R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001
R13: 00007ffc5448696f R14: 00007f8a0cd7e300 R15: 0000000000022000
</TASK>
------------[ cut here ]------------
kernfs_put: syz7/memory.events: released with incorrect active_ref 0
WARNING: CPU: 1 PID: 7438 at fs/kernfs/dir.c:531 kernfs_put.part.0+0x433/0x540
Modules linked in:
CPU: 1 PID: 7438 Comm: kworker/1:1 Not tainted 5.19.0-rc4-next-20220701 #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
------------[ cut here ]------------
RIP: 0010:kernfs_put.part.0+0x433/0x540
WARNING: CPU: 0 PID: 8502 at fs/kernfs/dir.c:504 kernfs_get.part.0+0x69/0x80
Code: 03 80 3c 18 00 0f 85 ea 00 00 00 4d 8b 7d 38 e8 53 42 a7 ff 48 8b 14 24 44 89 f1 4c 89 fe 48 c7 c7 a0 58 72 84 e8 97 1c 6c 02 <0f> 0b e9 b9 fc ff ff 48 89 ef e8 8e b6 d9 ff e9 c1 fd ff ff e8 84
Modules linked in:
CPU: 0 PID: 8502 Comm: syz-executor.7 Not tainted 5.19.0-rc4-next-20220701 #1
RSP: 0018:ffff888045137bd8 EFLAGS: 00010286
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.14.0-0-g155821a1990b-prebuilt.qemu.org 04/01/2014
RIP: 0010:kernfs_get.part.0+0x69/0x80
Code: 31 ff 89 ee e8 a8 43 a7 ff 85 ed 74 18 e8 cf 46 a7 ff be 04 00 00 00 48 89 df e8 52 be d9 ff f0 ff 03 5b 5d c3 e8 b7 46 a7 ff <0f> 0b eb df 48 89 df e8 fb ba d9 ff eb c6 66 0f 1f 84 00 00 00 00
RSP: 0018:ffff88801d8f76f8 EFLAGS: 00010046
RAX: 0000000000040000 RBX: ffff888041a819f8 RCX: ffffc900035e2000
RDX: 0000000000040000 RSI: ffffffff819d2579 RDI: 0000000000000005
RAX: 0000000000000000 RBX: dffffc0000000000 RCX: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000001
RDX: ffff8880456e8000 RSI: ffffffff812b6848 RDI: ffffed1008a26f6d
R13: 1ffffffff0a01e40 R14: ffff888041a819f8 R15: ffff8880458bc490
FS: 00007fbfad679700(0000) GS:ffff88806ce00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fb744fe2000 CR3: 000000000e21e000 CR4: 0000000000350ef0
RBP: ffff888041a81a30 R08: 0000000000000005 R09: 0000000000000000
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
R10: 0000000080000000 R11: 0000000000000001 R12: ffff888041a819f8
DR3: 0000000000000000 DR6: 00000000ffff4ff0 DR7: 0000000000000400
R13: ffff88804482f1d0 R14: 0000000000000000 R15: ffff8880442cc028
Call Trace:
<TASK>
kernfs_get+0x1b/0x30
kernfs_notify+0x180/0x350
FS: 0000000000000000(0000) GS:ffff88806cf00000(0000) knlGS:0000000000000000
cgroup_file_notify+0xf5/0x1a0
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
shrink_node+0x75f/0x1d10
do_try_to_free_pages+0x3c7/0x1670
CR2: 00007f8a0cd7df78 CR3: 000000000d762000 CR4: 0000000000350ee0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
try_to_free_mem_cgroup_pages+0x304/0x880
DR3: 0000000000000000 DR6: 00000000ffff4ff0 DR7: 0000000000000400
Call Trace:
<TASK>
try_charge_memcg+0x4c2/0x13c0
kernfs_put+0x42/0x50
kernfs_notify_workfn+0x417/0x560
mem_cgroup_charge_skmem+0x7c/0x1b0
process_one_work+0xa0f/0x1690
sock_setsockopt+0x2080/0x34a0
worker_thread+0x637/0x1250
__sys_setsockopt+0x258/0x2a0
kthread+0x2ed/0x3a0
__x64_sys_setsockopt+0xba/0x150
ret_from_fork+0x22/0x30
do_syscall_64+0x3b/0x90
</TASK>
entry_SYSCALL_64_after_hwframe+0x46/0xb0
irq event stamp: 372483
RIP: 0033:0x7fbfb0103b19
hardirqs last enabled at (372493): [<ffffffff84200ccb>] asm_sysvec_apic_timer_interrupt+0x1b/0x20
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48
hardirqs last disabled at (372502): [<ffffffff8418afab>] sysvec_apic_timer_interrupt+0xb/0xc0
RSP: 002b:00007fbfad679188 EFLAGS: 00000246
softirqs last enabled at (372050): [<ffffffff811662a3>] __irq_exit_rcu+0x113/0x170
ORIG_RAX: 0000000000000036
RAX: ffffffffffffffda RBX: 00007fbfb0216f60 RCX: 00007fbfb0103b19
softirqs last disabled at (372041): [<ffffffff811662a3>] __irq_exit_rcu+0x113/0x170
RDX: 0000000000000049 RSI: 0000000000000001 RDI: 0000000000000005
---[ end trace 0000000000000000 ]---
RBP: 00007fbfb015df6d R08: 0000000000000010 R09: 0000000000000000
R10: 0000000020000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffc0bda0ebf R14: 00007fbfad679300 R15: 0000000000022000
</TASK>
irq event stamp: 6298
hardirqs last enabled at (6297): [<ffffffff84200ccb>] asm_sysvec_apic_timer_interrupt+0x1b/0x20
hardirqs last disabled at (6298): [<ffffffff841ab87e>] _raw_spin_lock_irqsave+0x4e/0x50
softirqs last enabled at (5576): [<ffffffff811662a3>] __irq_exit_rcu+0x113/0x170
softirqs last disabled at (5539): [<ffffffff811662a3>] __irq_exit_rcu+0x113/0x170
---[ end trace 0000000000000000 ]---
==================================================================
BUG: KASAN: use-after-free in kernfs_get.part.0+0x5e/0x80
Write of size 4 at addr ffff888041a819f8 by task syz-executor.7/8502
CPU: 0 PID: 8502 Comm: syz-executor.7 Tainted: G W 5.19.0-rc4-next-20220701 #1
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.14.0-0-g155821a1990b-prebuilt.qemu.org 04/01/2014
Call Trace:
<TASK>
dump_stack_lvl+0x8b/0xb3
print_report.cold+0x5e/0x5e1
kasan_report+0xb1/0x1b0
kasan_check_range+0x35/0x1b0
kernfs_get.part.0+0x5e/0x80
kernfs_get+0x1b/0x30
kernfs_notify+0x180/0x350
cgroup_file_notify+0xf5/0x1a0
shrink_node+0x75f/0x1d10
do_try_to_free_pages+0x3c7/0x1670
try_to_free_mem_cgroup_pages+0x304/0x880
try_charge_memcg+0x4c2/0x13c0
mem_cgroup_charge_skmem+0x7c/0x1b0
sock_setsockopt+0x2080/0x34a0
__sys_setsockopt+0x258/0x2a0
__x64_sys_setsockopt+0xba/0x150
do_syscall_64+0x3b/0x90
entry_SYSCALL_64_after_hwframe+0x46/0xb0
RIP: 0033:0x7fbfb0103b19
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fbfad679188 EFLAGS: 00000246 ORIG_RAX: 0000000000000036
RAX: ffffffffffffffda RBX: 00007fbfb0216f60 RCX: 00007fbfb0103b19
RDX: 0000000000000049 RSI: 0000000000000001 RDI: 0000000000000005
RBP: 00007fbfb015df6d R08: 0000000000000010 R09: 0000000000000000
R10: 0000000020000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffc0bda0ebf R14: 00007fbfad679300 R15: 0000000000022000
</TASK>
Allocated by task 294:
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 7438:
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 ffff888041a819f8
which belongs to the cache kernfs_node_cache of size 168
The buggy address is located 0 bytes inside of
168-byte region [ffff888041a819f8, ffff888041a81aa0)
The buggy address belongs to the physical page:
page:00000000b0746a39 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x41a81
flags: 0x100000000000200(slab|node=0|zone=1)
raw: 0100000000000200 0000000000000000 dead000000000122 ffff8880080718c0
raw: 0000000000000000 0000000000110011 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
Memory state around the buggy address:
ffff888041a81880: 00 00 00 00 00 00 00 00 00 00 fc fc fc fc fc fc
ffff888041a81900: fc fc 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff888041a81980: 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc fa
^
ffff888041a81a00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff888041a81a80: fb fb fb fb fc fc fc fc fc fc fc fc 00 00 00 00
==================================================================
----------------
Code disassembly (best guess), 1 bytes skipped:
0: ff c3 inc %ebx
2: 66 2e 0f 1f 84 00 00 nopw %cs:0x0(%rax,%rax,1)
9: 00 00 00
c: 0f 1f 40 00 nopl 0x0(%rax)
10: 48 89 f8 mov %rdi,%rax
13: 48 89 f7 mov %rsi,%rdi
16: 48 89 d6 mov %rdx,%rsi
19: 48 89 ca mov %rcx,%rdx
1c: 4d 89 c2 mov %r8,%r10
1f: 4d 89 c8 mov %r9,%r8
22: 4c 8b 4c 24 08 mov 0x8(%rsp),%r9
27: 0f 05 syscall
* 29: 48 3d 01 f0 ff ff cmp $0xfffffffffffff001,%rax <-- trapping instruction
2f: 73 01 jae 0x32
31: c3 retq
32: 48 c7 c1 bc ff ff ff mov $0xffffffffffffffbc,%rcx
39: f7 d8 neg %eax
3b: 64 89 01 mov %eax,%fs:(%rcx)
3e: 48 rex.W