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SubjectBUG: sleeping function called from invalid context in line6_pcm_acquire
From
Hello,

syzbot found the following crash on:

HEAD commit: 43151d6c usb-fuzzer: main usb gadget fuzzer driver
git tree: https://github.com/google/kasan.git usb-fuzzer
console output: https://syzkaller.appspot.com/x/log.txt?x=10f0943ca00000
kernel config: https://syzkaller.appspot.com/x/.config?x=4183eeef650d1234
dashboard link: https://syzkaller.appspot.com/bug?extid=a07d0142e74fdd595cfb
compiler: gcc (GCC) 9.0.0 20181231 (experimental)

Unfortunately, I don't have any reproducer for this crash yet.

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+a07d0142e74fdd595cfb@syzkaller.appspotmail.com

BUG: sleeping function called from invalid context at
kernel/locking/mutex.c:908
in_atomic(): 1, irqs_disabled(): 0, pid: 0, name: swapper/1
1 lock held by swapper/1/0:
#0: 000000004ff5b49f ((&toneport->timer)){+.-.}, at: lockdep_copy_map
include/linux/lockdep.h:170 [inline]
#0: 000000004ff5b49f ((&toneport->timer)){+.-.}, at:
call_timer_fn+0xce/0x5f0 kernel/time/timer.c:1315
CPU: 1 PID: 0 Comm: swapper/1 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:native_safe_halt+0x2/0x10 arch/x86/include/asm/irqflags.h:58
Code: 89 04 24 e8 50 6a a3 f3 48 8b 04 24 e9 d9 fe ff ff 48 89 df e8 3f 6a
a3 f3 eb 8a 90 90 90 90 90 90 90 90 90 90 90 90 90 fb f4 <c3> 0f 1f 00 66
2e 0f 1f 84 00 00 00 00 00 f4 c3 90 90 90 90 90 90
RSP: 0018:ffff8880a84bfdc0 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13
RAX: 0000000000000007 RBX: 0000000000000001 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000006 RDI: ffff8880a84a20bc
RBP: ffffed1015094310 R08: ffff8880a84a1880 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffff8880a84a1880
R13: 0000000000000001 R14: 0000000000000000 R15: ffff8880a84a1880
arch_safe_halt arch/x86/include/asm/paravirt.h:156 [inline]
default_idle+0x24/0x2b0 arch/x86/kernel/process.c:576
cpuidle_idle_call kernel/sched/idle.c:153 [inline]
do_idle+0x321/0x400 kernel/sched/idle.c:262
cpu_startup_entry+0x19/0x20 kernel/sched/idle.c:353
start_secondary+0x30f/0x410 arch/x86/kernel/smpboot.c:267
secondary_startup_64+0xa4/0xb0 arch/x86/kernel/head_64.S:243
==================================================================
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 20 at addr 0000000000000010 by task swapper/1/0

CPU: 1 PID: 0 Comm: swapper/1 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:native_safe_halt+0x2/0x10 arch/x86/include/asm/irqflags.h:58
Code: 89 04 24 e8 50 6a a3 f3 48 8b 04 24 e9 d9 fe ff ff 48 89 df e8 3f 6a
a3 f3 eb 8a 90 90 90 90 90 90 90 90 90 90 90 90 90 fb f4 <c3> 0f 1f 00 66
2e 0f 1f 84 00 00 00 00 00 f4 c3 90 90 90 90 90 90
RSP: 0018:ffff8880a84bfdc0 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13
RAX: 0000000000000007 RBX: 0000000000000001 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000006 RDI: ffff8880a84a20bc
RBP: ffffed1015094310 R08: ffff8880a84a1880 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffff8880a84a1880
R13: 0000000000000001 R14: 0000000000000000 R15: ffff8880a84a1880
arch_safe_halt arch/x86/include/asm/paravirt.h:156 [inline]
default_idle+0x24/0x2b0 arch/x86/kernel/process.c:576
cpuidle_idle_call kernel/sched/idle.c:153 [inline]
do_idle+0x321/0x400 kernel/sched/idle.c:262
cpu_startup_entry+0x19/0x20 kernel/sched/idle.c:353
start_secondary+0x30f/0x410 arch/x86/kernel/smpboot.c:267
secondary_startup_64+0xa4/0xb0 arch/x86/kernel/head_64.S:243
==================================================================


---
This bug is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzkaller@googlegroups.com.

syzbot will keep track of this bug report. See:
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