[ 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 '10.128.10.18' (ECDSA) to the list of known hosts. 2020/07/03 11:58:14 fuzzer started 2020/07/03 11:58:15 dialing manager at 10.128.0.105:41811 2020/07/03 11:58:15 checking machine... 2020/07/03 11:58:15 checking revisions... 2020/07/03 11:58:15 testing simple program... 2020/07/03 11:58:15 building call list... syzkaller login: [ 30.678131][ T8662] IPVS: ftp: loaded support on port[0] = 21 [ 30.965346][ T21] tipc: TX() has been purged, node left! [ 32.145733][ T8646] ================================================================== [ 32.154221][ T8646] BUG: KCSAN: data-race in __delayacct_blkio_end / __delayacct_blkio_start [ 32.162885][ T8646] [ 32.165192][ T8646] write to 0xffff88812aa4afa8 of 8 bytes by task 8650 on cpu 1: [ 32.172793][ T8646] __delayacct_blkio_start+0x35/0x40 [ 32.178307][ T8646] __schedule+0x18d/0x560 [ 32.183829][ T8646] schedule+0x91/0xd0 [ 32.187785][ T8646] io_schedule+0x3b/0x50 [ 32.192049][ T8646] wait_on_page_bit_common+0x484/0x760 [ 32.197499][ T8646] filemap_fault+0x7f2/0x11e0 [ 32.202149][ T8646] ext4_filemap_fault+0x4b/0x60 [ 32.206969][ T8646] do_read_fault+0x41f/0x730 [ 32.211527][ T8646] handle_mm_fault+0x135d/0x1930 [ 32.217136][ T8646] do_user_addr_fault+0x393/0x810 [ 32.222130][ T8646] exc_page_fault+0xb8/0x330 [ 32.226708][ T8646] asm_exc_page_fault+0x1e/0x30 [ 32.231883][ T8646] [ 32.234186][ T8646] read to 0xffff88812aa4afa8 of 8 bytes by task 8646 on cpu 0: [ 32.241716][ T8646] __delayacct_blkio_end+0x70/0x100 [ 32.246895][ T8646] try_to_wake_up+0x109/0x4d0 [ 32.251540][ T8646] autoremove_wake_function+0xc/0x50 [ 32.256901][ T8646] wake_page_function+0xb5/0xe0 [ 32.261722][ T8646] __wake_up_common+0xbc/0x130 [ 32.266495][ T8646] wake_up_page_bit+0xa4/0x190 [ 32.271243][ T8646] unlock_page+0x5e/0x70 [ 32.275562][ T8646] do_read_fault+0x56b/0x730 [ 32.280208][ T8646] handle_mm_fault+0x135d/0x1930 [ 32.285116][ T8646] do_user_addr_fault+0x393/0x810 [ 32.290307][ T8646] exc_page_fault+0xb8/0x330 [ 32.294956][ T8646] asm_exc_page_fault+0x1e/0x30 [ 32.299770][ T8646] [ 32.302085][ T8646] Reported by Kernel Concurrency Sanitizer on: [ 32.308233][ T8646] CPU: 0 PID: 8646 Comm: syz-fuzzer Not tainted 5.8.0-rc3-syzkaller #0 [ 32.316445][ T8646] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 32.326925][ T8646] ================================================================== [ 32.334965][ T8646] Kernel panic - not syncing: panic_on_warn set ... [ 32.341525][ T8646] CPU: 0 PID: 8646 Comm: syz-fuzzer Not tainted 5.8.0-rc3-syzkaller #0 [ 32.350268][ T8646] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 32.360295][ T8646] Call Trace: [ 32.363573][ T8646] dump_stack+0x10f/0x19d [ 32.367877][ T8646] panic+0x207/0x64a [ 32.371745][ T8646] ? vprintk_emit+0x44a/0x4f0 [ 32.376402][ T8646] kcsan_report+0x684/0x690 [ 32.380996][ T8646] ? kcsan_setup_watchpoint+0x453/0x4d0 [ 32.386732][ T8646] ? __delayacct_blkio_end+0x70/0x100 [ 32.392085][ T8646] ? try_to_wake_up+0x109/0x4d0 [ 32.397432][ T8646] ? autoremove_wake_function+0xc/0x50 [ 32.403124][ T8646] ? wake_page_function+0xb5/0xe0 [ 32.408211][ T8646] ? __wake_up_common+0xbc/0x130 [ 32.413122][ T8646] ? wake_up_page_bit+0xa4/0x190 [ 32.419095][ T8646] ? unlock_page+0x5e/0x70 [ 32.423488][ T8646] ? do_read_fault+0x56b/0x730 [ 32.428221][ T8646] ? handle_mm_fault+0x135d/0x1930 [ 32.433302][ T8646] ? do_user_addr_fault+0x393/0x810 [ 32.438500][ T8646] ? exc_page_fault+0xb8/0x330 [ 32.443232][ T8646] ? asm_exc_page_fault+0x1e/0x30 [ 32.448509][ T8646] kcsan_setup_watchpoint+0x453/0x4d0 [ 32.453856][ T8646] __delayacct_blkio_end+0x70/0x100 [ 32.459211][ T8646] try_to_wake_up+0x109/0x4d0 [ 32.463860][ T8646] autoremove_wake_function+0xc/0x50 [ 32.469201][ T8646] wake_page_function+0xb5/0xe0 [ 32.474197][ T8646] __wake_up_common+0xbc/0x130 [ 32.478932][ T8646] wake_up_page_bit+0xa4/0x190 [ 32.483853][ T8646] unlock_page+0x5e/0x70 [ 32.488079][ T8646] do_read_fault+0x56b/0x730 [ 32.492657][ T8646] handle_mm_fault+0x135d/0x1930 [ 32.497568][ T8646] do_user_addr_fault+0x393/0x810 [ 32.502560][ T8646] exc_page_fault+0xb8/0x330 [ 32.507120][ T8646] ? asm_exc_page_fault+0x8/0x30 [ 32.512111][ T8646] asm_exc_page_fault+0x1e/0x30 [ 32.516944][ T8646] RIP: 0033:0x41f64a [ 32.520815][ T8646] Code: Bad RIP value. [ 32.524849][ T8646] RSP: 002b:00007ffcc81b6000 EFLAGS: 00010287 [ 32.530882][ T8646] RAX: 00007f7681177000 RBX: 0000000000000009 RCX: 0000000000040000 [ 32.539517][ T8646] RDX: 00000000013a06c0 RSI: 0000000000014960 RDI: 0000000000000004 [ 32.547544][ T8646] RBP: 00007ffcc81b6050 R08: 00000000013b5020 R09: 0000000000000026 [ 32.555672][ T8646] R10: 00000000016e6188 R11: 000000000000003a R12: 0000000000000003 [ 32.563622][ T8646] R13: 00000000016e5e00 R14: 000080c001452000 R15: 000080c002451fff [ 32.573348][ T8646] Kernel Offset: disabled [ 32.577786][ T8646] Rebooting in 86400 seconds..