I've also tested newer kernels and they're all susceptible to this (or a
similar/related) problem. Sometimes I also see the following stack
traces:
[ 125.300088] BUG: unable to handle kernel NULL pointer dereference at 00000074
[ 125.308050] IP: ma_put+0x25/0x40
[ 125.308551] *pdpt = 000000001b027001 *pde = 0000000000000000
[ 125.309388] Oops: 0002 [#1] SMP
[ 125.309885] Modules linked in: ufs msdos xfs openvswitch nsh
nf_conntrack_ipv6 nf_nat_ipv6 nf_conntrack_ipv4 nf_defrag_ipv4 nf_nat_ipv4
nf_defrag_ipv6 nf_nat nf_conntrack isofs kvm_intel kvm joydev irqbypass
input_leds serio_raw sch_fq_codel ib_iser rdma_cm iw_cm ib_cm ib_core iscsi_tcp
libiscsi_tcp libiscsi scsi_transport_iscsi ip_tables x_tables autofs4 btrfs
zstd_compress raid10 raid456 async_raid6_recov async_memcpy async_pq async_xor
async_tx xor raid6_pq libcrc32c raid1 raid0 multipath linear psmouse virtio_blk
virtio_net floppy
[ 125.316176] CPU: 0 PID: 1053 Comm: ovs-vswitchd Tainted: G W
4.15.0-43-generic #46-Ubuntu
[ 125.317585] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS
1.11.1-1ubuntu1 04/01/2014
[ 125.318888] EIP: ma_put+0x25/0x40
[ 125.319428] EFLAGS: 00010246 CPU: 0
[ 125.319984] EAX: 00000000 EBX: db28ede0 ECX: 000000ff EDX: fffffe01
[ 125.320873] ESI: dc692c00 EDI: dc692c6c EBP: db01fb20 ESP: db01fb1c
[ 125.321765] DS: 007b ES: 007b FS: 00d8 GS: 00e0 SS: 0068
[ 125.322531] CR0: 80050033 CR2: 00000074 CR3: 1b9cfac0 CR4: 000006f0
[ 125.323471] DR0: 00000000 DR1: 00000000 DR2: 00000000 DR3: 00000000
[ 125.324405] DR6: fffe0ff0 DR7: 00000400
[ 125.325018] Call Trace:
[ 125.325447] ipv6_mc_destroy_dev+0x4c/0x80
[ 125.326103] addrconf_ifdown+0x3c9/0x4c0
[ 125.326746] addrconf_notify+0x178/0x970
[ 125.327390] ? find_next_bit+0xa/0x10
[ 125.327999] ? cpumask_next+0x15/0x20
[ 125.328607] ? xfrm_policy_cache_flush+0x12f/0x14a
[ 125.329364] ? fib_add_ifaddr+0x170/0x170
[ 125.330031] ? inet6_ifinfo_notify+0xb0/0xb0
[ 125.330718] notifier_call_chain+0x51/0x80
[ 125.331380] raw_notifier_call_chain+0x11/0x20
[ 125.332092] call_netdevice_notifiers_info+0x25/0x50
[ 125.332954] rollback_registered_many+0x21f/0x390
[ 125.333725] unregister_netdevice_queue+0x74/0xe0
[ 125.334451] internal_dev_destroy+0x32/0x50 [openvswitch]
[ 125.335210] ovs_vport_del+0x39/0x40 [openvswitch]
[ 125.335917] __dp_destroy+0x90/0xc0 [openvswitch]
[ 125.336649] ovs_dp_cmd_del+0x71/0xd0 [openvswitch]
[ 125.337406] genl_rcv_msg+0x1fe/0x3a0
[ 125.338074] ? update_curr+0x80/0x240
[ 125.338715] ? genl_rcv+0x30/0x30
[ 125.339257] netlink_rcv_skb+0x6e/0xf0
[ 125.339860] genl_rcv+0x21/0x30
[ 125.340377] netlink_unicast+0x16f/0x200
[ 125.341001] netlink_sendmsg+0x247/0x390
[ 125.341633] ? netlink_unicast+0x200/0x200
[ 125.342309] sock_sendmsg+0x32/0x40
[ 125.342892] ___sys_sendmsg+0x249/0x260
[ 125.343522] ? default_wake_function+0x10/0x20
[ 125.344236] ? pollwake+0x68/0x90
[ 125.344796] ? wake_up_q+0x60/0x60
[ 125.345368] ? current_time+0x39/0x70
[ 125.345983] ? __wake_up_common_lock+0x82/0xb0
[ 125.346697] ? __atime_needs_update+0x7a/0x160
[ 125.347407] ? touch_atime+0x2b/0xb0
[ 125.348002] ? __wake_up_sync_key+0x1e/0x30
[ 125.348682] ? fsnotify_grab_connector+0x37/0x60
[ 125.349421] ? fsnotify_destroy_marks+0x10/0xa0
[ 125.350145] ? __fget_light+0x4d/0x60
[ 125.350754] __sys_sendmsg+0x3e/0x80
[ 125.351351] SyS_socketcall+0x185/0x680
[ 125.351981] ? mntput+0x20/0x40
[ 125.352514] ? __fput+0x15f/0x200
[ 125.353082] do_fast_syscall_32+0x7f/0x1e0
[ 125.353754] entry_SYSENTER_32+0x4e/0x7c
[ 125.354401] EIP: 0xb7fd5d09
[ 125.354892] EFLAGS: 00200293 CPU: 0
[ 125.355477] EAX: ffffffda EBX: 00000010 ECX: bfb3b210 EDX: 00000000
[ 125.356420] ESI: b7cf8000 EDI: bfb3b288 EBP: 00af8d00 ESP: bfb3b200
[ 125.357367] DS: 007b ES: 007b FS: 0000 GS: 0033 SS: 007b
[ 125.358200] Code: ff ff ff 8d 76 00 3e 8d 74 26 00 55 89 e5 53 3e ff 48 4c
0f 88 48 04 05 00 74 0b 5b 5d c3 90 8d b4 26 00 00 00 00 89 c3 8b 40 10 <3e> ff
48 74 0f 88 31 04 05 00 75 05 e8 2a b6 01 00 89 d8 e8 53
[ 125.360908] EIP: ma_put+0x25/0x40 SS:ESP: 0068:db01fb1c
[ 125.361728] CR2: 0000000000000074
[ 125.362329] ---[ end trace ce5d2e276f1f9782 ]---
** Also affects: linux (Ubuntu Disco)
Importance: Undecided
Assignee: Juerg Haefliger (juergh)
Status: Incomplete
** Also affects: linux (Ubuntu Cosmic)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1814054
Title:
BUG: unable to handle kernel paging request at ee835a95
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