------------[ cut here ]------------
kernfs_put: syz4/pids.events: released with incorrect active_ref 0
WARNING: CPU: 0 PID: 9082 at fs/kernfs/dir.c:531 kernfs_put.part.0+0x433/0x540
Modules linked in:
CPU: 0 PID: 9082 Comm: kworker/0:0 Not tainted 5.19.0-rc5-next-20220706 #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_put.part.0+0x433/0x540
Code: 03 80 3c 18 00 0f 85 ea 00 00 00 4d 8b 7d 38 e8 53 fc a6 ff 48 8b 14 24 44 89 f1 4c 89 fe 48 c7 c7 e0 5b 72 84 e8 13 aa 6c 02 <0f> 0b e9 b9 fc ff ff 48 89 ef e8 0e b3 d9 ff e9 c1 fd ff ff e8 04
RSP: 0018:ffff8880451cfbd8 EFLAGS: 00010286
RAX: 0000000000000000 RBX: dffffc0000000000 RCX: 0000000000000000
RDX: ffff88801a8c1ac0 RSI: ffffffff812bd348 RDI: ffffed1008a39f6d
RBP: ffff88804321f948 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000001 R12: ffff88804321f910
R13: ffff888037f1d1d0 R14: 0000000000000000 R15: ffff88804533c9b0
FS: 0000000000000000(0000) GS:ffff88806ce00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f3b6ba20ef0 CR3: 000000001aac4000 CR4: 0000000000350ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff4ff0 DR7: 0000000000000400
Call Trace:
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
------------[ cut here ]------------
irq event stamp: 311953
WARNING: CPU: 1 PID: 14884 at fs/kernfs/dir.c:504 kernfs_get.part.0+0x69/0x80
hardirqs last enabled at (311961): [] console_emit_next_record.constprop.0+0x648/0x800
Modules linked in:
CPU: 1 PID: 14884 Comm: syz-executor.4 Not tainted 5.19.0-rc5-next-20220706 #1
hardirqs last disabled at (311972): [] sysvec_apic_timer_interrupt+0xb/0xc0
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
softirqs last enabled at (311706): [] __irq_exit_rcu+0x113/0x170
Code: 31 ff 89 ee e8 a8 fd a6 ff 85 ed 74 18 e8 cf 00 a7 ff be 04 00 00 00 48 89 df e8 d2 ba d9 ff f0 ff 03 5b 5d c3 e8 b7 00 a7 ff <0f> 0b eb df 48 89 df e8 7b b7 d9 ff eb c6 66 0f 1f 84 00 00 00 00
softirqs last disabled at (311699): [] __irq_exit_rcu+0x113/0x170
RSP: 0018:ffff888008b5fa40 EFLAGS: 00010093
RAX: 0000000000000000 RBX: ffff88804321f910 RCX: 0000000000000000
---[ end trace 0000000000000000 ]---
RDX: ffff8880461b8000 RSI: ffffffff819df849 RDI: 0000000000000005
RBP: 0000000000000000 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000001
R13: 1ffffffff0a01e40 R14: ffff88804321f910 R15: ffff88801aa1d930
FS: 000055555645a400(0000) GS:ffff88806cf00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f3b696b29c8 CR3: 0000000049178000 CR4: 0000000000350ee0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff4ff0 DR7: 0000000000000400
Call Trace:
==================================================================
BUG: KASAN: use-after-free in llist_del_first+0x89/0xa0
kernfs_get+0x1b/0x30
Read of size 8 at addr ffff888017d1c7c0 by task kworker/0:0/9082
kernfs_notify+0x180/0x350
CPU: 0 PID: 9082 Comm: kworker/0:0 Tainted: G W 5.19.0-rc5-next-20220706 #1
cgroup_file_notify+0xf5/0x1a0
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.14.0-0-g155821a1990b-prebuilt.qemu.org 04/01/2014
pids_can_fork+0x22f/0x370
Workqueue: events kernfs_notify_workfn
Call Trace:
cgroup_can_fork+0x332/0x11b0
dump_stack_lvl+0x8b/0xb3
copy_process+0x4023/0x6d60
print_report.cold+0x5e/0x5e1
kernel_clone+0xe7/0xa60
kasan_report+0xb1/0x1b0
llist_del_first+0x89/0xa0
kernfs_notify_workfn+0x78/0x560
__do_sys_clone+0xba/0x100
process_one_work+0xa0f/0x1690
do_syscall_64+0x3b/0x90
entry_SYSCALL_64_after_hwframe+0x46/0xb0
worker_thread+0x637/0x1250
RIP: 0033:0x7f3b6b93cf41
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:00007ffcd2749b98 EFLAGS: 00000206
kthread+0x2ed/0x3a0
ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 00007f3b68e90700 RCX: 00007f3b6b93cf41
ret_from_fork+0x22/0x30
RDX: 00007f3b68e909d0 RSI: 00007f3b68e902f0 RDI: 00000000003d0f00
RBP: 00007ffcd2749dd0 R08: 00007f3b68e90700 R09: 00007f3b68e90700
Allocated by task 3644:
R10: 00007f3b68e909d0 R11: 0000000000000206 R12: 00007ffcd2749c4e
kasan_save_stack+0x1e/0x40
R13: 00007ffcd2749c4f R14: 00007f3b68e90300 R15: 000055555645bd50
__kasan_slab_alloc+0x66/0x80
kmem_cache_alloc+0x1b1/0x490
irq event stamp: 3962
__kernfs_new_node+0xd4/0x8b0
hardirqs last enabled at (3961): [] _raw_spin_unlock_irq+0x1f/0x40
kernfs_new_node+0x93/0x120
hardirqs last disabled at (3962): [] _raw_spin_lock_irqsave+0x4e/0x50
__kernfs_create_file+0x51/0x350
softirqs last enabled at (3946): [] fpu_clone+0x3be/0xb00
cgroup_addrm_files+0x3e2/0x9d0
softirqs last disabled at (3944): [] fpu_clone+0x331/0xb00
css_populate_dir+0x19b/0x450
---[ end trace 0000000000000000 ]---
cgroup_apply_control_enable+0x3ae/0xa40
------------[ cut here ]------------
cgroup_mkdir+0x824/0x11f0
kernfs_iop_mkdir+0x149/0x1d0
vfs_mkdir+0x417/0x6a0
WARNING: CPU: 1 PID: 14884 at fs/kernfs/dir.c:504 kernfs_get.part.0+0x69/0x80
do_mkdirat+0x17b/0x2e0
Modules linked in:
__x64_sys_mkdir+0xf2/0x140
do_syscall_64+0x3b/0x90
CPU: 1 PID: 14884 Comm: syz-executor.4 Tainted: G W 5.19.0-rc5-next-20220706 #1
entry_SYSCALL_64_after_hwframe+0x46/0xb0
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.14.0-0-g155821a1990b-prebuilt.qemu.org 04/01/2014
Freed by task 9082:
RIP: 0010:kernfs_get.part.0+0x69/0x80
kasan_save_stack+0x1e/0x40
Code: 31 ff 89 ee e8 a8 fd a6 ff 85 ed 74 18 e8 cf 00 a7 ff be 04 00 00 00 48 89 df e8 d2 ba d9 ff f0 ff 03 5b 5d c3 e8 b7 00 a7 ff <0f> 0b eb df 48 89 df e8 7b b7 d9 ff eb c6 66 0f 1f 84 00 00 00 00
kasan_set_track+0x21/0x30
RSP: 0018:ffff88806cf09c80 EFLAGS: 00010046
kasan_set_free_info+0x20/0x30
__kasan_slab_free+0x108/0x190
RAX: 0000000000000000 RBX: ffff888017d1c740 RCX: 0000000000000100
kmem_cache_free+0xfb/0x600
RDX: ffff8880461b8000 RSI: ffffffff819df849 RDI: 0000000000000005
kernfs_put.part.0+0x2c7/0x540
RBP: 0000000000000000 R08: 0000000000000005 R09: 0000000000000000
kernfs_put+0x42/0x50
R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000001
kernfs_notify_workfn+0x417/0x560
R13: 1ffffffff0a01e40 R14: ffff888017d1c740 R15: ffff88803a74a530
process_one_work+0xa0f/0x1690
FS: 000055555645a400(0000) GS:ffff88806cf00000(0000) knlGS:0000000000000000
worker_thread+0x637/0x1250
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
kthread+0x2ed/0x3a0
CR2: 00007f3b696b29c8 CR3: 0000000049178000 CR4: 0000000000350ee0
ret_from_fork+0x22/0x30
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
The buggy address belongs to the object at ffff888017d1c740
which belongs to the cache kernfs_node_cache of size 168
DR3: 0000000000000000 DR6: 00000000ffff4ff0 DR7: 0000000000000400
The buggy address is located 128 bytes inside of
168-byte region [ffff888017d1c740, ffff888017d1c7e8)
Call Trace:
The buggy address belongs to the physical page:
page:00000000901b49af refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x17d1c
kernfs_get+0x1b/0x30
flags: 0x100000000000200(slab|node=0|zone=1)
kernfs_notify+0x180/0x350
raw: 0100000000000200 ffffea000037c980 dead000000000007 ffff8880080358c0
cgroup_file_notify+0xf5/0x1a0
raw: 0000000000000000 0000000000110011 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
call_timer_fn+0x17d/0x5f0
Memory state around the buggy address:
ffff888017d1c680: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
ffff888017d1c700: fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb
>ffff888017d1c780: fb fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc
^
__run_timers.part.0+0x65e/0xa50
ffff888017d1c800: fc fc fc fc fc 00 00 00 00 00 00 00 00 00 00 00
ffff888017d1c880: 00 00 00 00 00 00 00 00 00 00 fc fc fc fc fc fc
==================================================================
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:_raw_spin_unlock_irqrestore+0x2e/0x50
Code: 48 83 c7 18 53 48 89 f3 48 8b 74 24 10 e8 4a 51 0d fd 48 89 ef e8 b2 d2 0d fd 80 e7 02 74 06 e8 e8 a8 2f fd fb bf 01 00 00 00 8d 74 03 fd 65 8b 05 06 51 e6 7b 85 c0 74 03 5b 5d c3 0f 1f 44
RSP: 0018:ffff888008b5fab0 EFLAGS: 00000206
RAX: 0000000000000f7b RBX: 0000000000000293 RCX: ffffffff8128d13f
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000001
RBP: ffffffff85234640 R08: 0000000000000001 R09: ffffffff86a607d7
R10: fffffbfff0d4c0fa R11: 0000000000000001 R12: 00000000fffffff5
R13: ffff88801aa1d800 R14: dffffc0000000000 R15: dffffc0000000000
pids_can_fork+0x22f/0x370
cgroup_can_fork+0x332/0x11b0
copy_process+0x4023/0x6d60
kernel_clone+0xe7/0xa60
__do_sys_clone+0xba/0x100
do_syscall_64+0x3b/0x90
entry_SYSCALL_64_after_hwframe+0x46/0xb0
RIP: 0033:0x7f3b6b93cf41
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:00007ffcd2749b98 EFLAGS: 00000206 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 00007f3b68e90700 RCX: 00007f3b6b93cf41
RDX: 00007f3b68e909d0 RSI: 00007f3b68e902f0 RDI: 00000000003d0f00
RBP: 00007ffcd2749dd0 R08: 00007f3b68e90700 R09: 00007f3b68e90700
R10: 00007f3b68e909d0 R11: 0000000000000206 R12: 00007ffcd2749c4e
R13: 00007ffcd2749c4f R14: 00007f3b68e90300 R15: 000055555645bd50
irq event stamp: 3975
hardirqs last enabled at (3974): [] _raw_spin_unlock_irq+0x1f/0x40
hardirqs last disabled at (3975): [] _raw_spin_lock_irqsave+0x4e/0x50
softirqs last enabled at (3946): [] fpu_clone+0x3be/0xb00
softirqs last disabled at (3967): [] __irq_exit_rcu+0x113/0x170
---[ end trace 0000000000000000 ]---
kmemleak: 4 new suspected memory leaks (see /sys/kernel/debug/kmemleak)
----------------
Code disassembly (best guess):
0: 48 83 c7 18 add $0x18,%rdi
4: 53 push %rbx
5: 48 89 f3 mov %rsi,%rbx
8: 48 8b 74 24 10 mov 0x10(%rsp),%rsi
d: e8 4a 51 0d fd callq 0xfd0d515c
12: 48 89 ef mov %rbp,%rdi
15: e8 b2 d2 0d fd callq 0xfd0dd2cc
1a: 80 e7 02 and $0x2,%bh
1d: 74 06 je 0x25
1f: e8 e8 a8 2f fd callq 0xfd2fa90c
24: fb sti
25: bf 01 00 00 00 mov $0x1,%edi
* 2a: e8 8d 74 03 fd callq 0xfd0374bc <-- trapping instruction
2f: 65 8b 05 06 51 e6 7b mov %gs:0x7be65106(%rip),%eax # 0x7be6513c
36: 85 c0 test %eax,%eax
38: 74 03 je 0x3d
3a: 5b pop %rbx
3b: 5d pop %rbp
3c: c3 retq
3d: 0f .byte 0xf
3e: 1f (bad)
3f: 44 rex.R