INIT: Entering runlevel: 2 [[36minfo[39;49m] Using makefile-style concurrent boot in runlevel 2. [....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting periodic command scheduler: cron[?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 '10.128.0.57' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 38.392053] kasan: CONFIG_KASAN_INLINE enabled [ 38.396722] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 38.404102] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 38.410309] Dumping ftrace buffer: [ 38.413831] (ftrace buffer empty) [ 38.417786] Modules linked in: [ 38.421079] CPU: 1 PID: 3703 Comm: syzkaller012858 Not tainted 4.9.90-gdd4d08c #67 [ 38.428761] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 38.438089] task: ffff8801c0edc800 task.stack: ffff8801bf740000 [ 38.444114] RIP: 0010:[] [] __free_pages+0x21/0x80 [ 38.452350] RSP: 0018:ffff8801bf747a58 EFLAGS: 00010a07 [ 38.457769] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff8266905b [ 38.465008] RDX: 1bd5a9d5a0000003 RSI: 0000000000000001 RDI: dead4ead0000001c [ 38.472248] RBP: ffff8801bf747a68 R08: 0000000000000001 R09: 0000000000000000 [ 38.479500] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000004 [ 38.486740] R13: 0000000000000020 R14: ffff8801c0b92100 R15: dffffc0000000000 [ 38.493982] FS: 000000000151e880(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 38.502179] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 38.508031] CR2: 0000000020eeafd7 CR3: 00000001c1d78000 CR4: 0000000000160670 [ 38.515272] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 38.522512] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 38.529751] Stack: [ 38.531870] 0000000000000046 ffff8801c0b92258 ffff8801bf747ac8 ffffffff82669081 [ 38.539848] ffff8801c0b92270 ffffed003817244b ffffed003817244e ffff8801c0b92268 [ 38.547826] dead4ead00000000 ffff8801c0b92240 0000000000000000 0000000000000000 [ 38.555797] Call Trace: [ 38.558358] [] sg_remove_scat.isra.19+0x1c1/0x2d0 [ 38.564817] [] sg_finish_rem_req+0x2a6/0x320 [ 38.570841] [] ? trace_hardirqs_on_caller+0x38b/0x590 [ 38.577652] [] sg_new_read+0x3c/0x440 [ 38.583069] [] ? sg_get_rq_mark+0x142/0x190 [ 38.589008] [] sg_read+0x8c5/0x1470 [ 38.594251] [] ? sg_proc_seq_show_debug+0xd90/0xd90 [ 38.600886] [] ? do_huge_pmd_anonymous_page+0xb05/0x10d0 [ 38.607953] [] ? sg_proc_seq_show_debug+0xd90/0xd90 [ 38.614589] [] __vfs_read+0x103/0x670 [ 38.620009] [] ? default_llseek+0x290/0x290 [ 38.625946] [] ? fsnotify+0x86/0xf30 [ 38.631277] [] ? fsnotify+0xf30/0xf30 [ 38.636694] [] ? avc_policy_seqno+0x9/0x20 [ 38.642547] [] ? selinux_file_permission+0x82/0x460 [ 38.649181] [] ? security_file_permission+0x89/0x1e0 [ 38.655905] [] ? rw_verify_area+0xe5/0x2b0 [ 38.661760] [] vfs_read+0x11e/0x380 [ 38.667009] [] SyS_read+0xd9/0x1b0 [ 38.672170] [] ? vfs_copy_file_range+0x740/0x740 [ 38.678631] [] ? do_syscall_64+0x48/0x490 [ 38.684402] [] ? vfs_copy_file_range+0x740/0x740 [ 38.690799] [] do_syscall_64+0x1a4/0x490 [ 38.696572] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 38.703464] 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 [ 38.730047] RIP [] __free_pages+0x21/0x80 [ 38.735932] RSP [ 38.739928] ---[ end trace 35cfde5e7835e4f7 ]--- [ 38.744665] Kernel panic - not syncing: Fatal exception [ 38.750379] Dumping ftrace buffer: [ 38.753895] (ftrace buffer empty) [ 38.757576] Kernel Offset: disabled [ 38.761172] Rebooting in 86400 seconds..