I've just updated to the head of Linus's tree (5.10-rc5) and got the following 'splat' during shutdown. Userspace is Ubuntu 20.04. rc4 rebooted fine. I'll try to bisect - but it isn't quick. David [ 49.612436] kernel BUG at mm/slub.c:304! [ 49.616407] invalid opcode: 0000 [#1] SMP PTI [ 49.620806] CPU: 4 PID: 2044 Comm: (sd-umount) Not tainted 5.10.0-rc5+ #104 [ 49.627816] Hardware name: Supermicro A1SAi/A1SRi, BIOS 1.1a 08/27/2015 [ 49.634484] RIP: 0010:__slab_free+0x1c9/0x380 [ 49.638874] Code: 41 5e 41 5f 5d c3 41 f7 46 08 00 0d 21 00 0f 85 f0 fe ff ff 4d 85 ed 0f 85 e7 fe ff ff 80 4c 24 5b 80 45 31 c0 e9 2a ff ff ff <0f> 0b 49 3b 5c 24 28 75 97 4c 89 c0 41 89 f0 44 89 fe 49 89 4c 24 [ 49.659081] RSP: 0018:ffffa69740d17ce0 EFLAGS: 00010246 [ 49.665694] RAX: ffff98444d492800 RBX: 0000000000080005 RCX: ffff98444d492000 [ 49.674227] RDX: ffff98444d492000 RSI: fffff4a184352400 RDI: ffff984440043300 [ 49.682735] RBP: ffffa69740d17d78 R08: 0000000000000001 R09: ffffffffb8a66024 [ 49.691253] R10: ffff98444d492000 R11: 0000000000000001 R12: fffff4a184352400 [ 49.699753] R13: ffff98444d492000 R14: ffff984440043300 R15: ffff98444d492000 [ 49.708230] FS: 00007f353813d980(0000) GS:ffff9847afd00000(0000) knlGS:0000000000000000 [ 49.717695] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 49.724823] CR2: 00007f3538f2f760 CR3: 000000010f6dc000 CR4: 00000000001006e0 [ 49.733369] Call Trace: [ 49.737236] ? xas_store+0x59/0x630 [ 49.742141] kfree+0x3af/0x400 [ 49.746609] ? up+0x37/0x70 [ 49.750817] ? efivarfs_destroy+0x24/0x30 [ 49.756220] efivarfs_destroy+0x24/0x30 [ 49.761435] ? efivarfs_kill_sb+0x30/0x30 [ 49.766811] __efivar_entry_iter+0xed/0x130 [ 49.772355] efivarfs_kill_sb+0x25/0x30 [ 49.777540] deactivate_locked_super+0x3b/0x80 [ 49.783360] deactivate_super+0x3e/0x50 [ 49.788554] cleanup_mnt+0x109/0x160 [ 49.793471] __cleanup_mnt+0x12/0x20 [ 49.798388] task_work_run+0x70/0xb0 [ 49.803298] exit_to_user_mode_prepare+0x14b/0x170 [ 49.809450] syscall_exit_to_user_mode+0x2d/0x150 [ 49.815522] do_syscall_64+0x45/0x90 [ 49.820471] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 49.826912] RIP: 0033:0x7f3538ff32cb [ 49.831880] Code: 8b 0c 00 f7 d8 64 89 01 48 83 c8 ff c3 66 90 f3 0f 1e fa 31 f6 e9 05 00 00 00 0f 1f 44 00 00 f3 0f 1e fa b8 a6 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d 95 8b 0c 00 f7 d8 64 89 01 48 [ 49.853650] RSP: 002b:00007ffffcd5efc8 EFLAGS: 00000206 ORIG_RAX: 00000000000000a6 [ 49.862792] RAX: 0000000000000000 RBX: 0000557eb1ea4c00 RCX: 00007f3538ff32cb [ 49.871520] RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000557eb1ea4c40 [ 49.880260] RBP: 0000000000000000 R08: 0000000000008000 R09: 00007ffffcd5e3c0 [ 49.889013] R10: 00007f353813d900 R11: 0000000000000206 R12: 0000000000000000 [ 49.897778] R13: 0000000000000000 R14: 0000000000000001 R15: 0000557eb1e9fb60 [ 49.906560] Modules linked in: nls_iso8859_1 dm_multipath scsi_dh_rdac scsi_dh_emc scsi_dh_alua ipmi_ssif intel_powerclamp coretemp kvm_intel kvm joydev input_leds ipmi_si intel_cstate ipmi_devintf ipmi_msghandler mac_hid sch_fq_codel parport_pc ppdev lp parport ip_tables x_tables autofs4 btrfs blake2b_generic zstd_compress raid10 raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx libcrc32c xor raid6_pq raid1 raid0 multipath linear ast drm_vram_helper drm_kms_helper syscopyarea sysfillrect sysimgblt fb_sys_fops cec drm_ttm_helper ttm drm gpio_ich ahci igb crct10dif_pclmul hid_generic crc32_pclmul i2c_i801 ghash_clmulni_intel aesni_intel libahci glue_helper crypto_simd i2c_ismt cryptd lpc_ich dca i2c_smbus usbhid i2c_algo_bit hid [ 49.983763] ---[ end trace b39f2c043c8d157b ]--- - Registered Address Lakeside, Bramley Road, Mount Farm, Milton Keynes, MK1 1PT, UK Registration No: 1397386 (Wales)
