rcu: INFO: rcu_preempt self-detected stall on CPU rcu: 1-....: (10499 ticks this GP) idle=82a/1/0x4000000000000004 softirq=255854/255854 fqs=5232 rcu: (t=10501 jiffies g=474621 q=1318) NMI backtrace for cpu 1 CPU: 1 PID: 14363 Comm: syz-executor.4 Not tainted 4.19.140-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1fc/0x2fe lib/dump_stack.c:118 nmi_cpu_backtrace.cold+0x63/0xa2 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x1a6/0x1eb lib/nmi_backtrace.c:62 trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline] rcu_dump_cpu_stacks+0x15f/0x19c kernel/rcu/tree.c:1340 print_cpu_stall kernel/rcu/tree.c:1478 [inline] check_cpu_stall kernel/rcu/tree.c:1550 [inline] __rcu_pending kernel/rcu/tree.c:3293 [inline] rcu_pending kernel/rcu/tree.c:3336 [inline] rcu_check_callbacks.cold+0x62d/0xe19 kernel/rcu/tree.c:2682 update_process_times+0x2a/0xb0 kernel/time/timer.c:1650 tick_sched_handle+0x9b/0x180 kernel/time/tick-sched.c:168 tick_sched_timer+0xfc/0x290 kernel/time/tick-sched.c:1278 __run_hrtimer kernel/time/hrtimer.c:1401 [inline] __hrtimer_run_queues+0x3f6/0xe60 kernel/time/hrtimer.c:1463 hrtimer_interrupt+0x32a/0x930 kernel/time/hrtimer.c:1521 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1067 [inline] smp_apic_timer_interrupt+0x10c/0x550 arch/x86/kernel/apic/apic.c:1092 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:894 RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:789 [inline] RIP: 0010:lock_release+0x429/0x8b0 kernel/locking/lockdep.c:3929 Code: 84 08 00 00 00 00 00 00 48 c1 e8 03 80 3c 10 00 0f 85 95 03 00 00 48 83 3d cb ce 80 07 00 0f 84 cc 01 00 00 48 8b 3c 24 57 9d <0f> 1f 44 00 00 48 b8 00 00 00 00 00 fc ff df 49 c7 04 04 00 00 00 RSP: 0018:ffff8880ae707aa0 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13 RAX: 1ffffffff11a4b69 RBX: ffff888017e82080 RCX: 1ffff11002fd053f RDX: dffffc0000000000 RSI: 0000000000000007 RDI: 0000000000000286 RBP: 0000000000000006 R08: 0000000000000000 R09: 0000000000000006 R10: 0000000000000000 R11: 0000000000000000 R12: 1ffff11015ce0f57 R13: c8adfa32feacfe97 R14: ffff888017e82080 R15: 0000000000000007 write_seqcount_end include/linux/seqlock.h:387 [inline] qdisc_run_end include/net/sch_generic.h:145 [inline] __dev_xmit_skb net/core/dev.c:3501 [inline] __dev_queue_xmit+0x152d/0x2e00 net/core/dev.c:3807 mrp_queue_xmit net/802/mrp.c:354 [inline] mrp_join_timer+0x8a/0xc0 net/802/mrp.c:598 call_timer_fn+0x177/0x700 kernel/time/timer.c:1338 expire_timers+0x243/0x4e0 kernel/time/timer.c:1375 __run_timers kernel/time/timer.c:1703 [inline] run_timer_softirq+0x21c/0x670 kernel/time/timer.c:1716 __do_softirq+0x26c/0x9a0 kernel/softirq.c:292 invoke_softirq kernel/softirq.c:372 [inline] irq_exit+0x215/0x260 kernel/softirq.c:412 exiting_irq arch/x86/include/asm/apic.h:544 [inline] smp_apic_timer_interrupt+0x136/0x550 arch/x86/kernel/apic/apic.c:1094 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:894 RIP: 0010:write_comp_data+0x23/0x70 kernel/kcov.c:122 Code: 1f 84 00 00 00 00 00 49 89 f1 49 89 fa 65 48 8b 34 25 40 ee 01 00 65 8b 05 5a 3d 98 7e a9 00 01 1f 00 75 4f 8b 86 d8 12 00 00 <83> f8 03 75 44 48 8b 86 e0 12 00 00 8b b6 dc 12 00 00 48 8b 38 48 RSP: 0018:ffff888013206fb0 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 RAX: 0000000000000002 RBX: ffff888013207200 RCX: ffffffff81e53be9 RDX: 0000000000000000 RSI: ffff888017e82080 RDI: 0000000000000005 RBP: 0000000000000000 R08: ffff888013207110 R09: 0000000000000000 R10: 0000000000000005 R11: 0000000000000000 R12: ffff888013207200 R13: ffff8880132071a0 R14: 0000000000000002 R15: ffff888013207208 ext4_get_branch+0x179/0x5a0 fs/ext4/indirect.c:156 ext4_ind_map_blocks+0x5db/0x2430 fs/ext4/indirect.c:539 ext4_map_blocks+0x3a6/0x1a50 fs/ext4/inode.c:575 _ext4_get_block+0x208/0x530 fs/ext4/inode.c:802 ext4_get_block_trans+0x165/0x290 fs/ext4/inode.c:863 ext4_dio_get_block+0x73/0xc0 fs/ext4/inode.c:880 get_more_blocks fs/direct-io.c:717 [inline] do_direct_IO fs/direct-io.c:1002 [inline] do_blockdev_direct_IO fs/direct-io.c:1332 [inline] __blockdev_direct_IO+0x4244/0xeee6 fs/direct-io.c:1418 ext4_direct_IO_write fs/ext4/inode.c:3769 [inline] ext4_direct_IO+0xae4/0x1c50 fs/ext4/inode.c:3907 generic_file_direct_write+0x208/0x4a0 mm/filemap.c:3065 __generic_file_write_iter+0x2d0/0x610 mm/filemap.c:3244 ext4_file_write_iter+0x2fe/0xf20 fs/ext4/file.c:272 call_write_iter include/linux/fs.h:1821 [inline] do_iter_readv_writev+0x668/0x790 fs/read_write.c:681 do_iter_write+0x182/0x5d0 fs/read_write.c:960 vfs_writev+0x153/0x2e0 fs/read_write.c:1005 do_pwritev fs/read_write.c:1094 [inline] __do_sys_pwritev fs/read_write.c:1141 [inline] __se_sys_pwritev fs/read_write.c:1136 [inline] __x64_sys_pwritev+0x22b/0x310 fs/read_write.c:1136 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45d4d9 Code: 5d b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 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 0f 83 2b b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f188814bc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000128 RAX: ffffffffffffffda RBX: 0000000000025dc0 RCX: 000000000045d4d9 RDX: 0000000000000004 RSI: 00000000200004c0 RDI: 0000000000000005 RBP: 000000000118cf90 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000402400 R11: 0000000000000246 R12: 000000000118cf4c R13: 00007ffc2e95df0f R14: 00007f188814c9c0 R15: 000000000118cf4c