------------[ cut here ]------------
kernfs_put: syz1/memory.events.local: released with incorrect active_ref 0
WARNING: CPU: 1 PID: 84 at fs/kernfs/dir.c:531 kernfs_put.part.0+0x433/0x540
Modules linked in:
CPU: 1 PID: 84 Comm: kworker/1:3 Not tainted 5.19.0-rc5-next-20220706 #1
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.14.0-0-g155821a1990b-prebuilt.qemu.org 04/01/2014
Workqueue: events kernfs_notify_workfn
RIP: 0010:kernfs_put.part.0+0x433/0x540
Code: 03 80 3c 18 00 0f 85 ea 00 00 00 4d 8b 7d 38 e8 53 fc a6 ff 48 8b 14 24 44 89 f1 4c 89 fe 48 c7 c7 e0 5b 72 84 e8 13 aa 6c 02 <0f> 0b e9 b9 fc ff ff 48 89 ef e8 0e b3 d9 ff e9 c1 fd ff ff e8 04
RSP: 0018:ffff88800fab7bd8 EFLAGS: 00010286
RAX: 0000000000000000 RBX: dffffc0000000000 RCX: 0000000000000000
RDX: ffff88800fac3580 RSI: ffffffff812bd348 RDI: ffffed1001f56f6d
RBP: ffff888008aefb18 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000080000000 R11: 0000000000000001 R12: ffff888008aefae0
R13: ffff88801d3fa1d0 R14: 0000000000000000 R15: ffff888014c6cb18
FS: 0000000000000000(0000) GS:ffff88806cf00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2d924000 CR3: 0000000038a3e000 CR4: 0000000000350ee0
Call Trace:
kernfs_put+0x42/0x50
kernfs_notify_workfn+0x417/0x560
process_one_work+0xa0f/0x1690
worker_thread+0x637/0x1250
kthread+0x2ed/0x3a0
ret_from_fork+0x22/0x30
irq event stamp: 269033
hardirqs last enabled at (269045): [] __up_console_sem+0x78/0x80
hardirqs last disabled at (269054): [] __up_console_sem+0x5d/0x80
softirqs last enabled at (268710): [] __irq_exit_rcu+0x113/0x170
softirqs last disabled at (268273): [] __irq_exit_rcu+0x113/0x170
---[ end trace 0000000000000000 ]---
==================================================================
BUG: KASAN: use-after-free in llist_del_first+0x89/0xa0
Read of size 8 at addr ffff888008aefb60 by task kworker/1:3/84
CPU: 1 PID: 84 Comm: kworker/1:3 Tainted: G W 5.19.0-rc5-next-20220706 #1
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.14.0-0-g155821a1990b-prebuilt.qemu.org 04/01/2014
Workqueue: events kernfs_notify_workfn
Call Trace:
dump_stack_lvl+0x8b/0xb3
print_report.cold+0x5e/0x5e1
kasan_report+0xb1/0x1b0
llist_del_first+0x89/0xa0
kernfs_notify_workfn+0x78/0x560
process_one_work+0xa0f/0x1690
worker_thread+0x637/0x1250
kthread+0x2ed/0x3a0
ret_from_fork+0x22/0x30
Allocated by task 297:
kasan_save_stack+0x1e/0x40
__kasan_slab_alloc+0x66/0x80
kmem_cache_alloc+0x1b1/0x490
__kernfs_new_node+0xd4/0x8b0
kernfs_new_node+0x93/0x120
__kernfs_create_file+0x51/0x350
cgroup_addrm_files+0x3e2/0x9d0
css_populate_dir+0x19b/0x450
cgroup_apply_control_enable+0x3ae/0xa40
cgroup_mkdir+0x824/0x11f0
kernfs_iop_mkdir+0x149/0x1d0
vfs_mkdir+0x417/0x6a0
do_mkdirat+0x17b/0x2e0
__x64_sys_mkdir+0xf2/0x140
do_syscall_64+0x3b/0x90
entry_SYSCALL_64_after_hwframe+0x46/0xb0
Freed by task 84:
kasan_save_stack+0x1e/0x40
kasan_set_track+0x21/0x30
kasan_set_free_info+0x20/0x30
__kasan_slab_free+0x108/0x190
kmem_cache_free+0xfb/0x600
kernfs_put.part.0+0x2c7/0x540
kernfs_put+0x42/0x50
kernfs_notify_workfn+0x417/0x560
process_one_work+0xa0f/0x1690
worker_thread+0x637/0x1250
kthread+0x2ed/0x3a0
ret_from_fork+0x22/0x30
The buggy address belongs to the object at ffff888008aefae0
which belongs to the cache kernfs_node_cache of size 168
The buggy address is located 128 bytes inside of
168-byte region [ffff888008aefae0, ffff888008aefb88)
The buggy address belongs to the physical page:
page:000000003a4a94e4 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x8aef
flags: 0x100000000000200(slab|node=0|zone=1)
raw: 0100000000000200 0000000000000000 dead000000000122 ffff8880080358c0
raw: 0000000000000000 0000000000110011 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
Memory state around the buggy address:
ffff888008aefa00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff888008aefa80: fb fb fb fb fc fc fc fc fc fc fc fc fa fb fb fb
>ffff888008aefb00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff888008aefb80: fb fc fc fc fc fc fc fc fc 00 00 00 00 00 00 00
ffff888008aefc00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 fc fc
==================================================================
audit: type=1400 audit(1657107476.078:14): avc: denied { read } for pid=6786 comm="syz-executor.5" scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=perf_event permissive=1
general protection fault, probably for non-canonical address 0x21ce99903ffffc8: 0000 [#1] PREEMPT SMP KASAN NOPTI
CPU: 1 PID: 4022 Comm: systemd-udevd Tainted: G B W 5.19.0-rc5-next-20220706 #1
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.14.0-0-g155821a1990b-prebuilt.qemu.org 04/01/2014
RIP: 0010:qlist_free_all+0xaf/0x190
Code: 80 4c 01 c2 0f 82 f0 00 00 00 48 c7 c0 00 00 00 80 48 2b 05 c3 76 7b 03 48 01 d0 48 c1 e8 0c 48 c1 e0 06 48 03 05 a1 76 7b 03 <48> 8b 48 08 48 89 c2 f6 c1 01 0f 85 b6 00 00 00 0f 1f 44 00 00 48
RSP: 0018:ffff88803af7fcd0 EFLAGS: 00010207
RAX: 021ce99903ffffc0 RBX: 873f6ec0ffffffff RCX: 1ffffffff0b1d66d
RDX: 873f6ec17fffffff RSI: 0000000000000001 RDI: ffffffff81771eb1
RBP: 0000000000000000 R08: 873f6ec0ffffffff R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000001 R12: dffffc0000000000
R13: ffff88803af7fd10 R14: 0000000000000000 R15: ffff8880095161d4
FS: 00007f9b69caa8c0(0000) GS:ffff88806cf00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000000000000e CR3: 0000000037e5e000 CR4: 0000000000350ee0
Call Trace:
kasan_quarantine_reduce+0x180/0x200
__kasan_slab_alloc+0x78/0x80
kmem_cache_alloc+0x1b1/0x490
getname_flags.part.0+0x50/0x4f0
getname_flags+0x9a/0xe0
user_path_at_empty+0x2b/0x60
path_setxattr+0x92/0x1c0
__x64_sys_setxattr+0xc0/0x160
do_syscall_64+0x3b/0x90
entry_SYSCALL_64_after_hwframe+0x46/0xb0
RIP: 0033:0x7f9b6a166c9a
Code: 48 8b 0d f9 21 0c 00 f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 49 89 ca b8 bc 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d c6 21 0c 00 f7 d8 64 89 01 48
RSP: 002b:00007ffe0a695d68 EFLAGS: 00000246 ORIG_RAX: 00000000000000bc
RAX: ffffffffffffffda RBX: 0000000000000010 RCX: 00007f9b6a166c9a
RDX: 0000564761d7d9f0 RSI: 00007f9b6a272753 RDI: 00007ffe0a695dc0
RBP: 0000564761d7d9f0 R08: 0000000000000000 R09: 00007ffe0a695c40
R10: 000000000000001e R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffe0a695dc0 R14: 00007ffe0a695dc0 R15: 0000000000000010
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:qlist_free_all+0xaf/0x190
Code: 80 4c 01 c2 0f 82 f0 00 00 00 48 c7 c0 00 00 00 80 48 2b 05 c3 76 7b 03 48 01 d0 48 c1 e8 0c 48 c1 e0 06 48 03 05 a1 76 7b 03 <48> 8b 48 08 48 89 c2 f6 c1 01 0f 85 b6 00 00 00 0f 1f 44 00 00 48
RSP: 0018:ffff88803af7fcd0 EFLAGS: 00010207
RAX: 021ce99903ffffc0 RBX: 873f6ec0ffffffff RCX: 1ffffffff0b1d66d
RDX: 873f6ec17fffffff RSI: 0000000000000001 RDI: ffffffff81771eb1
RBP: 0000000000000000 R08: 873f6ec0ffffffff R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000001 R12: dffffc0000000000
R13: ffff88803af7fd10 R14: 0000000000000000 R15: ffff8880095161d4
FS: 00007f9b69caa8c0(0000) GS:ffff88806cf00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000000000000e CR3: 0000000037e5e000 CR4: 0000000000350ee0
----------------
Code disassembly (best guess), 1 bytes skipped:
0: 4c 01 c2 add %r8,%rdx
3: 0f 82 f0 00 00 00 jb 0xf9
9: 48 c7 c0 00 00 00 80 mov $0xffffffff80000000,%rax
10: 48 2b 05 c3 76 7b 03 sub 0x37b76c3(%rip),%rax # 0x37b76da
17: 48 01 d0 add %rdx,%rax
1a: 48 c1 e8 0c shr $0xc,%rax
1e: 48 c1 e0 06 shl $0x6,%rax
22: 48 03 05 a1 76 7b 03 add 0x37b76a1(%rip),%rax # 0x37b76ca
* 29: 48 8b 48 08 mov 0x8(%rax),%rcx <-- trapping instruction
2d: 48 89 c2 mov %rax,%rdx
30: f6 c1 01 test $0x1,%cl
33: 0f 85 b6 00 00 00 jne 0xef
39: 0f 1f 44 00 00 nopl 0x0(%rax,%rax,1)
3e: 48 rex.W