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+59cd93bc8960efdbae86@xxxxxxxxxxxxxxxxxxxxxxxxx ================================================================== 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 syzkaller@xxxxxxxxxxxxxxxx. 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
