[ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... Starting Load/Save RF Kill Switch Status... [ OK ] Started Update UTMP about System Runlevel Changes. [ OK ] Started Load/Save RF Kill Switch Status. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.15' (ECDSA) to the list of known hosts. 2020/06/08 10:45:54 fuzzer started 2020/06/08 10:45:54 dialing manager at 10.128.0.105:38613 2020/06/08 10:45:57 syscalls: 3055 2020/06/08 10:45:57 code coverage: enabled 2020/06/08 10:45:57 comparison tracing: enabled 2020/06/08 10:45:57 extra coverage: enabled 2020/06/08 10:45:57 setuid sandbox: enabled 2020/06/08 10:45:57 namespace sandbox: enabled 2020/06/08 10:45:57 Android sandbox: /sys/fs/selinux/policy does not exist 2020/06/08 10:45:57 fault injection: enabled 2020/06/08 10:45:57 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2020/06/08 10:45:57 net packet injection: enabled 2020/06/08 10:45:57 net device setup: enabled 2020/06/08 10:45:57 concurrency sanitizer: enabled 2020/06/08 10:45:57 devlink PCI setup: PCI device 0000:00:10.0 is not available 2020/06/08 10:45:57 USB emulation: enabled syzkaller login: [ 55.004213][ T8906] KCSAN: could not find function: '_find_next_bit' 2020/06/08 10:45:59 adding functions to KCSAN blacklist: '_find_next_bit' 'copy_process' 'find_get_pages_range_tag' 'do_nanosleep' 'tick_sched_do_timer' 'blk_mq_dispatch_rq_list' 'ep_poll' '__ext4_new_inode' 'ktime_get_real_seconds' [ 76.865703][ T8907] ================================================================== [ 76.873868][ T8907] BUG: KCSAN: data-race in mod_timer / timer_clear_idle [ 76.880798][ T8907] [ 76.883136][ T8907] write to 0xffff88812c01dca4 of 1 bytes by task 0 on cpu 0: [ 76.890487][ T8907] timer_clear_idle+0x3d/0x50 [ 76.895159][ T8907] __tick_nohz_idle_restart_tick+0x32/0x1a0 [ 76.901047][ T8907] tick_nohz_idle_exit+0x19c/0x1d0 [ 76.906143][ T8907] do_idle+0xac/0x290 [ 76.910112][ T8907] cpu_startup_entry+0x14/0x20 [ 76.914860][ T8907] rest_init+0xe4/0xeb [ 76.918908][ T8907] arch_call_rest_init+0x13/0x2b [ 76.923822][ T8907] start_kernel+0x7fe/0x823 [ 76.928304][ T8907] secondary_startup_64+0xa4/0xb0 [ 76.933300][ T8907] [ 76.935609][ T8907] read to 0xffff88812c01dca4 of 1 bytes by task 8907 on cpu 1: [ 76.943133][ T8907] mod_timer+0x631/0x830 [ 76.947354][ T8907] sk_reset_timer+0x29/0xc0 [ 76.951834][ T8907] tcp_rearm_rto+0x1ce/0x280 [ 76.956402][ T8907] tcp_event_new_data_sent+0x23f/0x260 [ 76.961840][ T8907] tcp_write_xmit+0x5c6/0x31e0 [ 76.966584][ T8907] __tcp_push_pending_frames+0x72/0x1b0 [ 76.972118][ T8907] tcp_push+0x1ec/0x3e0 [ 76.976263][ T8907] tcp_sendmsg_locked+0x1de3/0x20f0 [ 76.981436][ T8907] tcp_sendmsg+0x35/0x50 [ 76.985655][ T8907] inet_sendmsg+0x69/0x90 [ 76.989975][ T8907] sock_sendmsg+0x98/0xc0 [ 76.994459][ T8907] sock_write_iter+0x186/0x240 [ 76.999200][ T8907] new_sync_write+0x303/0x400 [ 77.003868][ T8907] __vfs_write+0x9e/0xb0 [ 77.008085][ T8907] vfs_write+0x189/0x380 [ 77.012303][ T8907] ksys_write+0x16a/0x1a0 [ 77.016619][ T8907] __x64_sys_write+0x49/0x60 [ 77.021360][ T8907] do_syscall_64+0xc7/0x3b0 [ 77.025839][ T8907] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 77.031698][ T8907] [ 77.034012][ T8907] Reported by Kernel Concurrency Sanitizer on: [ 77.040157][ T8907] CPU: 1 PID: 8907 Comm: syz-fuzzer Not tainted 5.7.0-rc1-syzkaller #0 [ 77.048364][ T8907] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 77.058392][ T8907] ================================================================== [ 77.066451][ T8907] Kernel panic - not syncing: panic_on_warn set ... [ 77.073017][ T8907] CPU: 1 PID: 8907 Comm: syz-fuzzer Not tainted 5.7.0-rc1-syzkaller #0 [ 77.081223][ T8907] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 77.092813][ T8907] Call Trace: [ 77.096086][ T8907] dump_stack+0x11d/0x187 [ 77.100402][ T8907] panic+0x210/0x640 [ 77.104366][ T8907] ? vprintk_func+0x89/0x13a [ 77.108933][ T8907] kcsan_report.cold+0xc/0x1a [ 77.113593][ T8907] kcsan_setup_watchpoint+0x3fb/0x440 [ 77.119218][ T8907] mod_timer+0x631/0x830 [ 77.123458][ T8907] sk_reset_timer+0x29/0xc0 [ 77.127941][ T8907] tcp_rearm_rto+0x1ce/0x280 [ 77.132526][ T8907] tcp_event_new_data_sent+0x23f/0x260 [ 77.137975][ T8907] tcp_write_xmit+0x5c6/0x31e0 [ 77.142741][ T8907] ? iov_iter_advance+0x21c/0x900 [ 77.148007][ T8907] __tcp_push_pending_frames+0x72/0x1b0 [ 77.153533][ T8907] tcp_push+0x1ec/0x3e0 [ 77.157669][ T8907] tcp_sendmsg_locked+0x1de3/0x20f0 [ 77.162938][ T8907] ? aa_label_sk_perm.part.0+0x220/0x290 [ 77.168569][ T8907] tcp_sendmsg+0x35/0x50 [ 77.172789][ T8907] inet_sendmsg+0x69/0x90 [ 77.177098][ T8907] ? inet_send_prepare+0x1f0/0x1f0 [ 77.182185][ T8907] sock_sendmsg+0x98/0xc0 [ 77.186532][ T8907] sock_write_iter+0x186/0x240 [ 77.191288][ T8907] new_sync_write+0x303/0x400 [ 77.195964][ T8907] __vfs_write+0x9e/0xb0 [ 77.200184][ T8907] vfs_write+0x189/0x380 [ 77.204519][ T8907] ksys_write+0x16a/0x1a0 [ 77.208828][ T8907] __x64_sys_write+0x49/0x60 [ 77.213404][ T8907] do_syscall_64+0xc7/0x3b0 [ 77.217893][ T8907] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 77.223766][ T8907] RIP: 0033:0x4b3cdb [ 77.227661][ T8907] 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 [ 77.247243][ T8907] RSP: 002b:000000c000599540 EFLAGS: 00000202 ORIG_RAX: 0000000000000001 [ 77.255632][ T8907] RAX: ffffffffffffffda RBX: 000000c00002e800 RCX: 00000000004b3cdb [ 77.263595][ T8907] RDX: 0000000000000008 RSI: 000000c00000a200 RDI: 0000000000000006 [ 77.271559][ T8907] RBP: 000000c000599590 R08: 000000c00000a201 R09: 0000000000000008 [ 77.279510][ T8907] R10: 000000c0000d4000 R11: 0000000000000202 R12: 000000000000011e [ 77.287457][ T8907] R13: 000000c000280000 R14: 0000000000000007 R15: 000000000000211d [ 78.370463][ T8907] Shutting down cpus with NMI [ 78.376535][ T8907] Kernel Offset: disabled [ 78.380854][ T8907] Rebooting in 86400 seconds..