------------[ cut here ]------------
kernfs_put: syz4/pids.events: released with incorrect active_ref 0
WARNING: CPU: 0 PID: 7286 at fs/kernfs/dir.c:531 kernfs_put.part.0+0x433/0x540
Modules linked in:
------------[ cut here ]------------
CPU: 0 PID: 7286 Comm: kworker/0:1 Not tainted 5.19.0-rc4-next-20220701 #1
WARNING: CPU: 1 PID: 301 at fs/kernfs/dir.c:504 kernfs_get.part.0+0x69/0x80
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.14.0-0-g155821a1990b-prebuilt.qemu.org 04/01/2014
Modules linked in:
Workqueue: events kernfs_notify_workfn
CPU: 1 PID: 301 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
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 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
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:ffff8880459d7bd8 EFLAGS: 00010286
RSP: 0018:ffff88806cf09c80 EFLAGS: 00010046
RAX: 0000000000000000 RBX: ffff8880157aecb0 RCX: 0000000000000100
RDX: ffff88800fa5b580 RSI: ffffffff819d2579 RDI: 0000000000000005
RBP: 0000000000000000 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000001
RAX: 0000000000000000 RBX: dffffc0000000000 RCX: 0000000000000000
R13: 1ffffffff0a01e40 R14: ffff8880157aecb0 R15: ffff88803f6acd30
FS: 0000555556cb5400(0000) GS:ffff88806cf00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
RDX: ffff88804b37d040 RSI: ffffffff812b6848 RDI: ffffed1008b3af6d
CR2: 00007f92e512e000 CR3: 0000000016fc4000 CR4: 0000000000350ee0
RBP: ffff8880157aece8 R08: 0000000000000005 R09: 0000000000000000
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff4ff0 DR7: 0000000000000400
Call Trace:
kernfs_get+0x1b/0x30
kernfs_notify+0x180/0x350
R10: 0000000080000000 R11: 0000000000000001 R12: ffff8880157aecb0
cgroup_file_notify+0xf5/0x1a0
R13: ffff88800db41910 R14: 0000000000000000 R15: ffff88803f271050
call_timer_fn+0x17d/0x5f0
FS: 0000000000000000(0000) GS:ffff88806ce00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f08e7ec5000 CR3: 000000004c956000 CR4: 0000000000350ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff4ff0 DR7: 0000000000000400
__run_timers.part.0+0x65e/0xa50
Call Trace:
kernfs_put+0x42/0x50
kernfs_notify_workfn+0x417/0x560
run_timer_softirq+0xae/0x1a0
__do_softirq+0x1c8/0x8cc
__irq_exit_rcu+0x113/0x170
irq_exit_rcu+0x5/0x20
process_one_work+0xa0f/0x1690
sysvec_apic_timer_interrupt+0x8e/0xc0
asm_sysvec_apic_timer_interrupt+0x1b/0x20
RIP: 0010:__sanitizer_cov_trace_pc+0xd/0x60
Code: 00 5d e9 c6 69 c3 00 66 0f 1f 44 00 00 48 8b be a8 01 00 00 e8 b4 ff ff ff 31 c0 c3 90 65 8b 05 49 02 be 7e 89 c1 48 8b 34 24 <81> e1 00 01 00 00 65 48 8b 14 25 c0 6e 02 00 a9 00 01 ff 00 74 0e
RSP: 0018:ffff888018527c40 EFLAGS: 00000296
RAX: 0000000080000000 RBX: ffff888018527d98 RCX: 0000000080000000
RDX: ffff88800fa5b580 RSI: ffffffff81356729 RDI: ffff888018527d98
RBP: ffff888018527d48 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000000
R13: ffff88800fa5b580 R14: ffff888018527dd8 R15: 0000000000000000
hrtimer_try_to_cancel+0x19/0x2b0
do_nanosleep+0x297/0x690
worker_thread+0x637/0x1250
hrtimer_nanosleep+0x257/0x6b0
kthread+0x2ed/0x3a0
common_nsleep+0xa2/0xc0
__x64_sys_clock_nanosleep+0x2fb/0x420
ret_from_fork+0x22/0x30
do_syscall_64+0x3b/0x90
entry_SYSCALL_64_after_hwframe+0x46/0xb0
RIP: 0033:0x7fe70dfe18e1
Code: 24 0c 89 3c 24 48 89 4c 24 18 e8 aa e7 ff ff 4c 8b 54 24 18 48 8b 54 24 10 41 89 c0 8b 74 24 0c 8b 3c 24 b8 e6 00 00 00 0f 05 <44> 89 c7 48 89 04 24 e8 e3 e7 ff ff 48 8b 04 24 eb 97 66 2e 0f 1f
irq event stamp: 516707
RSP: 002b:00007ffc5c67f170 EFLAGS: 00000293 ORIG_RAX: 00000000000000e6
RAX: ffffffffffffffda RBX: 0000000000000210 RCX: 00007fe70dfe18e1
RDX: 00007ffc5c67f1b0 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007ffc5c67f23c R08: 0000000000000000 R09: 00007ffc5c683080
hardirqs last enabled at (516719): [] asm_sysvec_apic_timer_interrupt+0x1b/0x20
R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000032
hardirqs last disabled at (516728): [] sysvec_apic_timer_interrupt+0xb/0xc0
R13: 000000000018bfbb R14: 0000000000000003 R15: 00007ffc5c67f2a0
softirqs last enabled at (516614): [] __irq_exit_rcu+0x113/0x170
irq event stamp: 1463093
softirqs last disabled at (516561): [] __irq_exit_rcu+0x113/0x170
hardirqs last enabled at (1463092): [] _raw_spin_unlock_irq+0x1f/0x40
---[ end trace 0000000000000000 ]---
hardirqs last disabled at (1463093): [] _raw_spin_lock_irqsave+0x4e/0x50
==================================================================
softirqs last enabled at (1461878): [] __irq_exit_rcu+0x113/0x170
BUG: KASAN: use-after-free in llist_del_first+0x89/0xa0
softirqs last disabled at (1463089): [] __irq_exit_rcu+0x113/0x170
Read of size 8 at addr ffff8880157aed30 by task kworker/0:1/7286
---[ end trace 0000000000000000 ]---
CPU: 0 PID: 7286 Comm: kworker/0:1 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
Workqueue: events kernfs_notify_workfn
Call Trace:
dump_stack_lvl+0x8b/0xb3
print_report.cold+0x5e/0x5e1
kasan_report+0xb1/0x1b0
llist_del_first+0x89/0xa0
kernfs_notify_workfn+0x78/0x560
process_one_work+0xa0f/0x1690
worker_thread+0x637/0x1250
kthread+0x2ed/0x3a0
ret_from_fork+0x22/0x30
Allocated by task 871:
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 7286:
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 ffff8880157aecb0
which belongs to the cache kernfs_node_cache of size 168
The buggy address is located 128 bytes inside of
168-byte region [ffff8880157aecb0, ffff8880157aed58)
The buggy address belongs to the physical page:
page:0000000098cbcff2 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x157ae
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:
ffff8880157aec00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 fc fc
ffff8880157aec80: fc fc fc fc fc fc fa fb fb fb fb fb fb fb fb fb
>ffff8880157aed00: fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc fc
^
ffff8880157aed80: fc fc fc 00 00 00 00 00 00 00 00 00 00 00 00 00
ffff8880157aee00: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc
==================================================================
cgroup: fork rejected by pids controller in /syz7
kmemleak: 34 new suspected memory leaks (see /sys/kernel/debug/kmemleak)
----------------
Code disassembly (best guess), 1 bytes skipped:
0: 5d pop %rbp
1: e9 c6 69 c3 00 jmpq 0xc369cc
6: 66 0f 1f 44 00 00 nopw 0x0(%rax,%rax,1)
c: 48 8b be a8 01 00 00 mov 0x1a8(%rsi),%rdi
13: e8 b4 ff ff ff callq 0xffffffcc
18: 31 c0 xor %eax,%eax
1a: c3 retq
1b: 90 nop
1c: 65 8b 05 49 02 be 7e mov %gs:0x7ebe0249(%rip),%eax # 0x7ebe026c
23: 89 c1 mov %eax,%ecx
25: 48 8b 34 24 mov (%rsp),%rsi
* 29: 81 e1 00 01 00 00 and $0x100,%ecx <-- trapping instruction
2f: 65 48 8b 14 25 c0 6e mov %gs:0x26ec0,%rdx
36: 02 00
38: a9 00 01 ff 00 test $0xff0100,%eax
3d: 74 0e je 0x4d