[ 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 '10.128.0.130' (ECDSA) to the list of known hosts. 2020/06/11 00:40:52 fuzzer started 2020/06/11 00:40:52 dialing manager at 10.128.0.105:37751 2020/06/11 00:40:52 syscalls: 3078 2020/06/11 00:40:52 code coverage: enabled 2020/06/11 00:40:52 comparison tracing: enabled 2020/06/11 00:40:52 extra coverage: enabled 2020/06/11 00:40:52 setuid sandbox: enabled 2020/06/11 00:40:52 namespace sandbox: enabled 2020/06/11 00:40:52 Android sandbox: /sys/fs/selinux/policy does not exist 2020/06/11 00:40:52 fault injection: enabled 2020/06/11 00:40:52 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2020/06/11 00:40:52 net packet injection: enabled 2020/06/11 00:40:52 net device setup: enabled 2020/06/11 00:40:52 concurrency sanitizer: enabled 2020/06/11 00:40:52 devlink PCI setup: PCI device 0000:00:10.0 is not available 2020/06/11 00:40:52 USB emulation: enabled 2020/06/11 00:40:52 adding functions to KCSAN blacklist: 'ep_poll' '__ext4_new_inode' 'dd_has_work' 'alloc_pid' 'tick_nohz_next_event' 'complete_signal' 'find_get_pages_range_tag' 'generic_write_end' 'run_timer_softirq' syzkaller login: [ 62.762201][ T8892] ================================================================== [ 62.770382][ T8892] BUG: KCSAN: data-race in mod_timer / timer_clear_idle [ 62.777292][ T8892] [ 62.779602][ T8892] write to 0xffff88812c01dca4 of 1 bytes by task 0 on cpu 0: [ 62.787051][ T8892] timer_clear_idle+0x3d/0x50 [ 62.791717][ T8892] __tick_nohz_idle_restart_tick+0x32/0x1a0 [ 62.797609][ T8892] tick_nohz_idle_exit+0x19c/0x1d0 [ 62.802816][ T8892] do_idle+0xac/0x290 [ 62.806785][ T8892] cpu_startup_entry+0x14/0x20 [ 62.811527][ T8892] rest_init+0xe4/0xeb [ 62.815662][ T8892] arch_call_rest_init+0x13/0x2b [ 62.820592][ T8892] start_kernel+0x7fe/0x823 [ 62.825095][ T8892] secondary_startup_64+0xa4/0xb0 [ 62.830113][ T8892] [ 62.832423][ T8892] read to 0xffff88812c01dca4 of 1 bytes by task 8892 on cpu 1: [ 62.839986][ T8892] mod_timer+0x631/0x830 [ 62.844212][ T8892] sk_reset_timer+0x29/0xc0 [ 62.848704][ T8892] tcp_rearm_rto+0x1ce/0x280 [ 62.853286][ T8892] tcp_event_new_data_sent+0x23f/0x260 [ 62.858736][ T8892] tcp_write_xmit+0x5c6/0x31e0 [ 62.863478][ T8892] __tcp_push_pending_frames+0x72/0x1b0 [ 62.869002][ T8892] tcp_push+0x1ec/0x3e0 [ 62.873133][ T8892] tcp_sendmsg_locked+0x1de3/0x20f0 [ 62.878304][ T8892] tcp_sendmsg+0x35/0x50 [ 62.882527][ T8892] inet_sendmsg+0x69/0x90 [ 62.886836][ T8892] sock_sendmsg+0x98/0xc0 [ 62.891142][ T8892] sock_write_iter+0x186/0x240 [ 62.895883][ T8892] new_sync_write+0x303/0x400 [ 62.900547][ T8892] __vfs_write+0x9e/0xb0 [ 62.904777][ T8892] vfs_write+0x189/0x380 [ 62.909004][ T8892] ksys_write+0x16a/0x1a0 [ 62.915305][ T8892] __x64_sys_write+0x49/0x60 [ 62.919888][ T8892] do_syscall_64+0xc7/0x3b0 [ 62.924367][ T8892] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 62.930241][ T8892] [ 62.932559][ T8892] Reported by Kernel Concurrency Sanitizer on: [ 62.938810][ T8892] CPU: 1 PID: 8892 Comm: syz-fuzzer Not tainted 5.7.0-rc1-syzkaller #0 [ 62.947105][ T8892] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 62.957202][ T8892] ================================================================== [ 62.965248][ T8892] Kernel panic - not syncing: panic_on_warn set ... [ 62.971817][ T8892] CPU: 1 PID: 8892 Comm: syz-fuzzer Not tainted 5.7.0-rc1-syzkaller #0 [ 62.980041][ T8892] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 62.990403][ T8892] Call Trace: [ 62.993683][ T8892] dump_stack+0x11d/0x187 [ 62.997997][ T8892] panic+0x210/0x640 [ 63.001873][ T8892] ? vprintk_func+0x89/0x13a [ 63.006472][ T8892] kcsan_report.cold+0xc/0x1a [ 63.011129][ T8892] kcsan_setup_watchpoint+0x3fb/0x440 [ 63.016550][ T8892] mod_timer+0x631/0x830 [ 63.020819][ T8892] sk_reset_timer+0x29/0xc0 [ 63.025580][ T8892] tcp_rearm_rto+0x1ce/0x280 [ 63.030150][ T8892] tcp_event_new_data_sent+0x23f/0x260 [ 63.035591][ T8892] tcp_write_xmit+0x5c6/0x31e0 [ 63.040935][ T8892] ? iov_iter_advance+0x21c/0x900 [ 63.045977][ T8892] __tcp_push_pending_frames+0x72/0x1b0 [ 63.051547][ T8892] tcp_push+0x1ec/0x3e0 [ 63.055692][ T8892] tcp_sendmsg_locked+0x1de3/0x20f0 [ 63.060889][ T8892] ? aa_label_sk_perm.part.0+0x220/0x290 [ 63.066502][ T8892] tcp_sendmsg+0x35/0x50 [ 63.070744][ T8892] inet_sendmsg+0x69/0x90 [ 63.075052][ T8892] ? inet_send_prepare+0x1f0/0x1f0 [ 63.080139][ T8892] sock_sendmsg+0x98/0xc0 [ 63.084461][ T8892] sock_write_iter+0x186/0x240 [ 63.089284][ T8892] new_sync_write+0x303/0x400 [ 63.093962][ T8892] __vfs_write+0x9e/0xb0 [ 63.098194][ T8892] vfs_write+0x189/0x380 [ 63.102615][ T8892] ksys_write+0x16a/0x1a0 [ 63.106930][ T8892] __x64_sys_write+0x49/0x60 [ 63.111521][ T8892] do_syscall_64+0xc7/0x3b0 [ 63.116006][ T8892] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 63.121876][ T8892] RIP: 0033:0x4b3cdb [ 63.125793][ T8892] 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 [ 63.146053][ T8892] RSP: 002b:000000c001b9d540 EFLAGS: 00000202 ORIG_RAX: 0000000000000001 [ 63.154458][ T8892] RAX: ffffffffffffffda RBX: 000000c00002e800 RCX: 00000000004b3cdb [ 63.162433][ T8892] RDX: 0000000000000008 RSI: 000000c00000a200 RDI: 0000000000000006 [ 63.170406][ T8892] RBP: 000000c001b9d590 R08: 000000c00000a201 R09: 0000000000000008 [ 63.178358][ T8892] R10: 000000c0000c4000 R11: 0000000000000202 R12: 000000000000011e [ 63.186320][ T8892] R13: 000000c00038e000 R14: 0000000000000007 R15: 000000000000166a [ 64.273535][ T8892] Shutting down cpus with NMI [ 64.279635][ T8892] Kernel Offset: disabled [ 64.283957][ T8892] Rebooting in 86400 seconds..