audit: type=1400 audit(1663161860.687:8): avc: denied { kernel } for pid=3692 comm="syz-executor.7" scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=perf_event permissive=1
------------[ cut here ]------------
======================================================
WARNING: possible circular locking dependency detected
6.0.0-rc5-next-20220914 #1 Not tainted
------------------------------------------------------
syz-executor.7/3694 is trying to acquire lock:
ffffffff853fa878 ((console_sem).lock){....}-{2:2}, at: down_trylock+0xe/0x70
but task is already holding lock:
ffff88800a30dc20 (&ctx->lock){....}-{2:2}, at: __perf_event_task_sched_in+0x2a0/0x6e0
which lock already depends on the new lock.
the existing dependency chain (in reverse order) is:
-> #3 (&ctx->lock){....}-{2:2}:
_raw_spin_lock+0x2a/0x40
__perf_event_task_sched_out+0x53b/0x18d0
__schedule+0xedd/0x2470
schedule+0xda/0x1b0
exit_to_user_mode_prepare+0x114/0x1a0
syscall_exit_to_user_mode+0x19/0x40
do_syscall_64+0x48/0x90
entry_SYSCALL_64_after_hwframe+0x63/0xcd
-> #2 (&rq->__lock){-.-.}-{2:2}:
_raw_spin_lock_nested+0x30/0x40
raw_spin_rq_lock_nested+0x1e/0x30
task_fork_fair+0x63/0x4d0
sched_cgroup_fork+0x3d0/0x540
copy_process+0x4183/0x6e20
kernel_clone+0xe7/0x890
user_mode_thread+0xad/0xf0
rest_init+0x24/0x250
arch_call_rest_init+0xf/0x14
start_kernel+0x4c1/0x4e6
secondary_startup_64_no_verify+0xe0/0xeb
-> #1 (&p->pi_lock){-.-.}-{2:2}:
_raw_spin_lock_irqsave+0x39/0x60
try_to_wake_up+0xab/0x1920
up+0x75/0xb0
__up_console_sem+0x6e/0x80
console_unlock+0x46a/0x590
do_con_write+0xc05/0x1d50
con_write+0x21/0x40
n_tty_write+0x4d4/0xfe0
file_tty_write.constprop.0+0x49c/0x8f0
vfs_write+0x9c3/0xd90
ksys_write+0x127/0x250
do_syscall_64+0x3b/0x90
entry_SYSCALL_64_after_hwframe+0x63/0xcd
-> #0 ((console_sem).lock){....}-{2:2}:
__lock_acquire+0x2a02/0x5e70
lock_acquire+0x1a2/0x530
_raw_spin_lock_irqsave+0x39/0x60
down_trylock+0xe/0x70
__down_trylock_console_sem+0x3b/0xd0
vprintk_emit+0x16b/0x560
vprintk+0x84/0xa0
_printk+0xba/0xf1
report_bug.cold+0x72/0xab
handle_bug+0x3c/0x70
exc_invalid_op+0x14/0x50
asm_exc_invalid_op+0x16/0x20
event_filter_match+0x422/0x660
merge_sched_in+0x107/0x1110
visit_groups_merge.constprop.0.isra.0+0x4fc/0xef0
ctx_sched_in+0x2e6/0x770
perf_event_sched_in+0x58/0x80
__perf_event_task_sched_in+0x408/0x6e0
finish_task_switch.isra.0+0x46d/0x8a0
__schedule+0x89b/0x2470
preempt_schedule_common+0x45/0xc0
__cond_resched+0x17/0x30
prepare_alloc_pages+0x33f/0x500
__alloc_pages+0x145/0x500
vma_alloc_folio+0xde/0x470
wp_page_copy+0xdfc/0x2300
do_wp_page+0x199/0x2050
__handle_mm_fault+0x11eb/0x35e0
handle_mm_fault+0x2e6/0xa20
do_user_addr_fault+0x536/0x1300
exc_page_fault+0x98/0x1a0
asm_exc_page_fault+0x22/0x30
__put_user_nocheck_4+0x3/0x11
__sys_sendmmsg+0x1c5/0x460
__x64_sys_sendmmsg+0x99/0x100
do_syscall_64+0x3b/0x90
entry_SYSCALL_64_after_hwframe+0x63/0xcd
other info that might help us debug this:
Chain exists of:
(console_sem).lock --> &rq->__lock --> &ctx->lock
Possible unsafe locking scenario:
CPU0 CPU1
---- ----
lock(&ctx->lock);
lock(&rq->__lock);
lock(&ctx->lock);
lock((console_sem).lock);
*** DEADLOCK ***
3 locks held by syz-executor.7/3694:
#0: ffff888040d69d58 (&mm->mmap_lock#2){++++}-{3:3}, at: do_user_addr_fault+0x337/0x1300
#1: ffff88806ce3d120 (&cpuctx_lock){....}-{2:2}, at: __perf_event_task_sched_in+0x28f/0x6e0
#2: ffff88800a30dc20 (&ctx->lock){....}-{2:2}, at: __perf_event_task_sched_in+0x2a0/0x6e0
stack backtrace:
CPU: 0 PID: 3694 Comm: syz-executor.7 Not tainted 6.0.0-rc5-next-20220914 #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
check_noncircular+0x263/0x2e0
__lock_acquire+0x2a02/0x5e70
lock_acquire+0x1a2/0x530
_raw_spin_lock_irqsave+0x39/0x60
down_trylock+0xe/0x70
__down_trylock_console_sem+0x3b/0xd0
vprintk_emit+0x16b/0x560
vprintk+0x84/0xa0
_printk+0xba/0xf1
report_bug.cold+0x72/0xab
handle_bug+0x3c/0x70
exc_invalid_op+0x14/0x50
asm_exc_invalid_op+0x16/0x20
RIP: 0010:event_filter_match+0x422/0x660
Code: 00 00 00 e9 7c fc ff ff e8 4b 15 f1 ff 65 8b 2d c0 73 ad 7e 31 ff 89 ee e8 eb 11 f1 ff 85 ed 0f 84 ef 00 00 00 e8 2e 15 f1 ff <0f> 0b eb 9f e8 25 80 23 00 e9 17 fc ff ff e8 1b 15 f1 ff 48 8d 7b
RSP: 0018:ffff8880406371f8 EFLAGS: 00010006
RAX: 0000000040000002 RBX: ffff88801c0f0000 RCX: 0000000000000000
RDX: ffff88801dead040 RSI: ffffffff81550212 RDI: 0000000000000005
RBP: 0000000000000000 R08: 0000000000000005 R09: 0000000000000001
R10: 0000000000000000 R11: ffffffff865ac01b R12: ffff88801c0f0220
R13: 0000000000000000 R14: ffff88801c0f00a8 R15: ffff88801c0f0220
merge_sched_in+0x107/0x1110
visit_groups_merge.constprop.0.isra.0+0x4fc/0xef0
ctx_sched_in+0x2e6/0x770
perf_event_sched_in+0x58/0x80
__perf_event_task_sched_in+0x408/0x6e0
finish_task_switch.isra.0+0x46d/0x8a0
__schedule+0x89b/0x2470
preempt_schedule_common+0x45/0xc0
__cond_resched+0x17/0x30
prepare_alloc_pages+0x33f/0x500
__alloc_pages+0x145/0x500
vma_alloc_folio+0xde/0x470
wp_page_copy+0xdfc/0x2300
do_wp_page+0x199/0x2050
__handle_mm_fault+0x11eb/0x35e0
handle_mm_fault+0x2e6/0xa20
do_user_addr_fault+0x536/0x1300
exc_page_fault+0x98/0x1a0
asm_exc_page_fault+0x22/0x30
RIP: 0010:__put_user_nocheck_4+0x3/0x11
Code: 00 00 48 39 d9 73 54 0f 01 cb 66 89 01 31 c9 0f 01 ca e9 41 62 4c 00 90 48 bb fd ef ff ff ff 7f 00 00 48 39 d9 73 34 0f 01 cb <89> 01 31 c9 0f 01 ca e9 22 62 4c 00 66 90 48 bb f9 ef ff ff ff 7f
RSP: 0018:ffff888040637ce8 EFLAGS: 00050293
RAX: 0000000000000000 RBX: 00007fffffffeffd RCX: 000000002000b038
RDX: 0000000000040000 RSI: ffffffff83226cb8 RDI: 0000000000000000
RBP: 000000000004001c R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000001 R12: 000000000000021e
R13: 000000002000b000 R14: 0000000000000400 R15: 00000000000003ff
__sys_sendmmsg+0x1c5/0x460
__x64_sys_sendmmsg+0x99/0x100
do_syscall_64+0x3b/0x90
entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f5bc95e5b19
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
RSP: 002b:00007f5bc6b5b188 EFLAGS: 00000246 ORIG_RAX: 0000000000000133
RAX: ffffffffffffffda RBX: 00007f5bc96f8f60 RCX: 00007f5bc95e5b19
RDX: 0000000004000101 RSI: 0000000020002880 RDI: 0000000000000005
RBP: 00007f5bc963ff6d R08: 0000000000000000 R09: 0000000000000000
R10: 000000000000001c R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffee6c8dd7f R14: 00007f5bc6b5b300 R15: 0000000000022000
WARNING: CPU: 0 PID: 3694 at kernel/events/core.c:2233 event_filter_match+0x422/0x660
Modules linked in:
CPU: 0 PID: 3694 Comm: syz-executor.7 Not tainted 6.0.0-rc5-next-20220914 #1
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.14.0-0-g155821a1990b-prebuilt.qemu.org 04/01/2014
RIP: 0010:event_filter_match+0x422/0x660
Code: 00 00 00 e9 7c fc ff ff e8 4b 15 f1 ff 65 8b 2d c0 73 ad 7e 31 ff 89 ee e8 eb 11 f1 ff 85 ed 0f 84 ef 00 00 00 e8 2e 15 f1 ff <0f> 0b eb 9f e8 25 80 23 00 e9 17 fc ff ff e8 1b 15 f1 ff 48 8d 7b
RSP: 0018:ffff8880406371f8 EFLAGS: 00010006
RAX: 0000000040000002 RBX: ffff88801c0f0000 RCX: 0000000000000000
RDX: ffff88801dead040 RSI: ffffffff81550212 RDI: 0000000000000005
RBP: 0000000000000000 R08: 0000000000000005 R09: 0000000000000001
R10: 0000000000000000 R11: ffffffff865ac01b R12: ffff88801c0f0220
R13: 0000000000000000 R14: ffff88801c0f00a8 R15: ffff88801c0f0220
FS: 00007f5bc6b5b700(0000) GS:ffff88806ce00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f704ccce000 CR3: 000000001c11c000 CR4: 0000000000350ef0
Call Trace:
merge_sched_in+0x107/0x1110
visit_groups_merge.constprop.0.isra.0+0x4fc/0xef0
ctx_sched_in+0x2e6/0x770
perf_event_sched_in+0x58/0x80
__perf_event_task_sched_in+0x408/0x6e0
finish_task_switch.isra.0+0x46d/0x8a0
__schedule+0x89b/0x2470
preempt_schedule_common+0x45/0xc0
__cond_resched+0x17/0x30
prepare_alloc_pages+0x33f/0x500
__alloc_pages+0x145/0x500
vma_alloc_folio+0xde/0x470
wp_page_copy+0xdfc/0x2300
do_wp_page+0x199/0x2050
__handle_mm_fault+0x11eb/0x35e0
handle_mm_fault+0x2e6/0xa20
do_user_addr_fault+0x536/0x1300
exc_page_fault+0x98/0x1a0
asm_exc_page_fault+0x22/0x30
RIP: 0010:__put_user_nocheck_4+0x3/0x11
Code: 00 00 48 39 d9 73 54 0f 01 cb 66 89 01 31 c9 0f 01 ca e9 41 62 4c 00 90 48 bb fd ef ff ff ff 7f 00 00 48 39 d9 73 34 0f 01 cb <89> 01 31 c9 0f 01 ca e9 22 62 4c 00 66 90 48 bb f9 ef ff ff ff 7f
RSP: 0018:ffff888040637ce8 EFLAGS: 00050293
RAX: 0000000000000000 RBX: 00007fffffffeffd RCX: 000000002000b038
RDX: 0000000000040000 RSI: ffffffff83226cb8 RDI: 0000000000000000
RBP: 000000000004001c R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000001 R12: 000000000000021e
R13: 000000002000b000 R14: 0000000000000400 R15: 00000000000003ff
__sys_sendmmsg+0x1c5/0x460
__x64_sys_sendmmsg+0x99/0x100
do_syscall_64+0x3b/0x90
entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f5bc95e5b19
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
RSP: 002b:00007f5bc6b5b188 EFLAGS: 00000246 ORIG_RAX: 0000000000000133
RAX: ffffffffffffffda RBX: 00007f5bc96f8f60 RCX: 00007f5bc95e5b19
RDX: 0000000004000101 RSI: 0000000020002880 RDI: 0000000000000005
RBP: 00007f5bc963ff6d R08: 0000000000000000 R09: 0000000000000000
R10: 000000000000001c R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffee6c8dd7f R14: 00007f5bc6b5b300 R15: 0000000000022000
irq event stamp: 8608
hardirqs last enabled at (8607): [] handle_mm_fault+0x6fd/0xa20
hardirqs last disabled at (8608): [] __schedule+0x1225/0x2470
softirqs last enabled at (8598): [] rt_set_nexthop.constprop.0+0x614/0x1190
softirqs last disabled at (8596): [] rt_set_nexthop.constprop.0+0x578/0x1190
---[ end trace 0000000000000000 ]---
syz-executor.7 (3694) used greatest stack depth: 24048 bytes left
hrtimer: interrupt took 17924 ns
Bluetooth: hci2: Opcode 0x c03 failed: -110
Bluetooth: hci0: Opcode 0x c03 failed: -110
Bluetooth: hci5: Opcode 0x c03 failed: -110
Bluetooth: hci4: Opcode 0x c03 failed: -110
----------------
Code disassembly (best guess):
0: 00 00 add %al,(%rax)
2: 48 39 d9 cmp %rbx,%rcx
5: 73 54 jae 0x5b
7: 0f 01 cb stac
a: 66 89 01 mov %ax,(%rcx)
d: 31 c9 xor %ecx,%ecx
f: 0f 01 ca clac
12: e9 41 62 4c 00 jmpq 0x4c6258
17: 90 nop
18: 48 bb fd ef ff ff ff movabs $0x7fffffffeffd,%rbx
1f: 7f 00 00
22: 48 39 d9 cmp %rbx,%rcx
25: 73 34 jae 0x5b
27: 0f 01 cb stac
* 2a: 89 01 mov %eax,(%rcx) <-- trapping instruction
2c: 31 c9 xor %ecx,%ecx
2e: 0f 01 ca clac
31: e9 22 62 4c 00 jmpq 0x4c6258
36: 66 90 xchg %ax,%ax
38: 48 rex.W
39: bb f9 ef ff ff mov $0xffffeff9,%ebx
3e: ff (bad)
3f: 7f .byte 0x7f