[....] Starting file context maintaining daemon: restorecond[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 20.906790] random: sshd: uninitialized urandom read (32 bytes read, 33 bits of entropy available) [?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [ 21.701406] random: sshd: uninitialized urandom read (32 bytes read, 34 bits of entropy available) [ 22.014917] random: sshd: uninitialized urandom read (32 bytes read, 36 bits of entropy available) Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 23.021050] random: sshd: uninitialized urandom read (32 bytes read, 118 bits of entropy available) [ 23.185045] random: sshd: uninitialized urandom read (32 bytes read, 122 bits of entropy available) Warning: Permanently added '10.128.0.60' (ECDSA) to the list of known hosts. [ 28.557648] random: nonblocking pool is initialized executing program [ 28.660437] ================================================================== [ 28.667829] BUG: KASAN: slab-out-of-bounds in sg_remove_request+0xf9/0x110 [ 28.674820] Read of size 8 at addr ffff8801c975c140 by task syzkaller023228/3779 [ 28.682319] [ 28.683919] CPU: 1 PID: 3779 Comm: syzkaller023228 Not tainted 4.4.119-g855ea74 #27 [ 28.691679] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 28.701002] 0000000000000000 9d9b38232b12a0e2 ffff8801d91e7ab0 ffffffff81d0402d [ 28.708984] ffffea000725d700 ffff8801c975c140 0000000000000000 ffff8801c975c140 [ 28.716959] ffff8801d91b8238 ffff8801d91e7ae8 ffffffff814fe103 ffff8801c975c140 [ 28.724930] Call Trace: [ 28.727490] [] dump_stack+0xc1/0x124 [ 28.732822] [] print_address_description+0x73/0x260 [ 28.739455] [] kasan_report+0x285/0x370 [ 28.745049] [] ? sg_remove_request+0xf9/0x110 [ 28.751161] [] __asan_report_load8_noabort+0x14/0x20 [ 28.757882] [] sg_remove_request+0xf9/0x110 [ 28.763822] [] sg_finish_rem_req+0x295/0x340 [ 28.769847] [] sg_read+0xa1b/0x1490 [ 28.775092] [] ? sg_proc_seq_show_debug+0xda0/0xda0 [ 28.781728] [] ? new_slab+0x2df/0x3b0 [ 28.787150] [] ? sg_proc_seq_show_debug+0xda0/0xda0 [ 28.793787] [] __vfs_read+0x103/0x440 [ 28.799211] [] ? debug_check_no_locks_freed+0x2c0/0x2c0 [ 28.806194] [] ? vfs_iter_write+0x2d0/0x2d0 [ 28.812132] [] ? fsnotify+0x5ad/0xee0 [ 28.817549] [] ? fsnotify+0xee0/0xee0 [ 28.822968] [] ? lockdep_init_map+0xeb/0x1690 [ 28.829084] [] ? avc_policy_seqno+0x9/0x20 [ 28.834941] [] ? selinux_file_permission+0x348/0x460 [ 28.841663] [] ? security_file_permission+0x89/0x1e0 [ 28.848383] [] ? rw_verify_area+0x100/0x2f0 [ 28.854503] [] vfs_read+0x123/0x3a0 [ 28.859746] [] SyS_read+0xd9/0x1b0 [ 28.864904] [] ? do_sendfile+0xd30/0xd30 [ 28.870584] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 28.877049] [] entry_SYSCALL_64_fastpath+0x1c/0x98 [ 28.883594] [ 28.885192] Allocated by task 0: [ 28.888522] (stack is not available) [ 28.892201] [ 28.893799] Freed by task 0: [ 28.896784] (stack is not available) [ 28.900463] [ 28.902060] The buggy address belongs to the object at ffff8801c975c100 [ 28.902060] which belongs to the cache fasync_cache of size 96 [ 28.914685] The buggy address is located 64 bytes inside of [ 28.914685] 96-byte region [ffff8801c975c100, ffff8801c975c160) [ 28.926352] The buggy address belongs to the page: [ 28.950055] kasan: CONFIG_KASAN_INLINE enabled [ 28.954500] kasan: GPF could be caused by NULL-ptr deref or user memory accessgeneral protection fault: 0000 [#1] PREEMPT SMP KASAN [ 28.967404] Dumping ftrace buffer: [ 28.970927] (ftrace buffer empty) [ 28.974622] Modules linked in: [ 28.977928] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 4.4.119-g855ea74 #27 [ 28.984920] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 28.994259] task: ffffffff84217840 task.stack: ffffffff84200000 [ 29.000296] RIP: 0010:[] [] irq_may_run+0x45/0x100 [ 29.008560] RSP: 0018:ffff8801db207e80 EFLAGS: 00010046 [ 29.013986] RAX: dffffc0000000000 RBX: ffff8801d49aea00 RCX: ffffffff81277451 [ 29.021242] RDX: 0000000000000000 RSI: ffffffff8513f390 RDI: ffff8801d49aea30 [ 29.028500] RBP: ffff8801db207e98 R08: 0000000000000001 R09: ffffffff8513f390 [ 29.035766] R10: 0000000000000000 R11: 1ffff1003b640f9c R12: 0000000000000000 [ 29.043028] R13: ffffffff84207db0 R14: ffffffff84200000 R15: 0000000000000000 [ 29.050286] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 29.058504] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 29.064377] CR2: 000055e62f16d100 CR3: 00000001d92c2000 CR4: 0000000000160670 [ 29.071639] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 29.078902] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 29.086155] Stack: [ 29.088288] ffff8801d49aea00 ffff8801d49aea74 ffffffff84207db0 ffff8801db207f00 [ 29.096323] ffffffff81278759 ffffffff84218108 00000000db207f10 0000000000000046 [ 29.104360] ffffffff84218110 0000000000000000 ffff8801d49aeaa0 ffff8801d49aea00 [ 29.112407] Call Trace: [ 29.114978] [ 29.117031] [] handle_edge_irq+0x69/0x8e0 [ 29.123127] [] handle_irq+0x250/0x3a0 [ 29.128567] [] ? check_preemption_disabled+0x3b/0x200 [ 29.135400] [] do_IRQ+0x89/0x1b0 [ 29.140406] [] common_interrupt+0xa0/0xa0 [ 29.146187] [ 29.148248] [] ? native_safe_halt+0x6/0x10 [ 29.154430] [] default_idle+0x55/0x3c0 [ 29.159958] [] arch_cpu_idle+0xa/0x10 [ 29.165399] [] default_idle_call+0x48/0x70 [ 29.171281] [] cpu_startup_entry+0x5fd/0x8f0 [ 29.177330] [] ? _raw_spin_unlock_irqrestore+0x5a/0x70 [ 29.184252] [] ? call_cpuidle+0xe0/0xe0 [ 29.189876] [] rest_init+0x189/0x190 [ 29.195234] [] start_kernel+0x6b9/0x6ee [ 29.200871] [] ? thread_stack_cache_init+0xb/0xb [ 29.207275] [] ? early_idt_handler_array+0x120/0x120 [ 29.214024] [] ? early_idt_handler_array+0x120/0x120 [ 29.220784] [] x86_64_start_reservations+0x2a/0x2c [ 29.227368] [] x86_64_start_kernel+0x140/0x163 [ 29.233584] Code: 00 00 fc ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 c2 00 00 00 48 b8 00 00 00 00 00 fc ff df 4c 8b 63 30 4c 89 e2 48 c1 ea 03 <0f> b6 04 02 84 c0 74 08 3c 03 0f 8e 89 00 00 00 41 f7 04 24 00 [ 29.261147] RIP [] irq_may_run+0x45/0x100 [ 29.267069] RSP [ 29.270687] ---[ end trace eaca2e3a6c6fb0a3 ]--- [ 29.275425] Kernel panic - not syncing: Fatal exception in interrupt [ 30.419990] Shutting down cpus with NMI [ 30.424402] Dumping ftrace buffer: [ 30.427917] (ftrace buffer empty) [ 30.431599] Kernel Offset: disabled [ 30.435195] Rebooting in 86400 seconds..