------------[ cut here ]------------
kernfs_put: syz5/memory.events.local: released with incorrect active_ref 0
WARNING: CPU: 0 PID: 3955 at fs/kernfs/dir.c:531 kernfs_put.part.0+0x433/0x540
Modules linked in:
CPU: 0 PID: 3955 Comm: kworker/0:3 Not tainted 5.19.0-rc4-next-20220630 #1
------------[ cut here ]------------
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.14.0-0-g155821a1990b-prebuilt.qemu.org 04/01/2014
WARNING: CPU: 1 PID: 13348 at fs/kernfs/dir.c:504 kernfs_get.part.0+0x69/0x80
Workqueue: events kernfs_notify_workfn
Modules linked in:
CPU: 1 PID: 13348 Comm: syz-executor.3 Not tainted 5.19.0-rc4-next-20220630 #1
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.14.0-0-g155821a1990b-prebuilt.qemu.org 04/01/2014
RIP: 0010:kernfs_put.part.0+0x433/0x540
RIP: 0010:kernfs_get.part.0+0x69/0x80
Code: 03 80 3c 18 00 0f 85 ea 00 00 00 4d 8b 7d 38 e8 73 0a a7 ff 48 8b 14 24 44 89 f1 4c 89 fe 48 c7 c7 20 58 72 84 e8 7e 40 6c 02 <0f> 0b e9 b9 fc ff ff 48 89 ef e8 fe bb d9 ff e9 c1 fd ff ff e8 f4
Code: 31 ff 89 ee e8 c8 0b a7 ff 85 ed 74 18 e8 ef 0e a7 ff be 04 00 00 00 48 89 df e8 c2 c3 d9 ff f0 ff 03 5b 5d c3 e8 d7 0e a7 ff <0f> 0b eb df 48 89 df e8 6b c0 d9 ff eb c6 66 0f 1f 84 00 00 00 00
RSP: 0018:ffff88806cf09c80 EFLAGS: 00010046
RSP: 0018:ffff8880448d7bd8 EFLAGS: 00010286
RAX: 0000000000000000 RBX: ffff88800f134910 RCX: 0000000000000100
RDX: ffff88804906b580 RSI: ffffffff819d50a9 RDI: 0000000000000005
RBP: 0000000000000000 R08: 0000000000000005 R09: 0000000000000000
RAX: 0000000000000000 RBX: dffffc0000000000 RCX: 0000000000000000
R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000001
RDX: ffff8880208fb580 RSI: ffffffff812b68e8 RDI: ffffed100891af6d
R13: 1ffffffff0a01e40 R14: ffff88800f134910 R15: ffff888044b744f0
FS: 00007f61a812c700(0000) GS:ffff88806cf00000(0000) knlGS:0000000000000000
RBP: ffff88800f134948 R08: 0000000000000005 R09: 0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f61a892d9c8 CR3: 000000004a012000 CR4: 0000000000350ee0
R10: 0000000080000000 R11: 0000000000000001 R12: ffff88800f134910
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff4ff0 DR7: 0000000000000400
R13: ffff888018b05000 R14: 0000000000000000 R15: ffff88801775f190
Call Trace:
kernfs_get+0x1b/0x30
FS: 0000000000000000(0000) GS:ffff88806ce00000(0000) knlGS:0000000000000000
kernfs_notify+0x180/0x350
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
cgroup_file_notify+0xf5/0x1a0
CR2: 0000001b2e522000 CR3: 000000004a71a000 CR4: 0000000000350ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
call_timer_fn+0x17d/0x5f0
DR3: 0000000000000000 DR6: 00000000ffff4ff0 DR7: 0000000000000400
Call Trace:
kernfs_put+0x42/0x50
kernfs_notify_workfn+0x417/0x560
__run_timers.part.0+0x65e/0xa50
process_one_work+0xa17/0x1690
run_timer_softirq+0xae/0x1a0
worker_thread+0x637/0x1250
__do_softirq+0x270/0x8c7
__irq_exit_rcu+0x113/0x170
irq_exit_rcu+0x5/0x20
sysvec_apic_timer_interrupt+0x8e/0xc0
kthread+0x2f2/0x3b0
asm_sysvec_apic_timer_interrupt+0x1b/0x20
RIP: 0010:__sanitizer_cov_trace_switch+0x5d/0x90
ret_from_fork+0x22/0x30
Code: 85 f6 74 1e 48 8b 74 dd 10 48 8b 4c 24 28 4c 89 e2 4c 89 ef 48 83 c3 01 e8 20 fe ff ff 49 39 de 75 e2 5b 5d 41 5c 41 5d 41 5e 41 bd 07 00 00 00 48 83 f8 40 74 c2 5b 5d 41 5c 41 5d 41 5e c3
RSP: 0018:ffff88804548fda0 EFLAGS: 00000246
irq event stamp: 2317345
RAX: 0000000000000002 RBX: 0000000000000000 RCX: ffffffff8139a223
hardirqs last enabled at (2317355): [] asm_sysvec_apic_timer_interrupt+0x1b/0x20
RDX: ffff88804906b580 RSI: 0000000000000000 RDI: 0000000000000005
hardirqs last disabled at (2317364): [] sysvec_apic_timer_interrupt+0xb/0xc0
RBP: 1ffff11008a91fb8 R08: 0000000000000005 R09: 000000000000000d
softirqs last enabled at (2316376): [] __irq_exit_rcu+0x113/0x170
R10: 0000000000000001 R11: 0000000000000001 R12: 00007f61aacc9f6c
softirqs last disabled at (2316185): [] __irq_exit_rcu+0x113/0x170
R13: 00000000000f4240 R14: 0000000000000001 R15: 0000000000000000
---[ end trace 0000000000000000 ]---
do_futex+0x183/0x380
__x64_sys_futex+0x1c6/0x4c0
do_syscall_64+0x3b/0x90
entry_SYSCALL_64_after_hwframe+0x46/0xb0
RIP: 0033:0x7f61aabb6b19
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:00007f61a812c218 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: ffffffffffffffda RBX: 00007f61aacc9f68 RCX: 00007f61aabb6b19
RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 00007f61aacc9f6c
RBP: 00007f61aacc9f60 R08: 000000000000000b R09: 0000000000000000
R10: ffffffffffffffff R11: 0000000000000246 R12: 00007f61aacc9f6c
R13: 00007ffef8acbb1f R14: 00007f61a812c300 R15: 0000000000022000
irq event stamp: 1455
hardirqs last enabled at (1454): [] _raw_spin_unlock_irq+0x1f/0x40
hardirqs last disabled at (1455): [] _raw_spin_lock_irqsave+0x4e/0x50
softirqs last enabled at (1278): [] __irq_exit_rcu+0x113/0x170
softirqs last disabled at (1447): [] __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 ffff88800f134910 by task syz-executor.3/13348
CPU: 1 PID: 13348 Comm: syz-executor.3 Tainted: G W 5.19.0-rc4-next-20220630 #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+0xbe/0x1c0
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+0x270/0x8c7
__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:__sanitizer_cov_trace_switch+0x5d/0x90
Code: 85 f6 74 1e 48 8b 74 dd 10 48 8b 4c 24 28 4c 89 e2 4c 89 ef 48 83 c3 01 e8 20 fe ff ff 49 39 de 75 e2 5b 5d 41 5c 41 5d 41 5e 41 bd 07 00 00 00 48 83 f8 40 74 c2 5b 5d 41 5c 41 5d 41 5e c3
RSP: 0018:ffff88804548fda0 EFLAGS: 00000246
RAX: 0000000000000002 RBX: 0000000000000000 RCX: ffffffff8139a223
RDX: ffff88804906b580 RSI: 0000000000000000 RDI: 0000000000000005
RBP: 1ffff11008a91fb8 R08: 0000000000000005 R09: 000000000000000d
R10: 0000000000000001 R11: 0000000000000001 R12: 00007f61aacc9f6c
R13: 00000000000f4240 R14: 0000000000000001 R15: 0000000000000000
do_futex+0x183/0x380
__x64_sys_futex+0x1c6/0x4c0
do_syscall_64+0x3b/0x90
entry_SYSCALL_64_after_hwframe+0x46/0xb0
RIP: 0033:0x7f61aabb6b19
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:00007f61a812c218 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: ffffffffffffffda RBX: 00007f61aacc9f68 RCX: 00007f61aabb6b19
RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 00007f61aacc9f6c
RBP: 00007f61aacc9f60 R08: 000000000000000b R09: 0000000000000000
R10: ffffffffffffffff R11: 0000000000000246 R12: 00007f61aacc9f6c
R13: 00007ffef8acbb1f R14: 00007f61a812c300 R15: 0000000000022000
Allocated by task 298:
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 3955:
kasan_save_stack+0x1e/0x40
kasan_set_track+0x21/0x30
kasan_set_free_info+0x20/0x30
____kasan_slab_free+0x14b/0x1a0
kmem_cache_free+0xfb/0x600
kernfs_put.part.0+0x2c7/0x540
kernfs_put+0x42/0x50
kernfs_notify_workfn+0x417/0x560
process_one_work+0xa17/0x1690
worker_thread+0x637/0x1250
kthread+0x2f2/0x3b0
ret_from_fork+0x22/0x30
The buggy address belongs to the object at ffff88800f134910
which belongs to the cache kernfs_node_cache of size 168
The buggy address is located 0 bytes inside of
168-byte region [ffff88800f134910, ffff88800f1349b8)
The buggy address belongs to the physical page:
page:00000000df97b865 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0xf134
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:
ffff88800f134800: fc fc fc fc fc 00 00 00 00 00 00 00 00 00 00 00
ffff88800f134880: 00 00 00 00 00 00 00 00 00 00 fc fc fc fc fc fc
>ffff88800f134900: fc fc fa fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff88800f134980: fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc 00
ffff88800f134a00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
==================================================================
----------------
Code disassembly (best guess):
0: 85 f6 test %esi,%esi
2: 74 1e je 0x22
4: 48 8b 74 dd 10 mov 0x10(%rbp,%rbx,8),%rsi
9: 48 8b 4c 24 28 mov 0x28(%rsp),%rcx
e: 4c 89 e2 mov %r12,%rdx
11: 4c 89 ef mov %r13,%rdi
14: 48 83 c3 01 add $0x1,%rbx
18: e8 20 fe ff ff callq 0xfffffe3d
1d: 49 39 de cmp %rbx,%r14
20: 75 e2 jne 0x4
22: 5b pop %rbx
23: 5d pop %rbp
24: 41 5c pop %r12
26: 41 5d pop %r13
28: 41 5e pop %r14
* 2a: c3 retq <-- trapping instruction
2b: 41 bd 07 00 00 00 mov $0x7,%r13d
31: 48 83 f8 40 cmp $0x40,%rax
35: 74 c2 je 0xfffffff9
37: 5b pop %rbx
38: 5d pop %rbp
39: 41 5c pop %r12
3b: 41 5d pop %r13
3d: 41 5e pop %r14
3f: c3 retq