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Date:   Thu, 21 Dec 2017 07:52:01 -0800
From:   syzbot 
        <bot+ad455f7c594ff27631780c162cd6f30dacea78fe@...kaller.appspotmail.com>
To:     linux-kernel@...r.kernel.org, syzkaller-bugs@...glegroups.com,
        tglx@...utronix.de
Subject: BUG: unable to handle kernel NULL pointer dereference in irq_may_run

Hello,

syzkaller hit the following crash on  
6084b576dca2e898f5c101baef151f7bfdbb606d
git://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.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


BUG: unable to handle kernel NULL pointer dereference at           (null)
IP: irqd_has_set kernel/irq/internals.h:230 [inline]
IP: irq_may_run+0x19/0x70 kernel/irq/chip.c:506
PGD 0 P4D 0
Oops: 0000 [#1] SMP
Dumping ftrace buffer:
    (ftrace buffer empty)
Modules linked in:
CPU: 0 PID: 3177 Comm: kworker/u4:2 Not tainted 4.15.0-rc3-next-20171214+  
#67
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS  
Google 01/01/2011
RIP: 0010:irqd_has_set kernel/irq/internals.h:230 [inline]
RIP: 0010:irq_may_run+0x19/0x70 kernel/irq/chip.c:506
RSP: 0018:ffff88021fc03f58 EFLAGS: 00010006
RAX: 0000000000000000 RBX: ffff8802151fa400 RCX: ffffffff81243385
RDX: 0000000000010000 RSI: 0000000000000000 RDI: ffff8802151fa400
RBP: ffff88021fc03f68 R08: 0000000000000001 R09: 000000000000000c
R10: ffff88021fc03ee8 R11: 000000000000000c R12: 0000000000000001
R13: ffff8802151fa400 R14: 0000000000000027 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff88021fc00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 000000000301e003 CR4: 00000000001606f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
  <IRQ>
  handle_edge_irq+0x33/0x220 kernel/irq/chip.c:755
  generic_handle_irq_desc include/linux/irqdesc.h:159 [inline]
  handle_irq+0x15/0x20 arch/x86/kernel/irq_64.c:77
  do_IRQ+0x53/0x100 arch/x86/kernel/irq.c:229
  common_interrupt+0xa9/0xa9 arch/x86/entry/entry_64.S:695
  </IRQ>
RIP: 0010:atomic_add_return arch/x86/include/asm/atomic.h:157 [inline]
RIP: 0010:queued_read_lock include/asm-generic/qrwlock.h:85 [inline]
RIP: 0010:do_raw_read_lock+0x1a/0x50 kernel/locking/spinlock_debug.c:154
RSP: 0018:ffffc900018ebe28 EFLAGS: 00000206 ORIG_RAX: ffffffffffffffd8
RAX: 0000000000000000 RBX: ffffffff830a5100 RCX: 0000000051c3f387
RDX: 0000000000001c96 RSI: 000000004477e779 RDI: ffffffff830a5100
RBP: ffffc900018ebe30 R08: 0000000000000001 R09: 0000000000000001
R10: ffffc900018ebdd0 R11: 0000000000000000 R12: ffff880213744900
R13: 00000000fffffff8 R14: ffffffff830a5100 R15: ffff880213744900
  __raw_read_lock include/linux/rwlock_api_smp.h:150 [inline]
  _raw_read_lock+0x35/0x40 kernel/locking/spinlock.c:216
  search_binary_handler+0xa9/0x2d0 fs/exec.c:1640
  exec_binprm fs/exec.c:1681 [inline]
  do_execveat_common.isra.30+0x861/0xb90 fs/exec.c:1803
  do_execve+0x31/0x40 fs/exec.c:1848
  call_usermodehelper_exec_async+0x104/0x190 kernel/umh.c:100
  ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:524
Code: 07 00 31 c0 5b 5d c3 90 66 2e 0f 1f 84 00 00 00 00 00 55 48 89 e5 41  
54 53 48 89 fb 41 bc 01 00 00 00 e8 bb 6f 07 00 48 8b 43 38 <f7> 00 00 00  
0c 00 75 0d e8 aa 6f 07 00 44 89 e0 5b 41 5c 5d c3
RIP: irqd_has_set kernel/irq/internals.h:230 [inline] RSP: ffff88021fc03f58
RIP: irq_may_run+0x19/0x70 kernel/irq/chip.c:506 RSP: ffff88021fc03f58
CR2: 0000000000000000
---[ end trace 733d3f531bf70369 ]---


---
This bug is generated by a dumb bot. It may contain errors.
See https://goo.gl/tpsmEJ for details.
Direct all questions to syzkaller@...glegroups.com.
Please credit me with: Reported-by: syzbot <syzkaller@...glegroups.com>

syzbot will keep track of this bug report.
Once a fix for this bug is merged into any tree, reply to this email with:
#syz fix: exact-commit-title
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Note: if the crash happens again, it will cause creation of a new bug  
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