[ 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 '10.128.1.13' (ECDSA) to the list of known hosts. 2020/06/05 01:14:20 fuzzer started 2020/06/05 01:14:20 dialing manager at 10.128.0.105:41401 2020/06/05 01:14:21 syscalls: 3055 2020/06/05 01:14:21 code coverage: enabled 2020/06/05 01:14:21 comparison tracing: enabled 2020/06/05 01:14:21 extra coverage: enabled 2020/06/05 01:14:21 setuid sandbox: enabled 2020/06/05 01:14:21 namespace sandbox: enabled 2020/06/05 01:14:21 Android sandbox: /sys/fs/selinux/policy does not exist 2020/06/05 01:14:21 fault injection: enabled 2020/06/05 01:14:21 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2020/06/05 01:14:21 net packet injection: enabled 2020/06/05 01:14:21 net device setup: enabled 2020/06/05 01:14:21 concurrency sanitizer: enabled 2020/06/05 01:14:21 devlink PCI setup: PCI device 0000:00:10.0 is not available 2020/06/05 01:14:21 USB emulation: enabled 2020/06/05 01:14:22 adding functions to KCSAN blacklist: 'run_timer_softirq' '__ext4_new_inode' 'page_counter_charge' 'ep_poll' 'find_get_pages_range_tag' 'xas_clear_mark' 'do_nanosleep' syzkaller login: [ 59.647334][ T8907] ================================================================== [ 59.655453][ T8907] BUG: KCSAN: data-race in mod_timer / timer_clear_idle [ 59.662354][ T8907] [ 59.664715][ T8907] write to 0xffff88812c11dca4 of 1 bytes by task 0 on cpu 1: [ 59.672059][ T8907] timer_clear_idle+0x3d/0x50 [ 59.676713][ T8907] __tick_nohz_idle_restart_tick+0x32/0x1a0 [ 59.682628][ T8907] tick_nohz_idle_exit+0x19c/0x1d0 [ 59.687764][ T8907] do_idle+0xac/0x290 [ 59.691721][ T8907] cpu_startup_entry+0x14/0x20 [ 59.696471][ T8907] start_secondary+0x169/0x1b0 [ 59.701208][ T8907] secondary_startup_64+0xa4/0xb0 [ 59.706197][ T8907] [ 59.708513][ T8907] read to 0xffff88812c11dca4 of 1 bytes by task 8907 on cpu 0: [ 59.716028][ T8907] mod_timer+0x631/0x830 [ 59.720244][ T8907] sk_reset_timer+0x29/0xc0 [ 59.724721][ T8907] tcp_rearm_rto+0x1ce/0x280 [ 59.729286][ T8907] tcp_event_new_data_sent+0x23f/0x260 [ 59.734720][ T8907] tcp_write_xmit+0x5c6/0x31e0 [ 59.739459][ T8907] __tcp_push_pending_frames+0x72/0x1b0 [ 59.744990][ T8907] tcp_push+0x1ec/0x3e0 [ 59.749120][ T8907] tcp_sendmsg_locked+0x1de3/0x20f0 [ 59.754300][ T8907] tcp_sendmsg+0x35/0x50 [ 59.758528][ T8907] inet_sendmsg+0x69/0x90 [ 59.762832][ T8907] sock_sendmsg+0x98/0xc0 [ 59.767134][ T8907] sock_write_iter+0x186/0x240 [ 59.771871][ T8907] new_sync_write+0x303/0x400 [ 59.776521][ T8907] __vfs_write+0x9e/0xb0 [ 59.780745][ T8907] vfs_write+0x189/0x380 [ 59.784959][ T8907] ksys_write+0x16a/0x1a0 [ 59.789260][ T8907] __x64_sys_write+0x49/0x60 [ 59.793828][ T8907] do_syscall_64+0xc7/0x3b0 [ 59.798322][ T8907] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 59.804191][ T8907] [ 59.806507][ T8907] Reported by Kernel Concurrency Sanitizer on: [ 59.812650][ T8907] CPU: 0 PID: 8907 Comm: syz-fuzzer Not tainted 5.7.0-rc1-syzkaller #0 [ 59.821048][ T8907] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 59.831076][ T8907] ================================================================== [ 59.839107][ T8907] Kernel panic - not syncing: panic_on_warn set ... [ 59.845682][ T8907] CPU: 0 PID: 8907 Comm: syz-fuzzer Not tainted 5.7.0-rc1-syzkaller #0 [ 59.853899][ T8907] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 59.863928][ T8907] Call Trace: [ 59.867213][ T8907] dump_stack+0x11d/0x187 [ 59.871530][ T8907] panic+0x210/0x640 [ 59.875402][ T8907] ? vprintk_func+0x89/0x13a [ 59.879968][ T8907] kcsan_report.cold+0xc/0x1a [ 59.884623][ T8907] kcsan_setup_watchpoint+0x3fb/0x440 [ 59.889974][ T8907] mod_timer+0x631/0x830 [ 59.894198][ T8907] sk_reset_timer+0x29/0xc0 [ 59.898678][ T8907] tcp_rearm_rto+0x1ce/0x280 [ 59.903258][ T8907] tcp_event_new_data_sent+0x23f/0x260 [ 59.908692][ T8907] tcp_write_xmit+0x5c6/0x31e0 [ 59.913441][ T8907] ? iov_iter_advance+0x21c/0x900 [ 59.918455][ T8907] __tcp_push_pending_frames+0x72/0x1b0 [ 59.923987][ T8907] tcp_push+0x1ec/0x3e0 [ 59.928140][ T8907] tcp_sendmsg_locked+0x1de3/0x20f0 [ 59.933320][ T8907] ? aa_label_sk_perm.part.0+0x220/0x290 [ 59.938929][ T8907] tcp_sendmsg+0x35/0x50 [ 59.943148][ T8907] inet_sendmsg+0x69/0x90 [ 59.947454][ T8907] ? inet_send_prepare+0x1f0/0x1f0 [ 59.952551][ T8907] sock_sendmsg+0x98/0xc0 [ 59.956857][ T8907] sock_write_iter+0x186/0x240 [ 59.961601][ T8907] new_sync_write+0x303/0x400 [ 59.966317][ T8907] __vfs_write+0x9e/0xb0 [ 59.970555][ T8907] vfs_write+0x189/0x380 [ 59.974780][ T8907] ksys_write+0x16a/0x1a0 [ 59.979152][ T8907] __x64_sys_write+0x49/0x60 [ 59.983726][ T8907] do_syscall_64+0xc7/0x3b0 [ 59.988233][ T8907] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 59.994108][ T8907] RIP: 0033:0x4b3cdb [ 59.997992][ T8907] 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 [ 60.017570][ T8907] RSP: 002b:000000c0003b3540 EFLAGS: 00000202 ORIG_RAX: 0000000000000001 [ 60.025966][ T8907] RAX: ffffffffffffffda RBX: 000000c00002c000 RCX: 00000000004b3cdb [ 60.033912][ T8907] RDX: 0000000000000007 RSI: 000000c00000a3e0 RDI: 0000000000000006 [ 60.041858][ T8907] RBP: 000000c0003b3590 R08: 000000c00000a301 R09: 0000000000000007 [ 60.050094][ T8907] R10: 000000c000092000 R11: 0000000000000202 R12: 000000000000011e [ 60.058046][ T8907] R13: 000000c0004a2000 R14: 0000000000000007 R15: 0000000000002fd6 [ 61.141058][ T8907] Shutting down cpus with NMI [ 61.147113][ T8907] Kernel Offset: disabled [ 61.151466][ T8907] Rebooting in 86400 seconds..