Warning: Permanently added '10.128.0.64' (ECDSA) to the list of known hosts. executing program [ 52.042248] audit: type=1400 audit(1569241557.221:36): avc: denied { map } for pid=7755 comm="syz-executor108" path="/root/syz-executor108492831" dev="sda1" ino=16483 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:object_r:user_home_t:s0 tclass=file permissive=1 [ 52.060985] IPVS: ftp: loaded support on port[0] = 21 [ 52.254001] ================================================================== [ 52.262101] BUG: KASAN: use-after-free in pids_release+0x228/0x250 [ 52.268659] Read of size 8 at addr ffff8880a0af5248 by task syz-executor108/7755 [ 52.276217] [ 52.277837] CPU: 0 PID: 7755 Comm: syz-executor108 Not tainted 4.19.75 #0 [ 52.284764] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 52.294208] Call Trace: [ 52.296908] dump_stack+0x172/0x1f0 [ 52.300550] ? pids_release+0x228/0x250 [ 52.304786] print_address_description.cold+0x7c/0x20d [ 52.310068] ? pids_release+0x228/0x250 [ 52.314047] kasan_report.cold+0x8c/0x2ba [ 52.318967] __asan_report_load8_noabort+0x14/0x20 [ 52.323889] pids_release+0x228/0x250 [ 52.327679] cgroup_release+0x101/0x4a0 [ 52.331644] ? proc_tid_base_readdir+0x30/0x30 [ 52.336333] ? cgroup_exit+0x520/0x520 [ 52.340420] ? kasan_check_read+0x11/0x20 [ 52.344742] release_task+0x194/0x1630 [ 52.350120] ? _raw_spin_unlock_irq+0x28/0x90 [ 52.354617] ? lockdep_hardirqs_on+0x415/0x5d0 [ 52.359286] ? trace_hardirqs_on+0x67/0x220 [ 52.363609] wait_consider_task+0x2c95/0x3910 [ 52.368373] ? release_task+0x1630/0x1630 [ 52.372522] ? lock_acquire+0x16f/0x3f0 [ 52.376574] ? do_wait+0x3aa/0x9d0 [ 52.380140] ? kasan_check_write+0x14/0x20 [ 52.384365] do_wait+0x439/0x9d0 [ 52.387723] ? wait_consider_task+0x3910/0x3910 [ 52.392384] kernel_wait4+0x171/0x290 [ 52.396549] ? __ia32_sys_waitid+0x140/0x140 [ 52.400969] ? task_stopped_code+0x180/0x180 [ 52.405482] ? find_held_lock+0x35/0x130 [ 52.409703] ? __do_page_fault+0x676/0xe90 [ 52.414013] __do_sys_wait4+0x147/0x160 [ 52.417984] ? kernel_wait4+0x290/0x290 [ 52.422096] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 52.427930] ? up_read+0x1a/0x110 [ 52.431385] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 52.437153] ? __do_page_fault+0x484/0xe90 [ 52.441566] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 52.446674] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 52.451590] ? do_syscall_64+0x26/0x620 [ 52.455666] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 52.461246] ? do_syscall_64+0x26/0x620 [ 52.465313] __x64_sys_wait4+0x97/0xf0 [ 52.469206] do_syscall_64+0xfd/0x620 [ 52.473089] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 52.478608] RIP: 0033:0x4018aa [ 52.481981] Code: c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 8b 05 8e 92 2d 00 85 c0 75 36 45 31 d2 48 63 d2 48 63 ff b8 3d 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 06 c3 0f 1f 44 00 00 48 c7 c2 d0 ff ff ff f7 [ 52.501707] RSP: 002b:00007ffc1d858548 EFLAGS: 00000246 ORIG_RAX: 000000000000003d [ 52.510011] RAX: ffffffffffffffda RBX: 0000000000001e4c RCX: 00000000004018aa [ 52.517594] RDX: 0000000040000000 RSI: 00007ffc1d858554 RDI: ffffffffffffffff [ 52.524943] RBP: 00000000006d3018 R08: 0000000000000000 R09: 000055555589c880 [ 52.532471] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000402860 [ 52.539844] R13: 00000000004028f0 R14: 0000000000000000 R15: 0000000000000000 [ 52.547208] [ 52.548842] Allocated by task 7755: [ 52.552485] save_stack+0x45/0xd0 [ 52.555956] kasan_kmalloc+0xce/0xf0 [ 52.560212] kasan_slab_alloc+0xf/0x20 [ 52.564105] kmem_cache_alloc_node+0x144/0x710 [ 52.568687] copy_process.part.0+0x1ce0/0x7a30 [ 52.573280] _do_fork+0x257/0xfd0 [ 52.576728] __x64_sys_clone+0xbf/0x150 [ 52.580875] do_syscall_64+0xfd/0x620 [ 52.584677] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 52.589846] [ 52.591458] Freed by task 0: [ 52.594468] save_stack+0x45/0xd0 [ 52.598022] __kasan_slab_free+0x102/0x150 [ 52.602399] kasan_slab_free+0xe/0x10 [ 52.606190] kmem_cache_free+0x86/0x260 [ 52.610323] free_task+0xdd/0x120 [ 52.613851] __put_task_struct+0x20f/0x4c0 [ 52.618161] finish_task_switch+0x52b/0x780 [ 52.622571] __schedule+0x86e/0x1dc0 [ 52.626531] schedule_idle+0x58/0x80 [ 52.630246] do_idle+0x192/0x560 [ 52.633601] cpu_startup_entry+0xc8/0xe0 [ 52.637672] start_secondary+0x3e8/0x5b0 [ 52.641812] secondary_startup_64+0xa4/0xb0 [ 52.646240] [ 52.647959] The buggy address belongs to the object at ffff8880a0af4180 [ 52.647959] which belongs to the cache task_struct of size 6080 [ 52.660912] The buggy address is located 4296 bytes inside of [ 52.660912] 6080-byte region [ffff8880a0af4180, ffff8880a0af5940) [ 52.673418] The buggy address belongs to the page: [ 52.678601] page:ffffea000282bd00 count:1 mapcount:0 mapping:ffff88812c26d800 index:0x0 compound_mapcount: 0 [ 52.689280] flags: 0x1fffc0000008100(slab|head) [ 52.694103] raw: 01fffc0000008100 ffffea000282bc88 ffffea0002812188 ffff88812c26d800 [ 52.702229] raw: 0000000000000000 ffff8880a0af4180 0000000100000001 0000000000000000 [ 52.710256] page dumped because: kasan: bad access detected [ 52.716148] [ 52.717849] Memory state around the buggy address: [ 52.722863] ffff8880a0af5100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 52.731105] ffff8880a0af5180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 52.738811] >ffff8880a0af5200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 52.746375] ^ [ 52.752267] ffff8880a0af5280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 52.759726] ffff8880a0af5300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 52.767268] ================================================================== [ 52.774641] Disabling lock debugging due to kernel taint [ 52.780314] Kernel panic - not syncing: panic_on_warn set ... [ 52.780314] [ 52.787724] CPU: 0 PID: 7755 Comm: syz-executor108 Tainted: G B 4.19.75 #0 [ 52.796120] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 52.806138] Call Trace: [ 52.808941] dump_stack+0x172/0x1f0 [ 52.812565] ? pids_release+0x228/0x250 [ 52.816636] panic+0x263/0x507 [ 52.819906] ? __warn_printk+0xf3/0xf3 [ 52.823809] ? pids_release+0x228/0x250 [ 52.827863] ? preempt_schedule+0x4b/0x60 [ 52.832087] ? ___preempt_schedule+0x16/0x18 [ 52.836483] ? trace_hardirqs_on+0x5e/0x220 [ 52.840893] ? pids_release+0x228/0x250 [ 52.844872] kasan_end_report+0x47/0x4f [ 52.848849] kasan_report.cold+0xa9/0x2ba [ 52.853082] __asan_report_load8_noabort+0x14/0x20 [ 52.858089] pids_release+0x228/0x250 [ 52.862227] cgroup_release+0x101/0x4a0 [ 52.866273] ? proc_tid_base_readdir+0x30/0x30 [ 52.870839] ? cgroup_exit+0x520/0x520 [ 52.874722] ? kasan_check_read+0x11/0x20 [ 52.879031] release_task+0x194/0x1630 [ 52.882922] ? _raw_spin_unlock_irq+0x28/0x90 [ 52.887453] ? lockdep_hardirqs_on+0x415/0x5d0 [ 52.892209] ? trace_hardirqs_on+0x67/0x220 [ 52.896536] wait_consider_task+0x2c95/0x3910 [ 52.901319] ? release_task+0x1630/0x1630 [ 52.905523] ? lock_acquire+0x16f/0x3f0 [ 52.909706] ? do_wait+0x3aa/0x9d0 [ 52.913240] ? kasan_check_write+0x14/0x20 [ 52.917548] do_wait+0x439/0x9d0 [ 52.920902] ? wait_consider_task+0x3910/0x3910 [ 52.925577] kernel_wait4+0x171/0x290 [ 52.929538] ? __ia32_sys_waitid+0x140/0x140 [ 52.933986] ? task_stopped_code+0x180/0x180 [ 52.938847] ? find_held_lock+0x35/0x130 [ 52.943343] ? __do_page_fault+0x676/0xe90 [ 52.947664] __do_sys_wait4+0x147/0x160 [ 52.951722] ? kernel_wait4+0x290/0x290 [ 52.956322] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 52.962158] ? up_read+0x1a/0x110 [ 52.965703] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 52.971229] ? __do_page_fault+0x484/0xe90 [ 52.975454] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 52.980222] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 52.985120] ? do_syscall_64+0x26/0x620 [ 52.989082] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 52.994567] ? do_syscall_64+0x26/0x620 [ 52.998942] __x64_sys_wait4+0x97/0xf0 [ 53.002858] do_syscall_64+0xfd/0x620 [ 53.006658] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 53.011865] RIP: 0033:0x4018aa [ 53.015130] Code: c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 8b 05 8e 92 2d 00 85 c0 75 36 45 31 d2 48 63 d2 48 63 ff b8 3d 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 06 c3 0f 1f 44 00 00 48 c7 c2 d0 ff ff ff f7 [ 53.034020] RSP: 002b:00007ffc1d858548 EFLAGS: 00000246 ORIG_RAX: 000000000000003d [ 53.041805] RAX: ffffffffffffffda RBX: 0000000000001e4c RCX: 00000000004018aa [ 53.049149] RDX: 0000000040000000 RSI: 00007ffc1d858554 RDI: ffffffffffffffff [ 53.056493] RBP: 00000000006d3018 R08: 0000000000000000 R09: 000055555589c880 [ 53.063926] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000402860 [ 53.071336] R13: 00000000004028f0 R14: 0000000000000000 R15: 0000000000000000 [ 53.080804] Kernel Offset: disabled [ 53.084567] Rebooting in 86400 seconds..