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Message-ID: <76c45021481cfe1aaa9fe2cfcd2287ac6c8d4504.camel@physik.fu-berlin.de>
Date: Mon, 04 Aug 2025 07:36:52 +0200
From: John Paul Adrian Glaubitz <glaubitz@...sik.fu-berlin.de>
To: Anthony Yznaga <anthony.yznaga@...cle.com>, "Matthew Wilcox (Oracle)"
	 <willy@...radead.org>, linux-arch@...r.kernel.org
Cc: linux-mm@...ck.org, linux-kernel@...r.kernel.org, "David S. Miller"	
 <davem@...emloft.net>, sparclinux@...r.kernel.org, Andreas Larsson	
 <andreas@...sler.com>, Rod Schnell <rods@...radio.com>, Sam James
 <sam@...too.org>
Subject: Re: [PATCH v4 25/36] sparc64: Implement the new page table range API

Hi Anthony,

On Mon, 2025-08-04 at 07:12 +0200, John Paul Adrian Glaubitz wrote:
> On Sun, 2025-08-03 at 12:08 -0700, Anthony Yznaga wrote:
> > There was a follow-on fix that addressed a bug with this patch:
> > 
> > f4b4f3ec1a31 sparc64: add missing initialization of folio in tlb_batch_add()
> 
> Indeed I just tried v6.6 which has this patch and added your sun4u fix and it
> seems to be stable. I was sure I saw problems even with v6.16 though.
> 
> Let me run more tests.

I'm seeing another crash on v6.16 on sun4u even with your patch applied:

[  456.443492] kernel BUG at fs/ext4/inode.c:1174!
[  456.503059]               \|/ ____ \|/
[  456.503059]               "@'/ .. \`@"
[  456.503059]               /_| \__/ |_\
[  456.503059]                  \__U_/
[  456.696513] apt-get(1217): Kernel bad sw trap 5 [#1]
[  456.761698] CPU: 0 UID: 0 PID: 1217 Comm: apt-get Not tainted 6.16.0+ #24 VOLUNTARY 
[  456.863502] TSTATE: 0000000011001601 TPC: 0000000010309250 TNPC: 0000000010309254 Y: 00000000    Not tainted
[  456.992850] TPC: <ext4_block_write_begin+0x450/0x540 [ext4]>
[  457.067500] g0: 0000000000000000 g1: 0000000000000001 g2: 0000000000000000 g3: 0000000000000000
[  457.181869] g4: fff00000141d5c80 g5: 0000000000000008 g6: fff000000be24000 g7: 0000000000000001
[  457.296245] o0: 00000000103944b0 o1: 0000000000000496 o2: ffffffffffffffbf o3: 0000000000101cca
[  457.410618] o4: 0000000000000000 o5: 0000000000000000 sp: fff000000be26fd1 ret_pc: 0000000010309248
[  457.529571] RPC: <ext4_block_write_begin+0x448/0x540 [ext4]>
[  457.604020] l0: fff000003def26e0 l1: 0000000000113cca l2: fff000003def2578 l3: 0000000000000002
[  457.718394] l4: 0000000000000000 l5: 0000000000080000 l6: 0000000000012000 l7: 0000000000000001
[  457.832770] i0: 0000000000000000 i1: 000c00000026b500 i2: 0000000000001000 i3: 0000000000082000
[  457.947146] i4: 00000000103034a0 i5: 0000000000000000 i6: fff000000be270c1 i7: 000000001030c8dc
[  458.061528] I7: <ext4_da_write_begin+0x1bc/0x340 [ext4]>
[  458.131389] Call Trace:
[  458.163408] [<000000001030c8dc>] ext4_da_write_begin+0x1bc/0x340 [ext4]
[  458.250447] [<0000000000674230>] generic_perform_write+0x90/0x240
[  458.330606] [<00000000102f50b4>] ext4_buffered_write_iter+0x54/0x120 [ext4]
[  458.422214] [<00000000102f5624>] ext4_file_write_iter+0x3e4/0x780 [ext4]
[  458.510388] [<0000000000749cc4>] vfs_write+0x2c4/0x3e0
[  458.577867] [<0000000000749f4c>] ksys_write+0x4c/0xe0
[  458.644203] [<0000000000749ff4>] sys_write+0x14/0x40
[  458.709397] [<0000000000406174>] linux_sparc_syscall+0x34/0x44
[  458.786048] Disabling lock debugging due to kernel taint
[  458.855904] Caller[000000001030c8dc]: ext4_da_write_begin+0x1bc/0x340 [ext4]
[  458.948653] Caller[0000000000674230]: generic_perform_write+0x90/0x240
[  459.034430] Caller[00000000102f50b4]: ext4_buffered_write_iter+0x54/0x120 [ext4]
[  459.131761] Caller[00000000102f5624]: ext4_file_write_iter+0x3e4/0x780 [ext4]
[  459.225648] Caller[0000000000749cc4]: vfs_write+0x2c4/0x3e0
[  459.298846] Caller[0000000000749f4c]: ksys_write+0x4c/0xe0
[  459.370900] Caller[0000000000749ff4]: sys_write+0x14/0x40
[  459.441810] Caller[0000000000406174]: linux_sparc_syscall+0x34/0x44
[  459.524168] Caller[0000000000000000]: 0x0
[  459.576772] Instruction DUMP:
[  459.576776]  11040e51 
[  459.615662]  7c04b816 
[  459.646541]  901220b0 
[  459.677418] <91d02005>
[  459.708302]  9735a000 
[  459.739181]  95352000 
[  459.770076]  d25fa7cf 
[  459.800945]  7fffe818 
[  459.831825]  90100019 
[  459.862706] 
[  459.941500] systemd[1]: Failed to open /dev/pts device, ignoring: Inappropriate ioctl for device
[  460.063831] systemd[1]: rsyslog.service: Main process exited, code=killed, status=6/ABRT
[  460.170962] systemd[1]: rsyslog.service: Failed with result 'signal'.
[  460.267153] systemd[1]: systemd-journald.service: Scheduled restart job, restart counter is at 1.
[  460.388605] systemd[1]: rsyslog.service: Scheduled restart job, restart counter is at 1.
[  460.517346] systemd[1]: Starting rsyslog.service - System Logging Service...
[  460.618299] systemd[1]: Starting systemd-journald.service - Journal Service...
[  460.895645] systemd-journald[1237]: Collecting audit messages is disabled.
[  461.048068] systemd[1]: Failed to open /dev/pts device, ignoring: Inappropriate ioctl for device
[  461.202783] systemd-journald[1237]: File /var/log/journal/9ac90e257b3e423284cfc21a00cbeeb8/system.journal corrupted or uncleanly shut down, renaming and replacing.
[  461.456867] systemd[1]: Started rsyslog.service - System Logging Service.
[  461.616651] systemd-journald[1237]: Time jumped backwards, rotating.
[  461.773305] systemd-journald[1237]: Failed to read journal file /var/log/journal/9ac90e257b3e423284cfc21a00cbeeb8/user-1002.journal for rotation, trying to move it out of the way: Device or
resource busy
[  462.065725] systemd[1]: Started systemd-journald.service - Journal Service.
[  462.159895] systemd-journald[1237]: Time jumped backwards, rotating.
[  519.719624] kernel BUG at fs/ext4/inode.c:1174!
[  519.779143]               \|/ ____ \|/
[  519.779143]               "@'/ .. \`@"
[  519.779143]               /_| \__/ |_\
[  519.779143]                  \__U_/
[  519.972586] apt(1249): Kernel bad sw trap 5 [#2]
[  520.033239] CPU: 0 UID: 0 PID: 1249 Comm: apt Tainted: G      D             6.16.0+ #24 VOLUNTARY 
[  520.151048] Tainted: [D]=DIE
[  520.188797] TSTATE: 0000000011001603 TPC: 0000000010309250 TNPC: 0000000010309254 Y: 00000000    Tainted: G      D            
[  520.338725] TPC: <ext4_block_write_begin+0x450/0x540 [ext4]>
[  520.413282] g0: 0000000000000000 g1: 0000000000000001 g2: 0000000000000000 g3: 0000000000000000
[  520.527655] g4: fff00000141d40c0 g5: 000000000000000b g6: fff000000a818000 g7: 0000000000000001
[  520.642031] o0: 00000000103944b0 o1: 0000000000000496 o2: fffffffffffffcc0 o3: 0000000000101cca
[  520.756408] o4: 0000000000000004 o5: 0000000000000000 sp: fff000000a81afd1 ret_pc: 0000000010309248
[  520.875350] RPC: <ext4_block_write_begin+0x448/0x540 [ext4]>
[  520.949799] l0: fff000023439af00 l1: 0000000000113cca l2: fff000023439ad98 l3: 0000000000000002
[  521.064174] l4: 0000000000000000 l5: 0000000000080000 l6: 0000000000012000 l7: 0000000000000001
[  521.178547] i0: 0000000000000000 i1: 000c000000164a00 i2: 0000000000001fc0 i3: 0000000000680000
[  521.292923] i4: 00000000103034a0 i5: 0000000000000000 i6: fff000000a81b0c1 i7: 000000001030c8dc
[  521.407297] I7: <ext4_da_write_begin+0x1bc/0x340 [ext4]>
[  521.477195] Call Trace:
[  521.509295] [<000000001030c8dc>] ext4_da_write_begin+0x1bc/0x340 [ext4]
[  521.596330] [<0000000000674230>] generic_perform_write+0x90/0x240
[  521.676495] [<00000000102f50b4>] ext4_buffered_write_iter+0x54/0x120 [ext4]
[  521.768196] [<00000000102f5624>] ext4_file_write_iter+0x3e4/0x780 [ext4]
[  521.856381] [<0000000000749cc4>] vfs_write+0x2c4/0x3e0
[  521.923957] [<0000000000749f4c>] ksys_write+0x4c/0xe0
[  521.990294] [<0000000000749ff4>] sys_write+0x14/0x40
[  522.055486] [<0000000000406174>] linux_sparc_syscall+0x34/0x44
[  522.132122] Caller[000000001030c8dc]: ext4_da_write_begin+0x1bc/0x340 [ext4]
[  522.224873] Caller[0000000000674230]: generic_perform_write+0x90/0x240
[  522.310649] Caller[00000000102f50b4]: ext4_buffered_write_iter+0x54/0x120 [ext4]
[  522.407974] Caller[00000000102f5624]: ext4_file_write_iter+0x3e4/0x780 [ext4]
[  522.501864] Caller[0000000000749cc4]: vfs_write+0x2c4/0x3e0
[  522.575062] Caller[0000000000749f4c]: ksys_write+0x4c/0xe0
[  522.647118] Caller[0000000000749ff4]: sys_write+0x14/0x40
[  522.718031] Caller[0000000000406174]: linux_sparc_syscall+0x34/0x44
[  522.800380] Caller[0000000000000000]: 0x0
[  522.852991] Instruction DUMP:
[  522.852994]  11040e51 
[  522.891878]  7c04b816 
[  522.922760]  901220b0 
[  522.953638] <91d02005>
[  522.984521]  9735a000 
[  523.015401]  95352000 
[  523.046284]  d25fa7cf 
[  523.077163]  7fffe818 
[  523.108109]  90100019 
[  523.139044]

I'll try to bisect this one later this week.

Adrian

-- 
 .''`.  John Paul Adrian Glaubitz
: :' :  Debian Developer
`. `'   Physicist
  `-    GPG: 62FF 8A75 84E0 2956 9546  0006 7426 3B37 F5B5 F913

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