linux-kernel - [BUG] WARNING: CPU: 3 PID: 1 at mm/debug_vm

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Date:   Tue, 12 Oct 2021 14:11:31 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     LKML <linux-kernel@...r.kernel.org>
Cc:     Linus Torvalds <torvalds@...ux-foundation.org>,
        Gavin Shan <gshan@...hat.com>,
        Anshuman Khandual <anshuman.khandual@....com>,
        Christophe Leroy <christophe.leroy@...roup.eu>,
        Gerald Schaefer <gerald.schaefer@...ux.ibm.com>,
        Andrew Morton <akpm@...ux-foundation.org>
Subject: [BUG] WARNING: CPU: 3 PID: 1 at mm/debug_vm_pgtable.c:493

My tests have been triggering on this every so often. My code is based on
v5.15-rc3. Note, this is not fully reproducible.

I also get errors an mm/debug_vm_pgtable.c:438

And it also triggers the WARN_ON()s after that as well.

Always happens at the debug_vm_pgtable() during boot up.

Here's the last splat:

------------[ cut here ]------------
 WARNING: CPU: 3 PID: 1 at mm/debug_vm_pgtable.c:492 debug_vm_pgtable+0x1312/0x1693
 Modules linked in:
 CPU: 3 PID: 1 Comm: swapper/0 Not tainted 5.15.0-rc3-test+ #24
 Hardware name: MSI MS-7823/CSM-H87M-G43 (MS-7823), BIOS V1.6 02/22/2014
 RIP: 0010:debug_vm_pgtable+0x1312/0x1693
 Code: 38 ff ff ff 48 c7 00 00 00 00 00 48 8b 75 b8 48 8b 95 78 ff ff ff 48 8b bd 38 ff ff ff 48 c1 e6 0c e8 62 4e 62 fe 85 c0 75 02 <0f> 0b 48 8b bd 38 ff ff ff e8 e0 50 62 fe 85 c0 75 02 0f 0b 48 8b
 RSP: 0000:ffffa1eac0033da8 EFLAGS: 00010246
 RAX: 0000000000000000 RBX: bffffffffffffff7 RCX: 0000000000000000
 RDX: ffffffffffe00000 RSI: ffffffff8bb477d0 RDI: 0000000000000007
 RBP: ffffa1eac0033e98 R08: ffffa1eac0033d23 R09: 000000021ee00000
 R10: 000000021effffff R11: 0000000000000000 R12: ffff8cf1436da538
 R13: 00003e8b00000000 R14: 000fffffffe00000 R15: 0000000000000027
 FS:  0000000000000000(0000) GS:ffff8cf256800000(0000) knlGS:0000000000000000
 CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
 CR2: 0000000000000000 CR3: 000000020f612001 CR4: 00000000001706e0
 Call Trace:
  ? destroy_args+0x281/0x281
  do_one_initcall+0x68/0x2d0
  ? rcu_read_lock_sched_held+0x46/0x80
  kernel_init_freeable+0x1a5/0x1f4
  ? rest_init+0x280/0x280
  kernel_init+0x1a/0x120
  ret_from_fork+0x22/0x30
 irq event stamp: 880991
 hardirqs last  enabled at (881001): [<ffffffff8a1096ef>] __up_console_sem+0x6f/0x80
 hardirqs last disabled at (881016): [<ffffffff8a1096d4>] __up_console_sem+0x54/0x80
 softirqs last  enabled at (881014): [<ffffffff8a097033>] irq_exit_rcu+0xa3/0xd0
 softirqs last disabled at (881009): [<ffffffff8a097033>] irq_exit_rcu+0xa3/0xd0
 ---[ end trace 731534acace262b5 ]---
 ------------[ cut here ]------------
 WARNING: CPU: 3 PID: 1 at mm/debug_vm_pgtable.c:493 debug_vm_pgtable+0x1324/0x1693
 Modules linked in:
 CPU: 3 PID: 1 Comm: swapper/0 Tainted: G        W         5.15.0-rc3-test+ #24
 Hardware name: MSI MS-7823/CSM-H87M-G43 (MS-7823), BIOS V1.6 02/22/2014
 RIP: 0010:debug_vm_pgtable+0x1324/0x1693
 Code: 78 ff ff ff 48 8b bd 38 ff ff ff 48 c1 e6 0c e8 62 4e 62 fe 85 c0 75 02 0f 0b 48 8b bd 38 ff ff ff e8 e0 50 62 fe 85 c0 75 02 <0f> 0b 48 8b 85 38 ff ff ff 48 8b 00 48 a9 9f ff ff ff 74 02 0f 0b
 RSP: 0000:ffffa1eac0033da8 EFLAGS: 00010246
 RAX: 0000000000000000 RBX: bffffffffffffff7 RCX: 0000000000000000
 RDX: ffffffffffe00000 RSI: ffffffff8bb477d0 RDI: ffff8cf1436db160
 RBP: ffffa1eac0033e98 R08: 0000000000000000 R09: 000000021ee00000
 R10: 000000021effffff R11: 0000000000000000 R12: ffff8cf1436da538
 R13: 00003e8b00000000 R14: 000fffffffe00000 R15: 0000000000000027
 FS:  0000000000000000(0000) GS:ffff8cf256800000(0000) knlGS:0000000000000000
 CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
 CR2: 0000000000000000 CR3: 000000020f612001 CR4: 00000000001706e0
 Call Trace:
  ? destroy_args+0x281/0x281
  do_one_initcall+0x68/0x2d0
  ? rcu_read_lock_sched_held+0x46/0x80
  kernel_init_freeable+0x1a5/0x1f4
  ? rest_init+0x280/0x280
  kernel_init+0x1a/0x120
  ret_from_fork+0x22/0x30
 irq event stamp: 881327
 hardirqs last  enabled at (881337): [<ffffffff8a1096ef>] __up_console_sem+0x6f/0x80
 hardirqs last disabled at (881352): [<ffffffff8a1096d4>] __up_console_sem+0x54/0x80
 softirqs last  enabled at (881350): [<ffffffff8a097033>] irq_exit_rcu+0xa3/0xd0
 softirqs last disabled at (881345): [<ffffffff8a097033>] irq_exit_rcu+0xa3/0xd0
 ---[ end trace 731534acace262b6 ]---

Config attached (this is x86_64).

-- Steve

Download attachment "config.gz" of type "application/gzip" (30048 bytes)