[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 15.756341] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 28.026777] random: sshd: uninitialized urandom read (32 bytes read) [ 28.478802] random: sshd: uninitialized urandom read (32 bytes read) [ 29.122636] random: sshd: uninitialized urandom read (32 bytes read) [ 111.496909] random: sshd: uninitialized urandom read (32 bytes read) INIT: Id "3" respawning too fast: disabled for 5 minutes INIT: Id "6" respawning too fast: disabled for 5 minutes INIT: Id "2" respawning too fast: disabled for 5 minutes INIT: Id "5" respawning too fast: disabled for 5 minutes INIT: Id "1" respawning too fast: disabled for 5 minutes INIT: Id "4" respawning too fast: disabled for 5 minutes Warning: Permanently added '10.128.0.53' (ECDSA) to the list of known hosts. [ 116.973331] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 117.058982] IPVS: Creating netns size=2536 id=1 executing program executing program [ 117.269891] hrtimer: interrupt took 36844 ns executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 151.343538] random: crng init done executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 163.204492] kasan: CONFIG_KASAN_INLINE enabled [ 163.209104] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 163.216545] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 163.222757] Dumping ftrace buffer: [ 163.226268] (ftrace buffer empty) [ 163.229951] Modules linked in: [ 163.233239] CPU: 0 PID: 5030 Comm: syz-executor920 Not tainted 4.9.112-gf540ce0 #8 [ 163.240920] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 163.250337] task: ffff8801cdc81800 task.stack: ffff8801cba40000 [ 163.256365] RIP: 0010:[] [] perf_output_read+0x62d/0x12e0 [ 163.265248] RSP: 0018:ffff8801cba46ff0 EFLAGS: 00010207 [ 163.270675] RAX: 000000000000001b RBX: 0000000000000004 RCX: 0000000000000000 [ 163.277916] RDX: 0000000000000000 RSI: ffffffff813fd60f RDI: 00000000000000dc [ 163.285158] RBP: ffff8801cba47150 R08: ffffed0039df7b0b R09: ffffed0039df7b0a [ 163.292401] R10: ffffed0039df7b0a R11: ffff8801cefbd857 R12: ffff8801cb296148 [ 163.299644] R13: ffff8801cba47318 R14: dffffc0000000000 R15: ffff8801cb2960d0 [ 163.306888] FS: 00007fc7625ba700(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 163.315186] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 163.321040] CR2: 0000000100000001 CR3: 00000001cf28b000 CR4: 00000000001606f0 [ 163.328286] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 163.336138] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 163.343390] Stack: [ 163.345518] ffff8801cdab8f1c 00000000000038c8 ffff8801cba47320 ffffed0039748e64 [ 163.353508] 0000000000000008 0000000000000000 ffff8801ce0d3300 ffffed0039748e67 [ 163.361500] 1ffff10039748e0d ffff8801ce0d2aa0 ffff8801cba47338 ffff8801cba47330 [ 163.369477] Call Trace: [ 163.372041] [] ? perf_mmap_fault+0x570/0x570 [ 163.378085] [] ? retint_kernel+0x2d/0x2d [ 163.383767] [] ? perf_output_copy+0x15e/0x1e0 [ 163.389883] [] perf_output_sample+0xedb/0x1770 [ 163.396087] [] ? perf_event__output_id_sample+0x80/0x80 [ 163.403071] [] ? perf_callchain+0x158/0x1a0 [ 163.409016] [] perf_event_output_forward+0x126/0x230 [ 163.415767] [] ? perf_prepare_sample+0xf40/0xf40 [ 163.422157] [] ? perf_prepare_sample+0xf40/0xf40 [ 163.428543] [] ? ext4_es_insert_extent+0x227/0x5a0 [ 163.435103] [] ? __this_cpu_preempt_check+0x1c/0x20 [ 163.441749] [] __perf_event_overflow+0x11f/0x320 [ 163.448131] [] perf_swevent_overflow+0x161/0x1f0 [ 163.454510] [] perf_swevent_event+0x115/0x270 [ 163.460628] [] perf_tp_event+0x234/0x660 [ 163.466313] [] ? pagecache_get_page+0x131/0x720 [ 163.472604] [] ? perf_swevent_put_recursion_context+0xa0/0xa0 [ 163.480113] [] ? __find_get_block_slow+0x263/0x330 [ 163.486664] [] ? __might_sleep+0x95/0x1a0 [ 163.492449] [] ? unmap_underlying_metadata+0x88/0x100 [ 163.499259] [] ? ext4_da_write_end+0x7a9/0xbf0 [ 163.505462] [] ? ext4_inode_attach_jinode.part.74+0x150/0x150 [ 163.512968] [] ? __breadahead+0xf0/0xf0 [ 163.518563] [] ? ext4_inode_attach_jinode.part.74+0x150/0x150 [ 163.526071] [] ? __block_write_begin+0x30/0x40 [ 163.532276] [] ? check_preemption_disabled+0x3b/0x170 [ 163.539086] [] ? ext4_da_write_begin+0x586/0x1020 [ 163.545549] [] ? check_preemption_disabled+0x3b/0x170 [ 163.552364] [] perf_trace_run_bpf_submit+0xec/0x140 [ 163.559004] [] perf_trace_android_fs_data_end_template+0x2f4/0x4a0 [ 163.566943] [] ? __blockdev_direct_IO+0xd0/0xd0 [ 163.573251] [] ? __lock_is_held+0xa2/0xf0 [ 163.579021] [] ? __blockdev_direct_IO+0xd0/0xd0 [ 163.585355] [] ext4_da_write_end+0x7a9/0xbf0 [ 163.591396] [] generic_perform_write+0x3b9/0x510 [ 163.597785] [] ? page_endio+0x180/0x180 [ 163.603387] [] ? file_update_time+0xbc/0x390 [ 163.609420] [] ? current_time+0xd0/0xd0 [ 163.615018] [] __generic_file_write_iter+0x352/0x540 [ 163.621744] [] ? generic_write_checks+0x245/0x410 [ 163.628212] [] ext4_file_write_iter+0x463/0xd90 [ 163.634503] [] ? mark_held_locks+0xc7/0x130 [ 163.640448] [] ? ext4_file_open+0x920/0x920 [ 163.646397] [] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 163.652949] [] ? check_preemption_disabled+0x3b/0x170 [ 163.660818] [] ? iov_iter_init+0xaf/0x1d0 [ 163.666587] [] __vfs_write+0x3e0/0x580 [ 163.672098] [] ? mark_held_locks+0xc7/0x130 [ 163.678040] [] ? default_llseek+0x280/0x280 [ 163.683992] [] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 163.690544] [] ? check_preemption_disabled+0x3b/0x170 [ 163.697365] [] ? retint_kernel+0x2d/0x2d [ 163.703050] [] vfs_write+0x187/0x530 [ 163.708384] [] SyS_write+0xd9/0x1c0 [ 163.713629] [] ? SyS_read+0x1c0/0x1c0 [ 163.719057] [] ? do_syscall_64+0x48/0x490 [ 163.724826] [] ? SyS_read+0x1c0/0x1c0 [ 163.730255] [] do_syscall_64+0x1a6/0x490 [ 163.736026] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 163.742922] Code: 74 08 3c 03 0f 8e 52 0a 00 00 41 83 bf 88 00 00 00 01 0f 84 14 07 00 00 e8 61 14 f6 ff 48 8d bb d8 00 00 00 48 89 f8 48 c1 e8 03 <42> 80 3c 30 00 0f 85 12 0a 00 00 48 8b 9b d8 00 00 00 48 85 db [ 163.769890] RIP [] perf_output_read+0x62d/0x12e0 [ 163.776404] RSP [ 163.780102] ---[ end trace 41e2187440390b11 ]--- [ 163.784836] Kernel panic - not syncing: Fatal exception [ 163.790593] Dumping ftrace buffer: [ 163.794104] (ftrace buffer empty) [ 163.797786] Kernel Offset: disabled [ 163.801385] Rebooting in 86400 seconds..