------------[ cut here ]------------
kernfs_put: syz7/memory.events: released with incorrect active_ref 0
WARNING: CPU: 0 PID: 12 at fs/kernfs/dir.c:531 kernfs_put.part.0+0x433/0x540
Modules linked in:
CPU: 0 PID: 12 Comm: kworker/0:1 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
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 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
RSP: 0018:ffff88800824fbd8 EFLAGS: 00010286
RAX: 0000000000000000 RBX: dffffc0000000000 RCX: 0000000000000000
RDX: ffff88800822d040 RSI: ffffffff812bd348 RDI: ffffed1001049f6d
RBP: ffff88803fbb54c0 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000001 R12: ffff88803fbb5488
R13: ffff88801d59cbc8 R14: 0000000000000000 R15: ffff88801824d208
FS: 0000000000000000(0000) GS:ffff88806ce00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020056000 CR3: 000000000db3c000 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: 150489
hardirqs last enabled at (150499): [] __up_console_sem+0x78/0x80
hardirqs last disabled at (150512): [] __up_console_sem+0x5d/0x80
softirqs last enabled at (150148): [] __irq_exit_rcu+0x113/0x170
softirqs last disabled at (150141): [] __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 ffff88803fbb5508 by task kworker/0:1/12
CPU: 0 PID: 12 Comm: kworker/0:1 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
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 294:
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 12:
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 ffff88803fbb5488
which belongs to the cache kernfs_node_cache of size 168
The buggy address is located 128 bytes inside of
168-byte region [ffff88803fbb5488, ffff88803fbb5530)
The buggy address belongs to the physical page:
page:0000000015558897 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x3fbb5
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:
ffff88803fbb5400: 00 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc
ffff88803fbb5480: fc fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff88803fbb5500: fb fb fb fb fb fb fc fc fc fc fc fc fc fc 00 00
^
ffff88803fbb5580: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
ffff88803fbb5600: 00 00 00 fc fc fc fc fc fc fc fc 00 00 00 00 00
==================================================================
loop0: detected capacity change from 0 to 106
loop6: detected capacity change from 0 to 106
BUG: kernel NULL pointer dereference, address: 0000000000000018
#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: 0 PID: 3671 Comm: systemd-udevd Tainted: G B 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
RIP: 0010:qlist_free_all+0xd3/0x190
Code: 03 05 a1 76 7b 03 48 8b 48 08 48 89 c2 f6 c1 01 0f 85 b6 00 00 00 0f 1f 44 00 00 48 8b 02 f6 c4 02 b8 00 00 00 00 48 0f 44 d0 <4c> 8b 72 18 e9 50 ff ff ff 49 83 7e 48 00 0f 85 68 ff ff ff 41 f7
RSP: 0018:ffff88801b727c70 EFLAGS: 00010246
RAX: 0000000000000000 RBX: ffff88801e033f70 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000001 RDI: ffffffff81771eb1
RBP: 0000000000000000 R08: ffff88801e033f70 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000001 R12: dffffc0000000000
R13: ffff88801b727cb0 R14: 0000000000000000 R15: ffff88803fbb5488
FS: 00007fe501c7b8c0(0000) GS:ffff88806ce00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000018 CR3: 000000003f886000 CR4: 0000000000350ef0
Call Trace:
kasan_quarantine_reduce+0x180/0x200
__kasan_slab_alloc+0x78/0x80
kmem_cache_alloc+0x1b1/0x490
getname_flags.part.0+0x50/0x4f0
getname+0x8e/0xd0
do_sys_openat2+0xf5/0x4c0
__x64_sys_openat+0x13f/0x1f0
do_syscall_64+0x3b/0x90
entry_SYSCALL_64_after_hwframe+0x46/0xb0
RIP: 0033:0x7fe50212abe7
Code: 25 00 00 41 00 3d 00 00 41 00 74 47 64 8b 04 25 18 00 00 00 85 c0 75 6b 44 89 e2 48 89 ee bf 9c ff ff ff b8 01 01 00 00 0f 05 <48> 3d 00 f0 ff ff 0f 87 95 00 00 00 48 8b 4c 24 28 64 48 2b 0c 25
RSP: 002b:00007ffe6e49b6a0 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fe50212abe7
RDX: 00000000000800c2 RSI: 000055fc313a77f0 RDI: 00000000ffffff9c
RBP: 000055fc313a77f0 R08: 0000000000000014 R09: 00007ffe6e49f080
R10: 0000000000000180 R11: 0000000000000246 R12: 00000000000800c2
R13: 00007fe5021c9ca0 R14: 00007ffe6e49b740 R15: 8421084210842109
Modules linked in:
CR2: 0000000000000018
---[ end trace 0000000000000000 ]---
RIP: 0010:qlist_free_all+0xd3/0x190
Code: 03 05 a1 76 7b 03 48 8b 48 08 48 89 c2 f6 c1 01 0f 85 b6 00 00 00 0f 1f 44 00 00 48 8b 02 f6 c4 02 b8 00 00 00 00 48 0f 44 d0 <4c> 8b 72 18 e9 50 ff ff ff 49 83 7e 48 00 0f 85 68 ff ff ff 41 f7
RSP: 0018:ffff88801b727c70 EFLAGS: 00010246
RAX: 0000000000000000 RBX: ffff88801e033f70 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000001 RDI: ffffffff81771eb1
RBP: 0000000000000000 R08: ffff88801e033f70 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000001 R12: dffffc0000000000
R13: ffff88801b727cb0 R14: 0000000000000000 R15: ffff88803fbb5488
FS: 00007fe501c7b8c0(0000) GS:ffff88806ce00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000018 CR3: 000000003f886000 CR4: 0000000000350ef0
I/O error, dev loop7, sector 24 op 0x0:(READ) flags 0x80700 phys_seg 1 prio class 2
loop7: detected capacity change from 0 to 106
loop0: detected capacity change from 0 to 106
loop6: detected capacity change from 0 to 106
loop7: detected capacity change from 0 to 256
FAT-fs (loop7): Invalid FSINFO signature: 0x00000000, 0x00000000 (sector = 1)
audit: type=1400 audit(1657108084.472:10): avc: denied { block_suspend } for pid=4106 comm="syz-executor.2" capability=36 scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=capability2 permissive=1
loop7: detected capacity change from 0 to 256
FAT-fs (loop7): Invalid FSINFO signature: 0x00000000, 0x00000000 (sector = 1)
loop5: detected capacity change from 0 to 256
loop4: detected capacity change from 0 to 256
FAT-fs (loop5): Invalid FSINFO signature: 0x00000000, 0x00000000 (sector = 1)
FAT-fs (loop4): Invalid FSINFO signature: 0x00000000, 0x00000000 (sector = 1)
loop7: detected capacity change from 0 to 256
FAT-fs (loop7): Invalid FSINFO signature: 0x00000000, 0x00000000 (sector = 1)
loop4: detected capacity change from 0 to 256
FAT-fs (loop4): Invalid FSINFO signature: 0x00000000, 0x00000000 (sector = 1)
loop5: detected capacity change from 0 to 256
general protection fault, probably for non-canonical address 0x11febdc22003b88: 0000 [#2] PREEMPT SMP KASAN NOPTI
CPU: 1 PID: 4144 Comm: systemd-udevd Tainted: G B D 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
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 c3 76 7b 03 48 01 d0 48 c1 e8 0c 48 c1 e0 06 48 03 05 a1 76 7b 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:ffff888041de7c70 EFLAGS: 00010203
RAX: 011febdc22003b80 RBX: 47ffff88800eef2a RCX: 000000008014000b
RDX: 47ffff89000eef2a RSI: ffffea00003bbc80 RDI: 0000000040000000
RBP: 0000000000000000 R08: 47ffff88800eef2a R09: 000000008014000b
R10: ffffea00003bbc80 R11: 0000000000000000 R12: dffffc0000000000
R13: ffff888041de7cb0 R14: 0000000000000000 R15: ffff88800eef2bb9
FS: 00007fe501c7b8c0(0000) GS:ffff88806cf00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055fc2f178710 CR3: 000000000d16e000 CR4: 0000000000350ee0
Call Trace:
kasan_quarantine_reduce+0x180/0x200
__kasan_slab_alloc+0x78/0x80
kmem_cache_alloc+0x1b1/0x490
getname_flags.part.0+0x50/0x4f0
getname+0x8e/0xd0
do_sys_openat2+0xf5/0x4c0
__x64_sys_openat+0x13f/0x1f0
do_syscall_64+0x3b/0x90
entry_SYSCALL_64_after_hwframe+0x46/0xb0
RIP: 0033:0x7fe50212abe7
Code: 25 00 00 41 00 3d 00 00 41 00 74 47 64 8b 04 25 18 00 00 00 85 c0 75 6b 44 89 e2 48 89 ee bf 9c ff ff ff b8 01 01 00 00 0f 05 <48> 3d 00 f0 ff ff 0f 87 95 00 00 00 48 8b 4c 24 28 64 48 2b 0c 25
RSP: 002b:00007ffe6e49b6b0 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 000055fc3139f7f0 RCX: 00007fe50212abe7
RDX: 0000000000080000 RSI: 00007ffe6e49b8f0 RDI: 00000000ffffff9c
RBP: 00007ffe6e49b8f0 R08: 0000000000000008 R09: 0000000000000001
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000080000
R13: 000055fc3139f7f0 R14: 0000000000000001 R15: 000055fc313f9cf0
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:qlist_free_all+0xd3/0x190
Code: 03 05 a1 76 7b 03 48 8b 48 08 48 89 c2 f6 c1 01 0f 85 b6 00 00 00 0f 1f 44 00 00 48 8b 02 f6 c4 02 b8 00 00 00 00 48 0f 44 d0 <4c> 8b 72 18 e9 50 ff ff ff 49 83 7e 48 00 0f 85 68 ff ff ff 41 f7
RSP: 0018:ffff88801b727c70 EFLAGS: 00010246
RAX: 0000000000000000 RBX: ffff88801e033f70 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000001 RDI: ffffffff81771eb1
RBP: 0000000000000000 R08: ffff88801e033f70 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000001 R12: dffffc0000000000
R13: ffff88801b727cb0 R14: 0000000000000000 R15: ffff88803fbb5488
FS: 00007fe501c7b8c0(0000) GS:ffff88806cf00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055fc2f178710 CR3: 000000000d16e000 CR4: 0000000000350ee0
FAT-fs (loop5): Invalid FSINFO signature: 0x00000000, 0x00000000 (sector = 1)
I/O error, dev loop5, sector 0 op 0x0:(READ) flags 0x80700 phys_seg 1 prio class 2
----------------
Code disassembly (best guess):
0: 03 05 a1 76 7b 03 add 0x37b76a1(%rip),%eax # 0x37b76a7
6: 48 8b 48 08 mov 0x8(%rax),%rcx
a: 48 89 c2 mov %rax,%rdx
d: f6 c1 01 test $0x1,%cl
10: 0f 85 b6 00 00 00 jne 0xcc
16: 0f 1f 44 00 00 nopl 0x0(%rax,%rax,1)
1b: 48 8b 02 mov (%rdx),%rax
1e: f6 c4 02 test $0x2,%ah
21: b8 00 00 00 00 mov $0x0,%eax
26: 48 0f 44 d0 cmove %rax,%rdx
* 2a: 4c 8b 72 18 mov 0x18(%rdx),%r14 <-- trapping instruction
2e: e9 50 ff ff ff jmpq 0xffffff83
33: 49 83 7e 48 00 cmpq $0x0,0x48(%r14)
38: 0f 85 68 ff ff ff jne 0xffffffa6
3e: 41 rex.B
3f: f7 .byte 0xf7