INFO: task syz-executor.0:14389 blocked for more than 143 seconds.
Not tainted 5.16.0-rc4-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.0 state:D stack:26864 pid:14389 ppid: 6606 flags:0x00004004
Call Trace:
context_switch kernel/sched/core.c:4972 [inline]
__schedule+0xb72/0x1460 kernel/sched/core.c:6253
schedule+0x12b/0x1f0 kernel/sched/core.c:6326
schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6385
__mutex_lock_common+0xd1f/0x2590 kernel/locking/mutex.c:680
__mutex_lock kernel/locking/mutex.c:740 [inline]
mutex_lock_nested+0x1a/0x20 kernel/locking/mutex.c:792
vhost_net_stop_vq drivers/vhost/net.c:1359 [inline]
vhost_net_stop+0x10c/0x1e0 drivers/vhost/net.c:1373
vhost_net_release+0x100/0x4d0 drivers/vhost/net.c:1405
__fput+0x3fc/0x870 fs/file_table.c:280
task_work_run+0x146/0x1c0 kernel/task_work.c:164
tracehook_notify_resume include/linux/tracehook.h:189 [inline]
exit_to_user_mode_loop kernel/entry/common.c:175 [inline]
exit_to_user_mode_prepare+0x209/0x220 kernel/entry/common.c:207
__syscall_exit_to_user_mode_work kernel/entry/common.c:289 [inline]
syscall_exit_to_user_mode+0x2e/0x70 kernel/entry/common.c:300
do_syscall_64+0x53/0xd0 arch/x86/entry/common.c:86
entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7fbc1071978b
RSP: 002b:00007fffcd8e45b0 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
RAX: 0000000000000000 RBX: 0000000000000001 RCX: 00007fbc1071978b
RDX: 0000000000000000 RSI: 00007fbc104f8ad0 RDI: 0000000000000003
RBP: 0000000000000004 R08: 0000000000000000 R09: 00007fbc1087e6c0
R10: 0000000000000e43 R11: 0000000000000293 R12: 00007fbc1087b860
R13: 00007fbc1087b860 R14: 0000000000000000 R15: 00000000000b6cf9
Showing all locks held in the system:
1 lock held by khungtaskd/26:
#0: ffffffff8cb1dd00 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x0/0x30
2 locks held by getty/3283:
#0: ffff888023f89098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x21/0x70 drivers/tty/tty_ldisc.c:252
#1: ffffc90002b962e8 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x6c5/0x1c60 drivers/tty/n_tty.c:2113
1 lock held by syz-executor.0/14389:
#0: ffff888085670218 (&vq->mutex){+.+.}-{3:3}, at: vhost_net_stop_vq drivers/vhost/net.c:1359 [inline]
#0: ffff888085670218 (&vq->mutex){+.+.}-{3:3}, at: vhost_net_stop+0x10c/0x1e0 drivers/vhost/net.c:1373
1 lock held by vhost-14392/14397:
=============================================
NMI backtrace for cpu 0
CPU: 0 PID: 26 Comm: khungtaskd Not tainted 5.16.0-rc4-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0x1dc/0x2d8 lib/dump_stack.c:106
nmi_cpu_backtrace+0x45f/0x490 lib/nmi_backtrace.c:111
nmi_trigger_cpumask_backtrace+0x16a/0x280 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:210 [inline]
watchdog+0xc82/0xcd0 kernel/hung_task.c:295
kthread+0x468/0x490 kernel/kthread.c:327
ret_from_fork+0x1f/0x30
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 2956 Comm: syslogd Not tainted 5.16.0-rc4-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:memset_erms+0x0/0x10
Code: 89 f9 48 89 d1 83 e2 07 48 c1 e9 03 40 0f b6 f6 48 b8 01 01 01 01 01 01 01 01 48 0f af c6 f3 48 ab 89 d1 f3 aa 4c 89 c8 c3 90 <49> 89 f9 40 88 f0 48 89 d1 f3 aa 4c 89 c8 c3 90 49 89 fa 40 0f b6
RSP: 0018:ffffc90001aaf800 EFLAGS: 00000203
RAX: 0000000000000040 RBX: ffff888077798000 RCX: ffffed100eef3000
RDX: 0000000000000040 RSI: 00000000000000fb RDI: ffffed100eef3000
RBP: 0000000000000400 R08: dffffc0000000000 R09: fffffbfff1ff35f1
R10: fffffbfff1ff35f1 R11: 0000000000000000 R12: 0000000000000000
R13: ffffffff81cfbb71 R14: ffff888011442dc0 R15: 0000000000000001
FS: 00007fc9c1804800(0000) GS:ffff8880b9b00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000564234c99680 CR3: 00000000244d0000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
____kasan_slab_free+0xf7/0x150 mm/kasan/common.c:359
kasan_slab_free include/linux/kasan.h:235 [inline]
slab_free_hook mm/slub.c:1723 [inline]
slab_free_freelist_hook+0x12e/0x1a0 mm/slub.c:1749
slab_free mm/slub.c:3513 [inline]
kfree+0xe1/0x330 mm/slub.c:4561
skb_free_head net/core/skbuff.c:655 [inline]
skb_release_data+0x3c3/0x4f0 net/core/skbuff.c:677
skb_release_all net/core/skbuff.c:742 [inline]
__kfree_skb+0x56/0x1d0 net/core/skbuff.c:756
skb_free_datagram+0x27/0x1e0 net/core/datagram.c:325
__unix_dgram_recvmsg+0xc94/0x1220 net/unix/af_unix.c:2383
sock_recvmsg_nosec net/socket.c:944 [inline]
sock_recvmsg net/socket.c:962 [inline]
sock_read_iter+0x3a7/0x4d0 net/socket.c:1035
call_read_iter include/linux/fs.h:2156 [inline]
new_sync_read fs/read_write.c:400 [inline]
vfs_read+0xaf9/0xe60 fs/read_write.c:481
ksys_read+0x18f/0x2c0 fs/read_write.c:619
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7fc9c19908fe
Code: c0 e9 e6 fe ff ff 50 48 8d 3d 0e c7 09 00 e8 c9 cf 01 00 66 0f 1f 84 00 00 00 00 00 64 8b 04 25 18 00 00 00 85 c0 75 14 0f 05 <48> 3d 00 f0 ff ff 77 5a c3 66 0f 1f 84 00 00 00 00 00 48 83 ec 28
RSP: 002b:00007ffd209eda18 EFLAGS: 00000246 ORIG_RAX: 0000000000000000
RAX: ffffffffffffffda RBX: 0000000000000002 RCX: 00007fc9c19908fe
RDX: 00000000000000ff RSI: 000055904229b950 RDI: 0000000000000000
RBP: 000055904229b910 R08: 00007fc9c1a20040 R09: 00007fc9c1a200c0
R10: 00007fc9c1a1ffc0 R11: 0000000000000246 R12: 000055904229b983
R13: 000055904229b950 R14: 0000000000000000 R15: 0000000000000000
----------------
Code disassembly (best guess):
0: 89 f9 mov %edi,%ecx
2: 48 89 d1 mov %rdx,%rcx
5: 83 e2 07 and $0x7,%edx
8: 48 c1 e9 03 shr $0x3,%rcx
c: 40 0f b6 f6 movzbl %sil,%esi
10: 48 b8 01 01 01 01 01 movabs $0x101010101010101,%rax
17: 01 01 01
1a: 48 0f af c6 imul %rsi,%rax
1e: f3 48 ab rep stos %rax,%es:(%rdi)
21: 89 d1 mov %edx,%ecx
23: f3 aa rep stos %al,%es:(%rdi)
25: 4c 89 c8 mov %r9,%rax
28: c3 retq
29: 90 nop
* 2a: 49 89 f9 mov %rdi,%r9 <-- trapping instruction
2d: 40 88 f0 mov %sil,%al
30: 48 89 d1 mov %rdx,%rcx
33: f3 aa rep stos %al,%es:(%rdi)
35: 4c 89 c8 mov %r9,%rax
38: c3 retq
39: 90 nop
3a: 49 89 fa mov %rdi,%r10
3d: 40 rex
3e: 0f .byte 0xf
3f: b6 .byte 0xb6