[ 17.201720] random: sshd: uninitialized urandom read (32 bytes read, 34 bits of entropy available) [....] Starting file context maintaining daemon: restorecond[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 21.671100] random: sshd: uninitialized urandom read (32 bytes read, 38 bits of entropy available) [ 21.987330] random: sshd: uninitialized urandom read (32 bytes read, 39 bits of entropy available) [ 22.888512] random: sshd: uninitialized urandom read (32 bytes read, 110 bits of entropy available) [ 23.064223] random: sshd: uninitialized urandom read (32 bytes read, 114 bits of entropy available) Warning: Permanently added '10.128.0.62' (ECDSA) to the list of known hosts. [ 28.470486] random: sshd: uninitialized urandom read (32 bytes read, 123 bits of entropy available) executing program [ 28.580127] ================================================================== [ 28.587528] BUG: KASAN: slab-out-of-bounds in sg_remove_request+0xf9/0x110 [ 28.594508] Read of size 8 at addr ffff8801d52a4140 by task syzkaller241898/3332 [ 28.602003] [ 28.603623] CPU: 1 PID: 3332 Comm: syzkaller241898 Not tainted 4.4.111-gc2f631b #27 [ 28.611398] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 28.620717] 0000000000000000 9e17eea99e8a1915 ffff8801d0edfab0 ffffffff81d0513d [ 28.628685] ffffea000754a900 ffff8801d52a4140 0000000000000000 ffff8801d52a4140 [ 28.636632] ffff8801d1364438 ffff8801d0edfae8 ffffffff814fd433 ffff8801d52a4140 [ 28.644581] Call Trace: [ 28.647139] [] dump_stack+0xc1/0x124 [ 28.652473] [] print_address_description+0x73/0x260 [ 28.659103] [] kasan_report+0x285/0x370 [ 28.664694] [] ? sg_remove_request+0xf9/0x110 [ 28.670849] [] __asan_report_load8_noabort+0x14/0x20 [ 28.677570] [] sg_remove_request+0xf9/0x110 [ 28.683507] [] sg_finish_rem_req+0x295/0x340 [ 28.689529] [] sg_read+0xa21/0x1490 [ 28.694770] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 28.701418] [] ? debug_check_no_locks_freed+0x2c0/0x2c0 [ 28.708423] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 28.715065] [] __vfs_read+0x103/0x440 [ 28.720535] [] ? vfs_iter_write+0x2d0/0x2d0 [ 28.726494] [] ? fsnotify+0x5ad/0xee0 [ 28.731920] [] ? fsnotify+0xee0/0xee0 [ 28.737354] [] ? avc_policy_seqno+0x9/0x20 [ 28.743223] [] ? selinux_file_permission+0x348/0x460 [ 28.749961] [] ? security_file_permission+0x89/0x1e0 [ 28.756700] [] ? rw_verify_area+0x100/0x2f0 [ 28.762647] [] vfs_read+0x123/0x3a0 [ 28.767898] [] SyS_read+0xd9/0x1b0 [ 28.773055] [] ? do_sendfile+0xd30/0xd30 [ 28.778758] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 28.785237] [] entry_SYSCALL_64_fastpath+0x16/0x92 [ 28.791787] [ 28.793393] Allocated by task 0: [ 28.796722] (stack is not available) [ 28.800407] [ 28.801999] Freed by task 0: [ 28.804977] (stack is not available) [ 28.808651] [ 28.810244] The buggy address belongs to the object at ffff8801d52a4100 [ 28.810244] which belongs to the cache fasync_cache of size 96 [ 28.822880] The buggy address is located 64 bytes inside of [ 28.822880] 96-byte region [ffff8801d52a4100, ffff8801d52a4160) [ 28.834550] The buggy address belongs to the page: [ 30.528246] PANIC: double fault, error_code: 0x0 [ 30.533011] CPU: 1 PID: 3332 Comm: syzkaller241898 Not tainted 4.4.111-gc2f631b #27 [ 30.540774] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 30.550102] task: ffff8801d1052f80 task.stack: ffff8801d0ed8000 [ 30.556133] RIP: 0010:[] [] dump_page_badflags+0x8/0x250 [ 30.564957] RSP: 0018:ffff880100000000 EFLAGS: 00010046 [ 30.570385] RAX: ffff8801d1052f80 RBX: ffffea000754a900 RCX: ffffffff8148f980 [ 30.577638] RDX: 0000000000000000 RSI: ffffffff838a8360 RDI: ffffea000754a900 [ 30.584889] RBP: ffff880100000010 R08: 0000000000000001 R09: 0000000000000000 [ 30.592134] R10: 0000000000000002 R11: fffffbfff0ad781e R12: 0000000000000000 [ 30.599375] R13: ffffffff838a8360 R14: 0000000000000000 R15: 0000000000000000 [ 30.606624] FS: 00007f62b6bc4700(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 30.614817] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 30.620666] CR2: ffff8800fffffff8 CR3: 00000001d7b14000 CR4: 0000000000160670 [ 30.627920] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 30.635176] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 30.642421] Stack: [ 30.644549] [ 30.646150] Call Trace: [ 30.648708] [ 30.650750] 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 [ 30.677663] Kernel panic - not syncing: Machine halted. [ 30.683033] CPU: 1 PID: 3332 Comm: syzkaller241898 Not tainted 4.4.111-gc2f631b #27 [ 30.690797] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 30.700125] 0000000000000000 9e17eea99e8a1915 ffff8801db30ce38 ffffffff81d0513d [ 30.708106] ffffffff838367c0 ffff8801db30cf10 ffffffff83808040 ffff880100000000 [ 30.716081] 0000000000000000 ffff8801db30cf00 ffffffff81419a3a 0000000041b58ab3 [ 30.724031] Call Trace: [ 30.726578] <#DF> [] dump_stack+0xc1/0x124 [ 30.732635] [] panic+0x1aa/0x388 [ 30.737621] [] ? percpu_up_read.constprop.45+0xe1/0xe1 [ 30.744524] [] ? vprintk_emit+0x242/0x850 [ 30.750294] [] ? dump_page_badflags+0x1d/0x250 [ 30.756498] [] ? vprintk_emit+0x242/0x850 [ 30.762276] [] df_debug+0x2d/0x30 [ 30.767367] [] do_double_fault+0x10b/0x210 [ 30.773418] [] double_fault+0x2d/0x40 [ 30.778861] [] ? dump_page_badflags+0x180/0x250 [ 30.785167] [] ? dump_page_badflags+0x8/0x250 [ 30.791289] <> [ 30.794988] Dumping ftrace buffer: [ 30.798827] (ftrace buffer empty) [ 30.802513] Kernel Offset: disabled [ 30.806136] Rebooting in 86400 seconds..