Comment # 17
on bug 104825
from mlen
No issues on drm-next-4.17-wip, unbinding works without any lockdep issues. Do you plan to backport these changes to 4.16 or maybe even 4.15? For the record, suspend fails on drm-next-4.17-wip. This could be possibly related, but I don't know how to debug this and most likely this is out of scope of this bug. [ 96.222095] PM: suspend entry (deep) [ 96.222099] PM: Syncing filesystems ... done. [ 96.230020] INFO: trying to register non-static key. [ 96.230024] the code is fine but needs lockdep annotation. [ 96.230026] turning off the locking correctness validator. [ 96.230029] CPU: 39 PID: 4506 Comm: pm-suspend Not tainted 4.16.0-rc7+ #2 [ 96.230031] Hardware name: ASUSTeK COMPUTER INC. Z10PE-D16 WS/Z10PE-D16 WS, BIOS 3407 03/10/2017 [ 96.230033] Call Trace: [ 96.230040] dump_stack+0x46/0x59 [ 96.230046] register_lock_class+0x192/0x361 [ 96.230050] ? cycles_2_ns+0x55/0x75 [ 96.230054] __lock_acquire.isra.30+0x97/0x595 [ 96.230057] lock_acquire+0x105/0x12e [ 96.230060] ? devres_for_each_res+0x41/0xc4 [ 96.230064] ? __fw_entry_found+0x3b/0x3b [ 96.230068] _raw_spin_lock_irqsave+0x3d/0x74 [ 96.230071] ? devres_for_each_res+0x41/0xc4 [ 96.230073] ? kref_get+0xa/0xa [ 96.230075] ? alloc_fw_cache_entry+0x4e/0x4e [ 96.230077] devres_for_each_res+0x41/0xc4 [ 96.230096] dev_cache_fw_image+0x59/0x11d [ 96.230098] ? fw_pm_notify+0xd1/0xd1 [ 96.230102] dpm_for_each_dev+0x41/0x58 [ 96.230104] fw_pm_notify+0xac/0xd1 [ 96.230108] notifier_call_chain+0x39/0x5a [ 96.230127] __blocking_notifier_call_chain+0x4e/0x65 [ 96.230130] __pm_notifier_call_chain+0x1b/0x2f [ 96.230133] pm_suspend+0x15b/0x2c1 [ 96.230135] state_store+0x4b/0x7e [ 96.230140] kernfs_fop_write+0x114/0x15c [ 96.230145] __vfs_write+0x33/0xd7 [ 96.230148] ? __sb_start_write+0x94/0x180 [ 96.230150] ? __sb_start_write+0xc0/0x180 [ 96.230153] vfs_write+0xa5/0xe2 [ 96.230156] SyS_write+0x5f/0xa3 [ 96.230160] do_syscall_64+0x79/0x88 [ 96.230164] entry_SYSCALL_64_after_hwframe+0x3d/0xa2 [ 96.230166] RIP: 0033:0x7fac7a914468 [ 96.230168] RSP: 002b:00007ffea25554e0 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 [ 96.230171] RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 00007fac7a914468 [ 96.230172] RDX: 0000000000000004 RSI: 0000558679eb4500 RDI: 0000000000000001 [ 96.230174] RBP: 0000558679eb4500 R08: 000000000000000a R09: 0000558679eeb6b0 [ 96.230175] R10: 00007fac7a9a5b20 R11: 0000000000000246 R12: 0000000000000004 [ 96.230177] R13: 0000000000000001 R14: 00007fac7abe1740 R15: 0000000000000004 [ 96.230183] BUG: unable to handle kernel NULL pointer dereference at 0000000000000008 [ 96.230189] IP: devres_for_each_res+0x59/0xc4 [ 96.230191] PGD 0 P4D 0 [ 96.230196] Oops: 0000 [#1] PREEMPT SMP PTI [ 96.230199] Modules linked in: [ 96.230203] CPU: 39 PID: 4506 Comm: pm-suspend Not tainted 4.16.0-rc7+ #2 [ 96.230205] Hardware name: ASUSTeK COMPUTER INC. Z10PE-D16 WS/Z10PE-D16 WS, BIOS 3407 03/10/2017 [ 96.230208] RIP: 0010:devres_for_each_res+0x59/0xc4 [ 96.230210] RSP: 0018:ffffa63689fabc70 EFLAGS: 00010086 [ 96.230214] RAX: 0000000000000000 RBX: ffff9fd574d4ad98 RCX: ffff9fd574d4b1f0 [ 96.230216] RDX: ffff9fd576ea0918 RSI: ffff9fd574d4b1c0 RDI: ffff9fd576ea0918 [ 96.230218] RBP: ffffffffa8951b3a R08: 0000000000000000 R09: 0000000000000000 [ 96.230221] R10: ffff9fd576ea0000 R11: ffffffffab22aa07 R12: ffffffffa8951f44 [ 96.230223] R13: dead000000000100 R14: ffffffffa8951c08 R15: ffff9fd574d4b1a8 [ 96.230226] FS: 00007fac7b021740(0000) GS:ffff9fe57f400000(0000) knlGS:0000000000000000 [ 96.230229] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 96.230231] CR2: 0000000000000008 CR3: 000000202a4a8002 CR4: 00000000003606e0 [ 96.230233] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 96.230236] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 96.230238] Call Trace: [ 96.230243] dev_cache_fw_image+0x59/0x11d [ 96.230247] ? fw_pm_notify+0xd1/0xd1 [ 96.230250] dpm_for_each_dev+0x41/0x58 [ 96.230253] fw_pm_notify+0xac/0xd1 [ 96.230256] notifier_call_chain+0x39/0x5a [ 96.230261] __blocking_notifier_call_chain+0x4e/0x65 [ 96.230264] __pm_notifier_call_chain+0x1b/0x2f [ 96.230267] pm_suspend+0x15b/0x2c1 [ 96.230271] state_store+0x4b/0x7e [ 96.230275] kernfs_fop_write+0x114/0x15c [ 96.230279] __vfs_write+0x33/0xd7 [ 96.230284] ? __sb_start_write+0x94/0x180 [ 96.230286] ? __sb_start_write+0xc0/0x180 [ 96.230290] vfs_write+0xa5/0xe2 [ 96.230295] SyS_write+0x5f/0xa3 [ 96.230299] do_syscall_64+0x79/0x88 [ 96.230303] entry_SYSCALL_64_after_hwframe+0x3d/0xa2 [ 96.230305] RIP: 0033:0x7fac7a914468 [ 96.230308] RSP: 002b:00007ffea25554e0 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 [ 96.230311] RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 00007fac7a914468 [ 96.230313] RDX: 0000000000000004 RSI: 0000558679eb4500 RDI: 0000000000000001 [ 96.230316] RBP: 0000558679eb4500 R08: 000000000000000a R09: 0000558679eeb6b0 [ 96.230318] R10: 00007fac7a9a5b20 R11: 0000000000000246 R12: 0000000000000004 [ 96.230320] R13: 0000000000000001 R14: 00007fac7abe1740 R15: 0000000000000004 [ 96.230326] Code: 48 83 ec 28 48 89 4c 24 18 4c 89 4c 24 20 e8 ca 7d 4b 00 48 8d 8b 58 04 00 00 48 89 44 24 08 48 8b 83 60 04 00 00 48 89 4c 24 10 <4c> 8b 68 08 48 3b 44 24 10 74 44 4c 3b 70 10 75 35 48 83 c0 28 [ 96.230390] RIP: devres_for_each_res+0x59/0xc4 RSP: ffffa63689fabc70 [ 96.230392] CR2: 0000000000000008 [ 96.230395] ---[ end trace 43f33fa700a0efa9 ]--- [ 96.233392] note: pm-suspend[4506] exited with preempt_count 1
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