EXT4-fs (sda): re-mounted. Quota mode: none.
------------[ cut here ]------------
kernfs_put: syz7/pids.events: released with incorrect active_ref 0
WARNING: CPU: 0 PID: 228 at fs/kernfs/dir.c:531 kernfs_put.part.0+0x433/0x540
Modules linked in:
CPU: 0 PID: 228 Comm: kworker/0:3 Not tainted 5.19.0-rc4-next-20220704 #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
------------[ cut here ]------------
Code: 03 80 3c 18 00 0f 85 ea 00 00 00 4d 8b 7d 38 e8 73 0b a7 ff 48 8b 14 24 44 89 f1 4c 89 fe 48 c7 c7 e0 58 72 84 e8 93 9c 6c 02 <0f> 0b e9 b9 fc ff ff 48 89 ef e8 0e b3 d9 ff e9 c1 fd ff ff e8 04
WARNING: CPU: 1 PID: 5768 at fs/kernfs/dir.c:504 kernfs_get.part.0+0x69/0x80
RSP: 0018:ffff888019787bd8 EFLAGS: 00010286
Modules linked in:
CPU: 1 PID: 5768 Comm: syz-fuzzer Not tainted 5.19.0-rc4-next-20220704 #1
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
RAX: 0000000000000000 RBX: dffffc0000000000 RCX: 0000000000000000
Code: 31 ff 89 ee e8 c8 0c a7 ff 85 ed 74 18 e8 ef 0f a7 ff be 04 00 00 00 48 89 df e8 d2 ba d9 ff f0 ff 03 5b 5d c3 e8 d7 0f a7 ff <0f> 0b eb df 48 89 df e8 7b b7 d9 ff eb c6 66 0f 1f 84 00 00 00 00
RSP: 0000:ffff888045f17bc8 EFLAGS: 00010046
RDX: ffff888009da9ac0 RSI: ffffffff812bd348 RDI: ffffed10032f0f6d
RAX: 0000000000000000 RBX: ffff88800ed32570 RCX: 0000000000000100
RDX: ffff8880436d5040 RSI: ffffffff819de5c9 RDI: 0000000000000005
RBP: ffff88800ed325a8 R08: 0000000000000005 R09: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000001
R13: 1ffffffff0a01e40 R14: ffff88800ed32570 R15: ffff888017d4b530
R10: 0000000000000000 R11: 0000000000000001 R12: ffff88800ed32570
FS: 000000c0002d4790(0000) GS:ffff88806cf00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
R13: ffff88801b5841d0 R14: 0000000000000000 R15: ffff888019409500
CR2: 00007fd3a4ead8e0 CR3: 000000000da50000 CR4: 0000000000350ee0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff4ff0 DR7: 0000000000000400
FS: 0000000000000000(0000) GS:ffff88806ce00000(0000) knlGS:0000000000000000
Call Trace:
kernfs_get+0x1b/0x30
kernfs_notify+0x180/0x350
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
cgroup_file_notify+0xf5/0x1a0
CR2: 00007f4649a749c8 CR3: 0000000049610000 CR4: 0000000000350ef0
call_timer_fn+0x17d/0x5f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff4ff0 DR7: 0000000000000400
Call Trace:
kernfs_put+0x42/0x50
kernfs_notify_workfn+0x417/0x560
__run_timers.part.0+0x65e/0xa50
process_one_work+0xa0f/0x1690
run_timer_softirq+0xae/0x1a0
__do_softirq+0x1c8/0x8cc
__irq_exit_rcu+0x113/0x170
worker_thread+0x637/0x1250
irq_exit_rcu+0x5/0x20
sysvec_apic_timer_interrupt+0x40/0xc0
asm_sysvec_apic_timer_interrupt+0x1b/0x20
kthread+0x2ed/0x3a0
RIP: 0033:0x40c689
Code: 24 08 b9 48 00 00 00 48 0f 44 f9 48 89 7c 24 38 48 89 7c 24 10 4c 89 44 24 18 e8 d2 93 00 00 48 8b 84 24 a8 00 00 00 48 8b 08 <48> 8b 54 24 38 48 39 ca 76 2e 48 8b 58 08 48 89 d6 48 29 ca 48 8d
RSP: 002b:000000c000c03670 EFLAGS: 00000202
RAX: 000000000092a600 RBX: 0000000000000008 RCX: 0000000000000010
ret_from_fork+0x22/0x30
RDX: 0000000000203001 RSI: 00007f970c99bb25 RDI: 0000000000000032
RBP: 000000c000c03700 R08: 00007f970c99bb25 R09: 0000000000203001
irq event stamp: 873535
R10: 0000000000000004 R11: 0000000000000032 R12: 00000000000000fa
hardirqs last enabled at (873545): [] asm_sysvec_apic_timer_interrupt+0x1b/0x20
R13: 00aaaaaaaaaaaaaa R14: 0000000000e5dabc R15: 0000000000000038
hardirqs last disabled at (873554): [] sysvec_apic_timer_interrupt+0xb/0xc0
softirqs last enabled at (871920): [] __irq_exit_rcu+0x113/0x170
irq event stamp: 56551
hardirqs last enabled at (56550): [] _raw_spin_unlock_irq+0x1f/0x40
softirqs last disabled at (871915): [] __irq_exit_rcu+0x113/0x170
hardirqs last disabled at (56551): [] _raw_spin_lock_irqsave+0x4e/0x50
softirqs last enabled at (56120): [] tcp_recvmsg+0x11d/0x630
---[ end trace 0000000000000000 ]---
softirqs last disabled at (56547): [] __irq_exit_rcu+0x113/0x170
---[ end trace 0000000000000000 ]---
==================================================================
BUG: KASAN: use-after-free in kernfs_get.part.0+0x5e/0x80
Write of size 4 at addr ffff88800ed32570 by task syz-fuzzer/5768
CPU: 1 PID: 5768 Comm: syz-fuzzer Tainted: G W 5.19.0-rc4-next-20220704 #1
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.14.0-0-g155821a1990b-prebuilt.qemu.org 04/01/2014
Call Trace:
dump_stack_lvl+0x8b/0xb3
print_report.cold+0x5e/0x5e1
kasan_report+0xb1/0x1b0
kasan_check_range+0x35/0x1b0
kernfs_get.part.0+0x5e/0x80
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+0x40/0xc0
asm_sysvec_apic_timer_interrupt+0x1b/0x20
RIP: 0033:0x40c689
Code: 24 08 b9 48 00 00 00 48 0f 44 f9 48 89 7c 24 38 48 89 7c 24 10 4c 89 44 24 18 e8 d2 93 00 00 48 8b 84 24 a8 00 00 00 48 8b 08 <48> 8b 54 24 38 48 39 ca 76 2e 48 8b 58 08 48 89 d6 48 29 ca 48 8d
RSP: 002b:000000c000c03670 EFLAGS: 00000202
RAX: 000000000092a600 RBX: 0000000000000008 RCX: 0000000000000010
RDX: 0000000000203001 RSI: 00007f970c99bb25 RDI: 0000000000000032
RBP: 000000c000c03700 R08: 00007f970c99bb25 R09: 0000000000203001
R10: 0000000000000004 R11: 0000000000000032 R12: 00000000000000fa
R13: 00aaaaaaaaaaaaaa R14: 0000000000e5dabc R15: 0000000000000038
Allocated by task 300:
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 228:
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 ffff88800ed32570
which belongs to the cache kernfs_node_cache of size 168
The buggy address is located 0 bytes inside of
168-byte region [ffff88800ed32570, ffff88800ed32618)
The buggy address belongs to the physical page:
page:0000000008c64d6b refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0xed32
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:
ffff88800ed32400: 00 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc
ffff88800ed32480: fc 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff88800ed32500: 00 00 00 00 00 00 fc fc fc fc fc fc fc fc fa fb
^
ffff88800ed32580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88800ed32600: fb fb fb fc fc fc fc fc fc fc fc 00 00 00 00 00
==================================================================
EXT4-fs (sda): re-mounted. Quota mode: none.
EXT4-fs (sda): re-mounted. Quota mode: none.
EXT4-fs (sda): re-mounted. Quota mode: none.