[ 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 '10.128.0.157' (ECDSA) to the list of known hosts. 2020/06/16 12:46:34 fuzzer started 2020/06/16 12:46:34 dialing manager at 10.128.0.105:37643 2020/06/16 12:46:43 syscalls: 3085 2020/06/16 12:46:43 code coverage: enabled 2020/06/16 12:46:43 comparison tracing: enabled 2020/06/16 12:46:43 extra coverage: enabled 2020/06/16 12:46:43 setuid sandbox: enabled 2020/06/16 12:46:43 namespace sandbox: enabled 2020/06/16 12:46:43 Android sandbox: /sys/fs/selinux/policy does not exist 2020/06/16 12:46:43 fault injection: enabled 2020/06/16 12:46:43 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2020/06/16 12:46:43 net packet injection: enabled 2020/06/16 12:46:43 net device setup: enabled 2020/06/16 12:46:43 concurrency sanitizer: enabled 2020/06/16 12:46:43 devlink PCI setup: PCI device 0000:00:10.0 is not available 2020/06/16 12:46:43 USB emulation: enabled syzkaller login: [ 57.972472][ T8918] KCSAN: could not find function: '_find_next_bit' [ 58.951525][ T8918] KCSAN: could not find function: 'poll_schedule_timeout' 2020/06/16 12:46:47 suppressing KCSAN reports in functions: 'blk_mq_get_request' 'mod_timer' 'generic_file_read_iter' '_find_next_bit' 'page_counter_charge' 'copy_process' 'blk_mq_dispatch_rq_list' 'ext4_free_inodes_count' 'do_syslog' 'poll_schedule_timeout' 'xas_clear_mark' 'ep_poll' 'complete_signal' 'generic_write_end' 'futex_wait_queue_me' 'pcpu_alloc' 'alloc_pid' '__send_signal' 'atime_needs_update' 'commit_echoes' 'generic_fillattr' '__ext4_new_inode' 'blk_mq_sched_dispatch_requests' 'do_nanosleep' 'find_get_pages_range_tag' 'decrypt_packet' 'run_timer_softirq' 'fasync_remove_entry' 'io_sq_thread' 'file_update_time' 'kauditd_thread' [ 97.359777][ C1] ================================================================== [ 97.368781][ C1] BUG: KCSAN: data-race in tick_sched_do_timer / tick_sched_do_timer [ 97.376916][ C1] [ 97.379224][ C1] write to 0xffffffff8764e210 of 4 bytes by interrupt on cpu 0: [ 97.386841][ C1] tick_sched_do_timer+0xb4/0xd0 [ 97.391865][ C1] tick_sched_timer+0x3f/0xd0 [ 97.396818][ C1] __hrtimer_run_queues+0x271/0x600 [ 97.402013][ C1] hrtimer_interrupt+0x226/0x490 [ 97.406928][ C1] smp_apic_timer_interrupt+0xd8/0x270 [ 97.414880][ C1] apic_timer_interrupt+0xf/0x20 [ 97.419795][ C1] native_safe_halt+0xe/0x10 [ 97.424359][ C1] default_idle+0x21/0x170 [ 97.428759][ C1] do_idle+0x1b7/0x290 [ 97.433592][ C1] cpu_startup_entry+0x14/0x20 [ 97.438342][ C1] rest_init+0xe4/0xeb [ 97.442485][ C1] arch_call_rest_init+0x13/0x2b [ 97.447519][ C1] start_kernel+0x7fe/0x823 [ 97.452001][ C1] secondary_startup_64+0xa4/0xb0 [ 97.457358][ C1] [ 97.459684][ C1] read to 0xffffffff8764e210 of 4 bytes by interrupt on cpu 1: [ 97.467233][ C1] tick_sched_do_timer+0x2e/0xd0 [ 97.472214][ C1] tick_sched_timer+0x3f/0xd0 [ 97.477031][ C1] __hrtimer_run_queues+0x271/0x600 [ 97.482217][ C1] hrtimer_interrupt+0x226/0x490 [ 97.487139][ C1] smp_apic_timer_interrupt+0xd8/0x270 [ 97.492586][ C1] apic_timer_interrupt+0xf/0x20 [ 97.497509][ C1] tcp_recvmsg+0x0/0x1ba0 [ 97.501845][ C1] inet_recvmsg+0xc1/0x250 [ 97.506241][ C1] sock_recvmsg+0x8e/0xb0 [ 97.510558][ C1] sock_read_iter+0x185/0x230 [ 97.516007][ C1] new_sync_read+0x416/0x450 [ 97.520591][ C1] __vfs_read+0x9e/0xb0 [ 97.525070][ C1] vfs_read+0x13e/0x2b0 [ 97.529209][ C1] ksys_read+0x16a/0x1a0 [ 97.533437][ C1] __x64_sys_read+0x49/0x60 [ 97.537920][ C1] do_syscall_64+0xc7/0x3b0 [ 97.542413][ C1] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 97.549077][ C1] [ 97.551388][ C1] Reported by Kernel Concurrency Sanitizer on: [ 97.557529][ C1] CPU: 1 PID: 8904 Comm: syz-fuzzer Not tainted 5.7.0-rc1-syzkaller #0 [ 97.565914][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 97.577681][ C1] ================================================================== [ 97.585816][ C1] Kernel panic - not syncing: panic_on_warn set ... [ 97.592833][ C1] CPU: 1 PID: 8904 Comm: syz-fuzzer Not tainted 5.7.0-rc1-syzkaller #0 [ 97.601054][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 97.611091][ C1] Call Trace: [ 97.614350][ C1] [ 97.617187][ C1] dump_stack+0x11d/0x187 [ 97.621526][ C1] panic+0x210/0x640 [ 97.625411][ C1] ? vprintk_func+0x89/0x13a [ 97.629979][ C1] kcsan_report.cold+0xc/0x1a [ 97.634637][ C1] kcsan_setup_watchpoint+0x3fb/0x440 [ 97.640001][ C1] tick_sched_do_timer+0x2e/0xd0 [ 97.645784][ C1] tick_sched_timer+0x3f/0xd0 [ 97.650438][ C1] __hrtimer_run_queues+0x271/0x600 [ 97.655614][ C1] ? tick_sched_do_timer+0xd0/0xd0 [ 97.660719][ C1] hrtimer_interrupt+0x226/0x490 [ 97.665655][ C1] ? kvm_clock_read+0x14/0x30 [ 97.670325][ C1] smp_apic_timer_interrupt+0xd8/0x270 [ 97.675772][ C1] apic_timer_interrupt+0xf/0x20 [ 97.680677][ C1] [ 97.684056][ C1] RIP: 0010:tcp_recvmsg+0x0/0x1ba0 [ 97.689756][ C1] Code: 78 05 00 00 89 04 24 e9 7a ff ff ff 41 bc ea ff ff ff e9 da fc ff ff e8 de 4e 10 fc 0f 1f 40 00 66 2e 0f 1f 84 00 00 00 00 00 <55> 48 89 e5 41 57 49 89 ff 41 56 41 55 4d 89 cd 41 54 41 89 cc 53 [ 97.709624][ C1] RSP: 0018:ffffc90000db3c60 EFLAGS: 00000202 ORIG_RAX: ffffffffffffff13 [ 97.718013][ C1] RAX: ffff888128d77a18 RBX: 0000000000000000 RCX: 0000000000000040 [ 97.726130][ C1] RDX: 0000000000001000 RSI: ffffc90000db3cf8 RDI: ffff888121fbf300 [ 97.734218][ C1] RBP: ffffc90000db3cf8 R08: 0000000000000000 R09: ffffc90000db3c7c [ 97.742345][ C1] R10: 0000c90000db3c7c R11: 0000ffff875783c7 R12: ffff888121fbf300 [ 97.750562][ C1] R13: 0000000000001000 R14: ffffffff87578340 R15: ffffc90000db3d18 [ 97.758552][ C1] inet_recvmsg+0xc1/0x250 [ 97.762949][ C1] ? apparmor_socket_recvmsg+0x38/0x40 [ 97.768394][ C1] ? inet_sendpage+0xf0/0xf0 [ 97.772974][ C1] sock_recvmsg+0x8e/0xb0 [ 97.777284][ C1] sock_read_iter+0x185/0x230 [ 97.781952][ C1] new_sync_read+0x416/0x450 [ 97.786783][ C1] __vfs_read+0x9e/0xb0 [ 97.790953][ C1] vfs_read+0x13e/0x2b0 [ 97.795381][ C1] ksys_read+0x16a/0x1a0 [ 97.800053][ C1] __x64_sys_read+0x49/0x60 [ 97.804646][ C1] do_syscall_64+0xc7/0x3b0 [ 97.809128][ C1] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 97.815013][ C1] RIP: 0033:0x4b3cdb [ 97.818894][ C1] Code: ff e9 69 ff ff ff cc cc cc cc cc cc cc cc cc e8 bb a1 f8 ff 48 8b 7c 24 10 48 8b 74 24 18 48 8b 54 24 20 48 8b 44 24 08 0f 05 <48> 3d 01 f0 ff ff 76 20 48 c7 44 24 28 ff ff ff ff 48 c7 44 24 30 [ 97.838648][ C1] RSP: 002b:000000c000275890 EFLAGS: 00000206 ORIG_RAX: 0000000000000000 [ 97.848348][ C1] RAX: ffffffffffffffda RBX: 000000c00002c000 RCX: 00000000004b3cdb [ 97.856321][ C1] RDX: 0000000000001000 RSI: 000000c0003ea000 RDI: 0000000000000006 [ 97.864924][ C1] RBP: 000000c0002758e0 R08: 0000000000000001 R09: 0000000000000002 [ 97.874544][ C1] R10: 00000000000011cd R11: 0000000000000206 R12: 0000000000005238 [ 97.882530][ C1] R13: 0000000000002000 R14: 0000000000000008 R15: 0000000000000004 [ 97.892237][ C1] Kernel Offset: disabled [ 97.896653][ C1] Rebooting in 86400 seconds..