loop4: detected capacity change from 0 to 1280
loop4: detected capacity change from 0 to 16383
------------[ cut here ]------------
kernfs_put: syz0/pids.events: released with incorrect active_ref 0
WARNING: CPU: 0 PID: 10557 at fs/kernfs/dir.c:531 kernfs_put.part.0+0x433/0x540
Modules linked in:
CPU: 0 PID: 10557 Comm: kworker/0:2 Not tainted 5.19.0-rc5-next-20220705 #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 73 0b a7 ff 48 8b 14 24 44 89 f1 4c 89 fe 48 c7 c7 e0 58 72 84 e8 93 ac 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:ffff88801ac17bd8 EFLAGS: 00010286
RAX: 0000000000000000 RBX: dffffc0000000000 RCX: 0000000000000000
RDX: ffff888045659ac0 RSI: ffffffff812bd348 RDI: ffffed1003582f6d
RBP: ffff8880205b1120 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000080000000 R11: 0000000000000001 R12: ffff8880205b10e8
------------[ cut here ]------------
R13: ffff88800e42dcb0 R14: 0000000000000000 R15: ffff88800dbb7370
FS: 0000000000000000(0000) GS:ffff88806ce00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2e022000 CR3: 00000000181d6000 CR4: 0000000000350ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
WARNING: CPU: 1 PID: 13107 at fs/kernfs/dir.c:504 kernfs_get.part.0+0x69/0x80
DR3: 0000000000000000 DR6: 00000000ffff4ff0 DR7: 0000000000000400
Modules linked in:
CPU: 1 PID: 13107 Comm: systemd-udevd Not tainted 5.19.0-rc5-next-20220705 #1
Call Trace:
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
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
kernfs_put+0x42/0x50
RSP: 0018:ffff88806cf09c80 EFLAGS: 00010046
kernfs_notify_workfn+0x417/0x560
RAX: 0000000000000000 RBX: ffff8880205b10e8 RCX: 0000000000000100
RDX: ffff888045cc9ac0 RSI: ffffffff819de5c9 RDI: 0000000000000005
RBP: 0000000000000000 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000001
process_one_work+0xa0f/0x1690
R13: 1ffffffff0a01e40 R14: ffff8880205b10e8 R15: ffff888042ed0130
FS: 00007fb4ee2638c0(0000) GS:ffff88806cf00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000556f5dccbb00 CR3: 00000000493f8000 CR4: 0000000000350ee0
worker_thread+0x637/0x1250
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff4ff0 DR7: 0000000000000400
Call Trace:
kthread+0x2ed/0x3a0
kernfs_get+0x1b/0x30
kernfs_notify+0x180/0x350
ret_from_fork+0x22/0x30
cgroup_file_notify+0xf5/0x1a0
irq event stamp: 516707
call_timer_fn+0x17d/0x5f0
hardirqs last enabled at (516717): [] asm_sysvec_apic_timer_interrupt+0x1b/0x20
hardirqs last disabled at (516724): [] console_emit_next_record.constprop.0+0x667/0x800
softirqs last enabled at (515612): [] __irq_exit_rcu+0x113/0x170
softirqs last disabled at (515603): [] __irq_exit_rcu+0x113/0x170
---[ end trace 0000000000000000 ]---
==================================================================
BUG: KASAN: use-after-free in llist_del_first+0x89/0xa0
__run_timers.part.0+0x65e/0xa50
Read of size 8 at addr ffff8880205b1168 by task kworker/0:2/10557
CPU: 0 PID: 10557 Comm: kworker/0:2 Tainted: G W 5.19.0-rc5-next-20220705 #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
run_timer_softirq+0xae/0x1a0
print_report.cold+0x5e/0x5e1
__do_softirq+0x1c8/0x8cc
__irq_exit_rcu+0x113/0x170
kasan_report+0xb1/0x1b0
irq_exit_rcu+0x5/0x20
sysvec_apic_timer_interrupt+0x8e/0xc0
llist_del_first+0x89/0xa0
kernfs_notify_workfn+0x78/0x560
asm_sysvec_apic_timer_interrupt+0x1b/0x20
RIP: 0010:mod_objcg_state+0x3af/0x9e0
Code: 00 00 49 c7 44 24 28 00 00 00 00 48 c7 c6 c7 2f 7a 81 4c 89 e7 e8 c1 3e af ff 48 83 3c 24 00 74 06 e8 05 93 d1 ff fb 4d 85 ff <0f> 84 95 00 00 00 48 83 c4 28 4c 89 ff 5b 5d 41 5c 41 5d 41 5e 41
process_one_work+0xa0f/0x1690
RSP: 0018:ffff88804382fda8 EFLAGS: 00000246
RAX: 0000000000008707 RBX: ffff88806cf34ba0 RCX: 1ffffffff0b1ceb1
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
worker_thread+0x637/0x1250
RBP: ffff88806cf34bc8 R08: 0000000000000001 R09: 0000000000000001
R10: 0000000000000001 R11: 0000000000000001 R12: ffff88806cf34ba0
kthread+0x2ed/0x3a0
R13: ffff88807ffdc000 R14: 0000000000000006 R15: 0000000000000000
ret_from_fork+0x22/0x30
kmem_cache_free+0x4c4/0x600
Allocated by task 294:
__put_cred+0x12e/0x180
kasan_save_stack+0x1e/0x40
revert_creds+0xaf/0xd0
__kasan_slab_alloc+0x66/0x80
do_faccessat+0x2e7/0x810
kmem_cache_alloc+0x1b1/0x490
__kernfs_new_node+0xd4/0x8b0
kernfs_new_node+0x93/0x120
do_syscall_64+0x3b/0x90
__kernfs_create_file+0x51/0x350
entry_SYSCALL_64_after_hwframe+0x46/0xb0
cgroup_addrm_files+0x3e2/0x9d0
RIP: 0033:0x7fb4ee712ff7
css_populate_dir+0x19b/0x450
Code: 77 01 c3 48 8b 15 99 ee 0c 00 f7 d8 64 89 02 48 c7 c0 ff ff ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 b8 15 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 01 c3 48 8b 15 69 ee 0c 00 f7 d8 64 89 02 b8
cgroup_apply_control_enable+0x3ae/0xa40
RSP: 002b:00007ffe0ec91f88 EFLAGS: 00000246
cgroup_mkdir+0x824/0x11f0
ORIG_RAX: 0000000000000015
kernfs_iop_mkdir+0x149/0x1d0
RAX: ffffffffffffffda RBX: 0000556f5dcb3450 RCX: 00007fb4ee712ff7
vfs_mkdir+0x417/0x6a0
RDX: 000000000000000c RSI: 0000000000000000 RDI: 00007ffe0ec91f90
do_mkdirat+0x17b/0x2e0
RBP: 00007ffe0ec91ff0 R08: 0000556f5bafb7e0 R09: 0073656369766564
__x64_sys_mkdir+0xf2/0x140
R10: 0000000000000000 R11: 0000000000000246 R12: 0000556f5dca4a20
do_syscall_64+0x3b/0x90
R13: 00007ffe0ec91f90 R14: 0000556f5dc7bd36 R15: 0000556f5dcb0b10
entry_SYSCALL_64_after_hwframe+0x46/0xb0
Freed by task 10557:
irq event stamp: 34573
kasan_save_stack+0x1e/0x40
hardirqs last enabled at (34572): [] _raw_spin_unlock_irq+0x1f/0x40
kasan_set_track+0x21/0x30
hardirqs last disabled at (34573): [] _raw_spin_lock_irqsave+0x4e/0x50
kasan_set_free_info+0x20/0x30
softirqs last enabled at (34540): [] __irq_exit_rcu+0x113/0x170
__kasan_slab_free+0x108/0x190
softirqs last disabled at (34569): [] __irq_exit_rcu+0x113/0x170
kmem_cache_free+0xfb/0x600
---[ end trace 0000000000000000 ]---
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 ffff8880205b10e8
which belongs to the cache kernfs_node_cache of size 168
The buggy address is located 128 bytes inside of
168-byte region [ffff8880205b10e8, ffff8880205b1190)
The buggy address belongs to the physical page:
page:000000001996d544 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x205b1
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:
ffff8880205b1000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
ffff8880205b1080: 00 00 00 00 00 fc fc fc fc fc fc fc fc fa fb fb
>ffff8880205b1100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff8880205b1180: fb fb fc fc fc fc fc fc fc fc 00 00 00 00 00 00
ffff8880205b1200: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 fc
==================================================================
kmemleak: 96 new suspected memory leaks (see /sys/kernel/debug/kmemleak)
----------------
Code disassembly (best guess):
0: 00 00 add %al,(%rax)
2: 49 c7 44 24 28 00 00 movq $0x0,0x28(%r12)
9: 00 00
b: 48 c7 c6 c7 2f 7a 81 mov $0xffffffff817a2fc7,%rsi
12: 4c 89 e7 mov %r12,%rdi
15: e8 c1 3e af ff callq 0xffaf3edb
1a: 48 83 3c 24 00 cmpq $0x0,(%rsp)
1f: 74 06 je 0x27
21: e8 05 93 d1 ff callq 0xffd1932b
26: fb sti
27: 4d 85 ff test %r15,%r15
* 2a: 0f 84 95 00 00 00 je 0xc5 <-- trapping instruction
30: 48 83 c4 28 add $0x28,%rsp
34: 4c 89 ff mov %r15,%rdi
37: 5b pop %rbx
38: 5d pop %rbp
39: 41 5c pop %r12
3b: 41 5d pop %r13
3d: 41 5e pop %r14
3f: 41 rex.B