------------[ cut here ]------------
kernfs_put: syz7/pids.events: released with incorrect active_ref 0
WARNING: CPU: 0 PID: 8233 at fs/kernfs/dir.c:531 kernfs_put.part.0+0x433/0x540
Modules linked in:
CPU: 0 PID: 8233 Comm: kworker/0:1 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
------------[ cut here ]------------
RIP: 0010:kernfs_put.part.0+0x433/0x540
WARNING: CPU: 1 PID: 190 at fs/kernfs/dir.c:504 kernfs_get.part.0+0x69/0x80
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
Modules linked in:
CPU: 1 PID: 190 Comm: in:imklog Not tainted 5.19.0-rc5-next-20220705 #1
RSP: 0018:ffff8880474cfbd8 EFLAGS: 00010286
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
RAX: 0000000000000000 RBX: dffffc0000000000 RCX: 0000000000000000
RSP: 0018:ffff88806cf09c80 EFLAGS: 00010046
RDX: ffff8880445d1ac0 RSI: ffffffff812bd348 RDI: ffffed1008e99f6d
RAX: 0000000000000000 RBX: ffff8880447243a0 RCX: 0000000000000100
RBP: ffff8880447243d8 R08: 0000000000000005 R09: 0000000000000000
RDX: ffff88800f9e8000 RSI: ffffffff819de5c9 RDI: 0000000000000005
RBP: 0000000000000000 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000080000000 R11: 0000000000000001 R12: ffff8880447243a0
R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000001
R13: 1ffffffff0a01e40 R14: ffff8880447243a0 R15: ffff88800ef16130
R13: ffff88800e2aa000 R14: 0000000000000000 R15: ffff888014bc6960
FS: 00007f8c3df2b700(0000) GS:ffff88806cf00000(0000) knlGS:0000000000000000
FS: 0000000000000000(0000) GS:ffff88806ce00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f2916016000 CR3: 000000001a71e000 CR4: 0000000000350ee0
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff4ff0 DR7: 0000000000000400
CR2: 0000555556bc5c58 CR3: 00000000435d4000 CR4: 0000000000350ef0
Call Trace:
kernfs_get+0x1b/0x30
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
kernfs_notify+0x180/0x350
DR3: 0000000000000000 DR6: 00000000ffff4ff0 DR7: 0000000000000400
cgroup_file_notify+0xf5/0x1a0
Call Trace:
call_timer_fn+0x17d/0x5f0
kernfs_put+0x42/0x50
kernfs_notify_workfn+0x417/0x560
process_one_work+0xa0f/0x1690
__run_timers.part.0+0x65e/0xa50
worker_thread+0x637/0x1250
run_timer_softirq+0xae/0x1a0
__do_softirq+0x1c8/0x8cc
__irq_exit_rcu+0x113/0x170
kthread+0x2ed/0x3a0
irq_exit_rcu+0x5/0x20
sysvec_apic_timer_interrupt+0x8e/0xc0
ret_from_fork+0x22/0x30
asm_sysvec_apic_timer_interrupt+0x1b/0x20
RIP: 0010:finish_task_switch.isra.0+0x23a/0x8a0
irq event stamp: 598363
Code: 89 f7 48 c7 03 00 00 00 00 e8 a2 54 20 03 4d 85 e4 75 ba 4c 89 f7 e8 b5 29 fc 02 e8 40 df 2b 00 fb 65 48 8b 1c 25 c0 6e 02 00 <48> 8d bb 10 14 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1
hardirqs last enabled at (598373): [] console_emit_next_record.constprop.0+0x648/0x800
RSP: 0018:ffff88801a74f958 EFLAGS: 00000206
hardirqs last disabled at (598382): [] console_emit_next_record.constprop.0+0x667/0x800
RAX: 000000000000613f RBX: ffff88800f9e8000 RCX: ffffffff8128d13f
softirqs last enabled at (596778): [] __irq_exit_rcu+0x113/0x170
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
softirqs last disabled at (596763): [] __irq_exit_rcu+0x113/0x170
RBP: ffff88801a74f998 R08: 0000000000000001 R09: ffffffff86a5e847
R10: fffffbfff0d4bd08 R11: 0000000000000001 R12: ffff88806cf37cd8
---[ end trace 0000000000000000 ]---
R13: ffff88801ad09ac0 R14: ffff88806cf37cc0 R15: ffff88806cf386b8
__schedule+0x89b/0x24a0
schedule+0xd2/0x1f0
syslog_print+0x1c2/0x590
do_syslog.part.0+0x272/0x6a0
do_syslog+0x49/0x60
kmsg_read+0x8a/0xb0
proc_reg_read+0x11c/0x300
vfs_read+0x1ea/0x5d0
ksys_read+0x127/0x250
do_syscall_64+0x3b/0x90
entry_SYSCALL_64_after_hwframe+0x46/0xb0
RIP: 0033:0x7f8c3e96e08c
Code: ec 28 48 89 54 24 18 48 89 74 24 10 89 7c 24 08 e8 89 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 bf fc ff ff 48
RSP: 002b:00007f8c3df0a4d0 EFLAGS: 00000246 ORIG_RAX: 0000000000000000
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f8c3e96e08c
RDX: 0000000000001fa0 RSI: 00007f8c3df0ad00 RDI: 0000000000000005
RBP: 000055f9079604c0 R08: 0000000000000000 R09: 000055f90795ce88
R10: 00007f8c38017470 R11: 0000000000000246 R12: 00007f8c3df0ad00
R13: 0000000000001fa0 R14: 00007f8c3df0ad00 R15: 00007f8c3df0aef5
irq event stamp: 24901
hardirqs last enabled at (24900): [] _raw_spin_unlock_irq+0x1f/0x40
hardirqs last disabled at (24901): [] _raw_spin_lock_irqsave+0x4e/0x50
softirqs last enabled at (23928): [] __irq_exit_rcu+0x113/0x170
softirqs last disabled at (24897): [] __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 ffff8880447243a0 by task in:imklog/190
CPU: 1 PID: 190 Comm: in:imklog 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
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:finish_task_switch.isra.0+0x23a/0x8a0
Code: 89 f7 48 c7 03 00 00 00 00 e8 a2 54 20 03 4d 85 e4 75 ba 4c 89 f7 e8 b5 29 fc 02 e8 40 df 2b 00 fb 65 48 8b 1c 25 c0 6e 02 00 <48> 8d bb 10 14 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1
RSP: 0018:ffff88801a74f958 EFLAGS: 00000206
RAX: 000000000000613f RBX: ffff88800f9e8000 RCX: ffffffff8128d13f
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffff88801a74f998 R08: 0000000000000001 R09: ffffffff86a5e847
R10: fffffbfff0d4bd08 R11: 0000000000000001 R12: ffff88806cf37cd8
R13: ffff88801ad09ac0 R14: ffff88806cf37cc0 R15: ffff88806cf386b8
__schedule+0x89b/0x24a0
schedule+0xd2/0x1f0
syslog_print+0x1c2/0x590
do_syslog.part.0+0x272/0x6a0
do_syslog+0x49/0x60
kmsg_read+0x8a/0xb0
proc_reg_read+0x11c/0x300
vfs_read+0x1ea/0x5d0
ksys_read+0x127/0x250
do_syscall_64+0x3b/0x90
entry_SYSCALL_64_after_hwframe+0x46/0xb0
RIP: 0033:0x7f8c3e96e08c
Code: ec 28 48 89 54 24 18 48 89 74 24 10 89 7c 24 08 e8 89 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 bf fc ff ff 48
RSP: 002b:00007f8c3df0a4d0 EFLAGS: 00000246 ORIG_RAX: 0000000000000000
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f8c3e96e08c
RDX: 0000000000001fa0 RSI: 00007f8c3df0ad00 RDI: 0000000000000005
RBP: 000055f9079604c0 R08: 0000000000000000 R09: 000055f90795ce88
R10: 00007f8c38017470 R11: 0000000000000246 R12: 00007f8c3df0ad00
R13: 0000000000001fa0 R14: 00007f8c3df0ad00 R15: 00007f8c3df0aef5
Allocated by task 292:
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 8233:
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 ffff8880447243a0
which belongs to the cache kernfs_node_cache of size 168
The buggy address is located 0 bytes inside of
168-byte region [ffff8880447243a0, ffff888044724448)
The buggy address belongs to the physical page:
page:000000000203bb6c refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x44724
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:
ffff888044724280: fc fc fc fc fc fc fc 00 00 00 00 00 00 00 00 00
ffff888044724300: 00 00 00 00 00 00 00 00 00 00 00 00 fc fc fc fc
>ffff888044724380: fc fc fc fc fa fb fb fb fb fb fb fb fb fb fb fb
^
ffff888044724400: fb fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc
ffff888044724480: fc 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
==================================================================
platform regulatory.0: Direct firmware load for regulatory.db failed with error -2
----------------
Code disassembly (best guess):
0: 89 f7 mov %esi,%edi
2: 48 c7 03 00 00 00 00 movq $0x0,(%rbx)
9: e8 a2 54 20 03 callq 0x32054b0
e: 4d 85 e4 test %r12,%r12
11: 75 ba jne 0xffffffcd
13: 4c 89 f7 mov %r14,%rdi
16: e8 b5 29 fc 02 callq 0x2fc29d0
1b: e8 40 df 2b 00 callq 0x2bdf60
20: fb sti
21: 65 48 8b 1c 25 c0 6e mov %gs:0x26ec0,%rbx
28: 02 00
* 2a: 48 8d bb 10 14 00 00 lea 0x1410(%rbx),%rdi <-- trapping instruction
31: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax
38: fc ff df
3b: 48 89 fa mov %rdi,%rdx
3e: 48 rex.W
3f: c1 .byte 0xc1