Warning: Permanently added '[localhost]:13479' (ECDSA) to the list of known hosts. 2021/12/06 11:39:22 fuzzer started 2021/12/06 11:39:22 dialing manager at localhost:35719 2021/12/06 11:39:22 checking machine... 2021/12/06 11:39:22 checking revisions... syzkaller login: [ 35.184849] kmemleak: Automatic memory scanning thread ended 2021/12/06 11:39:23 testing simple program... [ 35.232515] cgroup: Unknown subsys name 'net' [ 35.234627] cgroup: Unknown subsys name 'net_prio' [ 35.236613] cgroup: Unknown subsys name 'devices' [ 35.238476] cgroup: Unknown subsys name 'blkio' [ 35.262694] [ 35.263098] ========================= [ 35.263879] WARNING: held lock freed! [ 35.264669] 5.16.0-rc3-next-20211203 #1 Not tainted [ 35.265829] ------------------------- [ 35.266959] kworker/1:1/31 is freeing memory ffff88800cb1c400-ffff88800cb1c5ff, with a lock still held there! [ 35.269300] ffff88800cb1c548 (&root->kernfs_rwsem){++++}-{3:3}, at: __kernfs_remove+0x627/0xb00 [ 35.271156] 3 locks held by kworker/1:1/31: [ 35.272047] #0: ffff8880080a6138 ((wq_completion)cgroup_destroy){+.+.}-{0:0}, at: process_one_work+0x929/0x1710 [ 35.274209] #1: ffff888009aa7da8 ((work_completion)(&(&css->destroy_rwork)->work)){+.+.}-{0:0}, at: process_one_work+0x95d/0x1710 [ 35.276700] #2: ffff88800cb1c548 (&root->kernfs_rwsem){++++}-{3:3}, at: __kernfs_remove+0x627/0xb00 [ 35.278637] [ 35.278637] stack backtrace: [ 35.279565] CPU: 1 PID: 31 Comm: kworker/1:1 Not tainted 5.16.0-rc3-next-20211203 #1 [ 35.281191] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.14.0-0-g155821a1990b-prebuilt.qemu.org 04/01/2014 [ 35.283561] Workqueue: cgroup_destroy css_free_rwork_fn [ 35.284693] Call Trace: [ 35.285227] [ 35.285691] dump_stack_lvl+0x8b/0xb3 [ 35.286489] debug_check_no_locks_freed.cold+0xa5/0xb1 [ 35.287592] ? kernfs_put.part.0+0x334/0x540 [ 35.288523] kfree+0xb3/0x5a0 [ 35.289176] ? kmem_cache_free+0xce/0x640 [ 35.290049] kernfs_put.part.0+0x334/0x540 [ 35.290945] kernfs_put+0x42/0x50 [ 35.291666] __kernfs_remove+0x7ce/0xb00 [ 35.292526] ? lock_is_held_type+0xd7/0x130 [ 35.293432] ? kernfs_next_descendant_post+0x2f0/0x2f0 [ 35.294531] ? down_write+0xde/0x150 [ 35.295304] ? down_write_killable_nested+0x180/0x180 [ 35.296429] kernfs_destroy_root+0x89/0xb0 [ 35.297304] css_free_rwork_fn+0xa28/0xf40 [ 35.298188] process_one_work+0xa30/0x1710 [ 35.299055] ? pwq_dec_nr_in_flight+0x2a0/0x2a0 [ 35.300004] ? rwlock_bug.part.0+0x90/0x90 [ 35.300887] ? _raw_spin_lock_irq+0x41/0x50 [ 35.301765] worker_thread+0x62a/0x13e0 [ 35.302575] ? process_one_work+0x1710/0x1710 [ 35.303488] kthread+0x40c/0x500 [ 35.304180] ? set_kthread_struct+0x130/0x130 [ 35.305117] ret_from_fork+0x22/0x30 [ 35.305887] [ 35.306435] ================================================================== [ 35.307897] BUG: KASAN: use-after-free in up_write+0x3ac/0x460 [ 35.309104] Read of size 8 at addr ffff88800cb1c540 by task kworker/1:1/31 [ 35.310506] [ 35.310832] CPU: 1 PID: 31 Comm: kworker/1:1 Not tainted 5.16.0-rc3-next-20211203 #1 [ 35.312420] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.14.0-0-g155821a1990b-prebuilt.qemu.org 04/01/2014 [ 35.314720] Workqueue: cgroup_destroy css_free_rwork_fn [ 35.315812] Call Trace: [ 35.316333] [ 35.316798] dump_stack_lvl+0x8b/0xb3 [ 35.317583] print_address_description.constprop.0+0x1f/0x180 [ 35.318764] ? up_write+0x3ac/0x460 [ 35.319498] ? up_write+0x3ac/0x460 [ 35.320233] kasan_report.cold+0x7f/0x11b [ 35.321085] ? up_write+0x3ac/0x460 [ 35.321816] up_write+0x3ac/0x460 [ 35.322518] css_free_rwork_fn+0xa28/0xf40 [ 35.323381] process_one_work+0xa30/0x1710 [ 35.324242] ? pwq_dec_nr_in_flight+0x2a0/0x2a0 [ 35.325205] ? rwlock_bug.part.0+0x90/0x90 [ 35.326067] ? _raw_spin_lock_irq+0x41/0x50 [ 35.326942] worker_thread+0x62a/0x13e0 [ 35.327747] ? process_one_work+0x1710/0x1710 [ 35.328668] kthread+0x40c/0x500 [ 35.329372] ? set_kthread_struct+0x130/0x130 [ 35.330315] ret_from_fork+0x22/0x30 [ 35.331102] [ 35.331585] [ 35.331927] Allocated by task 281: [ 35.332666] kasan_save_stack+0x1e/0x40 [ 35.333499] __kasan_kmalloc+0x81/0xa0 [ 35.334314] kernfs_create_root+0x4c/0x410 [ 35.335193] cgroup_setup_root+0x346/0xb60 [ 35.336074] cgroup1_get_tree+0xc1b/0x1370 [ 35.336961] vfs_get_tree+0x8e/0x2f0 [ 35.337730] path_mount+0x131b/0x1f80 [ 35.338517] __x64_sys_mount+0x27e/0x300 [ 35.339359] do_syscall_64+0x3b/0x90 [ 35.340126] entry_SYSCALL_64_after_hwframe+0x44/0xae [ 35.341225] [ 35.341564] Freed by task 31: [ 35.342204] kasan_save_stack+0x1e/0x40 [ 35.343031] kasan_set_track+0x21/0x30 [ 35.343843] kasan_set_free_info+0x20/0x30 [ 35.344735] __kasan_slab_free+0x108/0x170 [ 35.345618] kfree+0xc5/0x5a0 [ 35.346269] kernfs_put.part.0+0x334/0x540 [ 35.347153] kernfs_put+0x42/0x50 [ 35.347876] __kernfs_remove+0x7ce/0xb00 [ 35.348732] kernfs_destroy_root+0x89/0xb0 [ 35.349621] css_free_rwork_fn+0xa28/0xf40 [ 35.350513] process_one_work+0xa30/0x1710 [ 35.351400] worker_thread+0x62a/0x13e0 [ 35.352234] kthread+0x40c/0x500 [ 35.352952] ret_from_fork+0x22/0x30 [ 35.353729] [ 35.354066] The buggy address belongs to the object at ffff88800cb1c400 [ 35.354066] which belongs to the cache kmalloc-512 of size 512 [ 35.356637] The buggy address is located 320 bytes inside of [ 35.356637] 512-byte region [ffff88800cb1c400, ffff88800cb1c600) [ 35.359047] The buggy address belongs to the page: [ 35.360053] page:00000000689339e9 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0xcb1c [ 35.362013] head:00000000689339e9 order:2 compound_mapcount:0 compound_pincount:0 [ 35.363573] flags: 0x100000000010200(slab|head|node=0|zone=1) [ 35.364819] raw: 0100000000010200 ffffea0000349f00 dead000000000002 ffff888007841c80 [ 35.366439] raw: 0000000000000000 0000000000100010 00000001ffffffff 0000000000000000 [ 35.368048] page dumped because: kasan: bad access detected [ 35.369221] [ 35.369560] Memory state around the buggy address: [ 35.370577] ffff88800cb1c400: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 35.372085] ffff88800cb1c480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 35.373596] >ffff88800cb1c500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 35.375103] ^ [ 35.376221] ffff88800cb1c580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 35.377747] ffff88800cb1c600: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 35.379248] ================================================================== [ 35.422741] cgroup: Unknown subsys name 'hugetlb' [ 35.424481] cgroup: Unknown subsys name 'rlimit' executing program executing program executing program VM DIAGNOSIS: 11:39:23 Registers: info registers vcpu 0 RAX=ffffffff84078af0 RBX=ffffffff85032600 RCX=ffffffff8405abe1 RDX=ffffed100d9c7143 RSI=0000000000000001 RDI=ffffffff84078eaf RBP=0000000000000000 RSP=ffffffff85007e40 R8 =0000000000000000 R9 =ffff88806ce38a13 R10=ffffed100d9c7142 R11=0000000000000001 R12=fffffbfff0a064c0 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 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=000055849f1ac220 CR3=0000000008fd4000 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 7465677261742e79 636e656772656d65 YMM02=0000000000000000 0000000000000000 ffffffffffffffff 0f0e0d0c0b0a0908 YMM03=0000000000000000 0000000000000000 0000000000000073 66626c7465677568 YMM04=0000000000000000 0000000000000000 2e2e2e2e2e2e2e2e 2e2e2e2e2e2e2e2e YMM05=0000000000000000 0000000000000000 396633353937322d 353330382d636539 YMM06=0000000000000000 0000000000000000 0000000000000061 0000000000000000 YMM07=0000000000000000 0000000000000000 0000000000000000 0000000000000000 YMM08=0000000000000000 0000000000000000 6564636261393837 3635343332313040 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=0000000000000020 RBX=00000000000003f8 RCX=0000000000000000 RDX=00000000000003f8 RSI=ffffffff823640e1 RDI=ffffffff87381a60 RBP=ffffffff87381a20 RSP=ffff888009aa7648 R8 =0000000000000000 R9 =0000000000000020 R10=ffffffff82365d23 R11=000000000000000a R12=0000000000000020 R13=0000000000000020 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=00007f376de555f0 CR3=000000001b758000 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 414e0833562b4b44 YMM01=0000000000000000 0000000000000000 0000000000000000 3f847ae147ae147b YMM02=0000000000000000 0000000000000000 0000000000000000 0000000000000000 YMM03=0000000000000000 0000000000000000 0000000000000000 3f7412d25198574e YMM04=0000000000000000 0000000000000000 00007ff570637f00 0000000000415710 YMM05=0000000000000000 0000000000000000 0000000000b12758 000000c0000ae748 YMM06=0000000000000000 0000000000000000 0000000000505007 000000c00002a7c0 YMM07=0000000000000000 0000000000000000 0000000000000000 0000000000000000 YMM08=0000000000000000 0000000000000000 00000000004643c6 0000000000000000 YMM09=0000000000000000 0000000000000000 00000000004643c1 0000000000000000 YMM10=0000000000000000 0000000000000000 000000c00059e100 000000c0001586e0 YMM11=0000000000000000 0000000000000000 0000000000000000 0000000000000000 YMM12=0000000000000000 0000000000000000 0000000000000000 0000000000000000 YMM13=0000000000000000 0000000000000000 000000c00030e000 000000c0003060c0 YMM14=0000000000000000 0000000000000000 000000c00000e388 000000c00000e418 YMM15=0000000000000000 0000000000000000 000000c00000e4e0 000000c00000e440