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Description of problem: Additional info: reporter: libreport-2.6.4 BUG: unable to handle kernel NULL pointer dereference at 0000000000000080 IP: [<ffffffff810640a0>] pvclock_clocksource_read+0x0/0xe0 PGD 0 Oops: 0000 [#1] SMP Modules linked in: vhost_net vhost macvtap macvlan tun ip6t_rpfilter ip6t_REJECT nf_reject_ipv6 xt_conntrack ip_set nfnetlink ebtable_nat ebtable_broute bridge stp llc ebtable_filter ebtables ip6table_nat nf_conntrack_ipv6 nf_defrag_ipv6 nf_nat_ipv6 ip6table_mangle ip6table_security ip6table_raw ip6table_filter ip6_tables iptable_nat nf_conntrack_ipv4 nf_defrag_ipv4 nf_nat_ipv4 nf_nat nf_conntrack iptable_mangle iptable_security iptable_raw coretemp kvm_intel kvm irqbypass crct10dif_pclmul dm_thin_pool crc32_pclmul dm_persistent_data dm_bio_prison iTCO_wdt iTCO_vendor_support lpc_ich i2c_i801 acpi_cpufreq shpchp i2c_ismt tpm_tis tpm nfsd auth_rpcgss nfs_acl lockd grace sunrpc xfs libcrc32c crc32c_intel uas igb usb_storage ptp pps_core i2c_algo_bit dca fjes CPU: 2 PID: 1692 Comm: qemu-system-x86 Not tainted 4.4.6-300.fc23.x86_64 #1 Hardware name: ADI Engineering RCC-VE/RCC-VE, BIOS ADI_RCCVE-01.00.00.08-nodebug 01/22/2016 task: ffff880274940000 ti: ffff8802673f4000 task.ti: ffff8802673f4000 RIP: 0010:[<ffffffff810640a0>] [<ffffffff810640a0>] pvclock_clocksource_read+0x0/0xe0 RSP: 0018:ffff8802673f7cb8 EFLAGS: 00010202 RAX: 0000000000000000 RBX: 0000adf713397502 RCX: 0000000000000000 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000080 RBP: ffff8802673f7cc0 R08: ffffffffa054a330 R09: 0000000000000000 R10: 000000010b6215fb R11: ffff8800bb9d39e0 R12: 000000000f7a3cc6 R13: 0000000000000000 R14: ffff8802673231a0 R15: ffff8802671e8048 FS: 00007f1b877b7700(0000) GS:ffff88027fd00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000080 CR3: 0000000267271000 CR4: 00000000001026e0 Stack: ffffffff8106325e ffff8802673f7ce0 ffffffff811155d7 ffff880267320000 0000000000000003 ffff8802673f7d50 ffffffffa02bc39a 0000000000000000 0000000000000000 ffff880274940000 ffffffff810e6270 ffff8802673f7d10 Call Trace: [<ffffffff8106325e>] ? kvm_clock_get_cycles+0x1e/0x20 [<ffffffff811155d7>] ktime_get+0x37/0xa0 [<ffffffffa02bc39a>] kvm_vcpu_block+0x5a/0x2e0 [kvm] [<ffffffff810e6270>] ? wake_atomic_t_function+0x70/0x70 [<ffffffffa02d7a74>] kvm_arch_vcpu_ioctl_run+0x4f4/0x14e0 [kvm] [<ffffffff81120c30>] ? futex_wake+0x90/0x180 [<ffffffffa02d1ada>] ? kvm_arch_vcpu_load+0x5a/0x220 [kvm] [<ffffffffa02c004d>] kvm_vcpu_ioctl+0x33d/0x620 [kvm] [<ffffffff81241248>] do_vfs_ioctl+0x298/0x480 [<ffffffffa02c799f>] ? kvm_on_user_return+0x6f/0x80 [kvm] [<ffffffff81337553>] ? security_file_ioctl+0x43/0x60 [<ffffffff812414a9>] SyS_ioctl+0x79/0x90 [<ffffffff817a04ee>] entry_SYSCALL_64_fastpath+0x12/0x71 Code: e5 0f ae e8 0f 31 8b 07 39 c8 75 04 a8 01 74 04 89 c1 eb ed 0f b6 05 c4 5c cd 00 22 47 1d 5d c3 66 66 2e 0f 1f 84 00 00 00 00 00 <44> 8b 07 eb 19 89 f2 48 f7 e2 48 0f ac d0 20 8b 17 41 39 d0 75 RIP [<ffffffff810640a0>] pvclock_clocksource_read+0x0/0xe0 RSP <ffff8802673f7cb8> CR2: 0000000000000080
Created attachment 1143776 [details] File: dmesg
*********** MASS BUG UPDATE ************** We apologize for the inconvenience. There is a large number of bugs to go through and several of them have gone stale. Due to this, we are doing a mass bug update across all of the Fedora 23 kernel bugs. Fedora 23 has now been rebased to 4.7.4-100.fc23. Please test this kernel update (or newer) and let us know if you issue has been resolved or if it is still present with the newer kernel. If you have moved on to Fedora 24 or 25, and are still experiencing this issue, please change the version to Fedora 24 or 25. If you experience different issues, please open a new bug report for those.
I haven't seen this again.