[ 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 '10.128.10.30' (ECDSA) to the list of known hosts. 2020/06/12 16:21:27 fuzzer started 2020/06/12 16:21:27 dialing manager at 10.128.0.105:35517 2020/06/12 16:21:28 syscalls: 3085 2020/06/12 16:21:28 code coverage: enabled 2020/06/12 16:21:28 comparison tracing: enabled 2020/06/12 16:21:28 extra coverage: enabled 2020/06/12 16:21:28 setuid sandbox: enabled 2020/06/12 16:21:28 namespace sandbox: enabled 2020/06/12 16:21:28 Android sandbox: /sys/fs/selinux/policy does not exist 2020/06/12 16:21:28 fault injection: enabled 2020/06/12 16:21:28 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2020/06/12 16:21:28 net packet injection: enabled 2020/06/12 16:21:28 net device setup: enabled 2020/06/12 16:21:28 concurrency sanitizer: enabled 2020/06/12 16:21:28 devlink PCI setup: PCI device 0000:00:10.0 is not available 2020/06/12 16:21:28 USB emulation: enabled 2020/06/12 16:21:28 adding functions to KCSAN blacklist: 'copy_process' 'alloc_pid' '__ext4_new_inode' 'ep_poll' 'xas_clear_mark' 'find_get_pages_range_tag' syzkaller login: [ 55.897418][ T8878] ================================================================== [ 55.905546][ T8878] BUG: KCSAN: data-race in mod_timer / timer_clear_idle [ 55.912492][ T8878] [ 55.914801][ T8878] write to 0xffff88812c11dca4 of 1 bytes by task 0 on cpu 1: [ 55.922160][ T8878] timer_clear_idle+0x3d/0x50 [ 55.926810][ T8878] __tick_nohz_idle_restart_tick+0x32/0x1a0 [ 55.932719][ T8878] tick_nohz_idle_exit+0x19c/0x1d0 [ 55.937808][ T8878] do_idle+0xac/0x290 [ 55.941775][ T8878] cpu_startup_entry+0x14/0x20 [ 55.946512][ T8878] start_secondary+0x169/0x1b0 [ 55.951246][ T8878] secondary_startup_64+0xa4/0xb0 [ 55.956246][ T8878] [ 55.958560][ T8878] read to 0xffff88812c11dca4 of 1 bytes by task 8878 on cpu 0: [ 55.966079][ T8878] mod_timer+0x631/0x830 [ 55.970293][ T8878] sk_reset_timer+0x29/0xc0 [ 55.974781][ T8878] tcp_rearm_rto+0x1ce/0x280 [ 55.979346][ T8878] tcp_event_new_data_sent+0x23f/0x260 [ 55.984805][ T8878] tcp_write_xmit+0x5c6/0x31e0 [ 55.989558][ T8878] __tcp_push_pending_frames+0x72/0x1b0 [ 55.995081][ T8878] tcp_push+0x1ec/0x3e0 [ 55.999212][ T8878] tcp_sendmsg_locked+0x1de3/0x20f0 [ 56.004389][ T8878] tcp_sendmsg+0x35/0x50 [ 56.008726][ T8878] inet_sendmsg+0x69/0x90 [ 56.013030][ T8878] sock_sendmsg+0x98/0xc0 [ 56.017447][ T8878] sock_write_iter+0x186/0x240 [ 56.022183][ T8878] new_sync_write+0x303/0x400 [ 56.026830][ T8878] __vfs_write+0x9e/0xb0 [ 56.031071][ T8878] vfs_write+0x189/0x380 [ 56.035284][ T8878] ksys_write+0x16a/0x1a0 [ 56.039597][ T8878] __x64_sys_write+0x49/0x60 [ 56.044188][ T8878] do_syscall_64+0xc7/0x3b0 [ 56.048680][ T8878] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 56.054568][ T8878] [ 56.056867][ T8878] Reported by Kernel Concurrency Sanitizer on: [ 56.063007][ T8878] CPU: 0 PID: 8878 Comm: syz-fuzzer Not tainted 5.7.0-rc1-syzkaller #0 [ 56.071241][ T8878] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 56.081266][ T8878] ================================================================== [ 56.089293][ T8878] Kernel panic - not syncing: panic_on_warn set ... [ 56.095869][ T8878] CPU: 0 PID: 8878 Comm: syz-fuzzer Not tainted 5.7.0-rc1-syzkaller #0 [ 56.104086][ T8878] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 56.114110][ T8878] Call Trace: [ 56.117395][ T8878] dump_stack+0x11d/0x187 [ 56.121716][ T8878] panic+0x210/0x640 [ 56.125604][ T8878] ? vprintk_func+0x89/0x13a [ 56.130170][ T8878] kcsan_report.cold+0xc/0x1a [ 56.134826][ T8878] kcsan_setup_watchpoint+0x3fb/0x440 [ 56.140189][ T8878] mod_timer+0x631/0x830 [ 56.144410][ T8878] sk_reset_timer+0x29/0xc0 [ 56.148895][ T8878] tcp_rearm_rto+0x1ce/0x280 [ 56.153462][ T8878] tcp_event_new_data_sent+0x23f/0x260 [ 56.158926][ T8878] tcp_write_xmit+0x5c6/0x31e0 [ 56.163671][ T8878] ? iov_iter_advance+0x21c/0x900 [ 56.168670][ T8878] __tcp_push_pending_frames+0x72/0x1b0 [ 56.174191][ T8878] tcp_push+0x1ec/0x3e0 [ 56.178325][ T8878] tcp_sendmsg_locked+0x1de3/0x20f0 [ 56.183531][ T8878] ? aa_label_sk_perm.part.0+0x220/0x290 [ 56.189161][ T8878] tcp_sendmsg+0x35/0x50 [ 56.193384][ T8878] inet_sendmsg+0x69/0x90 [ 56.197688][ T8878] ? inet_send_prepare+0x1f0/0x1f0 [ 56.202781][ T8878] sock_sendmsg+0x98/0xc0 [ 56.207086][ T8878] sock_write_iter+0x186/0x240 [ 56.211831][ T8878] new_sync_write+0x303/0x400 [ 56.216487][ T8878] __vfs_write+0x9e/0xb0 [ 56.220737][ T8878] vfs_write+0x189/0x380 [ 56.224954][ T8878] ksys_write+0x16a/0x1a0 [ 56.229256][ T8878] __x64_sys_write+0x49/0x60 [ 56.233822][ T8878] do_syscall_64+0xc7/0x3b0 [ 56.238302][ T8878] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 56.244179][ T8878] RIP: 0033:0x4b3cdb [ 56.248053][ T8878] 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 [ 56.267628][ T8878] RSP: 002b:000000c00023d540 EFLAGS: 00000202 ORIG_RAX: 0000000000000001 [ 56.276012][ T8878] RAX: ffffffffffffffda RBX: 000000c00002c000 RCX: 00000000004b3cdb [ 56.283955][ T8878] RDX: 0000000000000007 RSI: 000000c00000a200 RDI: 0000000000000006 [ 56.291919][ T8878] RBP: 000000c00023d590 R08: 000000c00000a201 R09: 0000000000000007 [ 56.299878][ T8878] R10: 000000c00007e000 R11: 0000000000000202 R12: 000000000000011e [ 56.307837][ T8878] R13: 000000c00031c000 R14: 0000000000000007 R15: 0000000000001561 [ 57.452415][ T8878] Shutting down cpus with NMI [ 57.458257][ T8878] Kernel Offset: disabled [ 57.462570][ T8878] Rebooting in 86400 seconds..