=============================
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
2 locks held by ps/30399:
 #0: 00000000918da39d (rcu_read_lock){....}, at: path_init+0x4f3/0x14b0 fs/namei.c:2176
 #1: 00000000c44ac6dd ((&toneport->timer)){+.-.}, at: lockdep_copy_map include/linux/lockdep.h:170 [inline]
 #1: 00000000c44ac6dd ((&toneport->timer)){+.-.}, at: call_timer_fn+0xce/0x5f0 kernel/time/timer.c:1315

stack backtrace:
CPU: 1 PID: 30399 Comm: ps Not tainted 5.1.0-rc3-319004-g43151d6 #6
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 <IRQ>
 __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
 </IRQ>
RIP: 0010:get_current arch/x86/include/asm/current.h:15 [inline]
RIP: 0010:__sanitizer_cov_trace_pc+0x4/0x50 kernel/kcov.c:173
Code: bc f4 ff ff ff e8 ca 46 e9 ff 48 c7 05 61 7a 4e 15 00 00 00 00 e9 eb eb ff ff 90 90 90 90 90 90 90 90 90 90 90 90 48 8b 34 24 <65> 48 8b 04 25 00 ee 01 00 65 8b 15 0c 23 90 7e 81 e2 00 01 1f 00
RSP: 0018:ffff8880813f7a68 EFLAGS: 00000202 ORIG_RAX: ffffffffffffff13
RAX: 0000000000000000 RBX: 0000000000000041 RCX: ffffffff81b512e5
RDX: 0000000000000001 RSI: ffffffff81b50e2a RDI: 0000000000000001
RBP: ffff8880813f7b18 R08: ffff88808e791880 R09: ffffed1015a25c28
R10: ffffed1015a25c27 R11: ffff8880ad12e13b R12: ffff8880813f7ce0
R13: 0000000000000040 R14: 0000000000000001 R15: ffff88806f242220
 path_init+0xba/0x14b0 fs/namei.c:2179
 path_openat+0x19a/0x40b0 fs/namei.c:3531
 do_filp_open+0x1a6/0x280 fs/namei.c:3563
 do_sys_open+0x3c5/0x590 fs/open.c:1069
 do_syscall_64+0xcf/0x4f0 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x7f056a92f120
Code: 48 8b 15 1b 4d 2b 00 f7 d8 64 89 02 83 c8 ff c3 90 90 90 90 90 90 90 90 90 90 83 3d d5 a4 2b 00 00 75 10 b8 02 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 31 c3 48 83 ec 08 e8 5e 8c 01 00 48 89 04 24
RSP: 002b:00007ffc56bc5a68 EFLAGS: 00000246 ORIG_RAX: 0000000000000002
RAX: ffffffffffffffda RBX: 0000000000616760 RCX: 00007f056a92f120
RDX: 00007ffc56bc5aa1 RSI: 0000000000000000 RDI: 00007ffc56bc5a90
RBP: 0000000000020000 R08: 0000000000000000 R09: 00007f056abf755f
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000638220
R13: 0000000000000020 R14: 00007f056afe4010 R15: 0000000000000000
BUG: sleeping function called from invalid context at kernel/locking/mutex.c:908
in_atomic(): 1, irqs_disabled(): 0, pid: 30399, name: ps
2 locks held by ps/30399:
 #0: 00000000918da39d (rcu_read_lock){....}, at: path_init+0x4f3/0x14b0 fs/namei.c:2176
 #1: 00000000c44ac6dd ((&toneport->timer)){+.-.}, at: lockdep_copy_map include/linux/lockdep.h:170 [inline]
 #1: 00000000c44ac6dd ((&toneport->timer)){+.-.}, at: call_timer_fn+0xce/0x5f0 kernel/time/timer.c:1315
CPU: 1 PID: 30399 Comm: ps Not tainted 5.1.0-rc3-319004-g43151d6 #6
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 <IRQ>
 __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
 </IRQ>
RIP: 0010:get_current arch/x86/include/asm/current.h:15 [inline]
RIP: 0010:__sanitizer_cov_trace_pc+0x4/0x50 kernel/kcov.c:173
Code: bc f4 ff ff ff e8 ca 46 e9 ff 48 c7 05 61 7a 4e 15 00 00 00 00 e9 eb eb ff ff 90 90 90 90 90 90 90 90 90 90 90 90 48 8b 34 24 <65> 48 8b 04 25 00 ee 01 00 65 8b 15 0c 23 90 7e 81 e2 00 01 1f 00
RSP: 0018:ffff8880813f7a68 EFLAGS: 00000202 ORIG_RAX: ffffffffffffff13
RAX: 0000000000000000 RBX: 0000000000000041 RCX: ffffffff81b512e5
RDX: 0000000000000001 RSI: ffffffff81b50e2a RDI: 0000000000000001
RBP: ffff8880813f7b18 R08: ffff88808e791880 R09: ffffed1015a25c28
R10: ffffed1015a25c27 R11: ffff8880ad12e13b R12: ffff8880813f7ce0
R13: 0000000000000040 R14: 0000000000000001 R15: ffff88806f242220
 path_init+0xba/0x14b0 fs/namei.c:2179
 path_openat+0x19a/0x40b0 fs/namei.c:3531
 do_filp_open+0x1a6/0x280 fs/namei.c:3563
 do_sys_open+0x3c5/0x590 fs/open.c:1069
 do_syscall_64+0xcf/0x4f0 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x7f056a92f120
Code: 48 8b 15 1b 4d 2b 00 f7 d8 64 89 02 83 c8 ff c3 90 90 90 90 90 90 90 90 90 90 83 3d d5 a4 2b 00 00 75 10 b8 02 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 31 c3 48 83 ec 08 e8 5e 8c 01 00 48 89 04 24
RSP: 002b:00007ffc56bc5a68 EFLAGS: 00000246 ORIG_RAX: 0000000000000002
RAX: ffffffffffffffda RBX: 0000000000616760 RCX: 00007f056a92f120
RDX: 00007ffc56bc5aa1 RSI: 0000000000000000 RDI: 00007ffc56bc5a90
RBP: 0000000000020000 R08: 0000000000000000 R09: 00007f056abf755f
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000638220
R13: 0000000000000020 R14: 00007f056afe4010 R15: 0000000000000000
==================================================================
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 ps/30399

CPU: 1 PID: 30399 Comm: ps Tainted: G        W         5.1.0-rc3-319004-g43151d6 #6
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 <IRQ>
 __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
 </IRQ>
RIP: 0010:get_current arch/x86/include/asm/current.h:15 [inline]
RIP: 0010:__sanitizer_cov_trace_pc+0x4/0x50 kernel/kcov.c:173
Code: bc f4 ff ff ff e8 ca 46 e9 ff 48 c7 05 61 7a 4e 15 00 00 00 00 e9 eb eb ff ff 90 90 90 90 90 90 90 90 90 90 90 90 48 8b 34 24 <65> 48 8b 04 25 00 ee 01 00 65 8b 15 0c 23 90 7e 81 e2 00 01 1f 00
RSP: 0018:ffff8880813f7a68 EFLAGS: 00000202 ORIG_RAX: ffffffffffffff13
RAX: 0000000000000000 RBX: 0000000000000041 RCX: ffffffff81b512e5
RDX: 0000000000000001 RSI: ffffffff81b50e2a RDI: 0000000000000001
RBP: ffff8880813f7b18 R08: ffff88808e791880 R09: ffffed1015a25c28
R10: ffffed1015a25c27 R11: ffff8880ad12e13b R12: ffff8880813f7ce0
R13: 0000000000000040 R14: 0000000000000001 R15: ffff88806f242220
 path_init+0xba/0x14b0 fs/namei.c:2179
 path_openat+0x19a/0x40b0 fs/namei.c:3531
 do_filp_open+0x1a6/0x280 fs/namei.c:3563
 do_sys_open+0x3c5/0x590 fs/open.c:1069
 do_syscall_64+0xcf/0x4f0 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x7f056a92f120
Code: 48 8b 15 1b 4d 2b 00 f7 d8 64 89 02 83 c8 ff c3 90 90 90 90 90 90 90 90 90 90 83 3d d5 a4 2b 00 00 75 10 b8 02 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 31 c3 48 83 ec 08 e8 5e 8c 01 00 48 89 04 24
RSP: 002b:00007ffc56bc5a68 EFLAGS: 00000246 ORIG_RAX: 0000000000000002
RAX: ffffffffffffffda RBX: 0000000000616760 RCX: 00007f056a92f120
RDX: 00007ffc56bc5aa1 RSI: 0000000000000000 RDI: 00007ffc56bc5a90
RBP: 0000000000020000 R08: 0000000000000000 R09: 00007f056abf755f
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000638220
R13: 0000000000000020 R14: 00007f056afe4010 R15: 0000000000000000
==================================================================