------------[ cut here ]------------
kernfs_put: syz0/memory.events: released with incorrect active_ref 0
WARNING: CPU: 0 PID: 6 at fs/kernfs/dir.c:531 kernfs_put.part.0+0x433/0x540
Modules linked in:
CPU: 0 PID: 6 Comm: kworker/0:0 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:ffff888008217bd8 EFLAGS: 00010286
RAX: 0000000000000000 RBX: dffffc0000000000 RCX: 0000000000000000
RDX: ffff888008201ac0 RSI: ffffffff812b6848 RDI: ffffed1001042f6d
RBP: ffff88800d768eb8 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000001 R12: ffff88800d768e80
R13: ffff888019652658 R14: 0000000000000000 R15: ffff88800a736050
FS: 0000000000000000(0000) GS:ffff88806ce00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fa90c2082a0 CR3: 000000000e7b0000 CR4: 0000000000350ef0
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: 29343
hardirqs last enabled at (29355): [] __up_console_sem+0x78/0x80
hardirqs last disabled at (29366): [] __up_console_sem+0x5d/0x80
softirqs last enabled at (29160): [] __irq_exit_rcu+0x113/0x170
softirqs last disabled at (29137): [] __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 ffff88800d768f00 by task kworker/0:0/6
CPU: 0 PID: 6 Comm: kworker/0:0 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
llist_del_first+0x89/0xa0
kernfs_notify_workfn+0x78/0x560
process_one_work+0xa0f/0x1690
worker_thread+0x637/0x1250
kthread+0x2ed/0x3a0
ret_from_fork+0x22/0x30
Allocated by task 297:
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 6:
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 ffff88800d768e80
which belongs to the cache kernfs_node_cache of size 168
The buggy address is located 128 bytes inside of
168-byte region [ffff88800d768e80, ffff88800d768f28)
The buggy address belongs to the physical page:
page:0000000076b736b5 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0xd768
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:
ffff88800d768e00: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc
ffff88800d768e80: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff88800d768f00: fb fb fb fb fb fc fc fc fc fc fc fc fc fc fc fc
^
ffff88800d768f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff88800d769000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
==================================================================
loop1: detected capacity change from 0 to 40
FAT-fs (loop1): Directory bread(block 24) failed
FAT-fs (loop1): Directory bread(block 25) failed
FAT-fs (loop1): Directory bread(block 26) failed
FAT-fs (loop1): Directory bread(block 27) failed
FAT-fs (loop1): Directory bread(block 28) failed
FAT-fs (loop1): Directory bread(block 29) failed
FAT-fs (loop1): Directory bread(block 30) failed
FAT-fs (loop1): Directory bread(block 31) failed
FAT-fs (loop1): Directory bread(block 32) failed
FAT-fs (loop1): Directory bread(block 33) failed
random: crng reseeded on system resumption
Restarting kernel threads ... done.
EXT4-fs (loop7): mounted filesystem without journal. Quota mode: writeback.
raw_sendmsg: syz-executor.6 forgot to set AF_INET. Fix it!
syz-executor.6 (4012) used greatest stack depth: 24472 bytes left
BUG: unable to handle page fault for address: ffffebde2f6e8188
#PF: supervisor read access in kernel mode
#PF: error_code(0x0000) - not-present page
PGD 0 P4D 0
Oops: 0000 [#1] PREEMPT SMP KASAN NOPTI
CPU: 1 PID: 84 Comm: kworker/1:3 Tainted: G B 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_freezable_power_ disk_events_workfn
RIP: 0010:qlist_free_all+0xaf/0x190
Code: 80 4c 01 c2 0f 82 f0 00 00 00 48 c7 c0 00 00 00 80 48 2b 05 53 36 7c 03 48 01 d0 48 c1 e8 0c 48 c1 e0 06 48 03 05 31 36 7c 03 <48> 8b 48 08 48 89 c2 f6 c1 01 0f 85 b6 00 00 00 0f 1f 44 00 00 48
RSP: 0018:ffff88800f95f9a8 EFLAGS: 00010282
RAX: ffffebde2f6e8180 RBX: 0000000bdba0663b RCX: 1ffffffff0b1d44d
RDX: 0000000c5ba0663b RSI: 0000000000000008 RDI: ffffffff81764e81
RBP: 0000000000000000 R08: 0000000bdba0663b R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000001 R12: dffffc0000000000
R13: ffff88800f95f9e8 R14: 0000000000000000 R15: ffff88800c459660
FS: 0000000000000000(0000) GS:ffff88806cf00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffebde2f6e8188 CR3: 000000000edba000 CR4: 0000000000350ee0
Call Trace:
kasan_quarantine_reduce+0x180/0x200
__kasan_slab_alloc+0x78/0x80
__kmalloc+0x1be/0x440
bio_kmalloc+0x3a/0x60
blk_rq_map_kern+0x49d/0x920
__scsi_execute+0x4a3/0x5d0
sr_check_events+0x17a/0xa30
cdrom_check_events+0x64/0x110
sr_block_check_events+0xbf/0xf0
disk_check_events+0xc7/0x420
process_one_work+0xa0f/0x1690
worker_thread+0x637/0x1250
kthread+0x2ed/0x3a0
ret_from_fork+0x22/0x30
Modules linked in:
CR2: ffffebde2f6e8188
---[ end trace 0000000000000000 ]---
RIP: 0010:qlist_free_all+0xaf/0x190
Code: 80 4c 01 c2 0f 82 f0 00 00 00 48 c7 c0 00 00 00 80 48 2b 05 53 36 7c 03 48 01 d0 48 c1 e8 0c 48 c1 e0 06 48 03 05 31 36 7c 03 <48> 8b 48 08 48 89 c2 f6 c1 01 0f 85 b6 00 00 00 0f 1f 44 00 00 48
RSP: 0018:ffff88800f95f9a8 EFLAGS: 00010282
RAX: ffffebde2f6e8180 RBX: 0000000bdba0663b RCX: 1ffffffff0b1d44d
RDX: 0000000c5ba0663b RSI: 0000000000000008 RDI: ffffffff81764e81
RBP: 0000000000000000 R08: 0000000bdba0663b R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000001 R12: dffffc0000000000
R13: ffff88800f95f9e8 R14: 0000000000000000 R15: ffff88800c459660
FS: 0000000000000000(0000) GS:ffff88806cf00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffebde2f6e8188 CR3: 000000000edba000 CR4: 0000000000350ee0
----------------
Code disassembly (best guess), 1 bytes skipped:
0: 4c 01 c2 add %r8,%rdx
3: 0f 82 f0 00 00 00 jb 0xf9
9: 48 c7 c0 00 00 00 80 mov $0xffffffff80000000,%rax
10: 48 2b 05 53 36 7c 03 sub 0x37c3653(%rip),%rax # 0x37c366a
17: 48 01 d0 add %rdx,%rax
1a: 48 c1 e8 0c shr $0xc,%rax
1e: 48 c1 e0 06 shl $0x6,%rax
22: 48 03 05 31 36 7c 03 add 0x37c3631(%rip),%rax # 0x37c365a
* 29: 48 8b 48 08 mov 0x8(%rax),%rcx <-- trapping instruction
2d: 48 89 c2 mov %rax,%rdx
30: f6 c1 01 test $0x1,%cl
33: 0f 85 b6 00 00 00 jne 0xef
39: 0f 1f 44 00 00 nopl 0x0(%rax,%rax,1)
3e: 48 rex.W