[ OK ] Listening on Load/Save RF Kill Switch Status /dev/rfkill Watch. [ OK ] Started Serial Getty on ttyS0. [ OK ] Started Getty on tty1. [ OK ] Reached target Login Prompts. [ OK ] Reached target Multi-User System. [ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... [ OK ] Started Update UTMP about System Runlevel Changes. Starting Load/Save RF Kill Switch Status... [ OK ] Started Load/Save RF Kill Switch Status. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.208' (ECDSA) to the list of known hosts. 2020/06/17 00:15:17 fuzzer started 2020/06/17 00:15:17 dialing manager at 10.128.0.105:33867 2020/06/17 00:15:23 syscalls: 3085 2020/06/17 00:15:23 code coverage: enabled 2020/06/17 00:15:23 comparison tracing: enabled 2020/06/17 00:15:23 extra coverage: enabled 2020/06/17 00:15:23 setuid sandbox: enabled 2020/06/17 00:15:23 namespace sandbox: enabled 2020/06/17 00:15:23 Android sandbox: /sys/fs/selinux/policy does not exist 2020/06/17 00:15:23 fault injection: enabled 2020/06/17 00:15:23 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2020/06/17 00:15:23 net packet injection: enabled 2020/06/17 00:15:23 net device setup: enabled 2020/06/17 00:15:23 concurrency sanitizer: enabled 2020/06/17 00:15:23 devlink PCI setup: PCI device 0000:00:10.0 is not available 2020/06/17 00:15:23 USB emulation: enabled syzkaller login: [ 58.880597][ T8913] KCSAN: could not find function: '_find_next_bit' 2020/06/17 00:15:25 suppressing KCSAN reports in functions: 'find_get_pages_range_tag' 'generic_write_end' 'complete_signal' 'tick_nohz_idle_stop_tick' 'xas_clear_mark' 'run_timer_softirq' 'page_counter_charge' 'generic_fillattr' '_find_next_bit' 'pcpu_alloc' 'futex_wait_queue_me' 'add_timer' 'ext4_free_inodes_count' '__ext4_new_inode' 'copy_process' 'blk_mq_get_request' 'ext4_mark_iloc_dirty' 'do_nanosleep' 'ep_poll' 'ptrace_check_attach' '__send_signal' 'blk_mq_sched_dispatch_requests' 'ktime_get_real_seconds' 'tick_nohz_next_event' 'alloc_pid' [ 123.775351][ T8902] ================================================================== [ 123.783833][ T8902] BUG: KCSAN: data-race in mod_timer / timer_clear_idle [ 123.790858][ T8902] [ 123.793168][ T8902] write to 0xffff88812c01dca4 of 1 bytes by task 0 on cpu 0: [ 123.800800][ T8902] timer_clear_idle+0x3d/0x50 [ 123.805679][ T8902] __tick_nohz_idle_restart_tick+0x32/0x1a0 [ 123.811846][ T8902] tick_nohz_idle_exit+0x19c/0x1d0 [ 123.817447][ T8902] do_idle+0xac/0x290 [ 123.821409][ T8902] cpu_startup_entry+0x14/0x20 [ 123.826440][ T8902] rest_init+0xe4/0xeb [ 123.830495][ T8902] arch_call_rest_init+0x13/0x2b [ 123.835417][ T8902] start_kernel+0x7fe/0x823 [ 123.839998][ T8902] secondary_startup_64+0xa4/0xb0 [ 123.844993][ T8902] [ 123.847305][ T8902] read to 0xffff88812c01dca4 of 1 bytes by task 8902 on cpu 1: [ 123.854937][ T8902] mod_timer+0x631/0x830 [ 123.859166][ T8902] sk_reset_timer+0x29/0xc0 [ 123.863904][ T8902] tcp_rearm_rto+0x1ce/0x280 [ 123.868571][ T8902] tcp_event_new_data_sent+0x23f/0x260 [ 123.874022][ T8902] tcp_write_xmit+0x5c6/0x31e0 [ 123.878765][ T8902] __tcp_push_pending_frames+0x72/0x1b0 [ 123.888742][ T8902] tcp_push+0x1ec/0x3e0 [ 123.893143][ T8902] tcp_sendmsg_locked+0x1de3/0x20f0 [ 123.900918][ T8902] tcp_sendmsg+0x35/0x50 [ 123.905139][ T8902] inet_sendmsg+0x69/0x90 [ 123.909444][ T8902] sock_sendmsg+0x98/0xc0 [ 123.913747][ T8902] sock_write_iter+0x186/0x240 [ 123.918671][ T8902] new_sync_write+0x303/0x400 [ 123.923610][ T8902] __vfs_write+0x9e/0xb0 [ 123.927945][ T8902] vfs_write+0x189/0x380 [ 123.932264][ T8902] ksys_write+0x16a/0x1a0 [ 123.936569][ T8902] __x64_sys_write+0x49/0x60 [ 123.941137][ T8902] do_syscall_64+0xc7/0x3b0 [ 123.945712][ T8902] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 123.951772][ T8902] [ 123.954102][ T8902] Reported by Kernel Concurrency Sanitizer on: [ 123.960324][ T8902] CPU: 1 PID: 8902 Comm: syz-fuzzer Not tainted 5.7.0-rc1-syzkaller #0 [ 123.968896][ T8902] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 123.979078][ T8902] ================================================================== [ 123.987999][ T8902] Kernel panic - not syncing: panic_on_warn set ... [ 123.995609][ T8902] CPU: 1 PID: 8902 Comm: syz-fuzzer Not tainted 5.7.0-rc1-syzkaller #0 [ 124.004139][ T8902] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 124.014714][ T8902] Call Trace: [ 124.018022][ T8902] dump_stack+0x11d/0x187 [ 124.022437][ T8902] panic+0x210/0x640 [ 124.026513][ T8902] ? vprintk_func+0x89/0x13a [ 124.031131][ T8902] kcsan_report.cold+0xc/0x1a [ 124.036054][ T8902] kcsan_setup_watchpoint+0x3fb/0x440 [ 124.041407][ T8902] mod_timer+0x631/0x830 [ 124.046065][ T8902] sk_reset_timer+0x29/0xc0 [ 124.050548][ T8902] tcp_rearm_rto+0x1ce/0x280 [ 124.055116][ T8902] tcp_event_new_data_sent+0x23f/0x260 [ 124.060637][ T8902] tcp_write_xmit+0x5c6/0x31e0 [ 124.065385][ T8902] ? iov_iter_advance+0x21c/0x900 [ 124.070502][ T8902] __tcp_push_pending_frames+0x72/0x1b0 [ 124.076389][ T8902] tcp_push+0x1ec/0x3e0 [ 124.080524][ T8902] tcp_sendmsg_locked+0x1de3/0x20f0 [ 124.085804][ T8902] ? aa_label_sk_perm.part.0+0x220/0x290 [ 124.091521][ T8902] tcp_sendmsg+0x35/0x50 [ 124.096883][ T8902] inet_sendmsg+0x69/0x90 [ 124.101313][ T8902] ? inet_send_prepare+0x1f0/0x1f0 [ 124.106539][ T8902] sock_sendmsg+0x98/0xc0 [ 124.110942][ T8902] sock_write_iter+0x186/0x240 [ 124.115785][ T8902] new_sync_write+0x303/0x400 [ 124.120540][ T8902] __vfs_write+0x9e/0xb0 [ 124.124883][ T8902] vfs_write+0x189/0x380 [ 124.129191][ T8902] ksys_write+0x16a/0x1a0 [ 124.133509][ T8902] __x64_sys_write+0x49/0x60 [ 124.139478][ T8902] do_syscall_64+0xc7/0x3b0 [ 124.143973][ T8902] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 124.149851][ T8902] RIP: 0033:0x4b3cdb [ 124.153725][ T8902] Code: ff e9 69 ff ff ff cc cc cc cc cc cc cc cc cc e8 bb a1 f8 ff 48 8b 7c 24 10 48 8b 74 24 18 48 8b 54 24 20 48 8b 44 24 08 0f 05 <48> 3d 01 f0 ff ff 76 20 48 c7 44 24 28 ff ff ff ff 48 c7 44 24 30 [ 124.173750][ T8902] RSP: 002b:000000c0057cf540 EFLAGS: 00000202 ORIG_RAX: 0000000000000001 [ 124.182506][ T8902] RAX: ffffffffffffffda RBX: 000000c00002c000 RCX: 00000000004b3cdb [ 124.190473][ T8902] RDX: 0000000000000007 RSI: 000000c00000a200 RDI: 0000000000000006 [ 124.204015][ T8902] RBP: 000000c0057cf590 R08: 000000c00000a201 R09: 0000000000000007 [ 124.212142][ T8902] R10: 000000c000114000 R11: 0000000000000202 R12: 000000000000011e [ 124.221344][ T8902] R13: 000000c0004a0000 R14: 0000000000000007 R15: 00000000000070ea [ 125.307655][ T8902] Shutting down cpus with NMI [ 125.314056][ T8902] Kernel Offset: disabled [ 125.318419][ T8902] Rebooting in 86400 seconds..