INFO: task syz-executor381:8102 blocked for more than 140 seconds. Not tainted 4.19.211-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor381 D27368 8102 8100 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 fuse_wait_on_page_writeback fs/fuse/file.c:383 [inline] fuse_wait_on_page_writeback.isra.0+0x11b/0x170 fs/fuse/file.c:379 fuse_launder_page fs/fuse/file.c:2033 [inline] fuse_launder_page+0xb6/0xe0 fs/fuse/file.c:2026 do_launder_page mm/truncate.c:655 [inline] invalidate_inode_pages2_range+0x795/0x1110 mm/truncate.c:725 fuse_finish_open+0x2e2/0x590 fs/fuse/file.c:182 fuse_open_common+0x254/0x2c0 fs/fuse/file.c:222 do_dentry_open+0x4aa/0x1160 fs/open.c:796 do_last fs/namei.c:3421 [inline] path_openat+0x793/0x2df0 fs/namei.c:3537 do_filp_open+0x18c/0x3f0 fs/namei.c:3567 do_sys_open+0x3b3/0x520 fs/open.c:1085 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7ff5bd80a4c9 Code: Bad RIP value. RSP: 002b:00007ff5bd7bb2f8 EFLAGS: 00000246 ORIG_RAX: 0000000000000055 RAX: ffffffffffffffda RBX: 00007ff5bd89b4c0 RCX: 00007ff5bd80a4c9 RDX: 00007ff5bd80a4c9 RSI: 0000000000000000 RDI: 00000000200001c0 RBP: 00007ff5bd868164 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0030656c69662f2e R13: 00007ff5bd864158 R14: 00007ff5bd866160 R15: 00007ff5bd89b4c8 Showing all locks held in the system: 1 lock held by khungtaskd/1570: #0: 0000000057f007c1 (rcu_read_lock){....}, at: debug_show_all_locks+0x53/0x265 kernel/locking/lockdep.c:4441 1 lock held by in:imklog/7799: #0: 0000000081900d84 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0x26f/0x310 fs/file.c:767 2 locks held by syz-executor381/8102: #0: 00000000a3be50de (sb_writers#11){.+.+}, at: sb_start_write include/linux/fs.h:1579 [inline] #0: 00000000a3be50de (sb_writers#11){.+.+}, at: mnt_want_write+0x3a/0xb0 fs/namespace.c:360 #1: 0000000030bf5b70 (&sb->s_type->i_mutex_key#17){+.+.}, at: inode_lock include/linux/fs.h:748 [inline] #1: 0000000030bf5b70 (&sb->s_type->i_mutex_key#17){+.+.}, at: fuse_open_common+0x1bc/0x2c0 fs/fuse/file.c:215 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 1570 Comm: khungtaskd Not tainted 4.19.211-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: 4693 Comm: systemd-journal Not tainted 4.19.211-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:do_filp_open+0x0/0x3f0 fs/namei.c:3561 Code: 86 75 f1 ff e9 7c ff ff ff e8 0c 76 f1 ff eb ca e8 05 76 f1 ff eb a4 48 89 df e8 fb 75 f1 ff e9 3d ff ff ff 66 0f 1f 44 00 00 <41> 57 41 56 49 be 00 00 00 00 00 fc ff df 41 55 49 89 d5 41 54 41 RSP: 0018:ffff8880a0e7fe50 EFLAGS: 00000293 RAX: ffff8880a0e725c0 RBX: 0000000000000000 RCX: ffffffff81a205d2 RDX: ffff8880a0e7fe90 RSI: ffff888096780340 RDI: 00000000ffffff9c RBP: 0000000000000015 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000005 R11: 0000000000000000 R12: ffff888096780340 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000040 FS: 00007f19992ca8c0(0000) GS:ffff8880ba000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f199669c018 CR3: 00000000a0db2000 CR4: 00000000003406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: do_sys_open+0x3b3/0x520 fs/open.c:1085 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7f1998859840 Code: 73 01 c3 48 8b 0d 68 77 20 00 f7 d8 64 89 01 48 83 c8 ff c3 66 0f 1f 44 00 00 83 3d 89 bb 20 00 00 75 10 b8 02 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 31 c3 48 83 ec 08 e8 1e f6 ff ff 48 89 04 24 RSP: 002b:00007fff5d4f1448 EFLAGS: 00000246 ORIG_RAX: 0000000000000002 RAX: ffffffffffffffda RBX: 00007fff5d4f1750 RCX: 00007f1998859840 RDX: 00000000000001a0 RSI: 0000000000080042 RDI: 000055c5fb438790 RBP: 000000000000000d R08: 00007f1998843bb8 R09: 00000000ffffffff R10: 0000000000000030 R11: 0000000000000246 R12: 00000000ffffffff R13: 000055c5fb434040 R14: 00007fff5d4f1710 R15: 000055c5fb441680 ---------------- Code disassembly (best guess), 4 bytes skipped: 0: e9 7c ff ff ff jmpq 0xffffff81 5: e8 0c 76 f1 ff callq 0xfff17616 a: eb ca jmp 0xffffffd6 c: e8 05 76 f1 ff callq 0xfff17616 11: eb a4 jmp 0xffffffb7 13: 48 89 df mov %rbx,%rdi 16: e8 fb 75 f1 ff callq 0xfff17616 1b: e9 3d ff ff ff jmpq 0xffffff5d 20: 66 0f 1f 44 00 00 nopw 0x0(%rax,%rax,1) * 26: 41 57 push %r15 <-- trapping instruction 28: 41 56 push %r14 2a: 49 be 00 00 00 00 00 movabs $0xdffffc0000000000,%r14 31: fc ff df 34: 41 55 push %r13 36: 49 89 d5 mov %rdx,%r13 39: 41 54 push %r12 3b: 41 rex.B