audit: type=1400 audit(1665040333.358:8): avc: denied { kernel } for pid=3686 comm="syz-executor.4" scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=perf_event permissive=1
hrtimer: interrupt took 35927 ns
------------[ cut here ]------------
======================================================
WARNING: possible circular locking dependency detected
6.0.0-next-20221005 #1 Not tainted
------------------------------------------------------
syz-executor.4/3688 is trying to acquire lock:
ffffffff853faaf8 ((console_sem).lock){-.-.}-{2:2}, at: down_trylock+0xe/0x70
but task is already holding lock:
ffff88801761a020 (&ctx->lock){....}-{2:2}, at: __perf_event_task_sched_out+0x53b/0x18d0
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
futex_wait_queue+0xf5/0x1e0
futex_wait+0x28e/0x690
do_futex+0x2ff/0x380
__x64_sys_futex+0x1c6/0x4d0
do_syscall_64+0x3b/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+0x4c6/0x4eb
secondary_startup_64_no_verify+0xe0/0xeb
-> #1 (&p->pi_lock){-.-.}-{2:2}:
_raw_spin_lock_irqsave+0x39/0x60
try_to_wake_up+0xab/0x1930
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+0x455/0x8a0
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
group_sched_out.part.0+0x2c7/0x460
ctx_sched_out+0x8f1/0xc10
__perf_event_task_sched_out+0x6d0/0x18d0
__schedule+0xedd/0x2470
preempt_schedule_common+0x45/0xc0
__cond_resched+0x17/0x30
prepare_alloc_pages+0x33f/0x500
__alloc_pages+0x145/0x500
vma_alloc_folio+0xde/0x470
__handle_mm_fault+0x1025/0x35e0
handle_mm_fault+0x2e6/0xa20
do_user_addr_fault+0x536/0x1300
exc_page_fault+0x98/0x1a0
asm_exc_page_fault+0x22/0x30
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.4/3688:
#0: ffff888019c03958 (&mm->mmap_lock#2){++++}-{3:3}, at: do_user_addr_fault+0x337/0x1300
#1: ffff88806cf37e98 (&rq->__lock){-.-.}-{2:2}, at: __schedule+0x1cf/0x2470
#2: ffff88801761a020 (&ctx->lock){....}-{2:2}, at: __perf_event_task_sched_out+0x53b/0x18d0
stack backtrace:
CPU: 1 PID: 3688 Comm: syz-executor.4 Not tainted 6.0.0-next-20221005 #1
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 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:group_sched_out.part.0+0x2c7/0x460
Code: 5e 41 5f e9 8b ae ef ff e8 86 ae ef ff 65 8b 1d 2b 08 ac 7e 31 ff 89 de e8 26 ab ef ff 85 db 0f 84 8a 00 00 00 e8 69 ae ef ff <0f> 0b e9 a5 fe ff ff e8 5d ae ef ff 48 8d 7d 10 48 b8 00 00 00 00
RSP: 0000:ffff888040a378a8 EFLAGS: 00010006
RAX: 0000000040000002 RBX: 0000000000000000 RCX: 0000000000000000
RDX: ffff88800ce6b580 RSI: ffffffff81566da7 RDI: 0000000000000005
RBP: ffff888040ac05c8 R08: 0000000000000005 R09: 0000000000000001
R10: 0000000000000000 R11: 0000000000000001 R12: ffff88801761a000
R13: ffff88806cf3d2c0 R14: ffffffff8547d1a0 R15: 0000000000000002
ctx_sched_out+0x8f1/0xc10
__perf_event_task_sched_out+0x6d0/0x18d0
__schedule+0xedd/0x2470
preempt_schedule_common+0x45/0xc0
__cond_resched+0x17/0x30
prepare_alloc_pages+0x33f/0x500
__alloc_pages+0x145/0x500
vma_alloc_folio+0xde/0x470
__handle_mm_fault+0x1025/0x35e0
handle_mm_fault+0x2e6/0xa20
do_user_addr_fault+0x536/0x1300
exc_page_fault+0x98/0x1a0
asm_exc_page_fault+0x22/0x30
RIP: 0033:0x7f91174e0361
Code: 3d 5c 8b 0a 00 e8 5f c3 ff ff 66 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 41 57 41 56 41 55 41 54 55 53 48 81 ec 98 01 00 00 <48> 89 7c 24 38 48 89 74 24 30 48 89 54 24 28 48 89 4c 24 20 4c 89
RSP: 002b:00007f9114ab3fb0 EFLAGS: 00010202
RAX: 00007f91174e0350 RBX: 00007f9117651f60 RCX: 0000000000000002
RDX: 0000000000000000 RSI: 00000000200000c0 RDI: 0000000020000000
RBP: 00007f9117598f6d R08: 0000000020000040 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000036548 R12: 0000000000000000
R13: 00007fff42b37a4f R14: 00007f9114ab4300 R15: 0000000000022000
WARNING: CPU: 1 PID: 3688 at kernel/events/core.c:2309 group_sched_out.part.0+0x2c7/0x460
Modules linked in:
CPU: 1 PID: 3688 Comm: syz-executor.4 Not tainted 6.0.0-next-20221005 #1
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014
RIP: 0010:group_sched_out.part.0+0x2c7/0x460
Code: 5e 41 5f e9 8b ae ef ff e8 86 ae ef ff 65 8b 1d 2b 08 ac 7e 31 ff 89 de e8 26 ab ef ff 85 db 0f 84 8a 00 00 00 e8 69 ae ef ff <0f> 0b e9 a5 fe ff ff e8 5d ae ef ff 48 8d 7d 10 48 b8 00 00 00 00
RSP: 0000:ffff888040a378a8 EFLAGS: 00010006
RAX: 0000000040000002 RBX: 0000000000000000 RCX: 0000000000000000
RDX: ffff88800ce6b580 RSI: ffffffff81566da7 RDI: 0000000000000005
RBP: ffff888040ac05c8 R08: 0000000000000005 R09: 0000000000000001
R10: 0000000000000000 R11: 0000000000000001 R12: ffff88801761a000
R13: ffff88806cf3d2c0 R14: ffffffff8547d1a0 R15: 0000000000000002
FS: 00007f9114ab4700(0000) GS:ffff88806cf00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f9114ab3fe8 CR3: 000000003fe18000 CR4: 0000000000350ee0
Call Trace:
ctx_sched_out+0x8f1/0xc10
__perf_event_task_sched_out+0x6d0/0x18d0
__schedule+0xedd/0x2470
preempt_schedule_common+0x45/0xc0
__cond_resched+0x17/0x30
prepare_alloc_pages+0x33f/0x500
__alloc_pages+0x145/0x500
vma_alloc_folio+0xde/0x470
__handle_mm_fault+0x1025/0x35e0
handle_mm_fault+0x2e6/0xa20
do_user_addr_fault+0x536/0x1300
exc_page_fault+0x98/0x1a0
asm_exc_page_fault+0x22/0x30
RIP: 0033:0x7f91174e0361
Code: 3d 5c 8b 0a 00 e8 5f c3 ff ff 66 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 41 57 41 56 41 55 41 54 55 53 48 81 ec 98 01 00 00 <48> 89 7c 24 38 48 89 74 24 30 48 89 54 24 28 48 89 4c 24 20 4c 89
RSP: 002b:00007f9114ab3fb0 EFLAGS: 00010202
RAX: 00007f91174e0350 RBX: 00007f9117651f60 RCX: 0000000000000002
RDX: 0000000000000000 RSI: 00000000200000c0 RDI: 0000000020000000
RBP: 00007f9117598f6d R08: 0000000020000040 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000036548 R12: 0000000000000000
R13: 00007fff42b37a4f R14: 00007f9114ab4300 R15: 0000000000022000
irq event stamp: 1758
hardirqs last enabled at (1757): [] asm_sysvec_apic_timer_interrupt+0x16/0x20
hardirqs last disabled at (1758): [] __schedule+0x1225/0x2470
softirqs last enabled at (1756): [] __irq_exit_rcu+0x11b/0x180
softirqs last disabled at (1247): [] __irq_exit_rcu+0x11b/0x180
---[ end trace 0000000000000000 ]---
loop4: detected capacity change from 0 to 264192
audit: type=1400 audit(1665040333.605:9): avc: denied { block_suspend } for pid=3686 comm="syz-executor.4" capability=36 scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=capability2 permissive=1
FAT-fs (loop4): Invalid FSINFO signature: 0x00000000, 0x00000000 (sector = 1)
loop4: detected capacity change from 0 to 264192
FAT-fs (loop4): Invalid FSINFO signature: 0x00000000, 0x00000000 (sector = 1)
loop4: detected capacity change from 0 to 264192
FAT-fs (loop4): bogus number of reserved sectors
FAT-fs (loop4): Can't find a valid FAT filesystem
loop4: detected capacity change from 0 to 264192
FAT-fs (loop4): bogus number of reserved sectors
FAT-fs (loop4): Can't find a valid FAT filesystem
loop4: detected capacity change from 0 to 264192
FAT-fs (loop4): Invalid FSINFO signature: 0x00000000, 0x00000000 (sector = 1)
FAT-fs (loop2): bogus number of reserved sectors
FAT-fs (loop2): Can't find a valid FAT filesystem
FAT-fs (loop2): bogus number of reserved sectors
FAT-fs (loop2): Can't find a valid FAT filesystem
loop4: detected capacity change from 0 to 264192
FAT-fs (loop4): Invalid FSINFO signature: 0x00000000, 0x00000000 (sector = 1)