rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 0-...!: (10489 ticks this GP) idle=be6/1/0x4000000000000000 softirq=245602/245610 fqs=5
(t=10501 jiffies g=474613 q=43)
rcu: rcu_preempt kthread starved for 10486 jiffies! g474613 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=1
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:27680 pid: 14 ppid: 2 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:4681 [inline]
__schedule+0x93a/0x26f0 kernel/sched/core.c:5938
schedule+0xd3/0x270 kernel/sched/core.c:6017
schedule_timeout+0x14a/0x2a0 kernel/time/timer.c:1881
rcu_gp_fqs_loop kernel/rcu/tree.c:1996 [inline]
rcu_gp_kthread+0xd34/0x1980 kernel/rcu/tree.c:2169
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:
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 15739 Comm: syz-executor.1 Not tainted 5.14.0-rc7-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:timerqueue_del+0x94/0x140 lib/timerqueue.c:58
Code: 39 5d 08 74 54 e8 4c b8 82 fd 48 89 ee 48 89 df e8 e1 51 ff ff 48 89 da 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 80 3c 02 00 <75> 63 48 b8 00 00 00 00 00 fc ff df 48 89 ea 48 89 1b 48 c1 ea 03
RSP: 0018:ffffc90000dc0dc8 EFLAGS: 00000046
RAX: dffffc0000000000 RBX: ffff8880885898c8 RCX: 0000000000000000
RDX: 1ffff110110b1319 RSI: ffff8880b9d424d0 RDI: ffff8880b9d42df0
RBP: ffff8880b9d424d0 R08: ffff8880b9d42de0 R09: 0000000000000001
R10: ffffffff83f2f25c R11: 0000000000000000 R12: ffff8880b9d424d8
R13: 0000000000000000 R14: ffff8880b9d42400 R15: 0000000000000000
FS: 00007f66c3435700(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f240fbe0070 CR3: 000000008c19c000 CR4: 00000000001506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
__remove_hrtimer+0xa1/0x2a0 kernel/time/hrtimer.c:1014
__run_hrtimer kernel/time/hrtimer.c:1517 [inline]
__hrtimer_run_queues+0x4ea/0xe50 kernel/time/hrtimer.c:1601
hrtimer_interrupt+0x330/0xa00 kernel/time/hrtimer.c:1663
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1089 [inline]
__sysvec_apic_timer_interrupt+0x146/0x530 arch/x86/kernel/apic/apic.c:1106
sysvec_apic_timer_interrupt+0x8e/0xc0 arch/x86/kernel/apic/apic.c:1100
asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:638
RIP: 0010:trylock_clear_pending kernel/locking/qspinlock_paravirt.h:121 [inline]
RIP: 0010:pv_wait_head_or_lock kernel/locking/qspinlock_paravirt.h:435 [inline]
RIP: 0010:__pv_queued_spin_lock_slowpath+0x3d9/0xb40 kernel/locking/qspinlock.c:508
Code: fc ff df 4c 8d 2c 01 eb 0c f3 90 41 83 ec 01 0f 84 72 04 00 00 41 0f b6 45 00 38 d8 7f 08 84 c0 0f 85 91 05 00 00 0f b6 45 00 <84> c0 75 db be 02 00 00 00 48 89 ef e8 76 ce 60 00 b8 00 01 00 00
RSP: 0018:ffffc900016df528 EFLAGS: 00000246
RAX: 0000000000000003 RBX: 0000000000000000 RCX: 1ffff1100502ea78
RDX: 0000000000000001 RSI: ffffffff817bd431 RDI: ffffffff81332591
RBP: ffff8880281753c0 R08: 0000000000000001 R09: 0000000000000001
R10: ffffffff817bd3f9 R11: 0000000000000000 R12: 000000000000608a
R13: ffffed100502ea78 R14: 0000000000000001 R15: ffff8880b9d52840
pv_queued_spin_lock_slowpath arch/x86/include/asm/paravirt.h:585 [inline]
queued_spin_lock_slowpath arch/x86/include/asm/qspinlock.h:51 [inline]
queued_spin_lock include/asm-generic/qspinlock.h:85 [inline]
do_raw_spin_lock+0x200/0x2b0 kernel/locking/spinlock_debug.c:113
spin_lock include/linux/spinlock.h:354 [inline]
ext4_lock_group+0x1e5/0x240 fs/ext4/ext4.h:3456
ext4_discard_preallocations+0x5d3/0xee0 fs/ext4/mballoc.c:4957
ext4_truncate+0x63b/0x1440 fs/ext4/inode.c:4259
ext4_setattr+0x12c8/0x2000 fs/ext4/inode.c:5504
notify_change+0xb28/0x10f0 fs/attr.c:398
do_truncate+0x13c/0x200 fs/open.c:64
handle_truncate fs/namei.c:3030 [inline]
do_open fs/namei.c:3378 [inline]
path_openat+0x20f4/0x27f0 fs/namei.c:3507
do_filp_open+0x1aa/0x400 fs/namei.c:3534
do_sys_openat2+0x16d/0x420 fs/open.c:1204
do_sys_open fs/open.c:1220 [inline]
__do_sys_openat fs/open.c:1236 [inline]
__se_sys_openat fs/open.c:1231 [inline]
__x64_sys_openat+0x13f/0x1f0 fs/open.c:1231
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: 0033:0x4665f9
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:00007f66c3435188 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 000000000056bf80 RCX: 00000000004665f9
RDX: 0000000000007a43 RSI: 0000000020000140 RDI: ffffffffffffff9c
RBP: 00000000004bfcc4 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000001700 R11: 0000000000000246 R12: 000000000056bf80
R13: 00007ffcd89c960f R14: 00007f66c3435300 R15: 0000000000022000
NMI backtrace for cpu 0
CPU: 0 PID: 15736 Comm: syz-executor.0 Not tainted 5.14.0-rc7-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:105
nmi_cpu_backtrace.cold+0x44/0xd7 lib/nmi_backtrace.c:105
nmi_trigger_cpumask_backtrace+0x1b3/0x230 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:342
print_cpu_stall kernel/rcu/tree_stall.h:625 [inline]
check_cpu_stall kernel/rcu/tree_stall.h:700 [inline]
rcu_pending kernel/rcu/tree.c:3922 [inline]
rcu_sched_clock_irq.cold+0x9f/0x747 kernel/rcu/tree.c:2641
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:1537 [inline]
__hrtimer_run_queues+0x1c0/0xe50 kernel/time/hrtimer.c:1601
hrtimer_interrupt+0x330/0xa00 kernel/time/hrtimer.c:1663
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1089 [inline]
__sysvec_apic_timer_interrupt+0x146/0x530 arch/x86/kernel/apic/apic.c:1106
sysvec_apic_timer_interrupt+0x40/0xc0 arch/x86/kernel/apic/apic.c:1100
asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:638
RIP: 0010:mac80211_hwsim_tx_frame_no_nl.isra.0+0x77b/0x1330 drivers/net/wireless/mac80211_hwsim.c:1527
Code: 00 00 00 c6 84 24 98 00 00 00 00 74 bb e8 5d 6f 42 fc 48 8d bb ac 3c 00 00 48 89 f8 48 89 fa 48 c1 e8 03 83 e2 07 0f b6 04 28 <38> d0 7f 08 84 c0 0f 85 36 09 00 00 44 0f b6 bb ac 3c 00 00 31 ff
RSP: 0018:ffffc90000007ba0 EFLAGS: 00000202
RAX: 0000000000000000 RBX: ffff88807fe132a0 RCX: 0000000000000100
RDX: 0000000000000004 RSI: ffffffff85333b83 RDI: ffff88807fe16f4c
RBP: dffffc0000000000 R08: 0000000000000003 R09: 0000000000000000
R10: ffffffff85333bb9 R11: 0000000000000000 R12: ffff8880179a9000
R13: ffff88806cd7b4d0 R14: ffff88806cd7b2a0 R15: 0000000000000000
mac80211_hwsim_tx_frame+0x1ee/0x2a0 drivers/net/wireless/mac80211_hwsim.c:1784
mac80211_hwsim_beacon_tx+0x49b/0x930 drivers/net/wireless/mac80211_hwsim.c:1838
__iterate_interfaces+0x1e5/0x520 net/mac80211/util.c:793
ieee80211_iterate_active_interfaces_atomic+0x70/0x180 net/mac80211/util.c:829
mac80211_hwsim_beacon+0xd5/0x1a0 drivers/net/wireless/mac80211_hwsim.c:1861
__run_hrtimer kernel/time/hrtimer.c:1537 [inline]
__hrtimer_run_queues+0x609/0xe50 kernel/time/hrtimer.c:1601
hrtimer_run_softirq+0x17b/0x360 kernel/time/hrtimer.c:1618
__do_softirq+0x29b/0x9c2 kernel/softirq.c:558
invoke_softirq kernel/softirq.c:432 [inline]
__irq_exit_rcu+0x16e/0x1c0 kernel/softirq.c:636
irq_exit_rcu+0x5/0x20 kernel/softirq.c:648
sysvec_apic_timer_interrupt+0x93/0xc0 arch/x86/kernel/apic/apic.c:1100
asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:638
RIP: 0010:ext4_mb_mark_diskspace_used+0x7cc/0x1230 fs/ext4/mballoc.c:3790
Code: c8 a7 ff 48 8b 54 24 20 4c 89 f7 8b 73 38 e8 eb ae 0b 00 48 8b 54 24 08 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 0f b6 04 02 <84> c0 74 0e 3c 03 7f 0a 48 8b 7c 24 08 e8 82 c8 a7 ff 48 b8 00 00
RSP: 0018:ffffc900017af070 EFLAGS: 00000a02
RAX: 0000000000000000 RBX: ffff88808938e000 RCX: ffffc90002192000
RDX: 1ffff11011271c07 RSI: ffffffff82148765 RDI: ffff8881487413de
RBP: ffff88801a1dd000 R08: 0000000000000000 R09: 00000000ff9d4101
R10: ffffffff821f604c R11: 0000000000000000 R12: 0000000000000005
R13: 1ffff920002f5e18 R14: ffff88802829c000 R15: ffff88808938e03c
ext4_mb_new_blocks+0xd30/0x5230 fs/ext4/mballoc.c:5533
ext4_new_meta_blocks+0x2fe/0x360 fs/ext4/balloc.c:693
ext4_alloc_branch fs/ext4/indirect.c:335 [inline]
ext4_ind_map_blocks+0xb0d/0x2440 fs/ext4/indirect.c:626
ext4_map_blocks+0x9c9/0x17d0 fs/ext4/inode.c:640
ext4_iomap_alloc fs/ext4/inode.c:3426 [inline]
ext4_iomap_begin+0x4a1/0x7f0 fs/ext4/inode.c:3476
iomap_apply+0x177/0xb50 fs/iomap/apply.c:46
__iomap_dio_rw+0x725/0x1300 fs/iomap/direct-io.c:561
iomap_dio_rw+0x30/0x90 fs/iomap/direct-io.c:649
ext4_dio_write_iter fs/ext4/file.c:568 [inline]
ext4_file_write_iter+0xe18/0x14e0 fs/ext4/file.c:678
call_write_iter include/linux/fs.h:2114 [inline]
new_sync_write+0x426/0x650 fs/read_write.c:518
vfs_write+0x75a/0xa40 fs/read_write.c:605
ksys_write+0x12d/0x250 fs/read_write.c:658
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: 0033:0x4665f9
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:00007f435b8e8188 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 000000000056bf80 RCX: 00000000004665f9
RDX: 0000000000248800 RSI: 0000000020000000 RDI: 0000000000000004
RBP: 00000000004bfcc4 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf80
R13: 00007ffefd12f74f R14: 00007f435b8e8300 R15: 0000000000022000
----------------
Code disassembly (best guess):
0: 39 5d 08 cmp %ebx,0x8(%rbp)
3: 74 54 je 0x59
5: e8 4c b8 82 fd callq 0xfd82b856
a: 48 89 ee mov %rbp,%rsi
d: 48 89 df mov %rbx,%rdi
10: e8 e1 51 ff ff callq 0xffff51f6
15: 48 89 da mov %rbx,%rdx
18: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax
1f: fc ff df
22: 48 c1 ea 03 shr $0x3,%rdx
26: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1)
* 2a: 75 63 jne 0x8f <-- trapping instruction
2c: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax
33: fc ff df
36: 48 89 ea mov %rbp,%rdx
39: 48 89 1b mov %rbx,(%rbx)
3c: 48 c1 ea 03 shr $0x3,%rdx