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to b...@alien8.de, h...@zytor.com, jmat...@google.com, jo...@8bytes.org, k...@vger.kernel.org, linux-...@vger.kernel.org, mi...@redhat.com, pbon...@redhat.com, sean.j.chr...@intel.com, syzkall...@googlegroups.com, tg...@linutronix.de, vkuz...@redhat.com, wanp...@tencent.com, x...@kernel.org
Hello,
syzbot found the following crash on:
HEAD commit: e6e6ec48 Merge tag 'fscrypt-for-linus' of git://git.kernel..
git tree: upstream
console output:
https://syzkaller.appspot.com/x/log.txt?x=163a5753e00000
kernel config:
https://syzkaller.appspot.com/x/.config?x=c2e311dba9a02ba9
dashboard link:
https://syzkaller.appspot.com/bug?extid=59cd93bc8960efdbae86
compiler: gcc (GCC) 9.0.0 20181231 (experimental)
syz repro:
https://syzkaller.appspot.com/x/repro.syz?x=144d1619e00000
C reproducer:
https://syzkaller.appspot.com/x/repro.c?x=115c4475e00000
Bisection is inconclusive: the bug happens on the oldest tested release.
bisection log:
https://syzkaller.appspot.com/x/bisect.txt?x=165b512de00000
final crash:
https://syzkaller.appspot.com/x/report.txt?x=155b512de00000
console output:
https://syzkaller.appspot.com/x/log.txt?x=115b512de00000
IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by:
syzbot+59cd93...@syzkaller.appspotmail.com
==================================================================
BUG: KASAN: user-memory-access in atomic_read include/asm-generic/atomic-instrumented.h:26 [inline]
BUG: KASAN: user-memory-access in __kvmclock_cpufreq_notifier arch/x86/kvm/x86.c:7133 [inline]
BUG: KASAN: user-memory-access in kvmclock_cpufreq_notifier+0x1e9/0x580 arch/x86/kvm/x86.c:7172
Read of size 4 at addr 00000000896bb8f0 by task syz-executor372/10372
CPU: 0 PID: 10372 Comm: syz-executor372 Not tainted 5.6.0-rc5-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
<IRQ>
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0x188/0x20d lib/dump_stack.c:118
__kasan_report.cold+0x5/0x32 mm/kasan/report.c:510
kasan_report+0xe/0x20 mm/kasan/common.c:641
check_memory_region_inline mm/kasan/generic.c:185 [inline]
check_memory_region+0x128/0x190 mm/kasan/generic.c:192
atomic_read include/asm-generic/atomic-instrumented.h:26 [inline]
__kvmclock_cpufreq_notifier arch/x86/kvm/x86.c:7133 [inline]
kvmclock_cpufreq_notifier+0x1e9/0x580 arch/x86/kvm/x86.c:7172
</IRQ>
==================================================================
Kernel panic - not syncing: panic_on_warn set ...
CPU: 0 PID: 10372 Comm: syz-executor372 Tainted: G B 5.6.0-rc5-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
<IRQ>
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0x188/0x20d lib/dump_stack.c:118
panic+0x2e3/0x75c kernel/panic.c:221
end_report+0x43/0x49 mm/kasan/report.c:96
__kasan_report.cold+0xd/0x32 mm/kasan/report.c:513
kasan_report+0xe/0x20 mm/kasan/common.c:641
check_memory_region_inline mm/kasan/generic.c:185 [inline]
check_memory_region+0x128/0x190 mm/kasan/generic.c:192
atomic_read include/asm-generic/atomic-instrumented.h:26 [inline]
__kvmclock_cpufreq_notifier arch/x86/kvm/x86.c:7133 [inline]
kvmclock_cpufreq_notifier+0x1e9/0x580 arch/x86/kvm/x86.c:7172
</IRQ>
Shutting down cpus with NMI
Kernel Offset: disabled
Rebooting in 86400 seconds..
---
This bug is generated by a bot. It may contain errors.
See
https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at
syzk...@googlegroups.com.
syzbot will keep track of this bug report. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
For information about bisection process see:
https://goo.gl/tpsmEJ#bisection
syzbot can test patches for this bug, for details see:
https://goo.gl/tpsmEJ#testing-patches