[ 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 '10.128.1.18' (ECDSA) to the list of known hosts. 2020/11/09 21:52:28 fuzzer started 2020/11/09 21:52:29 dialing manager at 10.128.0.105:37665 2020/11/09 21:52:29 syscalls: 3448 2020/11/09 21:52:29 code coverage: enabled 2020/11/09 21:52:29 comparison tracing: enabled 2020/11/09 21:52:29 extra coverage: enabled 2020/11/09 21:52:29 setuid sandbox: enabled 2020/11/09 21:52:29 namespace sandbox: enabled 2020/11/09 21:52:29 Android sandbox: /sys/fs/selinux/policy does not exist 2020/11/09 21:52:29 fault injection: enabled 2020/11/09 21:52:29 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2020/11/09 21:52:29 net packet injection: enabled 2020/11/09 21:52:29 net device setup: enabled 2020/11/09 21:52:29 concurrency sanitizer: enabled 2020/11/09 21:52:29 devlink PCI setup: PCI device 0000:00:10.0 is not available 2020/11/09 21:52:29 USB emulation: enabled 2020/11/09 21:52:29 hci packet injection: enabled 2020/11/09 21:52:29 wifi device emulation: enabled 2020/11/09 21:52:29 suppressing KCSAN reports in functions: 'do_signal_stop' 'generic_write_end' 'blk_mq_rq_ctx_init' 'exit_mm' 'blk_mq_sched_dispatch_requests' '__ext4_new_inode' syzkaller login: [ 29.839066][ T8431] ================================================================== [ 29.847203][ T8431] BUG: KCSAN: data-race in __delayacct_blkio_end / __delayacct_blkio_start [ 29.855753][ T8431] [ 29.858077][ T8431] write to 0xffff888100e7b468 of 8 bytes by task 8427 on cpu 1: [ 29.865684][ T8431] __delayacct_blkio_start+0x35/0x40 [ 29.870954][ T8431] __schedule+0x18c/0x550 [ 29.875255][ T8431] schedule+0x7f/0xb0 [ 29.879222][ T8431] io_schedule+0x3b/0x50 [ 29.883449][ T8431] wait_on_page_bit_common+0x633/0x910 [ 29.888877][ T8431] filemap_fault+0x87a/0x12e0 [ 29.893528][ T8431] ext4_filemap_fault+0x4b/0x60 [ 29.898346][ T8431] do_read_fault+0x403/0x760 [ 29.902905][ T8431] handle_mm_fault+0xfeb/0x1770 [ 29.907742][ T8431] do_user_addr_fault+0x33e/0x730 [ 29.912739][ T8431] exc_page_fault+0x91/0x290 [ 29.917298][ T8431] asm_exc_page_fault+0x1e/0x30 [ 29.922111][ T8431] [ 29.924414][ T8431] read to 0xffff888100e7b468 of 8 bytes by task 8431 on cpu 0: [ 29.931925][ T8431] __delayacct_blkio_end+0x70/0xf0 [ 29.937004][ T8431] try_to_wake_up+0x107/0x470 [ 29.941652][ T8431] wake_page_function+0xd9/0x200 [ 29.946577][ T8431] __wake_up_common+0xbc/0x130 [ 29.951307][ T8431] wake_up_page_bit+0xa4/0x190 [ 29.956039][ T8431] filemap_map_pages+0x81b/0x9a0 [ 29.960943][ T8431] do_read_fault+0x233/0x760 [ 29.965523][ T8431] handle_mm_fault+0xfeb/0x1770 [ 29.970344][ T8431] do_user_addr_fault+0x33e/0x730 [ 29.975338][ T8431] exc_page_fault+0x91/0x290 [ 29.979896][ T8431] asm_exc_page_fault+0x1e/0x30 [ 29.984713][ T8431] [ 29.987011][ T8431] Reported by Kernel Concurrency Sanitizer on: [ 29.993137][ T8431] CPU: 0 PID: 8431 Comm: syz-fuzzer Not tainted 5.10.0-rc3-syzkaller #0 [ 30.001440][ T8431] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 30.011485][ T8431] ================================================================== [ 30.019520][ T8431] Kernel panic - not syncing: panic_on_warn set ... [ 30.026093][ T8431] CPU: 0 PID: 8431 Comm: syz-fuzzer Not tainted 5.10.0-rc3-syzkaller #0 [ 30.034401][ T8431] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 30.044427][ T8431] Call Trace: [ 30.047707][ T8431] dump_stack+0x116/0x15d [ 30.052009][ T8431] panic+0x1e7/0x5fa [ 30.055874][ T8431] ? vprintk_emit+0x2f2/0x370 [ 30.060521][ T8431] kcsan_report+0x67b/0x680 [ 30.065009][ T8431] ? kcsan_setup_watchpoint+0x46a/0x4d0 [ 30.070546][ T8431] ? __delayacct_blkio_end+0x70/0xf0 [ 30.075814][ T8431] ? try_to_wake_up+0x107/0x470 [ 30.080643][ T8431] ? wake_page_function+0xd9/0x200 [ 30.085740][ T8431] ? __wake_up_common+0xbc/0x130 [ 30.090645][ T8431] ? wake_up_page_bit+0xa4/0x190 [ 30.095550][ T8431] ? filemap_map_pages+0x81b/0x9a0 [ 30.100630][ T8431] ? do_read_fault+0x233/0x760 [ 30.105366][ T8431] ? handle_mm_fault+0xfeb/0x1770 [ 30.110365][ T8431] ? do_user_addr_fault+0x33e/0x730 [ 30.115540][ T8431] ? exc_page_fault+0x91/0x290 [ 30.120275][ T8431] ? asm_exc_page_fault+0x1e/0x30 [ 30.125289][ T8431] ? update_load_avg+0x1ad/0x2d0 [ 30.130199][ T8431] kcsan_setup_watchpoint+0x46a/0x4d0 [ 30.135541][ T8431] __delayacct_blkio_end+0x70/0xf0 [ 30.140637][ T8431] try_to_wake_up+0x107/0x470 [ 30.145286][ T8431] wake_page_function+0xd9/0x200 [ 30.150193][ T8431] __wake_up_common+0xbc/0x130 [ 30.154925][ T8431] wake_up_page_bit+0xa4/0x190 [ 30.159656][ T8431] filemap_map_pages+0x81b/0x9a0 [ 30.164566][ T8431] do_read_fault+0x233/0x760 [ 30.169124][ T8431] handle_mm_fault+0xfeb/0x1770 [ 30.173946][ T8431] do_user_addr_fault+0x33e/0x730 [ 30.178939][ T8431] exc_page_fault+0x91/0x290 [ 30.183499][ T8431] ? asm_exc_page_fault+0x8/0x30 [ 30.188404][ T8431] asm_exc_page_fault+0x1e/0x30 [ 30.193237][ T8431] RIP: 0033:0x41f64a [ 30.197104][ T8431] 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 [ 30.216678][ T8431] RSP: 002b:000000c00004be20 EFLAGS: 00010283 [ 30.222716][ T8431] RAX: 00007fe2ce7bd000 RBX: 0000000000000001 RCX: 0000000000040000 [ 30.231321][ T8431] RDX: 00000000013cb100 RSI: 0000000000000020 RDI: 0000000000000004 [ 30.239279][ T8431] RBP: 000000c00004be70 R08: 00000000013cb120 R09: 0000000000000033 [ 30.247228][ T8431] R10: 0000000001a77108 R11: 0000000000000042 R12: 0000000000000003 [ 30.255172][ T8431] R13: 000000c000001500 R14: 0000000000000006 R15: 0000000000000006 [ 30.263790][ T8431] Kernel Offset: disabled [ 30.268093][ T8431] Rebooting in 86400 seconds..