[  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 '10.128.0.178' (ECDSA) to the list of known hosts.
2020/05/26 01:34:40 fuzzer started
2020/05/26 01:34:40 dialing manager at 10.128.0.105:44363
2020/05/26 01:34:41 syscalls: 3055
2020/05/26 01:34:41 code coverage: enabled
2020/05/26 01:34:41 comparison tracing: enabled
2020/05/26 01:34:41 extra coverage: enabled
2020/05/26 01:34:41 setuid sandbox: enabled
2020/05/26 01:34:41 namespace sandbox: enabled
2020/05/26 01:34:41 Android sandbox: /sys/fs/selinux/policy does not exist
2020/05/26 01:34:41 fault injection: enabled
2020/05/26 01:34:41 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled
2020/05/26 01:34:41 net packet injection: enabled
2020/05/26 01:34:41 net device setup: enabled
2020/05/26 01:34:41 concurrency sanitizer: enabled
2020/05/26 01:34:41 devlink PCI setup: PCI device 0000:00:10.0 is not available
2020/05/26 01:34:41 USB emulation: enabled
syzkaller login: [   53.622956][ T8923] KCSAN: could not find function: '_find_next_bit'
2020/05/26 01:34:43 adding functions to KCSAN blacklist: 'find_get_pages_range_tag' 'vm_area_dup' 'run_timer_softirq' 'snd_rawmidi_kernel_write1' '__mark_inode_dirty' '_find_next_bit' 'dd_has_work' 'blk_mq_dispatch_rq_list' 'xas_clear_mark' 'copy_process' 'ep_poll' 'generic_write_end' 'generic_fillattr' 'page_counter_charge' 'shmem_getpage_gfp' 'blk_mq_get_request' 
[  107.854072][ T8912] ==================================================================
[  107.862191][ T8912] BUG: KCSAN: data-race in mod_timer / timer_clear_idle
[  107.869113][ T8912] 
[  107.871424][ T8912] write to 0xffff88812c01dca4 of 1 bytes by task 0 on cpu 0:
[  107.878775][ T8912]  timer_clear_idle+0x3d/0x50
[  107.883445][ T8912]  __tick_nohz_idle_restart_tick+0x32/0x1a0
[  107.889316][ T8912]  tick_nohz_idle_exit+0x19c/0x1d0
[  107.894403][ T8912]  do_idle+0xac/0x290
[  107.898363][ T8912]  cpu_startup_entry+0x14/0x20
[  107.903365][ T8912]  rest_init+0xe4/0xeb
[  107.907430][ T8912]  arch_call_rest_init+0x13/0x2b
[  107.912343][ T8912]  start_kernel+0x7fe/0x823
[  107.916825][ T8912]  secondary_startup_64+0xa4/0xb0
[  107.921816][ T8912] 
[  107.924125][ T8912] read to 0xffff88812c01dca4 of 1 bytes by task 8912 on cpu 1:
[  107.931645][ T8912]  mod_timer+0x631/0x830
[  107.935870][ T8912]  sk_reset_timer+0x29/0xc0
[  107.940354][ T8912]  tcp_rearm_rto+0x1ce/0x280
[  107.945095][ T8912]  tcp_event_new_data_sent+0x23f/0x260
[  107.950549][ T8912]  tcp_write_xmit+0x5c6/0x31e0
[  107.955293][ T8912]  __tcp_push_pending_frames+0x72/0x1b0
[  107.960811][ T8912]  tcp_push+0x1ec/0x3e0
[  107.964961][ T8912]  tcp_sendmsg_locked+0x1de3/0x20f0
[  107.970394][ T8912]  tcp_sendmsg+0x35/0x50
[  107.974613][ T8912]  inet_sendmsg+0x69/0x90
[  107.978939][ T8912]  sock_sendmsg+0x98/0xc0
[  107.983277][ T8912]  sock_write_iter+0x186/0x240
[  107.988046][ T8912]  new_sync_write+0x303/0x400
[  107.992707][ T8912]  __vfs_write+0x9e/0xb0
[  107.996928][ T8912]  vfs_write+0x189/0x380
[  108.001156][ T8912]  ksys_write+0x16a/0x1a0
[  108.005463][ T8912]  __x64_sys_write+0x49/0x60
[  108.010030][ T8912]  do_syscall_64+0xc7/0x3b0
[  108.014513][ T8912]  entry_SYSCALL_64_after_hwframe+0x44/0xa9
[  108.020373][ T8912] 
[  108.022676][ T8912] Reported by Kernel Concurrency Sanitizer on:
[  108.028845][ T8912] CPU: 1 PID: 8912 Comm: syz-fuzzer Not tainted 5.7.0-rc1-syzkaller #0
[  108.037053][ T8912] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[  108.047084][ T8912] ==================================================================
[  108.055151][ T8912] Kernel panic - not syncing: panic_on_warn set ...
[  108.061804][ T8912] CPU: 1 PID: 8912 Comm: syz-fuzzer Not tainted 5.7.0-rc1-syzkaller #0
[  108.070621][ T8912] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[  108.080650][ T8912] Call Trace:
[  108.083923][ T8912]  dump_stack+0x11d/0x187
[  108.088232][ T8912]  panic+0x210/0x640
[  108.092108][ T8912]  ? vprintk_func+0x89/0x13a
[  108.096682][ T8912]  kcsan_report.cold+0xc/0x1a
[  108.101357][ T8912]  kcsan_setup_watchpoint+0x3fb/0x440
[  108.106712][ T8912]  mod_timer+0x631/0x830
[  108.110952][ T8912]  sk_reset_timer+0x29/0xc0
[  108.115524][ T8912]  tcp_rearm_rto+0x1ce/0x280
[  108.120110][ T8912]  tcp_event_new_data_sent+0x23f/0x260
[  108.125561][ T8912]  tcp_write_xmit+0x5c6/0x31e0
[  108.130313][ T8912]  ? iov_iter_advance+0x21c/0x900
[  108.135318][ T8912]  __tcp_push_pending_frames+0x72/0x1b0
[  108.140842][ T8912]  tcp_push+0x1ec/0x3e0
[  108.144980][ T8912]  tcp_sendmsg_locked+0x1de3/0x20f0
[  108.150167][ T8912]  ? aa_label_sk_perm.part.0+0x220/0x290
[  108.155781][ T8912]  tcp_sendmsg+0x35/0x50
[  108.160006][ T8912]  inet_sendmsg+0x69/0x90
[  108.164317][ T8912]  ? inet_send_prepare+0x1f0/0x1f0
[  108.169407][ T8912]  sock_sendmsg+0x98/0xc0
[  108.173718][ T8912]  sock_write_iter+0x186/0x240
[  108.178482][ T8912]  new_sync_write+0x303/0x400
[  108.183154][ T8912]  __vfs_write+0x9e/0xb0
[  108.187389][ T8912]  vfs_write+0x189/0x380
[  108.191625][ T8912]  ksys_write+0x16a/0x1a0
[  108.196280][ T8912]  __x64_sys_write+0x49/0x60
[  108.200863][ T8912]  do_syscall_64+0xc7/0x3b0
[  108.205360][ T8912]  entry_SYSCALL_64_after_hwframe+0x44/0xa9
[  108.211347][ T8912] RIP: 0033:0x47c530
[  108.215230][ T8912] Code: 8b 7c 24 10 48 8b 74 24 18 48 8b 54 24 20 49 c7 c2 00 00 00 00 49 c7 c0 00 00 00 00 49 c7 c1 00 00 00 00 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
[  108.235063][ T8912] RSP: 002b:000000c4258f34a0 EFLAGS: 00000202 ORIG_RAX: 0000000000000001
[  108.243469][ T8912] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000047c530
[  108.251533][ T8912] RDX: 0000000000000007 RSI: 000000c420366200 RDI: 0000000000000003
[  108.259493][ T8912] RBP: 000000c4258f34f8 R08: 0000000000000000 R09: 0000000000000000
[  108.267449][ T8912] R10: 0000000000000000 R11: 0000000000000202 R12: 000000c4200b5b00
[  108.275409][ T8912] R13: 0000000000000007 R14: 0000000000c79d40 R15: 0000000000003aba
[  109.359228][ T8912] Shutting down cpus with NMI
[  109.365321][ T8912] Kernel Offset: disabled
[  109.369660][ T8912] Rebooting in 86400 seconds..