audit: type=1400 audit(1567816965.051:19): avc:  denied  { create } for  pid=5267 comm="syz-executor.4" scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=netlink_generic_socket permissive=1
INFO: task syz-executor.0:5275 blocked for more than 140 seconds.
      Not tainted 4.4.174+ #4
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.0  D ffff8800bb9af868 27408  5275   2106 0x00000004
 ffff8800bb9af868 ffff8800b43f0000 7ea6404b0c8a1dde ffff8800b43f0000
 0000000000000001 ffff8800b43f0800 ffff8801db71f180 ffff8801db71f1a8
 ffff8801db71e898 ffff8801d725af80 ffff8800b43f0000 ffffed0017735001
Call Trace:
 [<ffffffff82709b79>] schedule+0x99/0x1d0 kernel/sched/core.c:3355
 [<ffffffff8270a333>] schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3388
 [<ffffffff8270c492>] __mutex_lock_common kernel/locking/mutex.c:582 [inline]
 [<ffffffff8270c492>] mutex_lock_nested+0x3c2/0xb80 kernel/locking/mutex.c:621
 [<ffffffff81492aa2>] do_truncate2+0x132/0x210 fs/open.c:61
 [<ffffffff814c7766>] handle_truncate fs/namei.c:2816 [inline]
 [<ffffffff814c7766>] do_last fs/namei.c:3286 [inline]
 [<ffffffff814c7766>] path_openat+0x2cf6/0x4470 fs/namei.c:3406
 [<ffffffff814ccab1>] do_filp_open+0x1a1/0x270 fs/namei.c:3440
 [<ffffffff81495668>] do_sys_open+0x2f8/0x600 fs/open.c:1038
 [<ffffffff81495a17>] SYSC_open fs/open.c:1056 [inline]
 [<ffffffff81495a17>] SyS_open fs/open.c:1051 [inline]
 [<ffffffff81495a17>] SYSC_creat fs/open.c:1076 [inline]
 [<ffffffff81495a17>] SyS_creat+0x27/0x30 fs/open.c:1074
 [<ffffffff82718ba1>] entry_SYSCALL_64_fastpath+0x1e/0x9a
2 locks held by syz-executor.0/5275:
 #0:  (sb_writers#4){.+.+.+}, at: [<ffffffff814fcd3f>] sb_start_write include/linux/fs.h:1517 [inline]
 #0:  (sb_writers#4){.+.+.+}, at: [<ffffffff814fcd3f>] mnt_want_write+0x3f/0xb0 fs/namespace.c:391
 #1:  (&sb->s_type->i_mutex_key#9){+.+.+.}, at: [<ffffffff81492aa2>] do_truncate2+0x132/0x210 fs/open.c:61
Sending NMI to all CPUs:
NMI backtrace for cpu 0
CPU: 0 PID: 20 Comm: khungtaskd Not tainted 4.4.174+ #4
task: ffff8801da6f4740 task.stack: ffff8800001d0000
RIP: 0010:[<ffffffff8109b617>]  [<ffffffff8109b617>] _flat_send_IPI_mask arch/x86/kernel/apic/apic_flat_64.c:62 [inline]
RIP: 0010:[<ffffffff8109b617>]  [<ffffffff8109b617>] flat_send_IPI_mask+0xf7/0x1b0 arch/x86/kernel/apic/apic_flat_64.c:69
RSP: 0018:ffff8800001d7c88  EFLAGS: 00000046
RAX: 0000000000000000 RBX: 0000000000000c00 RCX: 0000000000000000
RDX: 0000000000000c00 RSI: 0000000000000000 RDI: ffffffffff5fc300
RBP: ffff8800001d7cb8 R08: 0000000000000018 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000001 R12: 0000000000000246
R13: 0000000003000000 R14: ffffffff82e5f2e0 R15: 0000000000000002
FS:  0000000000000000(0000) GS:ffff8801db600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000001379690 CR3: 00000000b90af000 CR4: 00000000001606b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
 0000000000000001 ffffffff82e5f2e0 ffffffff831a6ac0 fffffbfff0634c34
 000000000001b6c0 0000000000000008 ffff8800001d7cd8 ffffffff81092bee
 0000000000000008 ffffffff82924260 ffff8800001d7d30 ffffffff81ab8252
Call Trace:
 [<ffffffff81092bee>] nmi_raise_cpu_backtrace+0x5e/0x80 arch/x86/kernel/apic/hw_nmi.c:33
 [<ffffffff81ab8252>] nmi_trigger_all_cpu_backtrace.cold+0xa1/0xae lib/nmi_backtrace.c:85
 [<ffffffff81092ca4>] arch_trigger_all_cpu_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:38
 [<ffffffff813b4762>] trigger_all_cpu_backtrace include/linux/nmi.h:44 [inline]
 [<ffffffff813b4762>] check_hung_task kernel/hung_task.c:125 [inline]
 [<ffffffff813b4762>] check_hung_uninterruptible_tasks kernel/hung_task.c:182 [inline]
 [<ffffffff813b4762>] watchdog.cold+0xd3/0xee kernel/hung_task.c:238
 [<ffffffff811342c3>] kthread+0x273/0x310 kernel/kthread.c:211
 [<ffffffff82718fc5>] ret_from_fork+0x55/0x80 arch/x86/entry/entry_64.S:537
Code: 00 c3 5f ff 80 e6 10 75 e1 41 c1 e5 18 44 89 2c 25 10 c3 5f ff 44 89 fa 09 da 80 cf 04 41 83 ff 02 0f 44 d3 89 14 25 00 c3 5f ff <41> f7 c4 00 02 00 00 75 1e 4c 89 e7 57 9d 0f 1f 44 00 00 e8 f1 
NMI backtrace for cpu 1
CPU: 1 PID: 5283 Comm: syz-executor.0 Not tainted 4.4.174+ #4
task: ffff8800b2245f00 task.stack: ffff8801d7c80000
RIP: 0010:[<ffffffff8164af2c>]  [<ffffffff8164af2c>] ext4_map_blocks+0x5c/0x16f0 fs/ext4/inode.c:466
RSP: 0018:ffff8801d7c87c50  EFLAGS: 00000286
RAX: ffffed003af90f95 RBX: ffff8801d7c87e38 RCX: 0000000000000000
RDX: ffff8801d7c87e38 RSI: ffff8801d6ef6988 RDI: 0000000000000000
RBP: ffff8801d7c87d70 R08: 0000000000000002 R09: 0000000000000001
R10: 0000000000000000 R11: 0000000000000000 R12: dffffc0000000000
R13: ffff8801d6ef6988 R14: ffff8801d4299600 R15: 0000000000000000
FS:  00007f8737fb3700(0000) GS:ffff8801db700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fedc0f6f518 CR3: 00000000bac4e000 CR4: 00000000001606b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
 0000000000000246 ffff8800b2245f00 ffff8801d6ef6db8 0000000000000000
 0000000000000000 0000000000000002 0000000000000000 0000000000000246
 1ffff1003af90f95 ffffffff81b0abec 0000000081b0abec 0000000041b58ab3
Call Trace:
 [<ffffffff81634dcb>] ext4_seek_data fs/ext4/file.c:576 [inline]
 [<ffffffff81634dcb>] ext4_llseek+0x68b/0x970 fs/ext4/file.c:717
 [<ffffffff81497af3>] vfs_llseek fs/read_write.c:260 [inline]
 [<ffffffff81497af3>] SYSC_lseek fs/read_write.c:285 [inline]
 [<ffffffff81497af3>] SyS_lseek+0x113/0x180 fs/read_write.c:276
 [<ffffffff82718ba1>] entry_SYSCALL_64_fastpath+0x1e/0x9a
Code: 85 20 ff ff ff 4c 01 e0 48 89 bd 10 ff ff ff 89 8d 34 ff ff ff 48 c7 85 38 ff ff ff b3 8a b5 41 48 c7 85 40 ff ff ff 77 ad c6 82 <48> c7 85 48 ff ff ff d0 ae 64 81 c7 00 f1 f1 f1 f1 c7 40 04 f1