[ 16.420784] 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. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 21.299069] random: sshd: uninitialized urandom read (32 bytes read, 38 bits of entropy available) [ 21.603623] random: sshd: uninitialized urandom read (32 bytes read, 38 bits of entropy available) [ 22.420906] random: sshd: uninitialized urandom read (32 bytes read, 98 bits of entropy available) [ 22.598410] random: sshd: uninitialized urandom read (32 bytes read, 102 bits of entropy available) Warning: Permanently added '10.128.15.213' (ECDSA) to the list of known hosts. [ 27.985583] random: sshd: uninitialized urandom read (32 bytes read, 109 bits of entropy available) executing program [ 28.079625] ================================================================== [ 28.087030] BUG: KASAN: slab-out-of-bounds in sg_remove_request+0xf9/0x110 [ 28.094021] Read of size 8 at addr ffff8800b40fb140 by task syzkaller951842/3319 [ 28.101531] [ 28.103135] CPU: 1 PID: 3319 Comm: syzkaller951842 Not tainted 4.4.111-g3301b55 #24 [ 28.110907] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 28.120232] 0000000000000000 9ec2a6dcba925658 ffff8801d0ab7ab0 ffffffff81d0509d [ 28.128212] ffffea0002d03ec0 ffff8800b40fb140 0000000000000000 ffff8800b40fb140 [ 28.136177] ffff8800b4270238 ffff8801d0ab7ae8 ffffffff814fd433 ffff8800b40fb140 [ 28.144152] Call Trace: [ 28.146712] [] dump_stack+0xc1/0x124 [ 28.152059] [] print_address_description+0x73/0x260 [ 28.158693] [] kasan_report+0x285/0x370 [ 28.164292] [] ? sg_remove_request+0xf9/0x110 [ 28.170406] [] __asan_report_load8_noabort+0x14/0x20 [ 28.177126] [] sg_remove_request+0xf9/0x110 [ 28.183069] [] sg_finish_rem_req+0x295/0x340 [ 28.189092] [] sg_read+0xa21/0x1490 [ 28.194341] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 28.200981] [] ? new_slab+0x2df/0x3b0 [ 28.206405] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 28.213048] [] __vfs_read+0x103/0x440 [ 28.218471] [] ? debug_check_no_locks_freed+0x2c0/0x2c0 [ 28.225456] [] ? vfs_iter_write+0x2d0/0x2d0 [ 28.231394] [] ? fsnotify+0x5ad/0xee0 [ 28.236808] [] ? fsnotify+0xee0/0xee0 [ 28.242227] [] ? lockdep_init_map+0xeb/0x1690 [ 28.248357] [] ? avc_policy_seqno+0x9/0x20 [ 28.254209] [] ? selinux_file_permission+0x348/0x460 [ 28.260932] [] ? security_file_permission+0x89/0x1e0 [ 28.267660] [] ? rw_verify_area+0x100/0x2f0 [ 28.273604] [] vfs_read+0x123/0x3a0 [ 28.278843] [] SyS_read+0xd9/0x1b0 [ 28.284007] [] ? do_sendfile+0xd30/0xd30 [ 28.289687] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 28.296150] [] entry_SYSCALL_64_fastpath+0x16/0x92 [ 28.302697] [ 28.304289] Allocated by task 0: [ 28.307616] (stack is not available) [ 28.311294] [ 28.312888] Freed by task 0: [ 28.315868] (stack is not available) [ 28.319544] [ 28.321137] The buggy address belongs to the object at ffff8800b40fb100 [ 28.321137] which belongs to the cache fasync_cache of size 96 [ 28.334372] The buggy address is located 64 bytes inside of [ 28.334372] 96-byte region [ffff8800b40fb100, ffff8800b40fb160) [ 28.346052] The buggy address belongs to the page: [ 28.360129] kasan: CONFIG_KASAN_INLINE enabled [ 28.364560] kasan: GPF could be caused by NULL-ptr deref or user memory accessgeneral protection fault: 0000 [#1] PREEMPT SMP KASAN [ 28.377456] Dumping ftrace buffer: [ 28.381004] (ftrace buffer empty) [ 28.384707] Modules linked in: [ 28.388016] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 4.4.111-g3301b55 #24 [ 28.395073] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 28.404475] task: ffffffff84217840 task.stack: ffffffff84200000 [ 28.410529] RIP: 0010:[] [] rb_insert_color+0x9f/0xcb0 [ 28.419170] RSP: 0018:ffff8801db207d18 EFLAGS: 00010003 [ 28.424611] RAX: 0a0508a8e82a0be9 RBX: ffffffff838a83a0 RCX: ffffffff838a83a0 [ 28.431874] RDX: 1ffffffff0715075 RSI: ffff8801db219710 RDI: ffff8801db219c40 [ 28.439136] RBP: ffff8801db207d60 R08: ffffffff85807f08 R09: 0000000000000001 [ 28.446396] R10: 0000000000000000 R11: 1ffff1003b640f62 R12: ffff8801d0a57df8 [ 28.453663] R13: 5028454741505f4e R14: ffff8801db219c40 R15: dffffc0000000000 [ 28.460925] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 28.469140] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 28.475014] CR2: 000055fb44234120 CR3: 00000001d26ba000 CR4: 0000000000160670 [ 28.482277] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 28.489629] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 28.496891] Stack: [ 28.499031] ffffffff842bcb20 ffffffff842180b0 0000000000000000 ffff8801db207d70 [ 28.507071] ffff8801db219c40 dffffc0000000000 0000000000000000 ffff8801db219710 [ 28.515112] ffff8801d0a57e00 ffff8801db207db0 ffffffff81d22967 ffff8801db219c58 [ 28.523137] Call Trace: [ 28.525699] [ 28.527756] [] timerqueue_add+0x157/0x2a0 [ 28.533851] [] enqueue_hrtimer+0x168/0x450 [ 28.539735] [] __hrtimer_run_queues+0x732/0xfe0 [ 28.546055] [] ? hrtimer_fixup_init+0x70/0x70 [ 28.552197] [] ? hrtimer_interrupt+0x131/0x440 [ 28.558428] [] hrtimer_interrupt+0x1a6/0x440 [ 28.564496] [] local_apic_timer_interrupt+0x6a/0xb0 [ 28.571165] [] smp_apic_timer_interrupt+0x76/0xa0 [ 28.577658] [] apic_timer_interrupt+0xa0/0xb0 [ 28.583787] [ 28.585849] [] ? native_safe_halt+0x6/0x10 [ 28.592025] [] default_idle+0x55/0x3c0 [ 28.597558] [] arch_cpu_idle+0xa/0x10 [ 28.603003] [] default_idle_call+0x48/0x70 [ 28.608884] [] cpu_startup_entry+0x605/0x820 [ 28.614940] [] ? call_cpuidle+0xe0/0xe0 [ 28.620561] [] rest_init+0x189/0x190 [ 28.625922] [] start_kernel+0x6b9/0x6ee [ 28.631542] [] ? thread_stack_cache_init+0xb/0xb [ 28.637942] [] ? early_idt_handler_array+0x120/0x120 [ 28.644689] [] ? early_idt_handler_array+0x120/0x120 [ 28.651435] [] x86_64_start_reservations+0x2a/0x2c [ 28.658009] [] x86_64_start_kernel+0x140/0x163 [ 28.664228] Code: 48 89 c2 48 c1 ea 03 42 80 3c 3a 00 0f 85 94 09 00 00 4c 8b 6b 08 4d 39 e5 0f 84 b0 01 00 00 4d 85 ed 74 1d 4c 89 e8 48 c1 e8 03 <42> 80 3c 38 00 0f 85 95 09 00 00 41 f6 45 00 01 0f 84 20 03 00 [ 28.691335] RIP [] rb_insert_color+0x9f/0xcb0 [ 28.697605] RSP [ 28.701227] ---[ end trace 49632a044c8181b8 ]--- [ 28.705971] Kernel panic - not syncing: Fatal exception in interrupt [ 29.818324] Shutting down cpus with NMI [ 29.822727] Dumping ftrace buffer: [ 29.826241] (ftrace buffer empty) [ 29.829920] Kernel Offset: disabled [ 29.833517] Rebooting in 86400 seconds..