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SubjectRe: media: vimc-debayer: lock problem
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Hi Randy,

On 9/14/19 11:16 PM, Randy Dunlap wrote:
> Kernel is 5.3-rc8 on x86_64.
>
> Loading, unloading, and then loading the vimc-debayer module causes:
>
>
> [ 793.542496] ------------[ cut here ]------------
> [ 793.542518] DEBUG_LOCKS_WARN_ON(lock->magic != lock)
> [ 793.542536] WARNING: CPU: 3 PID: 2029 at ../kernel/locking/mutex.c:912 __mutex_lock+0xd7c/0x1480
> [ 793.542559] Modules linked in: vimc_debayer(+) vimc_capture vimc_scaler vimc_sensor v4l2_tpg vimc v4l2_common ccm xt_tcpudp ip6t_rpfilter ip6t_REJECT nf_reject_ipv6 ipt_REJECT nf_reject_ipv4 af_packet xt_conntrack ip_set nfnetlink ebtable_nat ebtable_broute ip6table_nat ip6table_mangle ip6table_raw ip6table_security iptable_nat scsi_transport_iscsi nf_nat nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 iptable_mangle iptable_raw iptable_security ebtable_filter ebtables ip6table_filter ip6_tables iptable_filter ip_tables x_tables bpfilter coretemp hwmon intel_rapl_msr intel_rapl_common x86_pkg_temp_thermal intel_powerclamp kvm_intel kvm irqbypass crct10dif_pclmul crc32_generic crc32_pclmul ghash_clmulni_intel msr ghash_generic gf128mul uvcvideo hid_generic btrfs videobuf2_vmalloc gcm videobuf2_memops xor videobuf2_v4l2 iTCO_wdt zstd_compress videobuf2_common videodev iTCO_vendor_support usbmouse usb_debug mei_hdcp usbserial xts raid6_pq mc usbhid libcrc32c crc32c_intel hid
> [ 793.542617] zstd_decompress iwldvm ctr snd_hda_codec_hdmi aesni_intel mac80211 aes_x86_64 snd_hda_codec_realtek crypto_simd snd_hda_codec_generic cryptd ledtrig_audio glue_helper libarc4 snd_hda_intel intel_cstate iwlwifi snd_hda_codec intel_uncore intel_rapl_perf snd_hda_core joydev snd_hwdep input_leds cfg80211 mousedev sdhci_pci toshiba_acpi cqhci sparse_keymap sr_mod snd_pcm uio_pdrv_genirq sdhci uio snd_timer wmi serio_raw pcspkr mmc_core cdrom rfkill led_class snd rtc_cmos mei_me industrialio evdev mei thermal lpc_ich mac_hid soundcore toshiba_haps ac battery sg dm_multipath dm_mod scsi_dh_rdac scsi_dh_emc scsi_dh_alua autofs4 [last unloaded: vimc_debayer]
> [ 793.542817] CPU: 3 PID: 2029 Comm: modprobe Not tainted 5.3.0-rc8 #3
> [ 793.542829] Hardware name: TOSHIBA PORTEGE R835/Portable PC, BIOS Version 4.10 01/08/2013
> [ 793.542845] RIP: 0010:__mutex_lock+0xd7c/0x1480
> [ 793.542857] Code: d2 0f 85 35 05 00 00 44 8b 0d 50 7f b2 01 45 85 c9 0f 85 b1 f3 ff ff 48 c7 c6 60 15 89 9c 48 c7 c7 00 14 89 9c e8 b4 86 eb fd <0f> 0b e9 97 f3 ff ff 48 8b 85 88 fe ff ff 48 c1 e8 03 42 80 3c 28
> [ 793.542882] RSP: 0018:ffff88812a5eefd0 EFLAGS: 00010282
> [ 793.542894] RAX: dffffc0000000008 RBX: ffffffffc1c0f7e0 RCX: ffffffff9a2b67f4
> [ 793.542906] RDX: 1ffffffff3a3dfc5 RSI: 0000000000000004 RDI: 0000000000000246
> [ 793.542919] RBP: ffff88812a5ef150 R08: fffffbfff3a3dfc5 R09: fffffbfff3a3dfc5
> [ 793.542931] R10: 0000000000000001 R11: fffffbfff3a3dfc4 R12: 0000000000000000
> [ 793.542944] R13: 0000000000000000 R14: dffffc0000000000 R15: ffffffff9e700400
> [ 793.542957] FS: 00007f080c4a6b80(0000) GS:ffff88812aa00000(0000) knlGS:0000000000000000
> [ 793.542970] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> [ 793.542981] CR2: 00007ffeab8adee8 CR3: 000000010fd66005 CR4: 00000000000606e0
> [ 793.542993] Call Trace:
> [ 793.543007] ? do_raw_spin_unlock+0x54/0x220
> [ 793.543026] ? media_device_register_entity+0x1fd/0x710 [mc]
> [ 793.543044] ? mutex_lock_io_nested+0x1380/0x1380
> [ 793.543055] ? ida_alloc_range+0x5b7/0x6e0
> [ 793.543068] ? ida_destroy+0x260/0x260
> [ 793.543080] ? save_stack+0x21/0x90
> [ 793.543090] ? __kasan_kmalloc.constprop.8+0xa7/0xd0
> [ 793.543101] ? kasan_kmalloc+0x9/0x10
> [ 793.543111] ? __kmalloc+0x11f/0x260
> [ 793.543123] ? vimc_pads_init+0x33/0x130 [vimc]
> [ 793.543134] ? vimc_ent_sd_register+0x36/0x350 [vimc]
> [ 793.543147] ? vimc_sen_comp_bind+0x280/0x520 [vimc_sensor]
> [ 793.543160] ? component_bind_all+0x2ef/0xa60
> [ 793.543171] ? vimc_comp_bind+0x74/0x630 [vimc]
> [ 793.543188] ? driver_probe_device+0xf0/0x3a0
> [ 793.543199] ? device_driver_attach+0xec/0x120
> [ 793.543212] mutex_lock_nested+0x16/0x20
> [ 793.543223] ? mutex_lock_nested+0x16/0x20
> [ 793.543236] media_device_register_entity+0x1fd/0x710 [mc]
> [ 793.543249] ? __x64_sys_finit_module+0x6e/0xb0
> [ 793.543260] ? do_syscall_64+0xaa/0x380
> [ 793.543271] ? check_object+0xb2/0x300
> [ 793.543282] ? vimc_pads_init+0x33/0x130 [vimc]
> [ 793.543296] ? media_device_unregister_entity_notify+0xf0/0xf0 [mc]
> [ 793.543311] ? ___slab_alloc+0x5b3/0x600
> [ 793.543321] ? ___slab_alloc+0x5b3/0x600
> [ 793.543335] ? kasan_unpoison_shadow+0x35/0x50
> [ 793.543346] ? __kasan_kmalloc.constprop.8+0xa7/0xd0
> [ 793.543358] ? kasan_kmalloc+0x9/0x10
> [ 793.543377] v4l2_device_register_subdev+0x261/0x620 [videodev]
> [ 793.543392] vimc_ent_sd_register+0x26b/0x350 [vimc]
> [ 793.543406] vimc_sen_comp_bind+0x280/0x520 [vimc_sensor]
> [ 793.543421] component_bind_all+0x2ef/0xa60
> [ 793.543433] ? refcount_inc_checked+0xa/0x50
> [ 793.543446] ? vimc_comp_unbind+0x60/0x60 [vimc]
> [ 793.543459] vimc_comp_bind+0x74/0x630 [vimc]
> [ 793.543471] ? devres_open_group+0x2a0/0x460
> [ 793.543483] ? vimc_comp_unbind+0x60/0x60 [vimc]
> [ 793.543499] try_to_bring_up_master+0x586/0x960
> [ 793.543515] __component_add+0x202/0x520
> [ 793.543527] ? sysfs_do_create_link_sd+0x8c/0x110
> [ 793.543540] component_add+0xb/0x10
> [ 793.543552] vimc_deb_probe+0x14/0x20 [vimc_debayer]
> [ 793.543565] platform_drv_probe+0xbb/0x210
> [ 793.543577] really_probe+0x516/0xb00
> [ 793.543589] driver_probe_device+0xf0/0x3a0
> [ 793.543601] ? mutex_lock_nested+0x16/0x20
> [ 793.543613] device_driver_attach+0xec/0x120
> [ 793.543625] __driver_attach+0x108/0x270
> [ 793.543636] ? device_driver_attach+0x120/0x120
> [ 793.543648] bus_for_each_dev+0x116/0x1b0
> [ 793.543659] ? klist_add_tail+0x2f/0xe0
> [ 793.543669] ? subsys_dev_iter_init+0xe0/0xe0
> [ 793.543681] ? do_raw_spin_unlock+0x54/0x220
> [ 793.543692] ? _raw_spin_unlock+0x22/0x40
> [ 793.543704] driver_attach+0x38/0x50
> [ 793.543715] bus_add_driver+0x44e/0x6a0
> [ 793.543727] driver_register+0x18e/0x410
> [ 793.543738] ? 0xffffffffc1c88000
> [ 793.543748] ? 0xffffffffc1c88000
> [ 793.543759] __platform_driver_register+0xc8/0x110
> [ 793.543772] vimc_deb_pdrv_init+0x17/0x1000 [vimc_debayer]
> [ 793.543785] do_one_initcall+0xab/0x2d5
> [ 793.543796] ? initcall_blacklisted+0x190/0x190
> [ 793.543807] ? kasan_unpoison_shadow+0x35/0x50
> [ 793.543819] ? kasan_unpoison_shadow+0x35/0x50
> [ 793.543830] ? kasan_unpoison_shadow+0x35/0x50
> [ 793.543841] ? kasan_poison_shadow+0x2f/0x40
> [ 793.543852] ? __asan_register_globals+0x5a/0x70
> [ 793.543864] do_init_module+0x1c7/0x582
> [ 793.543877] load_module+0x4efa/0x5f30
> [ 793.543897] ? layout_and_allocate+0x2e10/0x2e10
> [ 793.543909] ? __kasan_check_write+0x14/0x20
> [ 793.543920] ? kernel_read+0xf1/0x140
> [ 793.543931] ? __kasan_check_write+0x14/0x20
> [ 793.543943] ? kernel_read_file+0x244/0x600
> [ 793.543957] ? do_mmap+0x744/0xe40
> [ 793.543968] ? down_write_killable_nested+0x210/0x210
> [ 793.543983] __do_sys_finit_module+0x12a/0x1b0
> [ 793.543994] ? __do_sys_finit_module+0x12a/0x1b0
> [ 793.544006] ? __ia32_sys_init_module+0xa0/0xa0
> [ 793.544018] ? iterate_fd+0x140/0x140
> [ 793.544035] ? vfs_statx_fd+0x45/0x80
> [ 793.544045] ? __kasan_check_write+0x14/0x20
> [ 793.544056] ? fput_many+0x1b/0x130
> [ 793.544073] __x64_sys_finit_module+0x6e/0xb0
> [ 793.544085] do_syscall_64+0xaa/0x380
> [ 793.544097] ? prepare_exit_to_usermode+0xad/0x1b0
> [ 793.544110] entry_SYSCALL_64_after_hwframe+0x44/0xa9
> [ 793.544121] RIP: 0033:0x7f080bb922a9
> [ 793.544132] Code: 00 f3 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d bf 0b 2c 00 f7 d8 64 89 01 48
> [ 793.544167] RSP: 002b:00007ffeab8b0fb8 EFLAGS: 00000246 ORIG_RAX: 0000000000000139
> [ 793.544190] RAX: ffffffffffffffda RBX: 00005584684d5c10 RCX: 00007f080bb922a9
> [ 793.544210] RDX: 0000000000000000 RSI: 00005584682c3548 RDI: 0000000000000003
> [ 793.544230] RBP: 00005584682c3548 R08: 0000000000000000 R09: 00005584684d5400
> [ 793.544251] R10: 0000000000000003 R11: 0000000000000246 R12: 0000000000040000
> [ 793.544272] R13: 00005584684d5dd0 R14: 0000000000000000 R15: 00005584684d5c10
> [ 793.544301] ---[ end trace 89125559482bbf21 ]---
>
>

Thanks for the report, I believe this should be fixed once this series [1] which
collapses all the vimc modules gets merged.

[1] https://patchwork.kernel.org/project/linux-media/list/?series=171283

Regards,
Helen

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