INFO: task syz-executor.3:3179 blocked for more than 140 seconds. Not tainted 4.19.196-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.3 D29520 3179 8161 0x00000004 Call Trace: context_switch kernel/sched/core.c:2828 [inline] __schedule+0x887/0x2040 kernel/sched/core.c:3517 schedule+0x8d/0x1b0 kernel/sched/core.c:3561 request_wait_answer+0x3dc/0x750 fs/fuse/dev.c:485 __fuse_request_send+0x123/0x1c0 fs/fuse/dev.c:505 fuse_simple_request+0x2e6/0x820 fs/fuse/dev.c:576 fuse_listxattr+0x234/0x4e0 fs/fuse/xattr.c:139 vfs_listxattr+0x105/0x190 fs/xattr.c:392 listxattr+0xd3/0x140 fs/xattr.c:687 path_listxattr+0xae/0x140 fs/xattr.c:711 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x4665d9 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:00007f7816412188 EFLAGS: 00000246 ORIG_RAX: 00000000000000c3 RAX: ffffffffffffffda RBX: 000000000056bf80 RCX: 00000000004665d9 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00000000200000c0 RBP: 00000000004bfcb9 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf80 R13: 00007ffd9c071c6f R14: 00007f7816412300 R15: 0000000000022000 Showing all locks held in the system: 1 lock held by khungtaskd/1569: #0: 00000000ce42749c (rcu_read_lock){....}, at: debug_show_all_locks+0x53/0x265 kernel/locking/lockdep.c:4441 1 lock held by in:imklog/7831: #0: 0000000024510623 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0x26f/0x310 fs/file.c:767 2 locks held by agetty/8050: #0: 00000000e614f26e (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:272 #1: 00000000bcff79ad (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x217/0x1950 drivers/tty/n_tty.c:2154 1 lock held by syz-fuzzer/8130: 2 locks held by kworker/u4:8/10647: 2 locks held by syz-executor.1/12322: 1 lock held by syz-executor.2/12326: 2 locks held by syz-executor.4/12330: ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 1569 Comm: khungtaskd Not tainted 4.19.196-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/0x2ef lib/dump_stack.c:118 nmi_cpu_backtrace.cold+0x63/0xa2 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x1a6/0x1f0 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:203 [inline] watchdog+0x991/0xe60 kernel/hung_task.c:287 kthread+0x33f/0x460 kernel/kthread.c:259 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 12326 Comm: syz-executor.2 Not tainted 4.19.196-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:cpu_clock_event_update kernel/events/core.c:9340 [inline] RIP: 0010:cpu_clock_event_read+0x34/0x50 kernel/events/core.c:9371 Code: 65 8b 3d 3f bd 8a 7e e8 fa 2b cc ff 48 8d bb d8 01 00 00 be 08 00 00 00 48 89 c5 e8 06 72 21 00 48 89 e8 48 87 83 d8 01 00 00 <48> 29 c5 48 01 ab b0 00 00 00 5b 5d c3 66 66 2e 0f 1f 84 00 00 00 RSP: 0018:ffff8880ba007b68 EFLAGS: 00000046 RAX: 000000b00d30782c RBX: ffff8880b29fa000 RCX: ffffffff8176c40a RDX: ffffed101653f43c RSI: 0000000000000008 RDI: ffff8880b29fa1d8 RBP: 000000b00d309d45 R08: 0000000000000001 R09: ffffed101653f43b R10: ffff8880b29fa1df R11: ffffffff8c66201b R12: ffff8880b29fa158 R13: ffffffff89fe8200 R14: ffff8880b29fa000 R15: dffffc0000000000 FS: 00007f3435688700(0000) GS:ffff8880ba000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fc45017dfd3 CR3: 00000000ab173000 CR4: 00000000001426f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: perf_swevent_hrtimer+0x128/0x3e0 kernel/events/core.c:9254 __run_hrtimer kernel/time/hrtimer.c:1419 [inline] __hrtimer_run_queues+0x3f6/0xe60 kernel/time/hrtimer.c:1481 hrtimer_interrupt+0x326/0x9e0 kernel/time/hrtimer.c:1539 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1071 [inline] smp_apic_timer_interrupt+0x10c/0x550 arch/x86/kernel/apic/apic.c:1096 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:894 RIP: 0010:preempt_count arch/x86/include/asm/preempt.h:23 [inline] RIP: 0010:check_kcov_mode kernel/kcov.c:67 [inline] RIP: 0010:write_comp_data+0xf/0x70 kernel/kcov.c:122 Code: 8b 11 48 83 c2 01 48 39 d0 76 07 48 89 34 d1 48 89 11 c3 0f 1f 84 00 00 00 00 00 49 89 f1 49 89 fa 65 48 8b 34 25 80 df 01 00 <65> 8b 05 6a 5f 9f 7e a9 00 01 1f 00 75 4f 8b 86 60 13 00 00 83 f8 RSP: 0018:ffff888035c2f780 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 RAX: 0000000000000007 RBX: ffffffff89417ca1 RCX: ffffffff87ef3f40 RDX: 0000000000000074 RSI: ffff88804b980580 RDI: 0000000000000001 RBP: ffff888035c2f8a0 R08: 0000000000000010 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000000 R12: dffffc0000000000 R13: ffffffff89417ca0 R14: 1ffff11006b85ef4 R15: 0000000000000074 format_decode+0x180/0xad0 lib/vsprintf.c:2028 vsnprintf+0x155/0x14f0 lib/vsprintf.c:2245 seq_vprintf fs/seq_file.c:391 [inline] seq_printf+0x195/0x240 fs/seq_file.c:406 print_binder_node_nilocked+0x5b1/0x7f0 drivers/android/binder.c:5221 print_binder_proc+0x4dc/0xec0 drivers/android/binder.c:5283 binder_transactions_show+0x51/0x90 drivers/android/binder.c:5538 seq_read+0x4be/0x1160 fs/seq_file.c:229 full_proxy_read+0x118/0x170 fs/debugfs/file.c:195 do_loop_readv_writev fs/read_write.c:701 [inline] do_loop_readv_writev fs/read_write.c:688 [inline] do_iter_read+0x471/0x630 fs/read_write.c:925 vfs_readv+0xe5/0x150 fs/read_write.c:987 do_preadv fs/read_write.c:1071 [inline] __do_sys_preadv fs/read_write.c:1121 [inline] __se_sys_preadv fs/read_write.c:1116 [inline] __x64_sys_preadv+0x22b/0x310 fs/read_write.c:1116 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x4665d9 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:00007f3435688188 EFLAGS: 00000246 ORIG_RAX: 0000000000000127 RAX: ffffffffffffffda RBX: 000000000056bf80 RCX: 00000000004665d9 RDX: 0000000000000218 RSI: 00000000200017c0 RDI: 0000000000000006 RBP: 00000000004bfcb9 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf80 R13: 00007fff07b8b37f R14: 00007f3435688300 R15: 0000000000022000