[....] Starting enhanced syslogd: rsyslogd[ 16.342302] audit: type=1400 audit(1522131405.435:4): avc: denied { syslog } for pid=3650 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 mcstransd: [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] 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 '10.128.0.5' (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 syzkaller login: [ 27.333934] kasan: CONFIG_KASAN_INLINE enabled [ 27.338694] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 27.356320] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 27.356326] Dumping ftrace buffer: [ 27.356330] (ftrace buffer empty) [ 27.356334] Modules linked in: [ 27.356341] CPU: 1 PID: 3819 Comm: syzkaller526057 Not tainted 4.9.90-gdd1e37e #66 [ 27.356344] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 27.356349] task: ffff8801b3a1b000 task.stack: ffff8801d8968000 [ 27.356365] RIP: 0010:[] [] __free_pages+0x21/0x80 [ 27.356368] RSP: 0018:ffff8801d896fab0 EFLAGS: 00010a07 [ 27.356373] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff8266905b [ 27.356377] RDX: 1bd5a9d5a0000003 RSI: 0000000000000000 RDI: dead4ead0000001c [ 27.356380] RBP: ffff8801d896fac0 R08: 0000000000000000 R09: ffffed003a1e94b9 [ 27.356384] R10: 0000000000000005 R11: ffffed003a1e94b8 R12: 0000000000000004 [ 27.356388] R13: 0000000000000020 R14: ffff8801d52fc200 R15: dffffc0000000000 [ 27.356393] FS: 00007f7e2bb92700(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 27.356397] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 27.356401] CR2: 00007f5d9f405a30 CR3: 00000001da3e6000 CR4: 0000000000160670 [ 27.356409] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 27.356412] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 27.356413] Stack: [ 27.356424] 0000000000000001 ffff8801d52fc358 ffff8801d896fb20 ffffffff82669081 [ 27.356433] ffff8801d52fc370 ffffed003aa5f86b ffffed003aa5f86e ffff8801d52fc368 [ 27.356442] dead4ead00000000 ffff8801d52fc340 0000000000000000 0000000000000000 [ 27.356443] Call Trace: [ 27.356454] [] sg_remove_scat.isra.19+0x1c1/0x2d0 [ 27.356462] [] sg_finish_rem_req+0x2a6/0x320 [ 27.356468] [] sg_read+0xa22/0x1470 [ 27.356476] [] ? sg_proc_seq_show_debug+0xd90/0xd90 [ 27.356484] [] ? debug_check_no_locks_freed+0x2c0/0x2c0 [ 27.356492] [] ? sg_proc_seq_show_debug+0xd90/0xd90 [ 27.356500] [] __vfs_read+0x103/0x670 [ 27.356507] [] ? default_llseek+0x290/0x290 [ 27.356514] [] ? fsnotify+0x86/0xf30 [ 27.356520] [] ? fsnotify+0xf30/0xf30 [ 27.356530] [] ? avc_policy_seqno+0x9/0x20 [ 27.356537] [] ? selinux_file_permission+0x82/0x460 [ 27.356544] [] ? security_file_permission+0x89/0x1e0 [ 27.356551] [] ? rw_verify_area+0xe5/0x2b0 [ 27.356558] [] vfs_read+0x11e/0x380 [ 27.356565] [] SyS_read+0xd9/0x1b0 [ 27.356572] [] ? vfs_copy_file_range+0x740/0x740 [ 27.356579] [] ? trace_hardirqs_on_caller+0x38b/0x590 [ 27.356586] [] ? do_syscall_64+0x48/0x490 [ 27.356594] [] ? vfs_copy_file_range+0x740/0x740 [ 27.356600] [] do_syscall_64+0x1a4/0x490 [ 27.356609] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 27.356711] Code: e9 27 fc ff ff 0f 1f 44 00 00 48 b8 00 00 00 00 00 fc ff df 55 48 89 e5 53 48 89 fb 48 83 c7 1c 48 89 fa 48 83 ec 08 48 c1 ea 03 <0f> b6 14 02 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 04 84 d2 75 3d [ 27.356719] RIP [] __free_pages+0x21/0x80 [ 27.356721] RSP [ 27.356727] ---[ end trace bb296f60a7359125 ]--- [ 27.356731] Kernel panic - not syncing: Fatal exception [ 27.357152] Dumping ftrace buffer: [ 27.357154] (ftrace buffer empty) [ 27.357156] Kernel Offset: disabled [ 27.691809] Rebooting in 86400 seconds..