[ 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 '10.128.1.32' (ECDSA) to the list of known hosts. 2020/05/28 12:36:13 fuzzer started 2020/05/28 12:36:14 dialing manager at 10.128.0.105:45675 2020/05/28 12:36:15 syscalls: 3055 2020/05/28 12:36:15 code coverage: enabled 2020/05/28 12:36:15 comparison tracing: enabled 2020/05/28 12:36:15 extra coverage: enabled 2020/05/28 12:36:15 setuid sandbox: enabled 2020/05/28 12:36:15 namespace sandbox: enabled 2020/05/28 12:36:15 Android sandbox: /sys/fs/selinux/policy does not exist 2020/05/28 12:36:15 fault injection: enabled 2020/05/28 12:36:15 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2020/05/28 12:36:15 net packet injection: enabled 2020/05/28 12:36:15 net device setup: enabled 2020/05/28 12:36:15 concurrency sanitizer: enabled 2020/05/28 12:36:15 devlink PCI setup: PCI device 0000:00:10.0 is not available 2020/05/28 12:36:15 USB emulation: enabled 2020/05/28 12:36:16 adding functions to KCSAN blacklist: 'ep_poll' 'blk_mq_dispatch_rq_list' 'find_get_pages_range_tag' '__ext4_new_inode' 'echo_char' 'xas_clear_mark' '__send_signal' 'run_timer_softirq' 'page_counter_charge' syzkaller login: [ 64.451587][ T8893] ================================================================== [ 64.461270][ T8893] BUG: KCSAN: data-race in mod_timer / timer_clear_idle [ 64.468301][ T8893] [ 64.470616][ T8893] write to 0xffff88812c01dca4 of 1 bytes by task 0 on cpu 0: [ 64.478844][ T8893] timer_clear_idle+0x3d/0x50 [ 64.483507][ T8893] __tick_nohz_idle_restart_tick+0x32/0x1a0 [ 64.489391][ T8893] tick_nohz_idle_exit+0x19c/0x1d0 [ 64.494505][ T8893] do_idle+0xac/0x290 [ 64.498495][ T8893] cpu_startup_entry+0x14/0x20 [ 64.503245][ T8893] rest_init+0xe4/0xeb [ 64.507305][ T8893] arch_call_rest_init+0x13/0x2b [ 64.512232][ T8893] start_kernel+0x7fe/0x823 [ 64.517909][ T8893] secondary_startup_64+0xa4/0xb0 [ 64.522920][ T8893] [ 64.525251][ T8893] read to 0xffff88812c01dca4 of 1 bytes by task 8893 on cpu 1: [ 64.533005][ T8893] mod_timer+0x631/0x830 [ 64.537277][ T8893] sk_reset_timer+0x29/0xc0 [ 64.541768][ T8893] tcp_rearm_rto+0x1ce/0x280 [ 64.546355][ T8893] tcp_event_new_data_sent+0x23f/0x260 [ 64.551816][ T8893] tcp_write_xmit+0x5c6/0x31e0 [ 64.556578][ T8893] __tcp_push_pending_frames+0x72/0x1b0 [ 64.562099][ T8893] tcp_push+0x1ec/0x3e0 [ 64.566335][ T8893] tcp_sendmsg_locked+0x1de3/0x20f0 [ 64.571523][ T8893] tcp_sendmsg+0x35/0x50 [ 64.575816][ T8893] inet_sendmsg+0x69/0x90 [ 64.580149][ T8893] sock_sendmsg+0x98/0xc0 [ 64.584460][ T8893] sock_write_iter+0x186/0x240 [ 64.589211][ T8893] new_sync_write+0x303/0x400 [ 64.593866][ T8893] __vfs_write+0x9e/0xb0 [ 64.598083][ T8893] vfs_write+0x189/0x380 [ 64.602314][ T8893] ksys_write+0x16a/0x1a0 [ 64.606643][ T8893] __x64_sys_write+0x49/0x60 [ 64.611215][ T8893] do_syscall_64+0xc7/0x3b0 [ 64.615770][ T8893] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 64.621640][ T8893] [ 64.623962][ T8893] Reported by Kernel Concurrency Sanitizer on: [ 64.630302][ T8893] CPU: 1 PID: 8893 Comm: syz-fuzzer Not tainted 5.7.0-rc1-syzkaller #0 [ 64.640329][ T8893] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 64.650396][ T8893] ================================================================== [ 64.658437][ T8893] Kernel panic - not syncing: panic_on_warn set ... [ 64.665030][ T8893] CPU: 1 PID: 8893 Comm: syz-fuzzer Not tainted 5.7.0-rc1-syzkaller #0 [ 64.673379][ T8893] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 64.683507][ T8893] Call Trace: [ 64.686807][ T8893] dump_stack+0x11d/0x187 [ 64.691150][ T8893] panic+0x210/0x640 [ 64.695047][ T8893] ? vprintk_func+0x89/0x13a [ 64.699669][ T8893] kcsan_report.cold+0xc/0x1a [ 64.704334][ T8893] kcsan_setup_watchpoint+0x3fb/0x440 [ 64.709694][ T8893] mod_timer+0x631/0x830 [ 64.713925][ T8893] sk_reset_timer+0x29/0xc0 [ 64.718519][ T8893] tcp_rearm_rto+0x1ce/0x280 [ 64.723089][ T8893] tcp_event_new_data_sent+0x23f/0x260 [ 64.728550][ T8893] tcp_write_xmit+0x5c6/0x31e0 [ 64.733322][ T8893] ? iov_iter_advance+0x21c/0x900 [ 64.738359][ T8893] __tcp_push_pending_frames+0x72/0x1b0 [ 64.743899][ T8893] tcp_push+0x1ec/0x3e0 [ 64.748052][ T8893] tcp_sendmsg_locked+0x1de3/0x20f0 [ 64.753255][ T8893] ? aa_label_sk_perm.part.0+0x220/0x290 [ 64.758939][ T8893] tcp_sendmsg+0x35/0x50 [ 64.763190][ T8893] inet_sendmsg+0x69/0x90 [ 64.767658][ T8893] ? inet_send_prepare+0x1f0/0x1f0 [ 64.772856][ T8893] sock_sendmsg+0x98/0xc0 [ 64.777436][ T8893] sock_write_iter+0x186/0x240 [ 64.782211][ T8893] new_sync_write+0x303/0x400 [ 64.786898][ T8893] __vfs_write+0x9e/0xb0 [ 64.791121][ T8893] vfs_write+0x189/0x380 [ 64.795362][ T8893] ksys_write+0x16a/0x1a0 [ 64.799671][ T8893] __x64_sys_write+0x49/0x60 [ 64.804263][ T8893] do_syscall_64+0xc7/0x3b0 [ 64.808870][ T8893] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 64.814760][ T8893] RIP: 0033:0x4b3cdb [ 64.818650][ T8893] 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 [ 64.838527][ T8893] RSP: 002b:000000c0011b1540 EFLAGS: 00000202 ORIG_RAX: 0000000000000001 [ 64.846918][ T8893] RAX: ffffffffffffffda RBX: 000000c00002e800 RCX: 00000000004b3cdb [ 64.854962][ T8893] RDX: 0000000000000007 RSI: 000000c00000a3e0 RDI: 0000000000000006 [ 64.862929][ T8893] RBP: 000000c0011b1590 R08: 000000c00000a301 R09: 0000000000000007 [ 64.871094][ T8893] R10: 000000c000112000 R11: 0000000000000202 R12: 000000000000011e [ 64.879072][ T8893] R13: 000000c0001d4000 R14: 0000000000000007 R15: 0000000000000be0 [ 65.963925][ T8893] Shutting down cpus with NMI [ 65.969903][ T8893] Kernel Offset: disabled [ 65.974450][ T8893] Rebooting in 86400 seconds..