------------[ cut here ]------------
kernfs_put: syz5/memory.events.local: released with incorrect active_ref 0
WARNING: CPU: 0 PID: 22251 at fs/kernfs/dir.c:531 kernfs_put.part.0+0x433/0x540
Modules linked in:
------------[ cut here ]------------
CPU: 0 PID: 22251 Comm: kworker/0:1 Not tainted 5.19.0-rc4-next-20220701 #1
WARNING: CPU: 1 PID: 89462 at fs/kernfs/dir.c:504 kernfs_get.part.0+0x69/0x80
Modules linked in:
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.14.0-0-g155821a1990b-prebuilt.qemu.org 04/01/2014
CPU: 1 PID: 89462 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
Workqueue: events kernfs_notify_workfn
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:ffff88806cf09c80 EFLAGS: 00010046
RAX: 0000000000000000 RBX: ffff88800e1212b8 RCX: 0000000000000100
RDX: ffff888045511ac0 RSI: ffffffff819d2579 RDI: 0000000000000005
RBP: 0000000000000000 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000001
RIP: 0010:kernfs_put.part.0+0x433/0x540
R13: 1ffffffff0a01e40 R14: ffff88800e1212b8 R15: ffff888044d7c4f0
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
FS: 00005555556f1400(0000) GS:ffff88806cf00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
RSP: 0018:ffff88801d907bd8 EFLAGS: 00010286
CR2: 00007ff8a2d1b718 CR3: 000000004416a000 CR4: 0000000000350ee0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff4ff0 DR7: 0000000000000400
Call Trace:
RAX: 0000000000000000 RBX: dffffc0000000000 RCX: 0000000000000000
kernfs_get+0x1b/0x30
kernfs_notify+0x180/0x350
RDX: ffff888046613580 RSI: ffffffff812b6848 RDI: ffffed1003b20f6d
cgroup_file_notify+0xf5/0x1a0
RBP: ffff88800e1212f0 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000001 R12: ffff88800e1212b8
call_timer_fn+0x17d/0x5f0
R13: ffff8880091d9910 R14: 0000000000000000 R15: ffff888014c55b18
FS: 0000000000000000(0000) GS:ffff88806ce00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020056000 CR3: 000000004611e000 CR4: 0000000000350ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
__run_timers.part.0+0x65e/0xa50
DR3: 0000000000000000 DR6: 00000000ffff4ff0 DR7: 0000000000000400
Call Trace:
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
process_one_work+0xa0f/0x1690
asm_sysvec_apic_timer_interrupt+0x1b/0x20
RIP: 0010:__orc_find+0x80/0xf0
Code: fa 02 48 01 d0 48 d1 f8 48 8d 5c 85 00 48 89 d8 48 c1 e8 03 42 0f b6 14 38 48 89 d8 83 e0 07 83 c0 03 38 d0 7c 04 84 d2 75 48 <48> 63 03 48 01 d8 48 39 c1 73 b0 4c 8d 63 fc 49 39 ec 73 b3 4d 29
RSP: 0018:ffff88801d407638 EFLAGS: 00000246
worker_thread+0x637/0x1250
RAX: 0000000000000003 RBX: ffffffff8599c298 RCX: ffffffff81767d14
RDX: 0000000000000000 RSI: ffffffff85cb55ae RDI: ffffffff8599c290
RBP: ffffffff8599c298 R08: ffffffff85cb55ae R09: ffffffff85cbc4d0
R10: ffffed1003a80eed R11: 000000000003403b R12: ffffffff8599c298
R13: ffffffff8599c290 R14: ffffffff8599c294 R15: dffffc0000000000
kthread+0x2ed/0x3a0
ret_from_fork+0x22/0x30
unwind_next_frame+0x2b0/0x20a0
irq event stamp: 1877641
hardirqs last enabled at (1877649): [] console_emit_next_record.constprop.0+0x648/0x800
hardirqs last disabled at (1877658): [] console_emit_next_record.constprop.0+0x667/0x800
arch_stack_walk+0x83/0xf0
softirqs last enabled at (1877234): [] __irq_exit_rcu+0x113/0x170
softirqs last disabled at (1877177): [] __irq_exit_rcu+0x113/0x170
stack_trace_save+0x8c/0xc0
---[ end trace 0000000000000000 ]---
kasan_save_stack+0x1e/0x40
__kasan_slab_alloc+0x66/0x80
kmem_cache_alloc+0x1b1/0x490
__create_object.isra.0+0x3d/0xc10
kmem_cache_alloc_node+0x255/0x4a0
copy_process+0x4d2/0x6d60
kernel_clone+0xe7/0xa60
__do_sys_clone+0xba/0x100
do_syscall_64+0x3b/0x90
entry_SYSCALL_64_after_hwframe+0x46/0xb0
RIP: 0033:0x7ff8a57c7f41
Code: 48 85 ff 74 3d 48 85 f6 74 38 48 83 ee 10 48 89 4e 08 48 89 3e 48 89 d7 4c 89 c2 4d 89 c8 4c 8b 54 24 08 b8 38 00 00 00 0f 05 <48> 85 c0 7c 13 74 01 c3 31 ed 58 5f ff d0 48 89 c7 b8 3c 00 00 00
RSP: 002b:00007ffcff589c08 EFLAGS: 00000206 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 00007ff8a2d1b700 RCX: 00007ff8a57c7f41
RDX: 00007ff8a2d1b9d0 RSI: 00007ff8a2d1b2f0 RDI: 00000000003d0f00
RBP: 00007ffcff589e40 R08: 00007ff8a2d1b700 R09: 00007ff8a2d1b700
R10: 00007ff8a2d1b9d0 R11: 0000000000000206 R12: 00007ffcff589cbe
R13: 00007ffcff589cbf R14: 00007ff8a2d1b300 R15: 0000000000022000
irq event stamp: 2695
hardirqs last enabled at (2694): [] _raw_spin_unlock_irq+0x1f/0x40
hardirqs last disabled at (2695): [] _raw_spin_lock_irqsave+0x4e/0x50
softirqs last enabled at (2214): [] __irq_exit_rcu+0x113/0x170
softirqs last disabled at (2687): [] __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 ffff88800e1212b8 by task syz-executor.7/89462
CPU: 1 PID: 89462 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:__orc_find+0x80/0xf0
Code: fa 02 48 01 d0 48 d1 f8 48 8d 5c 85 00 48 89 d8 48 c1 e8 03 42 0f b6 14 38 48 89 d8 83 e0 07 83 c0 03 38 d0 7c 04 84 d2 75 48 <48> 63 03 48 01 d8 48 39 c1 73 b0 4c 8d 63 fc 49 39 ec 73 b3 4d 29
RSP: 0018:ffff88801d407638 EFLAGS: 00000246
RAX: 0000000000000003 RBX: ffffffff8599c298 RCX: ffffffff81767d14
RDX: 0000000000000000 RSI: ffffffff85cb55ae RDI: ffffffff8599c290
RBP: ffffffff8599c298 R08: ffffffff85cb55ae R09: ffffffff85cbc4d0
R10: ffffed1003a80eed R11: 000000000003403b R12: ffffffff8599c298
R13: ffffffff8599c290 R14: ffffffff8599c294 R15: dffffc0000000000
unwind_next_frame+0x2b0/0x20a0
arch_stack_walk+0x83/0xf0
stack_trace_save+0x8c/0xc0
kasan_save_stack+0x1e/0x40
__kasan_slab_alloc+0x66/0x80
kmem_cache_alloc+0x1b1/0x490
__create_object.isra.0+0x3d/0xc10
kmem_cache_alloc_node+0x255/0x4a0
copy_process+0x4d2/0x6d60
kernel_clone+0xe7/0xa60
__do_sys_clone+0xba/0x100
do_syscall_64+0x3b/0x90
entry_SYSCALL_64_after_hwframe+0x46/0xb0
RIP: 0033:0x7ff8a57c7f41
Code: 48 85 ff 74 3d 48 85 f6 74 38 48 83 ee 10 48 89 4e 08 48 89 3e 48 89 d7 4c 89 c2 4d 89 c8 4c 8b 54 24 08 b8 38 00 00 00 0f 05 <48> 85 c0 7c 13 74 01 c3 31 ed 58 5f ff d0 48 89 c7 b8 3c 00 00 00
RSP: 002b:00007ffcff589c08 EFLAGS: 00000206 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 00007ff8a2d1b700 RCX: 00007ff8a57c7f41
RDX: 00007ff8a2d1b9d0 RSI: 00007ff8a2d1b2f0 RDI: 00000000003d0f00
RBP: 00007ffcff589e40 R08: 00007ff8a2d1b700 R09: 00007ff8a2d1b700
R10: 00007ff8a2d1b9d0 R11: 0000000000000206 R12: 00007ffcff589cbe
R13: 00007ffcff589cbf R14: 00007ff8a2d1b300 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 22251:
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 ffff88800e1212b8
which belongs to the cache kernfs_node_cache of size 168
The buggy address is located 0 bytes inside of
168-byte region [ffff88800e1212b8, ffff88800e121360)
The buggy address belongs to the physical page:
page:00000000304b739f refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0xe121
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:
ffff88800e121180: 00 00 fc fc fc fc fc fc fc fc 00 00 00 00 00 00
ffff88800e121200: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 fc
>ffff88800e121280: fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb fb
^
ffff88800e121300: fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc
ffff88800e121380: fc fc fc fc 00 00 00 00 00 00 00 00 00 00 00 00
==================================================================
----------------
Code disassembly (best guess):
0: fa cli
1: 02 48 01 add 0x1(%rax),%cl
4: d0 48 d1 rorb -0x2f(%rax)
7: f8 clc
8: 48 8d 5c 85 00 lea 0x0(%rbp,%rax,4),%rbx
d: 48 89 d8 mov %rbx,%rax
10: 48 c1 e8 03 shr $0x3,%rax
14: 42 0f b6 14 38 movzbl (%rax,%r15,1),%edx
19: 48 89 d8 mov %rbx,%rax
1c: 83 e0 07 and $0x7,%eax
1f: 83 c0 03 add $0x3,%eax
22: 38 d0 cmp %dl,%al
24: 7c 04 jl 0x2a
26: 84 d2 test %dl,%dl
28: 75 48 jne 0x72
* 2a: 48 63 03 movslq (%rbx),%rax <-- trapping instruction
2d: 48 01 d8 add %rbx,%rax
30: 48 39 c1 cmp %rax,%rcx
33: 73 b0 jae 0xffffffe5
35: 4c 8d 63 fc lea -0x4(%rbx),%r12
39: 49 39 ec cmp %rbp,%r12
3c: 73 b3 jae 0xfffffff1
3e: 4d rex.WRB
3f: 29 .byte 0x29