Hi Team, DEADLOCK detected on HiKey (arm64) development board running linux-next-4.12.0-rc1. This DEADLOCK occurred two times while booting the device and other one is while running libhugetlbfs test suite. Error log: ------------ https://pastebin.com/ABmiTfLb LAVA job id: https://validation.linaro.org/scheduler/job/1498548/log_file#L_195_866 Linux kernel version: Linux version 4.12.0-rc1-next-20170515 (buildslave@x86-64-07) (gcc version 6.2.1 20161016 (Linaro GCC 6.2-2016.11) ) #1 SMP PREEMPT Mon May 15 03:12:43 UTC 2017 kernel_repo: https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git kernel_commit_id: ecf5e3d45a01969de14e7feb1126f948fc2a2635 kernel_branch: master build_arch: aarch64 compiler: aarch64-linaro-linux linaro-6.2 Build location: ------------------- https://snapshots.linaro.org/openembedded/lkft/morty/hikey/rpb/linux-next/10 Boot image: - boot-0.0+AUTOINC+06e4def583-4adfdd06f1-r0-hikey-20170515030615-10.uefi.img Rootfs: - rpb-console-image-hikey-20170515030615-10.rootfs.img.gz steps to reproduce: -------------------------- - sudo fastboot flash boot boot-0.0+AUTOINC+06e4def583-4adfdd06f1-r0-hikey-20170515030615-10.uefi.img - sudo fastboot flash system rpb-console-image-hikey-20170515030615-10.rootfs.img - Boot HiKey board. Error log snippet: ----------------------- [ 76.039134] ====================================================== [ 76.045319] WARNING: possible circular locking dependency detected [ 76.051507] 4.12.0-rc1-next-20170515 #1 Not tainted [ 76.056387] ------------------------------------------------------ [ 76.062572] irq/56-wl18xx/2354 is trying to acquire lock: [ 76.067974] (rtnl_mutex){+.+.+.}, at: [<ffff0000089b92f8>] rtnl_lock+0x18/0x20 [ 76.075309] [ 76.075309] but task is already holding lock: [ 76.081145] (&wl->mutex){+.+.+.}, at: [<ffff000000f24054>] wlcore_irq+0xdc/0x1a0 [wlcore] [ 76.089510] [ 76.089510] which lock already depends on the new lock. [ 76.089510] [ 76.097697] [ 76.097697] the existing dependency chain (in reverse order) is: [ 76.105187] [ 76.105187] -> #1 (&wl->mutex){+.+.+.}: [ 76.110519] __lock_acquire+0x17b4/0x1928 [ 76.115053] lock_acquire+0xc8/0x290 [ 76.119155] __mutex_lock+0x78/0x8a8 [ 76.123261] mutex_lock_nested+0x1c/0x28 [ 76.127775] wlcore_regdomain_config.part.25+0x20/0x78 [wlcore] [ 76.134292] wl1271_reg_notify+0x30/0x40 [wlcore] [ 76.139727] wiphy_update_regulatory+0x294/0x420 [cfg80211] [ 76.145975] wiphy_regulatory_register+0x34/0x48 [cfg80211] [ 76.152218] wiphy_register+0x5fc/0x7d8 [cfg80211] [ 76.157812] ieee80211_register_hw+0x3d4/0xa48 [mac80211] [ 76.163811] wlcore_nvs_cb+0x758/0x9a8 [wlcore] [ 76.168936] wlcore_probe+0x98/0xf0 [wlcore] [ 76.173779] wl18xx_probe+0x4c/0xa8 [wl18xx] [ 76.178586] platform_drv_probe+0x58/0xc0 [ 76.183127] driver_probe_device+0x214/0x2d0 [ 76.187926] __driver_attach+0xb4/0xb8 [ 76.192204] bus_for_each_dev+0x64/0xa0 [ 76.196568] driver_attach+0x20/0x28 [ 76.200672] bus_add_driver+0x110/0x230 [ 76.205037] driver_register+0x60/0xf8 [ 76.209315] __platform_driver_register+0x40/0x48 [ 76.214551] 0xffff000000f90018 [ 76.218222] do_one_initcall+0x38/0x120 [ 76.222589] do_init_module+0x5c/0x1c0 [ 76.226868] load_module+0x1cac/0x2428 [ 76.231145] SyS_finit_module+0xc0/0xd0 [ 76.235510] __sys_trace_return+0x0/0x4 [ 76.239872] [ 76.239872] -> #0 (rtnl_mutex){+.+.+.}: [ 76.245215] print_circular_bug+0x80/0x2e0 [ 76.249840] __lock_acquire+0x17dc/0x1928 [ 76.254379] lock_acquire+0xc8/0x290 [ 76.258485] __mutex_lock+0x78/0x8a8 [ 76.262589] mutex_lock_nested+0x1c/0x28 [ 76.267042] rtnl_lock+0x18/0x20 [ 76.270956] cfg80211_sched_scan_results+0x60/0x230 [cfg80211] [ 76.277587] ieee80211_sched_scan_results+0x5c/0x1e0 [mac80211] [ 76.284117] wlcore_scan_sched_scan_results+0x24/0x60 [wlcore] [ 76.290523] wl18xx_process_mailbox_events+0x60/0x468 [wl18xx] [ 76.296955] wl1271_event_handle+0xc4/0x160 [wlcore] [ 76.302514] wlcore_irq_locked+0x4e0/0x660 [wlcore] [ 76.307986] wlcore_irq+0xe4/0x1a0 [wlcore] [ 76.312703] irq_thread_fn+0x28/0x68 [ 76.316809] irq_thread+0x158/0x1f8 [ 76.320827] kthread+0x108/0x138 [ 76.324584] ret_from_fork+0x10/0x40 [ 76.328686] [ 76.328686] other info that might help us debug this: [ 76.328686] [ 76.336715] Possible unsafe locking scenario: [ 76.336715] [ 76.342650] CPU0 CPU1 [ 76.347186] ---- ---- [ 76.351722] lock(&wl->mutex); [ 76.354872] lock(rtnl_mutex); [ 76.360543] lock(&wl->mutex); [ 76.366213] lock(rtnl_mutex); [ 76.369361] [ 76.369361] *** DEADLOCK *** [ 76.369361] [ 76.375304] 1 lock held by irq/56-wl18xx/2354: [ 76.379753] #0: (&wl->mutex){+.+.+.}, at: [<ffff000000f24054>] wlcore_irq+0xdc/0x1a0 [wlcore] [ 76.388547] [ 76.388547] stack backtrace: [ 76.392922] CPU: 4 PID: 2354 Comm: irq/56-wl18xx Not tainted 4.12.0-rc1-next-20170515 #1 [ 76.401032] Hardware name: HiKey Development Board (DT) [ 76.406267] Call trace: [ 76.408720] [<ffff00000808a028>] dump_backtrace+0x0/0x240 [ 76.414131] [<ffff00000808a32c>] show_stack+0x14/0x20 [ 76.419195] [<ffff0000084984f4>] dump_stack+0xbc/0xf8 [ 76.424258] [<ffff000008124504>] print_circular_bug+0x1f4/0x2e0 [ 76.430190] [<ffff00000812757c>] __lock_acquire+0x17dc/0x1928 [ 76.435947] [<ffff000008127f38>] lock_acquire+0xc8/0x290 [ 76.441272] [<ffff000008af5888>] __mutex_lock+0x78/0x8a8 [ 76.446595] [<ffff000008af60d4>] mutex_lock_nested+0x1c/0x28 [ 76.452267] [<ffff0000089b92f8>] rtnl_lock+0x18/0x20 [ 76.457402] [<ffff000000cf4518>] cfg80211_sched_scan_results+0x60/0x230 [cfg80211] [ 76.465253] [<ffff000000dfb0cc>] ieee80211_sched_scan_results+0x5c/0x1e0 [mac80211] [ 76.472994] [<ffff000000f3887c>] wlcore_scan_sched_scan_results+0x24/0x60 [wlcore] [ 76.480624] [<ffff000000f77640>] wl18xx_process_mailbox_events+0x60/0x468 [wl18xx] [ 76.488278] [<ffff000000f2c874>] wl1271_event_handle+0xc4/0x160 [wlcore] [ 76.495056] [<ffff000000f22c28>] wlcore_irq_locked+0x4e0/0x660 [wlcore] [ 76.501747] [<ffff000000f2405c>] wlcore_irq+0xe4/0x1a0 [wlcore] [ 76.507682] [<ffff00000813dab8>] irq_thread_fn+0x28/0x68 [ 76.513005] [<ffff00000813dda0>] irq_thread+0x158/0x1f8 [ 76.518242] [<ffff0000080f4b38>] kthread+0x108/0x138 [ 76.523217] [<ffff000008083710>] ret_from_fork+0x10/0x40 Best regards Naresh Kamboju
