INFO: task syz-executor311:8120 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-executor311 D26816 8120 8118 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: 0033:0x7f400b986149 Code: Bad RIP value. RSP: 002b:00007f400b92f2f8 EFLAGS: 00000246 ORIG_RAX: 0000000000000055 RAX: ffffffffffffffda RBX: 00007f400ba0f4a0 RCX: 00007f400b986149 RDX: 00007f400b986149 RSI: 0000000000000000 RDI: 00000000200001c0 RBP: 00007f400b9dc37c R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0030656c69662f2e R13: 00007f400b9d8370 R14: 00007f400b9da378 R15: 00007f400ba0f4a8 Showing all locks held in the system: 1 lock held by khungtaskd/1572: #0: 000000007128f21f (rcu_read_lock){....}, at: debug_show_all_locks+0x53/0x265 kernel/locking/lockdep.c:4441 1 lock held by in:imklog/7783: 2 locks held by syz-executor311/8120: #0: 00000000f3f46f1a (sb_writers#12){.+.+}, at: sb_start_write include/linux/fs.h:1579 [inline] #0: 00000000f3f46f1a (sb_writers#12){.+.+}, at: mnt_want_write+0x3a/0xb0 fs/namespace.c:360 #1: 00000000fc050e6c (&sb->s_type->i_mutex_key#17){+.+.}, at: inode_lock include/linux/fs.h:748 [inline] #1: 00000000fc050e6c (&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: 1572 Comm: khungtaskd Not tainted 4.19.211-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 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: 4695 Comm: systemd-journal Not tainted 4.19.211-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 RIP: 0010:append_char kernel/printk/printk.c:703 [inline] RIP: 0010:msg_print_ext_body+0x76/0x450 kernel/printk/printk.c:732 Code: ed eb 76 e8 ac 23 15 00 44 89 e6 bf 5c 00 00 00 e8 cf 24 15 00 41 80 fc 5c 0f 84 ab 00 00 00 e8 90 23 15 00 48 39 1c 24 76 36 85 23 15 00 48 8d 53 01 48 89 d8 48 b9 00 00 00 00 00 fc ff df RSP: 0018:ffff8880a0907b50 EFLAGS: 00000016 RAX: ffff8880a08fe640 RBX: ffff8880a0b707fb RCX: ffffffff814d61d1 RDX: 0000000000000000 RSI: ffffffff814d61e0 RDI: 0000000000000001 RBP: 0000000000000000 R08: ffffffff8d224f94 R09: 000000000000005c R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000053 R13: 0000000000000021 R14: ffffffff8d224f94 R15: 0000000000000033 FS: 00007f5cbdefe8c0(0000) GS:ffff8880ba000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f5cbb2ce008 CR3: 00000000a0f47000 CR4: 00000000003406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: devkmsg_read+0x540/0xae0 kernel/printk/printk.c:881 __vfs_read+0xf7/0x750 fs/read_write.c:416 vfs_read+0x194/0x3c0 fs/read_write.c:452 ksys_read+0x12b/0x2a0 fs/read_write.c:579 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7f5cbd48d210 Code: 73 01 c3 48 8b 0d 98 7d 20 00 f7 d8 64 89 01 48 83 c8 ff c3 66 0f 1f 44 00 00 83 3d b9 c1 20 00 00 75 10 b8 00 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 31 c3 48 83 ec 08 e8 4e fc ff ff 48 89 04 24 RSP: 002b:00007ffe93d96a28 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 RAX: ffffffffffffffda RBX: 00007ffe93d994a0 RCX: 00007f5cbd48d210 RDX: 0000000000002000 RSI: 00007ffe93d972a0 RDI: 0000000000000009 RBP: 0000000000000000 R08: 0000000000000008 R09: 000000a4f2b24eaf R10: 0012eb9fb2c5afc0 R11: 0000000000000246 R12: 00007ffe93d972a0 R13: 00007ffe93d993f8 R14: 000055c2e7cb6958 R15: 0005ecb443d647b2