------------[ cut here ]------------
kernfs_put: syz2/pids.events: released with incorrect active_ref 0
WARNING: CPU: 1 PID: 158 at fs/kernfs/dir.c:531 kernfs_put.part.0+0x433/0x540
Modules linked in:
CPU: 1 PID: 158 Comm: kworker/1:3 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
------------[ cut here ]------------
RSP: 0018:ffff88801897fbd8 EFLAGS: 00010286
WARNING: CPU: 0 PID: 5328 at fs/kernfs/dir.c:504 kernfs_get.part.0+0x69/0x80
Modules linked in:
RAX: 0000000000000000 RBX: dffffc0000000000 RCX: 0000000000000000
CPU: 0 PID: 5328 Comm: syz-executor.3 Not tainted 5.19.0-rc4-next-20220701 #1
RDX: ffff88800fab8000 RSI: ffffffff812b6848 RDI: ffffed100312ff6d
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 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
RBP: ffff88800fdcba30 R08: 0000000000000005 R09: 0000000000000000
RSP: 0018:ffff88806ce09c80 EFLAGS: 00010046
RAX: 0000000000000000 RBX: ffff88800fdcb9f8 RCX: 0000000000000100
R10: 0000000000000000 R11: 0000000000000001 R12: ffff88800fdcb9f8
RDX: ffff88800ef41ac0 RSI: ffffffff819d2579 RDI: 0000000000000005
RBP: 0000000000000000 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000001
R13: ffff888016c60658 R14: 0000000000000000 R15: ffff888016d938e8
R13: 1ffffffff0a01e40 R14: ffff88800fdcb9f8 R15: ffff888043187130
FS: 00007f0825a65700(0000) GS:ffff88806ce00000(0000) knlGS:0000000000000000
FS: 0000000000000000(0000) GS:ffff88806cf00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fec408fb000 CR3: 00000000431cc000 CR4: 0000000000350ef0
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
Call Trace:
CR2: 00005555568f3098 CR3: 00000000443a2000 CR4: 0000000000350ee0
kernfs_get+0x1b/0x30
kernfs_notify+0x180/0x350
Call Trace:
cgroup_file_notify+0xf5/0x1a0
kernfs_put+0x42/0x50
call_timer_fn+0x17d/0x5f0
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
kthread+0x2ed/0x3a0
__irq_exit_rcu+0x113/0x170
irq_exit_rcu+0x5/0x20
ret_from_fork+0x22/0x30
sysvec_apic_timer_interrupt+0x8e/0xc0
irq event stamp: 359175
asm_sysvec_apic_timer_interrupt+0x1b/0x20
hardirqs last enabled at (359185): [] asm_sysvec_apic_timer_interrupt+0x1b/0x20
RIP: 0010:unlock_page+0x2f/0x130
hardirqs last disabled at (359194): [] sysvec_apic_timer_interrupt+0xb/0xc0
Code: fd 53 e8 14 03 e8 ff 48 8d 7d 08 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 e4 00 00 00 4c 8b 65 08 <31> ff 4c 89 e3 83 e3 01 48 89 de e8 d1 ff e7 ff 48 85 db 0f 85 b8
softirqs last enabled at (358822): [] __irq_exit_rcu+0x113/0x170
RSP: 0018:ffff888048eb7868 EFLAGS: 00000246
softirqs last disabled at (358791): [] __irq_exit_rcu+0x113/0x170
RAX: dffffc0000000000 RBX: 0000000000000001 RCX: ffffc900053b9000
---[ end trace 0000000000000000 ]---
RDX: 1ffffd400019e211 RSI: ffffffff815c691c RDI: ffffea0000cf1088
RBP: ffffea0000cf1080 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000001 R12: ffffea0000c6e288
==================================================================
R13: ffff88801ab622b8 R14: ffff88801ab622b8 R15: 0000000000000000
BUG: KASAN: use-after-free in llist_del_first+0x89/0xa0
Read of size 8 at addr ffff88800fdcba78 by task kworker/1:3/158
CPU: 1 PID: 158 Comm: kworker/1:3 Tainted: G W 5.19.0-rc4-next-20220701 #1
__block_write_full_page+0x7b3/0x1190
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:
block_write_full_page+0x14d/0x190
dump_stack_lvl+0x8b/0xb3
__writepage+0x67/0x180
print_report.cold+0x5e/0x5e1
write_cache_pages+0x48c/0x1190
kasan_report+0xb1/0x1b0
llist_del_first+0x89/0xa0
kernfs_notify_workfn+0x78/0x560
generic_writepages+0xe2/0x150
process_one_work+0xa0f/0x1690
do_writepages+0x1b0/0x690
worker_thread+0x637/0x1250
kthread+0x2ed/0x3a0
ret_from_fork+0x22/0x30
Allocated by task 293:
kasan_save_stack+0x1e/0x40
filemap_fdatawrite_wbc+0x143/0x1b0
__kasan_slab_alloc+0x66/0x80
__filemap_fdatawrite_range+0xb6/0xf0
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
sync_blockdev_nowait+0x5b/0x80
css_populate_dir+0x19b/0x450
sync_filesystem.part.0+0xbb/0x1e0
cgroup_apply_control_enable+0x3ae/0xa40
__x64_sys_syncfs+0x19d/0x250
cgroup_mkdir+0x824/0x11f0
do_syscall_64+0x3b/0x90
kernfs_iop_mkdir+0x149/0x1d0
entry_SYSCALL_64_after_hwframe+0x46/0xb0
vfs_mkdir+0x417/0x6a0
RIP: 0033:0x7f08284efb19
do_mkdirat+0x17b/0x2e0
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
__x64_sys_mkdir+0xf2/0x140
RSP: 002b:00007f0825a65188 EFLAGS: 00000246
do_syscall_64+0x3b/0x90
ORIG_RAX: 0000000000000132
entry_SYSCALL_64_after_hwframe+0x46/0xb0
RAX: ffffffffffffffda RBX: 00007f0828602f60 RCX: 00007f08284efb19
Freed by task 158:
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000005
kasan_save_stack+0x1e/0x40
RBP: 00007f0828549f6d R08: 0000000000000000 R09: 0000000000000000
kasan_set_track+0x21/0x30
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
kasan_set_free_info+0x20/0x30
R13: 00007ffc6bd7965f R14: 00007f0825a65300 R15: 0000000000022000
__kasan_slab_free+0x108/0x190
kmem_cache_free+0xfb/0x600
irq event stamp: 45391
kernfs_put.part.0+0x2c7/0x540
hardirqs last enabled at (45390): [] asm_sysvec_apic_timer_interrupt+0x1b/0x20
kernfs_put+0x42/0x50
hardirqs last disabled at (45391): [] _raw_spin_lock_irqsave+0x4e/0x50
kernfs_notify_workfn+0x417/0x560
softirqs last enabled at (45060): [] __irq_exit_rcu+0x113/0x170
process_one_work+0xa0f/0x1690
softirqs last disabled at (45355): [] __irq_exit_rcu+0x113/0x170
worker_thread+0x637/0x1250
---[ end trace 0000000000000000 ]---
kthread+0x2ed/0x3a0
ret_from_fork+0x22/0x30
The buggy address belongs to the object at ffff88800fdcb9f8
which belongs to the cache kernfs_node_cache of size 168
The buggy address is located 128 bytes inside of
168-byte region [ffff88800fdcb9f8, ffff88800fdcbaa0)
The buggy address belongs to the physical page:
page:00000000f38bda74 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0xfdcb
flags: 0x100000000000200(slab|node=0|zone=1)
raw: 0100000000000200 0000000000000000 dead000000000122 ffff8880080718c0
raw: 0000000000000000 0000000000110011 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
Memory state around the buggy address:
ffff88800fdcb900: fc fc 00 00 00 00 00 00 00 00 00 00 00 00 00 00
ffff88800fdcb980: 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc fa
>ffff88800fdcba00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff88800fdcba80: fb fb fb fb fc fc fc fc fc fc fc fc 00 00 00 00
ffff88800fdcbb00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
==================================================================
netlink: 8 bytes leftover after parsing attributes in process `syz-executor.4'.
netlink: 8 bytes leftover after parsing attributes in process `syz-executor.4'.
----------------
Code disassembly (best guess):
0: fd std
1: 53 push %rbx
2: e8 14 03 e8 ff callq 0xffe8031b
7: 48 8d 7d 08 lea 0x8(%rbp),%rdi
b: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax
12: fc ff df
15: 48 89 fa mov %rdi,%rdx
18: 48 c1 ea 03 shr $0x3,%rdx
1c: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1)
20: 0f 85 e4 00 00 00 jne 0x10a
26: 4c 8b 65 08 mov 0x8(%rbp),%r12
* 2a: 31 ff xor %edi,%edi <-- trapping instruction
2c: 4c 89 e3 mov %r12,%rbx
2f: 83 e3 01 and $0x1,%ebx
32: 48 89 de mov %rbx,%rsi
35: e8 d1 ff e7 ff callq 0xffe8000b
3a: 48 85 db test %rbx,%rbx
3d: 0f .byte 0xf
3e: 85 .byte 0x85
3f: b8 .byte 0xb8