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From: Laura Nao <laura.nao@collabora.com>
To: regressions@lists.linux.dev
Cc: linux-kernel@vger.kernel.org,
	kernel@collabora.com
Subject: [REGRESSION] next boot regression caused by RIP: 0010:usercopy_abort+0x74/0x76 kernel panic
Date: Fri,  7 Jun 2024 17:14:39 +0200
Message-Id: <20240607151439.175035-1-laura.nao@collabora.com>
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Hello,

KernelCI has detected a boot regression affecting all AMD and Intel
Chromebooks in the Collabora LAVA lab, occurring between next-20240605
and next-20240606.

The following kernel panic has been reported in the logs. The trace
provided below is from an Acer Chromebook 317, with similar traces
observed on other devices:

[    5.944268] RIP: 0010:usercopy_abort+0x74/0x76
[    5.944276] Code: 0f 89 9f 51 48 0f 45 d6 49 c7 c3 ac c1 7c 9f 4c 89 d1 57 48 c7 c6 38 54 7b 9f 48 c7 c7 b5 c1 7c 9f 49 0f 45 f3 e8 b9 8c e4 ff <0f> 0b 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 0f 1f 44 00
[    5.944278] RSP: 0000:ffffb01e8001fb90 EFLAGS: 00010246
[    5.944280] RAX: 0000000000000068 RBX: 0000000000000d80 RCX: 0000000000000000
[    5.944281] RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
[    5.944282] RBP: 0000000000000000 R08: 0000000000000003 R09: 2079726f6d656d20
[    5.944284] R10: 79706f6372657375 R11: 79706f6372657375 R12: ffff8e7b400a8800
[    5.944285] R13: 0000000000000d80 R14: 0000000000000000 R15: 00000000ff879a40
[    5.944286] FS:  0000000000000000(0003) GS:ffff8e7bc0100000(0063) knlGS:00000000eca4d440
[    5.944288] CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
[    5.944289] CR2: 00000000080e61d0 CR3: 0000000107002000 CR4: 0000000000350ef0
[    5.944290] Call Trace:
[    5.944293]  <TASK>
[    5.944295]  ? __die_body+0x1b/0x5d
[    5.944300]  ? die+0x31/0x4b
[    5.944303]  ? do_trap+0x7c/0xfe
[    5.944306]  ? usercopy_abort+0x74/0x76
[    5.944309]  ? usercopy_abort+0x74/0x76
[    5.944312]  ? do_error_trap+0x6f/0x99
[    5.944315]  ? usercopy_abort+0x74/0x76
[    5.944318]  ? exc_invalid_op+0x4e/0x65
[    5.944321]  ? usercopy_abort+0x74/0x76
[    5.944324]  ? asm_exc_invalid_op+0x16/0x20
[    5.944327]  ? usercopy_abort+0x74/0x76
[    5.944330]  __check_heap_object+0xcb/0x110
[    5.944334]  __check_object_size+0x181/0x26d
[    5.944336]  copy_from_buffer+0x43/0x66
[    5.944340]  copy_uabi_to_xstate+0x113/0x194
[    5.944343]  __fpu_restore_sig+0x3a3/0x4be
[    5.944347]  fpu__restore_sig+0x6c/0x83
[    5.944350]  ia32_restore_sigcontext+0x14e/0x16d
[    5.944354]  __do_compat_sys_sigreturn+0x7b/0xbc
[    5.944357]  do_int80_emulation+0xad/0xd3
[    5.944360]  ? handle_mm_fault+0x10e/0x199
[    5.944363]  ? exc_page_fault+0x27b/0x42f
[    5.944365]  ? fpregs_assert_state_consistent+0x22/0x47
[    5.944368]  ? clear_bhb_loop+0x45/0xa0
[    5.944370]  ? clear_bhb_loop+0x45/0xa0
[    5.944372]  ? clear_bhb_loop+0x45/0xa0
[    5.944374]  ? clear_bhb_loop+0x45/0xa0
[    5.944375]  ? clear_bhb_loop+0x45/0xa0
[    5.944377]  ? clear_bhb_loop+0xe/0xa0
[    5.944379]  asm_int80_emulation+0x16/0x20
[    5.944382] RIP: 0023:0xeca52579
[    5.944384] Code: b8 01 10 06 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 00 00 00 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 8d b4 26 00 00 00 00 8d b4 26 00 00 00 00
[    5.944386] RSP: 002b:00000000ff879cbc EFLAGS: 00000246
[    5.944387] RAX: 0000000000000060 RBX: 00000000ffffffff RCX: 00000000ff879d08
[    5.944389] RDX: 0000000000000000 RSI: 0000000009b111a0 RDI: 00000000ff879d08
[    5.944390] RBP: 00000000080d1801 R08: 0000000000000000 R09: 0000000000000000
[    5.944391] R10: 0000000000000000 R11: 0000000000000282 R12: 0000000000000000
[    5.944392] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
[    5.944393]  </TASK>
[    5.944394] Modules linked in:
[    5.944433] ---[ end trace 0000000000000000 ]---
[    6.287986] RIP: 0010:usercopy_abort+0x74/0x76
[    6.293033] Code: 0f 89 9f 51 48 0f 45 d6 49 c7 c3 ac c1 7c 9f 4c 89 d1 57 48 c7 c6 38 54 7b 9f 48 c7 c7 b5 c1 7c 9f 49 0f 45 f3 e8 b9 8c e4 ff <0f> 0b 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 0f 1f 44 00
[    6.313975] RSP: 0000:ffffb01e8001fb90 EFLAGS: 00010246
[    6.319810] RAX: 0000000000000068 RBX: 0000000000000d80 RCX: 0000000000000000
[    6.327780] RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
[    6.335744] RBP: 0000000000000000 R08: 0000000000000003 R09: 2079726f6d656d20
[    6.343710] R10: 79706f6372657375 R11: 79706f6372657375 R12: ffff8e7b400a8800
[    6.351678] R13: 0000000000000d80 R14: 0000000000000000 R15: 00000000ff879a40
[    6.359646] FS:  0000000000000000(0003) GS:ffff8e7bc0000000(0063) knlGS:00000000eca4d440
[    6.368680] CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
[    6.375098] CR2: 00000000f322e480 CR3: 0000000107002000 CR4: 0000000000350ef0
[    6.383065] Kernel panic - not syncing: Fatal exception
[    6.388907] Kernel Offset: 0x1ba00000 from 0xffffffff81000000 (relocation range: 0xffffffff80000000-0xffffffffbfffffff)

The full kernel log is available on [1]. The config used was the
upstream x86_64 defconfig with a fragment applied on top [2].

The issue is still present on next-20240607.

I'm sending this report to track the regression while a fix is 
identified. I'll investigate the issue/run a bisection and report back 
with the results.

Best,

Laura

[1] https://pastebin.com/raw/1yDEDXSF
[2] https://pastebin.com/raw/vPSw6cfB

#regzbot introduced: next-20240605..next-20240606