[ 16.470862] random: sshd: uninitialized urandom read (32 bytes read, 32 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: [ 21.769498] random: sshd: uninitialized urandom read (32 bytes read, 38 bits of entropy available) [ 22.182744] random: sshd: uninitialized urandom read (32 bytes read, 39 bits of entropy available) [ 23.055308] random: sshd: uninitialized urandom read (32 bytes read, 99 bits of entropy available) [ 23.227120] random: sshd: uninitialized urandom read (32 bytes read, 105 bits of entropy available) Warning: Permanently added '10.128.0.52' (ECDSA) to the list of known hosts. [ 28.641562] random: sshd: uninitialized urandom read (32 bytes read, 111 bits of entropy available) executing program [ 28.739430] ================================================================== [ 28.746820] BUG: KASAN: slab-out-of-bounds in sg_remove_request+0xf9/0x110 [ 28.753804] Read of size 8 at addr ffff8800b7c7a140 by task syzkaller243578/3321 [ 28.761301] [ 28.762902] CPU: 0 PID: 3321 Comm: syzkaller243578 Not tainted 4.4.111-g3301b55 #17 [ 28.770660] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 28.779985] 0000000000000000 f388bd83d2935dea ffff8801d1357a40 ffffffff81d0509d [ 28.787954] ffffea0002df1e80 ffff8800b7c7a140 0000000000000000 ffff8800b7c7a140 [ 28.795914] ffff8800b55e8238 ffff8801d1357a78 ffffffff814fd433 ffff8800b7c7a140 [ 28.803888] Call Trace: [ 28.806453] [] dump_stack+0xc1/0x124 [ 28.811784] [] print_address_description+0x73/0x260 [ 28.818424] [] kasan_report+0x285/0x370 [ 28.824018] [] ? sg_remove_request+0xf9/0x110 [ 28.830154] [] __asan_report_load8_noabort+0x14/0x20 [ 28.836879] [] sg_remove_request+0xf9/0x110 [ 28.842818] [] sg_finish_rem_req+0x295/0x340 [ 28.848849] [] sg_read+0xa21/0x1490 [ 28.854092] [] ? sg_fasync+0x8d/0xb0 [ 28.859421] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 28.866052] [] ? __lock_is_held+0xa1/0xf0 [ 28.871819] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 28.878451] [] __vfs_read+0x103/0x440 [ 28.883873] [] ? vfs_iter_write+0x2d0/0x2d0 [ 28.889810] [] ? fsnotify+0x5ad/0xee0 [ 28.895224] [] ? fsnotify+0xee0/0xee0 [ 28.900642] [] ? compat_SyS_ioctl+0x117/0x2540 [ 28.906849] [] ? avc_policy_seqno+0x9/0x20 [ 28.912713] [] ? selinux_file_permission+0x348/0x460 [ 28.919441] [] ? security_file_permission+0x89/0x1e0 [ 28.926171] [] ? rw_verify_area+0x100/0x2f0 [ 28.932115] [] vfs_read+0x123/0x3a0 [ 28.937365] [] SyS_read+0xd9/0x1b0 [ 28.942521] [] ? do_sendfile+0xd30/0xd30 [ 28.948197] [] ? do_fast_syscall_32+0xd7/0x890 [ 28.954392] [] ? do_sendfile+0xd30/0xd30 [ 28.960068] [] do_fast_syscall_32+0x314/0x890 [ 28.966197] [] sysenter_flags_fixed+0xd/0x17 [ 28.972222] [ 28.973824] Allocated by task 0: [ 28.977150] (stack is not available) [ 28.980825] [ 28.982418] Freed by task 0: [ 28.985398] (stack is not available) [ 28.989072] [ 28.990665] The buggy address belongs to the object at ffff8800b7c7a100 [ 28.990665] which belongs to the cache fasync_cache of size 96 [ 29.003294] The buggy address is located 64 bytes inside of [ 29.003294] 96-byte region [ffff8800b7c7a100, ffff8800b7c7a160) [ 29.014958] The buggy address belongs to the page: [ 29.028895] page:ffffea0002df1e80 count:1 mapcount:-2145386463 mapping: (null) index:0x0 [ 29.028902] kasan: CONFIG_KASAN_INLINE enabled [ 29.028909] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 29.028911] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 29.028915] Dumping ftrace buffer: [ 29.028918] (ftrace buffer empty) [ 29.028920] Modules linked in: [ 29.028925] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 4.4.111-g3301b55 #17 [ 29.028927] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 29.028930] task: ffff8801da3a97c0 task.stack: ffff8801da3b8000 [ 29.028940] RIP: 0010:[] [] rb_insert_color+0x1d0/0xcb0 [ 29.028943] RSP: 0018:ffff8801db307d18 EFLAGS: 00010006 [ 29.028945] RAX: ffff8801db319c40 RBX: ffffea0002df1e80 RCX: 0800000000000012 [ 29.028948] RDX: dffffc0000000000 RSI: ffff8801db319710 RDI: ffffea0002df1e90 [ 29.028950] RBP: ffff8801db307d60 R08: ffffffff857d0748 R09: 0000000000000001 [ 29.028952] R10: 0000000000000000 R11: 1ffff1003b660f62 R12: 4000000000000090 [ 29.028955] R13: 4000000000000080 R14: 4000000000000080 R15: ffff8801db319c48 [ 29.028959] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 29.028962] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 29.028965] CR2: 0000556a07519100 CR3: 00000001ccd9c000 CR4: 0000000000160670 [ 29.028971] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 29.028973] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 29.028974] Stack: [ 29.028980] ffffffff842bcb20 ffff8801da3aa030 0000000000000000 ffff8801db307d70 [ 29.028984] ffff8801db319c40 dffffc0000000000 0000000000000000 ffff8801db319710 [ 29.028988] ffff8801d0d3fe00 ffff8801db307db0 ffffffff81d22967 ffff8801db319c58 [ 29.028989] Call Trace: [ 29.028998] [ 29.028998] [] timerqueue_add+0x157/0x2a0 [ 29.029004] [] enqueue_hrtimer+0x168/0x450 [ 29.029008] [] __hrtimer_run_queues+0x732/0xfe0 [ 29.029012] [] ? hrtimer_fixup_init+0x70/0x70 [ 29.029016] [] ? hrtimer_interrupt+0x131/0x440 [ 29.029019] [] hrtimer_interrupt+0x1a6/0x440 [ 29.029025] [] local_apic_timer_interrupt+0x6a/0xb0 [ 29.029031] [] smp_apic_timer_interrupt+0x76/0xa0 [ 29.029034] [] apic_timer_interrupt+0xa0/0xb0 [ 29.029041] [ 29.029041] [] ? native_safe_halt+0x6/0x10 [ 29.029046] [] ? trace_hardirqs_on+0xd/0x10 [ 29.029052] [] default_idle+0x55/0x3c0 [ 29.029055] [] arch_cpu_idle+0xa/0x10 [ 29.029060] [] default_idle_call+0x48/0x70 [ 29.029064] [] cpu_startup_entry+0x605/0x820 [ 29.029068] [] ? call_cpuidle+0xe0/0xe0 [ 29.029073] [] ? clockevents_register_device+0x122/0x230 [ 29.029077] [] start_secondary+0x304/0x3e0 [ 29.029081] [] ? set_cpu_sibling_map+0x1040/0x1040 [ 29.029128] Code: 48 c1 e9 03 80 3c 11 00 0f 85 83 06 00 00 4d 85 ed 48 89 03 74 5b 4d 8d 65 10 48 ba 00 00 00 00 00 fc ff df 4c 89 e1 48 c1 e9 03 <80> 3c 11 00 0f 85 19 07 00 00 49 3b 5d 10 0f 84 eb 04 00 00 49 [ 29.029132] RIP [] rb_insert_color+0x1d0/0xcb0 [ 29.029133] RSP [ 29.029138] ---[ end trace 86fe05d9a345e847 ]--- [ 29.029141] Kernel panic - not syncing: Fatal exception in interrupt [ 29.360905] flags: 0xffff8801db319c40(active|reserved|private|private_2|swapcache|mappedtodisk|mlocked|uncached) [ 29.372203] page dumped because: VM_BUG_ON_PAGE(PageSlab(page)) [ 29.378249] ------------[ cut here ]------------ [ 29.382967] kernel BUG at include/linux/mm.h:460! [ 29.387770] invalid opcode: 0000 [#2] PREEMPT SMP KASAN [ 29.393553] Dumping ftrace buffer: [ 29.397056] (ftrace buffer empty) [ 29.400732] Modules linked in: [ 29.404024] CPU: 0 PID: 3321 Comm: syzkaller243578 Tainted: G D 4.4.111-g3301b55 #17 [ 29.413008] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 29.422328] task: ffff8800b4e6c740 task.stack: ffff8801d1350000 [ 29.428347] RIP: 0010:[] [] dump_page_badflags+0x191/0x250 [ 29.437271] RSP: 0018:ffff8801ce83e730 EFLAGS: 00010082 [ 29.442680] RAX: ffff8800b4e6c740 RBX: ffffea0002df1e80 RCX: ffffffff8148f96c [ 29.449917] RDX: 0000000000000000 RSI: ffffffff839fd920 RDI: ffff8800b4e6cfac [ 29.457153] RBP: ffff8801ce83e760 R08: 0000000000000001 R09: 0000000000000000 [ 29.464389] R10: 0000000000000002 R11: fffffbfff0ad7820 R12: 0000000000000000 [ 29.471623] R13: ffffffff838a83a0 R14: 0000000000000000 R15: 0000000000000000 [ 29.478860] FS: 0000000000000000(0000) GS:ffff8801db200000(0063) knlGS:0000000008fca840 [ 29.487059] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 29.492910] CR2: 0000000020b07000 CR3: 00000001ccc5a000 CR4: 0000000000160670 [ 29.500151] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 29.507393] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 29.514631] Stack: [ 29.516749] 3030303030303030 ffffea0002df1e80 0000000000000000 ffffffff838a83a0 [ 29.524700] 0000000000000000 0000000000000000 ffff8801ce83e7a0 ffffffff8148f991 [ 29.532656] 3a6666457061430a ffffea0002df1e80 0000000000000000 ffffffff838a83a0 [ 29.540605] Call Trace: [ 29.543151] [ 29.545176] Code: 46 e8 14 05 ed ff 48 83 c4 08 5b 41 5c 41 5d 41 5e 41 5f 5d c3 e8 00 05 ed ff 31 d2 48 c7 c6 a0 83 8a 83 48 89 df e8 6f fe ff ff <0f> 0b e8 d8 e0 06 00 e9 21 ff ff ff 89 4d d4 e8 cb e0 06 00 8b [ 29.571770] RIP [] dump_page_badflags+0x191/0x250 [ 29.578356] RSP [ 29.581950] ---[ end trace 86fe05d9a345e848 ]--- [ 30.091217] Shutting down cpus with NMI [ 30.095624] Dumping ftrace buffer: [ 30.099664] (ftrace buffer empty) [ 30.103344] Kernel Offset: disabled [ 30.106937] Rebooting in 86400 seconds..