syzbot

random: sshd: uninitialized urandom read (32 bytes read)
audit: type=1400 audit(1555876647.059:36): avc:  denied  { map } for  pid=7038 comm="syz-executor830" path="/root/syz-executor830216529" 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
INFO: task syz-executor830:7059 blocked for more than 140 seconds.
      Not tainted 4.14.113 #3
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor830 D28528  7059   7038 0x00000004
Call Trace:
 context_switch kernel/sched/core.c:2807 [inline]
 __schedule+0x7be/0x1cf0 kernel/sched/core.c:3383
 schedule+0x92/0x1c0 kernel/sched/core.c:3427
 schedule_timeout+0x93d/0xe10 kernel/time/timer.c:1721
 do_wait_for_common kernel/sched/completion.c:91 [inline]
 __wait_for_common kernel/sched/completion.c:112 [inline]
 wait_for_common kernel/sched/completion.c:123 [inline]
 wait_for_completion+0x27c/0x420 kernel/sched/completion.c:144
 af_alg_wait_for_completion crypto/af_alg.c:493 [inline]
 af_alg_wait_for_completion+0x38/0xb0 crypto/af_alg.c:488
 _aead_recvmsg crypto/algif_aead.c:314 [inline]
 aead_recvmsg+0x83a/0x1da0 crypto/algif_aead.c:335
 sock_recvmsg_nosec net/socket.c:819 [inline]
 sock_recvmsg net/socket.c:826 [inline]
 sock_recvmsg+0xc8/0x110 net/socket.c:822
 sock_read_iter+0x22f/0x340 net/socket.c:903
 call_read_iter include/linux/fs.h:1768 [inline]
 do_iter_readv_writev+0x4f7/0x680 fs/read_write.c:672
 do_iter_read+0x221/0x5b0 fs/read_write.c:916
 vfs_readv+0xd3/0x130 fs/read_write.c:980
 do_readv+0xc2/0x220 fs/read_write.c:1013
 SYSC_readv fs/read_write.c:1100 [inline]
 SyS_readv+0x28/0x30 fs/read_write.c:1097
 do_syscall_64+0x1eb/0x630 arch/x86/entry/common.c:289
 entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x441349
RSP: 002b:00007fff2352d3c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000013
RAX: ffffffffffffffda RBX: 00000000004a23d8 RCX: 0000000000441349
RDX: 0000000000000001 RSI: 00000000200007c0 RDI: 0000000000000004
RBP: 000000000006c788 R08: 00000000004002c8 R09: 00000000004002c8
R10: 00000000004002c8 R11: 0000000000000246 R12: 0000000000402170
R13: 0000000000402200 R14: 0000000000000000 R15: 0000000000000000

Showing all locks held in the system:
1 lock held by khungtaskd/1007:
 #0:  (tasklist_lock){.+.+}, at: [<ffffffff81486f98>] debug_show_all_locks+0x7f/0x21f kernel/locking/lockdep.c:4544
2 locks held by getty/7013:
 #0:  (&tty->ldisc_sem){++++}, at: [<ffffffff861b0323>] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:377
 #1:  (&ldata->atomic_read_lock){+.+.}, at: [<ffffffff8310c666>] n_tty_read+0x1e6/0x17b0 drivers/tty/n_tty.c:2156
2 locks held by getty/7014:
 #0:  (&tty->ldisc_sem){++++}, at: [<ffffffff861b0323>] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:377
 #1:  (&ldata->atomic_read_lock){+.+.}, at: [<ffffffff8310c666>] n_tty_read+0x1e6/0x17b0 drivers/tty/n_tty.c:2156
2 locks held by getty/7015:
 #0:  (&tty->ldisc_sem){++++}, at: [<ffffffff861b0323>] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:377
 #1:  (&ldata->atomic_read_lock){+.+.}, at: [<ffffffff8310c666>] n_tty_read+0x1e6/0x17b0 drivers/tty/n_tty.c:2156
2 locks held by getty/7016:
 #0:  (&tty->ldisc_sem){++++}, at: [<ffffffff861b0323>] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:377
 #1:  (&ldata->atomic_read_lock){+.+.}, at: [<ffffffff8310c666>] n_tty_read+0x1e6/0x17b0 drivers/tty/n_tty.c:2156
2 locks held by getty/7017:
 #0:  (&tty->ldisc_sem){++++}, at: [<ffffffff861b0323>] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:377
 #1:  (&ldata->atomic_read_lock){+.+.}, at: [<ffffffff8310c666>] n_tty_read+0x1e6/0x17b0 drivers/tty/n_tty.c:2156
2 locks held by getty/7018:
 #0:  (&tty->ldisc_sem){++++}, at: [<ffffffff861b0323>] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:377
 #1:  (&ldata->atomic_read_lock){+.+.}, at: [<ffffffff8310c666>] n_tty_read+0x1e6/0x17b0 drivers/tty/n_tty.c:2156
2 locks held by getty/7019:
 #0:  (&tty->ldisc_sem){++++}, at: [<ffffffff861b0323>] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:377
 #1:  (&ldata->atomic_read_lock){+.+.}, at: [<ffffffff8310c666>] n_tty_read+0x1e6/0x17b0 drivers/tty/n_tty.c:2156
1 lock held by syz-executor830/7059:
 #0:  (sk_lock-AF_ALG){+.+.}, at: [<ffffffff82c0d0df>] lock_sock include/net/sock.h:1462 [inline]
 #0:  (sk_lock-AF_ALG){+.+.}, at: [<ffffffff82c0d0df>] af_alg_wait_for_data+0x1df/0x480 crypto/af_alg.c:800

=============================================

NMI backtrace for cpu 1
CPU: 1 PID: 1007 Comm: khungtaskd Not tainted 4.14.113 #3
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0x138/0x19c lib/dump_stack.c:53
 nmi_cpu_backtrace.cold+0x57/0x94 lib/nmi_backtrace.c:101
 nmi_trigger_cpumask_backtrace+0x141/0x189 lib/nmi_backtrace.c:62
 arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:38
 trigger_all_cpu_backtrace include/linux/nmi.h:140 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:195 [inline]
 watchdog+0x5e7/0xb90 kernel/hung_task.c:274
 kthread+0x31c/0x430 kernel/kthread.c:232
 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:402
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0 skipped: idling at pc 0xffffffff861b0e02