Public bug reported:
We have encountered the following oops on one of our VMs:
Apr 7 14:02:19 rancher1 kernel: [2089793.273674] BUG: unable to handle kernel
NULL pointer dereference at 0000000000000007
Apr 7 14:02:19 rancher1 kernel: [2089793.282782] IP:
split_swap_cluster+0x4f/0x70
Apr 7 14:02:19 rancher1 kernel: [2089793.330631] PGD 0 P4D 0
Apr 7 14:02:19 rancher1 kernel: [2089793.338279] Oops: 0002 [#1] SMP PTI
Apr 7 14:02:19 rancher1 kernel: [2089793.350774] Modules linked in: ufs msdos
xfs cmac arc4 md4 nls_utf8 cifs ccm fscache xt_tcpudp xt_set ip_set_hash_net
ip_set iptable_raw vxlan ip6_udp_tunnel udp_tunnel xt_nat xt_mark
xfrm6_mode_tunnel xfrm4_mode_tunnel esp4 ansi_cprng veth ipt_MASQUERADE
nf_nat_masquerade_ipv4 nf_conntrack_netlink nfnetlink xfrm_user xfrm_algo
iptable_nat nf_nat_ipv4 xt_addrtype iptable_filter nf_nat br_netfilter bridge
stp llc nf_conntrack_ipv4 nf_defrag_ipv4 xt_owner xt_conntrack nf_conntrack
iptable_security ip_tables x_tables aufs overlay mlx4_en pci_hyperv hv_balloon
serio_raw joydev ib_iser iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi
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
crct10dif_pclmul
Apr 7 14:02:19 rancher1 kernel: [2089793.618910] crc32_pclmul
ghash_clmulni_intel pcbc hid_generic aesni_intel aes_x86_64 crypto_simd
glue_helper cryptd hid_hyperv pata_acpi hyperv_fb cfbfillrect hyperv_keyboard
cfbimgblt hid cfbcopyarea hv_netvsc hv_utils
Apr 7 14:02:19 rancher1 kernel: [2089793.692250] CPU: 0 PID: 47 Comm: kswapd0
Not tainted 4.15.0-1040-azure #44-Ubuntu
Apr 7 14:02:19 rancher1 kernel: [2089793.725316] Hardware name: Microsoft
Corporation Virtual Machine/Virtual Machine, BIOS 090007 06/02/2017
Apr 7 14:02:19 rancher1 kernel: [2089793.762206] RIP:
0010:split_swap_cluster+0x4f/0x70
Apr 7 14:02:19 rancher1 kernel: [2089793.781768] RSP: 0018:ffffaaf900fbfbe0
EFLAGS: 00010246
Apr 7 14:02:19 rancher1 kernel: [2089793.800432] RAX: 0000000000000000 RBX:
00000000007290de RCX: 00000000007290de
Apr 7 14:02:19 rancher1 kernel: [2089793.824572] RDX: ffffaaf905001000 RSI:
0000000000118df9 RDI: 00000000007290de
Apr 7 14:02:19 rancher1 kernel: [2089793.854139] RBP: ffffaaf900fbfbe8 R08:
0000000000000001 R09: ffff9c647ffd4d00
Apr 7 14:02:19 rancher1 kernel: [2089793.882588] R10: ffff9c647ffd4000 R11:
0000000000000001 R12: fffff61ac4630000
Apr 7 14:02:19 rancher1 kernel: [2089793.909530] R13: fffff61ac4630080 R14:
fffff61ac4638000 R15: fffff61ac4630040
Apr 7 14:02:19 rancher1 kernel: [2089793.935871] FS: 0000000000000000(0000)
GS:ffff9c647fc00000(0000) knlGS:0000000000000000
Apr 7 14:02:19 rancher1 kernel: [2089793.966483] CS: 0010 DS: 0000 ES: 0000
CR0: 0000000080050033
Apr 7 14:02:19 rancher1 kernel: [2089793.987904] CR2: 0000000000000007 CR3:
000000003240a005 CR4: 00000000001606f0
Apr 7 14:02:19 rancher1 kernel: [2089794.017641] Call Trace:
Apr 7 14:02:19 rancher1 kernel: [2089794.028683]
split_huge_page_to_list+0x76e/0x7f0
Apr 7 14:02:19 rancher1 kernel: [2089794.051250]
deferred_split_scan+0x177/0x2d0
Apr 7 14:02:19 rancher1 kernel: [2089794.065213]
shrink_slab.part.50+0x20b/0x440
Apr 7 14:02:19 rancher1 kernel: [2089794.083856] shrink_node+0x2fc/0x310
Apr 7 14:02:19 rancher1 kernel: [2089794.097963] kswapd+0x32a/0x770
Apr 7 14:02:19 rancher1 kernel: [2089794.110523] kthread+0x105/0x140
Apr 7 14:02:19 rancher1 kernel: [2089794.122680] ?
mem_cgroup_shrink_node+0x190/0x190
Apr 7 14:02:19 rancher1 kernel: [2089794.139139] ?
kthread_destroy_worker+0x50/0x50
Apr 7 14:02:19 rancher1 kernel: [2089794.155543] ret_from_fork+0x35/0x40
Apr 7 14:02:19 rancher1 kernel: [2089794.167841] Code: c1 e3 07 48 c1 eb 10 48
8d 1c d8 48 89 df e8 49 9f 79 00 80 63 07 fb 48 85 db 74 17 48 89 df c6 07 00
0f 1f 40 00 31 c0 5b 5d c3 <80> 24 25 07 00 00 00 fb 31 c0 5b 5d c3 b8 f0 ff ff
ff eb e9 0f
Apr 7 14:02:19 rancher1 kernel: [2089794.237196] RIP:
split_swap_cluster+0x4f/0x70 RSP: ffffaaf900fbfbe0
Apr 7 14:02:19 rancher1 kernel: [2089794.259910] CR2: 0000000000000007
Apr 7 14:02:19 rancher1 kernel: [2089794.270891] ---[ end trace
5b797d89aee7fc1b ]---
The machine become unstable after this until reboot, like reading some
namespaced process' command arguments hung, so it is possible that there
was some kernel data structure corruption. The machine was under large
memory pressure, when this happened.
** Affects: linux-azure (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1823859
Title:
NULL pointer dereference in split_swap_cluster
Status in linux-azure package in Ubuntu:
New
Bug description:
We have encountered the following oops on one of our VMs:
Apr 7 14:02:19 rancher1 kernel: [2089793.273674] BUG: unable to handle
kernel NULL pointer dereference at 0000000000000007
Apr 7 14:02:19 rancher1 kernel: [2089793.282782] IP:
split_swap_cluster+0x4f/0x70
Apr 7 14:02:19 rancher1 kernel: [2089793.330631] PGD 0 P4D 0
Apr 7 14:02:19 rancher1 kernel: [2089793.338279] Oops: 0002 [#1] SMP PTI
Apr 7 14:02:19 rancher1 kernel: [2089793.350774] Modules linked in: ufs
msdos xfs cmac arc4 md4 nls_utf8 cifs ccm fscache xt_tcpudp xt_set
ip_set_hash_net ip_set iptable_raw vxlan ip6_udp_tunnel udp_tunnel xt_nat
xt_mark xfrm6_mode_tunnel xfrm4_mode_tunnel esp4 ansi_cprng veth ipt_MASQUERADE
nf_nat_masquerade_ipv4 nf_conntrack_netlink nfnetlink xfrm_user xfrm_algo
iptable_nat nf_nat_ipv4 xt_addrtype iptable_filter nf_nat br_netfilter bridge
stp llc nf_conntrack_ipv4 nf_defrag_ipv4 xt_owner xt_conntrack nf_conntrack
iptable_security ip_tables x_tables aufs overlay mlx4_en pci_hyperv hv_balloon
serio_raw joydev ib_iser iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi
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
crct10dif_pclmul
Apr 7 14:02:19 rancher1 kernel: [2089793.618910] crc32_pclmul
ghash_clmulni_intel pcbc hid_generic aesni_intel aes_x86_64 crypto_simd
glue_helper cryptd hid_hyperv pata_acpi hyperv_fb cfbfillrect hyperv_keyboard
cfbimgblt hid cfbcopyarea hv_netvsc hv_utils
Apr 7 14:02:19 rancher1 kernel: [2089793.692250] CPU: 0 PID: 47 Comm:
kswapd0 Not tainted 4.15.0-1040-azure #44-Ubuntu
Apr 7 14:02:19 rancher1 kernel: [2089793.725316] Hardware name: Microsoft
Corporation Virtual Machine/Virtual Machine, BIOS 090007 06/02/2017
Apr 7 14:02:19 rancher1 kernel: [2089793.762206] RIP:
0010:split_swap_cluster+0x4f/0x70
Apr 7 14:02:19 rancher1 kernel: [2089793.781768] RSP: 0018:ffffaaf900fbfbe0
EFLAGS: 00010246
Apr 7 14:02:19 rancher1 kernel: [2089793.800432] RAX: 0000000000000000 RBX:
00000000007290de RCX: 00000000007290de
Apr 7 14:02:19 rancher1 kernel: [2089793.824572] RDX: ffffaaf905001000 RSI:
0000000000118df9 RDI: 00000000007290de
Apr 7 14:02:19 rancher1 kernel: [2089793.854139] RBP: ffffaaf900fbfbe8 R08:
0000000000000001 R09: ffff9c647ffd4d00
Apr 7 14:02:19 rancher1 kernel: [2089793.882588] R10: ffff9c647ffd4000 R11:
0000000000000001 R12: fffff61ac4630000
Apr 7 14:02:19 rancher1 kernel: [2089793.909530] R13: fffff61ac4630080 R14:
fffff61ac4638000 R15: fffff61ac4630040
Apr 7 14:02:19 rancher1 kernel: [2089793.935871] FS: 0000000000000000(0000)
GS:ffff9c647fc00000(0000) knlGS:0000000000000000
Apr 7 14:02:19 rancher1 kernel: [2089793.966483] CS: 0010 DS: 0000 ES: 0000
CR0: 0000000080050033
Apr 7 14:02:19 rancher1 kernel: [2089793.987904] CR2: 0000000000000007 CR3:
000000003240a005 CR4: 00000000001606f0
Apr 7 14:02:19 rancher1 kernel: [2089794.017641] Call Trace:
Apr 7 14:02:19 rancher1 kernel: [2089794.028683]
split_huge_page_to_list+0x76e/0x7f0
Apr 7 14:02:19 rancher1 kernel: [2089794.051250]
deferred_split_scan+0x177/0x2d0
Apr 7 14:02:19 rancher1 kernel: [2089794.065213]
shrink_slab.part.50+0x20b/0x440
Apr 7 14:02:19 rancher1 kernel: [2089794.083856] shrink_node+0x2fc/0x310
Apr 7 14:02:19 rancher1 kernel: [2089794.097963] kswapd+0x32a/0x770
Apr 7 14:02:19 rancher1 kernel: [2089794.110523] kthread+0x105/0x140
Apr 7 14:02:19 rancher1 kernel: [2089794.122680] ?
mem_cgroup_shrink_node+0x190/0x190
Apr 7 14:02:19 rancher1 kernel: [2089794.139139] ?
kthread_destroy_worker+0x50/0x50
Apr 7 14:02:19 rancher1 kernel: [2089794.155543] ret_from_fork+0x35/0x40
Apr 7 14:02:19 rancher1 kernel: [2089794.167841] Code: c1 e3 07 48 c1 eb 10
48 8d 1c d8 48 89 df e8 49 9f 79 00 80 63 07 fb 48 85 db 74 17 48 89 df c6 07
00 0f 1f 40 00 31 c0 5b 5d c3 <80> 24 25 07 00 00 00 fb 31 c0 5b 5d c3 b8 f0 ff
ff ff eb e9 0f
Apr 7 14:02:19 rancher1 kernel: [2089794.237196] RIP:
split_swap_cluster+0x4f/0x70 RSP: ffffaaf900fbfbe0
Apr 7 14:02:19 rancher1 kernel: [2089794.259910] CR2: 0000000000000007
Apr 7 14:02:19 rancher1 kernel: [2089794.270891] ---[ end trace
5b797d89aee7fc1b ]---
The machine become unstable after this until reboot, like reading some
namespaced process' command arguments hung, so it is possible that
there was some kernel data structure corruption. The machine was under
large memory pressure, when this happened.
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