[ 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 '10.128.0.96' (ECDSA) to the list of known hosts. 2020/05/29 02:12:42 fuzzer started 2020/05/29 02:12:42 dialing manager at 10.128.0.105:45871 2020/05/29 02:12:51 syscalls: 3055 2020/05/29 02:12:51 code coverage: enabled 2020/05/29 02:12:51 comparison tracing: enabled 2020/05/29 02:12:51 extra coverage: enabled 2020/05/29 02:12:51 setuid sandbox: enabled 2020/05/29 02:12:51 namespace sandbox: enabled 2020/05/29 02:12:51 Android sandbox: /sys/fs/selinux/policy does not exist 2020/05/29 02:12:51 fault injection: enabled 2020/05/29 02:12:51 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2020/05/29 02:12:51 net packet injection: enabled 2020/05/29 02:12:51 net device setup: enabled 2020/05/29 02:12:51 concurrency sanitizer: enabled 2020/05/29 02:12:51 devlink PCI setup: PCI device 0000:00:10.0 is not available 2020/05/29 02:12:51 USB emulation: enabled syzkaller login: [ 61.834803][ T8939] KCSAN: could not find function: 'poll_schedule_timeout' 2020/05/29 02:12:53 adding functions to KCSAN blacklist: 'generic_fillattr' 'add_timer' 'ext4_free_inodes_count' 'alloc_pid' 'do_nanosleep' 'run_timer_softirq' 'do_group_exit' 'blk_mq_dispatch_rq_list' 'page_counter_charge' 'shmem_file_read_iter' 'ext4_mb_good_group' 'generic_write_end' 'poll_schedule_timeout' 'kauditd_thread' 'ext4_ext_try_to_merge_right' 'futex_wait_queue_me' 'ext4_mb_find_by_goal' 'blk_mq_sched_dispatch_requests' 'xas_clear_mark' 'find_get_pages_range_tag' '__ext4_new_inode' 'ep_poll' 'file_update_time' 'copy_process' 'tick_nohz_idle_stop_tick' [ 152.102769][ T8929] ================================================================== [ 152.110896][ T8929] BUG: KCSAN: data-race in mod_timer / timer_clear_idle [ 152.117802][ T8929] [ 152.120126][ T8929] write to 0xffff88812c01dca4 of 1 bytes by task 0 on cpu 0: [ 152.127473][ T8929] timer_clear_idle+0x3d/0x50 [ 152.132154][ T8929] __tick_nohz_idle_restart_tick+0x32/0x1a0 [ 152.138060][ T8929] tick_nohz_idle_exit+0x19c/0x1d0 [ 152.143170][ T8929] do_idle+0xac/0x290 [ 152.147144][ T8929] cpu_startup_entry+0x14/0x20 [ 152.151886][ T8929] rest_init+0xe4/0xeb [ 152.156023][ T8929] arch_call_rest_init+0x13/0x2b [ 152.160959][ T8929] start_kernel+0x7fe/0x823 [ 152.165458][ T8929] secondary_startup_64+0xa4/0xb0 [ 152.170465][ T8929] [ 152.172775][ T8929] read to 0xffff88812c01dca4 of 1 bytes by task 8929 on cpu 1: [ 152.180295][ T8929] mod_timer+0x631/0x830 [ 152.184528][ T8929] sk_reset_timer+0x29/0xc0 [ 152.189011][ T8929] tcp_rearm_rto+0x1ce/0x280 [ 152.193668][ T8929] tcp_event_new_data_sent+0x23f/0x260 [ 152.199115][ T8929] tcp_write_xmit+0x5c6/0x31e0 [ 152.203961][ T8929] __tcp_push_pending_frames+0x72/0x1b0 [ 152.209482][ T8929] tcp_push+0x1ec/0x3e0 [ 152.213626][ T8929] tcp_sendmsg_locked+0x1de3/0x20f0 [ 152.218820][ T8929] tcp_sendmsg+0x35/0x50 [ 152.223094][ T8929] inet_sendmsg+0x69/0x90 [ 152.227452][ T8929] sock_sendmsg+0x98/0xc0 [ 152.231778][ T8929] sock_write_iter+0x186/0x240 [ 152.236519][ T8929] new_sync_write+0x303/0x400 [ 152.241172][ T8929] __vfs_write+0x9e/0xb0 [ 152.245563][ T8929] vfs_write+0x189/0x380 [ 152.249783][ T8929] ksys_write+0x16a/0x1a0 [ 152.254099][ T8929] __x64_sys_write+0x49/0x60 [ 152.258678][ T8929] do_syscall_64+0xc7/0x3b0 [ 152.263345][ T8929] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 152.269220][ T8929] [ 152.271521][ T8929] Reported by Kernel Concurrency Sanitizer on: [ 152.277666][ T8929] CPU: 1 PID: 8929 Comm: syz-fuzzer Not tainted 5.7.0-rc1-syzkaller #0 [ 152.285889][ T8929] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 152.295933][ T8929] ================================================================== [ 152.304068][ T8929] Kernel panic - not syncing: panic_on_warn set ... [ 152.310650][ T8929] CPU: 1 PID: 8929 Comm: syz-fuzzer Not tainted 5.7.0-rc1-syzkaller #0 [ 152.318876][ T8929] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 152.328923][ T8929] Call Trace: [ 152.332198][ T8929] dump_stack+0x11d/0x187 [ 152.336509][ T8929] panic+0x210/0x640 [ 152.340385][ T8929] ? vprintk_func+0x89/0x13a [ 152.345127][ T8929] kcsan_report.cold+0xc/0x1a [ 152.349802][ T8929] kcsan_setup_watchpoint+0x3fb/0x440 [ 152.355155][ T8929] mod_timer+0x631/0x830 [ 152.359380][ T8929] sk_reset_timer+0x29/0xc0 [ 152.363878][ T8929] tcp_rearm_rto+0x1ce/0x280 [ 152.368451][ T8929] tcp_event_new_data_sent+0x23f/0x260 [ 152.373889][ T8929] tcp_write_xmit+0x5c6/0x31e0 [ 152.378637][ T8929] ? iov_iter_advance+0x21c/0x900 [ 152.383642][ T8929] __tcp_push_pending_frames+0x72/0x1b0 [ 152.389165][ T8929] tcp_push+0x1ec/0x3e0 [ 152.393301][ T8929] tcp_sendmsg_locked+0x1de3/0x20f0 [ 152.398483][ T8929] ? aa_label_sk_perm.part.0+0x220/0x290 [ 152.404112][ T8929] tcp_sendmsg+0x35/0x50 [ 152.408348][ T8929] inet_sendmsg+0x69/0x90 [ 152.412656][ T8929] ? inet_send_prepare+0x1f0/0x1f0 [ 152.417747][ T8929] sock_sendmsg+0x98/0xc0 [ 152.422064][ T8929] sock_write_iter+0x186/0x240 [ 152.426827][ T8929] new_sync_write+0x303/0x400 [ 152.431489][ T8929] __vfs_write+0x9e/0xb0 [ 152.435708][ T8929] vfs_write+0x189/0x380 [ 152.439928][ T8929] ksys_write+0x16a/0x1a0 [ 152.444250][ T8929] __x64_sys_write+0x49/0x60 [ 152.448844][ T8929] do_syscall_64+0xc7/0x3b0 [ 152.453339][ T8929] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 152.459223][ T8929] RIP: 0033:0x4b3cdb [ 152.463101][ T8929] 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 [ 152.482781][ T8929] RSP: 002b:000000c0002b1540 EFLAGS: 00000202 ORIG_RAX: 0000000000000001 [ 152.491170][ T8929] RAX: ffffffffffffffda RBX: 000000c00002c000 RCX: 00000000004b3cdb [ 152.499294][ T8929] RDX: 0000000000000007 RSI: 000000c00000a3e0 RDI: 0000000000000006 [ 152.507241][ T8929] RBP: 000000c0002b1590 R08: 000000c00000a301 R09: 0000000000000007 [ 152.515202][ T8929] R10: 000000c000112000 R11: 0000000000000202 R12: 000000000000011e [ 152.523160][ T8929] R13: 000000c0002b8000 R14: 0000000000000007 R15: 000000000000602e [ 153.605174][ T8929] Shutting down cpus with NMI [ 153.611184][ T8929] Kernel Offset: disabled [ 153.615506][ T8929] Rebooting in 86400 seconds..