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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
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