audit: type=1400 audit(1663598111.073:8): avc: denied { kernel } for pid=5750 comm="syz-executor.2" 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-rc6-next-20220919 #1 Not tainted
------------------------------------------------------
syz-executor.2/5759 is trying to acquire lock:
ffffffff853fa838 ((console_sem).lock){....}-{2:2}, at: down_trylock+0xe/0x70
but task is already holding lock:
ffff88800d22d820 (&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
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
group_sched_out.part.0+0x2c7/0x460
ctx_sched_out+0x8f1/0xc10
__perf_event_task_sched_out+0x6d0/0x18d0
__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
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 ***
2 locks held by syz-executor.2/5759:
#0: ffff88806cf37d18 (&rq->__lock){-.-.}-{2:2}, at: __schedule+0x1cf/0x2470
#1: ffff88800d22d820 (&ctx->lock){....}-{2:2}, at: __perf_event_task_sched_out+0x53b/0x18d0
stack backtrace:
CPU: 1 PID: 5759 Comm: syz-executor.2 Not tainted 6.0.0-rc6-next-20220919 #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:group_sched_out.part.0+0x2c7/0x460
Code: 5e 41 5f e9 3b b7 ef ff e8 36 b7 ef ff 65 8b 1d 5b 15 ac 7e 31 ff 89 de e8 d6 b3 ef ff 85 db 0f 84 8a 00 00 00 e8 19 b7 ef ff <0f> 0b e9 a5 fe ff ff e8 0d b7 ef ff 48 8d 7d 10 48 b8 00 00 00 00
RSP: 0018:ffff8880418ffc48 EFLAGS: 00010006
RAX: 0000000040000002 RBX: 0000000000000000 RCX: 0000000000000000
RDX: ffff88801dbcd040 RSI: ffffffff81566077 RDI: 0000000000000005
RBP: ffff88801dbb0000 R08: 0000000000000005 R09: 0000000000000001
R10: 0000000000000000 R11: ffffffff865ac05b R12: ffff88800d22d800
R13: ffff88806cf3d140 R14: ffffffff8547c780 R15: 0000000000000002
ctx_sched_out+0x8f1/0xc10
__perf_event_task_sched_out+0x6d0/0x18d0
__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
RIP: 0033:0x7fb0b3f90b19
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:00007fb0b1506218 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: 0000000000000001 RBX: 00007fb0b40a3f68 RCX: 00007fb0b3f90b19
RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 00007fb0b40a3f6c
RBP: 00007fb0b40a3f60 R08: 000000000000000e R09: 0000000000000000
R10: 0000000000000003 R11: 0000000000000246 R12: 00007fb0b40a3f6c
R13: 00007ffe94c9786f R14: 00007fb0b1506300 R15: 0000000000022000
WARNING: CPU: 1 PID: 5759 at kernel/events/core.c:2309 group_sched_out.part.0+0x2c7/0x460
Modules linked in:
CPU: 1 PID: 5759 Comm: syz-executor.2 Not tainted 6.0.0-rc6-next-20220919 #1
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.14.0-0-g155821a1990b-prebuilt.qemu.org 04/01/2014
RIP: 0010:group_sched_out.part.0+0x2c7/0x460
Code: 5e 41 5f e9 3b b7 ef ff e8 36 b7 ef ff 65 8b 1d 5b 15 ac 7e 31 ff 89 de e8 d6 b3 ef ff 85 db 0f 84 8a 00 00 00 e8 19 b7 ef ff <0f> 0b e9 a5 fe ff ff e8 0d b7 ef ff 48 8d 7d 10 48 b8 00 00 00 00
RSP: 0018:ffff8880418ffc48 EFLAGS: 00010006
RAX: 0000000040000002 RBX: 0000000000000000 RCX: 0000000000000000
RDX: ffff88801dbcd040 RSI: ffffffff81566077 RDI: 0000000000000005
RBP: ffff88801dbb0000 R08: 0000000000000005 R09: 0000000000000001
R10: 0000000000000000 R11: ffffffff865ac05b R12: ffff88800d22d800
R13: ffff88806cf3d140 R14: ffffffff8547c780 R15: 0000000000000002
FS: 00007fb0b1506700(0000) GS:ffff88806cf00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f186a5e6650 CR3: 0000000032054000 CR4: 0000000000350ee0
Call Trace:
ctx_sched_out+0x8f1/0xc10
__perf_event_task_sched_out+0x6d0/0x18d0
__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
RIP: 0033:0x7fb0b3f90b19
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:00007fb0b1506218 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: 0000000000000001 RBX: 00007fb0b40a3f68 RCX: 00007fb0b3f90b19
RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 00007fb0b40a3f6c
RBP: 00007fb0b40a3f60 R08: 000000000000000e R09: 0000000000000000
R10: 0000000000000003 R11: 0000000000000246 R12: 00007fb0b40a3f6c
R13: 00007ffe94c9786f R14: 00007fb0b1506300 R15: 0000000000022000
irq event stamp: 750
hardirqs last enabled at (749): [] exit_to_user_mode_prepare+0x109/0x1a0
hardirqs last disabled at (750): [] __schedule+0x1225/0x2470
softirqs last enabled at (696): [] __irq_exit_rcu+0x11b/0x180
softirqs last disabled at (691): [] __irq_exit_rcu+0x11b/0x180
---[ end trace 0000000000000000 ]---
audit: type=1401 audit(1663598111.103:9): op=setxattr invalid_context=""
hrtimer: interrupt took 25598 ns
audit: type=1401 audit(1663598111.659:10): op=setxattr invalid_context=""
audit: type=1401 audit(1663598111.800:11): op=setxattr invalid_context=""
audit: type=1401 audit(1663598112.235:12): op=setxattr invalid_context=""
device syz_tun entered promiscuous mode
device syz_tun left promiscuous mode
device syz_tun entered promiscuous mode
device syz_tun left promiscuous mode
loop2: detected capacity change from 0 to 264192
loop3: detected capacity change from 0 to 1024
EXT4-fs (loop3): mounted filesystem without journal. Quota mode: none.
ext4 filesystem being mounted at /syzkaller-testdir477037893/syzkaller.ZnAmr9/7/file0 supports timestamps until 2038 (0x7fffffff)
EXT4-fs (loop3): unmounting filesystem.
loop2: detected capacity change from 0 to 264192
loop3: detected capacity change from 0 to 264192
loop3: detected capacity change from 0 to 264192
loop3: detected capacity change from 0 to 264192
loop2: detected capacity change from 0 to 264192
loop2: detected capacity change from 0 to 264192
capability: warning: `syz-executor.4' uses deprecated v2 capabilities in a way that may be insecure
9pnet_fd: p9_fd_create_tcp (5970): problem connecting socket to 127.0.0.1
9pnet_fd: p9_fd_create_tcp (5980): problem connecting socket to 127.0.0.1
syz-executor.1 (5965) used greatest stack depth: 24728 bytes left
9pnet_fd: p9_fd_create_tcp (5991): problem connecting socket to 127.0.0.1
9pnet_fd: p9_fd_create_tcp (6006): problem connecting socket to 127.0.0.1
9pnet_fd: p9_fd_create_tcp (6008): problem connecting socket to 127.0.0.1
9pnet_fd: p9_fd_create_tcp (6019): problem connecting socket to 127.0.0.1
9pnet_fd: p9_fd_create_tcp (6001): problem connecting socket to 127.0.0.1
9pnet_fd: p9_fd_create_tcp (6010): problem connecting socket to 127.0.0.1
9pnet_fd: p9_fd_create_tcp (6029): problem connecting socket to 127.0.0.1
9pnet_fd: p9_fd_create_tcp (6038): problem connecting socket to 127.0.0.1
9pnet_fd: p9_fd_create_tcp (6036): problem connecting socket to 127.0.0.1
9pnet_fd: p9_fd_create_tcp (6055): problem connecting socket to 127.0.0.1
9pnet_fd: p9_fd_create_tcp (6056): problem connecting socket to 127.0.0.1
9pnet_fd: p9_fd_create_tcp (6059): problem connecting socket to 127.0.0.1
9pnet_fd: p9_fd_create_tcp (6053): problem connecting socket to 127.0.0.1
netlink: 28 bytes leftover after parsing attributes in process `syz-executor.4'.
9pnet_fd: p9_fd_create_tcp (6067): problem connecting socket to 127.0.0.1
9pnet_fd: p9_fd_create_tcp (6073): problem connecting socket to 127.0.0.1
netlink: 28 bytes leftover after parsing attributes in process `syz-executor.5'.
netlink: 28 bytes leftover after parsing attributes in process `syz-executor.4'.
9pnet_fd: p9_fd_create_tcp (6101): problem connecting socket to 127.0.0.1
netlink: 28 bytes leftover after parsing attributes in process `syz-executor.3'.
netlink: 28 bytes leftover after parsing attributes in process `syz-executor.2'.
9pnet_fd: p9_fd_create_tcp (6103): problem connecting socket to 127.0.0.1
netlink: 28 bytes leftover after parsing attributes in process `syz-executor.4'.
netlink: 28 bytes leftover after parsing attributes in process `syz-executor.5'.
netlink: 28 bytes leftover after parsing attributes in process `syz-executor.4'.
netlink: 28 bytes leftover after parsing attributes in process `syz-executor.1'.
netlink: 28 bytes leftover after parsing attributes in process `syz-executor.2'.
9pnet_fd: p9_fd_create_tcp (6120): problem connecting socket to 127.0.0.1
9pnet_fd: p9_fd_create_tcp (6129): problem connecting socket to 127.0.0.1
9pnet_fd: p9_fd_create_tcp (6100): problem connecting socket to 127.0.0.1
9pnet_fd: p9_fd_create_tcp (6136): problem connecting socket to 127.0.0.1
audit: type=1400 audit(1663598117.285:13): avc: denied { write } for pid=6190 comm="syz-executor.1" scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=perf_event permissive=1
audit: type=1400 audit(1663598118.688:14): avc: denied { relabelto } for pid=6312 comm="syz-executor.4" name="NETLINK" dev="sockfs" ino=16945 scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:object_r:printer_device_t:s0 tclass=netlink_generic_socket permissive=1
audit: type=1400 audit(1663598118.731:15): avc: denied { tracepoint } for pid=6321 comm="syz-executor.3" scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=perf_event permissive=1
syz-executor.0 (6338) used greatest stack depth: 24472 bytes left
syz-executor.5 (6372) used greatest stack depth: 23576 bytes left
audit: type=1326 audit(1663598121.104:16): auid=0 uid=0 gid=0 ses=4 subj=system_u:system_r:kernel_t:s0 pid=6440 comm="syz-executor.2" exe="/syz-executor.2" sig=31 arch=c000003e syscall=202 compat=0 ip=0x7fb0b3f90b19 code=0x0