[ 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 '10.128.1.13' (ECDSA) to the list of known hosts. 2020/06/12 04:22:35 fuzzer started 2020/06/12 04:22:35 dialing manager at 10.128.0.105:39483 2020/06/12 04:22:35 syscalls: 3085 2020/06/12 04:22:35 code coverage: enabled 2020/06/12 04:22:35 comparison tracing: enabled 2020/06/12 04:22:35 extra coverage: enabled 2020/06/12 04:22:35 setuid sandbox: enabled 2020/06/12 04:22:35 namespace sandbox: enabled 2020/06/12 04:22:35 Android sandbox: /sys/fs/selinux/policy does not exist 2020/06/12 04:22:35 fault injection: enabled 2020/06/12 04:22:35 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2020/06/12 04:22:35 net packet injection: enabled 2020/06/12 04:22:35 net device setup: enabled 2020/06/12 04:22:35 concurrency sanitizer: enabled 2020/06/12 04:22:35 devlink PCI setup: PCI device 0000:00:10.0 is not available 2020/06/12 04:22:35 USB emulation: enabled 2020/06/12 04:22:36 adding functions to KCSAN blacklist: 'file_update_time' 'blk_mq_get_request' 'ep_poll' 'complete_signal' 'futex_wait_queue_me' 'add_timer' 'xas_clear_mark' 'tick_nohz_idle_stop_tick' 'copy_process' 'page_counter_charge' syzkaller login: [ 52.803359][ T8903] ================================================================== [ 52.811460][ T8903] BUG: KCSAN: data-race in mod_timer / timer_clear_idle [ 52.818414][ T8903] [ 52.820720][ T8903] write to 0xffff88812c11dca4 of 1 bytes by task 0 on cpu 1: [ 52.828101][ T8903] timer_clear_idle+0x3d/0x50 [ 52.832781][ T8903] __tick_nohz_idle_restart_tick+0x32/0x1a0 [ 52.838650][ T8903] tick_nohz_idle_exit+0x19c/0x1d0 [ 52.843737][ T8903] do_idle+0xac/0x290 [ 52.847693][ T8903] cpu_startup_entry+0x14/0x20 [ 52.852443][ T8903] start_secondary+0x169/0x1b0 [ 52.857179][ T8903] secondary_startup_64+0xa4/0xb0 [ 52.862168][ T8903] [ 52.864493][ T8903] read to 0xffff88812c11dca4 of 1 bytes by task 8903 on cpu 0: [ 52.872010][ T8903] mod_timer+0x631/0x830 [ 52.876225][ T8903] sk_reset_timer+0x29/0xc0 [ 52.880703][ T8903] tcp_rearm_rto+0x1ce/0x280 [ 52.887448][ T8903] tcp_event_new_data_sent+0x23f/0x260 [ 52.892894][ T8903] tcp_write_xmit+0x5c6/0x31e0 [ 52.897631][ T8903] __tcp_push_pending_frames+0x72/0x1b0 [ 52.903149][ T8903] tcp_push+0x1ec/0x3e0 [ 52.907277][ T8903] tcp_sendmsg_locked+0x1de3/0x20f0 [ 52.912447][ T8903] tcp_sendmsg+0x35/0x50 [ 52.916665][ T8903] inet_sendmsg+0x69/0x90 [ 52.921065][ T8903] sock_sendmsg+0x98/0xc0 [ 52.925367][ T8903] sock_write_iter+0x186/0x240 [ 52.930118][ T8903] new_sync_write+0x303/0x400 [ 52.934775][ T8903] __vfs_write+0x9e/0xb0 [ 52.939003][ T8903] vfs_write+0x189/0x380 [ 52.943237][ T8903] ksys_write+0x16a/0x1a0 [ 52.947536][ T8903] __x64_sys_write+0x49/0x60 [ 52.952100][ T8903] do_syscall_64+0xc7/0x3b0 [ 52.956576][ T8903] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 52.962447][ T8903] [ 52.964746][ T8903] Reported by Kernel Concurrency Sanitizer on: [ 52.970935][ T8903] CPU: 0 PID: 8903 Comm: syz-fuzzer Not tainted 5.7.0-rc1-syzkaller #0 [ 52.979158][ T8903] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 52.990838][ T8903] ================================================================== [ 52.998896][ T8903] Kernel panic - not syncing: panic_on_warn set ... [ 53.005465][ T8903] CPU: 0 PID: 8903 Comm: syz-fuzzer Not tainted 5.7.0-rc1-syzkaller #0 [ 53.013688][ T8903] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 53.023722][ T8903] Call Trace: [ 53.026999][ T8903] dump_stack+0x11d/0x187 [ 53.031309][ T8903] panic+0x210/0x640 [ 53.035198][ T8903] ? vprintk_func+0x89/0x13a [ 53.039775][ T8903] kcsan_report.cold+0xc/0x1a [ 53.044457][ T8903] kcsan_setup_watchpoint+0x3fb/0x440 [ 53.049822][ T8903] mod_timer+0x631/0x830 [ 53.054065][ T8903] sk_reset_timer+0x29/0xc0 [ 53.058551][ T8903] tcp_rearm_rto+0x1ce/0x280 [ 53.063130][ T8903] tcp_event_new_data_sent+0x23f/0x260 [ 53.068575][ T8903] tcp_write_xmit+0x5c6/0x31e0 [ 53.073330][ T8903] ? iov_iter_advance+0x21c/0x900 [ 53.078365][ T8903] __tcp_push_pending_frames+0x72/0x1b0 [ 53.083905][ T8903] tcp_push+0x1ec/0x3e0 [ 53.088070][ T8903] tcp_sendmsg_locked+0x1de3/0x20f0 [ 53.093262][ T8903] ? aa_label_sk_perm.part.0+0x220/0x290 [ 53.098887][ T8903] tcp_sendmsg+0x35/0x50 [ 53.103112][ T8903] inet_sendmsg+0x69/0x90 [ 53.107421][ T8903] ? inet_send_prepare+0x1f0/0x1f0 [ 53.112508][ T8903] sock_sendmsg+0x98/0xc0 [ 53.119940][ T8903] sock_write_iter+0x186/0x240 [ 53.124685][ T8903] new_sync_write+0x303/0x400 [ 53.129345][ T8903] __vfs_write+0x9e/0xb0 [ 53.133577][ T8903] vfs_write+0x189/0x380 [ 53.137797][ T8903] ksys_write+0x16a/0x1a0 [ 53.142104][ T8903] __x64_sys_write+0x49/0x60 [ 53.146709][ T8903] do_syscall_64+0xc7/0x3b0 [ 53.151191][ T8903] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 53.157074][ T8903] RIP: 0033:0x4b3cdb [ 53.160949][ T8903] 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 [ 53.180538][ T8903] RSP: 002b:000000c000287540 EFLAGS: 00000202 ORIG_RAX: 0000000000000001 [ 53.188925][ T8903] RAX: ffffffffffffffda RBX: 000000c00002c000 RCX: 00000000004b3cdb [ 53.196881][ T8903] RDX: 0000000000000007 RSI: 000000c00000a200 RDI: 0000000000000006 [ 53.204839][ T8903] RBP: 000000c000287590 R08: 000000c00000a201 R09: 0000000000000007 [ 53.212792][ T8903] R10: 000000c0000c6000 R11: 0000000000000202 R12: 000000000000011e [ 53.220739][ T8903] R13: 000000c0004c2000 R14: 000000000000000f R15: 0000000000000601 [ 54.303095][ T8903] Shutting down cpus with NMI [ 54.309528][ T8903] Kernel Offset: disabled [ 54.313842][ T8903] Rebooting in 86400 seconds..