============================= WARNING: suspicious RCU usage 5.1.0-rc3-319004-g43151d6 #6 Not tainted ----------------------------- include/linux/rcupdate.h:267 Illegal context switch in RCU read-side critical section! other info that might help us debug this: rcu_scheduler_active = 2, debug_locks = 1 4 locks held by kworker/u4:4/6033: #0: 000000005d3bb544 ((wq_completion)bat_events){+.+.}, at: __write_once_size include/linux/compiler.h:220 [inline] #0: 000000005d3bb544 ((wq_completion)bat_events){+.+.}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] #0: 000000005d3bb544 ((wq_completion)bat_events){+.+.}, at: atomic64_set include/asm-generic/atomic-instrumented.h:855 [inline] #0: 000000005d3bb544 ((wq_completion)bat_events){+.+.}, at: atomic_long_set include/asm-generic/atomic-long.h:40 [inline] #0: 000000005d3bb544 ((wq_completion)bat_events){+.+.}, at: set_work_data kernel/workqueue.c:619 [inline] #0: 000000005d3bb544 ((wq_completion)bat_events){+.+.}, at: set_work_pool_and_clear_pending kernel/workqueue.c:646 [inline] #0: 000000005d3bb544 ((wq_completion)bat_events){+.+.}, at: process_one_work+0x81f/0x1580 kernel/workqueue.c:2240 #1: 00000000457085e0 ((work_completion)(&(&bat_priv->nc.work)->work)){+.+.}, at: process_one_work+0x853/0x1580 kernel/workqueue.c:2244 #2: 00000000c838b1aa (rcu_read_lock){....}, at: batadv_nc_purge_orig_hash net/batman-adv/network-coding.c:417 [inline] #2: 00000000c838b1aa (rcu_read_lock){....}, at: batadv_nc_worker+0xe5/0x770 net/batman-adv/network-coding.c:730 #3: 000000005515b961 ((&toneport->timer)){+.-.}, at: lockdep_copy_map include/linux/lockdep.h:170 [inline] #3: 000000005515b961 ((&toneport->timer)){+.-.}, at: call_timer_fn+0xce/0x5f0 kernel/time/timer.c:1315 stack backtrace: CPU: 1 PID: 6033 Comm: kworker/u4:4 Not tainted 5.1.0-rc3-319004-g43151d6 #6 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: bat_events batadv_nc_worker Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0xe8/0x16e lib/dump_stack.c:113 rcu_preempt_sleep_check include/linux/rcupdate.h:267 [inline] rcu_preempt_sleep_check include/linux/rcupdate.h:265 [inline] ___might_sleep+0x1b6/0x280 kernel/sched/core.c:6155 __mutex_lock_common kernel/locking/mutex.c:908 [inline] __mutex_lock+0xcd/0x12b0 kernel/locking/mutex.c:1072 line6_pcm_acquire+0x35/0x210 sound/usb/line6/pcm.c:311 call_timer_fn+0x161/0x5f0 kernel/time/timer.c:1325 expire_timers kernel/time/timer.c:1362 [inline] __run_timers kernel/time/timer.c:1681 [inline] __run_timers kernel/time/timer.c:1649 [inline] run_timer_softirq+0x58b/0x1400 kernel/time/timer.c:1694 __do_softirq+0x22a/0x8cd kernel/softirq.c:293 invoke_softirq kernel/softirq.c:374 [inline] irq_exit+0x187/0x1b0 kernel/softirq.c:414 exiting_irq arch/x86/include/asm/apic.h:536 [inline] smp_apic_timer_interrupt+0xfe/0x4a0 arch/x86/kernel/apic/apic.c:1062 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:807 RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:767 [inline] RIP: 0010:lock_acquire+0x15c/0x2f0 kernel/locking/lockdep.c:4214 Code: 0f b6 14 02 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 7e 01 00 00 c7 83 3c 08 00 00 00 00 00 00 48 8b 7c 24 08 57 9d <0f> 1f 44 00 00 48 83 c4 20 5b 5d 41 5c 41 5d 41 5e 41 5f c3 65 8b RSP: 0018:ffff888091887ca0 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 RAX: 0000000000000007 RBX: ffff888091f40000 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffff888091f40890 RDI: 0000000000000246 RBP: ffffffff917d62e0 R08: 000000005a50f5cf R09: 0000000000000028 R10: ffff888091f40890 R11: ffff888091f40000 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000002 R15: ffff88807ea822e8 rcu_lock_acquire include/linux/rcupdate.h:210 [inline] rcu_read_lock include/linux/rcupdate.h:595 [inline] batadv_nc_purge_orig_hash net/batman-adv/network-coding.c:419 [inline] batadv_nc_worker+0x11b/0x770 net/batman-adv/network-coding.c:730 process_one_work+0x90f/0x1580 kernel/workqueue.c:2269 worker_thread+0x9b/0xe20 kernel/workqueue.c:2415 kthread+0x313/0x420 kernel/kthread.c:253 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352 BUG: sleeping function called from invalid context at kernel/locking/mutex.c:908 in_atomic(): 1, irqs_disabled(): 0, pid: 6033, name: kworker/u4:4 4 locks held by kworker/u4:4/6033: #0: 000000005d3bb544 ((wq_completion)bat_events){+.+.}, at: __write_once_size include/linux/compiler.h:220 [inline] #0: 000000005d3bb544 ((wq_completion)bat_events){+.+.}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] #0: 000000005d3bb544 ((wq_completion)bat_events){+.+.}, at: atomic64_set include/asm-generic/atomic-instrumented.h:855 [inline] #0: 000000005d3bb544 ((wq_completion)bat_events){+.+.}, at: atomic_long_set include/asm-generic/atomic-long.h:40 [inline] #0: 000000005d3bb544 ((wq_completion)bat_events){+.+.}, at: set_work_data kernel/workqueue.c:619 [inline] #0: 000000005d3bb544 ((wq_completion)bat_events){+.+.}, at: set_work_pool_and_clear_pending kernel/workqueue.c:646 [inline] #0: 000000005d3bb544 ((wq_completion)bat_events){+.+.}, at: process_one_work+0x81f/0x1580 kernel/workqueue.c:2240 #1: 00000000457085e0 ((work_completion)(&(&bat_priv->nc.work)->work)){+.+.}, at: process_one_work+0x853/0x1580 kernel/workqueue.c:2244 #2: 00000000c838b1aa (rcu_read_lock){....}, at: batadv_nc_purge_orig_hash net/batman-adv/network-coding.c:417 [inline] #2: 00000000c838b1aa (rcu_read_lock){....}, at: batadv_nc_worker+0xe5/0x770 net/batman-adv/network-coding.c:730 #3: 000000005515b961 ((&toneport->timer)){+.-.}, at: lockdep_copy_map include/linux/lockdep.h:170 [inline] #3: 000000005515b961 ((&toneport->timer)){+.-.}, at: call_timer_fn+0xce/0x5f0 kernel/time/timer.c:1315 CPU: 1 PID: 6033 Comm: kworker/u4:4 Not tainted 5.1.0-rc3-319004-g43151d6 #6 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: bat_events batadv_nc_worker Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0xe8/0x16e lib/dump_stack.c:113 ___might_sleep.cold+0x11c/0x136 kernel/sched/core.c:6190 __mutex_lock_common kernel/locking/mutex.c:908 [inline] __mutex_lock+0xcd/0x12b0 kernel/locking/mutex.c:1072 line6_pcm_acquire+0x35/0x210 sound/usb/line6/pcm.c:311 call_timer_fn+0x161/0x5f0 kernel/time/timer.c:1325 expire_timers kernel/time/timer.c:1362 [inline] __run_timers kernel/time/timer.c:1681 [inline] __run_timers kernel/time/timer.c:1649 [inline] run_timer_softirq+0x58b/0x1400 kernel/time/timer.c:1694 __do_softirq+0x22a/0x8cd kernel/softirq.c:293 invoke_softirq kernel/softirq.c:374 [inline] irq_exit+0x187/0x1b0 kernel/softirq.c:414 exiting_irq arch/x86/include/asm/apic.h:536 [inline] smp_apic_timer_interrupt+0xfe/0x4a0 arch/x86/kernel/apic/apic.c:1062 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:807 RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:767 [inline] RIP: 0010:lock_acquire+0x15c/0x2f0 kernel/locking/lockdep.c:4214 Code: 0f b6 14 02 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 7e 01 00 00 c7 83 3c 08 00 00 00 00 00 00 48 8b 7c 24 08 57 9d <0f> 1f 44 00 00 48 83 c4 20 5b 5d 41 5c 41 5d 41 5e 41 5f c3 65 8b RSP: 0018:ffff888091887ca0 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 RAX: 0000000000000007 RBX: ffff888091f40000 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffff888091f40890 RDI: 0000000000000246 RBP: ffffffff917d62e0 R08: 000000005a50f5cf R09: 0000000000000028 R10: ffff888091f40890 R11: ffff888091f40000 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000002 R15: ffff88807ea822e8 rcu_lock_acquire include/linux/rcupdate.h:210 [inline] rcu_read_lock include/linux/rcupdate.h:595 [inline] batadv_nc_purge_orig_hash net/batman-adv/network-coding.c:419 [inline] batadv_nc_worker+0x11b/0x770 net/batman-adv/network-coding.c:730 process_one_work+0x90f/0x1580 kernel/workqueue.c:2269 worker_thread+0x9b/0xe20 kernel/workqueue.c:2415 kthread+0x313/0x420 kernel/kthread.c:253 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352 ================================================================== BUG: KASAN: null-ptr-deref in memset include/linux/string.h:337 [inline] BUG: KASAN: null-ptr-deref in submit_audio_out_urb+0x91e/0x1780 sound/usb/line6/playback.c:246 Write of size 176 at addr 0000000000000010 by task kworker/u4:4/6033 CPU: 1 PID: 6033 Comm: kworker/u4:4 Tainted: G W 5.1.0-rc3-319004-g43151d6 #6 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: bat_events batadv_nc_worker Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0xe8/0x16e lib/dump_stack.c:113 kasan_report.cold+0x5/0x3c mm/kasan/report.c:321 memset+0x20/0x40 mm/kasan/common.c:115 memset include/linux/string.h:337 [inline] submit_audio_out_urb+0x91e/0x1780 sound/usb/line6/playback.c:246 line6_submit_audio_out_all_urbs+0xce/0x120 sound/usb/line6/playback.c:295 line6_stream_start+0x15b/0x1f0 sound/usb/line6/pcm.c:199 line6_pcm_acquire+0x139/0x210 sound/usb/line6/pcm.c:322 call_timer_fn+0x161/0x5f0 kernel/time/timer.c:1325 expire_timers kernel/time/timer.c:1362 [inline] __run_timers kernel/time/timer.c:1681 [inline] __run_timers kernel/time/timer.c:1649 [inline] run_timer_softirq+0x58b/0x1400 kernel/time/timer.c:1694 __do_softirq+0x22a/0x8cd kernel/softirq.c:293 invoke_softirq kernel/softirq.c:374 [inline] irq_exit+0x187/0x1b0 kernel/softirq.c:414 exiting_irq arch/x86/include/asm/apic.h:536 [inline] smp_apic_timer_interrupt+0xfe/0x4a0 arch/x86/kernel/apic/apic.c:1062 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:807 RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:767 [inline] RIP: 0010:lock_acquire+0x15c/0x2f0 kernel/locking/lockdep.c:4214 Code: 0f b6 14 02 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 7e 01 00 00 c7 83 3c 08 00 00 00 00 00 00 48 8b 7c 24 08 57 9d <0f> 1f 44 00 00 48 83 c4 20 5b 5d 41 5c 41 5d 41 5e 41 5f c3 65 8b RSP: 0018:ffff888091887ca0 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 RAX: 0000000000000007 RBX: ffff888091f40000 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffff888091f40890 RDI: 0000000000000246 RBP: ffffffff917d62e0 R08: 000000005a50f5cf R09: 0000000000000028 R10: ffff888091f40890 R11: ffff888091f40000 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000002 R15: ffff88807ea822e8 rcu_lock_acquire include/linux/rcupdate.h:210 [inline] rcu_read_lock include/linux/rcupdate.h:595 [inline] batadv_nc_purge_orig_hash net/batman-adv/network-coding.c:419 [inline] batadv_nc_worker+0x11b/0x770 net/batman-adv/network-coding.c:730 process_one_work+0x90f/0x1580 kernel/workqueue.c:2269 worker_thread+0x9b/0xe20 kernel/workqueue.c:2415 kthread+0x313/0x420 kernel/kthread.c:253 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352 ==================================================================