[ 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 '10.128.0.82' (ECDSA) to the list of known hosts. 2020/06/05 14:41:24 fuzzer started 2020/06/05 14:41:25 dialing manager at 10.128.0.105:41441 2020/06/05 14:41:32 syscalls: 3055 2020/06/05 14:41:32 code coverage: enabled 2020/06/05 14:41:32 comparison tracing: enabled 2020/06/05 14:41:32 extra coverage: enabled 2020/06/05 14:41:32 setuid sandbox: enabled 2020/06/05 14:41:32 namespace sandbox: enabled 2020/06/05 14:41:32 Android sandbox: /sys/fs/selinux/policy does not exist 2020/06/05 14:41:32 fault injection: enabled 2020/06/05 14:41:32 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2020/06/05 14:41:32 net packet injection: enabled 2020/06/05 14:41:32 net device setup: enabled 2020/06/05 14:41:32 concurrency sanitizer: enabled 2020/06/05 14:41:32 devlink PCI setup: PCI device 0000:00:10.0 is not available 2020/06/05 14:41:32 USB emulation: enabled syzkaller login: [ 55.936802][ T8918] KCSAN: could not find function: '_find_next_bit' 2020/06/05 14:41:35 adding functions to KCSAN blacklist: '_find_next_bit' 'file_update_time' 'blk_mq_get_request' 'add_timer' 'generic_fillattr' '__perf_event_overflow' 'ext4_free_inodes_count' 'blk_mq_dispatch_rq_list' 'futex_wait_queue_me' 'ep_poll' 'generic_write_end' 'find_get_pages_range_tag' 'dd_has_work' 'page_counter_charge' 'xas_clear_mark' 'do_syslog' 'wbt_done' 'run_timer_softirq' 'do_nanosleep' '__ext4_new_inode' 'blk_mq_sched_dispatch_requests' 'tick_sched_do_timer' 'kauditd_thread' 'copy_process' [ 130.458613][ T8909] ================================================================== [ 130.466767][ T8909] BUG: KCSAN: data-race in mod_timer / timer_clear_idle [ 130.473694][ T8909] [ 130.476002][ T8909] write to 0xffff88812c01dca4 of 1 bytes by task 0 on cpu 0: [ 130.483349][ T8909] timer_clear_idle+0x3d/0x50 [ 130.488006][ T8909] __tick_nohz_idle_restart_tick+0x32/0x1a0 [ 130.493876][ T8909] tick_nohz_idle_exit+0x19c/0x1d0 [ 130.498961][ T8909] do_idle+0xac/0x290 [ 130.503378][ T8909] cpu_startup_entry+0x14/0x20 [ 130.508850][ T8909] rest_init+0xe4/0xeb [ 130.512916][ T8909] arch_call_rest_init+0x13/0x2b [ 130.517830][ T8909] start_kernel+0x7fe/0x823 [ 130.522317][ T8909] secondary_startup_64+0xa4/0xb0 [ 130.527320][ T8909] [ 130.529730][ T8909] read to 0xffff88812c01dca4 of 1 bytes by task 8909 on cpu 1: [ 130.537253][ T8909] mod_timer+0x631/0x830 [ 130.541470][ T8909] sk_reset_timer+0x29/0xc0 [ 130.545958][ T8909] tcp_rearm_rto+0x1ce/0x280 [ 130.550524][ T8909] tcp_event_new_data_sent+0x23f/0x260 [ 130.555957][ T8909] tcp_write_xmit+0x5c6/0x31e0 [ 130.560700][ T8909] __tcp_push_pending_frames+0x72/0x1b0 [ 130.566225][ T8909] tcp_push+0x1ec/0x3e0 [ 130.570357][ T8909] tcp_sendmsg_locked+0x1de3/0x20f0 [ 130.575563][ T8909] tcp_sendmsg+0x35/0x50 [ 130.579779][ T8909] inet_sendmsg+0x69/0x90 [ 130.584083][ T8909] sock_sendmsg+0x98/0xc0 [ 130.588385][ T8909] sock_write_iter+0x186/0x240 [ 130.593124][ T8909] new_sync_write+0x303/0x400 [ 130.598296][ T8909] __vfs_write+0x9e/0xb0 [ 130.602599][ T8909] vfs_write+0x189/0x380 [ 130.606826][ T8909] ksys_write+0x16a/0x1a0 [ 130.611221][ T8909] __x64_sys_write+0x49/0x60 [ 130.616233][ T8909] do_syscall_64+0xc7/0x3b0 [ 130.620712][ T8909] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 130.626574][ T8909] [ 130.628875][ T8909] Reported by Kernel Concurrency Sanitizer on: [ 130.635004][ T8909] CPU: 1 PID: 8909 Comm: syz-fuzzer Not tainted 5.7.0-rc1-syzkaller #0 [ 130.643211][ T8909] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 130.653255][ T8909] ================================================================== [ 130.661311][ T8909] Kernel panic - not syncing: panic_on_warn set ... [ 130.667879][ T8909] CPU: 1 PID: 8909 Comm: syz-fuzzer Not tainted 5.7.0-rc1-syzkaller #0 [ 130.676261][ T8909] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 130.686287][ T8909] Call Trace: [ 130.689649][ T8909] dump_stack+0x11d/0x187 [ 130.693959][ T8909] panic+0x210/0x640 [ 130.697834][ T8909] ? vprintk_func+0x89/0x13a [ 130.702399][ T8909] kcsan_report.cold+0xc/0x1a [ 130.707057][ T8909] kcsan_setup_watchpoint+0x3fb/0x440 [ 130.712409][ T8909] mod_timer+0x631/0x830 [ 130.717008][ T8909] sk_reset_timer+0x29/0xc0 [ 130.721554][ T8909] tcp_rearm_rto+0x1ce/0x280 [ 130.726134][ T8909] tcp_event_new_data_sent+0x23f/0x260 [ 130.731577][ T8909] tcp_write_xmit+0x5c6/0x31e0 [ 130.736422][ T8909] ? iov_iter_advance+0x21c/0x900 [ 130.741436][ T8909] __tcp_push_pending_frames+0x72/0x1b0 [ 130.746963][ T8909] tcp_push+0x1ec/0x3e0 [ 130.751223][ T8909] tcp_sendmsg_locked+0x1de3/0x20f0 [ 130.756403][ T8909] ? aa_label_sk_perm.part.0+0x220/0x290 [ 130.762044][ T8909] tcp_sendmsg+0x35/0x50 [ 130.766277][ T8909] inet_sendmsg+0x69/0x90 [ 130.770591][ T8909] ? inet_send_prepare+0x1f0/0x1f0 [ 130.775706][ T8909] sock_sendmsg+0x98/0xc0 [ 130.780013][ T8909] sock_write_iter+0x186/0x240 [ 130.784945][ T8909] new_sync_write+0x303/0x400 [ 130.789626][ T8909] __vfs_write+0x9e/0xb0 [ 130.793849][ T8909] vfs_write+0x189/0x380 [ 130.798100][ T8909] ksys_write+0x16a/0x1a0 [ 130.802675][ T8909] __x64_sys_write+0x49/0x60 [ 130.807249][ T8909] do_syscall_64+0xc7/0x3b0 [ 130.811733][ T8909] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 130.817642][ T8909] RIP: 0033:0x4b3cdb [ 130.821616][ T8909] 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 [ 130.841471][ T8909] RSP: 002b:000000c00bc51540 EFLAGS: 00000202 ORIG_RAX: 0000000000000001 [ 130.849871][ T8909] RAX: ffffffffffffffda RBX: 000000c00002c000 RCX: 00000000004b3cdb [ 130.857820][ T8909] RDX: 0000000000000007 RSI: 000000c00000a3e0 RDI: 0000000000000006 [ 130.865766][ T8909] RBP: 000000c00bc51590 R08: 000000c00000a301 R09: 0000000000000007 [ 130.873798][ T8909] R10: 000000c000112000 R11: 0000000000000202 R12: 000000000000011e [ 130.881743][ T8909] R13: 000000c0003de000 R14: 0000000000000007 R15: 00000000000055d2 [ 131.966787][ T8909] Shutting down cpus with NMI [ 131.973190][ T8909] Kernel Offset: disabled [ 131.977520][ T8909] Rebooting in 86400 seconds..