[ 18.849798] 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: [ 20.276657] random: sshd: uninitialized urandom read (32 bytes read, 34 bits of entropy available) [ 20.631267] random: sshd: uninitialized urandom read (32 bytes read, 34 bits of entropy available) [ 21.515896] random: sshd: uninitialized urandom read (32 bytes read, 94 bits of entropy available) [ 21.691935] random: sshd: uninitialized urandom read (32 bytes read, 98 bits of entropy available) Warning: Permanently added '10.128.0.49' (ECDSA) to the list of known hosts. [ 27.131851] random: sshd: uninitialized urandom read (32 bytes read, 106 bits of entropy available) executing program [ 27.224054] ================================================================== [ 27.231436] BUG: KASAN: slab-out-of-bounds in sg_remove_request+0xf9/0x110 [ 27.238420] Read of size 8 at addr ffff8801ca6c7140 by task syzkaller182914/3679 [ 27.245917] [ 27.247518] CPU: 0 PID: 3679 Comm: syzkaller182914 Not tainted 4.4.120-gd63fdf6 #28 [ 27.255276] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 27.264597] 0000000000000000 c1083182b4508780 ffff8801cc6a7ab0 ffffffff81d0408d [ 27.272560] ffffea000729b1c0 ffff8801ca6c7140 0000000000000000 ffff8801ca6c7140 [ 27.280518] ffff8801ca6e2338 ffff8801cc6a7ae8 ffffffff814fe143 ffff8801ca6c7140 [ 27.288475] Call Trace: [ 27.291035] [] dump_stack+0xc1/0x124 [ 27.296368] [] print_address_description+0x73/0x260 [ 27.303001] [] kasan_report+0x285/0x370 [ 27.308982] [] ? sg_remove_request+0xf9/0x110 [ 27.315098] [] __asan_report_load8_noabort+0x14/0x20 [ 27.321816] [] sg_remove_request+0xf9/0x110 [ 27.327754] [] sg_finish_rem_req+0x295/0x340 [ 27.333778] [] sg_read+0xa1b/0x1490 [ 27.339020] [] ? sg_proc_seq_show_debug+0xda0/0xda0 [ 27.345651] [] ? new_slab+0x2df/0x3b0 [ 27.351069] [] ? sg_proc_seq_show_debug+0xda0/0xda0 [ 27.357704] [] __vfs_read+0x103/0x440 [ 27.363120] [] ? debug_check_no_locks_freed+0x2c0/0x2c0 [ 27.370100] [] ? vfs_iter_write+0x2d0/0x2d0 [ 27.376041] [] ? fsnotify+0x5ad/0xee0 [ 27.381464] [] ? fsnotify+0xee0/0xee0 [ 27.386880] [] ? lockdep_init_map+0xeb/0x1690 [ 27.392994] [] ? avc_policy_seqno+0x9/0x20 [ 27.398845] [] ? selinux_file_permission+0x348/0x460 [ 27.405563] [] ? security_file_permission+0x89/0x1e0 [ 27.412290] [] ? rw_verify_area+0x100/0x2f0 [ 27.418228] [] vfs_read+0x123/0x3a0 [ 27.423470] [] SyS_read+0xd9/0x1b0 [ 27.428627] [] ? do_sendfile+0xd30/0xd30 [ 27.434305] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 27.440777] [] entry_SYSCALL_64_fastpath+0x1c/0x98 [ 27.447330] [ 27.448927] Allocated by task 0: [ 27.452256] (stack is not available) [ 27.455931] [ 27.457526] Freed by task 0: [ 27.460507] (stack is not available) [ 27.464183] [ 27.465779] The buggy address belongs to the object at ffff8801ca6c7100 [ 27.465779] which belongs to the cache fasync_cache of size 96 [ 27.478406] The buggy address is located 64 bytes inside of [ 27.478406] 96-byte region [ffff8801ca6c7100, ffff8801ca6c7160) [ 27.490078] The buggy address belongs to the page: [ 27.506053] kasan: CONFIG_KASAN_INLINE enabled [ 27.510476] kasan: GPF could be caused by NULL-ptr deref or user memory accessgeneral protection fault: 0000 [#1] PREEMPT SMP KASAN [ 27.523398] Dumping ftrace buffer: [ 27.526923] (ftrace buffer empty) [ 27.530620] Modules linked in: [ 27.533934] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 4.4.120-gd63fdf6 #28 [ 27.540929] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 27.550273] task: ffff8801d9b49800 task.stack: ffff8801d9b58000 [ 27.556320] RIP: 0010:[] [] rb_insert_color+0x9f/0xcb0 [ 27.564937] RSP: 0018:ffff8801db307d18 EFLAGS: 00010003 [ 27.570374] RAX: 0a0508a8e82a0be9 RBX: ffffffff838a9060 RCX: ffffffff838a9060 [ 27.577639] RDX: 1ffffffff071520d RSI: ffff8801db319710 RDI: ffff8801db319c40 [ 27.584911] RBP: ffff8801db307d60 R08: ffffffff857d3748 R09: 0000000000000001 [ 27.592179] R10: 0000000000000000 R11: 1ffff1003b660f62 R12: ffff8801cb8afdf8 [ 27.599440] R13: 5028454741505f4e R14: ffff8801db319c40 R15: dffffc0000000000 [ 27.606704] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 27.614928] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 27.620806] CR2: 0000563310e3d100 CR3: 00000000b2be0000 CR4: 0000000000160670 [ 27.628075] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 27.635341] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 27.642596] Stack: [ 27.644735] ffffffff842bdb60 ffff8801d9b4a0d0 0000000000000000 ffff8801db307d70 [ 27.652781] ffff8801db319c40 dffffc0000000000 0000000000000000 ffff8801db319710 [ 27.660815] ffff8801cb8afe00 ffff8801db307db0 ffffffff81d21967 ffff8801db319c58 [ 27.668859] Call Trace: [ 27.671430] [ 27.673487] [] timerqueue_add+0x157/0x2a0 [ 27.679585] [] enqueue_hrtimer+0x168/0x450 [ 27.685459] [] __hrtimer_run_queues+0x732/0xfe0 [ 27.691776] [] ? hrtimer_fixup_init+0x70/0x70 [ 27.697912] [] ? hrtimer_interrupt+0x131/0x440 [ 27.704129] [] hrtimer_interrupt+0x1a6/0x440 [ 27.710179] [] local_apic_timer_interrupt+0x6a/0xb0 [ 27.716836] [] smp_apic_timer_interrupt+0x76/0xa0 [ 27.723318] [] apic_timer_interrupt+0xa0/0xb0 [ 27.729447] [ 27.731507] [] ? native_safe_halt+0x6/0x10 [ 27.737689] [] ? trace_hardirqs_on+0xd/0x10 [ 27.743650] [] default_idle+0x55/0x3c0 [ 27.749173] [] arch_cpu_idle+0xa/0x10 [ 27.754609] [] default_idle_call+0x48/0x70 [ 27.760482] [] cpu_startup_entry+0x5fd/0x8f0 [ 27.766528] [] ? call_cpuidle+0xe0/0xe0 [ 27.772142] [] ? clockevents_register_device+0x122/0x230 [ 27.779236] [] start_secondary+0x304/0x3e0 [ 27.785119] [] ? set_cpu_sibling_map+0x1080/0x1080 [ 27.791685] 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 [ 27.819149] RIP [] rb_insert_color+0x9f/0xcb0 [ 27.825419] RSP [ 27.829035] ---[ end trace 2d58c0e1200132a3 ]--- [ 27.833773] Kernel panic - not syncing: Fatal exception in interrupt [ 28.948253] Shutting down cpus with NMI [ 28.953242] Dumping ftrace buffer: [ 28.956756] (ftrace buffer empty) [ 28.960435] Kernel Offset: disabled [ 28.964027] Rebooting in 86400 seconds..