[ 20.329169] random: sshd: uninitialized urandom read (32 bytes read, 32 bits of entropy available) [....] 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. [ 20.587305] random: sshd: uninitialized urandom read (32 bytes read, 32 bits of entropy available) [ 20.901808] random: sshd: uninitialized urandom read (32 bytes read, 34 bits of entropy available) Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 21.817353] random: sshd: uninitialized urandom read (32 bytes read, 100 bits of entropy available) [ 21.987206] random: sshd: uninitialized urandom read (32 bytes read, 105 bits of entropy available) Warning: Permanently added '10.128.0.13' (ECDSA) to the list of known hosts. [ 27.389719] random: sshd: uninitialized urandom read (32 bytes read, 113 bits of entropy available) executing program [ 27.477244] ================================================================== [ 27.484622] BUG: KASAN: slab-out-of-bounds in sg_remove_request+0xf9/0x110 [ 27.491602] Read of size 8 at addr ffff8800aa4b8140 by task syzkaller892621/3774 [ 27.499100] [ 27.500700] CPU: 1 PID: 3774 Comm: syzkaller892621 Not tainted 4.4.119-g855ea74 #27 [ 27.508458] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 27.517779] 0000000000000000 34c53bae84bb28c3 ffff8801d8fafab0 ffffffff81d0402d [ 27.525744] ffffea0002a92e00 ffff8800aa4b8140 0000000000000000 ffff8800aa4b8140 [ 27.533703] ffff8801d8eda338 ffff8801d8fafae8 ffffffff814fe103 ffff8800aa4b8140 [ 27.541681] Call Trace: [ 27.544241] [] dump_stack+0xc1/0x124 [ 27.549574] [] print_address_description+0x73/0x260 [ 27.556209] [] kasan_report+0x285/0x370 [ 27.561803] [] ? sg_remove_request+0xf9/0x110 [ 27.567921] [] __asan_report_load8_noabort+0x14/0x20 [ 27.574642] [] sg_remove_request+0xf9/0x110 [ 27.580582] [] sg_finish_rem_req+0x295/0x340 [ 27.586608] [] sg_read+0xa1b/0x1490 [ 27.591851] [] ? new_slab+0x24f/0x3b0 [ 27.597267] [] ? sg_proc_seq_show_debug+0xda0/0xda0 [ 27.603906] [] ? __raw_spin_lock_init+0x1c/0x100 [ 27.610280] [] ? lockdep_init_map+0xeb/0x1690 [ 27.616405] [] ? sg_proc_seq_show_debug+0xda0/0xda0 [ 27.623042] [] __vfs_read+0x103/0x440 [ 27.628460] [] ? vfs_iter_write+0x2d0/0x2d0 [ 27.634396] [] ? fsnotify+0x5ad/0xee0 [ 27.639812] [] ? fsnotify+0xee0/0xee0 [ 27.645231] [] ? fasync_helper+0x7a/0xb0 [ 27.650916] [] ? avc_policy_seqno+0x9/0x20 [ 27.656770] [] ? selinux_file_permission+0x348/0x460 [ 27.663490] [] ? security_file_permission+0x89/0x1e0 [ 27.670217] [] ? rw_verify_area+0x100/0x2f0 [ 27.676156] [] vfs_read+0x123/0x3a0 [ 27.681399] [] SyS_read+0xd9/0x1b0 [ 27.686559] [] ? do_sendfile+0xd30/0xd30 [ 27.692239] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 27.698702] [] entry_SYSCALL_64_fastpath+0x1c/0x98 [ 27.705244] [ 27.706843] Allocated by task 0: [ 27.710170] (stack is not available) [ 27.713849] [ 27.715446] Freed by task 0: [ 27.718430] (stack is not available) [ 27.722105] [ 27.723701] The buggy address belongs to the object at ffff8800aa4b8100 [ 27.723701] which belongs to the cache fasync_cache of size 96 [ 27.736323] The buggy address is located 64 bytes inside of [ 27.736323] 96-byte region [ffff8800aa4b8100, ffff8800aa4b8160) [ 27.747993] The buggy address belongs to the page: [ 27.771353] kasan: CONFIG_KASAN_INLINE enabled [ 27.775781] kasan: GPF could be caused by NULL-ptr deref or user memory accessgeneral protection fault: 0000 [#1] PREEMPT SMP KASAN [ 27.788671] Dumping ftrace buffer: [ 27.792192] (ftrace buffer empty) [ 27.795881] Modules linked in: [ 27.799176] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 4.4.119-g855ea74 #27 [ 27.806166] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 27.815498] task: ffffffff84217840 task.stack: ffffffff84200000 [ 27.821530] RIP: 0010:[] [] debug_object_deactivate+0x1a6/0x3c0 [ 27.830910] RSP: 0018:ffff8801db207d20 EFLAGS: 00010006 [ 27.836335] RAX: 0000000000000092 RBX: 00000000006ce018 RCX: ffff8801db219c40 [ 27.843590] RDX: 00000000000d9c06 RSI: ffffffff842c6460 RDI: 00000000006ce030 [ 27.850850] RBP: ffff8801db207de8 R08: 1ffff1003afa861f R09: ffffffff8512d750 [ 27.858109] R10: 0000000000000001 R11: 1ffff1003b640f6a R12: 1ffff1003b640fa8 [ 27.865364] R13: 0000000000049b2b R14: dffffc0000000000 R15: ffffffff8580af08 [ 27.872627] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 27.880845] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 27.886714] CR2: 0000557b72b9c100 CR3: 00000001d9746000 CR4: 0000000000160670 [ 27.893976] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 27.901233] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 27.908494] Stack: [ 27.910630] 000000000000003d ffffffff842c6460 ffff8801db219c40 0000000000000092 [ 27.918676] 0000000041b58ab3 ffffffff83fce929 ffffffff81d65e00 ffffffff84217840 [ 27.926702] fffffbfff0843021 ffff8801db219658 ffffffff84218110 0000000000000000 [ 27.934750] Call Trace: [ 27.937318] [ 27.939374] [] ? debug_object_activate+0x500/0x500 [ 27.946242] [] ? __lock_is_held+0xa1/0xf0 [ 27.952058] [] __hrtimer_run_queues+0x492/0xfe0 [ 27.958367] [] ? hrtimer_fixup_init+0x70/0x70 [ 27.964500] [] ? hrtimer_interrupt+0x131/0x440 [ 27.970728] [] hrtimer_interrupt+0x1a6/0x440 [ 27.976781] [] local_apic_timer_interrupt+0x6a/0xb0 [ 27.983438] [] smp_apic_timer_interrupt+0x76/0xa0 [ 27.989918] [] apic_timer_interrupt+0xa0/0xb0 [ 27.996045] [ 27.998104] [] ? native_safe_halt+0x6/0x10 [ 28.004283] [] default_idle+0x55/0x3c0 [ 28.009813] [] arch_cpu_idle+0xa/0x10 [ 28.015254] [] default_idle_call+0x48/0x70 [ 28.021136] [] cpu_startup_entry+0x5fd/0x8f0 [ 28.027185] [] ? _raw_spin_unlock_irqrestore+0x5a/0x70 [ 28.034107] [] ? call_cpuidle+0xe0/0xe0 [ 28.039727] [] rest_init+0x189/0x190 [ 28.045089] [] start_kernel+0x6b9/0x6ee [ 28.050709] [] ? thread_stack_cache_init+0xb/0xb [ 28.057115] [] ? early_idt_handler_array+0x120/0x120 [ 28.063867] [] ? early_idt_handler_array+0x120/0x120 [ 28.070617] [] x86_64_start_reservations+0x2a/0x2c [ 28.077193] [] x86_64_start_kernel+0x140/0x163 [ 28.083409] Code: eb 1a 48 89 da 48 c1 ea 03 42 80 3c 32 00 0f 85 86 01 00 00 48 8b 1b 48 85 db 74 7a 48 8d 7b 18 41 83 c5 01 48 89 fa 48 c1 ea 03 <42> 80 3c 32 00 0f 85 3c 01 00 00 48 3b 4b 18 75 c6 48 8d 7b 10 [ 28.110898] RIP [] debug_object_deactivate+0x1a6/0x3c0 [ 28.117948] RSP [ 28.121557] ---[ end trace 188b2210feae301f ]--- [ 28.126302] Kernel panic - not syncing: Fatal exception in interrupt [ 29.261845] Shutting down cpus with NMI [ 29.266730] Dumping ftrace buffer: [ 29.270248] (ftrace buffer empty) [ 29.273933] Kernel Offset: disabled [ 29.277525] Rebooting in 86400 seconds..