[ 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 '10.128.0.230' (ECDSA) to the list of known hosts. 2020/06/04 13:26:40 fuzzer started 2020/06/04 13:26:40 dialing manager at 10.128.0.105:43989 2020/06/04 13:26:42 syscalls: 3055 2020/06/04 13:26:42 code coverage: enabled 2020/06/04 13:26:42 comparison tracing: enabled 2020/06/04 13:26:42 extra coverage: enabled 2020/06/04 13:26:42 setuid sandbox: enabled 2020/06/04 13:26:42 namespace sandbox: enabled 2020/06/04 13:26:42 Android sandbox: /sys/fs/selinux/policy does not exist 2020/06/04 13:26:42 fault injection: enabled 2020/06/04 13:26:42 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2020/06/04 13:26:42 net packet injection: enabled 2020/06/04 13:26:42 net device setup: enabled 2020/06/04 13:26:42 concurrency sanitizer: enabled 2020/06/04 13:26:42 devlink PCI setup: PCI device 0000:00:10.0 is not available 2020/06/04 13:26:42 USB emulation: enabled 2020/06/04 13:26:43 adding functions to KCSAN blacklist: '__send_signal' 'ep_poll' '__ext4_new_inode' 'snd_rawmidi_kernel_write1' 'complete_signal' 'do_nanosleep' 'page_counter_charge' 'find_get_pages_range_tag' 'generic_fillattr' 'copy_process' 'generic_write_end' syzkaller login: [ 73.851920][ T8926] ================================================================== [ 73.860024][ T8926] BUG: KCSAN: data-race in mod_timer / timer_clear_idle [ 73.867030][ T8926] [ 73.869339][ T8926] write to 0xffff88812c01dca4 of 1 bytes by task 0 on cpu 0: [ 73.876726][ T8926] timer_clear_idle+0x3d/0x50 [ 73.881381][ T8926] __tick_nohz_idle_restart_tick+0x32/0x1a0 [ 73.887252][ T8926] tick_nohz_idle_exit+0x19c/0x1d0 [ 73.892341][ T8926] do_idle+0xac/0x290 [ 73.896320][ T8926] cpu_startup_entry+0x14/0x20 [ 73.901058][ T8926] rest_init+0xe4/0xeb [ 73.905189][ T8926] arch_call_rest_init+0x13/0x2b [ 73.910101][ T8926] start_kernel+0x7fe/0x823 [ 73.914594][ T8926] secondary_startup_64+0xa4/0xb0 [ 73.919599][ T8926] [ 73.921906][ T8926] read to 0xffff88812c01dca4 of 1 bytes by task 8926 on cpu 1: [ 73.929448][ T8926] mod_timer+0x631/0x830 [ 73.933669][ T8926] sk_reset_timer+0x29/0xc0 [ 73.938165][ T8926] tcp_rearm_rto+0x1ce/0x280 [ 73.942744][ T8926] tcp_event_new_data_sent+0x23f/0x260 [ 73.948194][ T8926] tcp_write_xmit+0x5c6/0x31e0 [ 73.952939][ T8926] __tcp_push_pending_frames+0x72/0x1b0 [ 73.958474][ T8926] tcp_push+0x1ec/0x3e0 [ 73.962607][ T8926] tcp_sendmsg_locked+0x1de3/0x20f0 [ 73.967779][ T8926] tcp_sendmsg+0x35/0x50 [ 73.971997][ T8926] inet_sendmsg+0x69/0x90 [ 73.976303][ T8926] sock_sendmsg+0x98/0xc0 [ 73.980608][ T8926] sock_write_iter+0x186/0x240 [ 73.985352][ T8926] new_sync_write+0x303/0x400 [ 73.990007][ T8926] __vfs_write+0x9e/0xb0 [ 73.994259][ T8926] vfs_write+0x189/0x380 [ 73.998476][ T8926] ksys_write+0x16a/0x1a0 [ 74.002778][ T8926] __x64_sys_write+0x49/0x60 [ 74.007348][ T8926] do_syscall_64+0xc7/0x3b0 [ 74.011829][ T8926] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 74.017706][ T8926] [ 74.020025][ T8926] Reported by Kernel Concurrency Sanitizer on: [ 74.026157][ T8926] CPU: 1 PID: 8926 Comm: syz-fuzzer Not tainted 5.7.0-rc1-syzkaller #0 [ 74.034452][ T8926] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 74.044480][ T8926] ================================================================== [ 74.052645][ T8926] Kernel panic - not syncing: panic_on_warn set ... [ 74.059357][ T8926] CPU: 1 PID: 8926 Comm: syz-fuzzer Not tainted 5.7.0-rc1-syzkaller #0 [ 74.067571][ T8926] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 74.077694][ T8926] Call Trace: [ 74.080974][ T8926] dump_stack+0x11d/0x187 [ 74.085286][ T8926] panic+0x210/0x640 [ 74.089164][ T8926] ? vprintk_func+0x89/0x13a [ 74.093746][ T8926] kcsan_report.cold+0xc/0x1a [ 74.098420][ T8926] kcsan_setup_watchpoint+0x3fb/0x440 [ 74.103792][ T8926] mod_timer+0x631/0x830 [ 74.108033][ T8926] sk_reset_timer+0x29/0xc0 [ 74.112516][ T8926] tcp_rearm_rto+0x1ce/0x280 [ 74.117088][ T8926] tcp_event_new_data_sent+0x23f/0x260 [ 74.122544][ T8926] tcp_write_xmit+0x5c6/0x31e0 [ 74.127295][ T8926] ? iov_iter_advance+0x21c/0x900 [ 74.132333][ T8926] __tcp_push_pending_frames+0x72/0x1b0 [ 74.137854][ T8926] tcp_push+0x1ec/0x3e0 [ 74.142008][ T8926] tcp_sendmsg_locked+0x1de3/0x20f0 [ 74.147192][ T8926] ? aa_label_sk_perm.part.0+0x220/0x290 [ 74.152805][ T8926] tcp_sendmsg+0x35/0x50 [ 74.157027][ T8926] inet_sendmsg+0x69/0x90 [ 74.161341][ T8926] ? inet_send_prepare+0x1f0/0x1f0 [ 74.166431][ T8926] sock_sendmsg+0x98/0xc0 [ 74.170756][ T8926] sock_write_iter+0x186/0x240 [ 74.175504][ T8926] new_sync_write+0x303/0x400 [ 74.180166][ T8926] __vfs_write+0x9e/0xb0 [ 74.184385][ T8926] vfs_write+0x189/0x380 [ 74.188605][ T8926] ksys_write+0x16a/0x1a0 [ 74.192911][ T8926] __x64_sys_write+0x49/0x60 [ 74.197501][ T8926] do_syscall_64+0xc7/0x3b0 [ 74.201997][ T8926] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 74.207890][ T8926] RIP: 0033:0x4b3cdb [ 74.211776][ T8926] 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 [ 74.231382][ T8926] RSP: 002b:000000c000ee5540 EFLAGS: 00000202 ORIG_RAX: 0000000000000001 [ 74.239784][ T8926] RAX: ffffffffffffffda RBX: 000000c00002e800 RCX: 00000000004b3cdb [ 74.247732][ T8926] RDX: 0000000000000007 RSI: 000000c00000a3e0 RDI: 0000000000000006 [ 74.255679][ T8926] RBP: 000000c000ee5590 R08: 000000c00000a301 R09: 0000000000000007 [ 74.263642][ T8926] R10: 000000c0000ae000 R11: 0000000000000202 R12: 000000000000011e [ 74.271598][ T8926] R13: 000000c000238000 R14: 0000000000000007 R15: 000000000000488a [ 75.355092][ T8926] Shutting down cpus with NMI [ 75.361459][ T8926] Kernel Offset: disabled [ 75.365776][ T8926] Rebooting in 86400 seconds..