[ 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 '10.128.10.16' (ECDSA) to the list of known hosts. 2020/06/13 11:53:36 fuzzer started 2020/06/13 11:53:37 dialing manager at 10.128.0.105:43693 2020/06/13 11:53:40 syscalls: 3085 2020/06/13 11:53:40 code coverage: enabled 2020/06/13 11:53:40 comparison tracing: enabled 2020/06/13 11:53:40 extra coverage: enabled 2020/06/13 11:53:40 setuid sandbox: enabled 2020/06/13 11:53:40 namespace sandbox: enabled 2020/06/13 11:53:40 Android sandbox: /sys/fs/selinux/policy does not exist 2020/06/13 11:53:40 fault injection: enabled 2020/06/13 11:53:40 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2020/06/13 11:53:40 net packet injection: enabled 2020/06/13 11:53:40 net device setup: enabled 2020/06/13 11:53:40 concurrency sanitizer: enabled 2020/06/13 11:53:40 devlink PCI setup: PCI device 0000:00:10.0 is not available 2020/06/13 11:53:40 USB emulation: enabled syzkaller login: [ 54.279076][ T8912] KCSAN: could not find function: '_find_next_bit' 2020/06/13 11:53:43 adding functions to KCSAN blacklist: '__send_signal' 'do_nanosleep' 'run_timer_softirq' 'file_update_time' 'find_get_pages_range_tag' '_find_next_bit' '__ext4_new_inode' 'ep_poll' 'generic_fillattr' 'blk_mq_dispatch_rq_list' 'xas_clear_mark' 'futex_wait_queue_me' 'ext4_free_inodes_count' 'generic_write_end' 'pcpu_alloc' 'copy_process' [ 97.281632][ T8901] ================================================================== [ 97.289744][ T8901] BUG: KCSAN: data-race in mod_timer / timer_clear_idle [ 97.296671][ T8901] [ 97.298982][ T8901] write to 0xffff88812c11dca4 of 1 bytes by task 0 on cpu 1: [ 97.306352][ T8901] timer_clear_idle+0x3d/0x50 [ 97.311010][ T8901] __tick_nohz_idle_restart_tick+0x32/0x1a0 [ 97.316880][ T8901] tick_nohz_idle_exit+0x19c/0x1d0 [ 97.321979][ T8901] do_idle+0xac/0x290 [ 97.325937][ T8901] cpu_startup_entry+0x14/0x20 [ 97.330687][ T8901] start_secondary+0x169/0x1b0 [ 97.335452][ T8901] secondary_startup_64+0xa4/0xb0 [ 97.340442][ T8901] [ 97.342751][ T8901] read to 0xffff88812c11dca4 of 1 bytes by task 8901 on cpu 0: [ 97.350289][ T8901] mod_timer+0x631/0x830 [ 97.354527][ T8901] sk_reset_timer+0x29/0xc0 [ 97.359021][ T8901] tcp_rearm_rto+0x1ce/0x280 [ 97.363601][ T8901] tcp_event_new_data_sent+0x23f/0x260 [ 97.369133][ T8901] tcp_write_xmit+0x5c6/0x31e0 [ 97.373873][ T8901] __tcp_push_pending_frames+0x72/0x1b0 [ 97.379675][ T8901] tcp_push+0x1ec/0x3e0 [ 97.383826][ T8901] tcp_sendmsg_locked+0x1de3/0x20f0 [ 97.389000][ T8901] tcp_sendmsg+0x35/0x50 [ 97.393224][ T8901] inet_sendmsg+0x69/0x90 [ 97.397537][ T8901] sock_sendmsg+0x98/0xc0 [ 97.401850][ T8901] sock_write_iter+0x186/0x240 [ 97.406589][ T8901] new_sync_write+0x303/0x400 [ 97.411240][ T8901] __vfs_write+0x9e/0xb0 [ 97.415473][ T8901] vfs_write+0x189/0x380 [ 97.419686][ T8901] ksys_write+0x16a/0x1a0 [ 97.424509][ T8901] __x64_sys_write+0x49/0x60 [ 97.429078][ T8901] do_syscall_64+0xc7/0x3b0 [ 97.433553][ T8901] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 97.439410][ T8901] [ 97.441724][ T8901] Reported by Kernel Concurrency Sanitizer on: [ 97.447863][ T8901] CPU: 0 PID: 8901 Comm: syz-fuzzer Not tainted 5.7.0-rc1-syzkaller #0 [ 97.456095][ T8901] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 97.466175][ T8901] ================================================================== [ 97.474209][ T8901] Kernel panic - not syncing: panic_on_warn set ... [ 97.480773][ T8901] CPU: 0 PID: 8901 Comm: syz-fuzzer Not tainted 5.7.0-rc1-syzkaller #0 [ 97.488998][ T8901] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 97.499035][ T8901] Call Trace: [ 97.502313][ T8901] dump_stack+0x11d/0x187 [ 97.506623][ T8901] panic+0x210/0x640 [ 97.510510][ T8901] ? vprintk_func+0x89/0x13a [ 97.515078][ T8901] kcsan_report.cold+0xc/0x1a [ 97.519734][ T8901] kcsan_setup_watchpoint+0x3fb/0x440 [ 97.525084][ T8901] mod_timer+0x631/0x830 [ 97.529308][ T8901] sk_reset_timer+0x29/0xc0 [ 97.533800][ T8901] tcp_rearm_rto+0x1ce/0x280 [ 97.538369][ T8901] tcp_event_new_data_sent+0x23f/0x260 [ 97.543811][ T8901] tcp_write_xmit+0x5c6/0x31e0 [ 97.548560][ T8901] ? iov_iter_advance+0x21c/0x900 [ 97.553565][ T8901] __tcp_push_pending_frames+0x72/0x1b0 [ 97.559085][ T8901] tcp_push+0x1ec/0x3e0 [ 97.563231][ T8901] tcp_sendmsg_locked+0x1de3/0x20f0 [ 97.568410][ T8901] ? aa_label_sk_perm.part.0+0x220/0x290 [ 97.574035][ T8901] tcp_sendmsg+0x35/0x50 [ 97.578256][ T8901] inet_sendmsg+0x69/0x90 [ 97.582574][ T8901] ? inet_send_prepare+0x1f0/0x1f0 [ 97.588367][ T8901] sock_sendmsg+0x98/0xc0 [ 97.592685][ T8901] sock_write_iter+0x186/0x240 [ 97.597455][ T8901] new_sync_write+0x303/0x400 [ 97.602114][ T8901] __vfs_write+0x9e/0xb0 [ 97.606372][ T8901] vfs_write+0x189/0x380 [ 97.610590][ T8901] ksys_write+0x16a/0x1a0 [ 97.614913][ T8901] __x64_sys_write+0x49/0x60 [ 97.619501][ T8901] do_syscall_64+0xc7/0x3b0 [ 97.623988][ T8901] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 97.629869][ T8901] RIP: 0033:0x4b3cdb [ 97.633758][ T8901] 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 [ 97.653682][ T8901] RSP: 002b:000000c000643540 EFLAGS: 00000202 ORIG_RAX: 0000000000000001 [ 97.662073][ T8901] RAX: ffffffffffffffda RBX: 000000c00002c000 RCX: 00000000004b3cdb [ 97.670020][ T8901] RDX: 0000000000000007 RSI: 000000c00000a200 RDI: 0000000000000006 [ 97.677977][ T8901] RBP: 000000c000643590 R08: 000000c00000a201 R09: 0000000000000007 [ 97.685927][ T8901] R10: 000000c000100000 R11: 0000000000000202 R12: 000000000000011e [ 97.695371][ T8901] R13: 000000c00033e000 R14: 0000000000000007 R15: 0000000000006d32 [ 98.778726][ T8901] Shutting down cpus with NMI [ 98.784072][ T8901] Kernel Offset: disabled [ 98.788400][ T8901] Rebooting in 86400 seconds..