[  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 '10.128.0.205' (ECDSA) to the list of known hosts.
2020/06/06 15:35:07 fuzzer started
2020/06/06 15:35:07 dialing manager at 10.128.0.105:33593
2020/06/06 15:35:07 syscalls: 3055
2020/06/06 15:35:07 code coverage: enabled
2020/06/06 15:35:07 comparison tracing: enabled
2020/06/06 15:35:07 extra coverage: enabled
2020/06/06 15:35:07 setuid sandbox: enabled
2020/06/06 15:35:07 namespace sandbox: enabled
2020/06/06 15:35:07 Android sandbox: /sys/fs/selinux/policy does not exist
2020/06/06 15:35:07 fault injection: enabled
2020/06/06 15:35:07 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled
2020/06/06 15:35:07 net packet injection: enabled
2020/06/06 15:35:07 net device setup: enabled
2020/06/06 15:35:07 concurrency sanitizer: enabled
2020/06/06 15:35:07 devlink PCI setup: PCI device 0000:00:10.0 is not available
2020/06/06 15:35:07 USB emulation: enabled
syzkaller login: [   49.375437][ T8919] KCSAN: could not find function: '_find_next_bit'
2020/06/06 15:35:11 adding functions to KCSAN blacklist: 'run_timer_softirq' 'blk_mq_sched_dispatch_requests' '__send_signal' 'xas_clear_mark' 'do_syslog' '_find_next_bit' 'blk_mq_get_request' 'dd_has_work' 'do_nanosleep' 'futex_wait_queue_me' 'pcpu_alloc' 'generic_fillattr' 'af_alg_sendpage' 'ep_poll' 'blk_mq_dispatch_rq_list' 'tick_nohz_idle_stop_tick' 'generic_write_end' 'find_get_pages_range_tag' 'alloc_pid' 'page_counter_charge' 'ext4_free_inodes_count' '__snd_rawmidi_transmit_ack' '__mark_inode_dirty' 'ext4_mark_iloc_dirty' '__ext4_new_inode' 'tick_sched_do_timer' 'copy_process' 
[  179.369771][ T8905] ==================================================================
[  179.377923][ T8905] BUG: KCSAN: data-race in mod_timer / timer_clear_idle
[  179.385052][ T8905] 
[  179.387368][ T8905] write to 0xffff88812c01dca4 of 1 bytes by task 0 on cpu 0:
[  179.394725][ T8905]  timer_clear_idle+0x3d/0x50
[  179.399395][ T8905]  __tick_nohz_idle_restart_tick+0x32/0x1a0
[  179.405486][ T8905]  tick_nohz_idle_exit+0x19c/0x1d0
[  179.412318][ T8905]  do_idle+0xac/0x290
[  179.416297][ T8905]  cpu_startup_entry+0x14/0x20
[  179.421056][ T8905]  rest_init+0xe4/0xeb
[  179.425101][ T8905]  arch_call_rest_init+0x13/0x2b
[  179.430025][ T8905]  start_kernel+0x7fe/0x823
[  179.434526][ T8905]  secondary_startup_64+0xa4/0xb0
[  179.439528][ T8905] 
[  179.441833][ T8905] read to 0xffff88812c01dca4 of 1 bytes by task 8905 on cpu 1:
[  179.449354][ T8905]  mod_timer+0x631/0x830
[  179.453573][ T8905]  sk_reset_timer+0x29/0xc0
[  179.458069][ T8905]  tcp_rearm_rto+0x1ce/0x280
[  179.462634][ T8905]  tcp_event_new_data_sent+0x23f/0x260
[  179.468066][ T8905]  tcp_write_xmit+0x5c6/0x31e0
[  179.472825][ T8905]  __tcp_push_pending_frames+0x72/0x1b0
[  179.478490][ T8905]  tcp_push+0x1ec/0x3e0
[  179.482639][ T8905]  tcp_sendmsg_locked+0x1de3/0x20f0
[  179.487825][ T8905]  tcp_sendmsg+0x35/0x50
[  179.492044][ T8905]  inet_sendmsg+0x69/0x90
[  179.496359][ T8905]  sock_sendmsg+0x98/0xc0
[  179.500662][ T8905]  sock_write_iter+0x186/0x240
[  179.505423][ T8905]  new_sync_write+0x303/0x400
[  179.510253][ T8905]  __vfs_write+0x9e/0xb0
[  179.514473][ T8905]  vfs_write+0x189/0x380
[  179.518711][ T8905]  ksys_write+0x16a/0x1a0
[  179.523031][ T8905]  __x64_sys_write+0x49/0x60
[  179.527599][ T8905]  do_syscall_64+0xc7/0x3b0
[  179.532081][ T8905]  entry_SYSCALL_64_after_hwframe+0x44/0xa9
[  179.537939][ T8905] 
[  179.540238][ T8905] Reported by Kernel Concurrency Sanitizer on:
[  179.546374][ T8905] CPU: 1 PID: 8905 Comm: syz-fuzzer Not tainted 5.7.0-rc1-syzkaller #0
[  179.554590][ T8905] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[  179.564637][ T8905] ==================================================================
[  179.572691][ T8905] Kernel panic - not syncing: panic_on_warn set ...
[  179.579288][ T8905] CPU: 1 PID: 8905 Comm: syz-fuzzer Not tainted 5.7.0-rc1-syzkaller #0
[  179.587558][ T8905] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[  179.597606][ T8905] Call Trace:
[  179.600900][ T8905]  dump_stack+0x11d/0x187
[  179.605271][ T8905]  panic+0x210/0x640
[  179.609153][ T8905]  ? vprintk_func+0x89/0x13a
[  179.613723][ T8905]  kcsan_report.cold+0xc/0x1a
[  179.618388][ T8905]  kcsan_setup_watchpoint+0x3fb/0x440
[  179.623916][ T8905]  mod_timer+0x631/0x830
[  179.628318][ T8905]  sk_reset_timer+0x29/0xc0
[  179.632799][ T8905]  tcp_rearm_rto+0x1ce/0x280
[  179.637368][ T8905]  tcp_event_new_data_sent+0x23f/0x260
[  179.643856][ T8905]  tcp_write_xmit+0x5c6/0x31e0
[  179.648609][ T8905]  ? iov_iter_advance+0x21c/0x900
[  179.653656][ T8905]  __tcp_push_pending_frames+0x72/0x1b0
[  179.659194][ T8905]  tcp_push+0x1ec/0x3e0
[  179.663346][ T8905]  tcp_sendmsg_locked+0x1de3/0x20f0
[  179.668631][ T8905]  ? aa_label_sk_perm.part.0+0x220/0x290
[  179.674861][ T8905]  tcp_sendmsg+0x35/0x50
[  179.679082][ T8905]  inet_sendmsg+0x69/0x90
[  179.683398][ T8905]  ? inet_send_prepare+0x1f0/0x1f0
[  179.689095][ T8905]  sock_sendmsg+0x98/0xc0
[  179.693412][ T8905]  sock_write_iter+0x186/0x240
[  179.698178][ T8905]  new_sync_write+0x303/0x400
[  179.702843][ T8905]  __vfs_write+0x9e/0xb0
[  179.707073][ T8905]  vfs_write+0x189/0x380
[  179.711928][ T8905]  ksys_write+0x16a/0x1a0
[  179.716250][ T8905]  __x64_sys_write+0x49/0x60
[  179.720833][ T8905]  do_syscall_64+0xc7/0x3b0
[  179.725326][ T8905]  entry_SYSCALL_64_after_hwframe+0x44/0xa9
[  179.731198][ T8905] RIP: 0033:0x4b3cdb
[  179.735090][ T8905] 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
[  179.754715][ T8905] RSP: 002b:000000c002999540 EFLAGS: 00000202 ORIG_RAX: 0000000000000001
[  179.763101][ T8905] RAX: ffffffffffffffda RBX: 000000c00002e800 RCX: 00000000004b3cdb
[  179.771917][ T8905] RDX: 0000000000000007 RSI: 000000c00000a3e0 RDI: 0000000000000006
[  179.780730][ T8905] RBP: 000000c002999590 R08: 000000c00000a301 R09: 0000000000000007
[  179.788694][ T8905] R10: 000000c000094000 R11: 0000000000000202 R12: 000000000000011e
[  179.796649][ T8905] R13: 000000c000210000 R14: 0000000000000007 R15: 0000000000008eaa
[  180.880938][ T8905] Shutting down cpus with NMI
[  180.887091][ T8905] Kernel Offset: disabled
[  180.891422][ T8905] Rebooting in 86400 seconds..