[  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.
[   39.476846][ T8628] bash (8628) used greatest stack depth: 10440 bytes left


Debian GNU/Linux 9 syzkaller ttyS0

Warning: Permanently added '10.128.1.34' (ECDSA) to the list of known hosts.
2020/06/18 00:46:02 fuzzer started
2020/06/18 00:46:02 dialing manager at 10.128.0.105:41225
2020/06/18 00:46:08 syscalls: 3089
2020/06/18 00:46:08 code coverage: enabled
2020/06/18 00:46:08 comparison tracing: enabled
2020/06/18 00:46:08 extra coverage: enabled
2020/06/18 00:46:08 setuid sandbox: enabled
2020/06/18 00:46:08 namespace sandbox: enabled
2020/06/18 00:46:08 Android sandbox: /sys/fs/selinux/policy does not exist
2020/06/18 00:46:08 fault injection: enabled
2020/06/18 00:46:08 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled
2020/06/18 00:46:08 net packet injection: enabled
2020/06/18 00:46:08 net device setup: enabled
2020/06/18 00:46:08 concurrency sanitizer: enabled
2020/06/18 00:46:08 devlink PCI setup: PCI device 0000:00:10.0 is not available
2020/06/18 00:46:08 USB emulation: enabled
syzkaller login: [   56.491931][ T8912] KCSAN: could not find function: '_find_next_bit'
2020/06/18 00:46:11 suppressing KCSAN reports in functions: 'pcpu_alloc' 'tick_nohz_next_event' 'futex_wait_queue_me' 'page_counter_charge' 'pipe_double_lock' 'alloc_pid' 'do_nanosleep' 'generic_file_read_iter' '__delete_from_page_cache' 'ext4_mark_iloc_dirty' 'io_sq_thread' 'ext4_free_inodes_count' 'find_get_pages_range_tag' '_find_next_bit' 'blk_mq_get_request' 'fat12_ent_put' 'generic_fillattr' 'ep_poll' '__ext4_new_inode' 'run_timer_softirq' 'tick_nohz_idle_stop_tick' 'blk_mq_sched_dispatch_requests' 'copy_process' 'n_tty_receive_buf_common' 'generic_write_end' 
[  118.158835][ T8903] ==================================================================
[  118.166949][ T8903] BUG: KCSAN: data-race in mod_timer / timer_clear_idle
[  118.173860][ T8903] 
[  118.176164][ T8903] write to 0xffff88812c11dca4 of 1 bytes by task 0 on cpu 1:
[  118.183506][ T8903]  timer_clear_idle+0x3d/0x50
[  118.188196][ T8903]  __tick_nohz_idle_restart_tick+0x32/0x1a0
[  118.194062][ T8903]  tick_nohz_idle_exit+0x19c/0x1d0
[  118.199146][ T8903]  do_idle+0xac/0x290
[  118.203125][ T8903]  cpu_startup_entry+0x14/0x20
[  118.207883][ T8903]  start_secondary+0x169/0x1b0
[  118.212621][ T8903]  secondary_startup_64+0xa4/0xb0
[  118.217609][ T8903] 
[  118.219913][ T8903] read to 0xffff88812c11dca4 of 1 bytes by task 8903 on cpu 0:
[  118.227451][ T8903]  mod_timer+0x631/0x830
[  118.231666][ T8903]  sk_reset_timer+0x29/0xc0
[  118.236141][ T8903]  tcp_rearm_rto+0x1ce/0x280
[  118.240709][ T8903]  tcp_event_new_data_sent+0x23f/0x260
[  118.246154][ T8903]  tcp_write_xmit+0x5c6/0x31e0
[  118.250937][ T8903]  __tcp_push_pending_frames+0x72/0x1b0
[  118.256455][ T8903]  tcp_push+0x1ec/0x3e0
[  118.260583][ T8903]  tcp_sendmsg_locked+0x1de3/0x20f0
[  118.265751][ T8903]  tcp_sendmsg+0x35/0x50
[  118.269966][ T8903]  inet_sendmsg+0x69/0x90
[  118.274305][ T8903]  sock_sendmsg+0x98/0xc0
[  118.278605][ T8903]  sock_write_iter+0x186/0x240
[  118.283343][ T8903]  new_sync_write+0x303/0x400
[  118.288002][ T8903]  __vfs_write+0x9e/0xb0
[  118.292222][ T8903]  vfs_write+0x189/0x380
[  118.296435][ T8903]  ksys_write+0x16a/0x1a0
[  118.300734][ T8903]  __x64_sys_write+0x49/0x60
[  118.305299][ T8903]  do_syscall_64+0xc7/0x3b0
[  118.309785][ T8903]  entry_SYSCALL_64_after_hwframe+0x44/0xa9
[  118.315689][ T8903] 
[  118.317989][ T8903] Reported by Kernel Concurrency Sanitizer on:
[  118.324117][ T8903] CPU: 0 PID: 8903 Comm: syz-fuzzer Not tainted 5.7.0-rc1-syzkaller #0
[  118.332363][ T8903] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[  118.342391][ T8903] ==================================================================
[  118.350423][ T8903] Kernel panic - not syncing: panic_on_warn set ...
[  118.357014][ T8903] CPU: 0 PID: 8903 Comm: syz-fuzzer Not tainted 5.7.0-rc1-syzkaller #0
[  118.365216][ T8903] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[  118.375241][ T8903] Call Trace:
[  118.378543][ T8903]  dump_stack+0x11d/0x187
[  118.382881][ T8903]  panic+0x210/0x640
[  118.386751][ T8903]  ? vprintk_func+0x89/0x13a
[  118.391328][ T8903]  kcsan_report.cold+0xc/0x1a
[  118.395994][ T8903]  kcsan_setup_watchpoint+0x3fb/0x440
[  118.401355][ T8903]  mod_timer+0x631/0x830
[  118.405574][ T8903]  sk_reset_timer+0x29/0xc0
[  118.410060][ T8903]  tcp_rearm_rto+0x1ce/0x280
[  118.414633][ T8903]  tcp_event_new_data_sent+0x23f/0x260
[  118.420081][ T8903]  tcp_write_xmit+0x5c6/0x31e0
[  118.424839][ T8903]  ? iov_iter_advance+0x21c/0x900
[  118.429847][ T8903]  __tcp_push_pending_frames+0x72/0x1b0
[  118.435410][ T8903]  tcp_push+0x1ec/0x3e0
[  118.439580][ T8903]  tcp_sendmsg_locked+0x1de3/0x20f0
[  118.444760][ T8903]  ? aa_label_sk_perm.part.0+0x220/0x290
[  118.450383][ T8903]  tcp_sendmsg+0x35/0x50
[  118.454607][ T8903]  inet_sendmsg+0x69/0x90
[  118.458917][ T8903]  ? inet_send_prepare+0x1f0/0x1f0
[  118.464010][ T8903]  sock_sendmsg+0x98/0xc0
[  118.468317][ T8903]  sock_write_iter+0x186/0x240
[  118.473065][ T8903]  new_sync_write+0x303/0x400
[  118.477723][ T8903]  __vfs_write+0x9e/0xb0
[  118.481941][ T8903]  vfs_write+0x189/0x380
[  118.486161][ T8903]  ksys_write+0x16a/0x1a0
[  118.490479][ T8903]  __x64_sys_write+0x49/0x60
[  118.495051][ T8903]  do_syscall_64+0xc7/0x3b0
[  118.499540][ T8903]  entry_SYSCALL_64_after_hwframe+0x44/0xa9
[  118.505405][ T8903] RIP: 0033:0x4b3cdb
[  118.509278][ T8903] 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
[  118.528853][ T8903] RSP: 002b:000000c0067e5540 EFLAGS: 00000202 ORIG_RAX: 0000000000000001
[  118.537236][ T8903] RAX: ffffffffffffffda RBX: 000000c00002e800 RCX: 00000000004b3cdb
[  118.545191][ T8903] RDX: 0000000000000007 RSI: 000000c00000a200 RDI: 0000000000000006
[  118.553150][ T8903] RBP: 000000c0067e5590 R08: 000000c00000a201 R09: 0000000000000007
[  118.561096][ T8903] R10: 000000c0000c4000 R11: 0000000000000202 R12: 000000000000011e
[  118.569040][ T8903] R13: 000000c000380000 R14: 0000000000000007 R15: 0000000000005924
[  119.657371][ T8903] Shutting down cpus with NMI
[  119.663154][ T8903] Kernel Offset: disabled
[  119.667495][ T8903] Rebooting in 86400 seconds..