> Here's a first attempt to address this bug. Could you please apply the > attached patch and report on the results? It should work against the > upcoming v6.13-rc1 or against a recent drm-misc-next. Hi. No luck yet. I collected crashes before the patch: BUG: Bad page map in process husband pte:60000001b46fcb pmd:800000002736403 page: refcount:1 mapcount:-1 mapping:000000005cb4182c index:0x6 pfn:0x1b46 aops:0xffff8000807722e0 ino:15 dentry name(?):"fb0" flags: 0x14(referenced|dirty|zone=0) raw: 0000000000000014 dead000000000100 dead000000000122 ffff0000018cf348 raw: 0000000000000006 0000000000000000 00000001fffffffe 0000000000000000 page dumped because: bad pte addr:0000ffff87b4e000 vm_flags:040400fb anon_vma:0000000000000000 mapping:ffff0000018cf348 index:6 file:fb0 fault:fb_deferred_io_fault mmap:fb_mmap read_folio:0x0 CPU: 2 UID: 0 PID: 313 Comm: husband Not tainted 6.12.0 #1 Hardware name: Raspberry Pi Compute Module 3 Rev 1.0 (DT) Call trace: show_stack+0x18/0x30 (C) dump_stack_lvl+0x60/0x80 dump_stack+0x18/0x24 print_bad_pte+0x174/0x1d0 unmap_page_range+0x47c/0xc90 unmap_vmas+0xa4/0x100 exit_mmap+0xbc/0x2c0 mmput+0x70/0x190 do_exit+0x248/0x8f0 do_group_exit+0x34/0x90 get_signal+0x834/0x860 do_signal+0xf4/0x330 do_notify_resume+0xc0/0x140 el0_svc+0xb8/0xd0 el0t_64_sync_handler+0x10c/0x140 el0t_64_sync+0x198/0x19c Disabling lock debugging due to kernel taint And after the patch: lk_smartMem abort info: /tmp/0c ESR = 0x0000000096000044 8081f6-1 EC = 0x25: DABT (current EL), IL = 32 bits 165-4fd2 SET = 0, FnV = 0 -5e4e03b EA = 0, S1PTW = 0 e-57fa8e FSC = 0x04: level 0 translation fault 22.dmp Data abort info: ISV = 0, ISS = 0x00000044, ISS2 = 0x00000000 CM = 0, WnR = 1, TnD = 0, TagAccess = 0 GCS = 0, Overlay = 0, DirtyBit = 0, Xs = 0 [ffbf801f8e7bf010] address between user and kernel address ranges Internal error: Oops: 0000000096000044 [#1] SMP CPU: 1 UID: 0 PID: 260 Comm: husband Not tainted 6.12.0 #1 Hardware name: Raspberry Pi Compute Module 3 Rev 1.0 (DT) pstate: 60000005 (nZCv daif -PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : tlb_remove_table+0xc8/0x1c0 lr : tlb_remove_table+0xc0/0x1c0 sp : ffff80008117b9d0 x29: ffff80008117b9d0 x28: ffff80008117bb98 x27: 0000aaaad1df8000 x26: 0000aaaad1df7fff x25: ffff0000044f4468 x24: 00000000ffffffdb x23: fffffdffc008f2c0 x22: ffff8000808a1860 x21: 0000aaaad1c00000 x20: fffffdffc008f2c0 x19: ffff80008117bb98 x18: ffff80008117bb50 x17: ffffffffffffffff x16: 0000000000000000 x15: ffff8000807b62a8 x14: 0000ffffb7640fff x13: 0000000000000000 x12: 0000000000000000 x11: 0000000000000000 x10: 0000000000000000 x9 : 0000000000037b6f x8 : ffff80008094a0e7 x7 : 0000000000000800 x6 : 0000000000000000 x5 : 0000000000000801 x4 : dead000000000122 x3 : 0000000000000000 x2 : 0000020040000000 x1 : ffff000000000000 x0 : ffbf801f8e7bf000 Call trace: tlb_remove_table+0xc8/0x1c0 (P) tlb_remove_table+0xc0/0x1c0 (L) free_pgd_range+0x228/0x5d0 free_pgtables+0x1c4/0x270 exit_mmap+0x130/0x2c0 mmput+0x70/0x190 do_exit+0x248/0x8f0 do_group_exit+0x34/0x90 get_signal+0x834/0x860 do_signal+0x118/0x330 do_notify_resume+0xc0/0x140 el0_svc+0xb8/0xd0 el0t_64_sync_handler+0x10c/0x140 el0t_64_sync+0x198/0x19c Code: 52850000 94006fdd f9000660 b4000080 (b900101f) ---[ end trace 0000000000000000 ]--- Fixing recursive fault but reboot is needed! Unable to handle kernel NULL pointer dereference at virtual address 0000000000000008 Mem abort info: ESR = 0x0000000096000044 EC = 0x25: DABT (current EL), IL = 32 bits SET = 0, FnV = 0 EA = 0, S1PTW = 0 FSC = 0x04: level 0 translation fault Data abort info: ISV = 0, ISS = 0x00000044, ISS2 = 0x00000000 CM = 0, WnR = 1, TnD = 0, TagAccess = 0 GCS = 0, Overlay = 0, DirtyBit = 0, Xs = 0 user pgtable: 4k pages, 48-bit VAs, pgdp=000000000238c000 [0000000000000008] pgd=0000000000000000, p4d=0000000000000000 Internal error: Oops: 0000000096000044 [#2] SMP CPU: 0 UID: 0 PID: 0 Comm: swapper/0 Tainted: G D 6.12.0 #1 Tainted: [D]=DIE Hardware name: Raspberry Pi Compute Module 3 Rev 1.0 (DT) pstate: a0000005 (NzCv daif -PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : free_unref_page_commit+0x70/0x2c0 lr : free_unref_page+0x17c/0x400 sp : ffff800080003da0 x29: ffff800080003da0 x28: 0000000000000000 x27: 0000000000000000 x26: 0000000000000000 x25: ffff00003e39e0b8 x24: 0000000000000000 x23: 0000000000000000 x22: 00000000ffffffff x21: ffff00003e39efc0 x20: 0000000000000000 x19: ffff800080add340 x18: ffff800081163c40 x17: ffff7fffbda55000 x16: ffff800080000000 x15: 0000000000001900 x14: 00000f423fffe700 x13: 0000000000000000 x12: ffff00003e39efc0 x11: 0000000000000001 x10: 0000000000000001 x9 : ffff7fffbda55000 x8 : fffffdffc00e81c8 x7 : ffff00003e39efe0 x6 : 0000000000000020 x5 : ffff00003e39efc0 x4 : 00000000ffffffff x3 : 0000000000000000 x2 : fffffdffc00e81c0 x1 : 0000000000000000 x0 : ffff800080add340 Call trace: free_unref_page_commit+0x70/0x2c0 (P) free_unref_page+0x17c/0x400 (L) free_unref_page+0x17c/0x400 __folio_put+0x50/0xb0 tlb_remove_table_rcu+0xb0/0xc0 rcu_core+0x1f4/0x520 rcu_core_si+0x10/0x20 handle_softirqs+0xf4/0x230 __do_softirq+0x14/0x20 ____do_softirq+0x10/0x20 call_on_irq_stack+0x24/0x54 do_softirq_own_stack+0x1c/0x30 __irq_exit_rcu+0xc8/0x100 irq_exit_rcu+0x10/0x20 el1_interrupt+0x38/0x60 el1h_64_irq_handler+0x18/0x30 el1h_64_irq+0x6c/0x70 default_idle_call+0x28/0x3c (P) default_idle_call+0x24/0x3c (L) do_idle+0x9c/0xf0 cpu_startup_entry+0x34/0x40 rest_init+0xb8/0xc0 do_one_initcall+0x0/0x16c __primary_switched+0x88/0x90 Code: 8b2ac0e7 f8296827 8b0600a7 f9401181 (f9000428) ---[ end trace 0000000000000000 ]--- Kernel panic - not syncing: Oops: Fatal exception in interrupt SMP: stopping secondary CPUs Kernel Offset: disabled CPU features: 0x000,00000c00,00800000,0200420b Memory Limit: none ---[ end Kernel panic - not syncing: Oops: Fatal exception in interrupt ]--- Thanks, Nuno
