[ 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 '10.128.0.33' (ECDSA) to the list of known hosts. 2020/05/26 17:11:34 fuzzer started 2020/05/26 17:11:34 dialing manager at 10.128.0.105:37123 2020/05/26 17:11:34 syscalls: 3055 2020/05/26 17:11:34 code coverage: enabled 2020/05/26 17:11:34 comparison tracing: enabled 2020/05/26 17:11:34 extra coverage: enabled 2020/05/26 17:11:34 setuid sandbox: enabled 2020/05/26 17:11:34 namespace sandbox: enabled 2020/05/26 17:11:34 Android sandbox: /sys/fs/selinux/policy does not exist 2020/05/26 17:11:34 fault injection: enabled 2020/05/26 17:11:34 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2020/05/26 17:11:34 net packet injection: enabled 2020/05/26 17:11:34 net device setup: enabled 2020/05/26 17:11:34 concurrency sanitizer: enabled 2020/05/26 17:11:34 devlink PCI setup: PCI device 0000:00:10.0 is not available 2020/05/26 17:11:34 USB emulation: enabled 2020/05/26 17:11:34 adding functions to KCSAN blacklist: 'ext4_mark_iloc_dirty' 'page_counter_charge' 'find_get_pages_range_tag' 'copy_process' syzkaller login: [ 50.618788][ T8906] ================================================================== [ 50.626890][ T8906] BUG: KCSAN: data-race in mod_timer / timer_clear_idle [ 50.633825][ T8906] [ 50.636146][ T8906] write to 0xffff88812c01dca4 of 1 bytes by task 0 on cpu 0: [ 50.643503][ T8906] timer_clear_idle+0x3d/0x50 [ 50.648168][ T8906] __tick_nohz_idle_restart_tick+0x32/0x1a0 [ 50.654047][ T8906] tick_nohz_idle_exit+0x19c/0x1d0 [ 50.659142][ T8906] do_idle+0xac/0x290 [ 50.663107][ T8906] cpu_startup_entry+0x14/0x20 [ 50.667843][ T8906] rest_init+0xe4/0xeb [ 50.671885][ T8906] arch_call_rest_init+0x13/0x2b [ 50.676795][ T8906] start_kernel+0x7fe/0x823 [ 50.681283][ T8906] secondary_startup_64+0xa4/0xb0 [ 50.686273][ T8906] [ 50.688578][ T8906] read to 0xffff88812c01dca4 of 1 bytes by task 8906 on cpu 1: [ 50.696092][ T8906] mod_timer+0x631/0x830 [ 50.700307][ T8906] sk_reset_timer+0x29/0xc0 [ 50.704787][ T8906] tcp_rearm_rto+0x1ce/0x280 [ 50.709362][ T8906] tcp_event_new_data_sent+0x23f/0x260 [ 50.714806][ T8906] tcp_write_xmit+0x5c6/0x31e0 [ 50.719546][ T8906] __tcp_push_pending_frames+0x72/0x1b0 [ 50.725061][ T8906] tcp_push+0x1ec/0x3e0 [ 50.729200][ T8906] tcp_sendmsg_locked+0x1de3/0x20f0 [ 50.734380][ T8906] tcp_sendmsg+0x35/0x50 [ 50.739391][ T8906] inet_sendmsg+0x69/0x90 [ 50.743692][ T8906] sock_sendmsg+0x98/0xc0 [ 50.747996][ T8906] sock_write_iter+0x186/0x240 [ 50.752734][ T8906] new_sync_write+0x303/0x400 [ 50.757386][ T8906] __vfs_write+0x9e/0xb0 [ 50.761599][ T8906] vfs_write+0x189/0x380 [ 50.765813][ T8906] ksys_write+0x16a/0x1a0 [ 50.770113][ T8906] __x64_sys_write+0x49/0x60 [ 50.774683][ T8906] do_syscall_64+0xc7/0x3b0 [ 50.779172][ T8906] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 50.785029][ T8906] [ 50.787327][ T8906] Reported by Kernel Concurrency Sanitizer on: [ 50.793470][ T8906] CPU: 1 PID: 8906 Comm: syz-fuzzer Not tainted 5.7.0-rc1-syzkaller #0 [ 50.802459][ T8906] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 50.812498][ T8906] ================================================================== [ 50.820574][ T8906] Kernel panic - not syncing: panic_on_warn set ... [ 50.827177][ T8906] CPU: 1 PID: 8906 Comm: syz-fuzzer Not tainted 5.7.0-rc1-syzkaller #0 [ 50.835382][ T8906] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 50.845542][ T8906] Call Trace: [ 50.848815][ T8906] dump_stack+0x11d/0x187 [ 50.853124][ T8906] panic+0x210/0x640 [ 50.857009][ T8906] ? vprintk_func+0x89/0x13a [ 50.861576][ T8906] kcsan_report.cold+0xc/0x1a [ 50.866246][ T8906] kcsan_setup_watchpoint+0x3fb/0x440 [ 50.871599][ T8906] mod_timer+0x631/0x830 [ 50.875822][ T8906] sk_reset_timer+0x29/0xc0 [ 50.880320][ T8906] tcp_rearm_rto+0x1ce/0x280 [ 50.884889][ T8906] tcp_event_new_data_sent+0x23f/0x260 [ 50.890335][ T8906] tcp_write_xmit+0x5c6/0x31e0 [ 50.895168][ T8906] ? iov_iter_advance+0x21c/0x900 [ 50.900174][ T8906] __tcp_push_pending_frames+0x72/0x1b0 [ 50.905692][ T8906] tcp_push+0x1ec/0x3e0 [ 50.909827][ T8906] tcp_sendmsg_locked+0x1de3/0x20f0 [ 50.915004][ T8906] ? aa_label_sk_perm.part.0+0x220/0x290 [ 50.920617][ T8906] tcp_sendmsg+0x35/0x50 [ 50.924837][ T8906] inet_sendmsg+0x69/0x90 [ 50.929154][ T8906] ? inet_send_prepare+0x1f0/0x1f0 [ 50.934239][ T8906] sock_sendmsg+0x98/0xc0 [ 50.938546][ T8906] sock_write_iter+0x186/0x240 [ 50.943304][ T8906] new_sync_write+0x303/0x400 [ 50.947972][ T8906] __vfs_write+0x9e/0xb0 [ 50.952189][ T8906] vfs_write+0x189/0x380 [ 50.956404][ T8906] ksys_write+0x16a/0x1a0 [ 50.960711][ T8906] __x64_sys_write+0x49/0x60 [ 50.965280][ T8906] do_syscall_64+0xc7/0x3b0 [ 50.969760][ T8906] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 50.975623][ T8906] RIP: 0033:0x47c530 [ 50.979498][ T8906] Code: 8b 7c 24 10 48 8b 74 24 18 48 8b 54 24 20 49 c7 c2 00 00 00 00 49 c7 c0 00 00 00 00 49 c7 c1 00 00 00 00 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 [ 50.999084][ T8906] RSP: 002b:000000c4209d34a0 EFLAGS: 00000202 ORIG_RAX: 0000000000000001 [ 51.007466][ T8906] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000047c530 [ 51.015422][ T8906] RDX: 0000000000000007 RSI: 000000c420340200 RDI: 0000000000000003 [ 51.023376][ T8906] RBP: 000000c4209d34f8 R08: 0000000000000000 R09: 0000000000000000 [ 51.031354][ T8906] R10: 0000000000000000 R11: 0000000000000202 R12: 000000c4200c3b00 [ 51.039303][ T8906] R13: 0000000000000007 R14: 0000000000c79d40 R15: 0000000000000760 [ 52.121268][ T8906] Shutting down cpus with NMI [ 52.127432][ T8906] Kernel Offset: disabled [ 52.131780][ T8906] Rebooting in 86400 seconds..