[ 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 '10.128.10.18' (ECDSA) to the list of known hosts. 2020/07/09 08:09:14 fuzzer started 2020/07/09 08:09:14 dialing manager at 10.128.0.105:45883 2020/07/09 08:09:16 syscalls: 3133 2020/07/09 08:09:16 code coverage: enabled 2020/07/09 08:09:16 comparison tracing: enabled 2020/07/09 08:09:16 extra coverage: enabled 2020/07/09 08:09:16 setuid sandbox: enabled 2020/07/09 08:09:16 namespace sandbox: enabled 2020/07/09 08:09:16 Android sandbox: /sys/fs/selinux/policy does not exist 2020/07/09 08:09:16 fault injection: enabled 2020/07/09 08:09:16 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2020/07/09 08:09:16 net packet injection: enabled 2020/07/09 08:09:16 net device setup: enabled 2020/07/09 08:09:16 concurrency sanitizer: enabled 2020/07/09 08:09:16 devlink PCI setup: PCI device 0000:00:10.0 is not available 2020/07/09 08:09:16 USB emulation: enabled 2020/07/09 08:09:18 suppressing KCSAN reports in functions: 'audit_log_start' '__add_to_page_cache_locked' 'do_epoll_wait' 'dd_has_work' 'generic_write_end' 'blk_mq_dispatch_rq_list' 'pcpu_alloc' 'n_tty_receive_buf_common' 'ext4_free_inodes_count' 'find_get_pages_range_tag' 'ext4_mark_iloc_dirty' 'ext4_writepages' 'blk_mq_rq_ctx_init' 'futex_wait_queue_me' '__ext4_new_inode' '__delayacct_blkio_end' 'expire_timers' 'ext4_free_inode' 'do_nanosleep' '__xa_clear_mark' 'blk_mq_sched_dispatch_requests' 'page_counter_charge' syzkaller login: [ 55.835360][ T8646] ================================================================== [ 55.843487][ T8646] BUG: KCSAN: data-race in __mod_timer / timer_clear_idle [ 55.850590][ T8646] [ 55.852892][ T8646] write to 0xffff88812c01cb24 of 1 bytes by task 0 on cpu 0: [ 55.860227][ T8646] timer_clear_idle+0x2e/0x40 [ 55.864871][ T8646] tick_nohz_idle_retain_tick+0x3e/0x40 [ 55.870402][ T8646] do_idle+0x287/0x310 [ 55.874439][ T8646] cpu_startup_entry+0x15/0x20 [ 55.879183][ T8646] rest_init+0xd8/0xe0 [ 55.883220][ T8646] arch_call_rest_init+0xa/0xb [ 55.887951][ T8646] start_kernel+0x608/0x6d0 [ 55.892421][ T8646] secondary_startup_64+0xa4/0xb0 [ 55.897410][ T8646] [ 55.899725][ T8646] read to 0xffff88812c01cb24 of 1 bytes by task 8646 on cpu 1: [ 55.907232][ T8646] __mod_timer+0xb87/0xf00 [ 55.911616][ T8646] mod_timer+0x1b/0x20 [ 55.915653][ T8646] sk_reset_timer+0x1f/0xa0 [ 55.920210][ T8646] tcp_rearm_rto+0x204/0x210 [ 55.924793][ T8646] tcp_write_xmit+0x1bee/0x3f40 [ 55.929641][ T8646] __tcp_push_pending_frames+0x68/0x1c0 [ 55.935158][ T8646] tcp_push+0x2da/0x2f0 [ 55.939279][ T8646] tcp_sendmsg_locked+0x1bf9/0x2200 [ 55.944449][ T8646] tcp_sendmsg+0x2c/0x40 [ 55.948670][ T8646] inet_sendmsg+0x5f/0x80 [ 55.952967][ T8646] sock_write_iter+0x1a1/0x200 [ 55.957697][ T8646] __vfs_write+0x2d8/0x340 [ 55.962078][ T8646] vfs_write+0x19b/0x350 [ 55.966298][ T8646] ksys_write+0xce/0x180 [ 55.970508][ T8646] __x64_sys_write+0x3e/0x50 [ 55.975065][ T8646] do_syscall_64+0x51/0xb0 [ 55.979454][ T8646] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 55.985305][ T8646] [ 55.987617][ T8646] Reported by Kernel Concurrency Sanitizer on: [ 55.993737][ T8646] CPU: 1 PID: 8646 Comm: syz-fuzzer Not tainted 5.8.0-rc4-syzkaller #0 [ 56.001950][ T8646] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 56.011988][ T8646] ================================================================== [ 56.020016][ T8646] Kernel panic - not syncing: panic_on_warn set ... [ 56.026567][ T8646] CPU: 1 PID: 8646 Comm: syz-fuzzer Not tainted 5.8.0-rc4-syzkaller #0 [ 56.034767][ T8646] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 56.044787][ T8646] Call Trace: [ 56.048061][ T8646] dump_stack+0x10f/0x19d [ 56.052358][ T8646] panic+0x207/0x64a [ 56.056221][ T8646] ? vprintk_emit+0x44a/0x4f0 [ 56.060866][ T8646] kcsan_report+0x684/0x690 [ 56.065338][ T8646] ? kcsan_setup_watchpoint+0x453/0x4d0 [ 56.070850][ T8646] ? __mod_timer+0xb87/0xf00 [ 56.075419][ T8646] ? mod_timer+0x1b/0x20 [ 56.079633][ T8646] ? sk_reset_timer+0x1f/0xa0 [ 56.084275][ T8646] ? tcp_rearm_rto+0x204/0x210 [ 56.089006][ T8646] ? tcp_write_xmit+0x1bee/0x3f40 [ 56.094008][ T8646] ? __tcp_push_pending_frames+0x68/0x1c0 [ 56.099693][ T8646] ? tcp_push+0x2da/0x2f0 [ 56.103989][ T8646] ? tcp_sendmsg_locked+0x1bf9/0x2200 [ 56.109337][ T8646] ? tcp_sendmsg+0x2c/0x40 [ 56.113720][ T8646] ? inet_sendmsg+0x5f/0x80 [ 56.118189][ T8646] ? sock_write_iter+0x1a1/0x200 [ 56.123108][ T8646] ? __vfs_write+0x2d8/0x340 [ 56.127665][ T8646] ? vfs_write+0x19b/0x350 [ 56.132048][ T8646] ? ksys_write+0xce/0x180 [ 56.136430][ T8646] ? __x64_sys_write+0x3e/0x50 [ 56.141178][ T8646] ? do_syscall_64+0x51/0xb0 [ 56.145736][ T8646] ? entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 56.151772][ T8646] ? __ip_queue_xmit+0x9ba/0x9e0 [ 56.156690][ T8646] ? __copy_skb_header+0x228/0x270 [ 56.161782][ T8646] kcsan_setup_watchpoint+0x453/0x4d0 [ 56.167121][ T8646] __mod_timer+0xb87/0xf00 [ 56.171508][ T8646] mod_timer+0x1b/0x20 [ 56.175560][ T8646] sk_reset_timer+0x1f/0xa0 [ 56.180042][ T8646] tcp_rearm_rto+0x204/0x210 [ 56.184600][ T8646] tcp_write_xmit+0x1bee/0x3f40 [ 56.189421][ T8646] ? _raw_spin_unlock_irqrestore+0x53/0x70 [ 56.195196][ T8646] ? check_preemption_disabled+0x51/0x140 [ 56.200967][ T8646] ? iov_iter_advance+0x1e0/0x890 [ 56.205958][ T8646] ? _copy_from_iter_full+0x1d9/0x6d0 [ 56.211298][ T8646] __tcp_push_pending_frames+0x68/0x1c0 [ 56.216838][ T8646] tcp_push+0x2da/0x2f0 [ 56.220978][ T8646] tcp_sendmsg_locked+0x1bf9/0x2200 [ 56.226193][ T8646] tcp_sendmsg+0x2c/0x40 [ 56.230400][ T8646] inet_sendmsg+0x5f/0x80 [ 56.234698][ T8646] sock_write_iter+0x1a1/0x200 [ 56.239471][ T8646] __vfs_write+0x2d8/0x340 [ 56.243885][ T8646] vfs_write+0x19b/0x350 [ 56.248099][ T8646] ksys_write+0xce/0x180 [ 56.252344][ T8646] __x64_sys_write+0x3e/0x50 [ 56.256928][ T8646] do_syscall_64+0x51/0xb0 [ 56.261315][ T8646] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 56.267174][ T8646] RIP: 0033:0x4b3cdb [ 56.271032][ T8646] Code: Bad RIP value. [ 56.275069][ T8646] RSP: 002b:000000c0004b9540 EFLAGS: 00000202 ORIG_RAX: 0000000000000001 [ 56.283449][ T8646] RAX: ffffffffffffffda RBX: 000000c00002c000 RCX: 00000000004b3cdb [ 56.291389][ T8646] RDX: 0000000000000007 RSI: 000000c00000a200 RDI: 0000000000000006 [ 56.299327][ T8646] RBP: 000000c0004b9590 R08: 000000c00000a201 R09: 0000000000000007 [ 56.307292][ T8646] R10: 000000c0000c6000 R11: 0000000000000202 R12: 000000000000011e [ 56.315259][ T8646] R13: 000000c00032a000 R14: 0000000000000007 R15: 0000000000001bb2 [ 57.424714][ T8646] Shutting down cpus with NMI [ 57.430531][ T8646] Kernel Offset: disabled [ 57.434838][ T8646] Rebooting in 86400 seconds..