[ 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. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.8' (ECDSA) to the list of known hosts. 2020/06/10 12:53:14 fuzzer started 2020/06/10 12:53:15 dialing manager at 10.128.0.105:34607 2020/06/10 12:53:15 syscalls: 3076 2020/06/10 12:53:15 code coverage: enabled 2020/06/10 12:53:15 comparison tracing: enabled 2020/06/10 12:53:15 extra coverage: enabled 2020/06/10 12:53:15 setuid sandbox: enabled 2020/06/10 12:53:15 namespace sandbox: enabled 2020/06/10 12:53:15 Android sandbox: /sys/fs/selinux/policy does not exist 2020/06/10 12:53:15 fault injection: enabled 2020/06/10 12:53:15 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2020/06/10 12:53:15 net packet injection: enabled 2020/06/10 12:53:15 net device setup: enabled 2020/06/10 12:53:15 concurrency sanitizer: enabled 2020/06/10 12:53:15 devlink PCI setup: PCI device 0000:00:10.0 is not available 2020/06/10 12:53:15 USB emulation: enabled syzkaller login: [ 51.873680][ T8911] KCSAN: could not find function: '_find_next_bit' 2020/06/10 12:53:17 adding functions to KCSAN blacklist: 'ep_poll' 'copy_process' '__ext4_new_inode' 'futex_wait_queue_me' 'generic_write_end' 'blk_mq_get_request' '_find_next_bit' 'do_nanosleep' 'blk_mq_sched_dispatch_requests' 'find_get_pages_range_tag' 'echo_char' 'run_timer_softirq' 'ext4_mark_iloc_dirty' 'dd_has_work' 'xas_clear_mark' 'ext4_free_inodes_count' [ 73.960708][ T8897] ================================================================== [ 73.968822][ T8897] BUG: KCSAN: data-race in mod_timer / timer_clear_idle [ 73.975738][ T8897] [ 73.978057][ T8897] write to 0xffff88812c01dca4 of 1 bytes by task 0 on cpu 0: [ 73.985402][ T8897] timer_clear_idle+0x3d/0x50 [ 73.990053][ T8897] __tick_nohz_idle_restart_tick+0x32/0x1a0 [ 73.995930][ T8897] tick_nohz_idle_exit+0x19c/0x1d0 [ 74.001022][ T8897] do_idle+0xac/0x290 [ 74.004989][ T8897] cpu_startup_entry+0x14/0x20 [ 74.010269][ T8897] rest_init+0xe4/0xeb [ 74.014419][ T8897] arch_call_rest_init+0x13/0x2b [ 74.019370][ T8897] start_kernel+0x7fe/0x823 [ 74.023885][ T8897] secondary_startup_64+0xa4/0xb0 [ 74.028889][ T8897] [ 74.031214][ T8897] read to 0xffff88812c01dca4 of 1 bytes by task 8897 on cpu 1: [ 74.038742][ T8897] mod_timer+0x631/0x830 [ 74.042986][ T8897] sk_reset_timer+0x29/0xc0 [ 74.047467][ T8897] tcp_rearm_rto+0x1ce/0x280 [ 74.052102][ T8897] tcp_event_new_data_sent+0x23f/0x260 [ 74.057579][ T8897] tcp_write_xmit+0x5c6/0x31e0 [ 74.062324][ T8897] __tcp_push_pending_frames+0x72/0x1b0 [ 74.067877][ T8897] tcp_push+0x1ec/0x3e0 [ 74.072012][ T8897] tcp_sendmsg_locked+0x1de3/0x20f0 [ 74.077192][ T8897] tcp_sendmsg+0x35/0x50 [ 74.081410][ T8897] inet_sendmsg+0x69/0x90 [ 74.085731][ T8897] sock_sendmsg+0x98/0xc0 [ 74.090188][ T8897] sock_write_iter+0x186/0x240 [ 74.094946][ T8897] new_sync_write+0x303/0x400 [ 74.099598][ T8897] __vfs_write+0x9e/0xb0 [ 74.103811][ T8897] vfs_write+0x189/0x380 [ 74.108033][ T8897] ksys_write+0x16a/0x1a0 [ 74.112353][ T8897] __x64_sys_write+0x49/0x60 [ 74.116924][ T8897] do_syscall_64+0xc7/0x3b0 [ 74.121403][ T8897] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 74.127261][ T8897] [ 74.129561][ T8897] Reported by Kernel Concurrency Sanitizer on: [ 74.135695][ T8897] CPU: 1 PID: 8897 Comm: syz-fuzzer Not tainted 5.7.0-rc1-syzkaller #0 [ 74.143912][ T8897] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 74.154901][ T8897] ================================================================== [ 74.162945][ T8897] Kernel panic - not syncing: panic_on_warn set ... [ 74.171518][ T8897] CPU: 1 PID: 8897 Comm: syz-fuzzer Not tainted 5.7.0-rc1-syzkaller #0 [ 74.179728][ T8897] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 74.189935][ T8897] Call Trace: [ 74.193209][ T8897] dump_stack+0x11d/0x187 [ 74.197518][ T8897] panic+0x210/0x640 [ 74.201392][ T8897] ? vprintk_func+0x89/0x13a [ 74.205959][ T8897] kcsan_report.cold+0xc/0x1a [ 74.210638][ T8897] kcsan_setup_watchpoint+0x3fb/0x440 [ 74.216006][ T8897] mod_timer+0x631/0x830 [ 74.220324][ T8897] sk_reset_timer+0x29/0xc0 [ 74.224894][ T8897] tcp_rearm_rto+0x1ce/0x280 [ 74.229465][ T8897] tcp_event_new_data_sent+0x23f/0x260 [ 74.235723][ T8897] tcp_write_xmit+0x5c6/0x31e0 [ 74.240494][ T8897] ? iov_iter_advance+0x21c/0x900 [ 74.245642][ T8897] __tcp_push_pending_frames+0x72/0x1b0 [ 74.251381][ T8897] tcp_push+0x1ec/0x3e0 [ 74.256000][ T8897] tcp_sendmsg_locked+0x1de3/0x20f0 [ 74.261371][ T8897] ? aa_label_sk_perm.part.0+0x220/0x290 [ 74.267728][ T8897] tcp_sendmsg+0x35/0x50 [ 74.271962][ T8897] inet_sendmsg+0x69/0x90 [ 74.276547][ T8897] ? inet_send_prepare+0x1f0/0x1f0 [ 74.281651][ T8897] sock_sendmsg+0x98/0xc0 [ 74.286045][ T8897] sock_write_iter+0x186/0x240 [ 74.290945][ T8897] new_sync_write+0x303/0x400 [ 74.295624][ T8897] __vfs_write+0x9e/0xb0 [ 74.299869][ T8897] vfs_write+0x189/0x380 [ 74.304102][ T8897] ksys_write+0x16a/0x1a0 [ 74.308446][ T8897] __x64_sys_write+0x49/0x60 [ 74.313106][ T8897] do_syscall_64+0xc7/0x3b0 [ 74.317599][ T8897] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 74.323478][ T8897] RIP: 0033:0x4b3cdb [ 74.327624][ T8897] 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 [ 74.347475][ T8897] RSP: 002b:000000c00056d540 EFLAGS: 00000202 ORIG_RAX: 0000000000000001 [ 74.355880][ T8897] RAX: ffffffffffffffda RBX: 000000c00002e800 RCX: 00000000004b3cdb [ 74.363841][ T8897] RDX: 0000000000000008 RSI: 000000c00000a200 RDI: 0000000000000006 [ 74.372161][ T8897] RBP: 000000c00056d590 R08: 000000c00000a201 R09: 0000000000000008 [ 74.380283][ T8897] R10: 000000c0000c6000 R11: 0000000000000202 R12: 000000000000011e [ 74.388353][ T8897] R13: 000000c0002ee000 R14: 0000000000000007 R15: 0000000000001940 [ 75.472339][ T8897] Shutting down cpus with NMI [ 75.478632][ T8897] Kernel Offset: disabled [ 75.482961][ T8897] Rebooting in 86400 seconds..