>However during the weekend mglru-enabled run (with above fix to >isolate_lru_folios() and also the previous two patches: truncate.patch >and mglru.patch and the inode fix provided by Mateusz), another hard >lockup related to lruvec spinlock was observed. > >Here is the hardlock up: > >watchdog: Watchdog detected hard LOCKUP on cpu 466 >CPU: 466 PID: 3103929 Comm: fio Not tainted >6.10.0-rc3-trnct_nvme_lruvecresched_sirq_inode_mglru #32 >RIP: 0010:native_queued_spin_lock_slowpath+0x2b4/0x300 >Call Trace: > <NMI> > ? show_regs+0x69/0x80 > ? watchdog_hardlockup_check+0x1b4/0x3a0 ><SNIP> > ? native_queued_spin_lock_slowpath+0x2b4/0x300 > </NMI> > <IRQ> > _raw_spin_lock_irqsave+0x5b/0x70 > folio_lruvec_lock_irqsave+0x62/0x90 > folio_batch_move_lru+0x9d/0x160 > folio_rotate_reclaimable+0xab/0xf0 > folio_end_writeback+0x60/0x90 > end_buffer_async_write+0xaa/0xe0 > end_bio_bh_io_sync+0x2c/0x50 > bio_endio+0x108/0x180 > blk_mq_end_request_batch+0x11f/0x5e0 > nvme_pci_complete_batch+0xb5/0xd0 [nvme] > nvme_irq+0x92/0xe0 [nvme] > __handle_irq_event_percpu+0x6e/0x1e0 > handle_irq_event+0x39/0x80 > handle_edge_irq+0x8c/0x240 > __common_interrupt+0x4e/0xf0 > common_interrupt+0x49/0xc0 > asm_common_interrupt+0x27/0x40 > >Here is the lock holder details captured by all-cpu-backtrace: > >NMI backtrace for cpu 75 >CPU: 75 PID: 3095650 Comm: fio Not tainted >6.10.0-rc3-trnct_nvme_lruvecresched_sirq_inode_mglru #32 >RIP: 0010:folio_inc_gen+0x142/0x430 >Call Trace: > <NMI> > ? show_regs+0x69/0x80 > ? nmi_cpu_backtrace+0xc5/0x130 > ? nmi_cpu_backtrace_handler+0x11/0x20 > ? nmi_handle+0x64/0x180 > ? default_do_nmi+0x45/0x130 > ? exc_nmi+0x128/0x1a0 > ? end_repeat_nmi+0xf/0x53 > ? folio_inc_gen+0x142/0x430 > ? folio_inc_gen+0x142/0x430 > ? folio_inc_gen+0x142/0x430 > </NMI> > <TASK> > isolate_folios+0x954/0x1630 > evict_folios+0xa5/0x8c0 > try_to_shrink_lruvec+0x1be/0x320 > shrink_one+0x10f/0x1d0 > shrink_node+0xa4c/0xc90 > do_try_to_free_pages+0xc0/0x590 > try_to_free_pages+0xde/0x210 > __alloc_pages_noprof+0x6ae/0x12c0 > alloc_pages_mpol_noprof+0xd9/0x220 > folio_alloc_noprof+0x63/0xe0 > filemap_alloc_folio_noprof+0xf4/0x100 > page_cache_ra_unbounded+0xb9/0x1a0 > page_cache_ra_order+0x26e/0x310 > ondemand_readahead+0x1a3/0x360 > page_cache_sync_ra+0x83/0x90 > filemap_get_pages+0xf0/0x6a0 > filemap_read+0xe7/0x3d0 > blkdev_read_iter+0x6f/0x140 > vfs_read+0x25b/0x340 > ksys_read+0x67/0xf0 > __x64_sys_read+0x19/0x20 > x64_sys_call+0x1771/0x20d0 > do_syscall_64+0x7e/0x130
