------------[ cut here ]------------
kernfs_put: syz7/memory.events.local: released with incorrect active_ref 0
WARNING: CPU: 0 PID: 120 at fs/kernfs/dir.c:531 kernfs_put.part.0+0x433/0x540
Modules linked in:
------------[ cut here ]------------
WARNING: CPU: 1 PID: 4127 at fs/kernfs/dir.c:504 kernfs_get.part.0+0x69/0x80
CPU: 0 PID: 120 Comm: kworker/0:3 Not tainted 5.19.0-rc4-next-20220701 #1
Modules linked in:
CPU: 1 PID: 4127 Comm: syz-executor.7 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
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
Workqueue: events kernfs_notify_workfn
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:ffff88806cf09c80 EFLAGS: 00010046
RAX: 0000000000000000 RBX: ffff888018217bc8 RCX: 0000000000000100
RIP: 0010:kernfs_put.part.0+0x433/0x540
RDX: ffff8880157b5040 RSI: ffffffff819d2579 RDI: 0000000000000005
RBP: 0000000000000000 R08: 0000000000000005 R09: 0000000000000000
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
R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000001
R13: 1ffffffff0a01e40 R14: ffff888018217bc8 R15: ffff8880428cc4f0
FS: 00007f408fb0f700(0000) GS:ffff88806cf00000(0000) knlGS:0000000000000000
RSP: 0018:ffff888018297bd8 EFLAGS: 00010286
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b32e32000 CR3: 0000000042838000 CR4: 0000000000350ee0
Call Trace:
RAX: 0000000000000000 RBX: dffffc0000000000 RCX: 0000000000000000
kernfs_get+0x1b/0x30
kernfs_notify+0x180/0x350
RDX: ffff888016e90000 RSI: ffffffff812b6848 RDI: ffffed1003052f6d
cgroup_file_notify+0xf5/0x1a0
RBP: ffff888018217c00 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000001 R12: ffff888018217bc8
call_timer_fn+0x17d/0x5f0
R13: ffff88801867c2b8 R14: 0000000000000000 R15: ffff888008d5c2a8
FS: 0000000000000000(0000) GS:ffff88806ce00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020060000 CR3: 000000003ac4a000 CR4: 0000000000350ef0
Call Trace:
__run_timers.part.0+0x65e/0xa50
kernfs_put+0x42/0x50
run_timer_softirq+0xae/0x1a0
kernfs_notify_workfn+0x417/0x560
__do_softirq+0x1c8/0x8cc
__irq_exit_rcu+0x113/0x170
irq_exit_rcu+0x5/0x20
sysvec_apic_timer_interrupt+0x8e/0xc0
asm_sysvec_apic_timer_interrupt+0x1b/0x20
RIP: 0010:lock_release+0x3dd/0x750
Code: ff ff ff ff 65 0f c1 05 49 70 d9 7e 83 f8 01 0f 85 ad 01 00 00 48 f7 04 24 00 02 00 00 74 01 fb 48 b8 00 00 00 00 00 fc ff df <48> 01 c5 48 c7 45 00 00 00 00 00 c7 45 08 00 00 00 00 48 8b 84 24
RSP: 0018:ffff8880450d73e8 EFLAGS: 00000206
RAX: dffffc0000000000 RBX: 78df3f4a673aa3ba RCX: ffff8880450d7438
RDX: 1ffff11002af6b35 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 1ffff11008a1ae7f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000001 R12: 0000000000000003
R13: 0000000000000004 R14: ffff8880157b59b0 R15: ffff8880157b5040
xa_load+0x158/0x290
list_lru_count_one+0x1bb/0x2e0
super_cache_count+0x1b7/0x2f0
do_shrink_slab+0x83/0xb00
shrink_slab+0x3d7/0x6e0
process_one_work+0xa0f/0x1690
shrink_node+0x892/0x1d10
worker_thread+0x637/0x1250
do_try_to_free_pages+0x3c7/0x1670
kthread+0x2ed/0x3a0
try_to_free_mem_cgroup_pages+0x304/0x880
ret_from_fork+0x22/0x30
try_charge_memcg+0x4c2/0x13c0
irq event stamp: 95273
hardirqs last enabled at (95283): [] asm_sysvec_apic_timer_interrupt+0x1b/0x20
hardirqs last disabled at (95292): [] sysvec_apic_timer_interrupt+0xb/0xc0
softirqs last enabled at (95146): [] __irq_exit_rcu+0x113/0x170
mem_cgroup_charge_skmem+0x7c/0x1b0
softirqs last disabled at (95093): [] __irq_exit_rcu+0x113/0x170
---[ end trace 0000000000000000 ]---
random: crng reseeded on system resumption
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: 0033:0x7f40925bab19
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:00007f408fb0f188 EFLAGS: 00000246 ORIG_RAX: 0000000000000036
RAX: ffffffffffffffda RBX: 00007f40926ce020 RCX: 00007f40925bab19
RDX: 0000000000000049 RSI: 0000000000000001 RDI: 0000000000000007
RBP: 00007f4092614f6d R08: 0000000000000010 R09: 0000000000000000
R10: 0000000020000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fff7a10d52f R14: 00007f408fb0f300 R15: 0000000000022000
irq event stamp: 2823
hardirqs last enabled at (2822): [] _raw_spin_unlock_irq+0x1f/0x40
hardirqs last disabled at (2823): [] _raw_spin_lock_irqsave+0x4e/0x50
softirqs last enabled at (2550): [] __irq_exit_rcu+0x113/0x170
softirqs last disabled at (2815): [] __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 ffff888018217bc8 by task syz-executor.7/4127
CPU: 1 PID: 4127 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:
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
call_timer_fn+0x17d/0x5f0
__run_timers.part.0+0x65e/0xa50
run_timer_softirq+0xae/0x1a0
__do_softirq+0x1c8/0x8cc
__irq_exit_rcu+0x113/0x170
irq_exit_rcu+0x5/0x20
sysvec_apic_timer_interrupt+0x8e/0xc0
asm_sysvec_apic_timer_interrupt+0x1b/0x20
RIP: 0010:lock_release+0x3dd/0x750
Code: ff ff ff ff 65 0f c1 05 49 70 d9 7e 83 f8 01 0f 85 ad 01 00 00 48 f7 04 24 00 02 00 00 74 01 fb 48 b8 00 00 00 00 00 fc ff df <48> 01 c5 48 c7 45 00 00 00 00 00 c7 45 08 00 00 00 00 48 8b 84 24
RSP: 0018:ffff8880450d73e8 EFLAGS: 00000206
RAX: dffffc0000000000 RBX: 78df3f4a673aa3ba RCX: ffff8880450d7438
RDX: 1ffff11002af6b35 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 1ffff11008a1ae7f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000001 R12: 0000000000000003
R13: 0000000000000004 R14: ffff8880157b59b0 R15: ffff8880157b5040
xa_load+0x158/0x290
list_lru_count_one+0x1bb/0x2e0
super_cache_count+0x1b7/0x2f0
do_shrink_slab+0x83/0xb00
shrink_slab+0x3d7/0x6e0
shrink_node+0x892/0x1d10
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: 0033:0x7f40925bab19
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:00007f408fb0f188 EFLAGS: 00000246 ORIG_RAX: 0000000000000036
RAX: ffffffffffffffda RBX: 00007f40926ce020 RCX: 00007f40925bab19
RDX: 0000000000000049 RSI: 0000000000000001 RDI: 0000000000000007
RBP: 00007f4092614f6d R08: 0000000000000010 R09: 0000000000000000
R10: 0000000020000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fff7a10d52f R14: 00007f408fb0f300 R15: 0000000000022000
Allocated by task 293:
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 120:
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 ffff888018217bc8
which belongs to the cache kernfs_node_cache of size 168
The buggy address is located 0 bytes inside of
168-byte region [ffff888018217bc8, ffff888018217c70)
The buggy address belongs to the physical page:
page:0000000084296839 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x18217
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:
ffff888018217a80: 00 00 00 00 fc fc fc fc fc fc fc fc 00 00 00 00
ffff888018217b00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff888018217b80: 00 fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb
^
ffff888018217c00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fc fc
ffff888018217c80: fc fc fc fc fc fc 00 00 00 00 00 00 00 00 00 00
==================================================================
Restarting kernel threads ... done.
random: crng reseeded on system resumption
----------------
Code disassembly (best guess), 3 bytes skipped:
0: ff 65 0f jmpq *0xf(%rbp)
3: c1 05 49 70 d9 7e 83 roll $0x83,0x7ed97049(%rip) # 0x7ed97053
a: f8 clc
b: 01 0f add %ecx,(%rdi)
d: 85 ad 01 00 00 48 test %ebp,0x48000001(%rbp)
13: f7 04 24 00 02 00 00 testl $0x200,(%rsp)
1a: 74 01 je 0x1d
1c: fb sti
1d: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax
24: fc ff df
* 27: 48 01 c5 add %rax,%rbp <-- trapping instruction
2a: 48 c7 45 00 00 00 00 movq $0x0,0x0(%rbp)
31: 00
32: c7 45 08 00 00 00 00 movl $0x0,0x8(%rbp)
39: 48 rex.W
3a: 8b .byte 0x8b
3b: 84 .byte 0x84
3c: 24 .byte 0x24