[....] Starting enhanced syslogd: rsyslogd[ 12.933408] audit: type=1400 audit(1520235852.120:4): avc: denied { syslog } for pid=3646 comm="rsyslogd" capability=34 scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=capability2 permissive=1
[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c.
[....] Starting periodic command scheduler: cron[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c.
Starting mcstransd:
[....] Starting file context maintaining daemon: restorecond[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c.
[....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c.
Debian GNU/Linux 7 syzkaller ttyS0
Warning: Permanently added '10.128.0.20' (ECDSA) to the list of known hosts.
2018/03/05 07:44:25 parsed 1 programs
2018/03/05 07:44:25 executed programs: 0
syzkaller login: [ 26.809974] IPVS: Creating netns size=2536 id=1
[ 26.829185]
[ 26.830833] ======================================================
[ 26.837165] [ INFO: possible circular locking dependency detected ]
[ 26.843541] 4.9.86-gb324a70 #58 Not tainted
[ 26.847839] -------------------------------------------------------
[ 26.854213] syz-executor0/3815 is trying to acquire lock:
[ 26.859717] (&mm->mmap_sem){++++++}, at: [<ffffffff814c26d4>] __might_fault+0xe4/0x1d0
[ 26.868191] but task is already holding lock:
[ 26.872832] (ashmem_mutex){+.+.+.}, at: [<ffffffff82d4b121>] ashmem_ioctl+0x371/0xfe0
[ 26.881272] which lock already depends on the new lock.
[ 26.881272]
[ 26.888257]
[ 26.888257] the existing dependency chain (in reverse order) is:
[ 26.895847]
-> #1 (ashmem_mutex){+.+.+.}:
[ 26.900626] lock_acquire+0x12e/0x410
[ 26.904923] mutex_lock_nested+0xbb/0x870
[ 26.909573] ashmem_mmap+0x53/0x400
[ 26.913693] mmap_region+0x7dd/0xfd0
[ 26.917896] do_mmap+0x57b/0xbe0
[ 26.921758] vm_mmap_pgoff+0x16b/0x1b0
[ 26.926142] SyS_mmap_pgoff+0x33f/0x560
[ 26.930621] do_fast_syscall_32+0x2f5/0x870
[ 26.935436] entry_SYSENTER_compat+0x90/0xa2
[ 26.940339]
-> #0 (&mm->mmap_sem){++++++}:
[ 26.945195] __lock_acquire+0x2bf9/0x3640
[ 26.949833] lock_acquire+0x12e/0x410
[ 26.954126] __might_fault+0x14a/0x1d0
[ 26.958506] ashmem_ioctl+0x3c0/0xfe0
[ 26.962797] compat_ashmem_ioctl+0x3e/0x50
[ 26.967523] compat_SyS_ioctl+0x15f/0x2050
[ 26.972251] do_fast_syscall_32+0x2f5/0x870
[ 26.977063] entry_SYSENTER_compat+0x90/0xa2
[ 26.981958]
[ 26.981958] other info that might help us debug this:
[ 26.981958]
[ 26.990069] Possible unsafe locking scenario:
[ 26.990069]
[ 26.996095] CPU0 CPU1
[ 27.000741] ---- ----
[ 27.005379] lock(ashmem_mutex);
[ 27.009047] lock(&mm->mmap_sem);
[ 27.015307] lock(ashmem_mutex);
[ 27.021491] lock(&mm->mmap_sem);
[ 27.025240]
[ 27.025240] *** DEADLOCK ***
[ 27.025240]
[ 27.031275] 1 lock held by syz-executor0/3815:
[ 27.035824] #0: (ashmem_mutex){+.+.+.}, at: [<ffffffff82d4b121>] ashmem_ioctl+0x371/0xfe0
[ 27.044777]
[ 27.044777] stack backtrace:
[ 27.049245] CPU: 0 PID: 3815 Comm: syz-executor0 Not tainted 4.9.86-gb324a70 #58
[ 27.056748] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[ 27.066076] ffff8801d7e97a38 ffffffff81d956f9 ffffffff853a4cd0 ffffffff853a4cd0
[ 27.074069] ffffffff853c57f0 ffff8801d89950d8 ffff8801d8994800 ffff8801d7e97a80
[ 27.082050] ffffffff812387f1 ffff8801d89950d8 00000000d89950b0 ffff8801d89950d8
[ 27.090026] Call Trace:
[ 27.092590] [<ffffffff81d956f9>] dump_stack+0xc1/0x128
[ 27.097929] [<ffffffff812387f1>] print_circular_bug+0x271/0x310
[ 27.104046] [<ffffffff8123ec29>] __lock_acquire+0x2bf9/0x3640
[ 27.109993] [<ffffffff81bdad0c>] ? avc_has_extended_perms+0x3fc/0xf10
[ 27.116630] [<ffffffff81bda9f2>] ? avc_has_extended_perms+0xe2/0xf10
[ 27.123182] [<ffffffff8123c030>] ? debug_check_no_locks_freed+0x2c0/0x2c0
[ 27.130166] [<ffffffff8123b41f>] ? mark_held_locks+0xaf/0x100
[ 27.136112] [<ffffffff838abd83>] ? mutex_lock_nested+0x5e3/0x870
[ 27.142331] [<ffffffff81234d01>] ? __lock_is_held+0xa1/0xf0
[ 27.148099] [<ffffffff812400ae>] lock_acquire+0x12e/0x410
[ 27.153699] [<ffffffff814c26d4>] ? __might_fault+0xe4/0x1d0
[ 27.159472] [<ffffffff814c273a>] __might_fault+0x14a/0x1d0
[ 27.165167] [<ffffffff814c26d4>] ? __might_fault+0xe4/0x1d0
[ 27.170936] [<ffffffff82d4b170>] ashmem_ioctl+0x3c0/0xfe0
[ 27.176534] [<ffffffff81beb275>] ? selinux_file_ioctl+0x355/0x530
[ 27.182823] [<ffffffff81beaf20>] ? selinux_capable+0x40/0x40
[ 27.188680] [<ffffffff82d4adb0>] ? get_name+0x250/0x250
[ 27.194104] [<ffffffff812e5fd9>] ? compat_SyS_futex+0x1f9/0x2a0
[ 27.200231] [<ffffffff82d4bdce>] compat_ashmem_ioctl+0x3e/0x50
[ 27.206263] [<ffffffff8167d38f>] compat_SyS_ioctl+0x15f/0x