[ 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 '10.128.15.196' (ECDSA) to the list of known hosts. 2020/11/18 18:30:48 fuzzer started 2020/11/18 18:30:48 dialing manager at 10.128.0.105:45583 2020/11/18 18:30:52 syscalls: 3448 2020/11/18 18:30:52 code coverage: enabled 2020/11/18 18:30:52 comparison tracing: enabled 2020/11/18 18:30:52 extra coverage: enabled 2020/11/18 18:30:52 setuid sandbox: enabled 2020/11/18 18:30:52 namespace sandbox: enabled 2020/11/18 18:30:52 Android sandbox: /sys/fs/selinux/policy does not exist 2020/11/18 18:30:52 fault injection: enabled 2020/11/18 18:30:52 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2020/11/18 18:30:52 net packet injection: enabled 2020/11/18 18:30:52 net device setup: enabled 2020/11/18 18:30:52 concurrency sanitizer: enabled 2020/11/18 18:30:52 devlink PCI setup: PCI device 0000:00:10.0 is not available 2020/11/18 18:30:52 USB emulation: enabled 2020/11/18 18:30:52 hci packet injection: enabled 2020/11/18 18:30:52 wifi device emulation: enabled 2020/11/18 18:30:53 suppressing KCSAN reports in functions: 'ext4_writepages' '__mod_timer' 'do_signal_stop' '__xa_clear_mark' 'do_select' 'ext4_free_inodes_count' 'generic_file_buffered_read' 'ext4_mark_iloc_dirty' 'blk_mq_sched_dispatch_requests' 'find_get_pages_range_tag' 'ext4_ext_handle_unwritten_extents' 'dd_has_work' 'generic_write_end' 'wg_packet_decrypt_worker' 'blk_mq_dispatch_rq_list' 'blk_mq_rq_ctx_init' 'n_tty_receive_buf_common' 'ext4_free_inode' 'exit_signals' 'alloc_pid' '__ext4_new_inode' 'snd_rawmidi_poll' 'do_sys_poll' 'pcpu_alloc' syzkaller login: [ 40.731156][ T8435] ================================================================== [ 40.739336][ T8435] BUG: KCSAN: data-race in __delayacct_blkio_end / __delayacct_blkio_start [ 40.747888][ T8435] [ 40.750186][ T8435] write to 0xffff888100d865a8 of 8 bytes by task 8433 on cpu 1: [ 40.757788][ T8435] __delayacct_blkio_start+0x35/0x40 [ 40.763046][ T8435] __schedule+0x18c/0x550 [ 40.767362][ T8435] schedule+0x7f/0xb0 [ 40.771330][ T8435] io_schedule+0x3b/0x50 [ 40.775543][ T8435] wait_on_page_bit_common+0x633/0x910 [ 40.780972][ T8435] filemap_fault+0x87a/0x12e0 [ 40.785622][ T8435] ext4_filemap_fault+0x4b/0x60 [ 40.790448][ T8435] do_read_fault+0x403/0x760 [ 40.795020][ T8435] handle_mm_fault+0xfeb/0x1770 [ 40.799844][ T8435] do_user_addr_fault+0x33e/0x730 [ 40.804971][ T8435] exc_page_fault+0x91/0x290 [ 40.809566][ T8435] asm_exc_page_fault+0x1e/0x30 [ 40.814379][ T8435] [ 40.816718][ T8435] read to 0xffff888100d865a8 of 8 bytes by task 8435 on cpu 0: [ 40.824234][ T8435] __delayacct_blkio_end+0x70/0xf0 [ 40.829315][ T8435] try_to_wake_up+0x107/0x470 [ 40.833962][ T8435] wake_page_function+0xd9/0x200 [ 40.838868][ T8435] __wake_up_common+0xbc/0x130 [ 40.843615][ T8435] wake_up_page_bit+0xa4/0x190 [ 40.848366][ T8435] filemap_map_pages+0x81b/0x9a0 [ 40.853271][ T8435] do_read_fault+0x233/0x760 [ 40.857830][ T8435] handle_mm_fault+0xfeb/0x1770 [ 40.862658][ T8435] do_user_addr_fault+0x33e/0x730 [ 40.867658][ T8435] exc_page_fault+0x91/0x290 [ 40.872221][ T8435] asm_exc_page_fault+0x1e/0x30 [ 40.877057][ T8435] [ 40.879353][ T8435] Reported by Kernel Concurrency Sanitizer on: [ 40.885490][ T8435] CPU: 0 PID: 8435 Comm: syz-fuzzer Not tainted 5.10.0-rc4-syzkaller #0 [ 40.893778][ T8435] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 40.903817][ T8435] ================================================================== [ 40.911845][ T8435] Kernel panic - not syncing: panic_on_warn set ... [ 40.918417][ T8435] CPU: 0 PID: 8435 Comm: syz-fuzzer Not tainted 5.10.0-rc4-syzkaller #0 [ 40.926722][ T8435] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 40.936759][ T8435] Call Trace: [ 40.940037][ T8435] dump_stack+0x116/0x15d [ 40.944338][ T8435] panic+0x1e7/0x5fa [ 40.948206][ T8435] ? vprintk_emit+0x2f2/0x370 [ 40.952868][ T8435] kcsan_report+0x67b/0x680 [ 40.958313][ T8435] ? kcsan_setup_watchpoint+0x46a/0x4d0 [ 40.963845][ T8435] ? __delayacct_blkio_end+0x70/0xf0 [ 40.969100][ T8435] ? try_to_wake_up+0x107/0x470 [ 40.973935][ T8435] ? wake_page_function+0xd9/0x200 [ 40.979016][ T8435] ? __wake_up_common+0xbc/0x130 [ 40.983933][ T8435] ? wake_up_page_bit+0xa4/0x190 [ 40.988840][ T8435] ? filemap_map_pages+0x81b/0x9a0 [ 40.993923][ T8435] ? do_read_fault+0x233/0x760 [ 40.998655][ T8435] ? handle_mm_fault+0xfeb/0x1770 [ 41.003649][ T8435] ? do_user_addr_fault+0x33e/0x730 [ 41.008829][ T8435] ? exc_page_fault+0x91/0x290 [ 41.013575][ T8435] ? asm_exc_page_fault+0x1e/0x30 [ 41.018575][ T8435] ? rt_mutex_setprio+0x250/0x470 [ 41.023580][ T8435] ? __rcu_read_unlock+0x51/0x220 [ 41.028592][ T8435] kcsan_setup_watchpoint+0x46a/0x4d0 [ 41.033934][ T8435] __delayacct_blkio_end+0x70/0xf0 [ 41.039015][ T8435] try_to_wake_up+0x107/0x470 [ 41.043664][ T8435] wake_page_function+0xd9/0x200 [ 41.048573][ T8435] __wake_up_common+0xbc/0x130 [ 41.053307][ T8435] wake_up_page_bit+0xa4/0x190 [ 41.058058][ T8435] filemap_map_pages+0x81b/0x9a0 [ 41.062981][ T8435] do_read_fault+0x233/0x760 [ 41.067626][ T8435] handle_mm_fault+0xfeb/0x1770 [ 41.072449][ T8435] do_user_addr_fault+0x33e/0x730 [ 41.077455][ T8435] exc_page_fault+0x91/0x290 [ 41.082028][ T8435] ? asm_exc_page_fault+0x8/0x30 [ 41.086949][ T8435] asm_exc_page_fault+0x1e/0x30 [ 41.091780][ T8435] RIP: 0033:0x41f64a [ 41.095648][ T8435] 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 [ 41.115228][ T8435] RSP: 002b:000000c00008fe20 EFLAGS: 00010287 [ 41.121265][ T8435] RAX: 00007fdfe1fd3000 RBX: 0000000000000001 RCX: 0000000000040000 [ 41.129222][ T8435] RDX: 000000000198b0e0 RSI: 0000000000034f30 RDI: 0000000000000006 [ 41.137162][ T8435] RBP: 000000c00008fe70 R08: 00000000019c0010 R09: 0000000000000036 [ 41.145103][ T8435] R10: 0000000001a770e8 R11: 0000000000000046 R12: 0000000000000003 [ 41.153057][ T8435] R13: 000000c00009c180 R14: 000000000000000f R15: 000000000000145b [ 42.184734][ T8435] Shutting down cpus with NMI [ 42.189956][ T8435] Kernel Offset: disabled [ 42.194295][ T8435] Rebooting in 86400 seconds..