[  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 '10.128.1.61' (ECDSA) to the list of known hosts.
2020/06/06 01:47:00 fuzzer started
2020/06/06 01:47:00 dialing manager at 10.128.0.105:35423
2020/06/06 01:47:00 syscalls: 3055
2020/06/06 01:47:00 code coverage: enabled
2020/06/06 01:47:00 comparison tracing: enabled
2020/06/06 01:47:00 extra coverage: enabled
2020/06/06 01:47:00 setuid sandbox: enabled
2020/06/06 01:47:00 namespace sandbox: enabled
2020/06/06 01:47:00 Android sandbox: /sys/fs/selinux/policy does not exist
2020/06/06 01:47:00 fault injection: enabled
2020/06/06 01:47:00 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled
2020/06/06 01:47:00 net packet injection: enabled
2020/06/06 01:47:00 net device setup: enabled
2020/06/06 01:47:00 concurrency sanitizer: enabled
2020/06/06 01:47:00 devlink PCI setup: PCI device 0000:00:10.0 is not available
2020/06/06 01:47:00 USB emulation: enabled
syzkaller login: [   52.835570][ T8907] KCSAN: could not find function: '_find_next_bit'
2020/06/06 01:47:02 adding functions to KCSAN blacklist: 'wbt_done' 'futex_wait_queue_me' 'dd_has_work' 'run_timer_softirq' 'generic_write_end' '_find_next_bit' 'copy_process' 'shmem_file_read_iter' 'blk_mq_request_bypass_insert' 'find_get_pages_range_tag' 'ep_poll' '__send_signal' '__mark_inode_dirty' 'alloc_pid' 
[   88.280073][ T8896] ==================================================================
[   88.288205][ T8896] BUG: KCSAN: data-race in mod_timer / timer_clear_idle
[   88.295220][ T8896] 
[   88.297535][ T8896] write to 0xffff88812c01dca4 of 1 bytes by task 0 on cpu 0:
[   88.305030][ T8896]  timer_clear_idle+0x3d/0x50
[   88.309714][ T8896]  __tick_nohz_idle_restart_tick+0x32/0x1a0
[   88.315606][ T8896]  tick_nohz_idle_exit+0x19c/0x1d0
[   88.320704][ T8896]  do_idle+0xac/0x290
[   88.324664][ T8896]  cpu_startup_entry+0x14/0x20
[   88.329416][ T8896]  rest_init+0xe4/0xeb
[   88.333477][ T8896]  arch_call_rest_init+0x13/0x2b
[   88.338579][ T8896]  start_kernel+0x7fe/0x823
[   88.343068][ T8896]  secondary_startup_64+0xa4/0xb0
[   88.348063][ T8896] 
[   88.350386][ T8896] read to 0xffff88812c01dca4 of 1 bytes by task 8896 on cpu 1:
[   88.357991][ T8896]  mod_timer+0x631/0x830
[   88.362224][ T8896]  sk_reset_timer+0x29/0xc0
[   88.366753][ T8896]  tcp_rearm_rto+0x1ce/0x280
[   88.371331][ T8896]  tcp_event_new_data_sent+0x23f/0x260
[   88.377362][ T8896]  tcp_write_xmit+0x5c6/0x31e0
[   88.382109][ T8896]  __tcp_push_pending_frames+0x72/0x1b0
[   88.387647][ T8896]  tcp_push+0x1ec/0x3e0
[   88.391781][ T8896]  tcp_sendmsg_locked+0x1de3/0x20f0
[   88.397069][ T8896]  tcp_sendmsg+0x35/0x50
[   88.401382][ T8896]  inet_sendmsg+0x69/0x90
[   88.405691][ T8896]  sock_sendmsg+0x98/0xc0
[   88.409997][ T8896]  sock_write_iter+0x186/0x240
[   88.414749][ T8896]  new_sync_write+0x303/0x400
[   88.419401][ T8896]  __vfs_write+0x9e/0xb0
[   88.423908][ T8896]  vfs_write+0x189/0x380
[   88.428267][ T8896]  ksys_write+0x16a/0x1a0
[   88.432574][ T8896]  __x64_sys_write+0x49/0x60
[   88.437233][ T8896]  do_syscall_64+0xc7/0x3b0
[   88.441734][ T8896]  entry_SYSCALL_64_after_hwframe+0x44/0xa9
[   88.447601][ T8896] 
[   88.449938][ T8896] Reported by Kernel Concurrency Sanitizer on:
[   88.456264][ T8896] CPU: 1 PID: 8896 Comm: syz-fuzzer Not tainted 5.7.0-rc1-syzkaller #0
[   88.464564][ T8896] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   88.474806][ T8896] ==================================================================
[   88.483150][ T8896] Kernel panic - not syncing: panic_on_warn set ...
[   88.489742][ T8896] CPU: 1 PID: 8896 Comm: syz-fuzzer Not tainted 5.7.0-rc1-syzkaller #0
[   88.497961][ T8896] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   88.508099][ T8896] Call Trace:
[   88.511396][ T8896]  dump_stack+0x11d/0x187
[   88.515718][ T8896]  panic+0x210/0x640
[   88.519598][ T8896]  ? vprintk_func+0x89/0x13a
[   88.524167][ T8896]  kcsan_report.cold+0xc/0x1a
[   88.528826][ T8896]  kcsan_setup_watchpoint+0x3fb/0x440
[   88.534177][ T8896]  mod_timer+0x631/0x830
[   88.538505][ T8896]  sk_reset_timer+0x29/0xc0
[   88.543002][ T8896]  tcp_rearm_rto+0x1ce/0x280
[   88.547610][ T8896]  tcp_event_new_data_sent+0x23f/0x260
[   88.553055][ T8896]  tcp_write_xmit+0x5c6/0x31e0
[   88.557827][ T8896]  ? iov_iter_advance+0x21c/0x900
[   88.562838][ T8896]  __tcp_push_pending_frames+0x72/0x1b0
[   88.568376][ T8896]  tcp_push+0x1ec/0x3e0
[   88.572530][ T8896]  tcp_sendmsg_locked+0x1de3/0x20f0
[   88.577731][ T8896]  ? aa_label_sk_perm.part.0+0x220/0x290
[   88.583345][ T8896]  tcp_sendmsg+0x35/0x50
[   88.587566][ T8896]  inet_sendmsg+0x69/0x90
[   88.591885][ T8896]  ? inet_send_prepare+0x1f0/0x1f0
[   88.597003][ T8896]  sock_sendmsg+0x98/0xc0
[   88.601323][ T8896]  sock_write_iter+0x186/0x240
[   88.606096][ T8896]  new_sync_write+0x303/0x400
[   88.610944][ T8896]  __vfs_write+0x9e/0xb0
[   88.615176][ T8896]  vfs_write+0x189/0x380
[   88.619400][ T8896]  ksys_write+0x16a/0x1a0
[   88.623720][ T8896]  __x64_sys_write+0x49/0x60
[   88.628379][ T8896]  do_syscall_64+0xc7/0x3b0
[   88.632870][ T8896]  entry_SYSCALL_64_after_hwframe+0x44/0xa9
[   88.638739][ T8896] RIP: 0033:0x4b3cdb
[   88.642617][ T8896] 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
[   88.662196][ T8896] RSP: 002b:000000c000589540 EFLAGS: 00000202 ORIG_RAX: 0000000000000001
[   88.670665][ T8896] RAX: ffffffffffffffda RBX: 000000c00002e800 RCX: 00000000004b3cdb
[   88.678711][ T8896] RDX: 0000000000000007 RSI: 000000c00000a3e0 RDI: 0000000000000006
[   88.686736][ T8896] RBP: 000000c000589590 R08: 000000c00000a301 R09: 0000000000000007
[   88.694690][ T8896] R10: 000000c0000c4000 R11: 0000000000000202 R12: 000000000000011e
[   88.703336][ T8896] R13: 000000c000288000 R14: 0000000000000007 R15: 0000000000000d20
[   89.788168][ T8896] Shutting down cpus with NMI
[   89.794510][ T8896] Kernel Offset: disabled
[   89.798827][ T8896] Rebooting in 86400 seconds..