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 3ELMST4L 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right now :) So I wonder if related or a coincidence caused by something else? This is triggered by the mm self-test (in tools/testing/selftests/mm, you can just make -jXX there) transhuge-stress, invoked as: $ sudo ./transhuge-stress -d 20 The stack traces do look very different though so perhaps unrelated? Cheers, Lorenzo [0]: https://lore.kernel.org/linux-mm/ef5f6776-b405-48e8-9fa9-c56af392bc4f@lucifer.local/#t On Mon, May 12, 2025 at 04:18:06PM +0200, Marc Hartmayer wrote: > Hi all, > > In a QEMU/KVM guest with 2 vCPUs, when running a test that > enables/disables a vCPU by writing 0 and 1 to the sysfs > `/sys/devices/system/cpu/cpu1/online` in a endless loop and doing some > `dd` operations (block size of 1MB) in the guest in parallel, I > sometimes see the kernel warning: > > "page type is 0, migratetype passed is 2 (nr=256)" > > The first time this happened was after the warning was added with commit > e0932b6c1f94 (mm: page_alloc: consolidate free page accounting"). > > Below is a "beautified" (via `decode_stacktrace.sh`) kernel stack trace > (note: it's a self-compiled kernel using the debug config + Linux > v6.15-rc5 + an unrelated patch on top): > > ``` > [ 31.079925] page type is 0, passed migratetype is 2 (nr=256) > [ 31.079967] WARNING: CPU: 0 PID: 512 at mm/page_alloc.c:668 expand (mm/page_alloc.c:668 (discriminator 2) mm/page_alloc.c:1576 (discriminator 2)) > [ 31.079974] Modules linked in: essiv authenc dm_crypt encrypted_keys loop pkey_pckmo pkey diag288_wdt watchdog rng_core ghash_s390 prng aes_s390 des_s390 libdes vmw_vsock_virtio_transport vmw_vsock_virtio_transport_common vsock virtio_console vfio_ccw mdev vfio_iommu_type1 sha512_s390 sha256_s390 vfio sha1_s390 sha_common sch_fq_codel drm i2c_core drm_panel_orientation_quirks nfnetlink autofs4 ecdsa_generic ecc > [ 31.080051] Hardware name: IBM 2964 NC9 702 (KVM/Linux) > [ 31.080055] Krnl PSW : 0404f00180000000 000003339b22f52c expand (mm/page_alloc.c:668 (discriminator 10) mm/page_alloc.c:1576 (discriminator 10)) > [ 31.080064] R:0 T:1 IO:0 EX:0 Key:0 M:1 W:0 P:0 AS:3 CC:3 PM:0 RI:0 EA:3 > [ 31.080071] Krnl GPRS: 0000033380000004 0000000000000005 0000000000000030 00000333ffffffff > [ 31.080075] 0000000000000005 0000033380000005 0000000000000100 0000000000000008 > [ 31.080080] 000003339cf5e290 00000229260c99d8 ffffffff00000008 000002a8827cc000 > [ 31.080084] 000003ffb7d50b58 0000000000000008 000003339b22f528 000002b39be17240 > [ 31.080095] Krnl Code: 000003339b22f51c: c02000936173 larl %r2,000003339c49b802 > > Code starting with the faulting instruction > =========================================== > [ 31.080095] 000003339b22f522: c0e5ffe40e37 brasl %r14,000003339aeb1190 > [ 31.080095] #000003339b22f528: af000000 mc 0,0 > [ 31.080095] >000003339b22f52c: a7f4ff49 brc 15,000003339b22f3be > [ 31.080095] 000003339b22f530: b904002b lgr %r2,%r11 > [ 31.080095] 000003339b22f534: c03000933a81 larl %r3,000003339c496a36 > [ 31.080095] 000003339b22f53a: c0e5fffdaad3 brasl %r14,000003339b1e4ae0 > [ 31.080095] 000003339b22f540: af000000 mc 0,0 > [ 31.080123] Call Trace: > [ 31.080126] expand (mm/page_alloc.c:668 (discriminator 10) mm/page_alloc.c:1576 (discriminator 10)) > [ 31.080132] expand (mm/page_alloc.c:668 (discriminator 2) mm/page_alloc.c:1576 (discriminator 2)) > [ 31.080137] rmqueue_bulk (mm/page_alloc.c:646 mm/page_alloc.c:1592 mm/page_alloc.c:1762 mm/page_alloc.c:2315 mm/page_alloc.c:2368) > [ 31.080142] __rmqueue_pcplist (mm/page_alloc.c:3090) > [ 31.080147] rmqueue.isra.0 (mm/page_alloc.c:3128 mm/page_alloc.c:3159) > [ 31.080153] get_page_from_freelist (mm/page_alloc.c:3687) > [ 31.080158] __alloc_frozen_pages_noprof (mm/page_alloc.c:4971 (discriminator 1)) > [ 31.080164] alloc_pages_mpol (mm/mempolicy.c:2303 (discriminator 1)) > [ 31.080170] alloc_frozen_pages_noprof (mm/mempolicy.c:2374) > [ 31.080176] allocate_slab (mm/slub.c:2454 mm/slub.c:2618) > [ 31.080182] ___slab_alloc (mm/slub.c:2672 mm/slub.c:3858) > [ 31.080187] __slab_alloc.isra.0 (mm/slub.c:3948) > [ 31.080193] kmem_cache_alloc_noprof (mm/slub.c:4023 mm/slub.c:4184 mm/slub.c:4203) > [ 31.080199] alloc_buffer_head (fs/buffer.c:3033) > [ 31.080204] folio_alloc_buffers (fs/buffer.c:938) > [ 31.080212] create_empty_buffers (fs/buffer.c:1697) > [ 31.080217] __block_write_begin_int (./include/linux/pagemap.h:1025 fs/buffer.c:2134) > [ 31.080222] iomap_write_begin (fs/iomap/buffered-io.c:825) > [ 31.080228] iomap_write_iter (fs/iomap/buffered-io.c:952) > [ 31.080234] iomap_file_buffered_write (fs/iomap/buffered-io.c:1033 (discriminator 1)) > [ 31.080240] blkdev_write_iter (block/fops.c:690 block/fops.c:755) > [ 31.080246] vfs_write (fs/read_write.c:592 (discriminator 1) fs/read_write.c:684 (discriminator 1) fs/read_write.c:664 > (discriminator 1)) > [ 31.080251] ksys_write (fs/read_write.c:737) > [ 31.080257] __do_syscall (arch/s390/kernel/syscall.c:125 (discriminator 2)) > [ 31.080262] system_call (arch/s390/kernel/entry.S:263) > [ 31.080268] INFO: lockdep is turned off. > [ 31.080272] Last Breaking-Event-Address: > [ 31.080275] __s390_indirect_jump_r14 (arch/s390/lib/expoline.S:12) > [ 31.080284] Kernel panic - not syncing: kernel: panic_on_warn set ... > [ 31.080294] Hardware name: IBM 2964 NC9 702 (KVM/Linux) > [ 31.080297] Call Trace: > [ 31.080300] dump_stack_lvl (lib/dump_stack.c:122) > [ 31.080305] panic (kernel/panic.c:372) > [ 31.080310] check_panic_on_warn (kernel/panic.c:247) > [ 31.080315] __warn (kernel/panic.c:751) > [ 31.080321] report_bug (lib/bug.c:176 lib/bug.c:215) > [ 31.080327] monitor_event_exception (arch/s390/kernel/traps.c:227 (discriminator 1)) > [ 31.080333] __do_pgm_check (./arch/s390/include/asm/irqflags.h:48 (discriminator 1) ./arch/s390/include/asm/irqflags.h:86 (discriminator 1) arch/s390/kernel/traps.c:347 (discriminator 1)) > [ 31.080338] pgm_check_handler (arch/s390/kernel/entry.S:334) > [ 31.080344] expand (mm/page_alloc.c:668 (discriminator 10) mm/page_alloc.c:1576 (discriminator 10)) > [ 31.080349] expand (mm/page_alloc.c:668 (discriminator 2) mm/page_alloc.c:1576 (discriminator 2)) > [ 31.080353] rmqueue_bulk (mm/page_alloc.c:646 mm/page_alloc.c:1592 mm/page_alloc.c:1762 mm/page_alloc.c:2315 mm/page_a > lloc.c:2368) > [ 31.080359] __rmqueue_pcplist (mm/page_alloc.c:3090) > [ 31.080364] rmqueue.isra.0 (mm/page_alloc.c:3128 mm/page_alloc.c:3159) > [ 31.080369] get_page_from_freelist (mm/page_alloc.c:3687) > [ 31.080374] __alloc_frozen_pages_noprof (mm/page_alloc.c:4971 (discriminator 1)) > [ 31.080380] alloc_pages_mpol (mm/mempolicy.c:2303 (discriminator 1)) > [ 31.080385] alloc_frozen_pages_noprof (mm/mempolicy.c:2374) > [ 31.080390] allocate_slab (mm/slub.c:2454 mm/slub.c:2618) > [ 31.080396] ___slab_alloc (mm/slub.c:2672 mm/slub.c:3858) > [ 31.080401] __slab_alloc.isra.0 (mm/slub.c:3948) > [ 31.080407] kmem_cache_alloc_noprof (mm/slub.c:4023 mm/slub.c:4184 mm/slub.c:4203) > [ 31.080412] alloc_buffer_head (fs/buffer.c:3033) > [ 31.080417] folio_alloc_buffers (fs/buffer.c:938) > [ 31.080422] create_empty_buffers (fs/buffer.c:1697) > [ 31.080427] __block_write_begin_int (./include/linux/pagemap.h:1025 fs/buffer.c:2134) > [ 31.080433] iomap_write_begin (fs/iomap/buffered-io.c:825) > [ 31.080438] iomap_write_iter (fs/iomap/buffered-io.c:952) > [ 31.080444] iomap_file_buffered_write (fs/iomap/buffered-io.c:1033 (discriminator 1)) > [ 31.080449] blkdev_write_iter (block/fops.c:690 block/fops.c:755) > [ 31.080455] vfs_write (fs/read_write.c:592 (discriminator 1) fs/read_write.c:684 (discriminator 1) fs/read_write.c:664 > (discriminator 1)) > [ 31.080460] ksys_write (fs/read_write.c:737) > [ 31.080465] __do_syscall (arch/s390/kernel/syscall.c:125 (discriminator 2)) > [ 31.080470] system_call (arch/s390/kernel/entry.S:263) > [ 31.080476] INFO: lockdep is turned off. > ``` > > Any ideas? > > -- > Thanks in advance, > > Marc > >