[....] Starting enhanced syslogd: rsyslogd[ 12.438894] audit: type=1400 audit(1547043490.696:4): avc: denied { syslog } for pid=1910 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[ ok 8[?25h[?0c. [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. Starting mcstransd: [....] Starting file context maintaining daemon: restorecond[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.0.109' (ECDSA) to the list of known hosts. executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program syzkaller login: [ 33.350501] kasan: CONFIG_KASAN_INLINE enabled [ 33.362366] kasan: GPF could be caused by NULL-ptr deref or user memory accessgeneral protection fault: 0000 [#1] PREEMPT SMP KASAN [ 33.388124] Modules linked in: [ 33.391465] CPU: 0 PID: 3380 Comm: syz-executor520 Not tainted 4.4.169+ #2 executing program [ 33.398461] task: ffff8800b4f0c740 task.stack: ffff8801d1c80000 [ 33.404527] RIP: 0010:[] [] ebitmap_destroy+0x32/0xe0 [ 33.413053] RSP: 0018:ffff8801d1c87658 EFLAGS: 00010202 [ 33.418489] RAX: dffffc0000000000 RBX: 1ffff1003a390ed7 RCX: ffff8800b4f0d008 [ 33.425761] RDX: 0000000000000001 RSI: ffffffff8197dce1 RDI: 0000000000000008 [ 33.425765] RBP: ffff8801d1c87678 R08: 0000000000000003 R09: ffff8800b4f0d078 [ 33.425768] R10: 0000000000000000 R11: 0000000000000000 R12: ffff8801d27aff60 [ 33.425772] R13: 0000000000000008 R14: 00000000ffffffea R15: ffff8801d1c87718 [ 33.425777] FS: 00007f2db97e0700(0000) GS:ffff8801db600000(0000) knlGS:0000000000000000 [ 33.425781] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 33.425785] CR2: 00007efcf032c000 CR3: 00000000b4c3b000 CR4: 00000000001606b0 [ 33.425792] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 33.425795] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 33.425797] Stack: [ 33.425805] 1ffff1003a390ed7 ffff8801d27aff60 0000000000000000 00000000ffffffea [ 33.425813] ffff8801d1c87698 ffffffff81986a69 ffff8801d1c87a40 ffff8801d27aff60 [ 33.425820] ffff8801d1c87740 ffffffff8198732d ffff8801d2634ab0 0000000000000004 [ 33.425822] Call Trace: [ 33.425831] [] sens_destroy+0x49/0xa0 [ 33.425837] [] sens_read+0x1dd/0x360 [ 33.425843] [] ? cat_read+0x340/0x340 [ 33.425850] [] policydb_read+0xc3b/0x2280 [ 33.425875] [] ? mark_held_locks+0xb1/0x100 [ 33.425883] [] ? get_page_from_freelist+0x9d8/0x1d00 [ 33.425890] [] ? cat_read+0x340/0x340 [ 33.425896] [] ? string_to_av_perm+0x90/0x90 [ 33.425904] [] ? security_load_policy+0x103/0x9c0 [ 33.425913] [] ? check_preemption_disabled+0x3c/0x200 [ 33.425921] [] ? check_preemption_disabled+0x3c/0x200 [ 33.425928] [] ? kasan_kmalloc+0xb7/0xd0 [ 33.425935] [] ? kmem_cache_alloc_trace+0x123/0x2d0 [ 33.425942] [] security_load_policy+0x23c/0x9c0 [ 33.425949] [] ? native_set_pgd+0x50/0x50 [ 33.425956] [] ? security_get_bools+0x610/0x610 [ 33.425963] [] ? vmap_page_range_noflush+0x517/0x780 [ 33.425970] [] ? alloc_vmap_area.isra.0+0x810/0x810 [ 33.425979] [] ? debug_lockdep_rcu_enabled+0x71/0xa0 [ 33.425989] [] ? check_stack_object+0x114/0x160 [ 33.425995] [] ? __check_object_size+0x222/0x332 [ 33.426000] [] sel_write_load+0x175/0xf90 [ 33.426006] [] ? sel_read_bool+0x240/0x240 [ 33.426012] [] ? trace_hardirqs_on+0x10/0x10 [ 33.426019] [] __vfs_write+0x116/0x3d0 [ 33.426024] [] ? sel_read_bool+0x240/0x240 [ 33.426030] [] ? __vfs_read+0x3c0/0x3c0 [ 33.426037] [] ? check_preemption_disabled+0x3c/0x200 [ 33.426044] [] ? check_preemption_disabled+0x3c/0x200 [ 33.426050] [] ? rcu_read_lock_sched_held+0x10b/0x130 [ 33.426057] [] ? rcu_sync_lockdep_assert+0x73/0xb0 [ 33.426063] [] ? __sb_start_write+0x14f/0x310 [ 33.426069] [] vfs_write+0x182/0x4e0 [ 33.426075] [] SyS_write+0xdc/0x1c0 [ 33.426081] [] ? SyS_read+0x1c0/0x1c0 [ 33.426089] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 33.426097] [] entry_SYSCALL_64_fastpath+0x1e/0x9a [ 33.426188] Code: 55 49 89 fd 41 54 53 e8 2d b7 98 ff 4d 85 ed 0f 84 92 00 00 00 e8 1f b7 98 ff 4c 89 ea 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 <80> 3c 02 00 0f 85 91 00 00 00 49 be 00 00 00 00 00 fc ff df 4d [ 33.426196] RIP [] ebitmap_destroy+0x32/0xe0 [ 33.426198] RSP [ 33.430028] ---[ end trace 325e214f888ddfa3 ]--- [ 33.430032] Kernel panic - not syncing: Fatal exception [ 33.433705] Kernel Offset: disabled [ 33.787209] Rebooting in 86400 seconds..