------------[ cut here ]------------
kernfs_put: syz7/memory.events: released with incorrect active_ref 0
WARNING: CPU: 0 PID: 11478 at fs/kernfs/dir.c:531 kernfs_put.part.0+0x433/0x540
Modules linked in:
CPU: 0 PID: 11478 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
------------[ cut here ]------------
Workqueue: events kernfs_notify_workfn
WARNING: CPU: 1 PID: 12755 at fs/kernfs/dir.c:504 kernfs_get.part.0+0x69/0x80
Modules linked in:
CPU: 1 PID: 12755 Comm: syz-executor.7 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
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 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
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
RSP: 0018:ffff88806cf09c80 EFLAGS: 00010046
RAX: 0000000000000000 RBX: ffff888043078bc8 RCX: 0000000000000100
RSP: 0018:ffff888043e07bd8 EFLAGS: 00010286
RDX: ffff88803e529ac0 RSI: ffffffff819df849 RDI: 0000000000000005
RBP: 0000000000000000 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000001
R13: 1ffffffff0a01e40 R14: ffff888043078bc8 R15: ffff888043fa4490
FS: 00007f6ffcddf700(0000) GS:ffff88806cf00000(0000) knlGS:0000000000000000
RAX: 0000000000000000 RBX: dffffc0000000000 RCX: 0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
RDX: ffff8880453dd040 RSI: ffffffff812bd348 RDI: ffffed10087c0f6d
CR2: 00007f65c127d830 CR3: 0000000059d78000 CR4: 0000000000350ee0
RBP: ffff888043078c00 R08: 0000000000000005 R09: 0000000000000000
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
R10: 0000000000000000 R11: 0000000000000001 R12: ffff888043078bc8
DR3: 0000000000000000 DR6: 00000000ffff4ff0 DR7: 0000000000000400
Call Trace:
kernfs_get+0x1b/0x30
R13: ffff88803d8073a0 R14: 0000000000000000 R15: ffff88804192a280
kernfs_notify+0x180/0x350
FS: 0000000000000000(0000) GS:ffff88806ce00000(0000) knlGS:0000000000000000
cgroup_file_notify+0xf5/0x1a0
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
call_timer_fn+0x17d/0x5f0
CR2: 00007f3184779541 CR3: 000000003c19a000 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
sysvec_apic_timer_interrupt+0x8e/0xc0
process_one_work+0xa0f/0x1690
asm_sysvec_apic_timer_interrupt+0x1b/0x20
RIP: 0010:lock_acquire+0x1db/0x530
Code: 02 b8 ff ff ff ff 65 0f c1 05 f9 ff d8 7e 83 f8 01 0f 85 c4 02 00 00 48 83 7c 24 08 00 74 01 fb 48 b8 00 00 00 00 00 fc ff df <48> 01 c3 48 c7 03 00 00 00 00 48 c7 43 08 00 00 00 00 48 8b 84 24
RSP: 0018:ffff8880597073b8 EFLAGS: 00000206
RAX: dffffc0000000000 RBX: 1ffff1100b2e0e79 RCX: 00000000b08b82c0
worker_thread+0x637/0x1250
RDX: 1ffff11007ca5486 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: ffffffff86a607c7
R10: fffffbfff0d4c0f8 R11: 0000000000000001 R12: 0000000000000002
R13: 0000000000000000 R14: ffffffff852049e0 R15: 0000000000000000
kthread+0x2ed/0x3a0
xa_load+0xcb/0x290
ret_from_fork+0x22/0x30
irq event stamp: 1567147
list_lru_count_one+0x1bb/0x2e0
hardirqs last enabled at (1567155): [] console_emit_next_record.constprop.0+0x648/0x800
super_cache_count+0x152/0x2f0
do_shrink_slab+0x83/0xb00
hardirqs last disabled at (1567166): [] sysvec_apic_timer_interrupt+0xb/0xc0
softirqs last enabled at (1562594): [] __irq_exit_rcu+0x113/0x170
shrink_slab+0x3d7/0x6e0
softirqs last disabled at (1562589): [] __irq_exit_rcu+0x113/0x170
---[ end trace 0000000000000000 ]---
shrink_node+0x892/0x1d10
do_try_to_free_pages+0x3c7/0x1670
try_to_free_mem_cgroup_pages+0x304/0x880
try_charge_memcg+0x4cd/0x1440
mem_cgroup_charge_skmem+0x7c/0x1b0
sock_setsockopt+0x2080/0x34a0
__sys_setsockopt+0x258/0x2a0
__x64_sys_setsockopt+0xba/0x150
do_syscall_64+0x3b/0x90
entry_SYSCALL_64_after_hwframe+0x46/0xb0
RIP: 0033:0x7f6fff869b19
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:00007f6ffcddf188 EFLAGS: 00000246 ORIG_RAX: 0000000000000036
RAX: ffffffffffffffda RBX: 00007f6fff97cf60 RCX: 00007f6fff869b19
RDX: 0000000000000049 RSI: 0000000000000001 RDI: 0000000000000003
RBP: 00007f6fff8c3f6d R08: 0000000000000010 R09: 0000000000000000
R10: 0000000020000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fff60cd149f R14: 00007f6ffcddf300 R15: 0000000000022000
irq event stamp: 833
hardirqs last enabled at (832): [] _raw_spin_unlock_irq+0x1f/0x40
hardirqs last disabled at (833): [] _raw_spin_lock_irqsave+0x4e/0x50
softirqs last enabled at (210): [] sock_setsockopt+0x1de/0x34a0
softirqs last disabled at (829): [] __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 ffff888043078bc8 by task syz-executor.7/12755
CPU: 1 PID: 12755 Comm: syz-executor.7 Tainted: G W 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
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:lock_acquire+0x1db/0x530
Code: 02 b8 ff ff ff ff 65 0f c1 05 f9 ff d8 7e 83 f8 01 0f 85 c4 02 00 00 48 83 7c 24 08 00 74 01 fb 48 b8 00 00 00 00 00 fc ff df <48> 01 c3 48 c7 03 00 00 00 00 48 c7 43 08 00 00 00 00 48 8b 84 24
RSP: 0018:ffff8880597073b8 EFLAGS: 00000206
RAX: dffffc0000000000 RBX: 1ffff1100b2e0e79 RCX: 00000000b08b82c0
RDX: 1ffff11007ca5486 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: ffffffff86a607c7
R10: fffffbfff0d4c0f8 R11: 0000000000000001 R12: 0000000000000002
R13: 0000000000000000 R14: ffffffff852049e0 R15: 0000000000000000
xa_load+0xcb/0x290
list_lru_count_one+0x1bb/0x2e0
super_cache_count+0x152/0x2f0
do_shrink_slab+0x83/0xb00
shrink_slab+0x3d7/0x6e0
shrink_node+0x892/0x1d10
do_try_to_free_pages+0x3c7/0x1670
try_to_free_mem_cgroup_pages+0x304/0x880
try_charge_memcg+0x4cd/0x1440
mem_cgroup_charge_skmem+0x7c/0x1b0
sock_setsockopt+0x2080/0x34a0
__sys_setsockopt+0x258/0x2a0
__x64_sys_setsockopt+0xba/0x150
do_syscall_64+0x3b/0x90
entry_SYSCALL_64_after_hwframe+0x46/0xb0
RIP: 0033:0x7f6fff869b19
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:00007f6ffcddf188 EFLAGS: 00000246 ORIG_RAX: 0000000000000036
RAX: ffffffffffffffda RBX: 00007f6fff97cf60 RCX: 00007f6fff869b19
RDX: 0000000000000049 RSI: 0000000000000001 RDI: 0000000000000003
RBP: 00007f6fff8c3f6d R08: 0000000000000010 R09: 0000000000000000
R10: 0000000020000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fff60cd149f R14: 00007f6ffcddf300 R15: 0000000000022000
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 11478:
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 ffff888043078bc8
which belongs to the cache kernfs_node_cache of size 168
The buggy address is located 0 bytes inside of
168-byte region [ffff888043078bc8, ffff888043078c70)
The buggy address belongs to the physical page:
page:00000000af2f32d9 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x43078
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:
ffff888043078a80: 00 00 00 00 fc fc fc fc fc fc fc fc 00 00 00 00
ffff888043078b00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff888043078b80: 00 fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb
^
ffff888043078c00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fc fc
ffff888043078c80: fc fc fc fc fc fc 00 00 00 00 00 00 00 00 00 00
==================================================================
SELinux: unrecognized netlink message: protocol=0 nlmsg_type=0 sclass=netlink_route_socket pid=12809 comm=syz-executor.0
SELinux: unrecognized netlink message: protocol=0 nlmsg_type=0 sclass=netlink_route_socket pid=12815 comm=syz-executor.0
9pnet_fd: Insufficient options for proto=fd
----------------
Code disassembly (best guess):
0: 02 b8 ff ff ff ff add -0x1(%rax),%bh
6: 65 0f c1 05 f9 ff d8 xadd %eax,%gs:0x7ed8fff9(%rip) # 0x7ed90007
d: 7e
e: 83 f8 01 cmp $0x1,%eax
11: 0f 85 c4 02 00 00 jne 0x2db
17: 48 83 7c 24 08 00 cmpq $0x0,0x8(%rsp)
1d: 74 01 je 0x20
1f: fb sti
20: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax
27: fc ff df
* 2a: 48 01 c3 add %rax,%rbx <-- trapping instruction
2d: 48 c7 03 00 00 00 00 movq $0x0,(%rbx)
34: 48 c7 43 08 00 00 00 movq $0x0,0x8(%rbx)
3b: 00
3c: 48 rex.W
3d: 8b .byte 0x8b
3e: 84 .byte 0x84
3f: 24 .byte 0x24