[ 15.845116] random: sshd: uninitialized urandom read (32 bytes read, 34 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: [ 20.571583] random: sshd: uninitialized urandom read (32 bytes read, 38 bits of entropy available) [ 20.925032] random: sshd: uninitialized urandom read (32 bytes read, 39 bits of entropy available) [ 21.622370] random: sshd: uninitialized urandom read (32 bytes read, 75 bits of entropy available) [ 30.708017] random: sshd: uninitialized urandom read (32 bytes read, 85 bits of entropy available) Warning: Permanently added '10.128.0.20' (ECDSA) to the list of known hosts. [ 36.091497] random: sshd: uninitialized urandom read (32 bytes read, 91 bits of entropy available) executing program [ 36.215986] ================================================================== [ 36.223397] BUG: KASAN: slab-out-of-bounds in sg_remove_request+0xf9/0x110 [ 36.230381] Read of size 8 at addr ffff8801d14c2140 by task syzkaller053048/3321 [ 36.237881] [ 36.239482] CPU: 1 PID: 3321 Comm: syzkaller053048 Not tainted 4.4.112-g3fc4284 #32 [ 36.247243] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 36.256565] 0000000000000000 db0d97190082a907 ffff8801cd947ab0 ffffffff81d054ed [ 36.264537] ffffea0007453080 ffff8801d14c2140 0000000000000000 ffff8801d14c2140 [ 36.272507] ffff8801d13dc438 ffff8801cd947ae8 ffffffff814fd953 ffff8801d14c2140 [ 36.280476] Call Trace: [ 36.283037] [] dump_stack+0xc1/0x124 [ 36.288375] [] print_address_description+0x73/0x260 [ 36.295011] [] kasan_report+0x285/0x370 [ 36.300614] [] ? sg_remove_request+0xf9/0x110 [ 36.306738] [] __asan_report_load8_noabort+0x14/0x20 [ 36.313475] [] sg_remove_request+0xf9/0x110 [ 36.319416] [] sg_finish_rem_req+0x295/0x340 [ 36.325442] [] sg_read+0xa21/0x1490 [ 36.330688] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 36.337322] [] ? new_slab+0x2df/0x3b0 [ 36.342758] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 36.349402] [] __vfs_read+0x103/0x440 [ 36.354824] [] ? debug_check_no_locks_freed+0x2c0/0x2c0 [ 36.361807] [] ? vfs_iter_write+0x2d0/0x2d0 [ 36.367746] [] ? fsnotify+0x5ad/0xee0 [ 36.373164] [] ? fsnotify+0xee0/0xee0 [ 36.378592] [] ? lockdep_init_map+0xeb/0x1690 [ 36.384711] [] ? avc_policy_seqno+0x9/0x20 [ 36.390566] [] ? selinux_file_permission+0x348/0x460 [ 36.397285] [] ? security_file_permission+0x89/0x1e0 [ 36.404008] [] ? rw_verify_area+0x100/0x2f0 [ 36.409951] [] vfs_read+0x123/0x3a0 [ 36.415198] [] SyS_read+0xd9/0x1b0 [ 36.420356] [] ? do_sendfile+0xd30/0xd30 [ 36.426038] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 36.432499] [] entry_SYSCALL_64_fastpath+0x16/0x92 [ 36.439043] [ 36.440640] Allocated by task 0: [ 36.443975] (stack is not available) [ 36.447654] [ 36.449253] Freed by task 0: [ 36.452235] (stack is not available) [ 36.455912] [ 36.457511] The buggy address belongs to the object at ffff8801d14c2100 [ 36.457511] which belongs to the cache fasync_cache of size 96 [ 36.470134] The buggy address is located 64 bytes inside of [ 36.470134] 96-byte region [ffff8801d14c2100, ffff8801d14c2160) [ 36.481801] The buggy address belongs to the page: [ 37.950840] PANIC: double fault, error_code: 0x0 [ 37.955629] CPU: 1 PID: 3321 Comm: syzkaller053048 Not tainted 4.4.112-g3fc4284 #32 [ 37.963394] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 37.972726] task: ffff8800b4f3af80 task.stack: ffff8801cd940000 [ 37.978751] RIP: 0010:[] [] dump_page_badflags+0x8/0x250 [ 37.987509] RSP: 0018:ffff880100000000 EFLAGS: 00010046 [ 37.992925] RAX: ffff8800b4f3af80 RBX: ffffea0007453080 RCX: ffffffff8148fea0 [ 38.000165] RDX: 0000000000000000 RSI: ffffffff838a8620 RDI: ffffea0007453080 [ 38.007405] RBP: ffff880100000010 R08: 0000000000000001 R09: 0000000000000000 [ 38.014644] R10: 0000000000000002 R11: fffffbfff0ad7a1e R12: 0000000000000000 [ 38.021884] R13: ffffffff838a8620 R14: 0000000000000000 R15: 0000000000000000 [ 38.029129] FS: 000000000232f880(0063) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 38.037324] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 38.043175] CR2: ffff8800fffffff8 CR3: 00000001d7ffa000 CR4: 0000000000160670 [ 38.050419] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 38.057675] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 38.064915] Stack: [ 38.067032] [ 38.068637] Call Trace: [ 38.071188] [ 38.073215] 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 11 01 [ 38.100204] Kernel panic - not syncing: Machine halted. [ 38.106079] CPU: 1 PID: 3321 Comm: syzkaller053048 Not tainted 4.4.112-g3fc4284 #32 [ 38.113841] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 38.123164] 0000000000000000 db0d97190082a907 ffff8801db30ce38 ffffffff81d054ed [ 38.131133] ffffffff83836a60 ffff8801db30cf10 ffffffff83808040 ffff880100000000 [ 38.139105] 0000000000000000 ffff8801db30cf00 ffffffff81419dca 0000000041b58ab3 [ 38.147072] Call Trace: [ 38.149635] <#DF> [] dump_stack+0xc1/0x124 [ 38.155702] [] panic+0x1aa/0x388 [ 38.160697] [] ? percpu_up_read.constprop.45+0xe1/0xe1 [ 38.167595] [] ? vprintk_emit+0x242/0x850 [ 38.173365] [] ? dump_page_badflags+0x1d/0x250 [ 38.179564] [] ? vprintk_emit+0x242/0x850 [ 38.185332] [] df_debug+0x2d/0x30 [ 38.190407] [] do_double_fault+0x10b/0x210 [ 38.196267] [] double_fault+0x2d/0x40 [ 38.201687] [] ? dump_page_badflags+0x180/0x250 [ 38.207973] [] ? dump_page_badflags+0x8/0x250 [ 38.214084] <> [ 38.217500] Dumping ftrace buffer: [ 38.221332] (ftrace buffer empty) [ 38.225011] Kernel Offset: disabled [ 38.228623] Rebooting in 86400 seconds..