[ 16.303660] 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: [ 20.559400] random: sshd: uninitialized urandom read (32 bytes read, 36 bits of entropy available) [ 20.913634] random: sshd: uninitialized urandom read (32 bytes read, 36 bits of entropy available) [ 21.730837] random: sshd: uninitialized urandom read (32 bytes read, 85 bits of entropy available) [ 28.939641] random: sshd: uninitialized urandom read (32 bytes read, 94 bits of entropy available) Warning: Permanently added '10.128.0.47' (ECDSA) to the list of known hosts. [ 34.426327] random: sshd: uninitialized urandom read (32 bytes read, 102 bits of entropy available) executing program [ 34.519299] ================================================================== [ 34.526690] BUG: KASAN: slab-out-of-bounds in sg_remove_request+0xf9/0x110 [ 34.533678] Read of size 8 at addr ffff8800b4a1a140 by task syzkaller648837/3315 [ 34.541180] [ 34.542785] CPU: 1 PID: 3315 Comm: syzkaller648837 Not tainted 4.4.111-g1849cd3 #26 [ 34.550561] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 34.559886] 0000000000000000 c6b1a180fa93a60d ffff8801d13af9f0 ffffffff81d0509d [ 34.567858] ffffea0002d28680 ffff8800b4a1a140 0000000000000000 ffff8800b4a1a140 [ 34.575831] ffff8800b49cc438 ffff8801d13afa28 ffffffff814fd433 ffff8800b4a1a140 [ 34.583806] Call Trace: [ 34.586368] [] dump_stack+0xc1/0x124 [ 34.591712] [] print_address_description+0x73/0x260 [ 34.598349] [] kasan_report+0x285/0x370 [ 34.603945] [] ? sg_remove_request+0xf9/0x110 [ 34.610060] [] __asan_report_load8_noabort+0x14/0x20 [ 34.616780] [] sg_remove_request+0xf9/0x110 [ 34.622724] [] sg_finish_rem_req+0x295/0x340 [ 34.628764] [] sg_read+0xa21/0x1490 [ 34.634013] [] ? __check_object_size+0x154/0x35b [ 34.640389] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 34.647024] [] ? fsnotify+0xee0/0xee0 [ 34.652460] [] ? avc_policy_seqno+0x9/0x20 [ 34.658316] [] do_loop_readv_writev+0x141/0x1e0 [ 34.664604] [] ? security_file_permission+0x89/0x1e0 [ 34.671324] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 34.677959] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 34.684607] [] do_readv_writev+0x5dd/0x6e0 [ 34.690460] [] ? vfs_write+0x530/0x530 [ 34.695978] [] ? _raw_spin_unlock+0x2c/0x50 [ 34.701933] [] ? do_huge_pmd_anonymous_page+0x3dd/0xa10 [ 34.708917] [] ? handle_mm_fault+0x3f2/0x3190 [ 34.715036] [] ? sg_fasync+0x8d/0xb0 [ 34.720369] [] vfs_readv+0x78/0xb0 [ 34.725541] [] SyS_readv+0xd9/0x240 [ 34.730791] [] ? rw_copy_check_uvector+0x2d0/0x2d0 [ 34.737342] [] ? trace_hardirqs_on_thunk+0x17/0x19 [ 34.743895] [] entry_SYSCALL_64_fastpath+0x16/0x92 [ 34.750451] [ 34.752050] Allocated by task 0: [ 34.755386] (stack is not available) [ 34.759064] [ 34.760661] Freed by task 0: [ 34.763646] (stack is not available) [ 34.767326] [ 34.768936] The buggy address belongs to the object at ffff8800b4a1a100 [ 34.768936] which belongs to the cache fasync_cache of size 96 [ 34.781561] The buggy address is located 64 bytes inside of [ 34.781561] 96-byte region [ffff8800b4a1a100, ffff8800b4a1a160) [ 34.793230] The buggy address belongs to the page: [ 36.323691] PANIC: double fault, error_code: 0x0 [ 36.328460] CPU: 1 PID: 3315 Comm: Not tainted 4.4.111-g1849cd3 #26 [ 36.334920] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 36.344247] task: ffff8801d11b0000 task.stack: (null) [ 36.350271] RIP: 0010:[] [] dump_page_badflags+0x8/0x250 [ 36.359038] RSP: 0018:ffff880100000000 EFLAGS: 00010046 [ 36.364457] RAX: ffff8801d11b0000 RBX: ffffea0002d28680 RCX: ffffffff8148f980 [ 36.371696] RDX: 0000000000000000 RSI: ffffffff838a8360 RDI: ffffea0002d28680 [ 36.378935] RBP: ffff880100000010 R08: 0000000000000001 R09: 0000000000000000 [ 36.386174] R10: 0000000000000002 R11: fffffbfff0ad781e R12: 0000000000000000 [ 36.393414] R13: ffffffff838a8360 R14: 0000000000000000 R15: 0000000000000000 [ 36.400654] FS: 0000000000e18880(0063) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 36.408849] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 36.414701] CR2: ffff8800fffffff8 CR3: 00000001d1adc000 CR4: 0000000000160670 [ 36.421944] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 36.429185] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 36.436432] Stack: [ 36.438547] [ 36.440141] Call Trace: [ 36.442701] [ 36.444728] Code: 00 e9 83 fd ff ff e8 a8 e2 06 00 e9 50 fd ff ff e8 9e e2 06 00 e9 1d fd ff ff 66 0f 1f 84 00 00 00 00 00 55 48 89 e5 41 57 41 56 <41> 55 49 89 f5 41 54 49 89 d4 53 48 89 fb 48 83 ec 08 e8 61 06 [ 36.472092] Kernel panic - not syncing: Machine halted. [ 36.477425] CPU: 1 PID: 3315 Comm: Not tainted 4.4.111-g1849cd3 #26 [ 36.483885] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 36.493219] 0000000000000000 c6b1a180fa93a60d ffff8801db30ce38 ffffffff81d0509d [ 36.501194] ffffffff838367c0 ffff8801db30cf10 ffffffff83808040 ffff880100000000 [ 36.509165] 0000000000000000 ffff8801db30cf00 ffffffff81419a3a 0000000041b58ab3 [ 36.517135] Call Trace: [ 36.519695] <#DF> [] dump_stack+0xc1/0x124 [ 36.525777] [] panic+0x1aa/0x388 [ 36.530765] [] ? percpu_up_read.constprop.45+0xe1/0xe1 [ 36.537679] [] ? vprintk_emit+0x242/0x850 [ 36.540280] kasan: CONFIG_KASAN_INLINE enabled [ 36.540286] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 36.540289] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 36.540292] Dumping ftrace buffer: [ 36.540295] (ftrace buffer empty) [ 36.540297] Modules linked in: [ 36.540302] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 4.4.111-g1849cd3 #26 [ 36.540304] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 36.540307] task: ffffffff84217840 task.stack: ffffffff84200000 [ 36.540316] RIP: 0010:[] [] rb_insert_color+0x9f/0xcb0 [ 36.540318] RSP: 0018:ffff8801db207d18 EFLAGS: 00010003 [ 36.540320] RAX: 0a0508a8e82a0be9 RBX: ffffffff838a8360 RCX: ffffffff838a8360 [ 36.540322] RDX: 1ffffffff071506d RSI: ffff8801db219710 RDI: ffff8801db219c40 [ 36.540324] RBP: ffff8801db207d60 R08: ffffffff85807f08 R09: 0000000000000001 [ 36.540326] R10: 0000000000000000 R11: 1ffff1003b640f62 R12: ffff8801d0c0fdf8 [ 36.540328] R13: 5028454741505f4e R14: ffff8801db219c40 R15: dffffc0000000000 [ 36.540331] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 36.540334] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 36.540336] CR2: 0000559a3b954110 CR3: 00000001d52be000 CR4: 0000000000160670 [ 36.540341] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 36.540342] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 36.540343] Stack: [ 36.540347] ffffffff842bcb20 ffffffff842180b0 0000000000000000 ffff8801db207d70 [ 36.540351] ffff8801db219c40 dffffc0000000000 0000000000000000 ffff8801db219710 [ 36.540355] ffff8801d0c0fe00 ffff8801db207db0 ffffffff81d22967 ffff8801db219c58 [ 36.540356] Call Trace: [ 36.540363] [ 36.540364] [] timerqueue_add+0x157/0x2a0 [ 36.540369] [] enqueue_hrtimer+0x168/0x450 [ 36.540374] [] __hrtimer_run_queues+0x732/0xfe0 [ 36.540377] [] ? hrtimer_fixup_init+0x70/0x70 [ 36.540381] [] ? hrtimer_interrupt+0x131/0x440 [ 36.540384] [] hrtimer_interrupt+0x1a6/0x440 [ 36.540390] [] local_apic_timer_interrupt+0x6a/0xb0 [ 36.540396] [] smp_apic_timer_interrupt+0x76/0xa0 [ 36.540399] [] apic_timer_interrupt+0xa0/0xb0 [ 36.540405] [ 36.540405] [] ? check_preemption_disabled+0x3b/0x200 [ 36.540411] [] ? native_safe_halt+0x6/0x10 [ 36.540416] [] default_idle+0x55/0x3c0 [ 36.540420] [] arch_cpu_idle+0xa/0x10 [ 36.540425] [] default_idle_call+0x48/0x70 [ 36.540429] [] cpu_startup_entry+0x605/0x820 [ 36.540432] [] ? call_cpuidle+0xe0/0xe0 [ 36.540438] [] rest_init+0x189/0x190 [ 36.540442] [] start_kernel+0x6b9/0x6ee [ 36.540445] [] ? thread_stack_cache_init+0xb/0xb [ 36.540454] [] ? early_idt_handler_array+0x120/0x120 [ 36.540457] [] ? early_idt_handler_array+0x120/0x120 [ 36.540460] [] x86_64_start_reservations+0x2a/0x2c [ 36.540463] [] x86_64_start_kernel+0x140/0x163 [ 36.540510] 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 [ 36.540514] RIP [] rb_insert_color+0x9f/0xcb0 [ 36.540515] RSP [ 36.540518] ---[ end trace 54c7ae773c9ccb0e ]--- [ 36.884968] [] ? dump_page_badflags+0x1d/0x250 [ 36.891172] [] ? vprintk_emit+0x242/0x850 [ 36.896948] [] df_debug+0x2d/0x30 [ 36.902026] [] do_double_fault+0x10b/0x210 [ 36.907885] [] double_fault+0x2d/0x40 [ 36.913304] [] ? dump_page_badflags+0x180/0x250 [ 36.919602] [] ? dump_page_badflags+0x8/0x250 [ 36.925712] <> [ 37.990197] Shutting down cpus with NMI [ 37.994904] Dumping ftrace buffer: [ 37.998414] (ftrace buffer empty) [ 38.002093] Kernel Offset: disabled [ 38.005687] Rebooting in 86400 seconds..