[....] Starting file context maintaining daemon: restorecond[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 17.293480] random: sshd: uninitialized urandom read (32 bytes read, 32 bits of entropy available) [?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 21.562581] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 21.927625] random: sshd: uninitialized urandom read (32 bytes read, 38 bits of entropy available) [ 22.806251] random: sshd: uninitialized urandom read (32 bytes read, 108 bits of entropy available) [ 22.974478] random: sshd: uninitialized urandom read (32 bytes read, 112 bits of entropy available) Warning: Permanently added '10.128.0.24' (ECDSA) to the list of known hosts. [ 28.467111] random: sshd: uninitialized urandom read (32 bytes read, 120 bits of entropy available) executing program [ 28.561653] ================================================================== [ 28.569036] BUG: KASAN: slab-out-of-bounds in sg_remove_request+0xf9/0x110 [ 28.576017] Read of size 8 at addr ffff8801d2bcf140 by task syzkaller126438/3325 [ 28.583510] [ 28.585107] CPU: 0 PID: 3325 Comm: syzkaller126438 Not tainted 4.4.111-g3301b55 #17 [ 28.592883] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 28.602202] 0000000000000000 4ce967b25dfb4350 ffff8801d003fa40 ffffffff81d0509d [ 28.610150] ffffea00074af3c0 ffff8801d2bcf140 0000000000000000 ffff8801d2bcf140 [ 28.618139] ffff8801d0e54438 ffff8801d003fa78 ffffffff814fd433 ffff8801d2bcf140 [ 28.626081] Call Trace: [ 28.628640] [] dump_stack+0xc1/0x124 [ 28.633969] [] print_address_description+0x73/0x260 [ 28.640598] [] kasan_report+0x285/0x370 [ 28.646186] [] ? sg_remove_request+0xf9/0x110 [ 28.652296] [] __asan_report_load8_noabort+0x14/0x20 [ 28.659009] [] sg_remove_request+0xf9/0x110 [ 28.664944] [] sg_finish_rem_req+0x295/0x340 [ 28.670966] [] sg_read+0xa21/0x1490 [ 28.676205] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 28.682836] [] ? __raw_spin_lock_init+0x1c/0x100 [ 28.689210] [] ? lockdep_init_map+0xeb/0x1690 [ 28.695321] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 28.701953] [] __vfs_read+0x103/0x440 [ 28.707367] [] ? vfs_iter_write+0x2d0/0x2d0 [ 28.713300] [] ? fsnotify+0x5ad/0xee0 [ 28.718712] [] ? fsnotify+0xee0/0xee0 [ 28.724143] [] ? avc_policy_seqno+0x9/0x20 [ 28.729991] [] ? selinux_file_permission+0x348/0x460 [ 28.736707] [] ? security_file_permission+0x89/0x1e0 [ 28.743423] [] ? rw_verify_area+0x100/0x2f0 [ 28.749359] [] vfs_read+0x123/0x3a0 [ 28.754604] [] SyS_read+0xd9/0x1b0 [ 28.759758] [] ? do_sendfile+0xd30/0xd30 [ 28.765433] [] ? vmacache_update+0xfe/0x130 [ 28.771369] [] ? do_fast_syscall_32+0xd7/0x890 [ 28.777563] [] ? do_sendfile+0xd30/0xd30 [ 28.783235] [] do_fast_syscall_32+0x314/0x890 [ 28.789351] [] sysenter_flags_fixed+0xd/0x17 [ 28.795379] [ 28.796974] Allocated by task 0: [ 28.800300] (stack is not available) [ 28.803975] [ 28.805567] Freed by task 0: [ 28.808544] (stack is not available) [ 28.812233] [ 28.813827] The buggy address belongs to the object at ffff8801d2bcf100 [ 28.813827] which belongs to the cache fasync_cache of size 96 [ 28.826445] The buggy address is located 64 bytes inside of [ 28.826445] 96-byte region [ffff8801d2bcf100, ffff8801d2bcf160) [ 28.838106] The buggy address belongs to the page: [ 30.356432] PANIC: double fault, error_code: 0x0 [ 30.361206] CPU: 0 PID: 3325 Comm: syzkaller126438 Not tainted 4.4.111-g3301b55 #17 [ 30.368967] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 30.378290] task: ffff8801d0e0af80 task.stack: ffff8801d0038000 [ 30.384314] RIP: 0010:[] [] dump_page_badflags+0x12/0x250 [ 30.393152] RSP: 0018:ffff880100000000 EFLAGS: 00010046 [ 30.398564] RAX: ffff8801d0e0af80 RBX: ffffea00074af3c0 RCX: ffffffff8148f980 [ 30.405802] RDX: 0000000000000000 RSI: ffffffff838a83a0 RDI: ffffea00074af3c0 [ 30.413046] RBP: ffff880100000020 R08: 0000000000000001 R09: 0000000000000000 [ 30.420281] R10: 0000000000000002 R11: fffffbfff0ad781e R12: 0000000000000000 [ 30.427520] R13: ffffffff838a83a0 R14: 0000000000000000 R15: 0000000000000000 [ 30.434762] FS: 0000000000000000(0000) GS:ffff8801db200000(0063) knlGS:000000000a01f840 [ 30.442962] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 30.448811] CR2: ffff8800fffffff8 CR3: 00000001d0e58000 CR4: 0000000000160670 [ 30.456046] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 30.463281] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 30.470519] Stack: [ 30.472634] [ 30.474223] Call Trace: [ 30.476769] [ 30.478792] Code: 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 ed ff 48 8d 7b 10 48 b8 00 00 [ 30.505445] Kernel panic - not syncing: Machine halted. [ 30.510772] CPU: 0 PID: 3325 Comm: syzkaller126438 Not tainted 4.4.111-g3301b55 #17 [ 30.518539] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 30.527862] 0000000000000000 4ce967b25dfb4350 ffff8801db20ce38 ffffffff81d0509d [ 30.535813] ffffffff838367c0 ffff8801db20cf10 ffffffff83808040 ffff880100000000 [ 30.543760] 0000000000000000 ffff8801db20cf00 ffffffff81419a3a 0000000041b58ab3 [ 30.551702] Call Trace: [ 30.554246] <#DF> [] dump_stack+0xc1/0x124 [ 30.560302] [] panic+0x1aa/0x388 [ 30.565282] [] ? percpu_up_read.constprop.45+0xe1/0xe1 [ 30.572174] [] ? vprintk_emit+0x242/0x850 [ 30.577938] [] ? dump_page_badflags+0x27/0x250 [ 30.584139] [] ? vprintk_emit+0x242/0x850 [ 30.589903] [] df_debug+0x2d/0x30 [ 30.594976] [] do_double_fault+0x10b/0x210 [ 30.600831] [] double_fault+0x2d/0x40 [ 30.606245] [] ? dump_page_badflags+0x180/0x250 [ 30.612528] [] ? dump_page_badflags+0x12/0x250 [ 30.618720] <> [ 30.622199] Dumping ftrace buffer: [ 30.626042] (ftrace buffer empty) [ 30.629726] Kernel Offset: disabled [ 30.633326] Rebooting in 86400 seconds..