[ OK ] Started Serial Getty on ttyS0. [ OK ] Started Getty on tty3. [ OK ] Started Getty on tty2. [ 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. Starting Load/Save RF Kill Switch Status... [ OK ] Started Load/Save RF Kill Switch Status. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.174' (ECDSA) to the list of known hosts. 2020/05/25 12:59:28 fuzzer started 2020/05/25 12:59:28 dialing manager at 10.128.0.105:40969 2020/05/25 12:59:30 syscalls: 3055 2020/05/25 12:59:30 code coverage: enabled 2020/05/25 12:59:30 comparison tracing: enabled 2020/05/25 12:59:30 extra coverage: enabled 2020/05/25 12:59:30 setuid sandbox: enabled 2020/05/25 12:59:30 namespace sandbox: enabled 2020/05/25 12:59:30 Android sandbox: /sys/fs/selinux/policy does not exist 2020/05/25 12:59:30 fault injection: enabled 2020/05/25 12:59:30 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2020/05/25 12:59:30 net packet injection: enabled 2020/05/25 12:59:30 net device setup: enabled 2020/05/25 12:59:30 concurrency sanitizer: enabled 2020/05/25 12:59:30 devlink PCI setup: PCI device 0000:00:10.0 is not available 2020/05/25 12:59:30 USB emulation: enabled 2020/05/25 12:59:31 adding functions to KCSAN blacklist: 'ep_poll' 'copy_process' 'find_get_pages_range_tag' 'run_timer_softirq' 'xas_find_marked' 'generic_write_end' 'dd_has_work' 'xas_clear_mark' 'blk_mq_dispatch_rq_list' '__ext4_new_inode' syzkaller login: [ 72.651898][ T8913] ================================================================== [ 72.660019][ T8913] BUG: KCSAN: data-race in mod_timer / timer_clear_idle [ 72.666922][ T8913] [ 72.669241][ T8913] write to 0xffff88812c11dca4 of 1 bytes by task 0 on cpu 1: [ 72.676599][ T8913] timer_clear_idle+0x3d/0x50 [ 72.681261][ T8913] __tick_nohz_idle_restart_tick+0x32/0x1a0 [ 72.687149][ T8913] tick_nohz_idle_exit+0x19c/0x1d0 [ 72.692245][ T8913] do_idle+0xac/0x290 [ 72.696214][ T8913] cpu_startup_entry+0x14/0x20 [ 72.700965][ T8913] start_secondary+0x169/0x1b0 [ 72.705803][ T8913] secondary_startup_64+0xa4/0xb0 [ 72.710809][ T8913] [ 72.713131][ T8913] read to 0xffff88812c11dca4 of 1 bytes by task 8913 on cpu 0: [ 72.720672][ T8913] mod_timer+0x631/0x830 [ 72.724903][ T8913] sk_reset_timer+0x29/0xc0 [ 72.729387][ T8913] tcp_rearm_rto+0x1ce/0x280 [ 72.733959][ T8913] tcp_event_new_data_sent+0x23f/0x260 [ 72.739397][ T8913] tcp_write_xmit+0x5c6/0x31e0 [ 72.744139][ T8913] __tcp_push_pending_frames+0x72/0x1b0 [ 72.749744][ T8913] tcp_push+0x1ec/0x3e0 [ 72.754486][ T8913] tcp_sendmsg_locked+0x1de3/0x20f0 [ 72.759659][ T8913] tcp_sendmsg+0x35/0x50 [ 72.763888][ T8913] inet_sendmsg+0x69/0x90 [ 72.768193][ T8913] sock_sendmsg+0x98/0xc0 [ 72.772496][ T8913] sock_write_iter+0x186/0x240 [ 72.777247][ T8913] new_sync_write+0x303/0x400 [ 72.781912][ T8913] __vfs_write+0x9e/0xb0 [ 72.786913][ T8913] vfs_write+0x189/0x380 [ 72.791134][ T8913] ksys_write+0x16a/0x1a0 [ 72.795468][ T8913] __x64_sys_write+0x49/0x60 [ 72.800036][ T8913] do_syscall_64+0xc7/0x3b0 [ 72.804543][ T8913] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 72.810400][ T8913] [ 72.812717][ T8913] Reported by Kernel Concurrency Sanitizer on: [ 72.818853][ T8913] CPU: 0 PID: 8913 Comm: syz-fuzzer Not tainted 5.7.0-rc1-syzkaller #0 [ 72.827093][ T8913] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 72.837128][ T8913] ================================================================== [ 72.845162][ T8913] Kernel panic - not syncing: panic_on_warn set ... [ 72.851744][ T8913] CPU: 0 PID: 8913 Comm: syz-fuzzer Not tainted 5.7.0-rc1-syzkaller #0 [ 72.859950][ T8913] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 72.869988][ T8913] Call Trace: [ 72.873259][ T8913] dump_stack+0x11d/0x187 [ 72.877763][ T8913] panic+0x210/0x640 [ 72.881638][ T8913] ? vprintk_func+0x89/0x13a [ 72.886205][ T8913] kcsan_report.cold+0xc/0x1a [ 72.890865][ T8913] kcsan_setup_watchpoint+0x3fb/0x440 [ 72.896373][ T8913] mod_timer+0x631/0x830 [ 72.900620][ T8913] sk_reset_timer+0x29/0xc0 [ 72.905124][ T8913] tcp_rearm_rto+0x1ce/0x280 [ 72.909699][ T8913] tcp_event_new_data_sent+0x23f/0x260 [ 72.915153][ T8913] tcp_write_xmit+0x5c6/0x31e0 [ 72.919921][ T8913] ? iov_iter_advance+0x21c/0x900 [ 72.925124][ T8913] __tcp_push_pending_frames+0x72/0x1b0 [ 72.930667][ T8913] tcp_push+0x1ec/0x3e0 [ 72.934803][ T8913] tcp_sendmsg_locked+0x1de3/0x20f0 [ 72.940003][ T8913] ? aa_label_sk_perm.part.0+0x220/0x290 [ 72.945798][ T8913] tcp_sendmsg+0x35/0x50 [ 72.950018][ T8913] inet_sendmsg+0x69/0x90 [ 72.954360][ T8913] ? inet_send_prepare+0x1f0/0x1f0 [ 72.959457][ T8913] sock_sendmsg+0x98/0xc0 [ 72.963784][ T8913] sock_write_iter+0x186/0x240 [ 72.969061][ T8913] new_sync_write+0x303/0x400 [ 72.973778][ T8913] __vfs_write+0x9e/0xb0 [ 72.978001][ T8913] vfs_write+0x189/0x380 [ 72.982251][ T8913] ksys_write+0x16a/0x1a0 [ 72.986563][ T8913] __x64_sys_write+0x49/0x60 [ 72.991153][ T8913] do_syscall_64+0xc7/0x3b0 [ 72.995650][ T8913] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 73.001551][ T8913] RIP: 0033:0x47c530 [ 73.005441][ T8913] 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 [ 73.025134][ T8913] RSP: 002b:000000c42226d4a0 EFLAGS: 00000202 ORIG_RAX: 0000000000000001 [ 73.033551][ T8913] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000047c530 [ 73.041887][ T8913] RDX: 0000000000000008 RSI: 000000c42036c200 RDI: 0000000000000003 [ 73.049838][ T8913] RBP: 000000c42226d4f8 R08: 0000000000000000 R09: 0000000000000000 [ 73.057803][ T8913] R10: 0000000000000000 R11: 0000000000000202 R12: 000000c4200c3b00 [ 73.065803][ T8913] R13: 0000000000000007 R14: 0000000000c78780 R15: 0000000000001bd4 [ 74.150541][ T8913] Shutting down cpus with NMI [ 74.156834][ T8913] Kernel Offset: disabled [ 74.161261][ T8913] Rebooting in 86400 seconds..