[ 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 '10.128.0.107' (ECDSA) to the list of known hosts. 2020/06/03 01:25:29 fuzzer started 2020/06/03 01:25:29 dialing manager at 10.128.0.105:34577 2020/06/03 01:25:30 syscalls: 3055 2020/06/03 01:25:30 code coverage: enabled 2020/06/03 01:25:30 comparison tracing: enabled 2020/06/03 01:25:30 extra coverage: enabled 2020/06/03 01:25:30 setuid sandbox: enabled 2020/06/03 01:25:30 namespace sandbox: enabled 2020/06/03 01:25:30 Android sandbox: /sys/fs/selinux/policy does not exist 2020/06/03 01:25:30 fault injection: enabled 2020/06/03 01:25:30 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2020/06/03 01:25:30 net packet injection: enabled 2020/06/03 01:25:30 net device setup: enabled 2020/06/03 01:25:30 concurrency sanitizer: enabled 2020/06/03 01:25:30 devlink PCI setup: PCI device 0000:00:10.0 is not available 2020/06/03 01:25:30 USB emulation: enabled syzkaller login: [ 52.662092][ T8931] KCSAN: could not find function: '_find_next_bit' [ 53.503228][ T8931] KCSAN: could not find function: 'poll_schedule_timeout' 2020/06/03 01:25:33 adding functions to KCSAN blacklist: 'file_update_time' 'copy_process' 'kauditd_thread' 'blk_mq_get_request' 'page_counter_charge' 'ext4_free_inodes_count' 'futex_wait_queue_me' 'xas_clear_mark' 'generic_write_end' 'do_nanosleep' '__ext4_new_inode' 'generic_fillattr' 'ext4_mb_good_group' '_find_next_bit' 'run_timer_softirq' 'ep_poll' 'atime_needs_update' 'complete_signal' 'vm_area_dup' 'poll_schedule_timeout' 'find_get_pages_range_tag' '__mark_inode_dirty' 'kcm_rfree' 'tick_nohz_next_event' [ 94.352192][ T8922] ================================================================== [ 94.360326][ T8922] BUG: KCSAN: data-race in mod_timer / timer_clear_idle [ 94.367272][ T8922] [ 94.369583][ T8922] write to 0xffff88812c11dca4 of 1 bytes by task 0 on cpu 1: [ 94.376930][ T8922] timer_clear_idle+0x3d/0x50 [ 94.381584][ T8922] __tick_nohz_idle_restart_tick+0x32/0x1a0 [ 94.387457][ T8922] tick_nohz_idle_exit+0x19c/0x1d0 [ 94.392544][ T8922] do_idle+0xac/0x290 [ 94.396552][ T8922] cpu_startup_entry+0x14/0x20 [ 94.401292][ T8922] start_secondary+0x169/0x1b0 [ 94.406031][ T8922] secondary_startup_64+0xa4/0xb0 [ 94.411036][ T8922] [ 94.413343][ T8922] read to 0xffff88812c11dca4 of 1 bytes by task 8922 on cpu 0: [ 94.421001][ T8922] mod_timer+0x631/0x830 [ 94.425232][ T8922] sk_reset_timer+0x29/0xc0 [ 94.429714][ T8922] tcp_rearm_rto+0x1ce/0x280 [ 94.434345][ T8922] tcp_event_new_data_sent+0x23f/0x260 [ 94.439820][ T8922] tcp_write_xmit+0x5c6/0x31e0 [ 94.444563][ T8922] __tcp_push_pending_frames+0x72/0x1b0 [ 94.450093][ T8922] tcp_push+0x1ec/0x3e0 [ 94.454237][ T8922] tcp_sendmsg_locked+0x1de3/0x20f0 [ 94.459406][ T8922] tcp_sendmsg+0x35/0x50 [ 94.463637][ T8922] inet_sendmsg+0x69/0x90 [ 94.467945][ T8922] sock_sendmsg+0x98/0xc0 [ 94.472250][ T8922] sock_write_iter+0x186/0x240 [ 94.477002][ T8922] new_sync_write+0x303/0x400 [ 94.481666][ T8922] __vfs_write+0x9e/0xb0 [ 94.485896][ T8922] vfs_write+0x189/0x380 [ 94.490122][ T8922] ksys_write+0x16a/0x1a0 [ 94.494438][ T8922] __x64_sys_write+0x49/0x60 [ 94.499004][ T8922] do_syscall_64+0xc7/0x3b0 [ 94.503482][ T8922] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 94.509341][ T8922] [ 94.511655][ T8922] Reported by Kernel Concurrency Sanitizer on: [ 94.517795][ T8922] CPU: 0 PID: 8922 Comm: syz-fuzzer Not tainted 5.7.0-rc1-syzkaller #0 [ 94.526010][ T8922] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 94.536050][ T8922] ================================================================== [ 94.544086][ T8922] Kernel panic - not syncing: panic_on_warn set ... [ 94.550659][ T8922] CPU: 0 PID: 8922 Comm: syz-fuzzer Not tainted 5.7.0-rc1-syzkaller #0 [ 94.558879][ T8922] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 94.568920][ T8922] Call Trace: [ 94.572218][ T8922] dump_stack+0x11d/0x187 [ 94.576538][ T8922] panic+0x210/0x640 [ 94.580413][ T8922] ? vprintk_func+0x89/0x13a [ 94.584992][ T8922] kcsan_report.cold+0xc/0x1a [ 94.589651][ T8922] kcsan_setup_watchpoint+0x3fb/0x440 [ 94.595009][ T8922] mod_timer+0x631/0x830 [ 94.599234][ T8922] sk_reset_timer+0x29/0xc0 [ 94.603727][ T8922] tcp_rearm_rto+0x1ce/0x280 [ 94.608317][ T8922] tcp_event_new_data_sent+0x23f/0x260 [ 94.613810][ T8922] tcp_write_xmit+0x5c6/0x31e0 [ 94.618562][ T8922] ? iov_iter_advance+0x21c/0x900 [ 94.623584][ T8922] __tcp_push_pending_frames+0x72/0x1b0 [ 94.629146][ T8922] tcp_push+0x1ec/0x3e0 [ 94.633286][ T8922] tcp_sendmsg_locked+0x1de3/0x20f0 [ 94.638467][ T8922] ? aa_label_sk_perm.part.0+0x220/0x290 [ 94.644113][ T8922] tcp_sendmsg+0x35/0x50 [ 94.648345][ T8922] inet_sendmsg+0x69/0x90 [ 94.652667][ T8922] ? inet_send_prepare+0x1f0/0x1f0 [ 94.657783][ T8922] sock_sendmsg+0x98/0xc0 [ 94.662090][ T8922] sock_write_iter+0x186/0x240 [ 94.666854][ T8922] new_sync_write+0x303/0x400 [ 94.671529][ T8922] __vfs_write+0x9e/0xb0 [ 94.675748][ T8922] vfs_write+0x189/0x380 [ 94.679988][ T8922] ksys_write+0x16a/0x1a0 [ 94.684314][ T8922] __x64_sys_write+0x49/0x60 [ 94.688924][ T8922] do_syscall_64+0xc7/0x3b0 [ 94.693425][ T8922] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 94.699350][ T8922] RIP: 0033:0x4b3cdb [ 94.703253][ T8922] 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 [ 94.722848][ T8922] RSP: 002b:000000c0004dd540 EFLAGS: 00000202 ORIG_RAX: 0000000000000001 [ 94.731259][ T8922] RAX: ffffffffffffffda RBX: 000000c00002e800 RCX: 00000000004b3cdb [ 94.739240][ T8922] RDX: 0000000000000007 RSI: 000000c000344020 RDI: 0000000000000006 [ 94.747194][ T8922] RBP: 000000c0004dd590 R08: 000000c000344001 R09: 0000000000000007 [ 94.755153][ T8922] R10: 000000c000114000 R11: 0000000000000202 R12: 000000000000011e [ 94.763105][ T8922] R13: 000000c0003ca000 R14: 0000000000000007 R15: 000000000000886c [ 95.846416][ T8922] Shutting down cpus with NMI [ 95.852827][ T8922] Kernel Offset: disabled [ 95.857161][ T8922] Rebooting in 86400 seconds..