Warning: Permanently added '[localhost]:7906' (ECDSA) to the list of known hosts. 2021/12/06 11:36:05 fuzzer started 2021/12/06 11:36:05 dialing manager at localhost:35719 2021/12/06 11:36:05 checking machine... 2021/12/06 11:36:05 checking revisions... syzkaller login: [ 37.002301] kmemleak: Automatic memory scanning thread ended 2021/12/06 11:36:05 testing simple program... [ 37.045956] cgroup: Unknown subsys name 'net' [ 37.047670] cgroup: Unknown subsys name 'net_prio' [ 37.048561] cgroup: Unknown subsys name 'devices' [ 37.051066] cgroup: Unknown subsys name 'blkio' [ 37.076296] [ 37.076568] ========================= [ 37.077006] WARNING: held lock freed! [ 37.077468] 5.16.0-rc3-next-20211203 #1 Not tainted [ 37.078050] ------------------------- [ 37.078528] kworker/1:3/83 is freeing memory ffff88800c69ec00-ffff88800c69edff, with a lock still held there! [ 37.079685] ffff88800c69ed48 (&root->kernfs_rwsem){++++}-{3:3}, at: __kernfs_remove+0x627/0xb00 [ 37.080737] 3 locks held by kworker/1:3/83: [ 37.081239] #0: ffff8880080a6138 ((wq_completion)cgroup_destroy){+.+.}-{0:0}, at: process_one_work+0x929/0x1710 [ 37.082476] #1: ffff88800f9ffda8 ((work_completion)(&(&css->destroy_rwork)->work)){+.+.}-{0:0}, at: process_one_work+0x95d/0x1710 [ 37.083867] #2: ffff88800c69ed48 (&root->kernfs_rwsem){++++}-{3:3}, at: __kernfs_remove+0x627/0xb00 [ 37.084967] [ 37.084967] stack backtrace: [ 37.085490] CPU: 1 PID: 83 Comm: kworker/1:3 Not tainted 5.16.0-rc3-next-20211203 #1 [ 37.088996] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.14.0-0-g155821a1990b-prebuilt.qemu.org 04/01/2014 [ 37.090541] Workqueue: cgroup_destroy css_free_rwork_fn [ 37.091181] Call Trace: [ 37.091500] [ 37.091767] dump_stack_lvl+0x8b/0xb3 [ 37.092223] debug_check_no_locks_freed.cold+0xa5/0xb1 [ 37.092845] ? kernfs_put.part.0+0x334/0x540 [ 37.093369] kfree+0xb3/0x5a0 [ 37.093744] ? kmem_cache_free+0xce/0x640 [ 37.094264] kernfs_put.part.0+0x334/0x540 [ 37.094785] kernfs_put+0x42/0x50 [ 37.095433] __kernfs_remove+0x7ce/0xb00 [ 37.096137] ? lock_is_held_type+0xd7/0x130 [ 37.096652] ? kernfs_next_descendant_post+0x2f0/0x2f0 [ 37.097271] ? down_write+0xde/0x150 [ 37.097711] ? down_write_killable_nested+0x180/0x180 [ 37.098344] kernfs_destroy_root+0x89/0xb0 [ 37.099170] css_free_rwork_fn+0xa28/0xf40 [ 37.099709] process_one_work+0xa30/0x1710 [ 37.100217] ? pwq_dec_nr_in_flight+0x2a0/0x2a0 [ 37.100765] ? rwlock_bug.part.0+0x90/0x90 [ 37.101268] ? _raw_spin_lock_irq+0x41/0x50 [ 37.101783] worker_thread+0x62a/0x13e0 [ 37.102281] ? process_one_work+0x1710/0x1710 [ 37.102812] kthread+0x40c/0x500 [ 37.103222] ? set_kthread_struct+0x130/0x130 [ 37.103754] ret_from_fork+0x22/0x30 [ 37.104205] [ 37.104659] ================================================================== [ 37.105510] BUG: KASAN: use-after-free in up_write+0x3ac/0x460 [ 37.106247] Read of size 8 at addr ffff88800c69ed40 by task kworker/1:3/83 [ 37.107054] [ 37.107252] CPU: 1 PID: 83 Comm: kworker/1:3 Not tainted 5.16.0-rc3-next-20211203 #1 [ 37.108164] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.14.0-0-g155821a1990b-prebuilt.qemu.org 04/01/2014 [ 37.109492] Workqueue: cgroup_destroy css_free_rwork_fn [ 37.110155] Call Trace: [ 37.110476] [ 37.110744] dump_stack_lvl+0x8b/0xb3 [ 37.111203] print_address_description.constprop.0+0x1f/0x180 [ 37.111890] ? up_write+0x3ac/0x460 [ 37.112319] ? up_write+0x3ac/0x460 [ 37.112735] kasan_report.cold+0x7f/0x11b [ 37.113204] ? up_write+0x3ac/0x460 [ 37.113606] up_write+0x3ac/0x460 [ 37.113995] css_free_rwork_fn+0xa28/0xf40 [ 37.114508] process_one_work+0xa30/0x1710 [ 37.114991] ? pwq_dec_nr_in_flight+0x2a0/0x2a0 [ 37.115509] ? rwlock_bug.part.0+0x90/0x90 [ 37.115985] ? _raw_spin_lock_irq+0x41/0x50 [ 37.116469] worker_thread+0x62a/0x13e0 [ 37.116918] ? process_one_work+0x1710/0x1710 [ 37.117424] kthread+0x40c/0x500 [ 37.117805] ? set_kthread_struct+0x130/0x130 [ 37.118354] ret_from_fork+0x22/0x30 [ 37.118781] [ 37.119036] [ 37.119218] Allocated by task 282: [ 37.119607] kasan_save_stack+0x1e/0x40 [ 37.120064] __kasan_kmalloc+0x81/0xa0 [ 37.120541] kernfs_create_root+0x4c/0x410 [ 37.121051] cgroup_setup_root+0x346/0xb60 [ 37.121571] cgroup1_get_tree+0xc1b/0x1370 [ 37.122070] vfs_get_tree+0x8e/0x2f0 [ 37.122544] path_mount+0x131b/0x1f80 [ 37.123024] __x64_sys_mount+0x27e/0x300 [ 37.123493] do_syscall_64+0x3b/0x90 [ 37.123970] entry_SYSCALL_64_after_hwframe+0x44/0xae [ 37.124591] [ 37.124771] Freed by task 83: [ 37.125103] kasan_save_stack+0x1e/0x40 [ 37.125612] kasan_set_track+0x21/0x30 [ 37.126031] kasan_set_free_info+0x20/0x30 [ 37.126555] __kasan_slab_free+0x108/0x170 [ 37.127010] kfree+0xc5/0x5a0 [ 37.127386] kernfs_put.part.0+0x334/0x540 [ 37.127842] kernfs_put+0x42/0x50 [ 37.128225] __kernfs_remove+0x7ce/0xb00 [ 37.128659] kernfs_destroy_root+0x89/0xb0 [ 37.129110] css_free_rwork_fn+0xa28/0xf40 [ 37.129650] process_one_work+0xa30/0x1710 [ 37.130106] worker_thread+0x62a/0x13e0 [ 37.130569] kthread+0x40c/0x500 [ 37.130931] ret_from_fork+0x22/0x30 [ 37.131528] [ 37.131821] The buggy address belongs to the object at ffff88800c69ec00 [ 37.131821] which belongs to the cache kmalloc-512 of size 512 [ 37.133928] The buggy address is located 320 bytes inside of [ 37.133928] 512-byte region [ffff88800c69ec00, ffff88800c69ee00) [ 37.135423] The buggy address belongs to the page: [ 37.136076] page:000000006562290d refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0xc69c [ 37.137056] head:000000006562290d order:2 compound_mapcount:0 compound_pincount:0 [ 37.137861] flags: 0x100000000010200(slab|head|node=0|zone=1) [ 37.138498] raw: 0100000000010200 0000000000000000 dead000000000001 ffff888007841c80 [ 37.139532] raw: 0000000000000000 0000000000100010 00000001ffffffff 0000000000000000 [ 37.140548] page dumped because: kasan: bad access detected [ 37.141288] [ 37.141506] Memory state around the buggy address: [ 37.142182] ffff88800c69ec00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 37.143133] ffff88800c69ec80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 37.144107] >ffff88800c69ed00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 37.145077] ^ [ 37.146290] ffff88800c69ed80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 37.148177] ffff88800c69ee00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 37.150415] ================================================================== [ 37.173030] cgroup: Unknown subsys name 'hugetlb' [ 37.174684] cgroup: Unknown subsys name 'rlimit' executing program executing program executing program VM DIAGNOSIS: 11:36:06 Registers: info registers vcpu 0 RAX=0000000000000000 RBX=ffff88806cf3d160 RCX=0000000000000000 RDX=ffff888018589ac0 RSI=ffffffff813865f9 RDI=0000000000000003 RBP=0000000000000003 RSP=ffff88801d7df930 R8 =0000000000000000 R9 =0000000000000001 R10=ffffffff8138661f R11=0000000000000000 R12=ffffed100d9e7a2d R13=0000000000000001 R14=ffff88806cf3d168 R15=0000000000000001 RIP=ffffffff813865fb RFL=00000293 [--S-A-C] CPL=0 II=0 A20=1 SMM=0 HLT=0 ES =0000 0000000000000000 00000000 00000000 CS =0010 0000000000000000 ffffffff 00a09b00 DPL=0 CS64 [-RA] SS =0018 0000000000000000 ffffffff 00c09300 DPL=0 DS [-WA] DS =0000 0000000000000000 00000000 00000000 FS =0000 000055555699d400 00000000 00000000 GS =0000 ffff88806ce00000 00000000 00000000 LDT=0000 fffffe0000000000 00000000 00000000 TR =0040 fffffe0000003000 00004087 00008b00 DPL=0 TSS64-busy GDT= fffffe0000001000 0000007f IDT= fffffe0000000000 00000fff CR0=80050033 CR2=00007ffd0dee5000 CR3=000000000de92000 CR4=00350ef0 DR0=0000000000000000 DR1=0000000000000000 DR2=0000000000000000 DR3=0000000000000000 DR6=00000000ffff0ff0 DR7=0000000000000400 EFER=0000000000000d01 FCW=037f FSW=0000 [ST=0] FTW=00 MXCSR=00001f80 FPR0=0000000000000000 0000 FPR1=0000000000000000 0000 FPR2=0000000000000000 0000 FPR3=0000000000000000 0000 FPR4=0000000000000000 0000 FPR5=0000000000000000 0000 FPR6=0000000000000000 0000 FPR7=0000000000000000 0000 YMM00=0000000000000000 0000000000000000 0000000000000000 0000000000000000 YMM01=0000000000000000 0000000000000000 0000000000000000 0000000000000000 YMM02=0000000000000000 0000000000000000 0000000000000000 0000000000000000 YMM03=0000000000000000 0000000000000000 0000000000000000 0000000000000000 YMM04=0000000000000000 0000000000000000 ffffffffffffffff ffffffffffffffff YMM05=0000000000000000 0000000000000000 0000000000000000 0000000000000000 YMM06=0000000000000000 0000000000000000 0000000000000000 0000000000000000 YMM07=0000000000000000 0000000000000000 0000000000000000 0000000000000000 YMM08=0000000000000000 0000000000000000 0000000000000000 0000000000000000 YMM09=0000000000000000 0000000000000000 0000000000000000 0000000000000000 YMM10=0000000000000000 0000000000000000 0000000000000000 0000000000000000 YMM11=0000000000000000 0000000000000000 0000000000000000 0000000000000000 YMM12=0000000000000000 0000000000000000 0000000000000000 0000000000000000 YMM13=0000000000000000 0000000000000000 0000000000000000 0000000000000000 YMM14=0000000000000000 0000000000000000 0000000000000000 0000000000000000 YMM15=0000000000000000 0000000000000000 0000000000000000 0000000000000000 info registers vcpu 1 RAX=000000000000000a RBX=00000000000003f8 RCX=0000000000000000 RDX=00000000000003f8 RSI=ffffffff823640e1 RDI=ffffffff87381a60 RBP=ffffffff87381a20 RSP=ffff88800f9ff538 R8 =0000000000000000 R9 =000000000000000a R10=ffffffff82365d23 R11=000000000000000a R12=000000000000000a R13=000000000000000a R14=ffffffff87381a20 R15=dffffc0000000000 RIP=ffffffff82364138 RFL=00000002 [-------] CPL=0 II=0 A20=1 SMM=0 HLT=0 ES =0000 0000000000000000 00000000 00000000 CS =0010 0000000000000000 ffffffff 00a09b00 DPL=0 CS64 [-RA] SS =0018 0000000000000000 ffffffff 00c09300 DPL=0 DS [-WA] DS =0000 0000000000000000 00000000 00000000 FS =0000 0000000000000000 00000000 00000000 GS =0000 ffff88806cf00000 00000000 00000000 LDT=0000 fffffe0000000000 00000000 00000000 TR =0040 fffffe000004a000 00004087 00008b00 DPL=0 TSS64-busy GDT= fffffe0000048000 0000007f IDT= fffffe0000000000 00000fff CR0=80050033 CR2=00007fb9c7368bd0 CR3=000000000dd02000 CR4=00350ee0 DR0=0000000000000000 DR1=0000000000000000 DR2=0000000000000000 DR3=0000000000000000 DR6=00000000ffff0ff0 DR7=0000000000000400 EFER=0000000000000d01 FCW=037f FSW=0000 [ST=0] FTW=00 MXCSR=00001f80 FPR0=0000000000000000 0000 FPR1=0000000000000000 0000 FPR2=0000000000000000 0000 FPR3=0000000000000000 0000 FPR4=0000000000000000 0000 FPR5=0000000000000000 0000 FPR6=0000000000000000 0000 FPR7=0000000000000000 0000 YMM00=0000000000000000 0000000000000000 0000000000000000 0000000000000000 YMM01=0000000000000000 0000000000000000 6df45e31371b169b 2f4027b3178a9ac7 YMM02=0000000000000000 0000000000000000 1210b8ba71c28343 0000000000115a78 YMM03=0000000000000000 0000000000000000 b8124cb51b78fb2a 000000000012bf38 YMM04=0000000000000000 0000000000000000 83e31184addc9442 00000000000ae980 YMM05=0000000000000000 0000000000000000 9ebfcf3a7e7141ea 000000000012bfa8 YMM06=0000000000000000 0000000000000000 698e0f81b0932b79 000000000012bee0 YMM07=0000000000000000 0000000000000000 e45775b7bd281a64 0000000000115a18 YMM08=0000000000000000 0000000000000000 e2de77aa903facfa 0000000000115968 YMM09=0000000000000000 0000000000000000 0000000000000000 0000000000000000 YMM10=0000000000000000 0000000000000000 2020000000002020 2020202020200000 YMM11=0000000000000000 0000000000000000 0000000000000000 0000000000000000 YMM12=0000000000000000 0000000000000000 0000000000000000 0000000000000000 YMM13=0000000000000000 0000000000000000 0000000000000000 0000000000000000 YMM14=0000000000000000 0000000000000000 0000000000000000 0000000000000000 YMM15=0000000000000000 0000000000000000 0000000000000000 0000000000000000