Warning: Permanently added '[localhost]:51434' (ECDSA) to the list of known hosts. 2021/12/06 11:39:53 fuzzer started 2021/12/06 11:39:53 dialing manager at localhost:35719 2021/12/06 11:39:53 checking machine... 2021/12/06 11:39:53 checking revisions... syzkaller login: [ 32.956301] kmemleak: Automatic memory scanning thread ended 2021/12/06 11:39:53 testing simple program... [ 32.993705] cgroup: Unknown subsys name 'net' [ 32.995351] cgroup: Unknown subsys name 'net_prio' [ 32.998278] cgroup: Unknown subsys name 'devices' [ 33.000394] cgroup: Unknown subsys name 'blkio' [ 33.033819] [ 33.034221] ========================= [ 33.035036] WARNING: held lock freed! [ 33.035834] 5.16.0-rc3-next-20211203 #1 Not tainted [ 33.037226] ------------------------- [ 33.038932] kworker/0:1/10 is freeing memory ffff88800cb24c00-ffff88800cb24dff, with a lock still held there! [ 33.041376] ffff88800cb24d48 (&root->kernfs_rwsem){++++}-{3:3}, at: __kernfs_remove+0x627/0xb00 [ 33.043258] 3 locks held by kworker/0:1/10: [ 33.044136] #0: ffff8880080a6138 ((wq_completion)cgroup_destroy){+.+.}-{0:0}, at: process_one_work+0x929/0x1710 [ 33.046290] #1: ffff888008197da8 ((work_completion)(&(&css->destroy_rwork)->work)){+.+.}-{0:0}, at: process_one_work+0x95d/0x1710 [ 33.048724] #2: ffff88800cb24d48 (&root->kernfs_rwsem){++++}-{3:3}, at: __kernfs_remove+0x627/0xb00 [ 33.050648] [ 33.050648] stack backtrace: [ 33.051562] CPU: 0 PID: 10 Comm: kworker/0:1 Not tainted 5.16.0-rc3-next-20211203 #1 [ 33.053182] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.14.0-0-g155821a1990b-prebuilt.qemu.org 04/01/2014 [ 33.055557] Workqueue: cgroup_destroy css_free_rwork_fn [ 33.056671] Call Trace: [ 33.057202] [ 33.057673] dump_stack_lvl+0x8b/0xb3 [ 33.058464] debug_check_no_locks_freed.cold+0xa5/0xb1 [ 33.059558] ? kernfs_put.part.0+0x334/0x540 [ 33.060490] kfree+0xb3/0x5a0 [ 33.061143] ? kmem_cache_free+0xce/0x640 [ 33.062028] kernfs_put.part.0+0x334/0x540 [ 33.062928] kernfs_put+0x42/0x50 [ 33.063655] __kernfs_remove+0x7ce/0xb00 [ 33.064502] ? lock_is_held_type+0xd7/0x130 [ 33.065401] ? kernfs_next_descendant_post+0x2f0/0x2f0 [ 33.066532] ? down_write+0xde/0x150 [ 33.067323] ? down_write_killable_nested+0x180/0x180 [ 33.068396] kernfs_destroy_root+0x89/0xb0 [ 33.069266] css_free_rwork_fn+0xa28/0xf40 [ 33.070166] process_one_work+0xa30/0x1710 [ 33.071042] ? pwq_dec_nr_in_flight+0x2a0/0x2a0 [ 33.072001] ? rwlock_bug.part.0+0x90/0x90 [ 33.072871] ? _raw_spin_lock_irq+0x41/0x50 [ 33.073770] worker_thread+0x62a/0x13e0 [ 33.074595] ? process_one_work+0x1710/0x1710 [ 33.075525] kthread+0x40c/0x500 [ 33.076233] ? set_kthread_struct+0x130/0x130 [ 33.077171] ret_from_fork+0x22/0x30 [ 33.077967] [ 33.078546] ================================================================== [ 33.080044] BUG: KASAN: use-after-free in up_write+0x3ac/0x460 [ 33.081270] Read of size 8 at addr ffff88800cb24d40 by task kworker/0:1/10 [ 33.082725] [ 33.083063] CPU: 0 PID: 10 Comm: kworker/0:1 Not tainted 5.16.0-rc3-next-20211203 #1 [ 33.084669] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.14.0-0-g155821a1990b-prebuilt.qemu.org 04/01/2014 [ 33.087011] Workqueue: cgroup_destroy css_free_rwork_fn [ 33.088114] Call Trace: [ 33.088638] [ 33.089094] dump_stack_lvl+0x8b/0xb3 [ 33.089919] print_address_description.constprop.0+0x1f/0x180 [ 33.091127] ? up_write+0x3ac/0x460 [ 33.091873] ? up_write+0x3ac/0x460 [ 33.092631] kasan_report.cold+0x7f/0x11b [ 33.093514] ? up_write+0x3ac/0x460 [ 33.094270] up_write+0x3ac/0x460 [ 33.094995] css_free_rwork_fn+0xa28/0xf40 [ 33.095882] process_one_work+0xa30/0x1710 [ 33.096767] ? pwq_dec_nr_in_flight+0x2a0/0x2a0 [ 33.097749] ? rwlock_bug.part.0+0x90/0x90 [ 33.098627] ? _raw_spin_lock_irq+0x41/0x50 [ 33.099526] worker_thread+0x62a/0x13e0 [ 33.100365] ? process_one_work+0x1710/0x1710 [ 33.101302] kthread+0x40c/0x500 [ 33.102012] ? set_kthread_struct+0x130/0x130 [ 33.102950] ret_from_fork+0x22/0x30 [ 33.103730] [ 33.104210] [ 33.104546] Allocated by task 283: [ 33.105272] kasan_save_stack+0x1e/0x40 [ 33.106118] __kasan_kmalloc+0x81/0xa0 [ 33.106927] kernfs_create_root+0x4c/0x410 [ 33.107803] cgroup_setup_root+0x346/0xb60 [ 33.108696] cgroup1_get_tree+0xc1b/0x1370 [ 33.109588] vfs_get_tree+0x8e/0x2f0 [ 33.110365] path_mount+0x131b/0x1f80 [ 33.111158] __x64_sys_mount+0x27e/0x300 [ 33.111997] do_syscall_64+0x3b/0x90 [ 33.112770] entry_SYSCALL_64_after_hwframe+0x44/0xae [ 33.113861] [ 33.114191] Freed by task 10: [ 33.114829] kasan_save_stack+0x1e/0x40 [ 33.115657] kasan_set_track+0x21/0x30 [ 33.116460] kasan_set_free_info+0x20/0x30 [ 33.117350] __kasan_slab_free+0x108/0x170 [ 33.118239] kfree+0xc5/0x5a0 [ 33.118888] kernfs_put.part.0+0x334/0x540 [ 33.119768] kernfs_put+0x42/0x50 [ 33.120484] __kernfs_remove+0x7ce/0xb00 [ 33.121326] kernfs_destroy_root+0x89/0xb0 [ 33.122220] css_free_rwork_fn+0xa28/0xf40 [ 33.123097] process_one_work+0xa30/0x1710 [ 33.123973] worker_thread+0x62a/0x13e0 [ 33.124803] kthread+0x40c/0x500 [ 33.125517] ret_from_fork+0x22/0x30 [ 33.126288] [ 33.126619] The buggy address belongs to the object at ffff88800cb24c00 [ 33.126619] which belongs to the cache kmalloc-512 of size 512 [ 33.129165] The buggy address is located 320 bytes inside of [ 33.129165] 512-byte region [ffff88800cb24c00, ffff88800cb24e00) [ 33.131608] The buggy address belongs to the page: [ 33.132622] page:000000009a868e4b refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0xcb24 [ 33.134549] head:000000009a868e4b order:2 compound_mapcount:0 compound_pincount:0 [ 33.136113] flags: 0x100000000010200(slab|head|node=0|zone=1) [ 33.137336] raw: 0100000000010200 dead000000000100 dead000000000122 ffff888007841c80 [ 33.138974] raw: 0000000000000000 0000000000100010 00000001ffffffff 0000000000000000 [ 33.140579] page dumped because: kasan: bad access detected [ 33.141749] [ 33.142084] Memory state around the buggy address: [ 33.143086] ffff88800cb24c00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 33.144582] ffff88800cb24c80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 33.146088] >ffff88800cb24d00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 33.147580] ^ [ 33.148691] ffff88800cb24d80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 33.150203] ffff88800cb24e00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 33.151701] ================================================================== [ 33.200841] cgroup: Unknown subsys name 'hugetlb' [ 33.202074] cgroup: Unknown subsys name 'rlimit' executing program executing program executing program VM DIAGNOSIS: 11:39:54 Registers: info registers vcpu 0 RAX=0000000000000033 RBX=00000000000003f8 RCX=0000000000000000 RDX=00000000000003f8 RSI=ffffffff823640e1 RDI=ffffffff87381a60 RBP=ffffffff87381a20 RSP=ffff888008197648 R8 =0000000000000000 R9 =0000000000000033 R10=ffffffff82365d23 R11=000000000000000a R12=0000000000000033 R13=0000000000000033 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 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=00007f5726872e10 CR3=000000000cbac000 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=00001fa0 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 3f847ae147ae147b YMM02=0000000000000000 0000000000000000 0000000000000000 0000000000000000 YMM03=0000000000000000 0000000000000000 0000000000000000 3f73ff356be127e4 YMM04=0000000000000000 0000000000000000 00007ff5d2b5d500 0000000000415710 YMM05=0000000000000000 0000000000000000 0000000000000000 000000c0001fa978 YMM06=0000000000000000 0000000000000000 0000000000505007 000000c000028fc0 YMM07=0000000000000000 0000000000000000 0000000000000000 0000000000000000 YMM08=0000000000000000 0000000000000000 0000000000000000 0000000000000000 YMM09=0000000000000000 0000000000000000 00000000004643c1 0000000000000000 YMM10=0000000000000000 0000000000000000 000000c00009c380 000000c0001b02c0 YMM11=0000000000000000 0000000000000000 0000000000000000 0000000000000000 YMM12=0000000000000000 0000000000000000 0000000000000000 0000000000000000 YMM13=0000000000000000 0000000000000000 7246656361526174 61440e010096ff01 YMM14=0000000000000000 0000000000000000 467265766f431101 0096ff0173656d61 YMM15=0000000000000000 0000000000000000 0000000a0170616d 7469427265746c69 info registers vcpu 1 RAX=ffffffff84078af0 RBX=ffff8880081a9ac0 RCX=ffffffff8405abe1 RDX=ffffed100d9e7143 RSI=0000000000000001 RDI=ffffffff84078eaf RBP=0000000000000001 RSP=ffff888008207e78 R8 =0000000000000000 R9 =ffff88806cf38a13 R10=ffffed100d9e7142 R11=0000000000000001 R12=ffffed1001035358 R13=ffffffff858bd8d0 R14=0000000000000000 R15=dffffc0000000000 RIP=ffffffff84078afb RFL=00000246 [---Z-P-] CPL=0 II=0 A20=1 SMM=0 HLT=1 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=00007ffc71df0000 CR3=000000000cbac000 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=00001fa0 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 3f847ae147ae147b YMM02=0000000000000000 0000000000000000 0000000000000000 0000000000000000 YMM03=0000000000000000 0000000000000000 0000000000000000 3f727849bcee1af6 YMM04=0000000000000000 0000000000000000 00007ff5d2b78f00 0000000000415710 YMM05=0000000000000000 0000000000000000 0000000000b12758 000000c0000c0410 YMM06=0000000000000000 0000000000000000 0000000000505007 000000c0000297c0 YMM07=0000000000000000 0000000000000000 0000000000000000 0000000000000000 YMM08=0000000000000000 0000000000000000 00000000004643c6 0000000000000000 YMM09=0000000000000000 0000000000000000 00000000004643c1 0000000000000000 YMM10=0000000000000000 0000000000000000 000000c00009d760 000000c000156c60 YMM11=0000000000000000 0000000000000000 0000000000000000 0000000000000000 YMM12=0000000000000000 0000000000000000 0000000000000000 0000000000000000 YMM13=0000000000000000 0000000000000000 000000c0000875f0 000000c000146c90 YMM14=0000000000000000 0000000000000000 000000c000146cf0 000000c000146cc0 YMM15=0000000000000000 0000000000000000 000000c000146d50 000000c000146d20