[....] Starting file context maintaining daemon: restorecond[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 15.946219] 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: [ 20.514105] random: sshd: uninitialized urandom read (32 bytes read, 36 bits of entropy available) [ 20.824535] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 21.743449] random: sshd: uninitialized urandom read (32 bytes read, 109 bits of entropy available) [ 23.561173] random: sshd: uninitialized urandom read (32 bytes read, 116 bits of entropy available) Warning: Permanently added '10.128.0.36' (ECDSA) to the list of known hosts. [ 28.948713] random: sshd: uninitialized urandom read (32 bytes read, 124 bits of entropy available) executing program executing program executing program executing program executing program [ 29.084405] ================================================================== [ 29.091818] BUG: KASAN: slab-out-of-bounds in sg_remove_request+0xf9/0x110 [ 29.098800] Read of size 8 at addr ffff8801cc8f5140 by task syzkaller036179/3314 [ 29.106301] [ 29.107908] CPU: 0 PID: 3314 Comm: syzkaller036179 Not tainted 4.4.112-gca0ebb4 #29 [ 29.115680] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 29.125007] 0000000000000000 d200dab6c841491a ffff8801d088fab0 ffffffff81d056fd [ 29.132983] ffffea0007323d40 ffff8801cc8f5140 0000000000000000 ffff8801cc8f5140 [ 29.140955] ffff8801d09f4438 ffff8801d088fae8 ffffffff814fd953 ffff8801cc8f5140 [ 29.148942] Call Trace: [ 29.151506] [] dump_stack+0xc1/0x124 [ 29.156841] [] print_address_description+0x73/0x260 [ 29.163476] [] kasan_report+0x285/0x370 [ 29.169084] [] ? sg_remove_request+0xf9/0x110 [ 29.175285] [] __asan_report_load8_noabort+0x14/0x20 [ 29.182008] [] sg_remove_request+0xf9/0x110 [ 29.187963] [] sg_finish_rem_req+0x295/0x340 [ 29.193992] [] sg_read+0xa21/0x1490 [ 29.199242] [] ? do_futex+0x3e3/0x1670 [ 29.204749] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 29.211390] [] ? debug_check_no_locks_freed+0x2c0/0x2c0 [ 29.218379] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 29.225017] [] __vfs_read+0x103/0x440 [ 29.230439] [] ? trace_hardirqs_on_caller+0x38b/0x590 [ 29.237250] [] ? vfs_iter_write+0x2d0/0x2d0 [ 29.243191] [] ? fsnotify+0x5ad/0xee0 [ 29.248628] [] ? fsnotify+0xee0/0xee0 [ 29.254052] [] ? avc_policy_seqno+0x9/0x20 [ 29.259909] [] ? selinux_file_permission+0x348/0x460 [ 29.266632] [] ? security_file_permission+0x89/0x1e0 [ 29.273356] [] ? rw_verify_area+0x100/0x2f0 [ 29.279308] [] vfs_read+0x123/0x3a0 [ 29.284553] [] SyS_read+0xd9/0x1b0 [ 29.289716] [] ? do_sendfile+0xd30/0xd30 [ 29.295397] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 29.301862] [] entry_SYSCALL_64_fastpath+0x16/0x92 [ 29.308409] [ 29.310010] Allocated by task 0: [ 29.313343] (stack is not available) [ 29.317022] [ 29.318618] Freed by task 0: [ 29.321604] (stack is not available) [ 29.325282] [ 29.326881] The buggy address belongs to the object at ffff8801cc8f5100 [ 29.326881] which belongs to the cache fasync_cache of size 96 [ 29.339507] The buggy address is located 64 bytes inside of [ 29.339507] 96-byte region [ffff8801cc8f5100, ffff8801cc8f5160) [ 29.351177] The buggy address belongs to the page: [ 29.365905] kasan: CONFIG_KASAN_INLINE enabled [ 29.370333] kasan: GPF could be caused by NULL-ptr deref or user memory accessgeneral protection fault: 0000 [#1] PREEMPT SMP KASAN [ 29.383259] Dumping ftrace buffer: [ 29.386789] (ftrace buffer empty) [ 29.390487] Modules linked in: [ 29.393800] CPU: 1 PID: 3313 Comm: syzkaller036179 Not tainted 4.4.112-gca0ebb4 #29 [ 29.401582] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 29.410937] task: ffff8800b4a10000 task.stack: ffff8801d0a50000 [ 29.416987] RIP: 0010:[] [] rb_insert_color+0x9f/0xcb0 [ 29.425613] RSP: 0018:ffff8801db307d18 EFLAGS: 00010003 [ 29.431062] RAX: 0a0508a8e82a0be9 RBX: ffffffff838a8620 RCX: ffffffff838a8620 [ 29.438333] RDX: 1ffffffff07150c5 RSI: ffff8801db319710 RDI: ffff8801db319c40 [ 29.445603] RBP: ffff8801db307d60 R08: ffffffff857d1748 R09: 0000000000000001 [ 29.452873] R10: 0000000000000000 R11: 1ffff1003b660f62 R12: ffff8801d0877df8 [ 29.460137] R13: 5028454741505f4e R14: ffff8801db319c40 R15: dffffc0000000000 [ 29.467401] FS: 00007fbe6f98b700(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 29.475618] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 29.481498] CR2: 0000000020265ff7 CR3: 00000001d1722000 CR4: 0000000000160670 [ 29.488771] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 29.496060] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 29.503327] Stack: [ 29.505474] ffffffff842bcb20 ffff8800b4a10870 0000000000000001 ffff8801db307d70 [ 29.513540] ffff8801db319c40 dffffc0000000000 0000000000000000 ffff8801db319710 [ 29.521670] ffff8801d0877e00 ffff8801db307db0 ffffffff81d22fc7 ffff8801db319c58 [ 29.529714] Call Trace: [ 29.532286] [ 29.534347] [] timerqueue_add+0x157/0x2a0 [ 29.540448] [] enqueue_hrtimer+0x168/0x450 [ 29.546335] [] __hrtimer_run_queues+0x732/0xfe0 [ 29.552662] [] ? hrtimer_fixup_init+0x70/0x70 [ 29.558896] [] ? hrtimer_interrupt+0x131/0x440 [ 29.565132] [] hrtimer_interrupt+0x1a6/0x440 [ 29.571189] [] local_apic_timer_interrupt+0x6a/0xb0 [ 29.577857] [] smp_apic_timer_interrupt+0x76/0xa0 [ 29.584357] [] apic_timer_interrupt+0xa0/0xb0 [ 29.590494] [ 29.592559] [] ? smp_call_function_single+0x13e/0x3b0 [ 29.599703] [] ? smp_call_function_single+0x140/0x3b0 [ 29.606550] [] ? SyS_mmap+0x16/0x20 [ 29.611829] [] ? do_flush_tlb_all+0x30/0x30 [ 29.617801] [] ? generic_exec_single+0x330/0x330 [ 29.624206] [] ? do_flush_tlb_all+0x30/0x30 [ 29.630185] [] ? find_next_bit+0x3e/0x50 [ 29.635903] [] ? cpumask_next_and+0x92/0xc0 [ 29.641879] [] smp_call_function_many+0x481/0x710 [ 29.648722] [] ? __lock_is_held+0xa1/0xf0 [ 29.654528] [] ? do_flush_tlb_all+0x30/0x30 [ 29.660508] [] native_flush_tlb_others+0xfe/0x710 [ 29.667007] [] ? _find_next_bit.part.0+0xe0/0x120 [ 29.673503] [] ? switch_mm+0x70/0x70 [ 29.678871] [] ? cpumask_any_but+0x88/0xc0 [ 29.684759] [] flush_tlb_mm_range+0x103/0x560 [ 29.690914] [] tlb_flush_mmu_tlbonly+0x185/0x2f0 [ 29.697325] [] tlb_finish_mmu+0x1b/0xa0 [ 29.702951] [] unmap_region+0x250/0x330 [ 29.708579] [] ? __vma_link_file+0x160/0x160 [ 29.714645] [] ? vma_compute_subtree_gap+0x190/0x200 [ 29.721402] [] ? vma_rb_erase+0x60a/0x9f0 [ 29.727204] [] do_munmap+0x70f/0xec0 [ 29.732568] [] mmap_region+0x423/0x1250 [ 29.738195] [] ? selinux_mmap_addr+0x1f/0xf0 [ 29.744254] [] do_mmap+0x4fd/0x9d0 [ 29.749446] [] vm_mmap_pgoff+0x16e/0x1c0 [ 29.755167] [] ? vma_is_stack_for_task+0xa0/0xa0 [ 29.761582] [] ? SyS_futex+0x210/0x2c0 [ 29.767128] [] SyS_mmap_pgoff+0xd0/0x560 [ 29.772845] [] ? vm_stat_account+0x130/0x130 [ 29.778913] [] ? security_file_ioctl+0x89/0xb0 [ 29.785150] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 29.791653] [] SyS_mmap+0x16/0x20 [ 29.796767] [] entry_SYSCALL_64_fastpath+0x16/0x92 [ 29.803334] Code: 48 89 c2 48 c1 ea 03 42 80 3c 3a 00 0f 85 94 09 00 00 4c 8b 6b 08 4d 39 e5 0f 84 b0 01 00 00 4d 85 ed 74 1d 4c 89 e8 48 c1 e8 03 <42> 80 3c 38 00 0f 85 95 09 00 00 41 f6 45 00 01 0f 84 20 03 00 [ 29.830866] RIP [] rb_insert_color+0x9f/0xcb0 [ 29.837139] RSP [ 29.840762] ---[ end trace 13437bd5893f86f2 ]--- [ 29.845508] Kernel panic - not syncing: Fatal exception in interrupt [ 30.961607] Shutting down cpus with NMI [ 30.966716] Dumping ftrace buffer: [ 30.970238] (ftrace buffer empty) [ 30.973915] Kernel Offset: disabled [ 30.977508] Rebooting in 86400 seconds..