Starting Update UTMP about System Runlevel Changes... [ OK ] Finished Update UTMP about System Runlevel Changes. Debian GNU/Linux 11 syzkaller ttyS0 Warning: Permanently added '[localhost]:41976' (ECDSA) to the list of known hosts. 2021/12/06 11:30:20 fuzzer started 2021/12/06 11:30:20 dialing manager at localhost:35719 2021/12/06 11:30:20 checking machine... 2021/12/06 11:30:20 checking revisions... syzkaller login: [ 28.669132] kmemleak: Automatic memory scanning thread ended 2021/12/06 11:30:20 testing simple program... [ 28.727590] cgroup: Unknown subsys name 'net' [ 28.728921] cgroup: Unknown subsys name 'net_prio' [ 28.730702] cgroup: Unknown subsys name 'devices' [ 28.732915] cgroup: Unknown subsys name 'blkio' [ 28.760904] [ 28.761248] ========================= [ 28.761996] WARNING: held lock freed! [ 28.762741] 5.16.0-rc3-next-20211203 #1 Not tainted [ 28.763845] ------------------------- [ 28.765010] kworker/0:2/48 is freeing memory ffff88800999b000-ffff88800999b1ff, with a lock still held there! [ 28.767316] ffff88800999b148 (&root->kernfs_rwsem){++++}-{3:3}, at: __kernfs_remove+0x627/0xb00 [ 28.769069] 3 locks held by kworker/0:2/48: [ 28.769985] #0: ffff8880080a6138 ((wq_completion)cgroup_destroy){+.+.}-{0:0}, at: process_one_work+0x929/0x1710 [ 28.772039] #1: ffff88800b717da8 ((work_completion)(&(&css->destroy_rwork)->work)){+.+.}-{0:0}, at: process_one_work+0x95d/0x1710 [ 28.774395] #2: ffff88800999b148 (&root->kernfs_rwsem){++++}-{3:3}, at: __kernfs_remove+0x627/0xb00 [ 28.776223] [ 28.776223] stack backtrace: [ 28.777094] CPU: 0 PID: 48 Comm: kworker/0:2 Not tainted 5.16.0-rc3-next-20211203 #1 [ 28.778602] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.14.0-0-g155821a1990b-prebuilt.qemu.org 04/01/2014 [ 28.780796] Workqueue: cgroup_destroy css_free_rwork_fn [ 28.781845] Call Trace: [ 28.782372] [ 28.782808] dump_stack_lvl+0x8b/0xb3 [ 28.783550] debug_check_no_locks_freed.cold+0xa5/0xb1 [ 28.784592] ? kernfs_put.part.0+0x334/0x540 [ 28.785448] kfree+0xb3/0x5a0 [ 28.786057] ? kmem_cache_free+0xce/0x640 [ 28.786872] kernfs_put.part.0+0x334/0x540 [ 28.787695] kernfs_put+0x42/0x50 [ 28.788377] __kernfs_remove+0x7ce/0xb00 [ 28.789162] ? lock_is_held_type+0xd7/0x130 [ 28.790021] ? kernfs_next_descendant_post+0x2f0/0x2f0 [ 28.791082] ? down_write+0xde/0x150 [ 28.791824] ? down_write_killable_nested+0x180/0x180 [ 28.792853] kernfs_destroy_root+0x89/0xb0 [ 28.793699] css_free_rwork_fn+0xa28/0xf40 [ 28.794557] process_one_work+0xa30/0x1710 [ 28.795409] ? pwq_dec_nr_in_flight+0x2a0/0x2a0 [ 28.796480] ? rwlock_bug.part.0+0x90/0x90 [ 28.797326] ? _raw_spin_lock_irq+0x41/0x50 [ 28.798210] worker_thread+0x62a/0x13e0 [ 28.799007] ? process_one_work+0x1710/0x1710 [ 28.799890] kthread+0x40c/0x500 [ 28.800557] ? set_kthread_struct+0x130/0x130 [ 28.801442] ret_from_fork+0x22/0x30 [ 28.802204] [ 28.802773] ================================================================== [ 28.804197] BUG: KASAN: use-after-free in up_write+0x3ac/0x460 [ 28.805360] Read of size 8 at addr ffff88800999b140 by task kworker/0:2/48 [ 28.806734] [ 28.807056] CPU: 0 PID: 48 Comm: kworker/0:2 Not tainted 5.16.0-rc3-next-20211203 #1 [ 28.808600] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.14.0-0-g155821a1990b-prebuilt.qemu.org 04/01/2014 [ 28.810859] Workqueue: cgroup_destroy css_free_rwork_fn [ 28.811922] Call Trace: [ 28.812425] [ 28.812864] dump_stack_lvl+0x8b/0xb3 [ 28.813621] print_address_description.constprop.0+0x1f/0x180 [ 28.814787] ? up_write+0x3ac/0x460 [ 28.815502] ? up_write+0x3ac/0x460 [ 28.816223] kasan_report.cold+0x7f/0x11b [ 28.817046] ? up_write+0x3ac/0x460 [ 28.817761] up_write+0x3ac/0x460 [ 28.818458] css_free_rwork_fn+0xa28/0xf40 [ 28.819297] process_one_work+0xa30/0x1710 [ 28.820142] ? pwq_dec_nr_in_flight+0x2a0/0x2a0 [ 28.821059] ? rwlock_bug.part.0+0x90/0x90 [ 28.821891] ? _raw_spin_lock_irq+0x41/0x50 [ 28.822757] worker_thread+0x62a/0x13e0 [ 28.823546] ? process_one_work+0x1710/0x1710 [ 28.824433] kthread+0x40c/0x500 [ 28.825102] ? set_kthread_struct+0x130/0x130 [ 28.825983] ret_from_fork+0x22/0x30 [ 28.826727] [ 28.827179] [ 28.827496] Allocated by task 280: [ 28.828182] kasan_save_stack+0x1e/0x40 [ 28.828962] __kasan_kmalloc+0x81/0xa0 [ 28.829724] kernfs_create_root+0x4c/0x410 [ 28.830567] cgroup_setup_root+0x346/0xb60 [ 28.831406] cgroup1_get_tree+0xc1b/0x1370 [ 28.832255] vfs_get_tree+0x8e/0x2f0 [ 28.832987] path_mount+0x131b/0x1f80 [ 28.833737] __x64_sys_mount+0x27e/0x300 [ 28.834542] do_syscall_64+0x3b/0x90 [ 28.835271] entry_SYSCALL_64_after_hwframe+0x44/0xae [ 28.836284] [ 28.836600] Freed by task 48: [ 28.837203] kasan_save_stack+0x1e/0x40 [ 28.837983] kasan_set_track+0x21/0x30 [ 28.838767] kasan_set_free_info+0x20/0x30 [ 28.839599] __kasan_slab_free+0x108/0x170 [ 28.840422] kfree+0xc5/0x5a0 [ 28.841019] kernfs_put.part.0+0x334/0x540 [ 28.841828] kernfs_put+0x42/0x50 [ 28.842503] __kernfs_remove+0x7ce/0xb00 [ 28.843274] kernfs_destroy_root+0x89/0xb0 [ 28.844077] css_free_rwork_fn+0xa28/0xf40 [ 28.844886] process_one_work+0xa30/0x1710 [ 28.845695] worker_thread+0x62a/0x13e0 [ 28.846473] kthread+0x40c/0x500 [ 28.847117] ret_from_fork+0x22/0x30 [ 28.847830] [ 28.848140] The buggy address belongs to the object at ffff88800999b000 [ 28.848140] which belongs to the cache kmalloc-512 of size 512 [ 28.850507] The buggy address is located 320 bytes inside of [ 28.850507] 512-byte region [ffff88800999b000, ffff88800999b200) [ 28.852729] The buggy address belongs to the page: [ 28.853653] page:00000000e4227ee3 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x9998 [ 28.855428] head:00000000e4227ee3 order:2 compound_mapcount:0 compound_pincount:0 [ 28.856869] flags: 0x100000000010200(slab|head|node=0|zone=1) [ 28.857997] raw: 0100000000010200 ffffea00003bd200 dead000000000002 ffff888007841c80 [ 28.859516] raw: 0000000000000000 0000000000100010 00000001ffffffff 0000000000000000 [ 28.860997] page dumped because: kasan: bad access detected [ 28.862062] [ 28.862383] Memory state around the buggy address: [ 28.863315] ffff88800999b000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 28.864704] ffff88800999b080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 28.866079] >ffff88800999b100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 28.867472] ^ [ 28.868497] ffff88800999b180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 28.869875] ffff88800999b200: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 28.871271] ================================================================== [ 28.931558] cgroup: Unknown subsys name 'hugetlb' [ 28.934310] cgroup: Unknown subsys name 'rlimit' executing program executing program executing program VM DIAGNOSIS: 11:30:21 Registers: info registers vcpu 0 RAX=dffffc0000000060 RBX=00000000000003fd RCX=0000000000000000 RDX=00000000000003fd RSI=ffffffff8236405c RDI=ffffffff87381a60 RBP=ffffffff87381a20 RSP=ffff88800b7175f0 R8 =0000000000000029 R9 =000000000000002d R10=ffffffff8234ae1b R11=000000000000000a R12=0000000000000020 R13=fffffbfff0e70397 R14=fffffbfff0e7034e R15=dffffc0000000000 RIP=ffffffff823640b0 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=00007fffad7aa810 CR3=00000000093da000 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 000055a896254c00 7665642f7379732f YMM02=0000000000000000 0000000000000000 ffff0000000000ff 0000000000000000 YMM03=0000000000000000 0000000000000000 0000000000000000 000000ff000000ff YMM04=0000000000000000 0000000000000000 2f2f2f2f2f2f2f2f 2f2f2f2f2f2f2f2f YMM05=0000000000000000 0000000000000000 0000000061adf440 000000001016c3c2 YMM06=0000000000000000 0000000000000000 0000000061adf440 000000000f5fa8c2 YMM07=0000000000000000 0000000000000000 0000000000000000 000000000f5fa8c2 YMM08=0000000000000000 0000000000000000 6e753c0075252e75 252e75252e752500 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=0000000000000000 RBX=1ffff11002e5cf25 RCX=ffffffff840574ba RDX=1ffffffff0bf6919 RSI=ffffffff85fb4894 RDI=ffffffff85b97848 RBP=0000000000000001 RSP=ffff8880172e78e0 R8 =ffffffff85fb48c4 R9 =ffffffff85fb48c8 R10=ffffed1002e5cf45 R11=0000000000034044 R12=ffff8880172e7a18 R13=ffff8880172e7a01 R14=ffff8880172e79c0 R15=ffffffff840574ba RIP=ffffffff81114501 RFL=00000212 [----A--] 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=00007faddec27260 CR3=000000001d076000 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 756e696c2d34365f 3638782f62696c2f YMM01=0000000000000000 0000000000000000 732e747079726362 696c2f756e672d78 YMM02=0000000000000000 0000000000000000 00312e6f732e7470 79726362696c2f75 YMM03=0000000000000000 0000000000000000 6e672d78756e696c 2d34365f3638782f YMM04=0000000000000000 0000000000000000 0000000000000000 0000000000000000 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