rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 0-...!: (10500 ticks this GP) idle=add/1/0x4000000000000000 softirq=62219/62219 fqs=0
(t=10500 jiffies g=111101 q=44)
rcu: rcu_preempt kthread starved for 10500 jiffies! g111101 f0x0 RCU_GP_INIT(4) ->state=0x0 ->cpu=0
rcu: Unless rcu_preempt kthread gets sufficient CPU time, OOM is now expected behavior.
rcu: RCU grace-period kthread stack dump:
task:rcu_preempt state:R running task stack:28952 pid: 14 ppid: 2 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:4940 [inline]
__schedule+0x940/0x26f0 kernel/sched/core.c:6287
preempt_schedule_common+0x45/0xc0 kernel/sched/core.c:6459
preempt_schedule_thunk+0x16/0x18 arch/x86/entry/thunk_64.S:35
__raw_spin_unlock_irq include/linux/spinlock_api_smp.h:169 [inline]
_raw_spin_unlock_irq+0x3c/0x40 kernel/locking/spinlock.c:202
rcu_gp_init+0x859/0x12a0 kernel/rcu/tree.c:1866
rcu_gp_kthread+0xab/0x320 kernel/rcu/tree.c:2120
kthread+0x3e5/0x4d0 kernel/kthread.c:319
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
rcu: Stack dump where RCU GP kthread last ran:
NMI backtrace for cpu 0
CPU: 0 PID: 30183 Comm: syz-executor.1 Not tainted 5.15.0-rc4-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106
nmi_cpu_backtrace.cold+0x47/0x144 lib/nmi_backtrace.c:105
nmi_trigger_cpumask_backtrace+0x1ae/0x220 lib/nmi_backtrace.c:62
trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline]
rcu_check_gp_kthread_starvation.cold+0x1fb/0x200 kernel/rcu/tree_stall.h:481
print_cpu_stall kernel/rcu/tree_stall.h:625 [inline]
check_cpu_stall kernel/rcu/tree_stall.h:711 [inline]
rcu_pending kernel/rcu/tree.c:3880 [inline]
rcu_sched_clock_irq.cold+0x98/0x746 kernel/rcu/tree.c:2599
update_process_times+0x16d/0x200 kernel/time/timer.c:1785
tick_sched_handle+0x9b/0x180 kernel/time/tick-sched.c:226
tick_sched_timer+0x1b0/0x2d0 kernel/time/tick-sched.c:1421
__run_hrtimer kernel/time/hrtimer.c:1685 [inline]
__hrtimer_run_queues+0x1c0/0xe50 kernel/time/hrtimer.c:1749
hrtimer_interrupt+0x31c/0x790 kernel/time/hrtimer.c:1811
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1086 [inline]
__sysvec_apic_timer_interrupt+0x146/0x530 arch/x86/kernel/apic/apic.c:1103
sysvec_apic_timer_interrupt+0x8e/0xc0 arch/x86/kernel/apic/apic.c:1097
asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:638
RIP: 0010:kfree+0x137/0x2c0 mm/slab.c:3805
Code: 0e 4c 89 ea 48 89 ee 4c 89 e7 e8 d4 f8 ff ff 48 85 db 0f 85 a6 00 00 00 9c 58 f6 c4 02 0f 85 74 01 00 00 48 85 db 74 01 fb 5b <5d> 41 5c 41 5d c3 65 8b 05 44 05 46 7e 83 f8 07 0f 87 61 01 00 00
RSP: 0018:ffffc900046d78a0 EFLAGS: 00000206
RAX: 0000000000000006 RBX: fffffffffffffff5 RCX: 1ffffffff1adbf69
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffff88807d4a0ac0 R08: 0000000000000001 R09: 0000000000000001
R10: ffffffff817b5f48 R11: 0000000000086089 R12: ffff888010c40100
R13: ffffffff842e7d50 R14: dffffc0000000000 R15: ffff88801f8df300
tty_free_file drivers/tty/tty_io.c:220 [inline]
tty_open+0x7e0/0x1000 drivers/tty/tty_io.c:2149
chrdev_open+0x266/0x770 fs/char_dev.c:414
do_dentry_open+0x4c8/0x11d0 fs/open.c:822
do_open fs/namei.c:3428 [inline]
path_openat+0x1c9a/0x2740 fs/namei.c:3561
do_filp_open+0x1aa/0x400 fs/namei.c:3588
do_sys_openat2+0x16d/0x4d0 fs/open.c:1200
do_sys_open fs/open.c:1216 [inline]
__do_sys_openat fs/open.c:1232 [inline]
__se_sys_openat fs/open.c:1227 [inline]
__x64_sys_openat+0x13f/0x1f0 fs/open.c:1227
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7f6e688c78d9
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:00007f6e65e3e188 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007f6e689cbf60 RCX: 00007f6e688c78d9
RDX: 0000000000000802 RSI: 0000000020000840 RDI: ffffffffffffff9c
RBP: 00007f6e68921cb4 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffe0af35fdf R14: 00007f6e65e3e300 R15: 0000000000022000
NMI backtrace for cpu 0
CPU: 0 PID: 30183 Comm: syz-executor.1 Not tainted 5.15.0-rc4-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106
nmi_cpu_backtrace.cold+0x47/0x144 lib/nmi_backtrace.c:105
nmi_trigger_cpumask_backtrace+0x1ae/0x220 lib/nmi_backtrace.c:62
trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline]
rcu_dump_cpu_stacks+0x25e/0x3f0 kernel/rcu/tree_stall.h:343
print_cpu_stall kernel/rcu/tree_stall.h:627 [inline]
check_cpu_stall kernel/rcu/tree_stall.h:711 [inline]
rcu_pending kernel/rcu/tree.c:3880 [inline]
rcu_sched_clock_irq.cold+0x9d/0x746 kernel/rcu/tree.c:2599
update_process_times+0x16d/0x200 kernel/time/timer.c:1785
tick_sched_handle+0x9b/0x180 kernel/time/tick-sched.c:226
tick_sched_timer+0x1b0/0x2d0 kernel/time/tick-sched.c:1421
__run_hrtimer kernel/time/hrtimer.c:1685 [inline]
__hrtimer_run_queues+0x1c0/0xe50 kernel/time/hrtimer.c:1749
hrtimer_interrupt+0x31c/0x790 kernel/time/hrtimer.c:1811
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1086 [inline]
__sysvec_apic_timer_interrupt+0x146/0x530 arch/x86/kernel/apic/apic.c:1103
sysvec_apic_timer_interrupt+0x8e/0xc0 arch/x86/kernel/apic/apic.c:1097
asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:638
RIP: 0010:kfree+0x137/0x2c0 mm/slab.c:3805
Code: 0e 4c 89 ea 48 89 ee 4c 89 e7 e8 d4 f8 ff ff 48 85 db 0f 85 a6 00 00 00 9c 58 f6 c4 02 0f 85 74 01 00 00 48 85 db 74 01 fb 5b <5d> 41 5c 41 5d c3 65 8b 05 44 05 46 7e 83 f8 07 0f 87 61 01 00 00
RSP: 0018:ffffc900046d78a0 EFLAGS: 00000206
RAX: 0000000000000006 RBX: fffffffffffffff5 RCX: 1ffffffff1adbf69
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffff88807d4a0ac0 R08: 0000000000000001 R09: 0000000000000001
R10: ffffffff817b5f48 R11: 0000000000086089 R12: ffff888010c40100
R13: ffffffff842e7d50 R14: dffffc0000000000 R15: ffff88801f8df300
tty_free_file drivers/tty/tty_io.c:220 [inline]
tty_open+0x7e0/0x1000 drivers/tty/tty_io.c:2149
chrdev_open+0x266/0x770 fs/char_dev.c:414
do_dentry_open+0x4c8/0x11d0 fs/open.c:822
do_open fs/namei.c:3428 [inline]
path_openat+0x1c9a/0x2740 fs/namei.c:3561
do_filp_open+0x1aa/0x400 fs/namei.c:3588
do_sys_openat2+0x16d/0x4d0 fs/open.c:1200
do_sys_open fs/open.c:1216 [inline]
__do_sys_openat fs/open.c:1232 [inline]
__se_sys_openat fs/open.c:1227 [inline]
__x64_sys_openat+0x13f/0x1f0 fs/open.c:1227
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7f6e688c78d9
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:00007f6e65e3e188 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007f6e689cbf60 RCX: 00007f6e688c78d9
RDX: 0000000000000802 RSI: 0000000020000840 RDI: ffffffffffffff9c
RBP: 00007f6e68921cb4 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffe0af35fdf R14: 00007f6e65e3e300 R15: 0000000000022000
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 30189 Comm: syz-executor.0 Not tainted 5.15.0-rc4-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:check_wait_context kernel/locking/lockdep.c:4689 [inline]
RIP: 0010:__lock_acquire+0x4f9/0x54a0 kernel/locking/lockdep.c:4965
Code: 41 0f b6 54 24 21 84 d2 0f 88 c2 0b 00 00 48 8d bd b9 00 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 f9 48 c1 e9 03 0f b6 04 01 <48> 89 f9 83 e1 07 38 c8 7f 08 84 c0 0f 85 a8 10 00 00 0f b6 85 b9
RSP: 0018:ffffc900047075c8 EFLAGS: 00000802
RAX: 0000000000000000 RBX: ffffffff904713d8 RCX: 1ffffffff1fa03bf
RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffffffff8fd01df9
RBP: ffffffff8fd01d40 R08: 0000000000000000 R09: ffffffff8fd01927
R10: fffffbfff1fa0324 R11: 000000000000003f R12: ffff88805427ebf8
R13: ffff88805427e200 R14: 0000000000040000 R15: 0000000000000002
FS: 00007fce3eb20700(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f68a2413000 CR3: 0000000037bfa000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
lock_acquire kernel/locking/lockdep.c:5625 [inline]
lock_acquire+0x1ab/0x510 kernel/locking/lockdep.c:5590
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
_raw_spin_lock_irqsave+0x39/0x50 kernel/locking/spinlock.c:162
__debug_check_no_obj_freed lib/debugobjects.c:980 [inline]
debug_check_no_obj_freed+0xc7/0x420 lib/debugobjects.c:1023
kfree+0xd1/0x2c0 mm/slab.c:3802
tty_free_file drivers/tty/tty_io.c:220 [inline]
tty_open+0x7e0/0x1000 drivers/tty/tty_io.c:2149
chrdev_open+0x266/0x770 fs/char_dev.c:414
do_dentry_open+0x4c8/0x11d0 fs/open.c:822
do_open fs/namei.c:3428 [inline]
path_openat+0x1c9a/0x2740 fs/namei.c:3561
do_filp_open+0x1aa/0x400 fs/namei.c:3588
do_sys_openat2+0x16d/0x4d0 fs/open.c:1200
do_sys_open fs/open.c:1216 [inline]
__do_sys_openat fs/open.c:1232 [inline]
__se_sys_openat fs/open.c:1227 [inline]
__x64_sys_openat+0x13f/0x1f0 fs/open.c:1227
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7fce415a98d9
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:00007fce3eb20188 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007fce416adf60 RCX: 00007fce415a98d9
RDX: 0000000000000802 RSI: 0000000020000840 RDI: ffffffffffffff9c
RBP: 00007fce41603cb4 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffcd03912bf R14: 00007fce3eb20300 R15: 0000000000022000
sched: RT throttling activated
----------------
Code disassembly (best guess), 1 bytes skipped:
0: 4c 89 ea mov %r13,%rdx
3: 48 89 ee mov %rbp,%rsi
6: 4c 89 e7 mov %r12,%rdi
9: e8 d4 f8 ff ff callq 0xfffff8e2
e: 48 85 db test %rbx,%rbx
11: 0f 85 a6 00 00 00 jne 0xbd
17: 9c pushfq
18: 58 pop %rax
19: f6 c4 02 test $0x2,%ah
1c: 0f 85 74 01 00 00 jne 0x196
22: 48 85 db test %rbx,%rbx
25: 74 01 je 0x28
27: fb sti
28: 5b pop %rbx
* 29: 5d pop %rbp <-- trapping instruction
2a: 41 5c pop %r12
2c: 41 5d pop %r13
2e: c3 retq
2f: 65 8b 05 44 05 46 7e mov %gs:0x7e460544(%rip),%eax # 0x7e46057a
36: 83 f8 07 cmp $0x7,%eax
39: 0f 87 61 01 00 00 ja 0x1a0