[ 16.532818] random: sshd: uninitialized urandom read (32 bytes read, 33 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: [ 20.115675] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 20.379272] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 21.323211] random: sshd: uninitialized urandom read (32 bytes read, 111 bits of entropy available) [ 21.501064] random: sshd: uninitialized urandom read (32 bytes read, 117 bits of entropy available) Warning: Permanently added '10.128.0.19' (ECDSA) to the list of known hosts. [ 26.917000] random: sshd: uninitialized urandom read (32 bytes read, 123 bits of entropy available) executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 27.572486] random: nonblocking pool is initialized executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 30.263938] ================================================================== [ 30.271362] BUG: KASAN: out-of-bounds in sg_remove_request+0xf9/0x110 [ 30.277935] Read of size 8 at addr ffff8800b2e1a240 by task syzkaller935857/5412 [ 30.285457] [ 30.287074] CPU: 1 PID: 5412 Comm: syzkaller935857 Not tainted 4.4.113-g202e079 #1 [ 30.294765] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 30.304111] 0000000000000000 319e2360fd73a9a7 ffff8800b2737ab0 ffffffff81d0278d executing program [ 30.312144] ffffea0002cb8680 ffff8800b2e1a240 0000000000000000 ffff8800b2e1a248 [ 30.320191] ffff8800b2792338 ffff8800b2737ae8 ffffffff814fd053 ffff8800b2e1a240 [ 30.328236] Call Trace: [ 30.330816] [] dump_stack+0xc1/0x124 [ 30.336175] [] print_address_description+0x73/0x260 [ 30.342837] [] kasan_report+0x285/0x370 [ 30.348457] [] ? sg_remove_request+0xf9/0x110 [ 30.354608] [] __asan_report_load8_noabort+0x14/0x20 [ 30.361358] [] sg_remove_request+0xf9/0x110 [ 30.367325] [] sg_finish_rem_req+0x295/0x340 [ 30.373376] [] sg_read+0xa1b/0x1490 [ 30.378735] [] ? sg_proc_seq_show_debug+0xda0/0xda0 [ 30.385401] [] ? debug_check_no_locks_freed+0x2c0/0x2c0 [ 30.392411] [] ? sg_proc_seq_show_debug+0xda0/0xda0 [ 30.399073] [] __vfs_read+0x103/0x440 [ 30.404523] [] ? vfs_iter_write+0x2d0/0x2d0 [ 30.410491] [] ? fsnotify+0x5ad/0xee0 [ 30.415932] [] ? fsnotify+0xee0/0xee0 [ 30.421379] [] ? avc_policy_seqno+0x9/0x20 [ 30.427280] [] ? selinux_file_permission+0x348/0x460 [ 30.434035] [] ? security_file_permission+0x89/0x1e0 [ 30.440783] [] ? rw_verify_area+0x100/0x2f0 [ 30.446758] [] vfs_read+0x123/0x3a0 [ 30.452048] [] SyS_read+0xd9/0x1b0 [ 30.457233] [] ? do_sendfile+0xd30/0xd30 [ 30.462936] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 30.469427] [] entry_SYSCALL_64_fastpath+0x1c/0x98 [ 30.475991] [ 30.477628] Allocated by task 5428: [ 30.481242] [] save_stack_trace+0x26/0x50 [ 30.487169] [] save_stack+0x43/0xd0 [ 30.492565] [] kasan_kmalloc+0xad/0xe0 [ 30.498253] [] kasan_slab_alloc+0x12/0x20 [ 30.504173] [] kmem_cache_alloc+0xba/0x290 [ 30.510199] [] fasync_helper+0x37/0xb0 [ 30.515855] [] sg_fasync+0x86/0xb0 [ 30.521161] [] SyS_fcntl+0x64f/0xc40 [ 30.526644] [] entry_SYSCALL_64_fastpath+0x1c/0x98 [ 30.533361] [ 30.534999] Freed by task 0: [ 30.537997] (stack is not available) [ 30.541689] [ 30.543305] The buggy address belongs to the object at ffff8800b2e1a200 [ 30.543305] which belongs to the cache fasync_cache of size 96 [ 30.555956] The buggy address is located 64 bytes inside of [ 30.555956] 96-byte region [ffff8800b2e1a200, ffff8800b2e1a260) [ 30.567650] The buggy address belongs to the page: [ 30.572915] BUG: spinlock bad magic on CPU#0, syzkaller935857/5539 [ 30.579319] lock: 0xffff8800b26fb180, .magic: 00000000, .owner: HXo/0, .owner_cpu: 0 [ 30.588128] CPU: 0 PID: 5539 Comm: syzkaller935857 Not tainted 4.4.113-g202e079 #1 [ 30.595830] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 30.605190] 0000000000000000 8c40b882d3a3a464 ffff8800b2817d30 ffffffff81d0278d [ 30.613261] ffff8800b26fb180 ffff8800b26fb1d0 ffff8800b2808000 1ffff10016502fd3 [ 30.621324] 0000000000000000 ffff8800b2817d70 ffffffff81245a5d ffffea0000000000 [ 30.629395] Call Trace: [ 30.631979] [] dump_stack+0xc1/0x124 [ 30.637340] [] spin_dump+0x14d/0x280 [ 30.642707] [] do_raw_spin_lock+0x228/0x2c0 [ 30.648681] [] _raw_spin_lock+0x3e/0x50 [ 30.654315] [] ? __alloc_fd+0x35/0x500 [ 30.659858] [] __alloc_fd+0x35/0x500 [ 30.665225] [] ? getname_flags+0x256/0x580 [ 30.671114] [] get_unused_fd_flags+0x9e/0xd0 [ 30.677177] [] do_sys_open+0x221/0x4b0 [ 30.682724] [] ? filp_open+0x70/0x70 [ 30.688102] [] ? trace_hardirqs_on_caller+0x38b/0x590 [ 30.694944] [] SyS_open+0x2d/0x40 [ 30.700054] [] entry_SYSCALL_64_fastpath+0x1c/0x98 [ 30.706696] kasan: CONFIG_KASAN_INLINE enabled [ 30.711133] kasan: GPF could be caused by NULL-ptr deref or user memory accessgeneral protection fault: 0000 [#1] PREEMPT SMP KASAN [ 30.724112] Dumping ftrace buffer: [ 30.727639] (ftrace buffer empty) [ 30.731342] Modules linked in: [ 30.734664] CPU: 0 PID: 5539 Comm: syzkaller935857 Not tainted 4.4.113-g202e079 #1 [ 30.742365] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 30.751723] task: ffff8800b2808000 task.stack: ffff8800b2810000 [ 30.757776] RIP: 0010:[] [] _find_next_bit.part.0+0x3e/0x120 [ 30.766952] RSP: 0018:ffff8800b2817d70 EFLAGS: 00010202 [ 30.772394] RAX: dffffc0000000000 RBX: 00000000020e2a37 RCX: ffffffff81d46c42 [ 30.779660] RDX: 00000000000838a8 RSI: 0000000002c9bec6 RDI: 0000000000000000 [ 30.786931] RBP: ffff8800b2817da0 R08: 0000000000000001 R09: 0000000000000000 [ 30.794200] R10: 0000000000000002 R11: fffffbfff0ad7e28 R12: 0000000002c9bec6 [ 30.801470] R13: ffffffffffffffff R14: 0000000000000000 R15: 000000000041c540 [ 30.808741] FS: 00007f603d119700(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 30.816962] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 30.822842] CR2: 0000000020bbdff7 CR3: 00000000b293a000 CR4: 0000000000160670 [ 30.830113] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 30.837385] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 30.844647] Stack: [ 30.846790] ffff8800b2817da8 0000000002c9bec6 00000000020e2a37 0000000000000000 [ 30.854858] ffff8800b26fb150 0000000000000000 ffff8800b2817dc8 ffffffff81d46dcb [ 30.862906] 00000000b26fb190 00000000838a8de0 ffff8800b26fb0c0 ffff8800b2817e40 [ 30.870944] Call Trace: [ 30.873530] [] find_next_zero_bit+0x3b/0x50 [ 30.879502] [] __alloc_fd+0x16e/0x500 [ 30.884967] [] get_unused_fd_flags+0x9e/0xd0 [ 30.891034] [] do_sys_open+0x221/0x4b0 [ 30.896586] [] ? filp_open+0x70/0x70 [ 30.901953] [] ? trace_hardirqs_on_caller+0x38b/0x590 [ 30.908801] [] SyS_open+0x2d/0x40 [ 30.913915] [] entry_SYSCALL_64_fastpath+0x1c/0x98 [ 30.920486] Code: 89 f4 53 48 89 d3 48 83 ec 08 e8 de 8f 61 ff 48 89 d8 48 c1 e8 06 4d 8d 3c c6 48 b8 00 00 00 00 00 fc ff df 4c 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 bc 00 00 00 49 8b 07 89 d9 48 83 e3 c0 4c 31 [ 30.948082] RIP [] _find_next_bit.part.0+0x3e/0x120 [ 30.954879] RSP [ 30.958549] ---[ end trace 065fdc87d11b217d ]--- [ 30.963302] Kernel panic - not syncing: Fatal exception [ 32.106543] Shutting down cpus with NMI [ 32.111212] Dumping ftrace buffer: [ 32.114730] (ftrace buffer empty) [ 32.118407] Kernel Offset: disabled [ 32.122008] Rebooting in 86400 seconds..