linux-kernel - Re: [PATCH 6.1 000/217] 6.1.95-rc1 review [parisc64/C3700 boot failures]

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Date: Sat, 22 Jun 2024 07:58:31 -0700
From: Guenter Roeck <linux@...ck-us.net>
To: Greg Kroah-Hartman <gregkh@...uxfoundation.org>, stable@...r.kernel.org
Cc: patches@...ts.linux.dev, linux-kernel@...r.kernel.org,
 torvalds@...ux-foundation.org, akpm@...ux-foundation.org, shuah@...nel.org,
 patches@...nelci.org, lkft-triage@...ts.linaro.org, pavel@...x.de,
 jonathanh@...dia.com, f.fainelli@...il.com, sudipm.mukherjee@...il.com,
 srw@...dewatkins.net, rwarsow@....de, conor@...nel.org,
 allen.lkml@...il.com, broonie@...nel.org, Oleg Nesterov <oleg@...hat.com>,
 linux-parisc@...r.kernel.org, Helge Deller <deller@....de>,
 "James E.J. Bottomley" <James.Bottomley@...senPartnership.com>
Subject: Re: [PATCH 6.1 000/217] 6.1.95-rc1 review [parisc64/C3700 boot
 failures]

[ Copying parisc maintainers - maybe they can test on real hardware ]

On 6/19/24 05:54, Greg Kroah-Hartman wrote:
> This is the start of the stable review cycle for the 6.1.95 release.
> There are 217 patches in this series, all will be posted as a response
> to this one.  If anyone has any issues with these being applied, please
> let me know.
> 
> Responses should be made by Fri, 21 Jun 2024 12:55:11 +0000.
> Anything received after that time might be too late.
> 
...
> Oleg Nesterov <oleg@...hat.com>
>      zap_pid_ns_processes: clear TIF_NOTIFY_SIGNAL along with TIF_SIGPENDING
> 

I can not explain it, but this patch causes all my parisc64 (C3700)
boot tests to crash. There are lots of memory corruption BUGs such as

[    0.000000] =============================================================================
[    0.000000] BUG kmalloc-96 (Not tainted): Padding overwritten. 0x0000000043411dd0-0x0000000043411f5f @offset=3536

ultimately followed by

[    0.462562] Unaligned handler failed, ret = -14
...
[    0.469160]  IAOQ[0]: idr_alloc_cyclic+0x48/0x118
[    0.469372]  IAOQ[1]: idr_alloc_cyclic+0x54/0x118
[    0.469548]  RP(r2): __kernfs_new_node.constprop.0+0x160/0x420
[    0.469782] Backtrace:
[    0.469928]  [<00000000404af108>] __kernfs_new_node.constprop.0+0x160/0x420
[    0.470285]  [<00000000404b0cac>] kernfs_new_node+0xbc/0x118
[    0.470523]  [<00000000404b158c>] kernfs_create_empty_dir+0x54/0xf0
[    0.470756]  [<00000000404b665c>] sysfs_create_mount_point+0x4c/0xb0
[    0.470996]  [<00000000401181cc>] cgroup_init+0x5b4/0x738
[    0.471213]  [<0000000040102220>] start_kernel+0x1238/0x1308
[    0.471429]  [<0000000040107c90>] start_parisc+0x188/0x1d0
...
[    0.474956] Kernel panic - not syncing: Attempted to kill the idle task!
SeaBIOS wants SYSTEM RESET.

This is with qemu v9.0.1.

Reverting this patch fixes the problem (I tried several times to be sure
since I don't see the connection). I don't see the problem in any other
branch. Bisect log is attached for reference.

Guenter

---
# bad: [a6398e37309000e35cedb5cc328a0f8d00d7d7b9] Linux 6.1.95
# good: [eb44d83053d66372327e69145e8d2fa7400a4991] Linux 6.1.94
git bisect start 'HEAD' 'v6.1.94'
# good: [f17443d52d805c9a7fab5e67a4e8b973626fe1cd] cachefiles: resend an open request if the read request's object is closed
git bisect good f17443d52d805c9a7fab5e67a4e8b973626fe1cd
# good: [cc09e1d3519feab823685f4297853d468f44549d] iio: imu: inv_icm42600: delete unneeded update watermark call
git bisect good cc09e1d3519feab823685f4297853d468f44549d
# good: [b7b6bc60edb2132a569899bcd9ca099a0556c6ee] intel_th: pci: Add Granite Rapids SOC support
git bisect good b7b6bc60edb2132a569899bcd9ca099a0556c6ee
# good: [35e395373ecd14b64da7d54f565927a9368dcf20] mptcp: pm: update add_addr counters after connect
git bisect good 35e395373ecd14b64da7d54f565927a9368dcf20
# good: [29d35f0b53d4bd82ebc37c500a8dd73da61318ff] serial: 8250_dw: fall back to poll if there's no interrupt
git bisect good 29d35f0b53d4bd82ebc37c500a8dd73da61318ff
# good: [ea25a4c0de5700928c7fd0aa789eee39a457ba95] misc: microchip: pci1xxxx: Fix a memory leak in the error handling of gp_aux_bus_probe()
git bisect good ea25a4c0de5700928c7fd0aa789eee39a457ba95
# good: [e44999ec0b49dca9a9a2090c5432d893ea4f8d20] i2c: designware: Fix the functionality flags of the slave-only interface
git bisect good e44999ec0b49dca9a9a2090c5432d893ea4f8d20
# bad: [edd2754a62bee8d97b4808a15de024f66a1ddccf] zap_pid_ns_processes: clear TIF_NOTIFY_SIGNAL along with TIF_SIGPENDING
git bisect bad edd2754a62bee8d97b4808a15de024f66a1ddccf
# first bad commit: [edd2754a62bee8d97b4808a15de024f66a1ddccf] zap_pid_ns_processes: clear TIF_NOTIFY_SIGNAL along with TIF_SIGPENDING