INFO: task syz.8.1227:12381 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.8.1227      state:D stack:28936 pid:12381 tgid:12362 ppid:10710  task_flags:0x400040 flags:0x00004004
Call Trace:
 <TASK>
 __schedule+0x1798/0x4cc0
 schedule+0x165/0x360
 schedule_preempt_disabled+0x13/0x30
 rwsem_down_write_slowpath+0x872/0xfe0
 down_write+0x1ab/0x1f0
 vfs_setxattr+0x144/0x2f0
 filename_setxattr+0x274/0x600
 path_setxattrat+0x364/0x3a0
 __x64_sys_lsetxattr+0xbf/0xe0
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f31e458ec29
RSP: 002b:00007f31e53f3038 EFLAGS: 00000246 ORIG_RAX: 00000000000000bd
RAX: ffffffffffffffda RBX: 00007f31e47d6090 RCX: 00007f31e458ec29
RDX: 00002000000001c0 RSI: 0000200000000180 RDI: 00002000000001c0
RBP: 00007f31e4611e41 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000361 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f31e47d6128 R14: 00007f31e47d6090 R15: 00007ffea0ce5818
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/34:
 #0: ffffffff8e13a0e0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180
2 locks held by getty/5680:
 #0: ffff888023b7f0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70
 #1: ffffc900029062f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x43e/0x1400
4 locks held by kworker/u8:6/8314:
 #0: ffff88801b2f7148 ((wq_completion)netns){+.+.}-{0:0}, at: process_scheduled_works+0x9b4/0x17b0
 #1: ffffc90002f3fbc0 (net_cleanup_work){+.+.}-{0:0}, at: process_scheduled_works+0x9ef/0x17b0
 #2: ffffffff8f52d310 (pernet_ops_rwsem){++++}-{4:4}, at: cleanup_net+0xf7/0x800
 #3: ffffffff8f53a1c8 (rtnl_mutex){+.+.}-{4:4}, at: wg_destruct+0x25/0x2f0
3 locks held by kworker/0:0/10696:
2 locks held by kworker/u9:19/11713:
4 locks held by syz.8.1227/12363:
 #0: ffff8881220fe428 (sb_writers#29){.+.+}-{0:0}, at: mnt_want_write+0x41/0x90
 #1: ffff888123901330 (&sb->s_type->i_mutex_key#39){++++}-{4:4}, at: vfs_setxattr+0x144/0x2f0
 #2: ffff8881220fe618 (sb_internal#3){.+.+}-{0:0}, at: xfs_trans_alloc+0xd7/0x980
 #3: ffff888123901118 (&xfs_nondir_ilock_class){++++}-{4:4}, at: xfs_trans_alloc_inode+0x161/0x4a0
2 locks held by syz.8.1227/12381:
 #0: ffff8881220fe428 (sb_writers#29){.+.+}-{0:0}, at: mnt_want_write+0x41/0x90
 #1: ffff888123901330 (&sb->s_type->i_mutex_key#39){++++}-{4:4}, at: vfs_setxattr+0x144/0x2f0
3 locks held by syz-executor/14643:
 #0: 
ffffffff8eca9720 (&ops->srcu#2){.+.+}-{0:0}, at: rtnl_link_ops_get+0x23/0x250
 #1: ffffffff8f53a1c8 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_newlink+0x8db/0x1c70
 #2: ffffffff8e13fb78 (rcu_state.exp_mutex){+.+.}-{4:4}, at: synchronize_rcu_expedited+0x2f6/0x730
2 locks held by syz.3.1674/14711:

=============================================

NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 34 Comm: khungtaskd Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
Call Trace:
 <TASK>
 dump_stack_lvl+0x189/0x250
 nmi_cpu_backtrace+0x39e/0x3d0
 nmi_trigger_cpumask_backtrace+0x17a/0x300
 watchdog+0xf93/0xfe0
 kthread+0x711/0x8a0
 ret_from_fork+0x439/0x7d0
 ret_from_fork_asm+0x1a/0x30
 </TASK>
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 14643 Comm: syz-executor Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
RIP: 0010:native_apic_msr_write+0x39/0x50
Code: 74 2a 83 ff 30 74 25 eb 10 81 ff d0 00 00 00 74 1b 81 ff e0 00 00 00 74 13 c1 ef 04 81 c7 00 08 00 00 89 f9 89 f0 31 d2 0f 30 <66> 90 c3 cc cc cc cc cc f3 0f 1e fa 89 f6 31 d2 e9 52 17 8f 03 66
RSP: 0018:ffffc90000007e50 EFLAGS: 00000046
RAX: 0000000000089f4b RBX: ffff88804b023900 RCX: 0000000000000838
RDX: 0000000000000000 RSI: 0000000000089f4b RDI: 0000000000000838
RBP: 0000000000000000 R08: 0000000000000000 R09: ffffffff81ae036e
R10: 0000000000000003 R11: ffffffff81703490 R12: 0000000010008ced
R13: dffffc0000000000 R14: 0000000000089f4b R15: 0000000000000020
FS:  000055558dfc9500(0000) GS:ffff8880b8613000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fbeb81ff000 CR3: 000000002a9c4000 CR4: 00000000000006f0
Call Trace:
 <IRQ>
 lapic_next_event+0x11/0x20
 clockevents_program_event+0x1cf/0x360
 hrtimer_interrupt+0x620/0xaa0
 __sysvec_apic_timer_interrupt+0x10b/0x410
 sysvec_apic_timer_interrupt+0xa1/0xc0
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:vprintk_emit+0x58f/0x7a0
Code: 85 32 01 00 00 e8 51 86 1f 00 41 89 df 4d 85 f6 48 8b 1c 24 75 07 e8 40 86 1f 00 eb 06 e8 39 86 1f 00 fb 48 c7 c7 80 e3 12 8e <31> f6 ba 01 00 00 00 31 c9 41 b8 01 00 00 00 45 31 c9 53 e8 b9 35
RSP: 0018:ffffc9000390e8e0 EFLAGS: 00000293
RAX: ffffffff81a02757 RBX: ffffffff81a02614 RCX: ffff88810ac81cc0
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff8e12e380
RBP: ffffc9000390e9f0 R08: ffffffff8fa3a737 R09: 1ffffffff1f474e6
R10: dffffc0000000000 R11: fffffbfff1f474e7 R12: dffffc0000000000
R13: 1ffff92000721d20 R14: 0000000000000200 R15: 0000000000000028
 _printk+0xcf/0x120
 netdev_info+0x10a/0x160
 __dev_set_promiscuity+0x307/0x740
 netif_set_promiscuity+0x50/0xe0
 dev_set_promiscuity+0x126/0x260
 br_manage_promisc+0x180/0x560
 br_add_if+0x642/0xec0
 do_set_master+0x533/0x6d0
 do_setlink+0xcf0/0x41c0
 rtnl_newlink+0x160b/0x1c70
 rtnetlink_rcv_msg+0x7cf/0xb70
 netlink_rcv_skb+0x208/0x470
 netlink_unicast+0x82f/0x9e0
 netlink_sendmsg+0x805/0xb30
 __sock_sendmsg+0x21c/0x270
 __sys_sendto+0x3bd/0x520
 __x64_sys_sendto+0xde/0x100
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fe30ed90abc
Code: 2a 5f 02 00 44 8b 4c 24 2c 4c 8b 44 24 20 89 c5 44 8b 54 24 28 48 8b 54 24 18 b8 2c 00 00 00 48 8b 74 24 10 8b 7c 24 08 0f 05 <48> 3d 00 f0 ff ff 77 34 89 ef 48 89 44 24 08 e8 70 5f 02 00 48 8b
RSP: 002b:00007ffc4901ca50 EFLAGS: 00000293 ORIG_RAX: 000000000000002c
RAX: ffffffffffffffda RBX: 00007fe30fb04620 RCX: 00007fe30ed90abc
RDX: 0000000000000028 RSI: 00007fe30fb04670 RDI: 0000000000000003
RBP: 0000000000000000 R08: 00007ffc4901caa4 R09: 000000000000000c
R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000003
R13: 0000000000000000 R14: 00007fe30fb04670 R15: 0000000000000000
 </TASK>
