rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 0-...!: (1 GPs behind) idle=ac3/1/0x4000000000000000 softirq=51825/51826 fqs=1
(t=10502 jiffies g=82893 q=42)
rcu: rcu_preempt kthread starved for 10501 jiffies! g82893 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:28712 pid: 14 ppid: 2 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:4972 [inline]
__schedule+0xa9a/0x4900 kernel/sched/core.c:6253
schedule+0xd2/0x260 kernel/sched/core.c:6326
schedule_timeout+0x14a/0x2a0 kernel/time/timer.c:1881
rcu_gp_fqs_loop+0x186/0x810 kernel/rcu/tree.c:1955
rcu_gp_kthread+0x1de/0x320 kernel/rcu/tree.c:2128
kthread+0x405/0x4f0 kernel/kthread.c:327
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: 18078 Comm: syz-executor.3 Not tainted 5.16.0-rc7-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:strlen+0x43/0x90 lib/string.c:487
Code: 08 0f b6 04 02 48 89 fa 83 e2 07 38 d0 7f 04 84 c0 75 48 80 7d 00 00 74 39 48 bb 00 00 00 00 00 fc ff df 48 89 e8 48 83 c0 01 <48> 89 c2 48 89 c1 48 c1 ea 03 83 e1 07 0f b6 14 1a 38 ca 7f 04 84
RSP: 0018:ffffc90000fd88e8 EFLAGS: 00000086
RAX: ffffffff89ad510a RBX: dffffc0000000000 RCX: 0000000000000001
RDX: 0000000000000006 RSI: ffffffff8bb812a0 RDI: ffffffff89ad5100
RBP: ffffffff89ad5100 R08: 0000000000000002 R09: 0000000000000000
R10: fffffbfff1b223b2 R11: 0000000000000000 R12: 0000000000000002
R13: ffffffff8ba7e660 R14: ffffffff8bb812a0 R15: ffffc90000fd89c8
FS: 00007fd5bfeaa700(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2ec37000 CR3: 00000000790f5000 CR4: 00000000003526e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
strlen include/linux/fortify-string.h:102 [inline]
trace_event_get_offsets_lock_acquire include/trace/events/lock.h:13 [inline]
perf_trace_lock_acquire+0xbe/0x550 include/trace/events/lock.h:13
trace_lock_acquire include/trace/events/lock.h:13 [inline]
lock_acquire+0x416/0x510 kernel/locking/lockdep.c:5608
rcu_lock_acquire include/linux/rcupdate.h:268 [inline]
rcu_read_lock include/linux/rcupdate.h:688 [inline]
__perf_event_output kernel/events/core.c:7485 [inline]
perf_event_output_forward+0xa5/0x280 kernel/events/core.c:7507
__perf_event_overflow+0x13c/0x3d0 kernel/events/core.c:9207
perf_swevent_hrtimer+0x37c/0x3f0 kernel/events/core.c:10600
__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:queued_write_lock_slowpath+0x13b/0x2c0 kernel/locking/qrwlock.c:78
Code: fc ff df 49 01 c7 41 83 c6 03 41 0f b6 07 41 38 c6 7c 08 84 c0 0f 85 3e 01 00 00 8b 03 3d 00 01 00 00 74 19 f3 90 41 0f b6 07 <41> 38 c6 7c ec 84 c0 74 e8 48 89 df e8 94 9f 60 00 eb de 48 89 df
RSP: 0018:ffffc900031b71d0 EFLAGS: 00000206
RAX: 0000000000000000 RBX: ffff88814af720c0 RCX: ffffffff815c5e7f
RDX: ffffed10295ee419 RSI: 0000000000000004 RDI: ffff88814af720c0
RBP: 1ffff92000636e3b R08: 0000000000000001 R09: ffff88814af720c3
R10: ffffed10295ee418 R11: 0000000000000001 R12: ffff88814af720c4
R13: 00000000000000ff R14: 0000000000000003 R15: ffffed10295ee418
queued_write_lock include/asm-generic/qrwlock.h:97 [inline]
do_raw_write_lock+0x1ce/0x280 kernel/locking/spinlock_debug.c:210
jbd2_log_start_commit+0x1f/0x40 fs/jbd2/journal.c:525
jbd2_journal_stop+0x502/0xf20 fs/jbd2/transaction.c:1913
__ext4_journal_stop+0xde/0x1f0 fs/ext4/ext4_jbd2.c:127
ext4_dirty_inode+0xe8/0x110 fs/ext4/inode.c:5920
__mark_inode_dirty+0x45b/0xfe0 fs/fs-writeback.c:2399
mark_inode_dirty include/linux/fs.h:2451 [inline]
generic_write_end+0x31b/0x500 fs/buffer.c:2202
ext4_da_write_end+0x1c2/0x990 fs/ext4/inode.c:3059
generic_perform_write+0x2c6/0x510 mm/filemap.c:3765
ext4_buffered_write_iter+0x1ac/0x3b0 fs/ext4/file.c:269
ext4_file_write_iter+0x423/0x14e0 fs/ext4/file.c:681
call_write_iter include/linux/fs.h:2162 [inline]
do_iter_readv_writev+0x472/0x750 fs/read_write.c:725
do_iter_write+0x188/0x710 fs/read_write.c:851
vfs_iter_write+0x70/0xa0 fs/read_write.c:892
iter_file_splice_write+0x6fa/0xc10 fs/splice.c:689
do_splice_from fs/splice.c:767 [inline]
direct_splice_actor+0x110/0x180 fs/splice.c:936
splice_direct_to_actor+0x34b/0x8c0 fs/splice.c:891
do_splice_direct+0x1b3/0x280 fs/splice.c:979
do_sendfile+0xaf2/0x1250 fs/read_write.c:1245
__do_sys_sendfile64 fs/read_write.c:1310 [inline]
__se_sys_sendfile64 fs/read_write.c:1296 [inline]
__x64_sys_sendfile64+0x1cc/0x210 fs/read_write.c:1296
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: 0033:0x7fd5c1534e99
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:00007fd5bfeaa168 EFLAGS: 00000246 ORIG_RAX: 0000000000000028
RAX: ffffffffffffffda RBX: 00007fd5c1647f60 RCX: 00007fd5c1534e99
RDX: 0000000000000000 RSI: 000000000000000c RDI: 0000000000000005
RBP: 00007fd5c158eff1 R08: 0000000000000000 R09: 0000000000000000
R10: 00008400fffffffb R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffe3285dabf R14: 00007fd5bfeaa300 R15: 0000000000022000
NMI backtrace for cpu 0
CPU: 0 PID: 18075 Comm: syz-executor.0 Not tainted 5.16.0-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:106
nmi_cpu_backtrace.cold+0x47/0x144 lib/nmi_backtrace.c:111
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: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:3878 [inline]
rcu_sched_clock_irq.cold+0x5c/0x759 kernel/rcu/tree.c:2597
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:1428
__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:check_kcov_mode+0x7/0x40 kernel/kcov.c:166
Code: 00 e9 59 fe ff ff 48 8b 7c 24 08 e8 43 3b 46 00 e9 61 fd ff ff cc cc cc cc cc cc cc cc cc cc cc cc cc cc 65 8b 05 a9 ac 8b 7e <89> c2 81 e2 00 01 00 00 a9 00 01 ff 00 74 10 31 c0 85 d2 74 15 8b
RSP: 0018:ffffc90003247250 EFLAGS: 00000246
RAX: 0000000080000001 RBX: ffff88814af72000 RCX: ffff88801a0d60c0
RDX: 0000000000000004 RSI: ffff88801a0d60c0 RDI: 0000000000000003
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: ffffffff8223dcf7 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: ffff88808a67ecdc R15: dffffc0000000000
write_comp_data kernel/kcov.c:221 [inline]
__sanitizer_cov_trace_const_cmp1+0x22/0x80 kernel/kcov.c:273
start_this_handle+0x327/0x1380 fs/jbd2/transaction.c:402
jbd2__journal_start+0x399/0x930 fs/jbd2/transaction.c:525
__ext4_journal_start_sb+0x227/0x4a0 fs/ext4/ext4_jbd2.c:105
__ext4_journal_start fs/ext4/ext4_jbd2.h:326 [inline]
ext4_dirty_inode+0x9d/0x110 fs/ext4/inode.c:5916
__mark_inode_dirty+0x45b/0xfe0 fs/fs-writeback.c:2399
mark_inode_dirty include/linux/fs.h:2451 [inline]
generic_write_end+0x31b/0x500 fs/buffer.c:2202
ext4_da_write_end+0x1c2/0x990 fs/ext4/inode.c:3059
generic_perform_write+0x2c6/0x510 mm/filemap.c:3765
ext4_buffered_write_iter+0x1ac/0x3b0 fs/ext4/file.c:269
ext4_file_write_iter+0x423/0x14e0 fs/ext4/file.c:681
call_write_iter include/linux/fs.h:2162 [inline]
do_iter_readv_writev+0x472/0x750 fs/read_write.c:725
do_iter_write+0x188/0x710 fs/read_write.c:851
vfs_iter_write+0x70/0xa0 fs/read_write.c:892
iter_file_splice_write+0x6fa/0xc10 fs/splice.c:689
do_splice_from fs/splice.c:767 [inline]
direct_splice_actor+0x110/0x180 fs/splice.c:936
splice_direct_to_actor+0x34b/0x8c0 fs/splice.c:891
do_splice_direct+0x1b3/0x280 fs/splice.c:979
do_sendfile+0xaf2/0x1250 fs/read_write.c:1245
__do_sys_sendfile64 fs/read_write.c:1310 [inline]
__se_sys_sendfile64 fs/read_write.c:1296 [inline]
__x64_sys_sendfile64+0x1cc/0x210 fs/read_write.c:1296
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: 0033:0x7f01053f4e99
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:00007f0103d6a168 EFLAGS: 00000246 ORIG_RAX: 0000000000000028
RAX: ffffffffffffffda RBX: 00007f0105507f60 RCX: 00007f01053f4e99
RDX: 0000000000000000 RSI: 000000000000000c RDI: 0000000000000005
RBP: 00007f010544eff1 R08: 0000000000000000 R09: 0000000000000000
R10: 00008400fffffffb R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffe2db6710f R14: 00007f0103d6a300 R15: 0000000000022000
sched: RT throttling activated
----------------
Code disassembly (best guess):
0: 08 0f or %cl,(%rdi)
2: b6 04 mov $0x4,%dh
4: 02 48 89 add -0x77(%rax),%cl
7: fa cli
8: 83 e2 07 and $0x7,%edx
b: 38 d0 cmp %dl,%al
d: 7f 04 jg 0x13
f: 84 c0 test %al,%al
11: 75 48 jne 0x5b
13: 80 7d 00 00 cmpb $0x0,0x0(%rbp)
17: 74 39 je 0x52
19: 48 bb 00 00 00 00 00 movabs $0xdffffc0000000000,%rbx
20: fc ff df
23: 48 89 e8 mov %rbp,%rax
26: 48 83 c0 01 add $0x1,%rax
* 2a: 48 89 c2 mov %rax,%rdx <-- trapping instruction
2d: 48 89 c1 mov %rax,%rcx
30: 48 c1 ea 03 shr $0x3,%rdx
34: 83 e1 07 and $0x7,%ecx
37: 0f b6 14 1a movzbl (%rdx,%rbx,1),%edx
3b: 38 ca cmp %cl,%dl
3d: 7f 04 jg 0x43
3f: 84 .byte 0x84