[Bug 1921211] Re: Taking a memory dump of user mode process on Xenial hosts causes bugcheck/kernel panic and core dump

2021-05-18 Thread Steve Beattie 
This was fixed with linux 4.4.0-211.243 in Ubuntu 16.04 ESM (Infra).

** Changed in: linux (Ubuntu Xenial)
   Status: Fix Committed => Fix Released

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Title:
  Taking a memory dump of user mode process on Xenial hosts causes
  bugcheck/kernel panic and core dump

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[Bug 1921211] Re: Taking a memory dump of user mode process on Xenial hosts causes bugcheck/kernel panic and core dump

2021-05-04 Thread Marcelo Cerri 
I verified the version in esm-proposed fixes the issue. I used the
following steps to verify it:

Using a Xenial VM with >2GB of memory (that's a requirement of the mysql
server docker we are using):

$ sudo apt install docker.io gdb
$ sudo docker pull mcr.microsoft.com/mssql/server:2019-latest
$ sudo docker run -e "ACCEPT_EULA=Y" -e "SA_PASSWORD=" -p 
1433:1433 --name sql1 -h sql1 -d mcr.microsoft.com/mssql/server:2019-latest
$ sudo ps -ef | grep sql # get the pid
$ sudo gdb -p PID
(gdb) generate-core-file ./core

With 4.4.0-210.242 I get a kernel bug.
With 4.4.0-211.243 it either succeeds or oomkiller kicks in if memory is not 
enough.

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Title:
  Taking a memory dump of user mode process on Xenial hosts causes
  bugcheck/kernel panic and core dump

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[Bug 1921211] Re: Taking a memory dump of user mode process on Xenial hosts causes bugcheck/kernel panic and core dump

2021-04-09 Thread Kleber Sacilotto de Souza 
** Changed in: linux (Ubuntu)
   Status: Incomplete => Invalid

** Changed in: linux (Ubuntu Xenial)
   Status: In Progress => Fix Committed

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Title:
  Taking a memory dump of user mode process on Xenial hosts causes
  bugcheck/kernel panic and core dump

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[Bug 1921211] Re: Taking a memory dump of user mode process on Xenial hosts causes bugcheck/kernel panic and core dump

2021-03-24 Thread Marcelo Cerri 
** Description changed:

  [Impact]
  
  We have some Ubuntu 16.04 hosts (in Hyper-V) being used for testing some 
Ubuntu 20.04 container. As part of the testing we were attempting to take a 
memory dump of a container running SQL Server with Ubuntu 20.04 on the Ubuntu 
16.04 host we started seeing kernel panic and core dump. It started happening 
after a specific Xenial kernel update on the host.
  4.4.0-204-generic - Systems that are crashing
  4.4.0-201-generic - Systems that are able to capture dump
- 
  
  Note from the developer indicates following logging showing up.
  
  Now the following is output right after I attempt to start the dump. (gdb, 
attach ###, generate-core-file /var/opt/mssql/log/rdorr.delme.core)
  
  [Fri Mar 19 20:01:38 2021] systemd-journald[581]: Successfully sent stream 
file descriptor to service manager.
  [Fri Mar 19 20:01:41 2021] cni0: port 9(vethdec5d2b7) entered forwarding state
  [Fri Mar 19 20:02:42 2021] systemd-journald[581]: Successfully sent stream 
file descriptor to service manager.
  [Fri Mar 19 20:03:04 2021] [ cut here ]
  [Fri Mar 19 20:03:04 2021] kernel BUG at 
/build/linux-qlAbvR/linux-4.4.0/mm/memory.c:3214!
  [Fri Mar 19 20:03:04 2021] invalid opcode:  [#1] SMP
  [Fri Mar 19 20:03:04 2021] Modules linked in: veth vxlan ip6_udp_tunnel 
udp_tunnel xt_statistic xt_nat ipt_REJECT nf_reject_ipv4 xt_tcpudp ip_vs_sh 
ip_vs_wrr ip_vs_rr ip_vs libcrc32c ip6table_nat nf_conntrack_ipv6 
nf_defrag_ipv6 nf_nat_ipv6 ip6_tables xt_comment xt_mark xt_conntrack 
ipt_MASQUERADE nf_nat_masquerade_ipv4 nf_conntrack_netlink nfnetlink xfrm_user 
xfrm_algo xt_addrtype iptable_filter iptable_nat nf_conntrack_ipv4 
nf_defrag_ipv4 nf_nat_ipv4 nf_nat nf_conntrack ip_tables x_tables br_netfilter 
bridge stp llc aufs overlay nls_utf8 isofs crct10dif_pclmul crc32_pclmul 
ghash_clmulni_intel aesni_intel aes_x86_64 lrw gf128mul glue_helper ablk_helper 
cryptd input_leds serio_raw i2c_piix4 hv_balloon hyperv_fb 8250_fintek joydev 
mac_hid autofs4 hid_generic hv_utils hid_hyperv ptp hv_netvsc hid hv_storvsc 
pps_core
  [Fri Mar 19 20:03:04 2021] hyperv_keyboard scsi_transport_fc psmouse 
pata_acpi hv_vmbus floppy fjes
  [Fri Mar 19 20:03:04 2021] CPU: 1 PID: 24869 Comm: gdb Tainted: G W 
4.4.0-204-generic #236-Ubuntu
  [Fri Mar 19 20:03:04 2021] Hardware name: Microsoft Corporation Virtual 
Machine/Virtual Machine, BIOS 090007 05/18/2018
  [Fri Mar 19 20:03:04 2021] task: 880db9229c80 ti: 880d93b9c000 
task.ti: 880d93b9c000
  [Fri Mar 19 20:03:04 2021] RIP: 0010:[] 
[] handle_mm_fault+0x13de/0x1b80
  [Fri Mar 19 20:03:04 2021] RSP: 0018:880d93b9fc28 EFLAGS: 00010246
  [Fri Mar 19 20:03:04 2021] RAX: 0100 RBX:  RCX: 
0120
  [Fri Mar 19 20:03:04 2021] RDX: 880ea635f3e8 RSI: 3000 RDI: 

  [Fri Mar 19 20:03:04 2021] RBP: 880d93b9fce8 R08: 3ff32179a120 R09: 
007d
  [Fri Mar 19 20:03:04 2021] R10: 880003e8 R11: 03e8 R12: 
8800ea672708
  [Fri Mar 19 20:03:04 2021] R13:  R14: 00010247d000 R15: 
8800f27fe400
  [Fri Mar 19 20:03:04 2021] FS: 7fdc26061600() 
GS:88102564() knlGS:
  [Fri Mar 19 20:03:04 2021] CS: 0010 DS:  ES:  CR0: 80050033
  [Fri Mar 19 20:03:04 2021] CR2: 55e3a0011290 CR3: 000d93ba4000 CR4: 
00160670
  [Fri Mar 19 20:03:04 2021] Stack:
  [Fri Mar 19 20:03:04 2021] 81082929 fffd 81082252 
880d93b9fca8
  [Fri Mar 19 20:03:04 2021] 811c7bca 8800f27fe400 00010247d000 
880e74a88090
  [Fri Mar 19 20:03:04 2021] 3a98d7f0 880e0001 880003e8 
0017
  [Fri Mar 19 20:03:04 2021] Call Trace:
  [Fri Mar 19 20:03:04 2021] [] ? mm_access+0x79/0xa0
  [Fri Mar 19 20:03:04 2021] [] ? mmput+0x12/0x130
  [Fri Mar 19 20:03:04 2021] [] ? follow_page_pte+0x1ca/0x3d0
  [Fri Mar 19 20:03:04 2021] [] ? follow_page_mask+0x214/0x3a0
  [Fri Mar 19 20:03:04 2021] [] __get_user_pages+0x130/0x680
  [Fri Mar 19 20:03:04 2021] [] ? path_openat+0x348/0x1360
  [Fri Mar 19 20:03:04 2021] [] get_user_pages+0x34/0x40
  [Fri Mar 19 20:03:04 2021] [] __access_remote_vm+0xe4/0x2d0
  [Fri Mar 19 20:03:04 2021] [] ? 
alloc_pages_current+0x8c/0x110
  [Fri Mar 19 20:03:04 2021] [] access_remote_vm+0x1f/0x30
  [Fri Mar 19 20:03:04 2021] [] mem_rw.isra.16+0xfa/0x190
  [Fri Mar 19 20:03:04 2021] [] mem_read+0x18/0x20
  [Fri Mar 19 20:03:04 2021] [] __vfs_read+0x1b/0x40
  [Fri Mar 19 20:03:04 2021] [] vfs_read+0x86/0x130
  [Fri Mar 19 20:03:04 2021] [] SyS_pread64+0x95/0xb0
  [Fri Mar 19 20:03:04 2021] [] 
entry_SYSCALL_64_fastpath+0x22/0xd0
  [Fri Mar 19 20:03:04 2021] Code: d4 ee ff ff 48 8b 7d 98 89 45 88 e8 2d c7 fd 
ff 8b 45 88 89 c3 e9 be ee ff ff 48 8b bd 70 ff ff ff e8 c7 cf 69 00 e9 ad ee 
ff ff <0f> 0b 4c 89 e7 4c 89 9d 70 ff ff ff e8 f1 c9 00 00 85 c0 4c 8b
  [Fri Mar 19 20:03:04