------------[ cut here ]------------
kernfs_put: syz4/pids.events: released with incorrect active_ref 0
WARNING: CPU: 1 PID: 20 at fs/kernfs/dir.c:531 kernfs_put.part.0+0x433/0x540
Modules linked in:
CPU: 1 PID: 20 Comm: kworker/1:0 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
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 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
RSP: 0018:ffff8880082c7bd8 EFLAGS: 00010286
RAX: 0000000000000000 RBX: dffffc0000000000 RCX: 0000000000000000
RDX: ffff8880082b8000 RSI: ffffffff812b6848 RDI: ffffed1001058f6d
RBP: ffff888036a1a778 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000001 R12: ffff888036a1a740
R13: ffff888037342828 R14: 0000000000000000 R15: ffff888008d4d4d8
FS: 0000000000000000(0000) GS:ffff88806cf00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f5ace4a97e0 CR3: 000000000d79e000 CR4: 0000000000350ee0
------------[ cut here ]------------
WARNING: CPU: 1 PID: 20 at fs/kernfs/dir.c:504 kernfs_get.part.0+0x69/0x80
Modules linked in:
CPU: 1 PID: 20 Comm: kworker/1:0 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
Workqueue: events kernfs_notify_workfn
RIP: 0010:kernfs_get.part.0+0x69/0x80
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:ffff88806cf09c80 EFLAGS: 00010046
RAX: 0000000000000000 RBX: ffff888036a1a740 RCX: 0000000000000100
RDX: ffff8880082b8000 RSI: ffffffff819d2579 RDI: 0000000000000005
RBP: 0000000000000000 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000001
R13: 1ffffffff0a01e40 R14: ffff888036a1a740 R15: ffff88800de8e930
FS: 0000000000000000(0000) GS:ffff88806cf00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f5ace4a97e0 CR3: 000000000d79e000 CR4: 0000000000350ee0
Call Trace:
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:desc_read+0x306/0x370
Code: 4c 89 e7 e8 dc 6d 4b 00 e9 87 fd ff ff 48 89 cf e8 3f 6e 4b 00 e9 29 ff ff ff e8 c5 6d 4b 00 e9 ed fe ff ff 41 be ff ff ff ff 7c ff ff ff e8 c0 6d 4b 00 e9 30 fd ff ff 4c 89 e7 e8 b3 6d 4b
RSP: 0018:ffff8880082c73d0 EFLAGS: 00000287
RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffffff812b70b2
RDX: ffff8880082b8000 RSI: 0000000000000000 RDI: 0000000000000006
RBP: ffff8880082c7598 R08: 0000000000000006 R09: 0000000000000000
R10: 00000000ffffe000 R11: 0000000000000001 R12: ffffffff851c7f60
R13: 00000000ffffe000 R14: 00000000ffffffff R15: 80000000ffffe000
desc_read_finalized_seq+0x81/0x1c0
_prb_read_valid+0x1aa/0x6f0
prb_read_valid+0x75/0xa0
console_emit_next_record.constprop.0+0x10a/0x800
console_unlock+0x36c/0x590
vprintk_emit+0x1b9/0x550
vprintk+0x80/0x90
_printk+0xba/0xed
__show_regs.cold+0x3f4/0x481
show_regs+0x2f/0x40
__warn+0xe2/0x190
report_bug+0x1bc/0x210
handle_bug+0x3c/0x60
exc_invalid_op+0x14/0x40
asm_exc_invalid_op+0x1b/0x20
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 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
RSP: 0018:ffff8880082c7bd8 EFLAGS: 00010286
RAX: 0000000000000000 RBX: dffffc0000000000 RCX: 0000000000000000
RDX: ffff8880082b8000 RSI: ffffffff812b6848 RDI: ffffed1001058f6d
RBP: ffff888036a1a778 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000001 R12: ffff888036a1a740
R13: ffff888037342828 R14: 0000000000000000 R15: ffff888008d4d4d8
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
irq event stamp: 904085
hardirqs last enabled at (904084): [] _raw_spin_unlock_irq+0x1f/0x40
hardirqs last disabled at (904085): [] _raw_spin_lock_irqsave+0x4e/0x50
softirqs last enabled at (903892): [] __irq_exit_rcu+0x113/0x170
softirqs last disabled at (904081): [] __irq_exit_rcu+0x113/0x170
---[ end trace 0000000000000000 ]---
Call Trace:
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
irq event stamp: 904857
hardirqs last enabled at (904867): [] __up_console_sem+0x78/0x80
hardirqs last disabled at (904878): [] __up_console_sem+0x5d/0x80
softirqs last enabled at (904616): [] __irq_exit_rcu+0x113/0x170
softirqs last disabled at (904611): [] __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 ffff888036a1a7c0 by task kworker/1:0/20
CPU: 1 PID: 20 Comm: kworker/1:0 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
------------[ cut here ]------------
llist_del_first+0x89/0xa0
kernfs_notify_workfn+0x78/0x560
process_one_work+0xa0f/0x1690
worker_thread+0x637/0x1250
WARNING: CPU: 0 PID: 294 at fs/kernfs/dir.c:504 kernfs_get.part.0+0x69/0x80
Modules linked in:
kthread+0x2ed/0x3a0
CPU: 0 PID: 294 Comm: syz-executor.1 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
Allocated by task 298:
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
kasan_save_stack+0x1e/0x40
RSP: 0018:ffff88806ce09c80 EFLAGS: 00010046
__kasan_slab_alloc+0x66/0x80
kmem_cache_alloc+0x1b1/0x490
RAX: 0000000000000000 RBX: ffff888036a1a740 RCX: 0000000000000100
__kernfs_new_node+0xd4/0x8b0
RDX: ffff888028849ac0 RSI: ffffffff819d2579 RDI: 0000000000000005
kernfs_new_node+0x93/0x120
RBP: 0000000000000000 R08: 0000000000000005 R09: 0000000000000000
__kernfs_create_file+0x51/0x350
R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000001
cgroup_addrm_files+0x3e2/0x9d0
R13: 1ffffffff0a01e40 R14: ffff888036a1a740 R15: ffff88800de8e930
css_populate_dir+0x19b/0x450
FS: 00005555566e9400(0000) GS:ffff88806ce00000(0000) knlGS:0000000000000000
cgroup_apply_control_enable+0x3ae/0xa40
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
cgroup_mkdir+0x824/0x11f0
CR2: 00007f986d178c18 CR3: 000000001d8e6000 CR4: 0000000000350ef0
kernfs_iop_mkdir+0x149/0x1d0
Call Trace:
vfs_mkdir+0x417/0x6a0
do_mkdirat+0x17b/0x2e0
kernfs_get+0x1b/0x30
__x64_sys_mkdir+0xf2/0x140
kernfs_notify+0x180/0x350
do_syscall_64+0x3b/0x90
cgroup_file_notify+0xf5/0x1a0
entry_SYSCALL_64_after_hwframe+0x46/0xb0
Freed by task 20:
call_timer_fn+0x17d/0x5f0
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
__run_timers.part.0+0x65e/0xa50
kernfs_put+0x42/0x50
kernfs_notify_workfn+0x417/0x560
process_one_work+0xa0f/0x1690
worker_thread+0x637/0x1250
run_timer_softirq+0xae/0x1a0
kthread+0x2ed/0x3a0
__do_softirq+0x1c8/0x8cc
ret_from_fork+0x22/0x30
__irq_exit_rcu+0x113/0x170
The buggy address belongs to the object at ffff888036a1a740
which belongs to the cache kernfs_node_cache of size 168
irq_exit_rcu+0x5/0x20
The buggy address is located 128 bytes inside of
168-byte region [ffff888036a1a740, ffff888036a1a7e8)
sysvec_apic_timer_interrupt+0x8e/0xc0
The buggy address belongs to the physical page:
page:00000000c6e09979 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x36a1a
flags: 0x100000000000200(slab|node=0|zone=1)
asm_sysvec_apic_timer_interrupt+0x1b/0x20
raw: 0100000000000200 0000000000000000 dead000000000122 ffff8880080718c0
RIP: 0010:lock_acquire+0x1db/0x530
raw: 0000000000000000 0000000000110011 00000001ffffffff 0000000000000000
Code: 02 b8 ff ff ff ff 65 0f c1 05 f9 6a d9 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
page dumped because: kasan: bad access detected
RSP: 0018:ffff88802886f2d8 EFLAGS: 00000206
Memory state around the buggy address:
ffff888036a1a680: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
ffff888036a1a700: fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb
RAX: dffffc0000000000 RBX: 1ffff1100510de5d RCX: 00000000858c0e1b
>ffff888036a1a780: fb fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc
RDX: 1ffff11005109486 RSI: 0000000000000000 RDI: 0000000000000000
^
ffff888036a1a800: fc fc fc fc fc 00 00 00 00 00 00 00 00 00 00 00
RBP: 0000000000000000 R08: 0000000000000000 R09: ffffffff86a5c7c7
ffff888036a1a880: 00 00 00 00 00 00 00 00 00 00 fc fc fc fc fc fc
R10: fffffbfff0d4b8f8 R11: 0000000000000001 R12: 0000000000000002
==================================================================
R13: 0000000000000000 R14: ffffffff852049a0 R15: 0000000000000000
__is_insn_slot_addr+0x3d/0x250
kernel_text_address+0x40/0xb0
__kernel_text_address+0x9/0x30
unwind_get_return_address+0x51/0x90
arch_stack_walk+0x99/0xf0
stack_trace_save+0x8c/0xc0
kasan_save_stack+0x1e/0x40
__kasan_slab_alloc+0x66/0x80
kmem_cache_alloc+0x1b1/0x490
__create_object.isra.0+0x3d/0xc10
__kmalloc_node+0x278/0x480
kvmalloc_node+0x41/0x1e0
xt_replace_table+0x1d0/0x810
__do_replace+0x1d7/0x860
do_ip6t_set_ctl+0x88c/0xaf0
nf_setsockopt+0x8b/0xf0
ipv6_setsockopt+0x122/0x190
tcp_setsockopt+0x139/0x26d0
__sys_setsockopt+0x180/0x2a0
__x64_sys_setsockopt+0xba/0x150
do_syscall_64+0x3b/0x90
entry_SYSCALL_64_after_hwframe+0x46/0xb0
RIP: 0033:0x7f986d09916a
Code: 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 49 89 ca b8 36 00 00 00 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:00007ffe9ce2a3e8 EFLAGS: 00000202 ORIG_RAX: 0000000000000036
RAX: ffffffffffffffda RBX: 0000000000000029 RCX: 00007f986d09916a
RDX: 0000000000000040 RSI: 0000000000000029 RDI: 0000000000000003
RBP: 00007ffe9ce2a410 R08: 00000000000003b8 R09: ffffffffffff0000
R10: 00007f986d178bc0 R11: 0000000000000202 R12: 00007ffe9ce2a470
R13: 0000000000000003 R14: 00007ffe9ce2a40c R15: 00007f986d178b60
irq event stamp: 407819
hardirqs last enabled at (407818): [] _raw_spin_unlock_irq+0x1f/0x40
hardirqs last disabled at (407819): [] _raw_spin_lock_irqsave+0x4e/0x50
softirqs last enabled at (407740): [] do_ipv6_setsockopt.constprop.0+0x10da/0x4570
softirqs last disabled at (407815): [] __irq_exit_rcu+0x113/0x170
---[ end trace 0000000000000000 ]---
kmemleak: 5 new suspected memory leaks (see /sys/kernel/debug/kmemleak)
----------------
Code disassembly (best guess):
0: 4c 89 e7 mov %r12,%rdi
3: e8 dc 6d 4b 00 callq 0x4b6de4
8: e9 87 fd ff ff jmpq 0xfffffd94
d: 48 89 cf mov %rcx,%rdi
10: e8 3f 6e 4b 00 callq 0x4b6e54
15: e9 29 ff ff ff jmpq 0xffffff43
1a: e8 c5 6d 4b 00 callq 0x4b6de4
1f: e9 ed fe ff ff jmpq 0xffffff11
24: 41 be ff ff ff ff mov $0xffffffff,%r14d
* 2a: e9 7c ff ff ff jmpq 0xffffffab <-- trapping instruction
2f: e8 c0 6d 4b 00 callq 0x4b6df4
34: e9 30 fd ff ff jmpq 0xfffffd69
39: 4c 89 e7 mov %r12,%rdi
3c: e8 .byte 0xe8
3d: b3 6d mov $0x6d,%bl
3f: 4b rex.WXB