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SubjectRe: [BUG] WARNING: CPU: 3 PID: 1 at mm/debug_vm_pgtable.c:493
On Tue, 12 Oct 2021 11:34:19 -0700
Linus Torvalds <torvalds@linux-foundation.org> wrote:

> That warning seems to be due to pud_set_huge() failing (the "line 438"
> one I don't know what it is - there's no warning on that line in my
> tree, so I worry a bit that Steven has other things in his tree).

I saved off that warning from a different branch, and looking at the dmesg,
it is:

Linux version 5.14.0-rc2-test+

Which shows this happened on 5.14 as well (and explains why the line
numbers are different).

Here's the full splat:

------------[ cut here ]------------
WARNING: CPU: 2 PID: 1 at mm/debug_vm_pgtable.c:438 pud_huge_tests+0x2f/0x50
Modules linked in:
CPU: 2 PID: 1 Comm: swapper/0 Not tainted 5.14.0-rc2-test+ #16
Hardware name: MSI MS-7823/CSM-H87M-G43 (MS-7823), BIOS V1.6 02/22/2014
RIP: 0010:pud_huge_tests+0x2f/0x50
Code: 48 8b 05 c4 93 da ff 48 0f ba e0 3a 73 3c 55 48 c1 e6 0c 48 89 e5 53 48 89 fb 48 c7 07 00 00 00 00 e8 47 3d f5 fd 85 c0 75 02 <0f> 0b 48 89 df e8 0c 3e f5 fd 85 c0 75 02 0f 0b 48 8b 03 48 a9 9f
RSP: 0000:ffffb728c0033dd0 EFLAGS: 00010246
RAX: 0000000000000000 RBX: ffff8d5648f44570 RCX: 6421c8b694c43a00
RDX: 00ffffffaf11c9ec RSI: ffffb728c0033d58 RDI: ffffb728c0033d59
RBP: ffffb728c0033dd8 R08: 000000021f000000 R09: 0000000000040000
R10: 0000000000000001 R11: 0000000000000000 R12: ffff8d5648f44570
R13: ffff8d5640a808c0 R14: 000000000020713a R15: ffff8d5640a80938
FS: 0000000000000000(0000) GS:ffff8d5756800000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 0000000206c2a001 CR4: 00000000001706e0
Call Trace:
debug_vm_pgtable+0x533/0x6f0
? pgd_clear_tests.isra.0+0x50/0x50
do_one_initcall+0xe8/0x25c
? lock_is_held+0xc/0xe
? rcu_read_lock_sched_held+0x3b/0x72
do_initcalls+0xcd/0xed
kernel_init_freeable+0x18a/0x1c1
? rest_init+0x155/0x155
kernel_init+0x1a/0x11a
ret_from_fork+0x22/0x30
irq event stamp: 28613811
hardirqs last enabled at (28613821): [<ffffffffaf12caf1>] console_unlock+0x323/0x36e
hardirqs last disabled at (28613830): [<ffffffffaf12ca36>] console_unlock+0x268/0x36e
softirqs last enabled at (28613546): [<ffffffffb0200328>] __do_softirq+0x328/0x363
softirqs last disabled at (28613475): [<ffffffffaf0cfea2>] __irq_exit_rcu+0x5f/0x9b
---[ end trace 216b0cab27d4c431 ]---
------------[ cut here ]------------
WARNING: CPU: 2 PID: 1 at mm/debug_vm_pgtable.c:439 pud_huge_tests+0x3d/0x50
Modules linked in:
CPU: 2 PID: 1 Comm: swapper/0 Tainted: G W 5.14.0-rc2-test+ #16
Hardware name: MSI MS-7823/CSM-H87M-G43 (MS-7823), BIOS V1.6 02/22/2014
RIP: 0010:pud_huge_tests+0x3d/0x50
Code: 55 48 c1 e6 0c 48 89 e5 53 48 89 fb 48 c7 07 00 00 00 00 e8 47 3d f5 fd 85 c0 75 02 0f 0b 48 89 df e8 0c 3e f5 fd 85 c0 75 02 <0f> 0b 48 8b 03 48 a9 9f ff ff ff 74 02 0f 0b 5b 5d c3 c3 0f 1f 44
RSP: 0000:ffffb728c0033dd0 EFLAGS: 00010246
RAX: 0000000000000000 RBX: ffff8d5648f44570 RCX: 6421c8b694c43a00
RDX: 0000000000000000 RSI: ffffb728c0033d58 RDI: ffff8d5648f44570
RBP: ffffb728c0033dd8 R08: 000000021f000000 R09: 0000000000040000
R10: 0000000000000001 R11: 0000000000000000 R12: ffff8d5648f44570
R13: ffff8d5640a808c0 R14: 000000000020713a R15: ffff8d5640a80938
FS: 0000000000000000(0000) GS:ffff8d5756800000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 0000000206c2a001 CR4: 00000000001706e0
Call Trace:
debug_vm_pgtable+0x533/0x6f0
? pgd_clear_tests.isra.0+0x50/0x50
do_one_initcall+0xe8/0x25c
? lock_is_held+0xc/0xe
? rcu_read_lock_sched_held+0x3b/0x72
do_initcalls+0xcd/0xed
kernel_init_freeable+0x18a/0x1c1
? rest_init+0x155/0x155
kernel_init+0x1a/0x11a
ret_from_fork+0x22/0x30
irq event stamp: 28614155
hardirqs last enabled at (28614165): [<ffffffffaf12caf1>] console_unlock+0x323/0x36e
hardirqs last disabled at (28614174): [<ffffffffaf12ca36>] console_unlock+0x268/0x36e
softirqs last enabled at (28613546): [<ffffffffb0200328>] __do_softirq+0x328/0x363
softirqs last disabled at (28613475): [<ffffffffaf0cfea2>] __irq_exit_rcu+0x5f/0x9b
---[ end trace 216b0cab27d4c432 ]---


May be just the same bug at a different line number for 5.14-rc2?

-- Steve

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