On Wed, Aug 24, 2022 at 7:55 PM kernel test robot <yujie.liu@xxxxxxxxx> wrote:
>
> Greeting,
>
> FYI, we noticed the following commit (built with clang-16):
>
> commit: d88f8edb095214f8c36eeec6b89cebcfcbe3ea62 ("mm: multi-gen LRU: optimize multiple memcgs")
> https://github.com/steev/linux lenovo-x13s-5.19.0
>
> in testcase: boot
>
> 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):
>
>
> [ 5.440406][ T1] general protection fault, probably for non-canonical address 0xe686464b00000166: 0000 [#1] KASAN PTI
> [ 5.441841][ T1] KASAN: maybe wild-memory-access in range [0x3432525800000b30-0x3432525800000b37]
> [ 5.443045][ T1] CPU: 0 PID: 1 Comm: swapper Tainted: G T 5.19.0-00144-gd88f8edb0952 #1
> [ 5.443471][ T1] RIP: 0010:drm_atomic_helper_check_modeset+0x59/0x2c80
> [ 5.443471][ T1] Code: 03 48 89 85 20 ff ff ff 42 80 3c 20 00 74 08 4c 89 f7 e8 7a a0 b6 fe 48 89 5d a8 bb 30 08 00 00 49 03 1e 48 89 d8 48 c1 e8 03 <42> 0f b6 04 20 84 c0 0f 85 b6 2a 00 00 83 3b 00 4c 89 b5 58 ff ff
> [ 5.443471][ T1] RSP: 0018:ffffc9000001f580 EFLAGS: 00010206
> [ 5.443471][ T1] RAX: 06864a4b00000166 RBX: 3432525800000b30 RCX: ffffc9000001f890
> [ 5.443471][ T1] RDX: dffffc0000000000 RSI: ffffc9000001f888 RDI: ffffc9000001f888
> [ 5.443471][ T1] RBP: ffffc9000001f6c0 R08: ffff88811d82c800 R09: ffffc9000001f898
> [ 5.443471][ T1] R10: ffffc9000001f88c R11: ffffffff82b8a800 R12: dffffc0000000000
> [ 5.443471][ T1] R13: 1ffff92000003f13 R14: ffffc9000001f890 R15: 0000000000000014
> [ 5.443471][ T1] FS: 0000000000000000(0000) GS:ffffffff880c6000(0000) knlGS:0000000000000000
> [ 5.443471][ T1] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> [ 5.443471][ T1] CR2: 00007f6aae86f480 CR3: 0000000008036000 CR4: 00000000000406f0
> [ 5.443471][ T1] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> [ 5.443471][ T1] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
> [ 5.443471][ T1] Call Trace:
> [ 5.443471][ T1] <TASK>
> [ 5.443471][ T1] ? validate_chain+0x1379/0x5b80
> [ 5.443471][ T1] drm_atomic_helper_check+0x18/0x100
> [ 5.443471][ T1] drm_get_format_info+0x67/0x180
> [ 5.443471][ T1] drm_internal_framebuffer_create+0x280/0x19c0
> [ 5.443471][ T1] drm_mode_addfb2+0x9b/0x300
> [ 5.443471][ T1] drm_mode_addfb+0x25d/0x580
> [ 5.443471][ T1] drm_client_framebuffer_create+0x412/0x8c0
> [ 5.443471][ T1] drm_fb_helper_generic_probe+0x191/0x980
> [ 5.443471][ T1] ? __kasan_check_write+0x14/0x40
> [ 5.443471][ T1] ? __mutex_unlock_slowpath+0x1d7/0x740
> [ 5.443471][ T1] __drm_fb_helper_initial_config_and_unlock+0x1159/0x1b80
> [ 5.443471][ T1] drm_fbdev_client_hotplug+0x547/0x740
> [ 5.443471][ T1] drm_fbdev_generic_setup+0x13b/0x3c0
> [ 5.443471][ T1] vkms_init+0x4b6/0x640
> [ 5.443471][ T1] ? vgem_init+0x240/0x240
> [ 5.443471][ T1] do_one_initcall+0x16d/0x440
> [ 5.443471][ T1] ? vgem_init+0x240/0x240
> [ 5.443471][ T1] do_initcall_level+0x1a3/0x280
> [ 5.443471][ T1] do_initcalls+0x4b/0x80
> [ 5.443471][ T1] do_basic_setup+0x69/0x80
> [ 5.443471][ T1] kernel_init_freeable+0xe2/0x180
> [ 5.443471][ T1] ? rest_init+0x140/0x140
> [ 5.443471][ T1] kernel_init+0x18/0x1c0
> [ 5.443471][ T1] ? rest_init+0x140/0x140
> [ 5.443471][ T1] ret_from_fork+0x22/0x30
> [ 5.443471][ T1] </TASK>
> [ 5.443471][ T1] Modules linked in:
> [ 5.476918][ T1] ---[ end trace 0000000000000000 ]---
> [ 5.477623][ T1] RIP: 0010:drm_atomic_helper_check_modeset+0x59/0x2c80
> [ 5.478507][ T1] Code: 03 48 89 85 20 ff ff ff 42 80 3c 20 00 74 08 4c 89 f7 e8 7a a0 b6 fe 48 89 5d a8 bb 30 08 00 00 49 03 1e 48 89 d8 48 c1 e8 03 <42> 0f b6 04 20 84 c0 0f 85 b6 2a 00 00 83 3b 00 4c 89 b5 58 ff ff
> [ 5.481043][ T1] RSP: 0018:ffffc9000001f580 EFLAGS: 00010206
> [ 5.481851][ T1] RAX: 06864a4b00000166 RBX: 3432525800000b30 RCX: ffffc9000001f890
> [ 5.482887][ T1] RDX: dffffc0000000000 RSI: ffffc9000001f888 RDI: ffffc9000001f888
> [ 5.483950][ T1] RBP: ffffc9000001f6c0 R08: ffff88811d82c800 R09: ffffc9000001f898
> [ 5.484993][ T1] R10: ffffc9000001f88c R11: ffffffff82b8a800 R12: dffffc0000000000
> [ 5.486020][ T1] R13: 1ffff92000003f13 R14: ffffc9000001f890 R15: 0000000000000014
> [ 5.487054][ T1] FS: 0000000000000000(0000) GS:ffffffff880c6000(0000) knlGS:0000000000000000
> [ 5.488258][ T1] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> [ 5.489116][ T1] CR2: 00007f6aae86f480 CR3: 0000000008036000 CR4: 00000000000406f0
> [ 5.490109][ T1] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> [ 5.491150][ T1] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
> [ 5.492241][ T1] Kernel panic - not syncing: Fatal exception
> [ 5.493037][ T1] Kernel Offset: disabled
>
>
> =========================================================================================
> tbox_group/testcase/rootfs/kconfig/compiler/sleep:
> vm-snb/boot/yocto-x86_64-minimal-20190520.cgz/x86_64-randconfig-a003-20220801/clang-16/1
>
> commit:
> fe2bb20302a87cfeda355e4be3cc3029478a5214
> d88f8edb095214f8c36eeec6b89cebcfcbe3ea62
>
> fe2bb20302a87cfe d88f8edb095214f8c36eeec6b89
> ---------------- ---------------------------
> fail:runs %reproduction fail:runs
> | | |
> :30 133% 40:40 dmesg.Kernel_panic-not_syncing:Fatal_exception
> :30 133% 40:40 dmesg.RIP:drm_atomic_helper_check_modeset
>
>
> The kconfig of this boot test has "# CONFIG_LRU_GEN is not set"
This means the aforementioned commit was not built at all. So it
shouldn't cause the crash.
> We also tried to enable CONFIG_LRU_GEN and re-test it, then boot is successful.
Nor should it fix the crash.
> https://github.com/steev/linux lenovo-x13s-5.19.0
This tree has other patches. In case you want to make sure MGLRU has
nothing to do with the crash, please try the patchset on top of the
official 5.19.0 and try again.
Thanks.
