------------[ cut here ]------------
kernfs_put: syz0/memory.events.local: released with incorrect active_ref 0
WARNING: CPU: 0 PID: 124 at fs/kernfs/dir.c:531 kernfs_put.part.0+0x433/0x540
Modules linked in:
CPU: 0 PID: 124 Comm: kworker/0:3 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:ffff88801804fbd8 EFLAGS: 00010286
WARNING: CPU: 1 PID: 214 at fs/kernfs/dir.c:504 kernfs_get.part.0+0x69/0x80
Modules linked in:
CPU: 1 PID: 214 Comm: rs:main Q:Reg 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
RAX: 0000000000000000 RBX: dffffc0000000000 RCX: 0000000000000000
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
RDX: ffff888016eb0000 RSI: ffffffff812b6848 RDI: ffffed1003009f6d
RSP: 0018:ffff88806cf09c80 EFLAGS: 00010046
RAX: 0000000000000000 RBX: ffff88801ab390e8 RCX: 0000000000000100
RDX: ffff88801a965040 RSI: ffffffff819d2579 RDI: 0000000000000005
RBP: 0000000000000000 R08: 0000000000000005 R09: 0000000000000000
RBP: ffff88801ab39120 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000001
R10: 0000000000000000 R11: 0000000000000001 R12: ffff88801ab390e8
R13: 1ffffffff0a01e40 R14: ffff88801ab390e8 R15: ffff8880451384f0
FS: 00007ff9af118700(0000) GS:ffff88806cf00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
R13: ffff88800e1ac0e8 R14: 0000000000000000 R15: ffff88800ee22aa0
CR2: 00007f7fbf9436b8 CR3: 0000000018164000 CR4: 0000000000350ee0
Call Trace:
kernfs_get+0x1b/0x30
FS: 0000000000000000(0000) GS:ffff88806ce00000(0000) knlGS:0000000000000000
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:unwind_next_frame+0x1574/0x20a0
Code: 80 3c 02 00 0f 84 72 f8 ff ff e8 97 8f 65 00 e9 68 f8 ff ff 48 b8 00 00 00 00 00 fc ff df 48 8b 14 24 48 c1 ea 03 80 3c 02 00 <0f> 85 3c 08 00 00 49 8d 7e 08 49 8b 5e 48 48 b8 00 00 00 00 00 fc
RSP: 0018:ffff88801b877458 EFLAGS: 00000246
RAX: dffffc0000000000 RBX: 0000000000000001 RCX: 0000000000000001
RDX: 1ffff1100370eeae RSI: ffff88801b8775c0 RDI: ffff88801b877578
RBP: 0000000000000000 R08: ffffffff85c0ab48 R09: ffffffff85c0ab4c
R10: ffffed100370eeb2 R11: ffff88801b877568 R12: ffff88801b877569
R13: ffff88801b877588 R14: ffff88801b877528 R15: 0000000000000005
__unwind_start+0x50b/0x7c0
arch_stack_walk+0x5f/0xf0
stack_trace_save+0x8c/0xc0
kasan_save_stack+0x1e/0x40
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2df24000 CR3: 0000000044518000 CR4: 0000000000350ef0
Call Trace:
kernfs_put+0x42/0x50
__kasan_record_aux_stack+0x97/0xa0
kernfs_notify_workfn+0x417/0x560
call_rcu+0x6a/0xa20
process_one_work+0xa0f/0x1690
kmem_cache_free+0xc1/0x600
jbd2_journal_stop+0x5cb/0xed0
worker_thread+0x637/0x1250
__ext4_journal_stop+0xde/0x1f0
kthread+0x2ed/0x3a0
ext4_dirty_inode+0xe8/0x110
__mark_inode_dirty+0x455/0xf00
ret_from_fork+0x22/0x30
generic_update_time+0x21d/0x350
file_modified_flags+0x2d0/0x320
irq event stamp: 313317
hardirqs last enabled at (313329): [] asm_sysvec_apic_timer_interrupt+0x1b/0x20
ext4_buffered_write_iter+0xf9/0x330
hardirqs last disabled at (313336): [] console_emit_next_record.constprop.0+0x667/0x800
ext4_file_write_iter+0x3d5/0x1820
softirqs last enabled at (313132): [] __irq_exit_rcu+0x113/0x170
softirqs last disabled at (313095): [] __irq_exit_rcu+0x113/0x170
---[ end trace 0000000000000000 ]---
new_sync_write+0x31b/0x4e0
vfs_write+0x7b9/0xac0
ksys_write+0x127/0x250
do_syscall_64+0x3b/0x90
entry_SYSCALL_64_after_hwframe+0x46/0xb0
RIP: 0033:0x7ff9aff5bfef
Code: 89 54 24 18 48 89 74 24 10 89 7c 24 08 e8 29 fd ff ff 48 8b 54 24 18 48 8b 74 24 10 41 89 c0 8b 7c 24 08 b8 01 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 31 44 89 c7 48 89 44 24 08 e8 5c fd ff ff 48
RSP: 002b:00007ff9af117860 EFLAGS: 00000293 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007ff9980221c0 RCX: 00007ff9aff5bfef
RDX: 00000000000002b5 RSI: 00007ff998022460 RDI: 0000000000000007
RBP: 00000000000002b5 R08: 0000000000000000 R09: 00007ff998000080
R10: 0000000000000000 R11: 0000000000000293 R12: 00007ff998022460
R13: 0000000000000000 R14: 00000000000000a5 R15: 00007ff9980221c0
irq event stamp: 49723
hardirqs last enabled at (49722): [] _raw_spin_unlock_irq+0x1f/0x40
hardirqs last disabled at (49723): [] _raw_spin_lock_irqsave+0x4e/0x50
softirqs last enabled at (49574): [] __mark_inode_dirty+0xba5/0xf00
softirqs last disabled at (49715): [] __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 ffff88801ab390e8 by task rs:main Q:Reg/214
CPU: 1 PID: 214 Comm: rs:main Q:Reg 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
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+0x8e/0xc0
asm_sysvec_apic_timer_interrupt+0x1b/0x20
RIP: 0010:unwind_next_frame+0x1574/0x20a0
Code: 80 3c 02 00 0f 84 72 f8 ff ff e8 97 8f 65 00 e9 68 f8 ff ff 48 b8 00 00 00 00 00 fc ff df 48 8b 14 24 48 c1 ea 03 80 3c 02 00 <0f> 85 3c 08 00 00 49 8d 7e 08 49 8b 5e 48 48 b8 00 00 00 00 00 fc
RSP: 0018:ffff88801b877458 EFLAGS: 00000246
RAX: dffffc0000000000 RBX: 0000000000000001 RCX: 0000000000000001
RDX: 1ffff1100370eeae RSI: ffff88801b8775c0 RDI: ffff88801b877578
RBP: 0000000000000000 R08: ffffffff85c0ab48 R09: ffffffff85c0ab4c
R10: ffffed100370eeb2 R11: ffff88801b877568 R12: ffff88801b877569
R13: ffff88801b877588 R14: ffff88801b877528 R15: 0000000000000005
__unwind_start+0x50b/0x7c0
arch_stack_walk+0x5f/0xf0
stack_trace_save+0x8c/0xc0
kasan_save_stack+0x1e/0x40
__kasan_record_aux_stack+0x97/0xa0
call_rcu+0x6a/0xa20
kmem_cache_free+0xc1/0x600
jbd2_journal_stop+0x5cb/0xed0
__ext4_journal_stop+0xde/0x1f0
ext4_dirty_inode+0xe8/0x110
__mark_inode_dirty+0x455/0xf00
generic_update_time+0x21d/0x350
file_modified_flags+0x2d0/0x320
ext4_buffered_write_iter+0xf9/0x330
ext4_file_write_iter+0x3d5/0x1820
new_sync_write+0x31b/0x4e0
vfs_write+0x7b9/0xac0
ksys_write+0x127/0x250
do_syscall_64+0x3b/0x90
entry_SYSCALL_64_after_hwframe+0x46/0xb0
RIP: 0033:0x7ff9aff5bfef
Code: 89 54 24 18 48 89 74 24 10 89 7c 24 08 e8 29 fd ff ff 48 8b 54 24 18 48 8b 74 24 10 41 89 c0 8b 7c 24 08 b8 01 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 31 44 89 c7 48 89 44 24 08 e8 5c fd ff ff 48
RSP: 002b:00007ff9af117860 EFLAGS: 00000293 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007ff9980221c0 RCX: 00007ff9aff5bfef
RDX: 00000000000002b5 RSI: 00007ff998022460 RDI: 0000000000000007
RBP: 00000000000002b5 R08: 0000000000000000 R09: 00007ff998000080
R10: 0000000000000000 R11: 0000000000000293 R12: 00007ff998022460
R13: 0000000000000000 R14: 00000000000000a5 R15: 00007ff9980221c0
Allocated by task 293:
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 124:
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 ffff88801ab390e8
which belongs to the cache kernfs_node_cache of size 168
The buggy address is located 0 bytes inside of
168-byte region [ffff88801ab390e8, ffff88801ab39190)
The buggy address belongs to the physical page:
page:000000002eb48890 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1ab39
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:
ffff88801ab38f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
ffff88801ab39000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff88801ab39080: 00 00 00 00 00 fc fc fc fc fc fc fc fc fa fb fb
^
ffff88801ab39100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88801ab39180: fb fb fc fc fc fc fc fc fc fc 00 00 00 00 00 00
==================================================================
----------------
Code disassembly (best guess):
0: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1)
4: 0f 84 72 f8 ff ff je 0xfffff87c
a: e8 97 8f 65 00 callq 0x658fa6
f: e9 68 f8 ff ff jmpq 0xfffff87c
14: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax
1b: fc ff df
1e: 48 8b 14 24 mov (%rsp),%rdx
22: 48 c1 ea 03 shr $0x3,%rdx
26: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1)
* 2a: 0f 85 3c 08 00 00 jne 0x86c <-- trapping instruction
30: 49 8d 7e 08 lea 0x8(%r14),%rdi
34: 49 8b 5e 48 mov 0x48(%r14),%rbx
38: 48 rex.W
39: b8 00 00 00 00 mov $0x0,%eax
3e: 00 fc add %bh,%ah