Server Crash with Error "sysrq: SysRq : Trigger a crash" (Doc ID 2668292.1)

Last updated on APRIL 20, 2023

Applies to:

Symptoms

 Linux Server crashed, the vmcore file shows below:

WARNING: kernel relocated [928MB]: patching 89859 gdb minimal_symbol values

KERNEL: /share/linuxrpm/vmlinux_repo/64/4.14.35-1818.3.3.el7uek.x86_64/vmlinux
DUMPFILE: vmcore [PARTIAL DUMP]
CPUS: 5
DATE: Sun May 3 12:20:35 2020
UPTIME: 00:12:32
LOAD AVERAGE: 0.00, 0.14, 0.17
TASKS: 422
NODENAME: SGEDRDB
RELEASE: 4.14.35-1818.3.3.el7uek.x86_64
VERSION: #2 SMP Mon Sep 24 14:45:01 PDT 2018
MACHINE: x86_64 (2294 Mhz)
MEMORY: 640 GB
PANIC: "sysrq: SysRq : Trigger a crash" 
PID: 10816
COMMAND: "bash" <<<=====
TASK: ffff9c5e6b2c97c0 [THREAD_INFO: ffff9c5e6b2c97c0]
CPU: 0
STATE: TASK_RUNNING (SYSRQ)

[ 752.743750] Modules linked in: macsec sctp_diag sctp tcp_diag udp_diag inet_diag unix_diag af_packet_diag netlink_diag xt_CHECKSUM iptable_mangle ipt_MASQUERADE nf_nat_masquerade_ipv4 iptable_nat nf_nat_ipv4 nf_nat nf_conntrack_ipv4 nf_defrag_ipv4 xt_conntrack nf_conntrack ipt_REJECT nf_reject_ipv4 tun bridge stp llc ebtable_filter ebtables ip6table_filter ip6_tables iptable_filter oracleasm sunrpc ppdev xen_fbfront crct10dif_pclmul crc32_pclmul ghash_clmulni_intel pcbc sg aesni_intel crypto_simd glue_helper cryptd parport_pc parport i2c_piix4 pcspkr binfmt_misc ip_tables xfs libcrc32c sr_mod cdrom xen_netfront xen_blkfront ata_generic pata_acpi floppy cirrus drm_kms_helper syscopyarea crc32c_intel sysfillrect sysimgblt fb_sys_fops ttm serio_raw drm ata_piix libata dm_mirror dm_region_hash dm_log
[ 752.743794] dm_mod
[ 752.743796] CPU: 0 PID: 10816 Comm: bash Not tainted 4.14.35-1818.3.3.el7uek.x86_64 #2
[ 752.743797] Hardware name: Xen HVM domU, BIOS 4.4.4OVM 11/16/2018
[ 752.743798] task: ffff9c5e6b2c97c0 task.stack: ffffb169d96b0000
[ 752.743800] RIP: 0010:sysrq_handle_crash+0x16/0x20
[ 752.743801] RSP: 0018:ffffb169d96b3da8 EFLAGS: 00010246
[ 752.743802] RAX: ffffffffbb4ed800 RBX: ffffffffbc57fe20 RCX: 0000000000000000
[ 752.743803] RDX: 0000000000000000 RSI: ffff9c5e8f216938 RDI: 0000000000000063
[ 752.743804] RBP: ffffb169d96b3da8 R08: 00000000fffffffe R09: 000000000000022f
[ 752.743804] R10: 0000000000000005 R11: 000000000000022e R12: 0000000000000063
[ 752.743805] R13: 0000000000000000 R14: 0000000000000004 R15: 0000000000000002
[ 752.743806] FS: 00007f35e2b1d740(0000) GS:ffff9c5e8f200000(0000) knlGS:0000000000000000
[ 752.743807] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 752.743808] CR2: 0000000000000000 CR3: 0000009d6b2dc001 CR4: 00000000001606f0
[ 752.743811] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 752.743811] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[ 752.743812] Call Trace:
[ 752.743816] __handle_sysrq+0xff/0x156
[ 752.743818] write_sysrq_trigger+0x28/0x37
[ 752.743822] proc_reg_write+0x40/0x72
[ 752.743825] ? __fd_install+0x31/0xce
[ 752.743828] __vfs_write+0x3a/0x16d
[ 752.743832] ? entry_SYSCALL_64_after_hwframe+0x113/0x0
[ 752.743833] vfs_write+0xb2/0x1a1
[ 752.743837] ? syscall_trace_enter+0x1ce/0x2b8
[ 752.743839] SyS_write+0x55/0xb9
[ 752.743840] ? entry_SYSCALL_64_after_hwframe+0x95/0x0
[ 752.743841] do_syscall_64+0x79/0x1ae
[ 752.743843] entry_SYSCALL_64_after_hwframe+0x151/0x0
[ 752.743844] RIP: 0033:0x7f35e220a090
[ 752.743845] RSP: 002b:00007fffa2ce51f8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
[ 752.743846] RAX: ffffffffffffffda RBX: 0000000000000002 RCX: 00007f35e220a090
[ 752.743847] RDX: 0000000000000002 RSI: 00007f35e2b35000 RDI: 0000000000000001
[ 752.743847] RBP: 00007f35e2b35000 R08: 000000000000000a R09: 00007f35e2b1d740
[ 752.743848] R10: 00007f35e2b1d740 R11: 0000000000000246 R12: 00007f35e24e2400
[ 752.743849] R13: 0000000000000002 R14: 0000000000000001 R15: 0000000000000000
[ 752.743850] Code: 48 89 e5 0f 0b 5d c3 90 90 90 90 90 90 90 90 90 90 90 90 90 90 0f 1f 44 00 00 55 c7 05 7c 16 f6 00 01 00 00 00 48 89 e5 0f ae f8 <c6> 04 25 00 00 00 00 01 5d c3 0f 1f 44 00 00 55 31 c0 c7 05 ae
[ 752.743868] RIP: sysrq_handle_crash+0x16/0x20 RSP: ffffb169d96b3da8
[ 752.743869] CR2: 0000000000000000

Cause

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