[....] Starting enhanced syslogd: rsyslogd[ 15.362698] audit: type=1400 audit(1557525634.293:4): avc: denied { syslog } for pid=1920 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 '10.128.0.24' (ECDSA) to the list of known hosts. executing program executing program executing program executing program executing program executing program syzkaller login: [ 44.643953] ------------[ cut here ]------------ [ 44.649135] ------------[ cut here ]------------ [ 44.651344] ------------[ cut here ]------------ [ 44.651362] WARNING: CPU: 1 PID: 2095 at mm/gup.c:388 __get_user_pages+0xae7/0xfd0() [ 44.651469] Kernel panic - not syncing: panic_on_warn set ... [ 44.651469] [ 44.651482] CPU: 1 PID: 2095 Comm: syz-executor471 Not tainted 4.4.174+ #17 [ 44.651495] 0000000000000000 e17aa48ce227ed70 ffff8800b645f818 ffffffff81aad1a1 [ 44.651503] 0000000000000000 ffffffff82835ee0 ffffffff82892ea0 0000000000000184 [ 44.651512] ffffffff8142cb27 ffff8800b645f8f8 ffffffff813a48c2 0000000041b58ab3 [ 44.651514] Call Trace: [ 44.651526] [] dump_stack+0xc1/0x120 [ 44.651534] [] ? __get_user_pages+0xae7/0xfd0 [ 44.651543] [] panic+0x1b9/0x37b [ 44.651551] [] ? add_taint.cold+0x16/0x16 [ 44.651559] [] ? memset+0x32/0x40 [ 44.651568] [] ? warn_slowpath_common.cold+0x5/0x20 [ 44.651576] [] warn_slowpath_common.cold+0x20/0x20 [ 44.651585] [] warn_slowpath_null+0x2a/0x30 [ 44.651592] [] __get_user_pages+0xae7/0xfd0 [ 44.651603] [] ? rt_mutex_futex_unlock+0x10/0x10 [ 44.651610] [] ? follow_page_mask+0x10d0/0x10d0 [ 44.651617] [] get_user_pages+0x6d/0x90 [ 44.651625] [] __access_remote_vm+0x1e3/0x3c0 [ 44.651632] [] ? do_page_mkwrite+0x360/0x360 [ 44.651640] [] ? check_stack_object+0x114/0x160 [ 44.651647] [] access_remote_vm+0x36/0x50 [ 44.651656] [] mem_rw.isra.0+0x178/0x320 [ 44.651663] [] mem_write+0x55/0x70 [ 44.651671] [] __vfs_write+0x116/0x3d0 [ 44.651678] [] ? mem_rw.isra.0+0x320/0x320 [ 44.651685] [] ? __vfs_read+0x3c0/0x3c0 [ 44.651693] [] ? check_preemption_disabled+0x3c/0x200 [ 44.651700] [] ? check_preemption_disabled+0x3c/0x200 [ 44.651710] [] ? rcu_read_lock_sched_held+0x10b/0x130 [ 44.651717] [] ? rcu_sync_lockdep_assert+0x73/0xb0 [ 44.651724] [] ? __sb_start_write+0x14f/0x310 [ 44.651731] [] vfs_write+0x182/0x4e0 [ 44.651738] [] SyS_write+0xdc/0x1c0 [ 44.651745] [] ? SyS_read+0x1c0/0x1c0 [ 44.651755] [] ? do_fast_syscall_32+0xd6/0xa90 [ 44.651762] [] ? SyS_read+0x1c0/0x1c0 [ 44.651770] [] do_fast_syscall_32+0x32d/0xa90 [ 44.651778] [] sysenter_flags_fixed+0xd/0x1a [ 44.654332] Kernel Offset: disabled [ 44.917147] Rebooting in 86400 seconds..