INFO: task syz-executor.1:20439 blocked for more than 143 seconds.
Not tainted 6.3.0-rc7-syzkaller-00043-gaf67688dca57 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.1 state:D stack:28104 pid:20439 ppid:5114 flags:0x00000004
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5307 [inline]
__schedule+0xc91/0x5770 kernel/sched/core.c:6625
schedule+0xde/0x1a0 kernel/sched/core.c:6701
schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:6760
__mutex_lock_common kernel/locking/mutex.c:679 [inline]
__mutex_lock+0xa3b/0x1350 kernel/locking/mutex.c:747
snd_rawmidi_open+0x26c/0xb70 sound/core/rawmidi.c:474
snd_open+0x223/0x460 sound/core/sound.c:169
chrdev_open+0x26a/0x770 fs/char_dev.c:414
do_dentry_open+0x6cc/0x13f0 fs/open.c:920
do_open fs/namei.c:3560 [inline]
path_openat+0x1baa/0x2750 fs/namei.c:3715
do_filp_open+0x1ba/0x410 fs/namei.c:3742
do_sys_openat2+0x16d/0x4c0 fs/open.c:1348
do_sys_open fs/open.c:1364 [inline]
__do_sys_openat fs/open.c:1380 [inline]
__se_sys_openat fs/open.c:1375 [inline]
__x64_sys_openat+0x143/0x1f0 fs/open.c:1375
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f68d383e2f4
RSP: 002b:00007f68d45d6ca0 EFLAGS: 00000293 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 6666666666666667 RCX: 00007f68d383e2f4
RDX: 0000000000008001 RSI: 00007f68d45d6d40 RDI: 00000000ffffff9c
RBP: 00007f68d45d6d40 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000008001
R13: 00007f68d3acfb1f R14: 00007f68d45d7300 R15: 0000000000022000
</TASK>
Showing all locks held in the system:
1 lock held by rcu_tasks_kthre/12:
#0: ffffffff8c794a70 (rcu_tasks.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x31/0xd80 kernel/rcu/tasks.h:510
1 lock held by rcu_tasks_trace/13:
#0: ffffffff8c794770 (rcu_tasks_trace.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x31/0xd80 kernel/rcu/tasks.h:510
1 lock held by ksoftirqd/1/21:
1 lock held by khungtaskd/28:
#0: ffffffff8c7955c0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x55/0x340 kernel/locking/lockdep.c:6495
2 locks held by kworker/u4:6/2864:
2 locks held by getty/4750:
#0: ffff888027c9b098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x26/0x80 drivers/tty/tty_ldisc.c:244
#1: ffffc900015902f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0xef4/0x13e0 drivers/tty/n_tty.c:2177
1 lock held by syz-executor.1/25853:
#0: ffff888149e75168 (&rmidi->open_mutex){+.+.}-{3:3}, at: rawmidi_release_priv+0x45/0x270 sound/core/rawmidi.c:581
1 lock held by syz-executor.5/2349:
#0: ffff888149e75168 (&rmidi->open_mutex){+.+.}-{3:3}, at: rawmidi_release_priv+0x45/0x270 sound/core/rawmidi.c:581
1 lock held by syz-executor.4/20419:
1 lock held by syz-executor.1/20439:
#0: ffff888149e75168 (&rmidi->open_mutex){+.+.}-{3:3}, at: snd_rawmidi_open+0x26c/0xb70 sound/core/rawmidi.c:474
1 lock held by syz-executor.5/20454:
#0: ffff888149e75168 (&rmidi->open_mutex){+.+.}-{3:3}, at: snd_rawmidi_open+0x26c/0xb70 sound/core/rawmidi.c:474
1 lock held by syz-executor.4/20497:
#0: ffff888149e75168 (&rmidi->open_mutex){+.+.}-{3:3}, at: snd_rawmidi_open+0x26c/0xb70 sound/core/rawmidi.c:474
1 lock held by syz-executor.1/20500:
#0: ffff888149e75168 (&rmidi->open_mutex){+.+.}-{3:3}, at: snd_rawmidi_open+0x26c/0xb70 sound/core/rawmidi.c:474
1 lock held by syz-executor.3/20519:
#0: ffff888149e75168 (&rmidi->open_mutex){+.+.}-{3:3}, at: snd_rawmidi_open+0x26c/0xb70 sound/core/rawmidi.c:474
1 lock held by syz-executor.5/20667:
#0: ffff888149e75168 (&rmidi->open_mutex){+.+.}-{3:3}, at: snd_rawmidi_open+0x26c/0xb70 sound/core/rawmidi.c:474
1 lock held by syz-executor.4/20672:
#0: ffff888149e75168 (&rmidi->open_mutex){+.+.}-{3:3}, at: snd_rawmidi_open+0x26c/0xb70 sound/core/rawmidi.c:474
1 lock held by syz-executor.1/20678:
#0: ffff888149e75168 (&rmidi->open_mutex){+.+.}-{3:3}, at: snd_rawmidi_open+0x26c/0xb70 sound/core/rawmidi.c:474
=============================================
NMI backtrace for cpu 0
CPU: 0 PID: 28 Comm: khungtaskd Not tainted 6.3.0-rc7-syzkaller-00043-gaf67688dca57 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/30/2023
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0xd9/0x150 lib/dump_stack.c:106
nmi_cpu_backtrace+0x29c/0x350 lib/nmi_backtrace.c:113
nmi_trigger_cpumask_backtrace+0x2a4/0x300 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:148 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:222 [inline]
watchdog+0xe16/0x1090 kernel/hung_task.c:379
kthread+0x2e8/0x3a0 kernel/kthread.c:376
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308
</TASK>
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 21 Comm: ksoftirqd/1 Not tainted 6.3.0-rc7-syzkaller-00043-gaf67688dca57 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/30/2023
RIP: 0010:__stack_depot_save+0x111/0x510 lib/stackdepot.c:377
Code: c0 41 89 c0 29 c3 01 f8 41 c1 c0 04 44 31 c3 83 fe 03 77 92 83 fe 02 74 77 83 fe 03 74 6f 83 fe 01 74 70 48 8b 05 b7 2c c7 0d <89> d9 23 0d a7 2c c7 0d 48 8d 0c c8 48 8b 29 48 85 ed 75 12 e9 92
RSP: 0018:ffffc900001b76e0 EFLAGS: 00000286
RAX: ffff88823b400000 RBX: 000000008ed15b41 RCX: 00000000a0e2e0b3
RDX: 0000000000000010 RSI: 0000000000000002 RDI: 00000000fa329327
RBP: ffff88803fb1fdc0 R08: 000000006cfe6ae5 R09: ffffc900001b765c
R10: 0000000000000000 R11: 0000000000094001 R12: 0000000000000001
R13: 0000000000000800 R14: ffffc900001b7750 R15: 0000000000000010
FS: 0000000000000000(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000555556c7c848 CR3: 000000000c571000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 000000000000003b DR6: 00000000ffff0ff0 DR7: 0000000000000400
Call Trace:
<TASK>
kasan_save_stack+0x32/0x40 mm/kasan/common.c:46
kasan_set_track+0x25/0x30 mm/kasan/common.c:52
kasan_save_free_info+0x2e/0x40 mm/kasan/generic.c:521
____kasan_slab_free mm/kasan/common.c:236 [inline]
____kasan_slab_free+0x160/0x1c0 mm/kasan/common.c:200
kasan_slab_free include/linux/kasan.h:162 [inline]
slab_free_hook mm/slub.c:1781 [inline]
slab_free_freelist_hook+0x8b/0x1c0 mm/slub.c:1807
slab_free mm/slub.c:3787 [inline]
kmem_cache_free+0xe9/0x480 mm/slub.c:3809
kfree_skbmem+0xef/0x1b0 net/core/skbuff.c:922
__kfree_skb net/core/skbuff.c:979 [inline]
kfree_skb_reason+0x186/0x3a0 net/core/skbuff.c:1011
kfree_skb include/linux/skbuff.h:1225 [inline]
ip6_mc_input+0xa3c/0xf50 net/ipv6/ip6_input.c:590
dst_input include/net/dst.h:454 [inline]
ip6_rcv_finish net/ipv6/ip6_input.c:79 [inline]
NF_HOOK include/linux/netfilter.h:302 [inline]
NF_HOOK include/linux/netfilter.h:296 [inline]
ipv6_rcv+0x250/0x380 net/ipv6/ip6_input.c:309
__netif_receive_skb_one_core+0x114/0x180 net/core/dev.c:5480
__netif_receive_skb+0x1f/0x1c0 net/core/dev.c:5594
process_backlog+0x239/0x800 net/core/dev.c:5922
__napi_poll+0xb7/0x6f0 net/core/dev.c:6483
napi_poll net/core/dev.c:6550 [inline]
net_rx_action+0x9c2/0xd80 net/core/dev.c:6660
__do_softirq+0x1d4/0x905 kernel/softirq.c:571
run_ksoftirqd kernel/softirq.c:934 [inline]
run_ksoftirqd+0x31/0x60 kernel/softirq.c:926
smpboot_thread_fn+0x659/0x9e0 kernel/smpboot.c:164
kthread+0x2e8/0x3a0 kernel/kthread.c:376
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308
</TASK>