[ 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 '10.128.0.180' (ECDSA) to the list of known hosts. 2020/10/29 19:41:21 fuzzer started 2020/10/29 19:41:22 dialing manager at 10.128.0.105:40519 2020/10/29 19:41:22 syscalls: 3448 2020/10/29 19:41:22 code coverage: enabled 2020/10/29 19:41:22 comparison tracing: enabled 2020/10/29 19:41:22 extra coverage: enabled 2020/10/29 19:41:22 setuid sandbox: enabled 2020/10/29 19:41:22 namespace sandbox: enabled 2020/10/29 19:41:22 Android sandbox: /sys/fs/selinux/policy does not exist 2020/10/29 19:41:22 fault injection: enabled 2020/10/29 19:41:22 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2020/10/29 19:41:22 net packet injection: enabled 2020/10/29 19:41:22 net device setup: enabled 2020/10/29 19:41:22 concurrency sanitizer: enabled 2020/10/29 19:41:22 devlink PCI setup: PCI device 0000:00:10.0 is not available 2020/10/29 19:41:22 USB emulation: enabled 2020/10/29 19:41:22 hci packet injection: enabled 2020/10/29 19:41:22 wifi device emulation: enabled 2020/10/29 19:41:26 suppressing KCSAN reports in functions: 'xas_clear_mark' 'wg_packet_send_staged_packets' '__xa_clear_mark' 'ext4_mb_find_by_goal' 'blk_mq_sched_dispatch_requests' 'n_tty_receive_buf_common' 'add_input_randomness' 'futex_wait_queue_me' '__send_signal' 'ext4_free_inodes_count' 'ext4_mark_iloc_dirty' 'wbt_done' 'ext4_mb_good_group' 'expire_timers' 'dd_has_work' 'pcpu_alloc' 'filemap_map_pages' 'snd_rawmidi_poll' 'do_signal_stop' 'blk_mq_rq_ctx_init' 'find_get_pages_range_tag' 'do_nanosleep' 'generic_write_end' 'exit_mm' '__io_cqring_fill_event' '__ext4_new_inode' 'ext4_free_inode' 'do_select' '__mark_inode_dirty' 'blk_mq_dispatch_rq_list' 'do_epoll_ctl' 'lru_add_drain_all' 'alloc_pid' 'blk_mq_do_dispatch_sched' syzkaller login: [ 34.969546][ T8448] ================================================================== [ 34.977847][ T8448] BUG: KCSAN: data-race in __delayacct_blkio_end / __delayacct_blkio_start [ 34.986407][ T8448] [ 34.988715][ T8448] write to 0xffff888100c82508 of 8 bytes by task 8456 on cpu 1: [ 34.996330][ T8448] __delayacct_blkio_start+0x35/0x40 [ 35.001603][ T8448] __schedule+0x18c/0x550 [ 35.005916][ T8448] schedule+0x7f/0xb0 [ 35.009872][ T8448] io_schedule+0x3b/0x50 [ 35.014086][ T8448] wait_on_page_bit_common+0x633/0x910 [ 35.019531][ T8448] filemap_fault+0x87a/0x12e0 [ 35.024191][ T8448] ext4_filemap_fault+0x4b/0x60 [ 35.029013][ T8448] do_read_fault+0x403/0x760 [ 35.033572][ T8448] handle_mm_fault+0xfeb/0x1770 [ 35.038394][ T8448] do_user_addr_fault+0x33e/0x730 [ 35.043396][ T8448] exc_page_fault+0x91/0x290 [ 35.047960][ T8448] asm_exc_page_fault+0x1e/0x30 [ 35.052774][ T8448] [ 35.055096][ T8448] read to 0xffff888100c82508 of 8 bytes by task 8448 on cpu 0: [ 35.062609][ T8448] __delayacct_blkio_end+0x70/0xf0 [ 35.067690][ T8448] try_to_wake_up+0x107/0x470 [ 35.072334][ T8448] wake_page_function+0xd9/0x200 [ 35.077241][ T8448] __wake_up_common+0xbc/0x130 [ 35.081974][ T8448] wake_up_page_bit+0xa4/0x190 [ 35.086712][ T8448] filemap_map_pages+0x81b/0x9a0 [ 35.091617][ T8448] do_read_fault+0x233/0x760 [ 35.096196][ T8448] handle_mm_fault+0xfeb/0x1770 [ 35.101033][ T8448] do_user_addr_fault+0x33e/0x730 [ 35.106028][ T8448] exc_page_fault+0x91/0x290 [ 35.110586][ T8448] asm_exc_page_fault+0x1e/0x30 [ 35.115420][ T8448] [ 35.117718][ T8448] Reported by Kernel Concurrency Sanitizer on: [ 35.123856][ T8448] CPU: 0 PID: 8448 Comm: syz-fuzzer Not tainted 5.10.0-rc1-syzkaller #0 [ 35.132145][ T8448] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 35.142168][ T8448] ================================================================== [ 35.150215][ T8448] Kernel panic - not syncing: panic_on_warn set ... [ 35.156788][ T8448] CPU: 0 PID: 8448 Comm: syz-fuzzer Not tainted 5.10.0-rc1-syzkaller #0 [ 35.165078][ T8448] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 35.175102][ T8448] Call Trace: [ 35.178364][ T8448] dump_stack+0x116/0x15d [ 35.182665][ T8448] panic+0x1e7/0x5fa [ 35.186554][ T8448] ? vprintk_emit+0x2f2/0x370 [ 35.191202][ T8448] kcsan_report+0x67b/0x680 [ 35.195679][ T8448] ? kcsan_setup_watchpoint+0x46a/0x4d0 [ 35.201221][ T8448] ? __delayacct_blkio_end+0x70/0xf0 [ 35.206476][ T8448] ? try_to_wake_up+0x107/0x470 [ 35.211297][ T8448] ? wake_page_function+0xd9/0x200 [ 35.216386][ T8448] ? __wake_up_common+0xbc/0x130 [ 35.221298][ T8448] ? wake_up_page_bit+0xa4/0x190 [ 35.226204][ T8448] ? filemap_map_pages+0x81b/0x9a0 [ 35.231284][ T8448] ? do_read_fault+0x233/0x760 [ 35.236015][ T8448] ? handle_mm_fault+0xfeb/0x1770 [ 35.241010][ T8448] ? do_user_addr_fault+0x33e/0x730 [ 35.246178][ T8448] ? exc_page_fault+0x91/0x290 [ 35.250926][ T8448] ? asm_exc_page_fault+0x1e/0x30 [ 35.255923][ T8448] ? update_load_avg+0x1ad/0x2d0 [ 35.260832][ T8448] kcsan_setup_watchpoint+0x46a/0x4d0 [ 35.266176][ T8448] __delayacct_blkio_end+0x70/0xf0 [ 35.271256][ T8448] try_to_wake_up+0x107/0x470 [ 35.275904][ T8448] wake_page_function+0xd9/0x200 [ 35.280811][ T8448] __wake_up_common+0xbc/0x130 [ 35.285545][ T8448] wake_up_page_bit+0xa4/0x190 [ 35.290279][ T8448] filemap_map_pages+0x81b/0x9a0 [ 35.295186][ T8448] do_read_fault+0x233/0x760 [ 35.299743][ T8448] handle_mm_fault+0xfeb/0x1770 [ 35.304564][ T8448] do_user_addr_fault+0x33e/0x730 [ 35.309561][ T8448] exc_page_fault+0x91/0x290 [ 35.314137][ T8448] ? asm_exc_page_fault+0x8/0x30 [ 35.319056][ T8448] asm_exc_page_fault+0x1e/0x30 [ 35.323875][ T8448] RIP: 0033:0x41f64a [ 35.327740][ T8448] Code: 31 ff eb 09 48 ff c7 d1 eb 48 83 c6 08 48 83 ff 08 0f 8d f3 00 00 00 48 39 ce 0f 83 ea 00 00 00 0f ba e3 00 73 de 4c 8d 04 16 <4d> 8b 00 4d 85 c0 74 d2 48 89 7c 24 40 4c 89 44 24 38 48 89 74 24 [ 35.347312][ T8448] RSP: 002b:000000c0000cde18 EFLAGS: 00010283 [ 35.353346][ T8448] RAX: 00007f6010211000 RBX: 0000000000000009 RCX: 0000000000040000 [ 35.361302][ T8448] RDX: 000000000160b100 RSI: 0000000000004f20 RDI: 0000000000000004 [ 35.369259][ T8448] RBP: 000000c0000cde68 R08: 0000000001610020 R09: 0000000000000032 [ 35.377200][ T8448] R10: 0000000000010000 R11: 0000000000000008 R12: 00000000011f1460 [ 35.385141][ T8448] R13: 0000000000eca780 R14: 0000000000000005 R15: 0000000000000005 [ 36.456619][ T8448] Shutting down cpus with NMI [ 36.461951][ T8448] Kernel Offset: disabled [ 36.466257][ T8448] Rebooting in 86400 seconds..