R13: 00007fff51892cbf R14: 00007f6937123300 R15: 0000000000022000
------------[ cut here ]------------
kernfs_put: syz5/pids.events: released with incorrect active_ref 0
------------[ cut here ]------------
WARNING: CPU: 0 PID: 10152 at fs/kernfs/dir.c:531 kernfs_put.part.0+0x433/0x540
WARNING: CPU: 1 PID: 20416 at fs/kernfs/dir.c:504 kernfs_get.part.0+0x69/0x80
Modules linked in:
Modules linked in:
CPU: 1 PID: 20416 Comm: syz-executor.5 Not tainted 5.19.0-rc4-next-20220704 #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_get.part.0+0x69/0x80
CPU: 0 PID: 10152 Comm: kworker/0:2 Not tainted 5.19.0-rc4-next-20220704 #1
Code: 31 ff 89 ee e8 c8 0c a7 ff 85 ed 74 18 e8 ef 0f a7 ff be 04 00 00 00 48 89 df e8 d2 ba d9 ff f0 ff 03 5b 5d c3 e8 d7 0f a7 ff <0f> 0b eb df 48 89 df e8 7b b7 d9 ff eb c6 66 0f 1f 84 00 00 00 00
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.14.0-0-g155821a1990b-prebuilt.qemu.org 04/01/2014
RSP: 0018:ffff88806cf09c80 EFLAGS: 00010046
Workqueue: events kernfs_notify_workfn
RAX: 0000000000000000 RBX: ffff88800fdf2cb0 RCX: 0000000000000100
RDX: ffff88800eb49ac0 RSI: ffffffff819de5c9 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: ffff88800fdf2cb0 R15: ffff8880439fad30
Code: 03 80 3c 18 00 0f 85 ea 00 00 00 4d 8b 7d 38 e8 73 0b a7 ff 48 8b 14 24 44 89 f1 4c 89 fe 48 c7 c7 e0 58 72 84 e8 93 9c 6c 02 <0f> 0b e9 b9 fc ff ff 48 89 ef e8 0e b3 d9 ff e9 c1 fd ff ff e8 04
FS: 0000555555c2b400(0000) GS:ffff88806cf00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
RSP: 0018:ffff888046c5fbd8 EFLAGS: 00010286
CR2: 00007f8b3cda99c8 CR3: 000000004abde000 CR4: 0000000000350ee0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff4ff0 DR7: 0000000000000400
Call Trace:
kernfs_get+0x1b/0x30
RAX: 0000000000000000 RBX: dffffc0000000000 RCX: 0000000000000000
kernfs_notify+0x180/0x350
RDX: ffff888045731ac0 RSI: ffffffff812bd348 RDI: ffffed1008d8bf6d
cgroup_file_notify+0xf5/0x1a0
RBP: ffff88800fdf2ce8 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000080000000 R11: 0000000000000001 R12: ffff88800fdf2cb0
call_timer_fn+0x17d/0x5f0
R13: ffff8880439f0910 R14: 0000000000000000 R15: ffff888017564460
FS: 0000000000000000(0000) GS:ffff88806ce00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f47bcacfb00 CR3: 000000000e9e2000 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
kernfs_notify_workfn+0x417/0x560
run_timer_softirq+0xae/0x1a0
__do_softirq+0x1c8/0x8cc
process_one_work+0xa0f/0x1690
__irq_exit_rcu+0x113/0x170
irq_exit_rcu+0x5/0x20
sysvec_apic_timer_interrupt+0x8e/0xc0
asm_sysvec_apic_timer_interrupt+0x1b/0x20
worker_thread+0x637/0x1250
RIP: 0010:refill_obj_stock+0x319/0x610
Code: 02 00 00 49 c7 45 28 00 00 00 00 48 c7 c6 02 9f 79 81 4c 89 ef e8 87 cf af ff 48 83 3c 24 00 74 06 e8 cb 23 d2 ff fb 4d 85 f6 <74> 08 4c 89 f7 e8 7d 69 ff ff 45 85 ff 0f 85 8a 00 00 00 48 83 c4
RSP: 0018:ffff88804a0f7a70 EFLAGS: 00000286
RAX: 0000000000001375 RBX: ffff88806cf34ba0 RCX: 1ffffffff0b1ce59
kthread+0x2ed/0x3a0
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffff88806cf34bc8 R08: 0000000000000001 R09: 0000000000000001
R10: 0000000000000000 R11: 0000000000000001 R12: ffff88800e495000
R13: ffff88806cf34ba0 R14: ffff88803fdf5500 R15: 0000000000000001
ret_from_fork+0x22/0x30
obj_cgroup_charge+0x3e0/0x8d0
irq event stamp: 316219
kmem_cache_alloc_node+0x99/0x4a0
hardirqs last enabled at (316229): [] asm_sysvec_apic_timer_interrupt+0x1b/0x20
copy_process+0x4d2/0x6d60
hardirqs last disabled at (316240): [] sysvec_apic_timer_interrupt+0xb/0xc0
softirqs last enabled at (313936): [] __irq_exit_rcu+0x113/0x170
softirqs last disabled at (313929): [] __irq_exit_rcu+0x113/0x170
---[ end trace 0000000000000000 ]---
kernel_clone+0xe7/0xa60
__do_sys_clone+0xba/0x100
do_syscall_64+0x3b/0x90
entry_SYSCALL_64_after_hwframe+0x46/0xb0
RIP: 0033:0x7f8b3f033f41
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:00007ffd33f4da18 EFLAGS: 00000206 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 00007f8b3c587700 RCX: 00007f8b3f033f41
RDX: 00007f8b3c5879d0 RSI: 00007f8b3c5872f0 RDI: 00000000003d0f00
RBP: 00007ffd33f4dc50 R08: 00007f8b3c587700 R09: 00007f8b3c587700
R10: 00007f8b3c5879d0 R11: 0000000000000206 R12: 00007ffd33f4dace
R13: 00007ffd33f4dacf R14: 00007f8b3c587300 R15: 0000555555c2cd50
irq event stamp: 4987
hardirqs last enabled at (4986): [] _raw_spin_unlock_irq+0x1f/0x40
hardirqs last disabled at (4987): [] _raw_spin_lock_irqsave+0x4e/0x50
softirqs last enabled at (4936): [] __irq_exit_rcu+0x113/0x170
softirqs last disabled at (4983): [] __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 ffff88800fdf2cb0 by task syz-executor.5/20416
CPU: 1 PID: 20416 Comm: syz-executor.5 Tainted: G W 5.19.0-rc4-next-20220704 #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:refill_obj_stock+0x319/0x610
Code: 02 00 00 49 c7 45 28 00 00 00 00 48 c7 c6 02 9f 79 81 4c 89 ef e8 87 cf af ff 48 83 3c 24 00 74 06 e8 cb 23 d2 ff fb 4d 85 f6 <74> 08 4c 89 f7 e8 7d 69 ff ff 45 85 ff 0f 85 8a 00 00 00 48 83 c4
RSP: 0018:ffff88804a0f7a70 EFLAGS: 00000286
RAX: 0000000000001375 RBX: ffff88806cf34ba0 RCX: 1ffffffff0b1ce59
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffff88806cf34bc8 R08: 0000000000000001 R09: 0000000000000001
R10: 0000000000000000 R11: 0000000000000001 R12: ffff88800e495000
R13: ffff88806cf34ba0 R14: ffff88803fdf5500 R15: 0000000000000001
obj_cgroup_charge+0x3e0/0x8d0
kmem_cache_alloc_node+0x99/0x4a0
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: 0033:0x7f8b3f033f41
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:00007ffd33f4da18 EFLAGS: 00000206 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 00007f8b3c587700 RCX: 00007f8b3f033f41
RDX: 00007f8b3c5879d0 RSI: 00007f8b3c5872f0 RDI: 00000000003d0f00
RBP: 00007ffd33f4dc50 R08: 00007f8b3c587700 R09: 00007f8b3c587700
R10: 00007f8b3c5879d0 R11: 0000000000000206 R12: 00007ffd33f4dace
R13: 00007ffd33f4dacf R14: 00007f8b3c587300 R15: 0000555555c2cd50
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 10152:
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 ffff88800fdf2cb0
which belongs to the cache kernfs_node_cache of size 168
The buggy address is located 0 bytes inside of
168-byte region [ffff88800fdf2cb0, ffff88800fdf2d58)
The buggy address belongs to the physical page:
page:00000000c50892f1 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0xfdf2
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:
ffff88800fdf2b80: 00 fc fc fc fc fc fc fc fc 00 00 00 00 00 00 00
ffff88800fdf2c00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 fc fc
>ffff88800fdf2c80: fc fc fc fc fc fc fa fb fb fb fb fb fb fb fb fb
^
ffff88800fdf2d00: fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc fc
ffff88800fdf2d80: fc fc fc 00 00 00 00 00 00 00 00 00 00 00 00 00
==================================================================
FAULT_INJECTION: forcing a failure.
name fail_usercopy, interval 1, probability 0, space 0, times 0
CPU: 1 PID: 20875 Comm: syz-executor.0 Tainted: G B W 5.19.0-rc4-next-20220704 #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
should_fail.cold+0x5/0xa
_copy_to_user+0x2a/0x140
do_ip_getsockopt+0xa7d/0x18d0
ip_getsockopt+0x84/0x1c0
raw_getsockopt+0x1a1/0x1d0
__sys_getsockopt+0x14c/0x250
__x64_sys_getsockopt+0xba/0x150
do_syscall_64+0x3b/0x90
entry_SYSCALL_64_after_hwframe+0x46/0xb0
RIP: 0033:0x7f037825eb19
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:00007f03757d4188 EFLAGS: 00000246 ORIG_RAX: 0000000000000037
RAX: ffffffffffffffda RBX: 00007f0378371f60 RCX: 00007f037825eb19
RDX: 000000000000000d RSI: 0000000000000000 RDI: 0000000000000003
RBP: 00007f03757d41d0 R08: 0000000020000340 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001
R13: 00007ffe57207fef R14: 00007f03757d4300 R15: 0000000000022000
FAULT_INJECTION: forcing a failure.
name fail_usercopy, interval 1, probability 0, space 0, times 0
CPU: 0 PID: 21353 Comm: syz-executor.0 Tainted: G B W 5.19.0-rc4-next-20220704 #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
should_fail.cold+0x5/0xa
_copy_to_user+0x2a/0x140
simple_read_from_buffer+0xcc/0x160
proc_fail_nth_read+0x194/0x220
vfs_read+0x1ea/0x5d0
ksys_read+0x127/0x250
do_syscall_64+0x3b/0x90
entry_SYSCALL_64_after_hwframe+0x46/0xb0
RIP: 0033:0x7f037821169c
Code: ec 28 48 89 54 24 18 48 89 74 24 10 89 7c 24 08 e8 f9 fc ff ff 48 8b 54 24 18 48 8b 74 24 10 41 89 c0 8b 7c 24 08 31 c0 0f 05 <48> 3d 00 f0 ff ff 77 34 44 89 c7 48 89 44 24 08 e8 2f fd ff ff 48
RSP: 002b:00007f03757d4170 EFLAGS: 00000246 ORIG_RAX: 0000000000000000
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f037821169c
RDX: 000000000000000f RSI: 00007f03757d41e0 RDI: 0000000000000004
RBP: 00007f03757d41d0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001
R13: 00007ffe57207fef R14: 00007f03757d4300 R15: 0000000000022000
----------------
Code disassembly (best guess):
0: 02 00 add (%rax),%al
2: 00 49 c7 add %cl,-0x39(%rcx)
5: 45 28 00 sub %r8b,(%r8)
8: 00 00 add %al,(%rax)
a: 00 48 c7 add %cl,-0x39(%rax)
d: c6 02 9f movb $0x9f,(%rdx)
10: 79 81 jns 0xffffff93
12: 4c 89 ef mov %r13,%rdi
15: e8 87 cf af ff callq 0xffafcfa1
1a: 48 83 3c 24 00 cmpq $0x0,(%rsp)
1f: 74 06 je 0x27
21: e8 cb 23 d2 ff callq 0xffd223f1
26: fb sti
27: 4d 85 f6 test %r14,%r14
* 2a: 74 08 je 0x34 <-- trapping instruction
2c: 4c 89 f7 mov %r14,%rdi
2f: e8 7d 69 ff ff callq 0xffff69b1
34: 45 85 ff test %r15d,%r15d
37: 0f 85 8a 00 00 00 jne 0xc7
3d: 48 rex.W
3e: 83 .byte 0x83
3f: c4 .byte 0xc4