NMI watchdog: BUG: soft lockup - CPU#0 stuck for 123s! [syz-executor5:8536]
Modules linked in:
irq event stamp: 928616
hardirqs last  enabled at (928615): [<ffffffff838c3729>] restore_regs_and_iret+0x0/0x1d
hardirqs last disabled at (928616): [<ffffffff838c468b>] apic_timer_interrupt+0x9b/0xb0 arch/x86/entry/entry_64.S:741
softirqs last  enabled at (928614): [<ffffffff838c629f>] __do_softirq+0x4df/0xa1a kernel/softirq.c:299
softirqs last disabled at (928609): [<ffffffff8113f8dd>] invoke_softirq kernel/softirq.c:350 [inline]
softirqs last disabled at (928609): [<ffffffff8113f8dd>] irq_exit+0x10d/0x140 kernel/softirq.c:391
CPU: 0 PID: 8536 Comm: syz-executor5 Not tainted 4.4.141-gb1bad9e #5
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff88009ea3c800 task.stack: ffff8800b8d00000
RIP: 0010:[<ffffffff815b2a47>]  [<ffffffff815b2a47>] do_make_slave fs/pnode.c:84 [inline]
RIP: 0010:[<ffffffff815b2a47>]  [<ffffffff815b2a47>] change_mnt_propagation+0x97/0xb70 fs/pnode.c:130
RSP: 0018:ffff8800b8d07a70  EFLAGS: 00000246
RAX: 0000000000040000 RBX: ffff8800ad8a4600 RCX: ffffc90006c3c000
RDX: 1ffff10039f3f5c4 RSI: ffffffff815b2a36 RDI: ffff8801cf9fae20
RBP: ffff8800b8d07ac8 R08: ffff8800ad8a4668 R09: 0000000000000001
R10: 0000000000000000 R11: ffff88009ea3c800 R12: ffff8801cf9fae00
R13: 0000000000040000 R14: dffffc0000000000 R15: ffff8801cf9faeb0
FS:  0000000000000000(0000) GS:ffff8801db200000(0063) knlGS:00000000f567db40
CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: 00007f04363d8140 CR3: 00000001c9ecb000 CR4: 00000000001606f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
 ffffffff8157e6fd ffff8800ad8a4600 0000000000000000 ffff8800ad8a4620
 ffff8800ad8a46e0 ffffed0015b148c4 ffff8800ad8a4690 dffffc0000000000
 ffff8800ad8a4600 ffff8800abeba160 ffff8800b8d07b68 ffff8800b8d07b90
Call Trace:
 [<ffffffff8157ee16>] umount_tree+0x326/0x810 fs/namespace.c:1501
 [<ffffffff8158720c>] attach_recursive_mnt+0x74c/0x8e0 fs/namespace.c:2035
 [<ffffffff8158750f>] graft_tree+0x16f/0x1f0 fs/namespace.c:2099
 [<ffffffff81589da8>] do_loopback fs/namespace.c:2220 [inline]
 [<ffffffff81589da8>] do_mount+0x20e8/0x2860 fs/namespace.c:2827
 [<ffffffff8162612a>] C_SYSC_mount fs/compat.c:824 [inline]
 [<ffffffff8162612a>] compat_SyS_mount+0x57a/0x1040 fs/compat.c:789
 [<ffffffff81006d96>] do_syscall_32_irqs_on arch/x86/entry/common.c:393 [inline]
 [<ffffffff81006d96>] do_fast_syscall_32+0x326/0x8b0 arch/x86/entry/common.c:460
 [<ffffffff838c446a>] sysenter_flags_fixed+0xd/0x17
Code: 48 8d 43 20 48 89 45 c0 48 c1 e8 03 4c 01 f0 48 89 45 d0 eb 3a e8 da ea d9 ff 49 8d 7c 24 20 48 89 fa 48 c1 ea 03 42 80 3c 32 00 <0f> 85 96 08 00 00 48 8b 45 d0 4d 8b bf 70 ff ff ff 80 38 00 0f 
Sending NMI to other CPUs:
NMI backtrace for cpu 1
CPU: 1 PID: 3759 Comm: cron Not tainted 4.4.141-gb1bad9e #5
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8800b382b000 task.stack: ffff8801c7e90000
RIP: 0010:[<ffffffff81547761>]  [<ffffffff81547761>] rep_nop arch/x86/include/asm/processor.h:561 [inline]
RIP: 0010:[<ffffffff81547761>]  [<ffffffff81547761>] cpu_relax arch/x86/include/asm/processor.h:566 [inline]
RIP: 0010:[<ffffffff81547761>]  [<ffffffff81547761>] __read_seqcount_begin include/linux/seqlock.h:114 [inline]
RIP: 0010:[<ffffffff81547761>]  [<ffffffff81547761>] raw_read_seqcount_begin include/linux/seqlock.h:147 [inline]
RIP: 0010:[<ffffffff81547761>]  [<ffffffff81547761>] read_seqcount_begin include/linux/seqlock.h:164 [inline]
RIP: 0010:[<ffffffff81547761>]  [<ffffffff81547761>] read_seqbegin include/linux/seqlock.h:430 [inline]
RIP: 0010:[<ffffffff81547761>]  [<ffffffff81547761>] path_init+0x1331/0x1910 fs/namei.c:2052
RSP: 0018:ffff8801c7e97af8  EFLAGS: 00000293
RAX: ffff8800b382b000 RBX: ffff8801c7e97c30 RCX: ffffffff844095c0
RDX: 0000000000000000 RSI: ffffffff8154775f RDI: 0000000000000246
RBP: ffff8801c7e97b98 R08: ffffffff853483b0 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: fffffbfff08812b8
R13: ffffffff844095c0 R14: 0000000000000041 R15: ffff8801bb4d441c
FS:  00007f6077fa27a0(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ff767567000 CR3: 00000001cf861000 CR4: 00000000001606f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
 ffffffff8154b98a ffff8800b382b901 0000000000000000 ffff8801c7e97cb8
 0000000000000046 ffff8801c7e97b60 065560bfd0caae2a ffff8800b382b8f8
 ffffffff8538a190 ffff8800b382b8d0 ffff8800b382b8d8 ffff8801c7e97c68
Call Trace:
 [<ffffffff8154b98a>] path_lookupat.isra.36+0x2a/0x410 fs/namei.c:2148
 [<ffffffff815506b7>] filename_lookup.part.53+0x177/0x370 fs/namei.c:2188
 [<ffffffff81550a73>] filename_lookup fs/namei.c:2181 [inline]
 [<ffffffff81550a73>] user_path_at_empty+0x53/0x70 fs/namei.c:2362
 [<ffffffff8152b316>] user_path_at include/linux/namei.h:52 [inline]
 [<ffffffff8152b316>] vfs_fstatat+0xc6/0x170 fs/stat.c:106
 [<ffffffff8152c4b6>] vfs_stat fs/stat.c:123 [inline]
 [<ffffffff8152c4b6>] SYSC_newstat+0x86/0xf0 fs/stat.c:270
 [<ffffffff8152c8bd>] SyS_newstat+0x1d/0x30 fs/stat.c:266
 [<ffffffff838c2b25>] entry_SYSCALL_64_fastpath+0x22/0x9e
Code: ed ff ff e8 b2 21 fb ff e9 ba ed ff ff 48 b8 00 00 00 00 00 fc ff df 49 89 cc 49 89 cd 49 c1 ec 03 49 01 c4 e8 b1 9d e0 ff f3 90 <41> 0f b6 04 24 84 c0 74 08 3c 03 0f 8e 50 04 00 00 41 8b 45 00