Warning: Permanently added '10.128.0.212' (ECDSA) to the list of known hosts. 2020/06/28 22:49:09 fuzzer started 2020/06/28 22:49:09 dialing manager at 10.128.0.105:37633 2020/06/28 22:49:09 syscalls: 3105 2020/06/28 22:49:09 code coverage: enabled 2020/06/28 22:49:09 comparison tracing: enabled 2020/06/28 22:49:09 extra coverage: enabled 2020/06/28 22:49:09 setuid sandbox: enabled 2020/06/28 22:49:09 namespace sandbox: enabled 2020/06/28 22:49:09 Android sandbox: /sys/fs/selinux/policy does not exist 2020/06/28 22:49:09 fault injection: enabled 2020/06/28 22:49:09 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2020/06/28 22:49:09 net packet injection: enabled 2020/06/28 22:49:09 net device setup: enabled 2020/06/28 22:49:09 concurrency sanitizer: enabled 2020/06/28 22:49:09 devlink PCI setup: PCI device 0000:00:10.0 is not available 2020/06/28 22:49:09 USB emulation: enabled 2020/06/28 22:49:10 suppressing KCSAN reports in functions: 'generic_write_end' 'blk_mq_dispatch_rq_list' '__xa_clear_mark' 'ext4_free_inode' '__send_signal' 'copy_process' 'dput' 'do_signal_stop' 'ext4_writepages' 'do_epoll_wait' '__ext4_new_inode' 'ext4_mark_iloc_dirty' '__delete_from_page_cache' syzkaller login: [ 41.239082][ T8651] ================================================================== [ 41.247376][ T8651] BUG: KCSAN: data-race in __mod_timer / timer_clear_idle [ 41.254453][ T8651] [ 41.256756][ T8651] write to 0xffff88812c11cb24 of 1 bytes by task 0 on cpu 1: [ 41.264210][ T8651] timer_clear_idle+0x2e/0x40 [ 41.268872][ T8651] tick_nohz_idle_retain_tick+0x3e/0x40 [ 41.274439][ T8651] do_idle+0x287/0x310 [ 41.278738][ T8651] cpu_startup_entry+0x15/0x20 [ 41.283474][ T8651] start_secondary+0xe3/0x110 [ 41.288121][ T8651] secondary_startup_64+0xa4/0xb0 [ 41.293123][ T8651] [ 41.295424][ T8651] read to 0xffff88812c11cb24 of 1 bytes by task 8651 on cpu 0: [ 41.302948][ T8651] __mod_timer+0xb87/0xf00 [ 41.307335][ T8651] mod_timer+0x1b/0x20 [ 41.311371][ T8651] sk_reset_timer+0x1f/0xa0 [ 41.315872][ T8651] tcp_rearm_rto+0x204/0x210 [ 41.320433][ T8651] tcp_write_xmit+0x1bee/0x3f40 [ 41.325255][ T8651] __tcp_push_pending_frames+0x68/0x1c0 [ 41.330790][ T8651] tcp_push+0x2da/0x2f0 [ 41.335655][ T8651] tcp_sendmsg_locked+0x1bf9/0x2200 [ 41.340854][ T8651] tcp_sendmsg+0x2c/0x40 [ 41.345068][ T8651] inet_sendmsg+0x5f/0x80 [ 41.349372][ T8651] sock_write_iter+0x1a1/0x200 [ 41.354159][ T8651] __vfs_write+0x2d8/0x340 [ 41.358656][ T8651] vfs_write+0x19b/0x350 [ 41.363041][ T8651] ksys_write+0xce/0x180 [ 41.367260][ T8651] __x64_sys_write+0x3e/0x50 [ 41.371860][ T8651] do_syscall_64+0x51/0xb0 [ 41.376260][ T8651] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 41.382401][ T8651] [ 41.384813][ T8651] Reported by Kernel Concurrency Sanitizer on: [ 41.390992][ T8651] CPU: 0 PID: 8651 Comm: syz-fuzzer Not tainted 5.8.0-rc2-syzkaller #0 [ 41.399404][ T8651] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 41.409444][ T8651] ================================================================== [ 41.417493][ T8651] Kernel panic - not syncing: panic_on_warn set ... [ 41.425179][ T8651] CPU: 0 PID: 8651 Comm: syz-fuzzer Not tainted 5.8.0-rc2-syzkaller #0 [ 41.433380][ T8651] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 41.443416][ T8651] Call Trace: [ 41.446758][ T8651] dump_stack+0x10f/0x19d [ 41.451204][ T8651] panic+0x207/0x64a [ 41.455076][ T8651] ? vprintk_emit+0x44a/0x4f0 [ 41.459795][ T8651] kcsan_report+0x684/0x690 [ 41.464448][ T8651] ? kcsan_setup_watchpoint+0x453/0x4d0 [ 41.469974][ T8651] ? __mod_timer+0xb87/0xf00 [ 41.474538][ T8651] ? mod_timer+0x1b/0x20 [ 41.478751][ T8651] ? sk_reset_timer+0x1f/0xa0 [ 41.483395][ T8651] ? tcp_rearm_rto+0x204/0x210 [ 41.488142][ T8651] ? tcp_write_xmit+0x1bee/0x3f40 [ 41.493161][ T8651] ? __tcp_push_pending_frames+0x68/0x1c0 [ 41.498848][ T8651] ? tcp_push+0x2da/0x2f0 [ 41.503154][ T8651] ? tcp_sendmsg_locked+0x1bf9/0x2200 [ 41.508501][ T8651] ? tcp_sendmsg+0x2c/0x40 [ 41.512898][ T8651] ? inet_sendmsg+0x5f/0x80 [ 41.517371][ T8651] ? sock_write_iter+0x1a1/0x200 [ 41.522277][ T8651] ? __vfs_write+0x2d8/0x340 [ 41.526836][ T8651] ? vfs_write+0x19b/0x350 [ 41.531220][ T8651] ? ksys_write+0xce/0x180 [ 41.535627][ T8651] ? __x64_sys_write+0x3e/0x50 [ 41.540487][ T8651] ? do_syscall_64+0x51/0xb0 [ 41.545059][ T8651] ? entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 41.551183][ T8651] ? __ip_queue_xmit+0x9ba/0x9e0 [ 41.556112][ T8651] ? __copy_skb_header+0x228/0x270 [ 41.561210][ T8651] kcsan_setup_watchpoint+0x453/0x4d0 [ 41.566565][ T8651] __mod_timer+0xb87/0xf00 [ 41.570973][ T8651] mod_timer+0x1b/0x20 [ 41.575111][ T8651] sk_reset_timer+0x1f/0xa0 [ 41.579591][ T8651] tcp_rearm_rto+0x204/0x210 [ 41.584161][ T8651] tcp_write_xmit+0x1bee/0x3f40 [ 41.588990][ T8651] ? check_preemption_disabled+0x51/0x140 [ 41.594717][ T8651] ? iov_iter_advance+0x1e0/0x890 [ 41.599711][ T8651] ? _copy_from_iter_full+0x1d9/0x6d0 [ 41.605245][ T8651] __tcp_push_pending_frames+0x68/0x1c0 [ 41.610761][ T8651] tcp_push+0x2da/0x2f0 [ 41.614885][ T8651] tcp_sendmsg_locked+0x1bf9/0x2200 [ 41.620054][ T8651] tcp_sendmsg+0x2c/0x40 [ 41.624266][ T8651] inet_sendmsg+0x5f/0x80 [ 41.628568][ T8651] sock_write_iter+0x1a1/0x200 [ 41.633321][ T8651] __vfs_write+0x2d8/0x340 [ 41.637707][ T8651] vfs_write+0x19b/0x350 [ 41.641921][ T8651] ksys_write+0xce/0x180 [ 41.646157][ T8651] __x64_sys_write+0x3e/0x50 [ 41.650852][ T8651] do_syscall_64+0x51/0xb0 [ 41.655398][ T8651] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 41.662909][ T8651] RIP: 0033:0x4b3cdb [ 41.666769][ T8651] Code: Bad RIP value. [ 41.670815][ T8651] RSP: 002b:000000c003049540 EFLAGS: 00000202 ORIG_RAX: 0000000000000001 [ 41.680453][ T8651] RAX: ffffffffffffffda RBX: 000000c00002e800 RCX: 00000000004b3cdb [ 41.688401][ T8651] RDX: 0000000000000008 RSI: 000000c00000a200 RDI: 0000000000000006 [ 41.696502][ T8651] RBP: 000000c003049590 R08: 000000c00000a201 R09: 0000000000000008 [ 41.705207][ T8651] R10: 000000c000094000 R11: 0000000000000202 R12: 000000000000011e [ 41.713168][ T8651] R13: 000000c000368000 R14: 0000000000000007 R15: 0000000000002078 [ 42.841532][ T8651] Shutting down cpus with NMI [ 42.847688][ T8651] Kernel Offset: disabled [ 42.852001][ T8651] Rebooting in 86400 seconds..