Created attachment 300484 [details] dmesg (5.17-rc4, PowerMac G5 11,2) Don't know whether this has something to do or in common with a netconsole issue I unearthed on other hardware (bug #212509)... But as the trace looks different I'll post this as a seperate bug: [...] ======================================================== WARNING: possible irq lock inversion dependency detected 5.17.0-rc4-PowerMacG5+ #2 Not tainted -------------------------------------------------------- swapper/0/1 just changed the state of lock: c0000000013e4490 (native_tlbie_lock){+.-.}-{2:2}, at: .tlbie+0x70/0x10c but this lock was taken by another, HARDIRQ-safe lock in the past: (console_owner){-...}-{0:0} and interrupts could create inverse lock ordering between them. other info that might help us debug this: Chain exists of: console_owner --> target_list_lock --> native_tlbie_lock Possible interrupt unsafe locking scenario: CPU0 CPU1 ---- ---- lock(native_tlbie_lock); local_irq_disable(); lock(console_owner); lock(target_list_lock); <Interrupt> lock(console_owner); *** DEADLOCK *** no locks held by swapper/0/1. the shortest dependencies between 2nd lock and 1st lock: -> (console_owner){-...}-{0:0} ops: 994 { IN-HARDIRQ-W at: .lock_acquire+0x290/0x2e8 .console_unlock+0x2fc/0x628 .vprintk_emit+0x270/0x280 .vprintk+0x8c/0x94 ._printk+0x30/0x44 .crng_fast_load+0x128/0x17c .add_interrupt_randomness+0x330/0x488 .handle_irq_event_percpu+0x28/0x54 .handle_irq_event+0x44/0x70 .handle_fasteoi_irq+0xac/0x158 .handle_irq_desc+0x34/0x54 .__do_irq+0x174/0x250 .__do_IRQ+0xac/0xb4 init_stack+0x3820/0x4000 .do_IRQ+0xd0/0x124 hardware_interrupt_common_virt+0x208/0x210 .power4_idle+0x3c/0x70 .arch_cpu_idle+0x8c/0x114 .default_idle_call+0x7c/0xd4 .do_idle+0x118/0x12c .cpu_startup_entry+0x28/0x2c .rest_init+0x1bc/0x1c8 .start_kernel+0xba8/0xca0 start_here_common+0x1c/0x44 INITIAL USE at: .lock_acquire+0x290/0x2e8 .console_unlock+0x2fc/0x628 .vprintk_emit+0x270/0x280 .vprintk+0x8c/0x94 ._printk+0x30/0x44 .start_kernel+0xc4/0xca0 start_here_common+0x1c/0x44 } ... key at: [<c000000001430c30>] console_owner_dep_map+0x0/0x28 ... acquired at: ._raw_spin_lock_irqsave+0x6c/0x98 .write_msg+0x64/0x10c .console_unlock+0x53c/0x628 .register_console+0x250/0x330 .init_netconsole+0x538/0x610 .do_one_initcall+0x100/0x2dc .kernel_init_freeable+0x644/0x748 .kernel_init+0x20/0x178 .ret_from_kernel_thread+0x58/0x60 -> (target_list_lock){....}-{2:2} ops: 461 { INITIAL USE at: .lock_acquire+0x290/0x2e8 ._raw_spin_lock_irqsave+0x6c/0x98 .init_netconsole+0x40c/0x610 .do_one_initcall+0x100/0x2dc .kernel_init_freeable+0x644/0x748 .kernel_init+0x20/0x178 .ret_from_kernel_thread+0x58/0x60 } ... key at: [<c0000000014e8918>] target_list_lock+0x18/0x40 ... acquired at: ._raw_spin_lock+0x44/0x68 .tlbie+0x70/0x10c .native_hpte_invalidate+0xcc/0x114 .hash__kernel_map_pages+0x270/0x280 .debug_pagealloc_unmap_pages+0x34/0x40 .free_unref_page_prepare+0x2c8/0x314 .free_unref_page+0x38/0xdc .__free_slab+0xc4/0x158 .kfree_skbmem+0x5c/0x7c .zap_completion_queue+0x128/0x130 .netpoll_send_skb+0x2e0/0x348 .write_msg+0xfc/0x10c .console_unlock+0x53c/0x628 .vprintk_emit+0x270/0x280 .vprintk+0x8c/0x94 ._printk+0x30/0x44 .register_console+0x288/0x330 .init_netconsole+0x538/0x610 .do_one_initcall+0x100/0x2dc .kernel_init_freeable+0x644/0x748 .kernel_init+0x20/0x178 .ret_from_kernel_thread+0x58/0x60 -> (native_tlbie_lock){+.-.}-{2:2} ops: 4044007 { HARDIRQ-ON-W at: .lock_acquire+0x290/0x2e8 ._raw_spin_lock+0x44/0x68 .tlbie+0x70/0x10c .hash__change_memory_range+0xa8/0xc0 .hash__mark_initmem_nx+0x3c/0x58 .mark_initmem_nx+0x10/0x24 .free_initmem+0x24/0x5c .kernel_init+0x38/0x178 .ret_from_kernel_thread+0x58/0x60 IN-SOFTIRQ-W at: .lock_acquire+0x290/0x2e8 ._raw_spin_lock+0x44/0x68 .tlbie+0x70/0x10c .native_hpte_invalidate+0xcc/0x114 .hash__kernel_map_pages+0x270/0x280 .debug_pagealloc_unmap_pages+0x34/0x40 .free_unref_page_prepare+0x2c8/0x314 .free_unref_page+0x38/0xdc .__free_slab+0xc4/0x158 .free_object_rcu+0xac/0x138 .rcu_core+0x858/0x10b8 .__do_softirq+0x31c/0x484 .run_ksoftirqd+0x44/0x80 .smpboot_thread_fn+0x230/0x238 .kthread+0x110/0x118 .ret_from_kernel_thread+0x58/0x60 INITIAL USE at: .lock_acquire+0x290/0x2e8 ._raw_spin_lock+0x44/0x68 .tlbie+0x70/0x10c .native_hpte_invalidate+0xcc/0x114 .hash__kernel_map_pages+0x270/0x280 .debug_pagealloc_unmap_pages+0x34/0x40 .__free_pages_ok+0x174/0x2a0 .deferred_free_range+0x150/0x230 .deferred_init_maxorder+0x428/0x4e0 .deferred_grow_zone+0x238/0x2dc .get_page_from_freelist+0x204/0x7e4 .__alloc_pages+0xc4/0x23c .alloc_slab_page.constprop.0+0x70/0x78 .new_slab+0xcc/0x360 .__kmem_cache_create+0x210/0x3dc .create_boot_cache+0xa8/0x15c .kmem_cache_init+0x140/0x34c .start_kernel+0x708/0xca0 start_here_common+0x1c/0x44 } ... key at: [<c0000000013e4490>] native_tlbie_lock+0x18/0x40 ... acquired at: .__lock_acquire+0x64c/0x14d0 .lock_acquire+0x290/0x2e8 ._raw_spin_lock+0x44/0x68 .tlbie+0x70/0x10c .hash__change_memory_range+0xa8/0xc0 .hash__mark_initmem_nx+0x3c/0x58 .mark_initmem_nx+0x10/0x24 .free_initmem+0x24/0x5c .kernel_init+0x38/0x178 .ret_from_kernel_thread+0x58/0x60 stack backtrace: CPU: 1 PID: 1 Comm: swapper/0 Not tainted 5.17.0-rc4-PowerMacG5+ #2 Call Trace: [c000000002973610] [c000000000552e8c] .dump_stack_lvl+0x98/0xe0 (unreliable) [c0000000029736a0] [c0000000000c7534] .print_irq_inversion_bug+0x1a8/0x220 [c000000002973750] [c0000000000c81a4] .mark_lock+0x2c8/0x3d8 [c000000002973860] [c0000000000c9818] .__lock_acquire+0x64c/0x14d0 [c000000002973980] [c0000000000cb0c8] .lock_acquire+0x290/0x2e8 [c000000002973a90] [c00000000082ca64] ._raw_spin_lock+0x44/0x68 [c000000002973b10] [c00000000003abfc] .tlbie+0x70/0x10c [c000000002973bb0] [c000000000036874] .hash__change_memory_range+0xa8/0xc0 [c000000002973c50] [c000000000037124] .hash__mark_initmem_nx+0x3c/0x58 [c000000002973cc0] [c000000000033cb8] .mark_initmem_nx+0x10/0x24 [c000000002973d30] [c000000000033040] .free_initmem+0x24/0x5c [c000000002973da0] [c00000000001084c] .kernel_init+0x38/0x178 [c000000002973e10] [c00000000000bb70] .ret_from_kernel_thread+0x58/0x60 [...]
Created attachment 300485 [details] kernel .config (5.17-rc4, PowerMac G5 11,2)
Have not seen this on 5.18.x, 5.19.x nor on 6.0-rc. I think it's safe to close here.