[ 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 '10.128.0.51' (ECDSA) to the list of known hosts. 2020/06/13 23:44:19 fuzzer started 2020/06/13 23:44:19 dialing manager at 10.128.0.105:38693 2020/06/13 23:44:22 syscalls: 3085 2020/06/13 23:44:22 code coverage: enabled 2020/06/13 23:44:22 comparison tracing: enabled 2020/06/13 23:44:22 extra coverage: enabled 2020/06/13 23:44:22 setuid sandbox: enabled 2020/06/13 23:44:22 namespace sandbox: enabled 2020/06/13 23:44:22 Android sandbox: /sys/fs/selinux/policy does not exist 2020/06/13 23:44:22 fault injection: enabled 2020/06/13 23:44:22 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2020/06/13 23:44:22 net packet injection: enabled 2020/06/13 23:44:22 net device setup: enabled 2020/06/13 23:44:22 concurrency sanitizer: enabled 2020/06/13 23:44:22 devlink PCI setup: PCI device 0000:00:10.0 is not available 2020/06/13 23:44:22 USB emulation: enabled 2020/06/13 23:44:24 adding functions to KCSAN blacklist: 'copy_process' '__send_signal' 'futex_wait_queue_me' 'xas_clear_mark' '__ext4_new_inode' 'ext4_free_inodes_count' 'blk_mq_dispatch_rq_list' 'do_nanosleep' 'alloc_pid' 'find_get_pages_range_tag' 'generic_fillattr' 'filemap_map_pages' 'ep_poll' '__perf_event_overflow' 'generic_write_end' 'add_timer' '_find_next_bit' syzkaller login: [ 54.919199][ T8942] KCSAN: could not find function: '_find_next_bit' [ 81.300040][ T8943] ================================================================== [ 81.308164][ T8943] BUG: KCSAN: data-race in mod_timer / timer_clear_idle [ 81.315316][ T8943] [ 81.317848][ T8943] write to 0xffff88812c11dca4 of 1 bytes by task 0 on cpu 1: [ 81.325487][ T8943] timer_clear_idle+0x3d/0x50 [ 81.330196][ T8943] __tick_nohz_idle_restart_tick+0x32/0x1a0 [ 81.336090][ T8943] tick_nohz_idle_exit+0x19c/0x1d0 [ 81.341184][ T8943] do_idle+0xac/0x290 [ 81.345140][ T8943] cpu_startup_entry+0x14/0x20 [ 81.349901][ T8943] start_secondary+0x169/0x1b0 [ 81.354813][ T8943] secondary_startup_64+0xa4/0xb0 [ 81.359839][ T8943] [ 81.362188][ T8943] read to 0xffff88812c11dca4 of 1 bytes by task 8943 on cpu 0: [ 81.369906][ T8943] mod_timer+0x631/0x830 [ 81.374213][ T8943] sk_reset_timer+0x29/0xc0 [ 81.378977][ T8943] tcp_rearm_rto+0x1ce/0x280 [ 81.383558][ T8943] tcp_event_new_data_sent+0x23f/0x260 [ 81.389092][ T8943] tcp_write_xmit+0x5c6/0x31e0 [ 81.393855][ T8943] __tcp_push_pending_frames+0x72/0x1b0 [ 81.403137][ T8943] tcp_push+0x1ec/0x3e0 [ 81.407283][ T8943] tcp_sendmsg_locked+0x1de3/0x20f0 [ 81.412453][ T8943] tcp_sendmsg+0x35/0x50 [ 81.416673][ T8943] inet_sendmsg+0x69/0x90 [ 81.420988][ T8943] sock_sendmsg+0x98/0xc0 [ 81.425292][ T8943] sock_write_iter+0x186/0x240 [ 81.430208][ T8943] new_sync_write+0x303/0x400 [ 81.434863][ T8943] __vfs_write+0x9e/0xb0 [ 81.439078][ T8943] vfs_write+0x189/0x380 [ 81.443294][ T8943] ksys_write+0x16a/0x1a0 [ 81.447604][ T8943] __x64_sys_write+0x49/0x60 [ 81.452170][ T8943] do_syscall_64+0xc7/0x3b0 [ 81.456745][ T8943] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 81.462605][ T8943] [ 81.464918][ T8943] Reported by Kernel Concurrency Sanitizer on: [ 81.471200][ T8943] CPU: 0 PID: 8943 Comm: syz-fuzzer Not tainted 5.7.0-rc1-syzkaller #0 [ 81.479421][ T8943] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 81.489463][ T8943] ================================================================== [ 81.497508][ T8943] Kernel panic - not syncing: panic_on_warn set ... [ 81.504070][ T8943] CPU: 0 PID: 8943 Comm: syz-fuzzer Not tainted 5.7.0-rc1-syzkaller #0 [ 81.512276][ T8943] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 81.522599][ T8943] Call Trace: [ 81.525895][ T8943] dump_stack+0x11d/0x187 [ 81.530234][ T8943] panic+0x210/0x640 [ 81.534110][ T8943] ? vprintk_func+0x89/0x13a [ 81.538680][ T8943] kcsan_report.cold+0xc/0x1a [ 81.543336][ T8943] kcsan_setup_watchpoint+0x3fb/0x440 [ 81.548686][ T8943] mod_timer+0x631/0x830 [ 81.552908][ T8943] sk_reset_timer+0x29/0xc0 [ 81.557440][ T8943] tcp_rearm_rto+0x1ce/0x280 [ 81.562023][ T8943] tcp_event_new_data_sent+0x23f/0x260 [ 81.567481][ T8943] tcp_write_xmit+0x5c6/0x31e0 [ 81.572255][ T8943] ? iov_iter_advance+0x21c/0x900 [ 81.577285][ T8943] __tcp_push_pending_frames+0x72/0x1b0 [ 81.582827][ T8943] tcp_push+0x1ec/0x3e0 [ 81.586971][ T8943] tcp_sendmsg_locked+0x1de3/0x20f0 [ 81.592396][ T8943] ? aa_label_sk_perm.part.0+0x220/0x290 [ 81.598018][ T8943] tcp_sendmsg+0x35/0x50 [ 81.603022][ T8943] inet_sendmsg+0x69/0x90 [ 81.607331][ T8943] ? inet_send_prepare+0x1f0/0x1f0 [ 81.612419][ T8943] sock_sendmsg+0x98/0xc0 [ 81.616727][ T8943] sock_write_iter+0x186/0x240 [ 81.621566][ T8943] new_sync_write+0x303/0x400 [ 81.626233][ T8943] __vfs_write+0x9e/0xb0 [ 81.630461][ T8943] vfs_write+0x189/0x380 [ 81.634691][ T8943] ksys_write+0x16a/0x1a0 [ 81.639010][ T8943] __x64_sys_write+0x49/0x60 [ 81.643620][ T8943] do_syscall_64+0xc7/0x3b0 [ 81.648109][ T8943] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 81.653990][ T8943] RIP: 0033:0x4b3cdb [ 81.657962][ T8943] 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 [ 81.677564][ T8943] RSP: 002b:000000c000509540 EFLAGS: 00000202 ORIG_RAX: 0000000000000001 [ 81.685960][ T8943] RAX: ffffffffffffffda RBX: 000000c00002e800 RCX: 00000000004b3cdb [ 81.693927][ T8943] RDX: 0000000000000007 RSI: 000000c00000a200 RDI: 0000000000000006 [ 81.701880][ T8943] RBP: 000000c000509590 R08: 000000c00000a201 R09: 0000000000000007 [ 81.710402][ T8943] R10: 000000c0000c4000 R11: 0000000000000202 R12: 000000000000011e [ 81.718403][ T8943] R13: 000000c000380000 R14: 0000000000000007 R15: 0000000000001c99 [ 82.803733][ T8943] Shutting down cpus with NMI [ 82.809944][ T8943] Kernel Offset: disabled [ 82.814263][ T8943] Rebooting in 86400 seconds..