Date:   Tue, 07 Nov 2017 06:46:00 -0800
From:   syzbot 
        <bot+28a52b4b1430f7b2e8ced22340031dab2a0e728a@...kaller.appspotmail.com>
To:     akpm@...ux-foundation.org, alexander.deucher@....com,
        chris@...is-wilson.co.uk, davem@...emloft.net,
        gregkh@...uxfoundation.org, horms+renesas@...ge.net.au,
        linux-kernel@...r.kernel.org, mingo@...nel.org, oleg@...hat.com,
        shli@...com, syzkaller-bugs@...glegroups.com, tj@...nel.org
Subject: WARNING in free_kthread_struct

Hello,

syzkaller hit the following crash on  
0f611fb6dcc0d6d91b4e1fec911321f434a3b858
git://git.cmpxchg.org/linux-mmots.git/master
compiler: gcc (GCC) 7.1.1 20170620
.config is attached
Raw console output is attached.
C reproducer is attached
syzkaller reproducer is attached. See https://goo.gl/kgGztJ
for information about syzkaller reproducers


WARNING: CPU: 0 PID: 4918 at kernel/kthread.c:87  
free_kthread_struct+0xa2/0xe0 kernel/kthread.c:87
Kernel panic - not syncing: panic_on_warn set ...

CPU: 0 PID: 4918 Comm: modprobe Not tainted 4.14.0-rc5-mm1+ #20
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS  
Google 01/01/2011
Call Trace:
  <IRQ>
  __dump_stack lib/dump_stack.c:16 [inline]
  dump_stack+0x194/0x257 lib/dump_stack.c:52
  panic+0x1e4/0x41c kernel/panic.c:183
  __warn+0x1c4/0x1e0 kernel/panic.c:546
  report_bug+0x211/0x2d0 lib/bug.c:183
  fixup_bug+0x40/0x90 arch/x86/kernel/traps.c:177
  do_trap_no_signal arch/x86/kernel/traps.c:211 [inline]
  do_trap+0x260/0x390 arch/x86/kernel/traps.c:260
  do_error_trap+0x120/0x390 arch/x86/kernel/traps.c:297
  do_invalid_op+0x1b/0x20 arch/x86/kernel/traps.c:310
  invalid_op+0x18/0x20 arch/x86/entry/entry_64.S:905
RIP: 0010:free_kthread_struct+0xa2/0xe0 kernel/kthread.c:87
RSP: 0000:ffff8801db207768 EFLAGS: 00010206
RAX: ffff8801c431e680 RBX: ffff8801c548f400 RCX: ffffffff8148d7e2
RDX: 0000000000000100 RSI: 0000000000000000 RDI: ffff8801c548f4b8
RBP: ffff8801db207770 R08: 0000000000000001 R09: 1ffff1003b640edc
R10: ffff8801db2076a8 R11: 0000000000000004 R12: 1ffff1003b640ef0
R13: 1ffff1003b640ef4 R14: 0000000000000000 R15: ffff8801db2077e0
  free_task+0x134/0x1a0 kernel/fork.c:390
  __put_task_struct+0x229/0x3b0 kernel/fork.c:668
  put_task_struct include/linux/sched/task.h:95 [inline]
  delayed_put_task_struct+0xca/0x3d0 kernel/exit.c:180
  __rcu_reclaim kernel/rcu/rcu.h:172 [inline]
  rcu_do_batch kernel/rcu/tree.c:2676 [inline]
  invoke_rcu_callbacks kernel/rcu/tree.c:2930 [inline]
  __rcu_process_callbacks kernel/rcu/tree.c:2897 [inline]
  rcu_process_callbacks+0xd74/0x17d0 kernel/rcu/tree.c:2914
  __do_softirq+0x2d7/0xb85 kernel/softirq.c:284
  invoke_softirq kernel/softirq.c:364 [inline]
  irq_exit+0x1cc/0x200 kernel/softirq.c:405
  exiting_irq arch/x86/include/asm/apic.h:540 [inline]
  smp_apic_timer_interrupt+0x16b/0x700 arch/x86/kernel/apic/apic.c:1052
  apic_timer_interrupt+0x9d/0xb0 arch/x86/entry/entry_64.S:770
  </IRQ>
RIP: 0010:__read_once_size include/linux/compiler.h:276 [inline]
RIP: 0010:compound_head include/linux/page-flags.h:146 [inline]
RIP: 0010:PageSwapBacked include/linux/page-flags.h:287 [inline]
RIP: 0010:mm_counter_file include/linux/mm.h:1522 [inline]
RIP: 0010:alloc_set_pte+0x71a/0x1880 mm/memory.c:3420
RSP: 0000:ffff8801c402f3e0 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff11
RAX: dffffc0000000000 RBX: ffff8801c402fb80 RCX: ffffffff81987189
RDX: 1ffff10038805e98 RSI: ffffea00076cb000 RDI: ffffea00076cb020
RBP: ffff8801c402f528 R08: 0000000000000001 R09: 1ffff10038805e0a
R10: ffff8801c402ef88 R11: 0000000000000003 R12: 1ffff10038805e84
R13: 1ffff10038805e98 R14: 0000000000000025 R15: ffffea00076cafe0
  filemap_map_pages+0x1080/0x15d0 mm/filemap.c:2680
  do_fault_around mm/memory.c:3567 [inline]
  do_read_fault mm/memory.c:3601 [inline]
  do_fault mm/memory.c:3706 [inline]
  handle_pte_fault mm/memory.c:3936 [inline]
  __handle_mm_fault+0x1f57/0x39c0 mm/memory.c:4060
  handle_mm_fault+0x334/0x8d0 mm/memory.c:4097
  __do_page_fault+0x5bd/0xd60 arch/x86/mm/fault.c:1438
  do_page_fault+0xee/0x720 arch/x86/mm/fault.c:1514
  page_fault+0x22/0x30 arch/x86/entry/entry_64.S:1066
RIP: 0033:0x7fe25f595390
RSP: 002b:00007ffeb59a5f08 EFLAGS: 00010202
RAX: 0000000000000000 RBX: 00007ffeb59a72a8 RCX: 0000563871b59660
RDX: 00005638719547f0 RSI: 00007ffeb59a72a8 RDI: 0000000000000004
RBP: 00007ffeb59a72a8 R08: 00007ffeb59a5f7c R09: 0000000000000000
R10: 0000000000000000 R11: 00007fe25f595390 R12: 0000000000000004
R13: 0000563871954608 R14: 0000000000000000 R15: 0000000000000000
Dumping ftrace buffer:
    (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..


---
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