch/x86/kernel/sys_x86_64.c:91
 do_syscall_64+0xfa/0x760 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x4473b9
Code: e8 4c bb 02 00 48 83 c4 18 c3 0f 1f 80 00 00 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 5b 07 fc ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f148465bda8 EFLAGS: 00000246 ORIG_RAX: 0000000000000009
RAX: ffffffffffffffda RBX: 00000000006dcc38 RCX: 00000000004473b9
RDX: 0000000000000000 RSI: 0000000000003000 RDI: 0000000020ffd000
RBP: 00000000006dcc30 R08: 0000000000000004 R09: 0000000000000000
R10: 0000000000000011 R11: 0000000000000246 R12: 00000000006dcc3c
R13: 00007ffd3f4be3ef R14: 00007f148465c9c0 R15: 0000000000000000

Crashes (27):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	Syz repro	C repro	Maintainers
ci-upstream-linux-next-kasan-gce-root	2019/08/16 07:06	linux-next	17da61ae	8fd428a1	.config	log	report	syz	C	ard.biesheuvel@linaro.org, bp@suse.de, bristot@redhat.com, jakub.kicinski@netronome.com, linux-kernel@vger.kernel.org, mingo@kernel.org, peterz@infradead.org, simon.horman@netronome.com, tglx@linutronix.de, yamada.masahiro@socionext.com
ci-upstream-kasan-gce-selinux-root	2020/02/16 15:51	upstream	db70e26e	cf914200	.config	log	report			bristot@redhat.com, kuba@kernel.org, linux-kernel@vger.kernel.org, mingo@kernel.org, peterz@infradead.org, simon.horman@netronome.com
ci-upstream-kasan-gce-selinux-root	2020/01/30 01:56	upstream	b3a60822	5ed23f9a	.config	log	report			bristot@redhat.com, kuba@kernel.org, linux-kernel@vger.kernel.org, mingo@kernel.org, peterz@infradead.org, simon.horman@netronome.com
ci-upstream-kasan-gce-selinux-root	2019/12/20 15:33	upstream	7e0165b2	e30cbdae	.config	log	report			bristot@redhat.com, jakub.kicinski@netronome.com, linux-kernel@vger.kernel.org, mingo@kernel.org, peterz@infradead.org, simon.horman@netronome.com
ci-upstream-kasan-gce-selinux-root	2019/10/21 20:20	upstream	7d194c21	b24d2b8a	.config	log	report			bristot@redhat.com, jakub.kicinski@netronome.com, linux-kernel@vger.kernel.org, mingo@kernel.org, peterz@infradead.org, simon.horman@netronome.com, tglx@linutronix.de, yamada.masahiro@socionext.com
ci-upstream-kasan-gce	2019/10/17 21:26	upstream	283ea345	8c88c9c1	.config	log	report			andrew.murray@arm.com, bristot@redhat.com, jakub.kicinski@netronome.com, linux-kernel@vger.kernel.org, mingo@kernel.org, peterz@infradead.org, simon.horman@netronome.com, yamada.masahiro@socionext.com
ci-upstream-kasan-gce-selinux-root	2019/09/24 15:34	upstream	4c07e2dd	0942eab8	.config	log	report			ard.biesheuvel@linaro.org, bristot@redhat.com, jakub.kicinski@netronome.com, linux-kernel@vger.kernel.org, mingo@kernel.org, peterz@infradead.org, tglx@linutronix.de, yamada.masahiro@socionext.com
ci-upstream-kasan-gce	2019/09/21 13:53	upstream	f97c81dc	d96e88f3	.config	log	report			andrew.murray@arm.com, ard.biesheuvel@linaro.org, bristot@redhat.com, jakub.kicinski@netronome.com, linux-kernel@vger.kernel.org, mingo@kernel.org, peterz@infradead.org, tglx@linutronix.de, yamada.masahiro@socionext.com
ci-upstream-kasan-gce-selinux-root	2019/03/26 07:15	upstream	a3ac7917	55684ce1	.config	log	report			ard.biesheuvel@linaro.org, bp@suse.de, keescook@chromium.org, linux-kernel@vger.kernel.org, mingo@kernel.org, peterz@infradead.org, tglx@linutronix.de, yamada.masahiro@socionext.com
ci-upstream-kasan-gce-selinux-root	2019/03/25 19:48	upstream	8c2ffd91	2c86e0a5	.config	log	report			ard.biesheuvel@linaro.org, bp@suse.de, keescook@chromium.org, linux-kernel@vger.kernel.org, mingo@kernel.org, peterz@infradead.org, tglx@linutronix.de, yamada.masahiro@socionext.com
ci-upstream-kasan-gce-smack-root	2019/03/06 07:32	upstream	63bdf428	16559f86	.config	log	report			ard.biesheuvel@linaro.org, bp@suse.de, jpoimboe@redhat.com, keescook@chromium.org, linux-kernel@vger.kernel.org, mingo@kernel.org, peterz@infradead.org, tglx@linutronix.de, yamada.masahiro@socionext.com
ci-upstream-kasan-gce-smack-root	2019/01/11 18:43	upstream	de6629eb	c3f3344c	.config	log	report			ard.biesheuvel@linaro.org, bp@suse.de, jpoimboe@redhat.com, linux-kernel@vger.kernel.org, mingo@kernel.org, peterz@infradead.org, tglx@linutronix.de, yamada.masahiro@socionext.com
ci-upstream-kasan-gce-selinux-root	2019/01/06 11:46	upstream	b5aef86e	94f8adb5	.config	log	report			ard.biesheuvel@linaro.org, bp@suse.de, jpoimboe@redhat.com, linux-kernel@vger.kernel.org, mingo@kernel.org, peterz@infradead.org, tglx@linutronix.de
ci-upstream-kasan-gce-smack-root	2018/11/28 05:34	upstream	ef78e5ec	4b6d14f2	.config	log	report			ard.biesheuvel@linaro.org, bp@suse.de, jpoimboe@redhat.com, linux-kernel@vger.kernel.org, mingo@kernel.org, peterz@infradead.org, tglx@linutronix.de
ci-upstream-kasan-gce-root	2018/11/27 13:40	upstream	ef78e5ec	4b6d14f2	.config	log	report			ard.biesheuvel@linaro.org, bp@suse.de, jpoimboe@redhat.com, linux-kernel@vger.kernel.org, mingo@kernel.org, peterz@infradead.org, tglx@linutronix.de
ci-upstream-kasan-gce-selinux-root	2018/11/25 17:56	upstream	e195ca6c	3d3ec907	.config	log	report			ard.biesheuvel@linaro.org, bp@suse.de, jpoimboe@redhat.com, linux-kernel@vger.kernel.org, mingo@kernel.org, peterz@infradead.org, tglx@linutronix.de
ci-upstream-kasan-gce-root	2018/11/04 05:07	upstream	83650fd5	8bd6bd63	.config	log	report			ard.biesheuvel@linaro.org, bp@suse.de, jbaron@akamai.com, jpoimboe@redhat.com, linux-kernel@vger.kernel.org, mingo@kernel.org, peterz@infradead.org, tglx@linutronix.de
ci-upstream-kasan-gce-386	2020/01/24 13:39	upstream	4703d911	2e95ab33	.config	log	report			bristot@redhat.com, kuba@kernel.org, linux-kernel@vger.kernel.org, mingo@kernel.org, peterz@infradead.org, simon.horman@netronome.com
ci-upstream-linux-next-kasan-gce-root	2020/02/09 01:14	linux-next	6dff1565	06150bf1	.config	log	report			bristot@redhat.com, kuba@kernel.org, linux-kernel@vger.kernel.org, mingo@kernel.org, peterz@infradead.org, simon.horman@netronome.com
ci-upstream-linux-next-kasan-gce-root	2020/01/12 14:42	linux-next	6c09d7db	31290a45	.config	log	report			bristot@redhat.com, jakub.kicinski@netronome.com, linux-kernel@vger.kernel.org, mingo@kernel.org, peterz@infradead.org, simon.horman@netronome.com
ci-upstream-linux-next-kasan-gce-root	2019/11/24 12:19	linux-next	b9d3d014	598ca6c8	.config	log	report			andrew.murray@arm.com, bristot@redhat.com, jakub.kicinski@netronome.com, linux-kernel@vger.kernel.org, mingo@kernel.org, peterz@infradead.org, simon.horman@netronome.com, tglx@linutronix.de, yamada.masahiro@socionext.com
ci-upstream-linux-next-kasan-gce-root	2019/11/05 14:16	linux-next	51309b9d	0f3ec414	.config	log	report			andrew.murray@arm.com, bristot@redhat.com, jakub.kicinski@netronome.com, linux-kernel@vger.kernel.org, mingo@kernel.org, peterz@infradead.org, simon.horman@netronome.com, yamada.masahiro@socionext.com
ci-upstream-linux-next-kasan-gce-root	2019/10/05 11:40	linux-next	311ef88a	f3f7d9c8	.config	log	report			andrew.murray@arm.com, bristot@redhat.com, jakub.kicinski@netronome.com, linux-kernel@vger.kernel.org, mingo@kernel.org, peterz@infradead.org, simon.horman@netronome.com, yamada.masahiro@socionext.com
ci-upstream-linux-next-kasan-gce-root	2019/10/04 03:56	linux-next	2521ffab	fc17ba49	.config	log	report			andrew.murray@arm.com, bristot@redhat.com, jakub.kicinski@netronome.com, linux-kernel@vger.kernel.org, mingo@kernel.org, peterz@infradead.org, simon.horman@netronome.com, yamada.masahiro@socionext.com
ci-upstream-linux-next-kasan-gce-root	2019/08/16 06:36	linux-next	17da61ae	8fd428a1	.config	log	report			ard.biesheuvel@linaro.org, bp@suse.de, bristot@redhat.com, jakub.kicinski@netronome.com, linux-kernel@vger.kernel.org, mingo@kernel.org, peterz@infradead.org, tglx@linutronix.de, yamada.masahiro@socionext.com
ci-upstream-linux-next-kasan-gce-root	2019/02/02 03:08	linux-next	dc4c8999	564f9a4f	.config	log	report			ard.biesheuvel@linaro.org, bp@suse.de, jpoimboe@redhat.com, linux-kernel@vger.kernel.org, mingo@kernel.org, peterz@infradead.org, tglx@linutronix.de, yamada.masahiro@socionext.com
ci-upstream-linux-next-kasan-gce-root	2018/11/04 23:08	linux-next	25e9471b	8bd6bd63	.config	log	report			ard.biesheuvel@linaro.org, bp@suse.de, jbaron@akamai.com, jpoimboe@redhat.com, linux-kernel@vger.kernel.org, mingo@kernel.org, peterz@infradead.org, tglx@linutronix.de