Greeting, FYI, we noticed the following commit (built with gcc-9): commit: cb1c81467af355829a4a9d8fa3f92ffab355d93c ("drm/ttm: flip the switch for driver allocated resources v2") git://anongit.freedesktop.org/drm/drm-misc drm-misc-next in testcase: rcutorture version: with following parameters: runtime: 300s test: cpuhotplug torture_type: srcu test-description: rcutorture is rcutorture kernel module load/unload test. test-url: https://www.kernel.org/doc/Documentation/RCU/torture.txt on test machine: qemu-system-x86_64 -enable-kvm -cpu SandyBridge -smp 2 -m 16G caused below changes (please refer to attached dmesg/kmsg for entire log/backtrace): +---------------------------------------------+------------+------------+ | | d3bcb4b02f | cb1c81467a | +---------------------------------------------+------------+------------+ | boot_successes | 6 | 0 | | boot_failures | 0 | 6 | | BUG:unable_to_handle_page_fault_for_address | 0 | 6 | | Oops:#[##] | 0 | 6 | | RIP:ttm_bo_handle_move_mem[ttm] | 0 | 6 | | Kernel_panic-not_syncing:Fatal_exception | 0 | 6 | +---------------------------------------------+------------+------------+ If you fix the issue, kindly add following tag Reported-by: kernel test robot <oliver.sang(a)intel.com&gt; [ 9.007194] BUG: unable to handle page fault for address: 0000030000000410 [ 9.007197] #PF: supervisor read access in kernel mode [ 9.007199] #PF: error_code(0x0000) - not-present page [ 9.007201] PGD 0 P4D 0 [ 9.007205] Oops: 0000 [#1] SMP PTI [ 9.007209] CPU: 0 PID: 174 Comm: systemd-udevd Not tainted 5.13.0-rc3-00848-gcb1c81467af3 #1 [ 9.007212] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014 [ 9.007214] RIP: 0010:ttm_bo_handle_move_mem (kbuild/src/consumer/include/drm/ttm/ttm_device.h:287 kbuild/src/consumer/drivers/gpu/drm/ttm/ttm_bo.c:171) ttm [ 9.007225] Code: 48 89 fb 48 83 ec 10 48 8b 87 68 01 00 00 4c 8b af 48 01 00 00 89 54 24 04 48 63 40 10 49 8b 84 c5 80 00 00 00 48 89 44 24 08 <48> 63 46 10 49 8b ac c5 80 00 00 00 e8 ad fe ff ff 80 7d 01 00 0f All code ======== 0: 48 89 fb mov %rdi,%rbx 3: 48 83 ec 10 sub $0x10,%rsp 7: 48 8b 87 68 01 00 00 mov 0x168(%rdi),%rax e: 4c 8b af 48 01 00 00 mov 0x148(%rdi),%r13 15: 89 54 24 04 mov %edx,0x4(%rsp) 19: 48 63 40 10 movslq 0x10(%rax),%rax 1d: 49 8b 84 c5 80 00 00 mov 0x80(%r13,%rax,8),%rax 24: 00 25: 48 89 44 24 08 mov %rax,0x8(%rsp) 2a:* 48 63 46 10 movslq 0x10(%rsi),%rax <-- trapping instruction 2e: 49 8b ac c5 80 00 00 mov 0x80(%r13,%rax,8),%rbp 35: 00 36: e8 ad fe ff ff callq 0xfffffffffffffee8 3b: 80 7d 01 00 cmpb $0x0,0x1(%rbp) 3f: 0f .byte 0xf Code starting with the faulting instruction =========================================== 0: 48 63 46 10 movslq 0x10(%rsi),%rax 4: 49 8b ac c5 80 00 00 mov 0x80(%r13,%rax,8),%rbp b: 00 c: e8 ad fe ff ff callq 0xfffffffffffffebe 11: 80 7d 01 00 cmpb $0x0,0x1(%rbp) 15: 0f .byte 0xf [ 9.007228] RSP: 0018:ffffba428019f690 EFLAGS: 00010286 [ 9.007230] RAX: ffff9682d2205028 RBX: ffff9684f7ea2000 RCX: ffffba428019f750 [ 9.007232] RDX: 0000000000000000 RSI: 0000030000000400 RDI: ffff9684f7ea2000 [ 9.007234] RBP: ffffba428019f6f8 R08: ffffba428019f6f8 R09: ffff9684f90eac70 [ 9.007235] R10: ffff9684f90eacf0 R11: 0000000000000006 R12: ffffba428019f750 [ 9.007237] R13: ffff9682d2205010 R14: ffffba428019f6f8 R15: 0000030000000400 [ 9.007239] FS: 00007fc0f709ed40(0000) GS:ffff9685afc00000(0000) knlGS:0000000000000000 [ 9.007241] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 9.007243] CR2: 0000030000000410 CR3: 0000000378520000 CR4: 00000000000406f0 [ 9.007251] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 9.007253] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 9.007254] Call Trace: [ 9.007260] ttm_bo_validate (kbuild/src/consumer/drivers/gpu/drm/ttm/ttm_bo.c:883 kbuild/src/consumer/drivers/gpu/drm/ttm/ttm_bo.c:962) ttm [ 9.007268] drm_gem_vram_pin_locked (kbuild/src/consumer/drivers/gpu/drm/drm_gem_vram_helper.c:293) drm_vram_helper [ 9.007275] drm_gem_vram_pin (kbuild/src/consumer/drivers/gpu/drm/drm_gem_vram_helper.c:332) drm_vram_helper [ 9.007279] drm_gem_vram_plane_helper_prepare_fb (kbuild/src/consumer/drivers/gpu/drm/drm_gem_vram_helper.c:679) drm_vram_helper [ 9.007284] drm_atomic_helper_prepare_planes (kbuild/src/consumer/drivers/gpu/drm/drm_atomic_helper.c:2414 kbuild/src/consumer/drivers/gpu/drm/drm_atomic_helper.c:2381) drm_kms_helper [ 9.007313] drm_atomic_helper_commit (kbuild/src/consumer/drivers/gpu/drm/drm_atomic_helper.c:1839 kbuild/src/consumer/drivers/gpu/drm/drm_atomic_helper.c:1816) drm_kms_helper [ 9.007336] drm_client_modeset_commit_atomic (kbuild/src/consumer/drivers/gpu/drm/drm_client_modeset.c:1043) drm [ 9.007386] drm_client_modeset_commit_locked (kbuild/src/consumer/drivers/gpu/drm/drm_client_modeset.c:1146) drm [ 9.007416] drm_client_modeset_commit (kbuild/src/consumer/drivers/gpu/drm/drm_client_modeset.c:1174) drm [ 9.007465] __drm_fb_helper_restore_fbdev_mode_unlocked (kbuild/src/consumer/drivers/gpu/drm/drm_fb_helper.c:256 kbuild/src/consumer/drivers/gpu/drm/drm_fb_helper.c:231) drm_kms_helper [ 9.007484] drm_fb_helper_set_par (kbuild/src/consumer/drivers/gpu/drm/drm_fb_helper.c:1405) drm_kms_helper [ 9.007504] fbcon_init (kbuild/src/consumer/drivers/video/fbdev/core/fbcon.c:1127) [ 9.007532] visual_init (kbuild/src/consumer/drivers/tty/vt/vt.c:1075) [ 9.007539] do_bind_con_driver (kbuild/src/consumer/drivers/tty/vt/vt.c:3664) [ 9.007542] do_take_over_console (kbuild/src/consumer/drivers/tty/vt/vt.c:4242) [ 9.007546] do_fbcon_takeover (kbuild/src/consumer/drivers/video/fbdev/core/fbcon.c:555) [ 9.007549] register_framebuffer (kbuild/src/consumer/include/linux/fb.h:641 kbuild/src/consumer/drivers/video/fbdev/core/fbmem.c:1650 kbuild/src/consumer/drivers/video/fbdev/core/fbmem.c:1817) [ 9.007555] __drm_fb_helper_initial_config_and_unlock (kbuild/src/consumer/drivers/gpu/drm/drm_fb_helper.c:1855) drm_kms_helper [ 9.007574] drm_fbdev_client_hotplug (kbuild/src/consumer/drivers/gpu/drm/drm_fb_helper.c:1921 kbuild/src/consumer/drivers/gpu/drm/drm_fb_helper.c:1913 kbuild/src/consumer/drivers/gpu/drm/drm_fb_helper.c:2423) drm_kms_helper [ 9.007592] drm_fbdev_generic_setup (kbuild/src/consumer/drivers/gpu/drm/drm_fb_helper.c:2510) drm_kms_helper [ 9.007610] bochs_pci_probe (kbuild/src/consumer/drivers/gpu/drm/bochs/bochs_drv.c:136 kbuild/src/consumer/drivers/gpu/drm/bochs/bochs_drv.c:100) bochs_drm [ 9.007616] local_pci_probe (kbuild/src/consumer/drivers/pci/pci-driver.c:309) [ 9.007622] ? __cond_resched (kbuild/src/consumer/kernel/sched/core.c:6994) [ 9.007628] pci_device_probe (kbuild/src/consumer/drivers/pci/pci-driver.c:366 kbuild/src/consumer/drivers/pci/pci-driver.c:391 kbuild/src/consumer/drivers/pci/pci-driver.c:434) [ 9.007631] really_probe (kbuild/src/consumer/drivers/base/dd.c:576) [ 9.007638] driver_probe_device (kbuild/src/consumer/drivers/base/dd.c:763) [ 9.007643] device_driver_attach (kbuild/src/consumer/drivers/base/dd.c:1039) [ 9.007647] __driver_attach (kbuild/src/consumer/drivers/base/dd.c:1119) [ 9.007651] ? device_driver_attach (kbuild/src/consumer/drivers/base/dd.c:1071) [ 9.007654] ? device_driver_attach (kbuild/src/consumer/drivers/base/dd.c:1071) [ 9.007658] bus_for_each_dev (kbuild/src/consumer/drivers/base/bus.c:305) [ 9.007663] bus_add_driver (kbuild/src/consumer/drivers/base/bus.c:623) [ 9.007667] driver_register (kbuild/src/consumer/drivers/base/driver.c:171) [ 9.007671] ? 0xffffffffc067e000 [ 9.007673] do_one_initcall (kbuild/src/consumer/init/main.c:1249) [ 9.007681] ? __cond_resched (kbuild/src/consumer/kernel/sched/core.c:6994) [ 9.007684] ? kmem_cache_alloc_trace (kbuild/src/consumer/mm/slab.h:499 kbuild/src/consumer/mm/slub.c:2834 kbuild/src/consumer/mm/slub.c:2921 kbuild/src/consumer/mm/slub.c:2938) [ 9.007690] do_init_module (kbuild/src/consumer/kernel/module.c:3664) [ 9.007697] load_module (kbuild/src/consumer/kernel/module.c:4064) [ 9.007701] ? __kernel_read (kbuild/src/consumer/fs/read_write.c:454 (discriminator 1)) [ 9.007708] ? __do_sys_finit_module (kbuild/src/consumer/kernel/module.c:4155) [ 9.007711] __do_sys_finit_module (kbuild/src/consumer/kernel/module.c:4155) [ 9.007717] do_syscall_64 (kbuild/src/consumer/arch/x86/entry/common.c:47) [ 9.007722] entry_SYSCALL_64_after_hwframe (kbuild/src/consumer/arch/x86/entry/entry_64.S:112) [ 9.007726] RIP: 0033:0x7fc0f7888f59 [ 9.007729] Code: 00 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 07 6f 0c 00 f7 d8 64 89 01 48 All code ======== 0: 00 c3 add %al,%bl 2: 66 2e 0f 1f 84 00 00 nopw %cs:0x0(%rax,%rax,1) 9: 00 00 00 c: 0f 1f 44 00 00 nopl 0x0(%rax,%rax,1) 11: 48 89 f8 mov %rdi,%rax 14: 48 89 f7 mov %rsi,%rdi 17: 48 89 d6 mov %rdx,%rsi 1a: 48 89 ca mov %rcx,%rdx 1d: 4d 89 c2 mov %r8,%r10 20: 4d 89 c8 mov %r9,%r8 23: 4c 8b 4c 24 08 mov 0x8(%rsp),%r9 28: 0f 05 syscall 2a:* 48 3d 01 f0 ff ff cmp $0xfffffffffffff001,%rax <-- trapping instruction 30: 73 01 jae 0x33 32: c3 retq 33: 48 8b 0d 07 6f 0c 00 mov 0xc6f07(%rip),%rcx # 0xc6f41 3a: f7 d8 neg %eax 3c: 64 89 01 mov %eax,%fs:(%rcx) 3f: 48 rex.W Code starting with the faulting instruction =========================================== 0: 48 3d 01 f0 ff ff cmp $0xfffffffffffff001,%rax 6: 73 01 jae 0x9 8: c3 retq 9: 48 8b 0d 07 6f 0c 00 mov 0xc6f07(%rip),%rcx # 0xc6f17 10: f7 d8 neg %eax 12: 64 89 01 mov %eax,%fs:(%rcx) 15: 48 rex.W To reproduce: # build kernel cd linux cp config-5.13.0-rc3-00848-gcb1c81467af3 .config make HOSTCC=gcc-9 CC=gcc-9 ARCH=x86_64 olddefconfig prepare modules_prepare bzImage git clone https://github.com/intel/lkp-tests.git cd lkp-tests bin/lkp qemu -k <bzImage> job-script # job-script is attached in this email --- 0DAY/LKP+ Test Infrastructure Open Source Technology Center https://lists.01.org/hyperkitty/list/lkp@lists.01.org Intel Corporation Thanks, Oliver Sang