[ 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 '10.128.0.238' (ECDSA) to the list of known hosts. 2020/06/02 12:26:28 fuzzer started 2020/06/02 12:26:29 dialing manager at 10.128.0.105:37135 2020/06/02 12:26:29 syscalls: 3055 2020/06/02 12:26:29 code coverage: enabled 2020/06/02 12:26:29 comparison tracing: enabled 2020/06/02 12:26:29 extra coverage: enabled 2020/06/02 12:26:29 setuid sandbox: enabled 2020/06/02 12:26:29 namespace sandbox: enabled 2020/06/02 12:26:29 Android sandbox: /sys/fs/selinux/policy does not exist 2020/06/02 12:26:29 fault injection: enabled 2020/06/02 12:26:29 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2020/06/02 12:26:29 net packet injection: enabled 2020/06/02 12:26:29 net device setup: enabled 2020/06/02 12:26:29 concurrency sanitizer: enabled 2020/06/02 12:26:29 devlink PCI setup: PCI device 0000:00:10.0 is not available 2020/06/02 12:26:29 USB emulation: enabled syzkaller login: [ 52.597146][ T8924] KCSAN: could not find function: '_find_next_bit' 2020/06/02 12:26:30 adding functions to KCSAN blacklist: 'find_get_pages_range_tag' '_find_next_bit' 'ep_poll' 'copy_process' [ 56.451013][ T8925] ================================================================== [ 56.459790][ T8925] BUG: KCSAN: data-race in mod_timer / timer_clear_idle [ 56.467844][ T8925] [ 56.470324][ T8925] write to 0xffff88812c11dca4 of 1 bytes by task 0 on cpu 1: [ 56.478922][ T8925] timer_clear_idle+0x3d/0x50 [ 56.483840][ T8925] __tick_nohz_idle_restart_tick+0x32/0x1a0 [ 56.490552][ T8925] tick_nohz_idle_exit+0x19c/0x1d0 [ 56.496163][ T8925] do_idle+0xac/0x290 [ 56.500392][ T8925] cpu_startup_entry+0x14/0x20 [ 56.505199][ T8925] start_secondary+0x169/0x1b0 [ 56.510265][ T8925] secondary_startup_64+0xa4/0xb0 [ 56.516156][ T8925] [ 56.518580][ T8925] read to 0xffff88812c11dca4 of 1 bytes by task 8925 on cpu 0: [ 56.527227][ T8925] mod_timer+0x631/0x830 [ 56.532583][ T8925] sk_reset_timer+0x29/0xc0 [ 56.537315][ T8925] tcp_rearm_rto+0x1ce/0x280 [ 56.542772][ T8925] tcp_event_new_data_sent+0x23f/0x260 [ 56.548780][ T8925] tcp_write_xmit+0x5c6/0x31e0 [ 56.553579][ T8925] __tcp_push_pending_frames+0x72/0x1b0 [ 56.559246][ T8925] tcp_push+0x1ec/0x3e0 [ 56.563488][ T8925] tcp_sendmsg_locked+0x1de3/0x20f0 [ 56.568827][ T8925] tcp_sendmsg+0x35/0x50 [ 56.573240][ T8925] inet_sendmsg+0x69/0x90 [ 56.577821][ T8925] sock_sendmsg+0x98/0xc0 [ 56.582578][ T8925] sock_write_iter+0x186/0x240 [ 56.587567][ T8925] new_sync_write+0x303/0x400 [ 56.592363][ T8925] __vfs_write+0x9e/0xb0 [ 56.596653][ T8925] vfs_write+0x189/0x380 [ 56.601118][ T8925] ksys_write+0x16a/0x1a0 [ 56.605476][ T8925] __x64_sys_write+0x49/0x60 [ 56.610533][ T8925] do_syscall_64+0xc7/0x3b0 [ 56.615113][ T8925] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 56.621250][ T8925] [ 56.623785][ T8925] Reported by Kernel Concurrency Sanitizer on: [ 56.630285][ T8925] CPU: 0 PID: 8925 Comm: syz-fuzzer Not tainted 5.7.0-rc1-syzkaller #0 [ 56.639522][ T8925] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 56.649888][ T8925] ================================================================== [ 56.658292][ T8925] Kernel panic - not syncing: panic_on_warn set ... [ 56.665652][ T8925] CPU: 0 PID: 8925 Comm: syz-fuzzer Not tainted 5.7.0-rc1-syzkaller #0 [ 56.674088][ T8925] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 56.684807][ T8925] Call Trace: [ 56.688113][ T8925] dump_stack+0x11d/0x187 [ 56.692758][ T8925] panic+0x210/0x640 [ 56.696776][ T8925] ? vprintk_func+0x89/0x13a [ 56.702176][ T8925] kcsan_report.cold+0xc/0x1a [ 56.707256][ T8925] kcsan_setup_watchpoint+0x3fb/0x440 [ 56.713080][ T8925] mod_timer+0x631/0x830 [ 56.718274][ T8925] sk_reset_timer+0x29/0xc0 [ 56.723359][ T8925] tcp_rearm_rto+0x1ce/0x280 [ 56.728084][ T8925] tcp_event_new_data_sent+0x23f/0x260 [ 56.733630][ T8925] tcp_write_xmit+0x5c6/0x31e0 [ 56.738580][ T8925] ? iov_iter_advance+0x21c/0x900 [ 56.743647][ T8925] __tcp_push_pending_frames+0x72/0x1b0 [ 56.749391][ T8925] tcp_push+0x1ec/0x3e0 [ 56.753866][ T8925] tcp_sendmsg_locked+0x1de3/0x20f0 [ 56.759145][ T8925] ? aa_label_sk_perm.part.0+0x220/0x290 [ 56.765287][ T8925] tcp_sendmsg+0x35/0x50 [ 56.769547][ T8925] inet_sendmsg+0x69/0x90 [ 56.774437][ T8925] ? inet_send_prepare+0x1f0/0x1f0 [ 56.779894][ T8925] sock_sendmsg+0x98/0xc0 [ 56.784332][ T8925] sock_write_iter+0x186/0x240 [ 56.789106][ T8925] new_sync_write+0x303/0x400 [ 56.793906][ T8925] __vfs_write+0x9e/0xb0 [ 56.798142][ T8925] vfs_write+0x189/0x380 [ 56.802662][ T8925] ksys_write+0x16a/0x1a0 [ 56.807038][ T8925] __x64_sys_write+0x49/0x60 [ 56.811798][ T8925] do_syscall_64+0xc7/0x3b0 [ 56.816713][ T8925] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 56.822621][ T8925] RIP: 0033:0x4b3cdb [ 56.826534][ T8925] 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 [ 56.846968][ T8925] RSP: 002b:000000c000bf3540 EFLAGS: 00000202 ORIG_RAX: 0000000000000001 [ 56.855583][ T8925] RAX: ffffffffffffffda RBX: 000000c00002e800 RCX: 00000000004b3cdb [ 56.863885][ T8925] RDX: 0000000000000007 RSI: 000000c00000a3e0 RDI: 0000000000000006 [ 56.871931][ T8925] RBP: 000000c000bf3590 R08: 000000c00000a301 R09: 0000000000000007 [ 56.880198][ T8925] R10: 000000c0000ac000 R11: 0000000000000202 R12: 000000000000011e [ 56.888346][ T8925] R13: 000000c000218000 R14: 000000000000000f R15: 00000000000004c1 [ 57.975835][ T8925] Shutting down cpus with NMI [ 57.982850][ T8925] Kernel Offset: disabled [ 57.987208][ T8925] Rebooting in 86400 seconds..