[ 15.748388] random: sshd: uninitialized urandom read (32 bytes read, 33 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: [ 21.961602] random: sshd: uninitialized urandom read (32 bytes read, 39 bits of entropy available) [ 22.178692] random: sshd: uninitialized urandom read (32 bytes read, 39 bits of entropy available) [ 22.934835] random: sshd: uninitialized urandom read (32 bytes read, 87 bits of entropy available) [ 36.506657] random: sshd: uninitialized urandom read (32 bytes read, 98 bits of entropy available) Warning: Permanently added '10.128.15.214' (ECDSA) to the list of known hosts. [ 46.081626] random: sshd: uninitialized urandom read (32 bytes read, 107 bits of entropy available) executing program executing program [ 46.187829] ================================================================== [ 46.195250] BUG: KASAN: slab-out-of-bounds in sg_remove_request+0xf9/0x110 [ 46.202233] Read of size 8 at addr ffff8800b3ccb140 by task syzkaller255751/3333 [ 46.209732] [ 46.211330] CPU: 1 PID: 3333 Comm: syzkaller255751 Not tainted 4.4.111-g3301b55 #24 [ 46.219089] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 46.228411] 0000000000000000 10fd50b1cec4b742 ffff8801d03f7ab0 ffffffff81d0509d [ 46.236364] ffffea0002cf32c0 ffff8800b3ccb140 0000000000000000 ffff8800b3ccb140 [ 46.244321] ffff8800b8320238 ffff8801d03f7ae8 ffffffff814fd433 ffff8800b3ccb140 [ 46.252271] Call Trace: [ 46.254839] [] dump_stack+0xc1/0x124 [ 46.260173] [] print_address_description+0x73/0x260 [ 46.266803] [] kasan_report+0x285/0x370 [ 46.272404] [] ? sg_remove_request+0xf9/0x110 [ 46.278524] [] __asan_report_load8_noabort+0x14/0x20 [ 46.285258] [] sg_remove_request+0xf9/0x110 [ 46.291196] [] sg_finish_rem_req+0x295/0x340 [ 46.297219] [] sg_read+0xa21/0x1490 [ 46.302467] [] ? do_futex+0x3e3/0x1670 [ 46.307970] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 46.314611] [] ? debug_check_no_locks_freed+0x2c0/0x2c0 [ 46.321593] [] ? lockdep_init_map+0xeb/0x1690 [ 46.327704] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 46.334338] [] __vfs_read+0x103/0x440 [ 46.339755] [] ? vfs_iter_write+0x2d0/0x2d0 [ 46.345702] [] ? fsnotify+0x5ad/0xee0 [ 46.351126] [] ? fsnotify+0xee0/0xee0 [ 46.356545] [] ? avc_policy_seqno+0x9/0x20 [ 46.362398] [] ? selinux_file_permission+0x348/0x460 [ 46.369120] [] ? security_file_permission+0x89/0x1e0 [ 46.375841] [] ? rw_verify_area+0x100/0x2f0 [ 46.381779] [] vfs_read+0x123/0x3a0 [ 46.387028] [] SyS_read+0xd9/0x1b0 [ 46.392184] [] ? do_sendfile+0xd30/0xd30 [ 46.397870] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 46.404332] [] entry_SYSCALL_64_fastpath+0x16/0x92 [ 46.410877] [ 46.412470] Allocated by task 0: [ 46.415797] (stack is not available) [ 46.419473] [ 46.421065] Freed by task 0: [ 46.424053] (stack is not available) [ 46.427728] [ 46.429324] The buggy address belongs to the object at ffff8800b3ccb100 [ 46.429324] which belongs to the cache fasync_cache of size 96 [ 46.441951] The buggy address is located 64 bytes inside of [ 46.441951] 96-byte region [ffff8800b3ccb100, ffff8800b3ccb160) [ 46.453616] The buggy address belongs to the page: [ 47.878324] PANIC: double fault, error_code: 0x0 [ 47.883104] CPU: 1 PID: 3333 Comm: Not tainted 4.4.111-g3301b55 #24 [ 47.890188] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 47.899513] task: ffff8801d0124740 task.stack: (null) [ 47.905537] RIP: 0010:[] [] dump_page_badflags+0x8/0x250 [ 47.914295] RSP: 0018:ffff880100000000 EFLAGS: 00010046 [ 47.919711] RAX: ffff8801d0124740 RBX: ffffea0002cf32c0 RCX: ffffffff8148f980 [ 47.926945] RDX: 0000000000000000 RSI: ffffffff838a83a0 RDI: ffffea0002cf32c0 [ 47.934183] RBP: ffff880100000010 R08: 0000000000000001 R09: 0000000000000000 [ 47.941419] R10: 0000000000000002 R11: fffffbfff0ad781e R12: 0000000000000000 [ 47.948665] R13: ffffffff838a83a0 R14: 0000000000000000 R15: 0000000000000000 [ 47.956598] FS: 00007fc064a44700(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 47.964791] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 47.970640] CR2: ffff8800fffffff8 CR3: 00000000b49d2000 CR4: 0000000000160670 [ 47.977883] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 47.985119] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 47.992356] Stack: [ 47.994471] [ 47.996063] Call Trace: [ 47.998613] [ 48.000640] 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 [ 48.027234] Kernel panic - not syncing: Machine halted. [ 48.032571] CPU: 1 PID: 3333 Comm: Not tainted 4.4.111-g3301b55 #24 [ 48.039113] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 48.048437] 0000000000000000 10fd50b1cec4b742 ffff8801db30ce38 ffffffff81d0509d [ 48.056396] ffffffff838367c0 ffff8801db30cf10 ffffffff83808040 ffff880100000000 [ 48.064367] 0000000000000000 ffff8801db30cf00 ffffffff81419a3a 0000000041b58ab3 [ 48.072315] Call Trace: [ 48.074861] <#DF> [] dump_stack+0xc1/0x124 [ 48.080934] [] panic+0x1aa/0x388 [ 48.085919] [] ? percpu_up_read.constprop.45+0xe1/0xe1 [ 48.092832] [] ? vprintk_emit+0x242/0x850 [ 48.098600] [] ? dump_page_badflags+0x1d/0x250 [ 48.104809] [] ? vprintk_emit+0x242/0x850 [ 48.110576] [] df_debug+0x2d/0x30 [ 48.115647] [] do_double_fault+0x10b/0x210 [ 48.121512] [] double_fault+0x2d/0x40 [ 48.126937] [] ? dump_page_badflags+0x180/0x250 [ 48.134615] [] ? dump_page_badflags+0x8/0x250 [ 48.140725] <> [ 48.144053] Dumping ftrace buffer: [ 48.147843] (ftrace buffer empty) [ 48.151522] Kernel Offset: disabled [ 48.155119] Rebooting in 86400 seconds..