[....] Starting file context maintaining daemon: restorecond[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 16.987912] random: sshd: uninitialized urandom read (32 bytes read, 33 bits of entropy available) [?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 28.275574] random: sshd: uninitialized urandom read (32 bytes read, 41 bits of entropy available) [ 28.892409] random: sshd: uninitialized urandom read (32 bytes read, 41 bits of entropy available) [ 29.658750] random: sshd: uninitialized urandom read (32 bytes read, 109 bits of entropy available) [ 29.841192] random: sshd: uninitialized urandom read (32 bytes read, 115 bits of entropy available) Warning: Permanently added '10.128.15.234' (ECDSA) to the list of known hosts. [ 35.221660] random: sshd: uninitialized urandom read (32 bytes read, 125 bits of entropy available) executing program executing program executing program [ 35.327795] ================================================================== [ 35.335244] BUG: KASAN: slab-out-of-bounds in sg_remove_request+0xf9/0x110 [ 35.342229] Read of size 8 at addr ffff8801d0b5f140 by task syzkaller371390/3324 [ 35.349732] [ 35.351341] CPU: 1 PID: 3324 Comm: syzkaller371390 Not tainted 4.4.112-g3fc4284 #32 [ 35.359105] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 35.368433] 0000000000000000 3cb514df2b0ba90a ffff8801cfcf7ab0 ffffffff81d054ed [ 35.376504] ffffea000742d7c0 ffff8801d0b5f140 0000000000000000 ffff8801d0b5f140 [ 35.384479] ffff8800b3d34438 ffff8801cfcf7ae8 ffffffff814fd953 ffff8801d0b5f140 [ 35.392457] Call Trace: [ 35.395023] [] dump_stack+0xc1/0x124 [ 35.400363] [] print_address_description+0x73/0x260 [ 35.407000] [] kasan_report+0x285/0x370 [ 35.412614] [] ? sg_remove_request+0xf9/0x110 [ 35.418733] [] __asan_report_load8_noabort+0x14/0x20 [ 35.425459] [] sg_remove_request+0xf9/0x110 [ 35.431402] [] sg_finish_rem_req+0x295/0x340 [ 35.437447] [] sg_read+0xa21/0x1490 [ 35.442697] [] ? do_futex+0x3e3/0x1670 [ 35.448206] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 35.454844] [] ? debug_check_no_locks_freed+0x2c0/0x2c0 [ 35.461828] [] ? lockdep_init_map+0xeb/0x1690 [ 35.467950] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 35.474612] [] __vfs_read+0x103/0x440 [ 35.480034] [] ? vfs_iter_write+0x2d0/0x2d0 [ 35.485995] [] ? fsnotify+0x5ad/0xee0 [ 35.491417] [] ? fsnotify+0xee0/0xee0 [ 35.496840] [] ? avc_policy_seqno+0x9/0x20 [ 35.502697] [] ? selinux_file_permission+0x348/0x460 [ 35.509421] [] ? security_file_permission+0x89/0x1e0 [ 35.516148] [] ? rw_verify_area+0x100/0x2f0 [ 35.522094] [] vfs_read+0x123/0x3a0 [ 35.527341] [] SyS_read+0xd9/0x1b0 [ 35.532503] [] ? do_sendfile+0xd30/0xd30 [ 35.538188] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 35.544653] [] entry_SYSCALL_64_fastpath+0x16/0x92 [ 35.551202] [ 35.552803] Allocated by task 0: [ 35.556137] (stack is not available) [ 35.559818] [ 35.561416] Freed by task 0: [ 35.564403] (stack is not available) [ 35.568084] [ 35.569689] The buggy address belongs to the object at ffff8801d0b5f100 [ 35.569689] which belongs to the cache fasync_cache of size 96 [ 35.582320] The buggy address is located 64 bytes inside of [ 35.582320] 96-byte region [ffff8801d0b5f100, ffff8801d0b5f160) [ 35.594081] The buggy address belongs to the page: [ 37.329938] PANIC: double fault, error_code: 0x0 [ 37.334728] CPU: 1 PID: 3324 Comm: syzkaller371390 Not tainted 4.4.112-g3fc4284 #32 [ 37.342494] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 37.351821] task: ffff8801d0eaaf80 task.stack: ffff8801cfcf0000 [ 37.357848] RIP: 0010:[] [] dump_page_badflags+0x8/0x250 [ 37.366632] RSP: 0018:ffff880100000000 EFLAGS: 00010046 [ 37.372055] RAX: ffff8801d0eaaf80 RBX: ffffea000742d7c0 RCX: ffffffff8148fea0 [ 37.379301] RDX: 0000000000000000 RSI: ffffffff838a8620 RDI: ffffea000742d7c0 [ 37.386545] RBP: ffff880100000010 R08: 0000000000000001 R09: 0000000000000000 [ 37.393815] R10: 0000000000000002 R11: fffffbfff0ad7a1e R12: 0000000000000000 [ 37.401059] R13: ffffffff838a8620 R14: 0000000000000000 R15: 0000000000000000 [ 37.408307] FS: 00007f18e39e7700(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 37.416506] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 37.422362] CR2: ffff8800fffffff8 CR3: 00000000b4a8a000 CR4: 0000000000160670 [ 37.429608] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 37.436852] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 37.444093] Stack: [ 37.446213] [ 37.447811] Call Trace: [ 37.450364] [ 37.452395] 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 [ 37.479613] Kernel panic - not syncing: Machine halted. [ 37.484955] CPU: 1 PID: 3324 Comm: syzkaller371390 Not tainted 4.4.112-g3fc4284 #32 [ 37.492720] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 37.502047] 0000000000000000 3cb514df2b0ba90a ffff8801db30ce38 ffffffff81d054ed [ 37.510029] ffffffff83836a60 ffff8801db30cf10 ffffffff83808040 ffff880100000000 [ 37.518007] 0000000000000000 ffff8801db30cf00 ffffffff81419dca 0000000041b58ab3 [ 37.525987] Call Trace: [ 37.528540] <#DF> [] dump_stack+0xc1/0x124 [ 37.534614] [] panic+0x1aa/0x388 [ 37.539620] [] ? percpu_up_read.constprop.45+0xe1/0xe1 [ 37.546538] [] ? vprintk_emit+0x242/0x850 [ 37.552308] [] ? dump_page_badflags+0x1d/0x250 [ 37.558516] [] ? vprintk_emit+0x242/0x850 [ 37.564286] [] df_debug+0x2d/0x30 [ 37.569364] [] do_double_fault+0x10b/0x210 [ 37.575225] [] double_fault+0x2d/0x40 [ 37.580651] [] ? dump_page_badflags+0x180/0x250 [ 37.586943] [] ? dump_page_badflags+0x8/0x250 [ 37.593056] <> [ 37.596539] Dumping ftrace buffer: [ 37.600407] (ftrace buffer empty) [ 37.604099] Kernel Offset: disabled [ 37.607705] Rebooting in 86400 seconds..