Hi all, In my Linux box, I see that kernel crashes for a known test case. In the first attempt when I run that test case I landed into “general protection fault: 0000 [#1] SMP" .. Next I rebooted and ran the same test , but now it resulted the “Oops: 0002 [#1] SMP". In both cases the call trace looks exactly same and RIP points to “native_queued_spin_lock_slowpath+0xfe/0x170".. So, can some one clarify me , what are the difference between “general protection fault: 0000 [#1] SMP" & “Oops: 0002 [#1] SMP". In which scenario kernel throws “Oops: 0002 [#1] SMP" Or “general protection fault: 0000 [#1] SMP".. May 16 12:06:17 test-pc kernel: [96934.528114] general protection fault: 0000 [#1] SMP May 16 12:06:17 test-pc kernel: [96934.528990] Modules linked in: dbg(OE) mcore(OE) osa(OE) cfg80211 ppdev intel_rapl intel_soc_dts_iosf intel_powerclamp coretemp kvm irqbypass punit_atom_debug cdc_acm mei_txe mei lpc_ich shpchp parport_pc mac_hid parport tpm_infineon 8250_fintek ib_iser rdma_cm iw_cm ib_cm ib_sa ib_mad ib_core ib_addr iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi autofs4 btrfs raid10 raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx xor raid6_pq libcrc32c raid1 raid0 multipath linear crct10dif_pclmul crc32_pclmul ghash_clmulni_intel aesni_intel i915 aes_x86_64 lrw gf128mul glue_helper ablk_helper cryptd igb drm_kms_helper dca syscopyarea ptp sysfillrect sysimgblt pps_core fb_sys_fops i2c_algo_bit drm ahci libahci fjes video [last unloaded: osa] May 16 12:06:17 test-pc kernel: [96934.537343] CPU: 2 PID: 5457 Comm: multi/complete Tainted: G OE 4.4.0-66-generic #87-Ubuntu May 16 12:06:17 test-pc kernel: [96934.538715] Hardware name: Supermicro Super Server/X10SDV-TLN4F, BIOS 1.0b 09/09/2015 May 16 12:06:17 test-pc kernel: [96934.540146] task: ffff880139d02640 ti: ffff880034fe0000 task.ti: ffff880034fe0000 May 16 12:06:17 test-pc kernel: [96934.541632] RIP: 0010:[<ffffffff810cafee>] [<ffffffff810cafee>] native_queued_spin_lock_slowpath+0xfe/0x170 May 16 12:06:17 test-pc kernel: [96934.543224] RSP: 0018:ffff880034fe3e08 EFLAGS: 00010002 May 16 12:06:17 test-pc kernel: [96934.544837] RAX: 0000000000002be1 RBX: 0000000000000082 RCX: 0004b8107b8cc138 May 16 12:06:17 test-pc kernel: [96934.546511] RDX: ffff88013fd17900 RSI: 00000000000c0000 RDI: ffff8800b35fbb88 May 16 12:06:17 test-pc kernel: [96934.548213] RBP: ffff880034fe3e08 R08: 0000000000000101 R09: 0000000180200019 May 16 12:06:17 test-pc kernel: [96934.549949] R10: ffff8800340c9680 R11: 0000000000000001 R12: ffff8800b35fbb88 May 16 12:06:17 test-pc kernel: [96934.551713] R13: 0000000000000246 R14: 0000000000000001 R15: ffff8800340c9d00 May 16 12:06:17 test-pc kernel: [96934.553501] FS: 0000000000000000(0000) GS:ffff88013fd00000(0000) knlGS:0000000000000000 May 16 12:06:17 test-pc kernel: [96934.555346] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b May 16 12:06:17 test-pc kernel: [96934.557216] CR2: 00007ffe8614d938 CR3: 00000000b35ef000 CR4: 00000000001006e0 May 16 12:06:17 test-pc kernel: [96934.559146] Stack: May 16 12:06:17 test-pc kernel: [96934.561081] ffff880034fe3e20 ffffffff8183c427 ffff8800b35fbb70 ffff880034fe3e50 May 16 12:06:17 test-pc kernel: [96934.563133] ffffffffc0606812 ffff880035581cc0 ffff8800b1eb5ec8 0000000000000246 May 16 12:06:17 test-pc kernel: [96934.565220] ffff8800b1eb5ef0 ffff880034fe3e60 ffffffffc06aa2a4 ffff880034fe3ea May 16 12:06:17 test-pc kernel: [96934.567347] Call Trace: May 16 12:06:17 test-pc kernel: [96934.569475] [<ffffffff8183c427>] _raw_spin_lock_irqsave+0x37/0x40 May 16 12:06:17 test-pc kernel: [96934.571686] [<ffffffffc0606812>] event_raise+0x22/0x60 [osa] May 16 12:06:17 test-pc kernel: [96934.573935] [<ffffffffc06aa2a4>] multi_q_completed_one_buffer+0x34/0x40 [mcore] May 16 12:06:17 test-pc kernel: [96934.576236] [<ffffffffc06a919e>] complete_thread+0x7e/0x110 [mcore] May 16 12:06:17 test-pc kernel: [96934.578567] [<ffffffffc0606a10>] ? thread_should_stop+0x10/0x10 [osa] May 16 12:06:17 test-pc kernel: [96934.580934] [<ffffffffc0606a26>] thread_func+0x16/0x50 [osa] May 16 12:06:17 test-pc kernel: [96934.583326] [<ffffffffc0606a10>] ? thread_should_stop+0x10/0x10 [osa] May 16 12:06:17 test-pc kernel: [96934.585762] [<ffffffff810a0ba8>] kthread+0xd8/0xf0 May 16 12:06:17 test-pc kernel: [96934.588219] [<ffffffff810a0ad0>] ? kthread_create_on_node+0x1e0/0x1e0 May 16 12:06:17 test-pc kernel: [96934.590724] [<ffffffff8183c98f>] ret_from_fork+0x3f/0x70 May 16 12:06:17 test-pc kernel: [96934.593251] [<ffffffff810a0ad0>] ? kthread_create_on_node+0x1e0/0x1e0 May 16 12:06:17 test-pc kernel: [96934.595822] Code: 87 47 02 c1 e0 10 85 c0 74 38 48 89 c1 c1 e8 12 48 c1 e9 0c 83 e8 01 83 e1 30 48 98 48 81 c1 00 79 01 00 48 03 0c c5 40 75 f3 81 <48> 89 11 8b 42 08 85 c0 75 0d f3 90 8b 42 08 85 c0 74 f7 eb 02 May 16 12:06:17 test-pc kernel: [96934.601479] RIP [<ffffffff810cafee>] native_queued_spin_lock_slowpath+0xfe/0x17 May 16 12:06:17 test-pc kernel: [96934.604306] RSP <ffff880034fe3e08> May 16 12:06:17 test-pc kernel: [96934.617229] ---[ end trace 0b60bd63d72bdffa ]--- May 16 12:59:22 test-pc kernel: [ 3011.360710] BUG: unable to handle kernel paging request at 0000000000017900 May 16 12:59:22 test-pc kernel: [ 3011.361623] IP: [<ffffffff810cafee>] native_queued_spin_lock_slowpath+0xfe/0x170 May 16 12:59:22 test-pc kernel: [ 3011.362547] PGD May 16 12:59:22 test-pc kernel: [ 3011.363419] Oops: 0002 [#1] SMP May 16 12:59:22 test-pc kernel: [ 3011.364298] Modules linked in: dbg(OE) mcore(OE) osa(OE) cfg80211 ppdev intel_rapl intel_soc_dts_iosf intel_powerclamp coretemp kvm irqbypass punit_atom_debug cdc_acm mei_txe mei lpc_ich shpchp parport_pc mac_hid parport tpm_infineon 8250_fintek ib_iser rdma_cm iw_cm ib_cm ib_sa ib_mad ib_core ib_addr iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi autofs4 btrfs raid10 raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx xor raid6_pq libcrc32c raid1 raid0 multipath linear crct10dif_pclmul crc32_pclmul ghash_clmulni_intel aesni_intel i915 aes_x86_64 lrw gf128mul glue_helper ablk_helper cryptd igb drm_kms_helper dca syscopyarea ptp sysfillrect sysimgblt pps_core fb_sys_fops i2c_algo_bit drm ahci libahci fjes video [last unloaded: osa] May 16 12:59:22 test-pc kernel: [ 3011.373097] CPU: 1 PID: 4103 Comm: multi/complete Tainted: G OE 4.4.0-66-generic #87-Ubunt May 16 12:59:22 test-pc kernel: [ 3011.374622] Hardware name: Supermicro Super Server/X10SDV-TLN4F, BIOS 1.0b 09/09/2015 May 16 12:59:22 test-pc kernel: [ 3011.376203] task: ffff8800b3b972c0 ti: ffff8800b1cb0000 task.ti: ffff8800b1cb0000 May 16 12:59:22 test-pc kernel: [ 3011.377825] RIP: 0010:[<ffffffff810cafee>] [<ffffffff810cafee>] native_queued_spin_lock_slowpath+0xfe/0x170 May 16 12:59:22 test-pc kernel: [ 3011.379575] RSP: 0018:ffff8800b1cb3e08 EFLAGS: 00010006 May 16 12:59:22 test-pc kernel: [ 3011.381324] RAX: 0000000000000e8c RBX: 0000000000000082 RCX: 000000000001790 May 16 12:59:22 test-pc kernel: [ 3011.383141] RDX: ffff88013fc97900 RSI: 0000000000080000 RDI: ffff88013a347b88 May 16 12:59:22 test-pc kernel: [ 3011.384997] RBP: ffff8800b1cb3e08 R08: 0000000000000101 R09: 0000000180200003 May 16 12:59:22 test-pc kernel: [ 3011.386878] R10: ffff880034fb4580 R11: 0000000000000001 R12: ffff88013a347b88 May 16 12:59:22 test-pc kernel: [ 3011.388792] R13: 0000000000000246 R14: 0000000000000001 R15: ffff880034fb4100 May 16 12:59:22 test-pc kernel: [ 3011.390726] FS: 0000000000000000(0000) GS:ffff88013fc80000(0000) knlGS:0000000000000000 May 16 12:59:22 test-pc kernel: [ 3011.392722] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b May 16 12:59:22 test-pc kernel: [ 3011.394738] CR2: 0000000000017900 CR3: 0000000001e0a000 CR4: 00000000001006e0 May 16 12:59:22 test-pc kernel: [ 3011.396819] Stack: May 16 12:59:22 test-pc kernel: [ 3011.398896] ffff8800b1cb3e20 ffffffff8183c427 ffff88013a347b70 ffff8800b1cb3e50 May 16 12:59:22 test-pc kernel: [ 3011.401093] ffffffffc0604812 ffff8800b49f46c0 ffff880034a238c8 0000000000000246 May 16 12:59:22 test-pc kernel: [ 3011.403327] ffff880034a238f0 ffff8800b1cb3e60 ffffffffc06b72a4 ffff8800b1cb3ea8 May 16 12:59:22 test-pc kernel: [ 3011.405602] Call Trace: May 16 12:59:22 test-pc kernel: [ 3011.407892] [<ffffffff8183c427>] _raw_spin_lock_irqsave+0x37/0x40 May 16 12:59:22 test-pc kernel: [ 3011.410256] [<ffffffffc0604812>] event_raise+0x22/0x60 [osa] May 16 12:59:22 test-pc kernel: [ 3011.412652] [<ffffffffc06b72a4>] multi_q_completed_one_buffer+0x34/0x40 [mcore] May 16 12:59:22 test-pc kernel: [ 3011.415103] [<ffffffffc06b619e>] complete_thread+0x7e/0x110 [mcore] May 16 12:59:22 test-pc kernel: [ 3011.417584] [<ffffffffc0604a10>] ? thread_should_stop+0x10/0x10 [osa] May 16 12:59:22 test-pc kernel: [ 3011.420113] [<ffffffffc0604a26>] thread_func+0x16/0x50 [osa May 16 12:59:22 test-pc kernel: [ 3011.422654] [<ffffffffc0604a10>] ? thread_should_stop+0x10/0x10 [osa] May 16 12:59:22 test-pc kernel: [ 3011.425241] [<ffffffff810a0ba8>] kthread+0xd8/0xf0 May 16 12:59:22 test-pc kernel: [ 3011.427857] [<ffffffff810a0ad0>] ? kthread_create_on_node+0x1e0/0x1e0 May 16 12:59:22 test-pc kernel: [ 3011.430511] [<ffffffff8183c98f>] ret_from_fork+0x3f/0x70 May 16 12:59:22 test-pc kernel: [ 3011.433185] [<ffffffff810a0ad0>] ? kthread_create_on_node+0x1e0/0x1e0 May 16 12:59:22 test-pc kernel: [ 3011.435915] Code: 87 47 02 c1 e0 10 85 c0 74 38 48 89 c1 c1 e8 12 48 c1 e9 0c 83 e8 01 83 e1 30 48 98 48 81 c1 00 79 01 00 48 03 0c c5 40 75 f3 81 <48> 89 11 8b 42 08 85 c0 75 0d f3 90 8b 42 08 85 c0 74 f7 eb 02 May 16 12:59:22 test-pc kernel: [ 3011.441870] RIP [<ffffffff810cafee>] native_queued_spin_lock_slowpath+0xfe/0x170 May 16 12:59:22 test-pc kernel: [ 3011.444858] RSP <ffff8800b1cb3e08> May 16 12:59:22 test-pc kernel: [ 3011.447817] CR2: 000000000001790 May 16 12:59:22 test-pc kernel: [ 3011.460906] ---[ end trace 0337c6fc94b1cb3d ]--- Thanks