FYI, we noticed the following commit (built with gcc-7): commit: f771fde82051976a6fc0fd570f8b86de4a92124b ("keys: Simplify key description management") https://kernel.googlesource.com/pub/scm/linux/kernel/git/torvalds/linux.git master in testcase: trinity with following parameters: runtime: 300s test-description: Trinity is a linux system call fuzz tester. test-url: http://codemonkey.org.uk/projects/trinity/ on test machine: qemu-system-x86_64 -enable-kvm -cpu SandyBridge -smp 2 -m 4G caused below changes (please refer to attached dmesg/kmsg for entire log/backtrace): +-------------------------------------------------+------------+------------+ | | 3b8c4a08a4 | f771fde820 | +-------------------------------------------------+------------+------------+ | boot_successes | 705 | 703 | | boot_failures | 43 | 32 | | BUG:kernel_reboot-without-warning_in_test_stage | 12 | | | invoked_oom-killer:gfp_mask=0x | 20 | 15 | | Mem-Info | 20 | 15 | | BUG:kernel_hang_in_boot_stage | 10 | 5 | | RIP:__clear_user | 2 | | | RIP:copy_user_generic_string | 3 | 3 | | RIP:__get_user_8 | 1 | | | WARNING:at_kernel/rcu/tree.c:#rcu_irq_exit | 1 | | | RIP:rcu_irq_exit | 1 | | | RIP:native_safe_halt | 1 | | | WARNING:at_kernel/rcu/tree.c:#rcu_irq_enter | 1 | | | RIP:rcu_irq_enter | 1 | | | WARNING:at_kernel/rcu/tree.c:#rcu_nmi_enter | 1 | | | RIP:rcu_nmi_enter | 1 | | | WARNING:at_kernel/rcu/tree.c:#rcu_nmi_exit | 1 | | | RIP:rcu_nmi_exit | 1 | | | WARNING:at_kernel/rcu/tree.c:#rcu_eqs_exit | 1 | | | RIP:rcu_eqs_exit | 1 | | | BUG:scheduling_while_atomic | 1 | | | kernel_BUG_at_security/keys/keyring.c | 0 | 12 | | invalid_opcode:#[##] | 0 | 12 | | RIP:__key_link_begin | 0 | 12 | | Kernel_panic-not_syncing:Fatal_exception | 0 | 12 | +-------------------------------------------------+------------+------------+ If you fix the issue, kindly add following tag Reported-by: kernel test robot [ 34.431436] kernel BUG at security/keys/keyring.c:1245! [ 34.432866] invalid opcode: 0000 [#1] SMP PTI [ 34.433774] CPU: 1 PID: 2592 Comm: trinity-c7 Not tainted 5.2.0-rc1-00017-gf771fde820519 #1 [ 34.435431] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.10.2-1 04/01/2014 [ 34.437099] RIP: 0010:__key_link_begin+0x88/0xa0 [ 34.438538] Code: 5d 41 5c c3 0f b7 43 76 48 89 df 48 8d 70 04 e8 de dd ff ff 85 c0 79 dd 48 89 ef 89 44 24 04 e8 be f3 0b 00 8b 44 24 04 eb d1 <0f> 0b 0f 0b b8 80 ff ff ff eb c6 66 66 2e 0f 1f 84 00 00 00 00 00 [ 34.445962] RSP: 0018:ffffa91140d0fde8 EFLAGS: 00010246 [ 34.447932] RAX: 0000000000000000 RBX: ffff99787dd0f401 RCX: ffffa91140d0fe31 [ 34.450598] RDX: ffffa91140d0fe28 RSI: ffffa91140d0fe30 RDI: ffff99787dd0f400 [ 34.453125] RBP: ffff997895e78a40 R08: 0000000000000000 R09: ffff997907c03980 [ 34.455524] R10: ffff99787dd0f400 R11: 00000000d0f9514f R12: 00000000ffffffff [ 34.458190] R13: ffff99793fde86c0 R14: ffffffffffffffec R15: 0000000000000008 [ 34.460708] FS: 00007f06eb481740(0000) GS:ffff99793fd00000(0000) knlGS:0000000000000000 [ 34.463433] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 34.465468] CR2: 00007f06e97613cc CR3: 000000007a9fe000 CR4: 00000000000406e0 [ 34.467888] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 34.470335] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 34.472748] Call Trace: [ 34.473852] key_create_or_update+0x211/0x4b0 [ 34.475269] __x64_sys_add_key+0x101/0x200 [ 34.476740] do_syscall_64+0x5b/0x1e0 [ 34.477975] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 34.479678] RIP: 0033:0x7f06ead8e1c9 [ 34.482108] Code: 01 00 48 81 c4 80 00 00 00 e9 f1 fe ff ff 0f 1f 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d 97 dc 2c 00 f7 d8 64 89 01 48 [ 34.490151] RSP: 002b:00007ffd0cc33628 EFLAGS: 00000246 ORIG_RAX: 00000000000000f8 [ 34.493640] RAX: ffffffffffffffda RBX: 00000000000000f8 RCX: 00007f06ead8e1c9 [ 34.497038] RDX: 00007f06eb342000 RSI: 0000000000400000 RDI: 000000000043c5ae [ 34.500296] RBP: 00007f06eb449000 R08: ffffffffffffffff R09: fffffffffffffffb [ 34.503601] R10: 0000000000000008 R11: 0000000000000246 R12: 00007f06eb449058 [ 34.506005] R13: 00007f06eb4816b0 R14: 0000000000000000 R15: 00007f06eb449000 [ 34.508374] Modules linked in: af_key mpls_router ip_tunnel vmw_vsock_vmci_transport vsock vmw_vmci ieee802154_socket ieee802154 hidp cmtp kernelcapi bnep rfcomm bluetooth ecdh_generic ecc rfkill can_bcm can_raw can pptp gre l2tp_ppp l2tp_netlink l2tp_core ip6_udp_tunnel udp_tunnel pppoe pppox ppp_generic slhc crypto_user nfnetlink scsi_transport_iscsi dccp_ipv6 atm sctp libcrc32c dccp_ipv4 dccp sr_mod cdrom sg ppdev crct10dif_pclmul crc32_pclmul crc32c_intel ghash_clmulni_intel aesni_intel crypto_simd cryptd glue_helper joydev ata_generic pata_acpi serio_raw pcspkr parport_pc parport floppy bochs_drm ttm drm_kms_helper syscopyarea sysfillrect sysimgblt fb_sys_fops drm ata_piix libata i2c_piix4 ip_tables [ 34.526027] ---[ end trace cfce0f246614c04a ]--- To reproduce: # build kernel cd linux cp config-5.2.0-rc1-00017-gf771fde820519 .config make HOSTCC=gcc-7 CC=gcc-7 ARCH=x86_64 olddefconfig prepare modules_prepare bzImage git clone https://github.com/intel/lkp-tests.git cd lkp-tests bin/lkp qemu -k job-script # job-script is attached in this email Thanks, Rong Chen