[ OK ] Started Getty on tty2. [ OK ] Started Getty on tty1. [ OK ] Started Serial Getty on ttyS0. [ 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 '10.128.10.39' (ECDSA) to the list of known hosts. 2020/05/30 02:41:45 fuzzer started 2020/05/30 02:41:45 dialing manager at 10.128.0.105:42021 2020/05/30 02:41:46 syscalls: 3055 2020/05/30 02:41:46 code coverage: enabled 2020/05/30 02:41:46 comparison tracing: enabled 2020/05/30 02:41:46 extra coverage: enabled 2020/05/30 02:41:46 setuid sandbox: enabled 2020/05/30 02:41:46 namespace sandbox: enabled 2020/05/30 02:41:46 Android sandbox: /sys/fs/selinux/policy does not exist 2020/05/30 02:41:46 fault injection: enabled 2020/05/30 02:41:46 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2020/05/30 02:41:46 net packet injection: enabled 2020/05/30 02:41:46 net device setup: enabled 2020/05/30 02:41:46 concurrency sanitizer: enabled 2020/05/30 02:41:46 devlink PCI setup: PCI device 0000:00:10.0 is not available 2020/05/30 02:41:46 USB emulation: enabled syzkaller login: [ 52.981079][ T8925] KCSAN: could not find function: '_find_next_bit' 2020/05/30 02:41:48 adding functions to KCSAN blacklist: 'tick_sched_do_timer' 'generic_write_end' 'ext4_free_inodes_count' 'find_get_pages_range_tag' '_find_next_bit' 'ep_poll' 'generic_fillattr' 'run_timer_softirq' 'do_nanosleep' [ 67.674205][ T8911] ================================================================== [ 67.682306][ T8911] BUG: KCSAN: data-race in mod_timer / timer_clear_idle [ 67.689205][ T8911] [ 67.691508][ T8911] write to 0xffff88812c11dca4 of 1 bytes by task 0 on cpu 1: [ 67.698898][ T8911] timer_clear_idle+0x3d/0x50 [ 67.703552][ T8911] __tick_nohz_idle_restart_tick+0x32/0x1a0 [ 67.709418][ T8911] tick_nohz_idle_exit+0x19c/0x1d0 [ 67.714537][ T8911] do_idle+0xac/0x290 [ 67.718493][ T8911] cpu_startup_entry+0x14/0x20 [ 67.723228][ T8911] start_secondary+0x169/0x1b0 [ 67.727963][ T8911] secondary_startup_64+0xa4/0xb0 [ 67.732950][ T8911] [ 67.735292][ T8911] read to 0xffff88812c11dca4 of 1 bytes by task 8911 on cpu 0: [ 67.742848][ T8911] mod_timer+0x631/0x830 [ 67.747062][ T8911] sk_reset_timer+0x29/0xc0 [ 67.751538][ T8911] tcp_rearm_rto+0x1ce/0x280 [ 67.756101][ T8911] tcp_event_new_data_sent+0x23f/0x260 [ 67.761572][ T8911] tcp_write_xmit+0x5c6/0x31e0 [ 67.766310][ T8911] __tcp_push_pending_frames+0x72/0x1b0 [ 67.771865][ T8911] tcp_push+0x1ec/0x3e0 [ 67.776007][ T8911] tcp_sendmsg_locked+0x1de3/0x20f0 [ 67.781193][ T8911] tcp_sendmsg+0x35/0x50 [ 67.785420][ T8911] inet_sendmsg+0x69/0x90 [ 67.789722][ T8911] sock_sendmsg+0x98/0xc0 [ 67.794036][ T8911] sock_write_iter+0x186/0x240 [ 67.798783][ T8911] new_sync_write+0x303/0x400 [ 67.803433][ T8911] __vfs_write+0x9e/0xb0 [ 67.807659][ T8911] vfs_write+0x189/0x380 [ 67.811870][ T8911] ksys_write+0x16a/0x1a0 [ 67.816181][ T8911] __x64_sys_write+0x49/0x60 [ 67.820745][ T8911] do_syscall_64+0xc7/0x3b0 [ 67.825222][ T8911] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 67.831076][ T8911] [ 67.833373][ T8911] Reported by Kernel Concurrency Sanitizer on: [ 67.839607][ T8911] CPU: 0 PID: 8911 Comm: syz-fuzzer Not tainted 5.7.0-rc1-syzkaller #0 [ 67.847911][ T8911] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 67.857935][ T8911] ================================================================== [ 67.865965][ T8911] Kernel panic - not syncing: panic_on_warn set ... [ 67.872526][ T8911] CPU: 0 PID: 8911 Comm: syz-fuzzer Not tainted 5.7.0-rc1-syzkaller #0 [ 67.880729][ T8911] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 67.890769][ T8911] Call Trace: [ 67.894057][ T8911] dump_stack+0x11d/0x187 [ 67.898369][ T8911] panic+0x210/0x640 [ 67.902243][ T8911] ? vprintk_func+0x89/0x13a [ 67.906808][ T8911] kcsan_report.cold+0xc/0x1a [ 67.911463][ T8911] kcsan_setup_watchpoint+0x3fb/0x440 [ 67.916815][ T8911] mod_timer+0x631/0x830 [ 67.921088][ T8911] sk_reset_timer+0x29/0xc0 [ 67.925569][ T8911] tcp_rearm_rto+0x1ce/0x280 [ 67.930140][ T8911] tcp_event_new_data_sent+0x23f/0x260 [ 67.935577][ T8911] tcp_write_xmit+0x5c6/0x31e0 [ 67.940322][ T8911] ? iov_iter_advance+0x21c/0x900 [ 67.945365][ T8911] __tcp_push_pending_frames+0x72/0x1b0 [ 67.950911][ T8911] tcp_push+0x1ec/0x3e0 [ 67.955057][ T8911] tcp_sendmsg_locked+0x1de3/0x20f0 [ 67.960236][ T8911] ? aa_label_sk_perm.part.0+0x220/0x290 [ 67.965848][ T8911] tcp_sendmsg+0x35/0x50 [ 67.970065][ T8911] inet_sendmsg+0x69/0x90 [ 67.974370][ T8911] ? inet_send_prepare+0x1f0/0x1f0 [ 67.979473][ T8911] sock_sendmsg+0x98/0xc0 [ 67.983778][ T8911] sock_write_iter+0x186/0x240 [ 67.988527][ T8911] new_sync_write+0x303/0x400 [ 67.993195][ T8911] __vfs_write+0x9e/0xb0 [ 67.997411][ T8911] vfs_write+0x189/0x380 [ 68.001666][ T8911] ksys_write+0x16a/0x1a0 [ 68.005999][ T8911] __x64_sys_write+0x49/0x60 [ 68.010566][ T8911] do_syscall_64+0xc7/0x3b0 [ 68.015046][ T8911] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 68.020913][ T8911] RIP: 0033:0x4b3cdb [ 68.024790][ T8911] 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 [ 68.044367][ T8911] RSP: 002b:000000c0006a7540 EFLAGS: 00000202 ORIG_RAX: 0000000000000001 [ 68.052750][ T8911] RAX: ffffffffffffffda RBX: 000000c00002c000 RCX: 00000000004b3cdb [ 68.060723][ T8911] RDX: 0000000000000007 RSI: 000000c00000a3e0 RDI: 0000000000000006 [ 68.068688][ T8911] RBP: 000000c0006a7590 R08: 000000c00000a301 R09: 0000000000000007 [ 68.076636][ T8911] R10: 000000c000112000 R11: 0000000000000202 R12: 000000000000011e [ 68.084585][ T8911] R13: 000000c00037e000 R14: 0000000000000007 R15: 000000000000303c [ 69.168997][ T8911] Shutting down cpus with NMI [ 69.174905][ T8911] Kernel Offset: disabled [ 69.179216][ T8911] Rebooting in 86400 seconds..