1 TITLE: INFO: rcu detected stall in mulaw_decode 2 3 [ 196.114026] INFO: rcu_sched detected stalls on CPUs/tasks: 4 [ 196.119690] (detected by 0, t=125002 jiffies, g=15654, c=15653, q=133) 5 [ 196.126427] All QSes seen, last rcu_sched kthread activity 125002 (4294863411-4294738409), jiffies_till_next_fqs=3, root ->qsmask 0x0 6 [ 196.138535] syz-executor1 R running task 24936 11943 3739 0x0000000c 7 [ 196.145712] Call Trace: 8 [ 196.148271] <IRQ> 9 [ 196.150403] sched_show_task+0x4a3/0x5e0 10 [ 196.154447] ? can_nice.part.83+0x20/0x20 11 [ 196.158577] ? vprintk_func+0x5e/0xc0 12 [ 196.162354] ? printk+0xaa/0xca 13 [ 196.165610] ? show_regs_print_info+0x18/0x18 14 [ 196.170080] ? show_regs_print_info+0x18/0x18 15 [ 196.174578] print_other_cpu_stall+0x996/0x1090 16 [ 196.179228] ? __lock_is_held+0xb6/0x140 17 [ 196.183282] ? rcu_stall_kick_kthreads.part.48+0x770/0x770 18 [ 196.188879] ? check_noncircular+0x20/0x20 19 [ 196.193092] ? print_irqtrace_events+0x270/0x270 20 [ 196.197837] ? print_irqtrace_events+0x270/0x270 21 [ 196.202579] ? debug_check_no_locks_freed+0x3c0/0x3c0 22 [ 196.207744] ? check_noncircular+0x20/0x20 23 [ 196.211962] ? print_irqtrace_events+0x270/0x270 24 [ 196.216697] ? print_irqtrace_events+0x270/0x270 25 [ 196.221440] ? __lock_acquire+0x664/0x3e00 26 [ 196.225662] ? rcu_read_lock_sched_held+0x108/0x120 27 [ 196.230657] ? update_cfs_rq_load_avg.part.69+0x23d/0x2d0 28 [ 196.236196] check_cpu_stall.isra.61+0x6e6/0x15b0 29 [ 196.241015] ? check_noncircular+0x20/0x20 30 [ 196.245241] ? rcu_lockdep_current_cpu_online+0x190/0x190 31 [ 196.250756] ? debug_check_no_locks_freed+0x3c0/0x3c0 32 [ 196.255942] ? find_held_lock+0x35/0x1d0 33 [ 196.259996] ? check_noncircular+0x20/0x20 34 [ 196.264213] ? lock_downgrade+0x980/0x980 35 [ 196.268340] ? debug_check_no_locks_freed+0x3c0/0x3c0 36 [ 196.273513] ? lock_release+0xa40/0xa40 37 [ 196.277475] ? check_noncircular+0x20/0x20 38 [ 196.281699] ? check_noncircular+0x20/0x20 39 [ 196.285922] ? cpuacct_account_field+0x1e4/0x3b0 40 [ 196.290662] ? check_noncircular+0x20/0x20 41 [ 196.294870] ? find_held_lock+0x35/0x1d0 42 [ 196.298911] ? __acct_update_integrals+0x339/0x4d0 43 [ 196.303825] ? __lock_is_held+0xb6/0x140 44 [ 196.307884] rcu_check_callbacks+0x256/0xd00 45 [ 196.312279] ? rcu_cpu_stall_reset+0x260/0x260 46 [ 196.316843] ? trace_hardirqs_off+0xd/0x10 47 [ 196.321054] ? raise_softirq+0x325/0x490 48 [ 196.325095] ? raise_softirq_irqoff+0x320/0x320 49 [ 196.329745] ? read_boot_clock64+0x70/0x70 50 [ 196.333961] ? lock_downgrade+0x980/0x980 51 [ 196.338085] ? lock_downgrade+0x980/0x980 52 [ 196.342218] ? run_local_timers+0x18d/0x200 53 [ 196.346515] ? timer_clear_idle+0x50/0x50 54 [ 196.350644] ? account_process_tick+0xd4/0x3e0 55 [ 196.355210] ? thread_group_cputime+0xef0/0xef0 56 [ 196.359859] ? ktime_get_resolution_ns+0x300/0x300 57 [ 196.364779] update_process_times+0x30/0x60 58 [ 196.369080] tick_sched_handle+0x85/0x160 59 [ 196.373206] tick_sched_timer+0x42/0x120 60 [ 196.377249] __hrtimer_run_queues+0x358/0xe20 61 [ 196.381733] ? tick_sched_do_timer+0xe0/0xe0 62 [ 196.386122] ? hrtimer_fixup_init+0x70/0x70 63 [ 196.390435] ? pvclock_read_flags+0x160/0x160 64 [ 196.394924] ? kvm_clock_get_cycles+0x25/0x30 65 [ 196.399397] ? ktime_get_update_offsets_now+0x34a/0x520 66 [ 196.404747] ? do_timer+0x50/0x50 67 [ 196.408179] ? native_apic_msr_write+0x5c/0x80 68 [ 196.412739] ? do_raw_spin_trylock+0x190/0x190 69 [ 196.417301] ? lapic_next_event+0x54/0x80 70 [ 196.421436] ? clockevents_program_event+0x108/0x2e0 71 [ 196.426526] hrtimer_interrupt+0x1c2/0x5e0 72 [ 196.430767] smp_apic_timer_interrupt+0x14a/0x700 73 [ 196.435592] ? smp_call_function_single_interrupt+0x640/0x640 74 [ 196.441455] ? _raw_spin_lock+0x32/0x40 75 [ 196.445410] ? _raw_spin_unlock+0x22/0x30 76 [ 196.449533] ? handle_edge_irq+0x2b4/0x7c0 77 [ 196.453747] ? task_prio+0x40/0x40 78 [ 196.457279] ? trace_hardirqs_off_thunk+0x1a/0x1c 79 [ 196.462113] apic_timer_interrupt+0xa9/0xb0 80 [ 196.466405] </IRQ> 81 [ 196.468619] RIP: 0010:check_memory_region+0x38/0x190 82 [ 196.473693] RSP: 0000:ffff8801bd2ff868 EFLAGS: 00000212 ORIG_RAX: ffffffffffffff11 83 [ 196.481384] RAX: ffff7fffffffffff RBX: ffffc9000160020b RCX: ffffffff841fceaf 84 [ 196.488632] RDX: 0000000000000001 RSI: 0000000000000002 RDI: ffffc9000160020a 85 [ 196.495875] RBP: ffff8801bd2ff878 R08: ffffc9000160020a R09: dffffc0000000000 86 [ 196.503120] R10: 0000000000000001 R11: ffffed0037a5ff2e R12: ffffc9000160020a 87 [ 196.510365] R13: ffff8801bd2ff970 R14: dffffc0000000000 R15: ffffc9000160020a 88 [ 196.517632] ? mulaw_decode+0x52f/0x770 89 [ 196.521592] ? check_noncircular+0x20/0x20 90 [ 196.525806] memcpy+0x37/0x50 91 [ 196.528895] mulaw_decode+0x52f/0x770 92 [ 196.532706] ? snd_pcm_plugin_build_linear+0x8a0/0x8a0 93 [ 196.537960] ? snd_pcm_plugin_client_channels+0x17/0x80 94 [ 196.543305] ? io_src_channels+0x10a/0x210 95 [ 196.547525] mulaw_transfer+0x222/0x270 96 [ 196.551473] ? lock_release+0xa40/0xa40 97 [ 196.555431] ? mulaw_encode+0x7c0/0x7c0 98 [ 196.559384] snd_pcm_plug_write_transfer+0x22d/0x420 99 [ 196.564475] ? snd_pcm_plug_client_channels_buf+0x3f0/0x3f0 100 [ 196.570164] ? snd_pcm_format_physical_width+0x5b/0x70 101 [ 196.575419] ? snd_pcm_plug_client_channels_buf+0x1db/0x3f0 102 [ 196.581116] snd_pcm_oss_write2+0x260/0x420 103 [ 196.585425] ? snd_pcm_oss_write3+0x1b0/0x1b0 104 [ 196.589913] snd_pcm_oss_write+0x5fe/0x830 105 [ 196.594157] ? snd_pcm_oss_ioctl_compat+0x30/0x30 106 [ 196.598991] ? snd_pcm_oss_ioctl_compat+0x30/0x30 107 [ 196.603813] __vfs_write+0xef/0x970 108 [ 196.607418] ? rcu_note_context_switch+0x710/0x710 109 [ 196.612327] ? kernel_read+0x120/0x120 110 [ 196.616193] ? __might_sleep+0x95/0x190 111 [ 196.620146] ? _cond_resched+0x14/0x30 112 [ 196.624010] ? __inode_security_revalidate+0xd9/0x130 113 [ 196.629180] ? avc_policy_seqno+0x9/0x20 114 [ 196.633218] ? selinux_file_permission+0x82/0x460 115 [ 196.638045] ? security_file_permission+0x89/0x1e0 116 [ 196.642956] ? rw_verify_area+0xe5/0x2b0 117 [ 196.646991] ? __fdget_raw+0x20/0x20 118 [ 196.650693] vfs_write+0x189/0x510 119 [ 196.654218] SyS_write+0xef/0x220 120 [ 196.657656] ? SyS_read+0x220/0x220 121 [ 196.661258] ? trace_hardirqs_on_caller+0x421/0x5c0 122 [ 196.666256] ? trace_hardirqs_on_thunk+0x1a/0x1c 123 [ 196.670999] entry_SYSCALL_64_fastpath+0x23/0x9a 124 [ 196.675728] RIP: 0033:0x452ac9 125 [ 196.678895] RSP: 002b:00007fa354a13c58 EFLAGS: 00000212 ORIG_RAX: 0000000000000001 126 [ 196.686582] RAX: ffffffffffffffda RBX: cccccccccccccccd RCX: 0000000000452ac9 127 [ 196.693825] RDX: 00000000fffffeb2 RSI: 0000000020083fc6 RDI: 0000000000000014 128 [ 196.701069] RBP: 00000000000005b5 R08: 0000000000000000 R09: 0000000000000000 129 [ 196.708322] R10: 0000000000000000 R11: 0000000000000212 R12: 00000000006f6998 130 [ 196.715566] R13: 00000000ffffffff R14: 00007fa354a146d4 R15: 0000000000000000 131
