[ 19.107106] random: sshd: uninitialized urandom read (32 bytes read, 32 bits of entropy available) [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting file context maintaining daemon: restorecond[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 21.042192] random: sshd: uninitialized urandom read (32 bytes read, 36 bits of entropy available) [ 21.319624] random: sshd: uninitialized urandom read (32 bytes read, 36 bits of entropy available) [ 22.252344] random: sshd: uninitialized urandom read (32 bytes read, 104 bits of entropy available) [ 22.420330] random: sshd: uninitialized urandom read (32 bytes read, 108 bits of entropy available) Warning: Permanently added '10.128.0.31' (ECDSA) to the list of known hosts. [ 27.824958] random: sshd: uninitialized urandom read (32 bytes read, 116 bits of entropy available) executing program [ 27.916242] ================================================================== [ 27.923625] BUG: KASAN: slab-out-of-bounds in sg_remove_request+0xf9/0x110 [ 27.930618] Read of size 8 at addr ffff8801d4101140 by task syzkaller281619/3666 [ 27.938121] [ 27.939723] CPU: 0 PID: 3666 Comm: syzkaller281619 Not tainted 4.4.119-g855ea74 #27 [ 27.947484] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 27.956811] 0000000000000000 d1340e2c3a9c9315 ffff8801cb637ab0 ffffffff81d0402d [ 27.964804] ffffea0007504040 ffff8801d4101140 0000000000000000 ffff8801d4101140 [ 27.972796] ffff8800afdca338 ffff8801cb637ae8 ffffffff814fe103 ffff8801d4101140 [ 27.980786] Call Trace: [ 27.983349] [] dump_stack+0xc1/0x124 [ 27.988689] [] print_address_description+0x73/0x260 [ 27.995328] [] kasan_report+0x285/0x370 [ 28.000923] [] ? sg_remove_request+0xf9/0x110 [ 28.007041] [] __asan_report_load8_noabort+0x14/0x20 [ 28.013767] [] sg_remove_request+0xf9/0x110 [ 28.019712] [] sg_finish_rem_req+0x295/0x340 [ 28.025742] [] sg_read+0xa1b/0x1490 [ 28.030992] [] ? sg_proc_seq_show_debug+0xda0/0xda0 [ 28.037629] [] ? new_slab+0x2df/0x3b0 [ 28.043053] [] ? sg_proc_seq_show_debug+0xda0/0xda0 [ 28.049693] [] __vfs_read+0x103/0x440 [ 28.055115] [] ? debug_check_no_locks_freed+0x2c0/0x2c0 [ 28.062103] [] ? vfs_iter_write+0x2d0/0x2d0 [ 28.068299] [] ? fsnotify+0x5ad/0xee0 [ 28.073721] [] ? fsnotify+0xee0/0xee0 [ 28.079143] [] ? lockdep_init_map+0xeb/0x1690 [ 28.085260] [] ? avc_policy_seqno+0x9/0x20 [ 28.091119] [] ? selinux_file_permission+0x348/0x460 [ 28.097843] [] ? security_file_permission+0x89/0x1e0 [ 28.104567] [] ? rw_verify_area+0x100/0x2f0 [ 28.110509] [] vfs_read+0x123/0x3a0 [ 28.115758] [] SyS_read+0xd9/0x1b0 [ 28.120921] [] ? do_sendfile+0xd30/0xd30 [ 28.126605] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 28.133082] [] entry_SYSCALL_64_fastpath+0x1c/0x98 [ 28.139631] [ 28.141236] Allocated by task 0: [ 28.144575] (stack is not available) [ 28.148256] [ 28.149855] Freed by task 0: [ 28.152845] (stack is not available) [ 28.156527] [ 28.158128] The buggy address belongs to the object at ffff8801d4101100 [ 28.158128] which belongs to the cache fasync_cache of size 96 [ 28.170756] The buggy address is located 64 bytes inside of [ 28.170756] 96-byte region [ffff8801d4101100, ffff8801d4101160) [ 28.182431] The buggy address belongs to the page: [ 29.371383] BUG: unable to handle kernel paging request at fffffffddf96bc00 [ 29.378817] IP: [] cpuacct_charge+0x155/0x390 [ 29.385038] PGD 420f067 PUD 0 [ 29.388516] Oops: 0000 [#1] PREEMPT SMP KASAN [ 29.393564] Dumping ftrace buffer: [ 29.397107] (ftrace buffer empty) [ 29.400815] Modules linked in: [ 29.404139] CPU: 1 PID: 3643 Comm: getty Not tainted 4.4.119-g855ea74 #27 [ 29.411055] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 29.420406] task: ffff8800b0b76000 task.stack: ffff8801cc800000 [ 29.426457] RIP: 0010:[] [] cpuacct_charge+0x155/0x390 [ 29.435099] RSP: 0018:ffff8801cc8078e0 EFLAGS: 00010046 [ 29.440548] RAX: 1ffffffff0855007 RBX: 0000000000018528 RCX: ffffffff847eb980 [ 29.447813] RDX: fffffbffbbf2d780 RSI: fffffffddf96bc00 RDI: ffffffff842a8038 [ 29.455082] RBP: ffff8801cc807928 R08: 0000000000000001 R09: 0000000000000001 [ 29.462354] R10: 0000000000000000 R11: 1ffff10039900ee8 R12: ffffffff842a7f60 [ 29.469618] R13: dffffc0000000000 R14: 0000000057453c13 R15: ffffffffcb630050 [ 29.476892] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 29.485123] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 29.491008] CR2: fffffffddf96bc00 CR3: 000000000420c000 CR4: 0000000000160670 [ 29.498283] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 29.505552] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 29.512816] Stack: [ 29.514967] ffffffff8122b480 ffff8801cc807910 0000000000000046 0000000000000003 [ 29.523055] ffff8800b0f44860 ffffffff838444e0 0000000057453c13 ffff8800b0f448b0 [ 29.531126] ffff8800b0f44800 ffff8801cc807978 ffffffff811dcc77 ffff8801db21f4c0 [ 29.539193] Call Trace: [ 29.541790] [] ? cpuacct_charge+0x60/0x390 [ 29.547674] [] update_curr+0x2c7/0x6c0 [ 29.553206] [] enqueue_task_fair+0x313/0x2940 [ 29.559341] [] activate_task+0x148/0x270 [ 29.565044] [] ttwu_do_activate.constprop.131+0xbf/0x1e0 [ 29.572135] [] try_to_wake_up+0x68d/0xf60 [ 29.577934] [] ? __lock_is_held+0xa1/0xf0 [ 29.583725] [] wake_up_state+0x10/0x20 [ 29.589275] [] signal_wake_up_state+0x44/0x70 [ 29.595415] [] complete_signal+0x2ed/0x700 [ 29.601296] [] ? __send_signal+0x53b/0x1330 [ 29.607261] [] __send_signal+0x90f/0x1330 [ 29.613050] [] ? __send_signal+0x452/0x1330 [ 29.619017] [] send_signal+0x4a/0xc0 [ 29.624375] [] do_notify_parent+0x9dc/0xd70 [ 29.630339] [] ? do_notify_parent+0x336/0xd70 [ 29.636479] [] ? send_sigqueue+0x830/0x830 [ 29.642356] [] ? do_exit+0x869/0x2a10 [ 29.647812] [] ? find_first_bit+0x8d/0xd0 [ 29.653608] [] do_exit+0x1f41/0x2a10 [ 29.658973] [] ? release_task+0x1240/0x1240 [ 29.664946] [] ? clock_was_set_work+0x30/0x30 [ 29.671085] [] ? do_nanosleep+0x1ab/0x580 [ 29.676879] [] do_group_exit+0x108/0x320 [ 29.682585] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 29.689070] [] SyS_exit_group+0x1d/0x20 [ 29.694687] [] entry_SYSCALL_64_fastpath+0x1c/0x98 [ 29.701258] Code: 49 8d bc 24 d8 00 00 00 48 89 f8 48 c1 e8 03 42 80 3c 28 00 0f 85 9e 01 00 00 49 8b 9c 24 d8 00 00 00 80 3a 00 0f 85 0a 02 00 00 <4a> 03 1c f9 48 89 d8 48 c1 e8 03 42 80 3c 28 00 0f 85 cf 01 00 [ 29.729055] RIP [] cpuacct_charge+0x155/0x390 [ 29.735344] RSP [ 29.738971] CR2: fffffffddf96bc00 [ 29.742426] ---[ end trace 5b7a272cbadb080a ]--- [ 29.747177] Kernel panic - not syncing: Fatal exception [ 29.747289] PANIC: double fault, error_code: 0x0 [ 29.747298] CPU: 0 PID: 3666 Comm: syzkaller281619 Tainted: G D 4.4.119-g855ea74 #27 [ 29.747301] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 29.747304] task: ffff8800b0f44800 task.stack: ffff8801cb630000 [ 29.747319] RIP: 0010:[] [] dump_page_badflags+0x8/0x250 [ 29.747323] RSP: 0018:ffff880100000000 EFLAGS: 00010046 [ 29.747326] RAX: ffff8800b0f44800 RBX: ffffea0007504040 RCX: ffffffff81490970 [ 29.747330] RDX: 0000000000000000 RSI: ffffffff838a9060 RDI: ffffea0007504040 [ 29.747333] RBP: ffff880100000010 R08: 0000000000000001 R09: 0000000000000000 [ 29.747336] R10: 0000000000000002 R11: fffffbfff0ad7e1e R12: 0000000000000000 [ 29.747339] R13: ffffffff838a9060 R14: 0000000000000000 R15: 0000000000000000 [ 29.747344] FS: 0000000001117880(0063) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 29.747347] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 29.747351] CR2: ffff8800fffffff8 CR3: 00000001d4484000 CR4: 0000000000160670 [ 29.747357] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 29.747361] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 29.747362] Stack: [ 29.747363] [ 29.747364] Call Trace: [ 29.747368] [ 29.747448] Code: 00 e9 83 fd ff ff e8 88 df 06 00 e9 50 fd ff ff e8 7e df 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 01 05 [ 31.007754] Shutting down cpus with NMI [ 31.012203] Dumping ftrace buffer: [ 31.015722] (ftrace buffer empty) [ 31.019406] Kernel Offset: disabled [ 31.023012] Rebooting in 86400 seconds..