[ OK ] Finished Update UTMP about System Runlevel Changes. Debian GNU/Linux 11 syzkaller ttyS0 Warning: Permanently added '[localhost]:46919' (ECDSA) to the list of known hosts. 2021/12/06 11:32:55 fuzzer started 2021/12/06 11:32:55 dialing manager at localhost:35719 2021/12/06 11:32:55 checking machine... 2021/12/06 11:32:55 checking revisions... syzkaller login: [ 29.863405] kmemleak: Automatic memory scanning thread ended 2021/12/06 11:32:55 testing simple program... [ 29.900737] cgroup: Unknown subsys name 'net' [ 29.902382] cgroup: Unknown subsys name 'net_prio' [ 29.903977] cgroup: Unknown subsys name 'devices' [ 29.907132] cgroup: Unknown subsys name 'blkio' [ 29.926873] [ 29.927283] ========================= [ 29.928155] WARNING: held lock freed! [ 29.929026] 5.16.0-rc3-next-20211203 #1 Not tainted [ 29.930307] ------------------------- [ 29.931620] kworker/1:0/18 is freeing memory ffff88800cc00400-ffff88800cc005ff, with a lock still held there! [ 29.934258] ffff88800cc00548 (&root->kernfs_rwsem){++++}-{3:3}, at: __kernfs_remove+0x627/0xb00 [ 29.936311] 3 locks held by kworker/1:0/18: [ 29.937297] #0: ffff8880080a6138 ((wq_completion)cgroup_destroy){+.+.}-{0:0}, at: process_one_work+0x929/0x1710 [ 29.939586] #1: ffff88800823fda8 ((work_completion)(&(&css->destroy_rwork)->work)){+.+.}-{0:0}, at: process_one_work+0x95d/0x1710 [ 29.941889] #2: ffff88800cc00548 (&root->kernfs_rwsem){++++}-{3:3}, at: __kernfs_remove+0x627/0xb00 [ 29.943732] [ 29.943732] stack backtrace: [ 29.944608] CPU: 1 PID: 18 Comm: kworker/1:0 Not tainted 5.16.0-rc3-next-20211203 #1 [ 29.946179] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.14.0-0-g155821a1990b-prebuilt.qemu.org 04/01/2014 [ 29.948431] Workqueue: cgroup_destroy css_free_rwork_fn [ 29.949478] Call Trace: [ 29.950006] [ 29.950459] dump_stack_lvl+0x8b/0xb3 [ 29.951215] debug_check_no_locks_freed.cold+0xa5/0xb1 [ 29.952279] ? kernfs_put.part.0+0x334/0x540 [ 29.953172] kfree+0xb3/0x5a0 [ 29.953789] ? kmem_cache_free+0xce/0x640 [ 29.954610] kernfs_put.part.0+0x334/0x540 [ 29.955456] kernfs_put+0x42/0x50 [ 29.956151] __kernfs_remove+0x7ce/0xb00 [ 29.956965] ? lock_is_held_type+0xd7/0x130 [ 29.957833] ? kernfs_next_descendant_post+0x2f0/0x2f0 [ 29.958883] ? down_write+0xde/0x150 [ 29.959624] ? down_write_killable_nested+0x180/0x180 [ 29.960651] kernfs_destroy_root+0x89/0xb0 [ 29.961494] css_free_rwork_fn+0xa28/0xf40 [ 29.962365] process_one_work+0xa30/0x1710 [ 29.963204] ? pwq_dec_nr_in_flight+0x2a0/0x2a0 [ 29.964131] ? rwlock_bug.part.0+0x90/0x90 [ 29.964970] ? _raw_spin_lock_irq+0x41/0x50 [ 29.965804] worker_thread+0x62a/0x13e0 [ 29.966593] ? process_one_work+0x1710/0x1710 [ 29.967479] kthread+0x40c/0x500 [ 29.968146] ? set_kthread_struct+0x130/0x130 [ 29.969035] ret_from_fork+0x22/0x30 [ 29.969784] [ 29.970351] ================================================================== [ 29.971787] BUG: KASAN: use-after-free in up_write+0x3ac/0x460 [ 29.972952] Read of size 8 at addr ffff88800cc00540 by task kworker/1:0/18 [ 29.974322] [ 29.974643] CPU: 1 PID: 18 Comm: kworker/1:0 Not tainted 5.16.0-rc3-next-20211203 #1 [ 29.976184] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.14.0-0-g155821a1990b-prebuilt.qemu.org 04/01/2014 [ 29.978404] Workqueue: cgroup_destroy css_free_rwork_fn [ 29.979446] Call Trace: [ 29.979949] [ 29.980387] dump_stack_lvl+0x8b/0xb3 [ 29.981133] print_address_description.constprop.0+0x1f/0x180 [ 29.982283] ? up_write+0x3ac/0x460 [ 29.982987] ? up_write+0x3ac/0x460 [ 29.983694] kasan_report.cold+0x7f/0x11b [ 29.984515] ? up_write+0x3ac/0x460 [ 29.985223] up_write+0x3ac/0x460 [ 29.985892] css_free_rwork_fn+0xa28/0xf40 [ 29.986711] process_one_work+0xa30/0x1710 [ 29.987525] ? pwq_dec_nr_in_flight+0x2a0/0x2a0 [ 29.988420] ? rwlock_bug.part.0+0x90/0x90 [ 29.989229] ? _raw_spin_lock_irq+0x41/0x50 [ 29.990076] worker_thread+0x62a/0x13e0 [ 29.990842] ? process_one_work+0x1710/0x1710 [ 29.991705] kthread+0x40c/0x500 [ 29.992354] ? set_kthread_struct+0x130/0x130 [ 29.993213] ret_from_fork+0x22/0x30 [ 29.993949] [ 29.994457] [ 29.994784] Allocated by task 281: [ 29.995451] kasan_save_stack+0x1e/0x40 [ 29.996216] __kasan_kmalloc+0x81/0xa0 [ 29.996956] kernfs_create_root+0x4c/0x410 [ 29.997760] cgroup_setup_root+0x346/0xb60 [ 29.998574] cgroup1_get_tree+0xc1b/0x1370 [ 29.999393] vfs_get_tree+0x8e/0x2f0 [ 30.000107] path_mount+0x131b/0x1f80 [ 30.000835] __x64_sys_mount+0x27e/0x300 [ 30.001609] do_syscall_64+0x3b/0x90 [ 30.002341] entry_SYSCALL_64_after_hwframe+0x44/0xae [ 30.003328] [ 30.003639] Freed by task 18: [ 30.004231] kasan_save_stack+0x1e/0x40 [ 30.004989] kasan_set_track+0x21/0x30 [ 30.005728] kasan_set_free_info+0x20/0x30 [ 30.006546] __kasan_slab_free+0x108/0x170 [ 30.007356] kfree+0xc5/0x5a0 [ 30.007951] kernfs_put.part.0+0x334/0x540 [ 30.008767] kernfs_put+0x42/0x50 [ 30.009424] __kernfs_remove+0x7ce/0xb00 [ 30.010205] kernfs_destroy_root+0x89/0xb0 [ 30.011001] css_free_rwork_fn+0xa28/0xf40 [ 30.011799] process_one_work+0xa30/0x1710 [ 30.012605] worker_thread+0x62a/0x13e0 [ 30.013355] kthread+0x40c/0x500 [ 30.014012] ret_from_fork+0x22/0x30 [ 30.014718] [ 30.015026] The buggy address belongs to the object at ffff88800cc00400 [ 30.015026] which belongs to the cache kmalloc-512 of size 512 [ 30.017356] The buggy address is located 320 bytes inside of [ 30.017356] 512-byte region [ffff88800cc00400, ffff88800cc00600) [ 30.019558] The buggy address belongs to the page: [ 30.020469] page:00000000935698bc refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0xcc00 [ 30.022229] head:00000000935698bc order:2 compound_mapcount:0 compound_pincount:0 [ 30.023646] flags: 0x100000000010200(slab|head|node=0|zone=1) [ 30.024766] raw: 0100000000010200 0000000000000000 dead000000000001 ffff888007841c80 [ 30.026236] raw: 0000000000000000 0000000080100010 00000001ffffffff 0000000000000000 [ 30.027747] page dumped because: kasan: bad access detected [ 30.028858] [ 30.029163] Memory state around the buggy address: [ 30.030116] ffff88800cc00400: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 30.031495] ffff88800cc00480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 30.032876] >ffff88800cc00500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 30.034265] ^ [ 30.035295] ffff88800cc00580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 30.036677] ffff88800cc00600: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 30.038075] ================================================================== [ 30.076088] cgroup: Unknown subsys name 'hugetlb' [ 30.078611] cgroup: Unknown subsys name 'rlimit' executing program executing program executing program VM DIAGNOSIS: 11:32:56 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=00007fa982f4ce00 CR3=000000001b382000 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 41379c7b00a9b83c YMM01=0000000000000000 0000000000000000 0000000000000000 3f847ae147ae147b YMM02=0000000000000000 0000000000000000 0000000000000000 0000000000000000 YMM03=0000000000000000 0000000000000000 0000000000000000 3f730984f05be308 YMM04=0000000000000000 0000000000000000 00007f0ac25bf800 0000000000415710 YMM05=0000000000000000 0000000000000000 0000000000000000 000000c0001f43e0 YMM06=0000000000000000 0000000000000000 0000000000505007 000000c00032b7c0 YMM07=0000000000000000 0000000000000000 0000000000000000 0000000000000000 YMM08=0000000000000000 0000000000000000 000000c00000ef60 0000000000000000 YMM09=0000000000000000 0000000000000000 00000000004643c1 0000000000000000 YMM10=0000000000000000 0000000000000000 000000c000508300 000000c000156b00 YMM11=0000000000000000 0000000000000000 0000000000000000 0000000000000000 YMM12=0000000000000000 0000000000000000 0000000000000000 0000000000000000 YMM13=0000000000000000 0000000000000000 00000000005e8f39 00000000005ec397 YMM14=0000000000000000 0000000000000000 000000000089d9b9 00000000008a446f YMM15=0000000000000000 0000000000000000 00000000004643c1 00000000004360f2 info registers vcpu 1 RAX=0000000000000031 RBX=00000000000003f8 RCX=0000000000000000 RDX=00000000000003f8 RSI=ffffffff823640e1 RDI=ffffffff87381a60 RBP=ffffffff87381a20 RSP=ffff88800823f648 R8 =0000000000000000 R9 =0000000000000031 R10=ffffffff82365d23 R11=000000000000000a R12=0000000000000031 R13=0000000000000031 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=00007ffd17096000 CR3=000000001b382000 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 0000000000000000 YMM02=0000000000000000 0000000000000000 0000000000000000 bfe62e42fefa39ef YMM03=0000000000000000 0000000000000000 0000ff0000000000 0000000000000000 YMM04=0000000000000000 0000000000000000 732f6c61636f6c2f 7273752f3d485441 YMM05=0000000000000000 0000000000000000 622f6c61636f6c2f 7273752f3a6e6962 YMM06=0000000000000000 0000000000000000 73752f3a6e696273 2f7273752f3a6e69 YMM07=0000000000000000 0000000000000000 6e69622f3a6e6962 732f3a6e69622f72 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