INFO: task syz-executor104:7980 blocked for more than 140 seconds. Not tainted 4.14.301-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor104 D28048 7980 7978 0x00000004 Call Trace: context_switch kernel/sched/core.c:2811 [inline] __schedule+0x88b/0x1de0 kernel/sched/core.c:3387 schedule+0x8d/0x1b0 kernel/sched/core.c:3431 fuse_wait_on_page_writeback fs/fuse/file.c:385 [inline] fuse_wait_on_page_writeback.isra.0+0xdc/0x120 fs/fuse/file.c:381 fuse_launder_page fs/fuse/file.c:2042 [inline] fuse_launder_page+0xa2/0xd0 fs/fuse/file.c:2035 do_launder_page mm/truncate.c:609 [inline] invalidate_inode_pages2_range+0x547/0xc00 mm/truncate.c:685 fuse_finish_open+0x262/0x500 fs/fuse/file.c:181 fuse_open_common+0x234/0x290 fs/fuse/file.c:224 do_dentry_open+0x44b/0xec0 fs/open.c:777 vfs_open+0x105/0x220 fs/open.c:888 do_last fs/namei.c:3428 [inline] path_openat+0x628/0x2970 fs/namei.c:3571 do_filp_open+0x179/0x3c0 fs/namei.c:3605 do_sys_open+0x296/0x410 fs/open.c:1081 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x5e/0xd3 RIP: 0033:0x7fe46c4404c9 RSP: 002b:00007fe46c3f12f8 EFLAGS: 00000246 ORIG_RAX: 0000000000000055 RAX: ffffffffffffffda RBX: 00007fe46c4d14c0 RCX: 00007fe46c4404c9 RDX: 00007fe46c4404c9 RSI: 0000000000000000 RDI: 00000000200001c0 RBP: 00007fe46c49e164 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0030656c69662f2e R13: 00007fe46c49a158 R14: 00007fe46c49c160 R15: 00007fe46c4d14c8 Showing all locks held in the system: 1 lock held by khungtaskd/1533: #0: (tasklist_lock){.+.+}, at: [] debug_show_all_locks+0x7c/0x21a kernel/locking/lockdep.c:4548 1 lock held by in:imklog/7689: #0: (&f->f_pos_lock){+.+.}, at: [] __fdget_pos+0x1fb/0x2b0 fs/file.c:819 2 locks held by syz-executor104/7980: #0: (sb_writers#10){.+.+}, at: [] sb_start_write include/linux/fs.h:1551 [inline] #0: (sb_writers#10){.+.+}, at: [] mnt_want_write+0x3a/0xb0 fs/namespace.c:386 #1: (&sb->s_type->i_mutex_key#17){+.+.}, at: [] inode_lock include/linux/fs.h:719 [inline] #1: (&sb->s_type->i_mutex_key#17){+.+.}, at: [] fuse_open_common+0x1a4/0x290 fs/fuse/file.c:217 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 1533 Comm: khungtaskd Not tainted 4.14.301-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x1b2/0x281 lib/dump_stack.c:58 nmi_cpu_backtrace.cold+0x57/0x93 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x13a/0x180 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:140 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:195 [inline] watchdog+0x5b9/0xb40 kernel/hung_task.c:274 kthread+0x30d/0x420 kernel/kthread.c:232 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:406 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 4624 Comm: systemd-journal Not tainted 4.14.301-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 task: ffff8880a16da140 task.stack: ffff8880a16e0000 RIP: 0010:kernel_poison_pages+0x22/0x250 mm/page_poison.c:114 RSP: 0018:ffff8880a16e7a00 EFLAGS: 00000046 RAX: ffff8880a16da140 RBX: ffffea0002c48000 RCX: 0000000000000000 RDX: 0000000000000000 RSI: 0000000000000002 RDI: ffffea0002c48000 RBP: 0000000000000002 R08: 0000000000001000 R09: ffffed1016240000 R10: 0000000000000000 R11: ffff8880a16da140 R12: 0000000000000001 R13: dffffc0000000000 R14: ffff88813fffb6c0 R15: ffffea0002c48000 FS: 00007ff9952ee8c0(0000) GS:ffff8880ba500000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ff9926be000 CR3: 00000000a32bf000 CR4: 00000000003406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: post_alloc_hook mm/page_alloc.c:1775 [inline] prep_new_page mm/page_alloc.c:1784 [inline] get_page_from_freelist+0x16fd/0x25a0 mm/page_alloc.c:3176 __alloc_pages_nodemask+0x352/0x2900 mm/page_alloc.c:4219 __alloc_pages include/linux/gfp.h:484 [inline] __alloc_pages_node include/linux/gfp.h:497 [inline] kmem_getpages mm/slab.c:1419 [inline] cache_grow_begin+0x91/0x700 mm/slab.c:2676 cache_alloc_refill+0x273/0x350 mm/slab.c:3043 ____cache_alloc mm/slab.c:3125 [inline] __do_cache_alloc mm/slab.c:3347 [inline] slab_alloc mm/slab.c:3382 [inline] kmem_cache_alloc+0x333/0x3c0 mm/slab.c:3550 getname_flags+0xc8/0x550 fs/namei.c:138 getname fs/namei.c:209 [inline] user_path_create fs/namei.c:3734 [inline] SYSC_mkdirat fs/namei.c:3866 [inline] SyS_mkdirat+0x83/0x270 fs/namei.c:3858 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x5e/0xd3 RIP: 0033:0x7ff9945a9687 RSP: 002b:00007ffc1eaf2e08 EFLAGS: 00000293 ORIG_RAX: 0000000000000053 RAX: ffffffffffffffda RBX: 00007ffc1eaf5e70 RCX: 00007ff9945a9687 RDX: 0000000000000000 RSI: 00000000000001ed RDI: 00005645ac04e8a0 RBP: 00007ffc1eaf2e40 R08: 00005645abf313e5 R09: 0000000000000018 R10: 0000000000000069 R11: 0000000000000293 R12: 0000000000000000 R13: 0000000000000001 R14: 00005645ac04e8a0 R15: 00007ffc1eaf3480 Code: 05 b0 9e 8a 08 c3 0f 1f 00 41 57 41 56 41 55 41 54 41 89 d4 55 89 f5 53 48 89 fb 48 83 ec 08 e8 b5 b6 d6 ff 80 3d 8a 9e 8a 08 00 <0f> 84 c0 00 00 00 e8 a3 b6 d6 ff 45 85 e4 0f 84 c5 00 00 00 e8