Compared to 6.6.75, 6.6.76-rc1 freezes up for roughly one minute during boot, and I think the log messages are indicating a crypto self-test failure afterward. I have tried it on two different computers (a Core 2 Duo-based PC and a Haswell-based 2015 15" MacBook Pro) and it happens 100% of the time on both. I bisected it down to crypto-api-fix-boot-up-self-test-race ("crypto: api - Fix boot-up self-test race"). Reverting that one patch from 6.6.76-rc1 fixes the regression for me.

By the way, I also tested 6.13.2-rc1 and 6.12.13-rc1, and this bug did not reproduce on either.

Log excerpt:

[ 4.523861] ima: No TPM chip found, activating TPM-bypass! [ 4.534858] ima: Allocated hash algorithm: sha256 [ 4.544294] ima: No architecture policies found [ 4.553384] evm: Initialising EVM extended attributes: [ 4.563682] evm: security.selinux [ 4.570339] evm: security.SMACK64 (disabled) [ 4.578900] evm: security.SMACK64EXEC (disabled) [ 4.588156] evm: security.SMACK64TRANSMUTE (disabled) [ 4.598279] evm: security.SMACK64MMAP (disabled) [ 4.607534] evm: security.apparmor [ 4.614363] evm: security.ima [ 4.620326] evm: security.capability [ 4.627502] evm: HMAC attrs: 0x1 [ 65.685967] random: crng init done [ 68.452968] DRBG: could not allocate digest TFM handle: hmac(sha512) [ 68.465701] alg: drbg: Failed to reset rng [ 68.473914] alg: drbg: Test 0 failed for drbg_nopr_hmac_sha512 [ 68.485595] alg: self-tests for stdrng using drbg_nopr_hmac_sha512 failed (rc=-22) [ 68.485597] ------------[ cut here ]------------ [ 68.510017] alg: self-tests for stdrng using drbg_nopr_hmac_sha512 failed (rc=-22) [ 68.510035] WARNING: CPU: 1 PID: 78 at crypto/testmgr.c:5936 alg_test+0x49e/0x610 [ 68.540198] Modules linked in: [ 68.546332] CPU: 1 PID: 78 Comm: cryptomgr_test Not tainted 6.6.76-rc1 #1 [ 68.559920] Hardware name: Gigabyte Technology Co., Ltd. G41MT-S2PT/G41MT-S2PT, BIOS F2 12/06/2011 [ 68.579005] RIP: 0010:alg_test+0x49e/0x610 [ 68.587220] Code: de 48 89 df 89 04 24 e8 70 ed fe ff 44 8b 0c 24 e9 bc fc ff ff 44 89 c9 48 89 ea 4c 89 ee 48 c7 c7 80 9a ed ad e8 f2 74 b2 ff <0f> 0b 44 8b 0c 24 e9 a1 fe ff ff 8b 05 21 04 c2 01 85 c0 74 56 83 [ 68.624782] RSP: 0018:ffffbc8380307e10 EFLAGS: 00010286 [ 68.635252] RAX: 0000000000000000 RBX: 00000000ffffffff RCX: c0000000ffffefff [ 68.649534] RDX: 0000000000000000 RSI: 00000000ffffefff RDI: 0000000000000001 [ 68.663816] RBP: ffffa01c47be0200 R08: 0000000000000000 R09: ffffbc8380307c98 [ 68.678100] R10: 0000000000000003 R11: ffffffffae0d1368 R12: 0000000000000058 [ 68.692384] R13: ffffa01c47be0280 R14: 0000000000000058 R15: 0000000000000058 [ 68.706665] FS: 0000000000000000(0000) GS:ffffa01d37c80000(0000) knlGS:0000000000000000 [ 68.722871] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 68.734381] CR2: 00007ff2f64622e0 CR3: 0000000146c20000 CR4: 00000000000406e0 [ 68.748664] Call Trace: [ 68.753588] <TASK> [ 68.757817] ? alg_test+0x49e/0x610 [ 68.764817] ? __warn+0x81/0x130 [ 68.771301] ? alg_test+0x49e/0x610 [ 68.778304] ? report_bug+0x171/0x1a0 [ 68.785652] ? console_unlock+0x78/0x120 [ 68.793521] ? handle_bug+0x58/0x90 [ 68.800525] ? exc_invalid_op+0x17/0x70 [ 68.808221] ? asm_exc_invalid_op+0x1a/0x20 [ 68.816611] ? alg_test+0x49e/0x610 [ 68.823614] ? finish_task_switch.isra.0+0x90/0x2d0 [ 68.833390] ? __schedule+0x3c8/0xb00 [ 68.840739] ? __pfx_cryptomgr_test+0x10/0x10 [ 68.849473] cryptomgr_test+0x24/0x40 [ 68.856824] kthread+0xe5/0x120 [ 68.863133] ? __pfx_kthread+0x10/0x10 [ 68.870656] ret_from_fork+0x31/0x50 [ 68.877832] ? __pfx_kthread+0x10/0x10 [ 68.885354] ret_from_fork_asm+0x1b/0x30 [ 68.893226] </TASK> [ 68.897626] ---[ end trace 0000000000000000 ]---