audit: type=1326 audit(1656779219.886:16): auid=0 uid=0 gid=0 ses=4 subj=system_u:system_r:kernel_t:s0 pid=10999 comm="syz-executor.2" exe="/syz-executor.2" sig=31 arch=c000003e syscall=202 compat=0 ip=0x7f860cb37b19 code=0x0
------------[ cut here ]------------
kernfs_put: syz5/pids.events: released with incorrect active_ref 0
------------[ cut here ]------------
WARNING: CPU: 1 PID: 5262 at fs/kernfs/dir.c:531 kernfs_put.part.0+0x433/0x540
WARNING: CPU: 0 PID: 11170 at fs/kernfs/dir.c:504 kernfs_get.part.0+0x69/0x80
Modules linked in:
Modules linked in:
CPU: 0 PID: 11170 Comm: syz-executor.0 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
CPU: 1 PID: 5262 Comm: kworker/1:0 Not tainted 5.19.0-rc4-next-20220701 #1
RIP: 0010: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
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:ffff88806ce09c80 EFLAGS: 00010046
Workqueue: events kernfs_notify_workfn
RAX: 0000000000000000 RBX: ffff88801d3b5bc8 RCX: 0000000000000100
RDX: ffff88804590d040 RSI: ffffffff819d2579 RDI: 0000000000000005
RBP: 0000000000000000 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000001
RIP: 0010:kernfs_put.part.0+0x433/0x540
R13: 1ffffffff0a01e40 R14: ffff88801d3b5bc8 R15: ffff888043a54530
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
FS: 00007fc4ba175700(0000) GS:ffff88806ce00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
RSP: 0018:ffff888044b6fbd8 EFLAGS: 00010286
CR2: 0000001b2d925000 CR3: 0000000045998000 CR4: 0000000000350ef0
DR0: 0100000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff4ff0 DR7: 0000000000000600
Call Trace:
kernfs_get+0x1b/0x30
RAX: 0000000000000000 RBX: dffffc0000000000 RCX: 0000000000000000
kernfs_notify+0x180/0x350
RDX: ffff8880453f1ac0 RSI: ffffffff812b6848 RDI: ffffed100896df6d
cgroup_file_notify+0xf5/0x1a0
RBP: ffff88801d3b5c00 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000001 R12: ffff88801d3b5bc8
call_timer_fn+0x17d/0x5f0
R13: ffff888017431828 R14: 0000000000000000 R15: ffff888018ab31b8
FS: 0000000000000000(0000) GS:ffff88806cf00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000555556396c58 CR3: 000000004a8d4000 CR4: 0000000000350ee0
__run_timers.part.0+0x65e/0xa50
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff4ff0 DR7: 0000000000000400
Call Trace:
run_timer_softirq+0xae/0x1a0
__do_softirq+0x1c8/0x8cc
__irq_exit_rcu+0x113/0x170
kernfs_put+0x42/0x50
irq_exit_rcu+0x5/0x20
sysvec_apic_timer_interrupt+0x8e/0xc0
kernfs_notify_workfn+0x417/0x560
asm_sysvec_apic_timer_interrupt+0x1b/0x20
RIP: 0010:write_comp_data+0x0/0x90
Code: 06 be 7e 81 e2 00 01 ff 00 75 10 65 48 8b 04 25 c0 6e 02 00 48 8b 80 28 14 00 00 c3 66 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 <49> 89 f1 49 89 d2 49 89 f8 65 8b 05 c0 06 be 7e 89 c6 81 e6 00 01
RSP: 0018:ffff88804688f698 EFLAGS: 00000246
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffffff8153a7bc
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000007
process_one_work+0xa0f/0x1690
RBP: ffff8880449085c8 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000001
R13: ffff88806ce33880 R14: ffff88804688f7c0 R15: ffff8880449085c8
worker_thread+0x637/0x1250
perf_swevent_event+0x6c/0x550
kthread+0x2ed/0x3a0
perf_tp_event+0x2e5/0xbc0
ret_from_fork+0x22/0x30
irq event stamp: 367629
hardirqs last enabled at (367641): [] asm_sysvec_apic_timer_interrupt+0x1b/0x20
hardirqs last disabled at (367650): [] sysvec_apic_timer_interrupt+0xb/0xc0
perf_trace_run_bpf_submit+0xf5/0x1d0
softirqs last enabled at (365864): [] __irq_exit_rcu+0x113/0x170
perf_trace_lock+0x308/0x560
softirqs last disabled at (365855): [] __irq_exit_rcu+0x113/0x170
---[ end trace 0000000000000000 ]---
==================================================================
BUG: KASAN: use-after-free in llist_del_first+0x89/0xa0
Read of size 8 at addr ffff88801d3b5c48 by task kworker/1:0/5262
CPU: 1 PID: 5262 Comm: kworker/1:0 Tainted: G W 5.19.0-rc4-next-20220701 #1
lock_release+0x4aa/0x750
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:
_raw_spin_unlock+0x12/0x40
dump_stack_lvl+0x8b/0xb3
futex_wait_queue+0x83/0x3b0
print_report.cold+0x5e/0x5e1
futex_wait+0x28e/0x690
kasan_report+0xb1/0x1b0
llist_del_first+0x89/0xa0
kernfs_notify_workfn+0x78/0x560
do_futex+0x2fb/0x380
process_one_work+0xa0f/0x1690
__x64_sys_futex+0x1c6/0x4c0
worker_thread+0x637/0x1250
do_syscall_64+0x3b/0x90
entry_SYSCALL_64_after_hwframe+0x46/0xb0
kthread+0x2ed/0x3a0
RIP: 0033:0x7fc4bcc62b19
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
ret_from_fork+0x22/0x30
RSP: 002b:00007fc4ba175218 EFLAGS: 00000246
ORIG_RAX: 00000000000000ca
RAX: ffffffffffffffda RBX: 00007fc4bcd761a8 RCX: 00007fc4bcc62b19
Allocated by task 300:
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007fc4bcd761a8
kasan_save_stack+0x1e/0x40
RBP: 00007fc4bcd761a0 R08: 0000000000000000 R09: 0000000000000000
__kasan_slab_alloc+0x66/0x80
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fc4bcd761ac
kmem_cache_alloc+0x1b1/0x490
R13: 00007ffd9bc6027f R14: 00007fc4ba175300 R15: 0000000000022000
__kernfs_new_node+0xd4/0x8b0
kernfs_new_node+0x93/0x120
irq event stamp: 57
__kernfs_create_file+0x51/0x350
hardirqs last enabled at (56): [] _raw_spin_unlock_irq+0x1f/0x40
cgroup_addrm_files+0x3e2/0x9d0
hardirqs last disabled at (57): [] _raw_spin_lock_irqsave+0x4e/0x50
css_populate_dir+0x19b/0x450
softirqs last enabled at (0): [] copy_process+0x1dfa/0x6d60
cgroup_apply_control_enable+0x3ae/0xa40
softirqs last disabled at (53): [] __irq_exit_rcu+0x113/0x170
cgroup_mkdir+0x824/0x11f0
---[ end trace 0000000000000000 ]---
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 5262:
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
------------[ cut here ]------------
kernfs_notify_workfn+0x417/0x560
WARNING: CPU: 0 PID: 11087 at fs/kernfs/dir.c:504 kernfs_get.part.0+0x69/0x80
process_one_work+0xa0f/0x1690
Modules linked in:
worker_thread+0x637/0x1250
kthread+0x2ed/0x3a0
CPU: 0 PID: 11087 Comm: syz-executor.3 Tainted: G W 5.19.0-rc4-next-20220701 #1
ret_from_fork+0x22/0x30
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
The buggy address belongs to the object at ffff88801d3b5bc8
which belongs to the cache kernfs_node_cache of size 168
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
The buggy address is located 128 bytes inside of
168-byte region [ffff88801d3b5bc8, ffff88801d3b5c70)
RSP: 0018:ffff888017247a60 EFLAGS: 00010046
RAX: 0000000000040000 RBX: ffff88801d1aecb0 RCX: ffffc90005c4d000
The buggy address belongs to the physical page:
RDX: 0000000000040000 RSI: ffffffff819d2579 RDI: 0000000000000005
page:000000006cc501b0 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1d3b5
RBP: 0000000000000000 R08: 0000000000000005 R09: 0000000000000000
flags: 0x100000000000200(slab|node=0|zone=1)
R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000001
raw: 0100000000000200 0000000000000000 dead000000000122 ffff8880080718c0
R13: 1ffffffff0a01e40 R14: ffff88801d1aecb0 R15: ffff888044f94490
raw: 0000000000000000 0000000000110011 00000001ffffffff 0000000000000000
FS: 00007f2b388a0700(0000) GS:ffff88806ce00000(0000) knlGS:0000000000000000
page dumped because: kasan: bad access detected
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fe7c4036018 CR3: 000000004a8d4000 CR4: 0000000000350ef0
Memory state around the buggy address:
DR0: 0100000000000000 DR1: 0000000000000000 DR2: 0000000000000000
ffff88801d3b5b00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
DR3: 0000000000000000 DR6: 00000000ffff4ff0 DR7: 0000000000000600
ffff88801d3b5b80: 00 fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb
Call Trace:
>ffff88801d3b5c00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fc fc
^
kernfs_get+0x1b/0x30
ffff88801d3b5c80: fc fc fc fc fc fc 00 00 00 00 00 00 00 00 00 00
kernfs_notify+0x180/0x350
ffff88801d3b5d00: 00 00 00 00 00 00 00 00 00 00 00 fc fc fc fc fc
cgroup_file_notify+0xf5/0x1a0
==================================================================
try_charge_memcg+0x461/0x13c0
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: 0033:0x7f2b3b34bb19
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:00007f2b388a0188 EFLAGS: 00000246 ORIG_RAX: 0000000000000036
RAX: ffffffffffffffda RBX: 00007f2b3b45f020 RCX: 00007f2b3b34bb19
RDX: 0000000000000049 RSI: 0000000000000001 RDI: 0000000000000004
RBP: 00007f2b3b3a5f6d R08: 0000000000000010 R09: 0000000000000000
R10: 0000000020000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffff701772f R14: 00007f2b388a0300 R15: 0000000000022000
irq event stamp: 3728
hardirqs last enabled at (3727): [] _raw_spin_unlock_irqrestore+0x28/0x50
hardirqs last disabled at (3728): [] _raw_spin_lock_irqsave+0x4e/0x50
softirqs last enabled at (3724): [] __irq_exit_rcu+0x113/0x170
softirqs last disabled at (3715): [] __irq_exit_rcu+0x113/0x170
---[ end trace 0000000000000000 ]---
----------------
Code disassembly (best guess), 1 bytes skipped:
0: be 7e 81 e2 00 mov $0xe2817e,%esi
5: 01 ff add %edi,%edi
7: 00 75 10 add %dh,0x10(%rbp)
a: 65 48 8b 04 25 c0 6e mov %gs:0x26ec0,%rax
11: 02 00
13: 48 8b 80 28 14 00 00 mov 0x1428(%rax),%rax
1a: c3 retq
1b: 66 66 2e 0f 1f 84 00 data16 nopw %cs:0x0(%rax,%rax,1)
22: 00 00 00 00
26: 0f 1f 00 nopl (%rax)
* 29: 49 89 f1 mov %rsi,%r9 <-- trapping instruction
2c: 49 89 d2 mov %rdx,%r10
2f: 49 89 f8 mov %rdi,%r8
32: 65 8b 05 c0 06 be 7e mov %gs:0x7ebe06c0(%rip),%eax # 0x7ebe06f9
39: 89 c6 mov %eax,%esi
3b: 81 .byte 0x81
3c: e6 00 out %al,$0x0
3e: 01 .byte 0x1