Starting mcstransd: 
[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c.
[....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c.
[....] Starting file context maintaining daemon: restorecond[?25l[?1c7[ ok 8[?25h[?0c.
[   30.824856] audit: type=1800 audit(1540620595.400:33): pid=5531 uid=0 auid=4294967295 ses=4294967295 subj=system_u:system_r:kernel_t:s0 op=collect_data cause=failed(directio) comm="startpar" name="rc.local" dev="sda1" ino=2432 res=0
[   30.846569] audit: type=1800 audit(1540620595.400:34): pid=5531 uid=0 auid=4294967295 ses=4294967295 subj=system_u:system_r:kernel_t:s0 op=collect_data cause=failed(directio) comm="startpar" name="rmnologin" dev="sda1" ino=2423 res=0

Debian GNU/Linux 7 syzkaller ttyS0

syzkaller login: [   37.645469] audit: type=1400 audit(1540620602.220:35): avc:  denied  { map } for  pid=5710 comm="bash" path="/bin/bash" dev="sda1" ino=1457 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=system_u:object_r:file_t:s0 tclass=file permissive=1
Warning: Permanently added '10.128.0.38' (ECDSA) to the list of known hosts.
[  102.432151] audit: type=1400 audit(1540620667.010:36): avc:  denied  { map } for  pid=5724 comm="syz-executor781" path="/root/syz-executor781272618" dev="sda1" ino=1426 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:object_r:user_home_t:s0 tclass=file permissive=1
[  102.467772] IPVS: ftp: loaded support on port[0] = 21
executing program
[  102.497205] audit: type=1400 audit(1540620667.070:37): avc:  denied  { associate } for  pid=5725 comm="syz-executor781" name="syz0" scontext=unconfined_u:object_r:unlabeled_t:s0 tcontext=system_u:object_r:unlabeled_t:s0 tclass=filesystem permissive=1
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[  153.852097] 
[  153.853917] =====================================================
[  153.860136] WARNING: SOFTIRQ-safe -> SOFTIRQ-unsafe lock order detected
[  153.866868] 4.19.0+ #84 Not tainted
[  153.870472] -----------------------------------------------------
[  153.876696] syz-executor781/7254 [HC0[0]:SC0[0]:HE0:SE1] is trying to acquire:
[  153.884043] 00000000e70e96f7 (&ctx->fd_wqh){+.+.}, at: aio_poll+0x760/0x1420
[  153.891227] 
[  153.891227] and this task is already holding:
[  153.897224] 000000009957d7d7 (&(&ctx->ctx_lock)->rlock){..-.}, at: aio_poll+0x738/0x1420
[  153.905478] which would create a new lock dependency:
[  153.910647]  (&(&ctx->ctx_lock)->rlock){..-.} -> (&ctx->fd_wqh){+.+.}
[  153.917224] 
[  153.917224] but this new dependency connects a SOFTIRQ-irq-safe lock:
[  153.925272]  (&(&ctx->ctx_lock)->rlock){..-.}
[  153.925279] 
[  153.925279] ... which became SOFTIRQ-irq-safe at:
[  153.936055]   lock_acquire+0x1ed/0x520
[  153.939931]   _raw_spin_lock_irq+0x61/0x80
[  153.944156]   free_ioctx_users+0xbc/0x710
[  153.948296]   percpu_ref_switch_to_atomic_rcu+0x563/0x730
[  153.953818]   rcu_process_callbacks+0x100a/0x1ac0
[  153.958647]   __do_softirq+0x308/0xb7e
[  153.962580]   irq_exit+0x17f/0x1c0
[  153.966113]   smp_apic_timer_interrupt+0x1cb/0x760
[  153.971031]   apic_timer_interrupt+0xf/0x20
[  153.975341]   native_safe_halt+0x6/0x10
[  153.979298]   default_idle+0xbf/0x490
[  153.983082]   arch_cpu_idle+0x10/0x20
[  153.986864]   default_idle_call+0x6d/0x90
[  153.991004]   do_idle+0x49b/0x5c0
[  153.994455]   cpu_startup_entry+0x18/0x20
[  153.998600]   start_secondary+0x487/0x5f0
[  154.002731]   secondary_startup_64+0xa4/0xb0
[  154.007115] 
[  154.007115] to a SOFTIRQ-irq-unsafe lock:
[  154.012717]  (&ctx->fd_wqh){+.+.}
[  154.012724] 
[  154.012724] ... which became SOFTIRQ-irq-unsafe at:
[  154.022624] ...
[  154.022640]   lock_acquire+0x1ed/0x520
[  154.028382]   _raw_spin_lock+0x2d/0x40
[  154.032267]   userfaultfd_ctx_read+0x2e4/0x2180
[  154.037099]   userfaultfd_read+0x1e2/0x2c0
[  154.041325]   __vfs_read+0x117/0x9b0
[  154.045024]   vfs_read+0x17f/0x3c0
[  154.048548]   ksys_read+0x101/0x260
[  154.052160]   __x64_sys_read+0x73/0xb0
[  154.056033]   do_syscall_64+0x1b9/0x820
[  154.059999]   entry_SYSCALL_64_after_hwframe+0x49/0xbe
[  154.065259] 
[  154.065259] other info that might help us debug this:
[  154.065259] 
[  154.073389]  Possible interrupt unsafe locking scenario:
[  154.073389] 
[  154.080304]        CPU0                    CPU1
[  154.084956]        ----                    ----
[  154.089607]   lock(&ctx->fd_wqh);
[  154.093047]                                local_irq_disable();
[  154.099084]                                lock(&(&ctx->ctx_lock)->rlock);
[  154.106080]                                lock(&ctx->fd_wqh);
[  154.112030]   <Interrupt>
[  154.114818]     lock(&(&ctx->ctx_lock)->rlock);
[  154.119474] 
[  154.119474]  *** DEADLOCK ***
[  154.119474] 
[  154.125567] 1 lock held by syz-executor781/7254:
[  154.130312]  #0: 000000009957d7d7 (&(&ctx->ctx_lock)->rlock){..-.}, at: aio_poll+0x738/0x1420
[  154.138977] 
[  154.138977] the dependencies between SOFTIRQ-irq-safe lock and the holding lock:
[  154.147976] -> (&(&ctx->ctx_lock)->rlock){..-.} {
[  154.152805]    IN-SOFTIRQ-W at:
[  154.156076]                     lock_acquire+0x1ed/0x520
[  154.161515]                     _raw_spin_lock_irq+0x61/0x80
[  154.167297]                     free_ioctx_users+0xbc/0x710
[  154.172995]                     percpu_ref_switch_to_atomic_rcu+0x563/0x730
[  154.180084]                     rcu_process_callbacks+0x100a/0x1ac0
[  154.186477]                     __do_softirq+0x308/0xb7e
[  154.191912]                     irq_exit+0x17f/0x1c0
[  154.197003]                     smp_apic_timer_interrupt+0x1cb/0x760
[  154.203493]                     apic_timer_interrupt+0xf/0x20
[  154.209369]                     native_safe_halt+0x6/0x10
[  154.214987]                     default_idle+0xbf/0x490
[  154.220338]                     arch_cpu_idle+0x10/0x20
[  154.225739]                     default_idle_call+0x6d/0x90
[  154.231443]                     do_idle+0x49b/0x5c0
[  154.236457]                     cpu_startup_entry+0x18/0x20
[  154.242154]                     start_secondary+0x487/0x5f0
[  154.247849]                     secondary_startup_64+0xa4/0xb0
[  154.253797]    INITIAL USE at:
[  154.256975]                    lock_acquire+0x1ed/0x520
[  154.262326]                    _raw_spin_lock_irq+0x61/0x80
[  154.268130]                    free_ioctx_users+0xbc/0x710
[  154.273749]                    percpu_ref_switch_to_atomic_rcu+0x563/0x730
[  154.280754]                    rcu_process_callbacks+0x100a/0x1ac0
[  154.287073]                    __do_softirq+0x308/0xb7e
[  154.292490]                    irq_exit+0x17f/0x1c0
[  154.297501]                    smp_apic_timer_interrupt+0x1cb/0x760
[  154.303947]                    apic_timer_interrupt+0xf/0x20
[  154.309743]                    native_safe_halt+0x6/0x10
[  154.315183]                    default_idle+0xbf/0x490
[  154.320450]                    arch_cpu_idle+0x10/0x20
[  154.325724]                    default_idle_call+0x6d/0x90
[  154.331346]                    do_idle+0x49b/0x5c0
[  154.336278]                    cpu_startup_entry+0x18/0x20
[  154.341894]                    start_secondary+0x487/0x5f0
[  154.347510]                    secondary_startup_64+0xa4/0xb0
[  154.353382]  }
[  154.355186]  ... key      at: [<ffffffff8aed9b20>] __key.50623+0x0/0x40
[  154.361921]  ... acquired at:
[  154.365021]    lock_acquire+0x1ed/0x520
[  154.368987]    _raw_spin_lock+0x2d/0x40
[  154.372947]    aio_poll+0x760/0x1420
[  154.376650]    io_submit_one+0xa49/0xf80
[  154.380695]    __x64_sys_io_submit+0x1b7/0x580
[  154.385396]    do_syscall_64+0x1b9/0x820
[  154.389457]    entry_SYSCALL_64_after_hwframe+0x49/0xbe
[  154.394805] 
[  154.396424] 
[  154.396424] the dependencies between the lock to be acquired
[  154.396430]  and SOFTIRQ-irq-unsafe lock:
[  154.407923] -> (&ctx->fd_wqh){+.+.} {
[  154.411720]    HARDIRQ-ON-W at:
[  154.414999]                     lock_acquire+0x1ed/0x520
[  154.420437]                     _raw_spin_lock+0x2d/0x40
[  154.425883]                     userfaultfd_ctx_read+0x2e4/0x2180
[  154.432105]                     userfaultfd_read+0x1e2/0x2c0
[  154.437993]                     __vfs_read+0x117/0x9b0
[  154.443273]                     vfs_read+0x17f/0x3c0
[  154.448424]                     ksys_read+0x101/0x260
[  154.453610]                     __x64_sys_read+0x73/0xb0
[  154.459050]                     do_syscall_64+0x1b9/0x820
[  154.464581]                     entry_SYSCALL_64_after_hwframe+0x49/0xbe
[  154.471403]    SOFTIRQ-ON-W at:
[  154.475027]                     lock_acquire+0x1ed/0x520
[  154.480520]                     _raw_spin_lock+0x2d/0x40
[  154.485957]                     userfaultfd_ctx_read+0x2e4/0x2180
[  154.492226]                     userfaultfd_read+0x1e2/0x2c0
[  154.498025]                     __vfs_read+0x117/0x9b0
[  154.503292]                     vfs_read+0x17f/0x3c0
[  154.508380]                     ksys_read+0x101/0x260
[  154.513555]                     __x64_sys_read+0x73/0xb0
[  154.518993]                     do_syscall_64+0x1b9/0x820
[  154.524520]                     entry_SYSCALL_64_after_hwframe+0x49/0xbe
[  154.531343]    INITIAL USE at:
[  154.534529]                    lock_acquire+0x1ed/0x520
[  154.539928]                    _raw_spin_lock+0x2d/0x40
[  154.545282]                    userfaultfd_ctx_read+0x2e4/0x2180
[  154.551416]                    userfaultfd_read+0x1e2/0x2c0
[  154.557113]                    __vfs_read+0x117/0x9b0
[  154.562351]                    vfs_read+0x17f/0x3c0
[  154.567355]                    ksys_read+0x101/0x260
[  154.572444]                    __x64_sys_read+0x73/0xb0
[  154.577792]                    do_syscall_64+0x1b9/0x820
[  154.583235]                    entry_SYSCALL_64_after_hwframe+0x49/0xbe
[  154.590083]  }
[  154.591878]  ... key      at: [<ffffffff8aed98a0>] __key.44253+0x0/0x40
[  154.598611]  ... acquired at:
[  154.601715]    lock_acquire+0x1ed/0x520
[  154.605681]    _raw_spin_lock+0x2d/0x40
[  154.609710]    aio_poll+0x760/0x1420
[  154.613765]    io_submit_one+0xa49/0xf80
[  154.617814]    __x64_sys_io_submit+0x1b7/0x580
[  154.622384]    do_syscall_64+0x1b9/0x820
[  154.626490]    entry_SYSCALL_64_after_hwframe+0x49/0xbe
[  154.631849] 
[  154.633459] 
[  154.633459] stack backtrace:
[  154.638079] CPU: 0 PID: 7254 Comm: syz-executor781 Not tainted 4.19.0+ #84
[  154.645075] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[  154.654465] Call Trace:
[  154.657058]  dump_stack+0x244/0x39d
[  154.660677]  ? dump_stack_print_info.cold.1+0x20/0x20
[  154.665858]  ? print_shortest_lock_dependencies.cold.55+0x18e/0x211
[  154.672307]  ? vprintk_func+0x85/0x181
[  154.676196]  check_usage.cold.58+0x6d5/0xad1
[  154.680597]  ? check_usage_forwards+0x3d0/0x3d0
[  154.685265]  ? __lock_acquire+0x62f/0x4c20
[  154.689507]  ? lockdep_on+0x50/0x50
[  154.693133]  ? mark_held_locks+0x130/0x130
[  154.697358]  ? __lock_acquire+0x62f/0x4c20
[  154.701577]  ? do_raw_spin_unlock+0xa7/0x330
[  154.705982]  ? trace_event_raw_event_lock_acquire+0x440/0x440
[  154.711865]  __lock_acquire+0x238a/0x4c20
[  154.715999]  ? __lock_acquire+0x238a/0x4c20
[  154.720324]  ? mark_held_locks+0x130/0x130
[  154.724548]  ? zap_class+0x640/0x640
[  154.728260]  ? _raw_spin_unlock_irqrestore+0x82/0xd0
[  154.733403]  ? find_held_lock+0x36/0x1c0
[  154.737464]  ? add_wait_queue+0x1b9/0x2b0
[  154.741602]  ? _raw_spin_unlock_irqrestore+0x82/0xd0
[  154.746708]  ? _raw_spin_unlock_irqrestore+0x82/0xd0
[  154.751813]  ? lockdep_hardirqs_on+0x3bb/0x5b0
[  154.756384]  ? trace_hardirqs_on+0xbd/0x310
[  154.760697]  ? kasan_check_read+0x11/0x20
[  154.764832]  ? add_wait_queue+0x1b9/0x2b0
[  154.768967]  ? trace_hardirqs_off_caller+0x310/0x310
[  154.774186]  ? rcu_softirq_qs+0x20/0x20
[  154.778155]  ? _raw_spin_unlock_irqrestore+0x6d/0xd0
[  154.783255]  ? add_wait_queue+0x1b9/0x2b0
[  154.787401]  ? __wake_up_locked_key_bookmark+0x20/0x20
[  154.792666]  lock_acquire+0x1ed/0x520
[  154.796461]  ? aio_poll+0x760/0x1420
[  154.800259]  ? lock_release+0xa00/0xa00
[  154.804229]  ? kasan_check_read+0x11/0x20
[  154.808374]  ? do_raw_spin_lock+0x14f/0x350
[  154.812683]  ? __ia32_sys_eventfd+0x40/0x40
[  154.816996]  ? rwlock_bug.part.2+0x90/0x90
[  154.821349]  ? trace_hardirqs_on+0x310/0x310
[  154.825747]  ? __save_stack_trace+0x8d/0xf0
[  154.830059]  _raw_spin_lock+0x2d/0x40
[  154.833848]  ? aio_poll+0x760/0x1420
[  154.837599]  aio_poll+0x760/0x1420
[  154.841141]  ? free_ioctx_users+0x710/0x710
[  154.845451]  ? kmem_cache_alloc+0x12e/0x730
[  154.849764]  ? aio_setup_rw+0x170/0x170
[  154.853727]  ? find_held_lock+0x36/0x1c0
[  154.857784]  ? zap_class+0x640/0x640
[  154.861485]  ? zap_class+0x640/0x640
[  154.865196]  ? quarantine_reduce+0x14a/0x1a0
[  154.869597]  ? lock_downgrade+0x900/0x900
[  154.873746]  ? find_held_lock+0x36/0x1c0
[  154.877798]  ? __might_fault+0x12b/0x1e0
[  154.881848]  ? lock_downgrade+0x900/0x900
[  154.885983]  ? lock_release+0xa00/0xa00
[  154.889943]  ? perf_trace_sched_process_exec+0x860/0x860
[  154.895383]  ? kasan_check_read+0x11/0x20
[  154.899520]  ? rcu_dynticks_curr_cpu_in_eqs+0xa2/0x170
[  154.904786]  io_submit_one+0xa49/0xf80
[  154.908659]  ? io_submit_one+0xa49/0xf80
[  154.912713]  ? aio_poll+0x1420/0x1420
[  154.916503]  ? __might_fault+0x12b/0x1e0
[  154.920553]  ? lock_downgrade+0x900/0x900
[  154.924753]  ? perf_trace_sched_process_exec+0x860/0x860
[  154.930201]  __x64_sys_io_submit+0x1b7/0x580
[  154.934596]  ? __ia32_sys_io_destroy+0x580/0x580
[  154.939343]  ? trace_hardirqs_on+0xbd/0x310
[  154.943716]  ? entry_SYSCALL_64_after_hwframe+0x49/0xbe
[  154.949081]  ? trace_hardirqs_off_caller+0x310/0x310
[  154.954168]  ? __sanitizer_cov_trace_const_cmp8+0x18/0x20
[  154.959689]  ? ksys_ioctl+0x81/0xd0
[  154.963301]  do_syscall_64+0x1b9/0x820
[  154.967181]  ? __ia32_sys_io_destroy+0x580/0x580
[  154.971937]  ? do_syscall_64+0x1b9/0x820
[  154.975996]  ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe
[  154.981351]  ? syscall_return_slowpath+0x5e0/0x5e0
[  154.986278]  ? trace_hardirqs_off_thunk+0x1a/0x1c
[  154.991217]  ? trace_hardirqs_on_caller+0x310/0x310
[  154.996227]  ? prepare_exit_to_usermode+0x3b0/0x3b0
[  155.001244]  ? prepare_exit_to_usermode+0x291/0x3b0
[  155.006263]  ? trace_hardirqs_off_thunk+0x1a/0x1c
[  155.011149]  entry_SYSCALL_64_after_hwframe+0x49/0xbe
[  155.016328] RIP: 0033:0x447dc9
[  155.019510] Code: e8 9c ba 02 00 48 83 c4 18 c3 0f 1f 80 00 00 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 5b 07 fc ff c3 66 2e 0f 1f 84 00 00 00 00
[  155.038402] RSP: 002b:00007fc840e69da8 EFLAGS: 00000293 ORIG_RAX: 00000000000000d1
[  155.046102] RAX: ffffffffffffffda RBX: 00000000006e39e8 RCX: 0000000000447dc9
[  155.053372] RDX: 0000000020000b00 RSI: 0000000000000001 RDI: 00007fc840e39000
[  155.060634] RBP: 00000000006e39e0 R08: 0000000000000000 R09: 0000000000000000
[  155.067945] R10: 0000000000000000 R11: 0000000000000293 R12: 00000000006e39ec
[  155.075210] R13: 702f74656e2f666c R14: 65732f636f72702f R15: 0000000000000000
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