[PATCH v6 00/18] Use block pr_ops in LIO

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[sorry for the adding you in CC]

While running LTP controllers test suite on this patch set applied on top of
the next-20230406 and the following kernel panic noticed on qemu-i386.

crash log:
---------
pids 1 TINFO: timeout per run is 0h 25m 0s
pids 1 TINFO: test starts with cgroup version 1
pids 1 TINFO: Running testcase 6 with 10 processes
pids 1 TINFO: set a limit that is smaller than current number of pids
<6>[  782.211806] cgroup: fork rejected by pids controller in /ltp/test-2724
pids 1 TPASS: fork failed as expected
/opt/ltp/testcases/bin/tst_test.sh: line 150:  2760 Killed                  pids_task2
/opt/ltp/testcases/bin/tst_test.sh: line 150:  2761 Killed                  pids_task2
/opt/ltp/testcases/bin/tst_test.sh: line 150:  2762 Killed                  pids_task2
/opt/ltp/testcases/bin/tst_test.sh: line 150:  2763 Killed                  pids_task2
/opt/ltp/testcases/bin/tst_test.sh: line 150:  2764 Killed                  pids_task2
/opt/ltp/testcases/bin/tst_test.sh: line 150:  2765 Killed                  pids_task2
/opt/ltp/testcases/bin/tst_test.sh: line 150:  2766 Killed                  pids_task2
/opt/ltp/testcases/bin/tst_test.sh: line 150:  2767 Killed                  pids_task2
/opt/ltp/testcases/bin/tst_test.sh: line 150:  2768 Killed                  pids_task2
/opt/ltp/testcases/bin/tst_test.sh: line 150:  2769 Killed                  pids_task2
<4>[  782.594441] int3: 0000 [#1] PREEMPT SMP
<4>[  782.594783] CPU: 1 PID: 2724 Comm: pids.sh Not tainted 6.3.0-rc5-next-20230406 #1
<4>[  782.594915] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.14.0-2 04/01/2014
<4>[  782.595168] EIP: get_page_from_freelist+0x157/0xccc
<4>[  782.595745] Code: 48 04 8d 43 08 85 c9 0f 85 fe 07 00 00 3b 73 0c 0f 82 f5 07 00 00 89 45 c8 8b 45 c8 8b 00 89 45 e0 85 c0 0f 84 fc 07 00 00 3e <8d> 74 26 00 8b 45 cc 80 78 14 00 0f 84 90 05 00 00 8b 45 e0 8b 58
<4>[  782.595850] EAX: 00000000 EBX: c7ab5ce4 ECX: 00000800 EDX: 00000000
<4>[  782.595889] ESI: 00400dc0 EDI: 00000000 EBP: c7ab5c78 ESP: c7ab5c04
<4>[  782.595928] DS: 007b ES: 007b FS: 00d8 GS: 0033 SS: 0068 EFLAGS: 00000297
<4>[  782.596017] CR0: 80050033 CR2: 086d1d54 CR3: 06eaa000 CR4: 000006d0
<4>[  782.596188] Call Trace:
<4>[  782.596503]  ? exc_int3+0x10/0x130
<4>[  782.596630]  ? __irq_exit_rcu+0x15/0xcc
<4>[  782.596655]  ? sysvec_call_function+0x3c/0x3c
<4>[  782.596677]  ? __irq_exit_rcu+0x15/0xcc
<4>[  782.596694]  ? irqentry_exit+0x26/0x58
<4>[  782.596733]  __alloc_pages+0x156/0xf50
<4>[  782.596783]  ? handle_exception+0x133/0x133
<4>[  782.596817]  ? __rcu_read_unlock+0x1e/0x30
<4>[  782.596843]  ? sysvec_call_function+0x3c/0x3c
<4>[  782.596880]  ? __irq_exit_rcu+0x15/0xcc
<4>[  782.596903]  pte_alloc_one+0x23/0x88
<4>[  782.596928]  __pte_alloc+0x21/0xb0
<4>[  782.596981]  ? trace_hardirqs_on+0x2c/0x88
<4>[  782.597002]  copy_page_range+0x67d/0xb40
<4>[  782.597049]  ? mas_wr_modify+0x10e/0x364
<4>[  782.597069]  ? mod_objcg_state+0x99/0x378
<4>[  782.597103]  ? mas_wr_store_entry.isra.0+0x10c/0x534
<4>[  782.597127]  ? mas_store+0x45/0xb0
<4>[  782.597160]  copy_process+0x1de6/0x1f9c
<4>[  782.597179]  ? lockref_get_not_dead+0x2c/0x38
<4>[  782.597246]  kernel_clone+0xc1/0x3dc
<4>[  782.597279]  __ia32_sys_clone+0x71/0x8c
<4>[  782.597320]  __do_fast_syscall_32+0x4c/0xb8
<4>[  782.597340]  do_fast_syscall_32+0x32/0x74
<4>[  782.597361]  do_SYSENTER_32+0x15/0x24
<4>[  782.597381]  entry_SYSENTER_32+0x98/0xf1
<4>[  782.597484] EIP: 0xb7f3e579
<4>[  782.597838] Code: b8 01 10 06 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 00 00 00 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 8d 76 00 58 b8 77 00 00 00 cd 80 90 8d 76
<4>[  782.597856] EAX: ffffffda EBX: 01200011 ECX: 00000000 EDX: 00000000
<4>[  782.597876] ESI: 00000000 EDI: b7f398e8 EBP: b7f01e3c ESP: bfa4599c
<4>[  782.597889] DS: 007b ES: 007b FS: 0000 GS: 0033 SS: 007b EFLAGS: 00000286
<4>[  782.598167] Modules linked in:
<4>[  782.616852]  ---[ end trace 0000000000000000 ] ---
<4>[  782.616998] EIP: get_page_from_freelist+0x157/0xccc
<4>[  782.617213] Code: 48 04 8d 43 08 85 c9 0f 85 fe 07 00 00 3b 73 0c 0f 82 f5 07 00 00 89 45 c8 8b 45 c8 8b 00 89 45 e0 85 c0 0f 84 fc 07 00 00 3e <8d> 74 26 00 8b 45 cc 80 78 14 00 0f 84 90 05 00 00 8b 45 e0 8b 58
<4>[  782.617234] EAX: 00000000 EBX: c7ab5ce4 ECX: 00000800 EDX: 00000000
<4>[  782.617247] ESI: 00400dc0 EDI: 00000000 EBP: c7ab5c78 ESP: c7ab5c04
<4>[  782.617260] DS: 007b ES: 007b FS: 00d8 GS: 0033 SS: 0068 EFLAGS: 00000297
<4>[  782.617276] CR0: 80050033 CR2: 086d1d54 CR3: 06eaa000 CR4: 000006d0
<0>[  782.617472] Kernel panic - not syncing: Fatal exception in interrupt
<0>[  782.619115] Kernel Offset: disabled


Crash log details,
https://qa-reports.linaro.org/~anders.roxell/linux-mainline-patches/build/lore_kernel_org_linux-block_20230404140835_25166-1-sergei_shtepa_veeam_com/testrun/16171777/suite/log-parser-test/test/check-kernel-panic/details/
https://qa-reports.linaro.org/~anders.roxell/linux-mainline-patches/build/lore_kernel_org_linux-block_20230404140835_25166-1-sergei_shtepa_veeam_com/testrun/16171777/suite/log-parser-test/test/check-kernel-panic/log

Build artifacts links,
https://storage.tuxsuite.com/public/linaro/anders/builds/2OGpRflnb14kT3aJdPte4NdjKoT/
vmlinux: https://storage.tuxsuite.com/public/linaro/anders/builds/2OGpRflnb14kT3aJdPte4NdjKoT/vmlinux.xz
System.map: https://storage.tuxsuite.com/public/linaro/anders/builds/2OGpRflnb14kT3aJdPte4NdjKoT/System.map


steps to reproduce:
# To install tuxrun on your system globally:
# sudo pip3 install -U tuxrun==0.41.0
#
# See https://tuxrun.org/ for complete documentation.

tuxrun   \
 --runtime podman   \
 --device qemu-i386   \
 --kernel https://storage.tuxsuite.com/public/linaro/anders/builds/2OGpRflnb14kT3aJdPte4NdjKoT/bzImage   \
 --modules https://storage.tuxsuite.com/public/linaro/anders/builds/2OGpRflnb14kT3aJdPte4NdjKoT/modules.tar.xz   \
 --rootfs https://storage.tuxsuite.com/public/linaro/lkft/oebuilds/2OFRZUbhWDZYvEcYrKKj1AJ618K/images/intel-core2-32/lkft-tux-image-intel-core2-32-20230410193126.rootfs.ext4.gz   \
 --parameters SKIPFILE=skipfile-lkft.yaml   \
 --parameters SHARD_NUMBER=10   \
 --parameters SHARD_INDEX=10   \
 --image docker.io/lavasoftware/lava-dispatcher:2023.01.0020.gc1598238f   \
 --tests ltp-controllers   \
 --timeouts boot=15 ltp-controllers=80


--
Linaro LKFT
https://lkft.linaro.org

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