[ 19.554722] 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. [ 20.162873] random: sshd: uninitialized urandom read (32 bytes read, 32 bits of entropy available) [ 20.438566] random: sshd: uninitialized urandom read (32 bytes read, 34 bits of entropy available) Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 21.350771] random: sshd: uninitialized urandom read (32 bytes read, 91 bits of entropy available) [ 21.508445] random: sshd: uninitialized urandom read (32 bytes read, 95 bits of entropy available) Warning: Permanently added '10.128.0.19' (ECDSA) to the list of known hosts. [ 26.892623] random: sshd: uninitialized urandom read (32 bytes read, 103 bits of entropy available) executing program [ 26.988663] ================================================================== [ 26.996061] BUG: KASAN: slab-out-of-bounds in sg_remove_request+0xf9/0x110 [ 27.003044] Read of size 8 at addr ffff8801d058d140 by task syzkaller380348/3645 [ 27.010543] [ 27.012143] CPU: 1 PID: 3645 Comm: syzkaller380348 Not tainted 4.4.118-g239a415 #25 [ 27.019904] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 27.029228] 0000000000000000 21a64eca8acbab57 ffff8801cb19fab0 ffffffff81d0402d [ 27.037203] ffffea0007416340 ffff8801d058d140 0000000000000000 ffff8801d058d140 [ 27.045169] ffff8801cb968238 ffff8801cb19fae8 ffffffff814fe103 ffff8801d058d140 [ 27.053137] Call Trace: [ 27.055696] [] dump_stack+0xc1/0x124 [ 27.061032] [] print_address_description+0x73/0x260 [ 27.067663] [] kasan_report+0x285/0x370 [ 27.073256] [] ? sg_remove_request+0xf9/0x110 [ 27.079368] [] __asan_report_load8_noabort+0x14/0x20 [ 27.086089] [] sg_remove_request+0xf9/0x110 [ 27.092036] [] sg_finish_rem_req+0x295/0x340 [ 27.098084] [] sg_read+0xa1b/0x1490 [ 27.103329] [] ? new_slab+0x24f/0x3b0 [ 27.108746] [] ? sg_proc_seq_show_debug+0xda0/0xda0 [ 27.115384] [] ? __raw_spin_lock_init+0x1c/0x100 [ 27.121758] [] ? lockdep_init_map+0xeb/0x1690 [ 27.127869] [] ? sg_proc_seq_show_debug+0xda0/0xda0 [ 27.134505] [] __vfs_read+0x103/0x440 [ 27.139923] [] ? vfs_iter_write+0x2d0/0x2d0 [ 27.145862] [] ? fsnotify+0x5ad/0xee0 [ 27.151280] [] ? fsnotify+0xee0/0xee0 [ 27.156700] [] ? fasync_helper+0x7a/0xb0 [ 27.162382] [] ? avc_policy_seqno+0x9/0x20 [ 27.168236] [] ? selinux_file_permission+0x348/0x460 [ 27.174957] [] ? security_file_permission+0x89/0x1e0 [ 27.181676] [] ? rw_verify_area+0x100/0x2f0 [ 27.187619] [] vfs_read+0x123/0x3a0 [ 27.192862] [] SyS_read+0xd9/0x1b0 [ 27.198019] [] ? do_sendfile+0xd30/0xd30 [ 27.203701] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 27.210160] [] entry_SYSCALL_64_fastpath+0x1c/0x98 [ 27.216707] [ 27.218304] Allocated by task 0: [ 27.221634] (stack is not available) [ 27.225319] [ 27.226914] Freed by task 0: [ 27.229896] (stack is not available) [ 27.233572] [ 27.235171] The buggy address belongs to the object at ffff8801d058d100 [ 27.235171] which belongs to the cache fasync_cache of size 96 [ 27.247793] The buggy address is located 64 bytes inside of [ 27.247793] 96-byte region [ffff8801d058d100, ffff8801d058d160) [ 27.259457] The buggy address belongs to the page: [ 28.662496] PANIC: double fault, error_code: 0x0 [ 28.667279] CPU: 1 PID: 3645 Comm: syzkaller380348 Not tainted 4.4.118-g239a415 #25 [ 28.675038] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 28.684362] task: ffff8801cd95b000 task.stack: ffff8801cb198000 [ 28.690385] RIP: 0010:[] [] dump_page_badflags+0x8/0x250 [ 28.699146] RSP: 0018:ffff880100000000 EFLAGS: 00010046 [ 28.704561] RAX: ffff8801cd95b000 RBX: ffffea0007416340 RCX: ffffffff81490970 [ 28.711802] RDX: 0000000000000000 RSI: ffffffff838a9060 RDI: ffffea0007416340 [ 28.719041] RBP: ffff880100000010 R08: 0000000000000001 R09: 0000000000000000 [ 28.726280] R10: 0000000000000002 R11: fffffbfff0ad7e1e R12: 0000000000000000 [ 28.733518] R13: ffffffff838a9060 R14: 0000000000000000 R15: 0000000000000000 [ 28.740758] FS: 0000000002623880(0063) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 28.748959] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 28.754809] CR2: ffff8800fffffff8 CR3: 00000001d0eae000 CR4: 0000000000160670 [ 28.762058] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 28.769304] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 28.776541] Stack: [ 28.778658] [ 28.780253] Call Trace: [ 28.782804] [ 28.784833] 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 [ 28.811819] Kernel panic - not syncing: Machine halted. [ 28.817151] CPU: 1 PID: 3645 Comm: syzkaller380348 Not tainted 4.4.118-g239a415 #25 [ 28.824909] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 28.834229] 0000000000000000 21a64eca8acbab57 ffff8801db30ce38 ffffffff81d0402d [ 28.842210] ffffffff838373a0 ffff8801db30cf10 ffffffff83808040 ffff880100000000 [ 28.850172] 0000000000000000 ffff8801db30cf00 ffffffff8141aaea 0000000041b58ab3 [ 28.858135] Call Trace: [ 28.860683] <#DF> [] dump_stack+0xc1/0x124 [ 28.866757] [] panic+0x1aa/0x388 [ 28.871754] [] ? percpu_up_read.constprop.45+0xe1/0xe1 [ 28.878649] [] ? vprintk_emit+0x242/0x850 [ 28.884424] [] ? dump_page_badflags+0x1d/0x250 [ 28.890621] [] ? vprintk_emit+0x242/0x850 [ 28.896387] [] df_debug+0x2d/0x30 [ 28.901460] [] do_double_fault+0x10b/0x210 [ 28.907314] [] double_fault+0x2d/0x40 [ 28.912740] [] ? dump_page_badflags+0x180/0x250 [ 28.919027] [] ? dump_page_badflags+0x8/0x250 [ 28.925136] <> [ 28.928577] Dumping ftrace buffer: [ 28.932423] (ftrace buffer empty) [ 28.936103] Kernel Offset: disabled [ 28.939706] Rebooting in 86400 seconds..