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SubjectWARNING: suspicious RCU usage 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/tree/usb-fuzzer
console output: https://syzkaller.appspot.com/x/log.txt?x=11b5f9d4a00000
kernel config: https://syzkaller.appspot.com/x/.config?x=4183eeef650d1234
dashboard link: https://syzkaller.appspot.com/bug?extid=06b7a5a8c4acc0445995
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+06b7a5a8c4acc0445995@syzkaller.appspotmail.com

=============================
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 syz-executor.4/5712:
#0: 0000000034ec6c83 (rcu_read_lock){....}, at: arch_static_branch
arch/x86/include/asm/jump_label.h:23 [inline]
#0: 0000000034ec6c83 (rcu_read_lock){....}, at: mem_cgroup_disabled
include/linux/memcontrol.h:333 [inline]
#0: 0000000034ec6c83 (rcu_read_lock){....}, at:
get_mem_cgroup_from_mm+0x66/0x570 mm/memcontrol.c:838
#1: 000000004e680701 ((&toneport->timer)){+.-.}, at: lockdep_copy_map
include/linux/lockdep.h:170 [inline]
#1: 000000004e680701 ((&toneport->timer)){+.-.}, at:
call_timer_fn+0xce/0x5f0 kernel/time/timer.c:1315

stack backtrace:
CPU: 0 PID: 5712 Comm: syz-executor.4 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:arch_local_irq_restore arch/x86/include/asm/paravirt.h:767
[inline]
RIP: 0010:lock_is_held_type+0x1df/0x250 kernel/locking/lockdep.c:4251
Code: 48 c1 ea 03 0f b6 14 02 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 04 84 d2
75 6d 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 18 44 89 e8 5b 5d 41 5c 41 5d 41 5e 41 5f
RSP: 0018:ffff888074387a60 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13
RAX: 0000000000000007 RBX: ffff88808c00e200 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff917d62e0 RDI: 0000000000000246
RBP: ffff88808c00e200 R08: 00000000d2d39b7b R09: ffffed1015a05c28
R10: ffffed1015a05c27 R11: ffff8880ad02e13b R12: ffff88808c00ea38
R13: 0000000000000001 R14: ffff88808c00ea40 R15: ffffffff917d62e0
get_mem_cgroup_from_mm mm/memcontrol.c:851 [inline]
get_mem_cgroup_from_mm+0x3b6/0x570 mm/memcontrol.c:834
get_mem_cgroup_from_current mm/memcontrol.c:897 [inline]
memcg_kmem_get_cache+0x142/0x5d0 mm/memcontrol.c:2548
slab_pre_alloc_hook mm/slab.h:425 [inline]
slab_alloc_node mm/slub.c:2682 [inline]
slab_alloc mm/slub.c:2764 [inline]
kmem_cache_alloc+0x12f/0x270 mm/slub.c:2769
copy_sighand kernel/fork.c:1468 [inline]
copy_process.part.0+0x1e84/0x76b0 kernel/fork.c:1910
copy_process kernel/fork.c:1709 [inline]
_do_fork+0x234/0xed0 kernel/fork.c:2226
do_syscall_64+0xcf/0x4f0 arch/x86/entry/common.c:290
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x45736a
Code: f7 d8 64 89 04 25 d4 02 00 00 64 4c 8b 0c 25 10 00 00 00 31 d2 4d 8d
91 d0 02 00 00 31 f6 bf 11 00 20 01 b8 38 00 00 00 0f 05 <48> 3d 00 f0 ff
ff 0f 87 f5 00 00 00 85 c0 41 89 c5 0f 85 fc 00 00
RSP: 002b:00007fff80f37540 EFLAGS: 00000246 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 00007fff80f37540 RCX: 000000000045736a
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000001200011
RBP: 00007fff80f37580 R08: 0000000000000001 R09: 0000000000a57940
R10: 0000000000a57c10 R11: 0000000000000246 R12: 0000000000000001
R13: 0000000000000000 R14: 0000000000000000 R15: 00007fff80f375d0
BUG: sleeping function called from invalid context at
kernel/locking/mutex.c:908
in_atomic(): 1, irqs_disabled(): 0, pid: 5712, name: syz-executor.4
2 locks held by syz-executor.4/5712:
#0: 0000000034ec6c83 (rcu_read_lock){....}, at: arch_static_branch
arch/x86/include/asm/jump_label.h:23 [inline]
#0: 0000000034ec6c83 (rcu_read_lock){....}, at: mem_cgroup_disabled
include/linux/memcontrol.h:333 [inline]
#0: 0000000034ec6c83 (rcu_read_lock){....}, at:
get_mem_cgroup_from_mm+0x66/0x570 mm/memcontrol.c:838
#1: 000000004e680701 ((&toneport->timer)){+.-.}, at: lockdep_copy_map
include/linux/lockdep.h:170 [inline]
#1: 000000004e680701 ((&toneport->timer)){+.-.}, at:
call_timer_fn+0xce/0x5f0 kernel/time/timer.c:1315
CPU: 0 PID: 5712 Comm: syz-executor.4 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:arch_local_irq_restore arch/x86/include/asm/paravirt.h:767
[inline]
RIP: 0010:lock_is_held_type+0x1df/0x250 kernel/locking/lockdep.c:4251
Code: 48 c1 ea 03 0f b6 14 02 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 04 84 d2
75 6d 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 18 44 89 e8 5b 5d 41 5c 41 5d 41 5e 41 5f
RSP: 0018:ffff888074387a60 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13
RAX: 0000000000000007 RBX: ffff88808c00e200 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff917d62e0 RDI: 0000000000000246
RBP: ffff88808c00e200 R08: 00000000d2d39b7b R09: ffffed1015a05c28
R10: ffffed1015a05c27 R11: ffff8880ad02e13b R12: ffff88808c00ea38
R13: 0000000000000001 R14: ffff88808c00ea40 R15: ffffffff917d62e0
get_mem_cgroup_from_mm mm/memcontrol.c:851 [inline]
get_mem_cgroup_from_mm+0x3b6/0x570 mm/memcontrol.c:834
get_mem_cgroup_from_current mm/memcontrol.c:897 [inline]
memcg_kmem_get_cache+0x142/0x5d0 mm/memcontrol.c:2548
slab_pre_alloc_hook mm/slab.h:425 [inline]
slab_alloc_node mm/slub.c:2682 [inline]
slab_alloc mm/slub.c:2764 [inline]
kmem_cache_alloc+0x12f/0x270 mm/slub.c:2769
copy_sighand kernel/fork.c:1468 [inline]
copy_process.part.0+0x1e84/0x76b0 kernel/fork.c:1910
copy_process kernel/fork.c:1709 [inline]
_do_fork+0x234/0xed0 kernel/fork.c:2226
do_syscall_64+0xcf/0x4f0 arch/x86/entry/common.c:290
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x45736a
Code: f7 d8 64 89 04 25 d4 02 00 00 64 4c 8b 0c 25 10 00 00 00 31 d2 4d 8d
91 d0 02 00 00 31 f6 bf 11 00 20 01 b8 38 00 00 00 0f 05 <48> 3d 00 f0 ff
ff 0f 87 f5 00 00 00 85 c0 41 89 c5 0f 85 fc 00 00
RSP: 002b:00007fff80f37540 EFLAGS: 00000246 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 00007fff80f37540 RCX: 000000000045736a
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000001200011
RBP: 00007fff80f37580 R08: 0000000000000001 R09: 0000000000a57940
R10: 0000000000a57c10 R11: 0000000000000246 R12: 0000000000000001
R13: 0000000000000000 R14: 0000000000000000 R15: 00007fff80f375d0
==================================================================
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 syz-executor.4/5712

CPU: 0 PID: 5712 Comm: syz-executor.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
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:arch_local_irq_restore arch/x86/include/asm/paravirt.h:767
[inline]
RIP: 0010:lock_is_held_type+0x1df/0x250 kernel/locking/lockdep.c:4251
Code: 48 c1 ea 03 0f b6 14 02 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 04 84 d2
75 6d 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 18 44 89 e8 5b 5d 41 5c 41 5d 41 5e 41 5f
RSP: 0018:ffff888074387a60 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13
RAX: 0000000000000007 RBX: ffff88808c00e200 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff917d62e0 RDI: 0000000000000246
RBP: ffff88808c00e200 R08: 00000000d2d39b7b R09: ffffed1015a05c28
R10: ffffed1015a05c27 R11: ffff8880ad02e13b R12: ffff88808c00ea38
R13: 0000000000000001 R14: ffff88808c00ea40 R15: ffffffff917d62e0
get_mem_cgroup_from_mm mm/memcontrol.c:851 [inline]
get_mem_cgroup_from_mm+0x3b6/0x570 mm/memcontrol.c:834
get_mem_cgroup_from_current mm/memcontrol.c:897 [inline]
memcg_kmem_get_cache+0x142/0x5d0 mm/memcontrol.c:2548
slab_pre_alloc_hook mm/slab.h:425 [inline]
slab_alloc_node mm/slub.c:2682 [inline]
slab_alloc mm/slub.c:2764 [inline]
kmem_cache_alloc+0x12f/0x270 mm/slub.c:2769
copy_sighand kernel/fork.c:1468 [inline]
copy_process.part.0+0x1e84/0x76b0 kernel/fork.c:1910
copy_process kernel/fork.c:1709 [inline]
_do_fork+0x234/0xed0 kernel/fork.c:2226
do_syscall_64+0xcf/0x4f0 arch/x86/entry/common.c:290
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x45736a
Code: f7 d8 64 89 04 25 d4 02 00 00 64 4c 8b 0c 25 10 00 00 00 31 d2 4d 8d
91 d0 02 00 00 31 f6 bf 11 00 20 01 b8 38 00 00 00 0f 05 <48> 3d 00 f0 ff
ff 0f 87 f5 00 00 00 85 c0 41 89 c5 0f 85 fc 00 00
RSP: 002b:00007fff80f37540 EFLAGS: 00000246 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 00007fff80f37540 RCX: 000000000045736a
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000001200011
RBP: 00007fff80f37580 R08: 0000000000000001 R09: 0000000000a57940
R10: 0000000000a57c10 R11: 0000000000000246 R12: 0000000000000001
R13: 0000000000000000 R14: 0000000000000000 R15: 00007fff80f375d0
==================================================================


---
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:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.

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