WARNING in arch_install_hw

WARNING in arch_install_hw_breakpoint
Status: public: reported syz repro on 2019/04/14 09:28
Reported-by: syzbot+acfd3de78bec50ddcbf9@syzkaller.appspotmail.com
First crash: 147d, last: 30d

similar bugs (3):
Kernel	Title	Repro	Bisected	Count	Last	Reported	Patched	Status
android-414	WARNING in arch_install_hw_breakpoint	syz		2	147d	127d	0/1	public: reported syz repro on 2019/04/13 00:01
upstream	WARNING in arch_install_hw_breakpoint	C	cause	8	30d	146d	0/13	upstream: reported C repro on 2019/03/24 06:22
linux-4.14	WARNING in arch_install_hw_breakpoint	syz		1	30d	30d	0/1	upstream: reported syz repro on 2019/07/19 00:15

Sample crash report:

audit: type=1400 audit(1553340375.890:5): avc:  denied  { associate } for  pid=2112 comm="syz-executor.4" name="syz4" scontext=unconfined_u:object_r:unlabeled_t:s0 tcontext=system_u:object_r:unlabeled_t:s0 tclass=filesystem permissive=1
------------[ cut here ]------------
WARNING: CPU: 0 PID: 3019 at arch/x86/kernel/hw_breakpoint.c:121 arch_install_hw_breakpoint+0xbe/0x300 arch/x86/kernel/hw_breakpoint.c:121
Can't find any breakpoint slot[  188.151986] Kernel panic - not syncing: panic_on_warn set ...

CPU: 0 PID: 3019 Comm: syz-executor.3 Not tainted 4.9.164+ #24
 ffff8801cc1ef590 ffffffff81b484d1 ffff8801cc1ef600 ffffffff82a39c20
 00000000ffffffff 0000000000000000 0000000000000009 ffff8801cc1ef670
 ffffffff813f7eea 0000000041b58ab3 ffffffff82e2e282 ffffffff813f7d11
Call Trace:
 [<ffffffff81b484d1>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81b484d1>] dump_stack+0xc1/0x120 lib/dump_stack.c:51
 [<ffffffff813f7eea>] panic+0x1d9/0x3bd kernel/panic.c:180
 [<ffffffff813f812b>] __warn.cold+0x2f/0x2f kernel/panic.c:546
 [<ffffffff810dae12>] warn_slowpath_fmt+0xc2/0x100 kernel/panic.c:569
 [<ffffffff8106341e>] arch_install_hw_breakpoint+0xbe/0x300 arch/x86/kernel/hw_breakpoint.c:121
 [<ffffffff813ee3c0>] hw_breakpoint_add+0x90/0x120 kernel/events/hw_breakpoint.c:574
 [<ffffffff813d1de1>] event_sched_in.isra.0+0x291/0x920 kernel/events/core.c:2098
 [<ffffffff813d2583>] group_sched_in+0x113/0x460 kernel/events/core.c:2138
 [<ffffffff813d2e1d>] ctx_flexible_sched_in kernel/events/core.c:3079 [inline]
 [<ffffffff813d2e1d>] ctx_sched_in.isra.0+0x54d/0xb20 kernel/events/core.c:3125
 [<ffffffff813d344d>] perf_event_sched_in.isra.0+0x5d/0x90 kernel/events/core.c:2265
 [<ffffffff813d4b31>] perf_event_context_sched_in kernel/events/core.c:3154 [inline]
 [<ffffffff813d4b31>] __perf_event_task_sched_in+0x361/0x4a0 kernel/events/core.c:3191
 [<ffffffff8116698c>] perf_event_task_sched_in include/linux/perf_event.h:1086 [inline]
 [<ffffffff8116698c>] finish_task_switch+0x21c/0x660 kernel/sched/core.c:2820
 [<ffffffff827f7bee>] context_switch kernel/sched/core.c:2954 [inline]
 [<ffffffff827f7bee>] __schedule+0x65e/0x1b50 kernel/sched/core.c:3498
 [<ffffffff827f9172>] schedule+0x92/0x1c0 kernel/sched/core.c:3553
 [<ffffffff811091a9>] freezable_schedule include/linux/freezer.h:171 [inline]
 [<ffffffff811091a9>] ptrace_stop+0x419/0x970 kernel/signal.c:1914
 [<ffffffff8110e9a7>] do_jobctl_trap kernel/signal.c:2133 [inline]
 [<ffffffff8110e9a7>] get_signal+0x1247/0x1aa0 kernel/signal.c:2259
 [<ffffffff8105250c>] do_signal+0x9c/0x1920 arch/x86/kernel/signal.c:807
 [<ffffffff81003dcc>] exit_to_usermode_loop+0x11c/0x160 arch/x86/entry/common.c:158
 [<ffffffff81005907>] prepare_exit_to_usermode arch/x86/entry/common.c:194 [inline]
 [<ffffffff81005907>] syscall_return_slowpath arch/x86/entry/common.c:263 [inline]
 [<ffffffff81005907>] do_syscall_64+0x3f7/0x570 arch/x86/entry/common.c:290
 [<ffffffff82807d13>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb
Shutting down cpus with NMI
Kernel Offset: disabled
Rebooting in 86400 seconds..

All crashes (3):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	Syz repro	Maintainers
ci-android-49-kasan-gce-root	2019/03/23 11:35	android-4.9	270fbfb5	3361bde5	.config	log	report	syz	hpa@zytor.com, linux-kernel@vger.kernel.org, mingo@redhat.com, tglx@linutronix.de, x86@kernel.org
ci-android-49-kasan-gce-root	2019/07/18 20:41	android-4.9	5e2c3408	7bb222f7	.config	log	report	syz	hpa@zytor.com, linux-kernel@vger.kernel.org, mingo@redhat.com, natechancellor@gmail.com, ndesaulniers@google.com, sashal@kernel.org, tglx@linutronix.de, x86@kernel.org
ci-android-49-kasan-gce-root	2019/07/18 19:49	android-4.9	5e2c3408	7bb222f7	.config	log	report		hpa@zytor.com, linux-kernel@vger.kernel.org, mingo@redhat.com, natechancellor@gmail.com, ndesaulniers@google.com, sashal@kernel.org, tglx@linutronix.de, x86@kernel.org