INFO: task syz-executor.4:8628 blocked for more than 143 seconds. Not tainted 5.4.0-rc8-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.4 D27384 8628 7986 0x00004004 Call Trace: context_switch kernel/sched/core.c:3384 [inline] __schedule+0x7b7/0xc30 kernel/sched/core.c:4078 schedule+0x131/0x1e0 kernel/sched/core.c:4145 io_schedule+0x8b/0x100 kernel/sched/core.c:5789 wait_on_page_bit_common+0x918/0xc90 mm/filemap.c:1175 wait_on_page_bit+0x46/0x50 mm/filemap.c:1224 wait_on_page_writeback+0x13e/0x180 mm/page-writeback.c:2822 truncate_inode_pages_range+0x119b/0x16e0 mm/truncate.c:448 truncate_inode_pages mm/truncate.c:476 [inline] truncate_pagecache mm/truncate.c:817 [inline] truncate_setsize+0xd9/0x100 mm/truncate.c:842 fat_setattr+0x8d4/0xd60 fs/fat/file.c:547 notify_change+0xa27/0xe70 fs/attr.c:337 do_truncate+0x194/0x230 fs/open.c:64 handle_truncate fs/namei.c:2998 [inline] do_last fs/namei.c:3414 [inline] path_openat+0x2fe3/0x4420 fs/namei.c:3525 do_filp_open+0x192/0x3d0 fs/namei.c:3555 do_sys_open+0x29f/0x560 fs/open.c:1097 ksys_open include/linux/syscalls.h:1385 [inline] __do_sys_creat fs/open.c:1155 [inline] __se_sys_creat fs/open.c:1153 [inline] __x64_sys_creat+0x65/0x70 fs/open.c:1153 do_syscall_64+0xf7/0x1c0 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45a639 Code: Bad RIP value. RSP: 002b:00007fc177d21c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000055 RAX: ffffffffffffffda RBX: 0000000000000002 RCX: 000000000045a639 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000020000700 RBP: 000000000075bfc8 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007fc177d226d4 R13: 00000000004c0ee8 R14: 00000000004d3be0 R15: 00000000ffffffff INFO: task syz-executor.4:8647 blocked for more than 143 seconds. Not tainted 5.4.0-rc8-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.4 D26208 8647 7986 0x00004004 Call Trace: context_switch kernel/sched/core.c:3384 [inline] __schedule+0x7b7/0xc30 kernel/sched/core.c:4078 schedule+0x131/0x1e0 kernel/sched/core.c:4145 io_schedule+0x8b/0x100 kernel/sched/core.c:5789 wait_on_page_bit_common+0x918/0xc90 mm/filemap.c:1175 wait_on_page_bit+0x46/0x50 mm/filemap.c:1224 wait_on_page_writeback+0x13e/0x180 mm/page-writeback.c:2822 __filemap_fdatawait_range+0x1b5/0x3b0 mm/filemap.c:526 file_write_and_wait_range+0x141/0x1a0 mm/filemap.c:786 __generic_file_fsync+0x76/0x1a0 fs/libfs.c:1000 fat_file_fsync+0x7c/0x190 fs/fat/file.c:199 vfs_fsync_range+0xfd/0x1a0 fs/sync.c:197 generic_write_sync include/linux/fs.h:2853 [inline] generic_file_write_iter+0x575/0x630 mm/filemap.c:3470 do_iter_readv_writev+0x651/0x8e0 include/linux/fs.h:1889 do_iter_write+0x180/0x590 fs/read_write.c:970 vfs_iter_write+0x7c/0xa0 fs/read_write.c:983 iter_file_splice_write+0x6d8/0xe20 fs/splice.c:746 do_splice_from fs/splice.c:848 [inline] direct_splice_actor+0xf7/0x130 fs/splice.c:1020 splice_direct_to_actor+0x463/0xac0 fs/splice.c:975 do_splice_direct+0x200/0x330 fs/splice.c:1063 do_sendfile+0x7e4/0xfd0 fs/read_write.c:1464 __do_sys_sendfile64 fs/read_write.c:1519 [inline] __se_sys_sendfile64 fs/read_write.c:1511 [inline] __x64_sys_sendfile64+0xfc/0x1b0 fs/read_write.c:1511 do_syscall_64+0xf7/0x1c0 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45a639 Code: Bad RIP value. RSP: 002b:00007fc177c9dc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000028 RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 000000000045a639 RDX: 0000000020000000 RSI: 0000000000000014 RDI: 0000000000000014 RBP: 000000000075c268 R08: 0000000000000000 R09: 0000000000000000 R10: 00008080fffffffe R11: 0000000000000246 R12: 00007fc177c9e6d4 R13: 00000000004c85aa R14: 00000000004dec38 R15: 00000000ffffffff Showing all locks held in the system: 1 lock held by khungtaskd/1072: #0: ffffffff888d3e40 (rcu_read_lock){....}, at: rcu_lock_acquire+0x4/0x30 include/linux/rcupdate.h:207 2 locks held by rsyslogd/7847: #0: ffff88809d6ce3a0 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0x243/0x2e0 fs/file.c:801 #1: ffff8880aeb34998 (&rq->lock){-.-.}, at: rq_lock kernel/sched/sched.h:1215 [inline] #1: ffff8880aeb34998 (&rq->lock){-.-.}, at: __schedule+0xda/0xc30 kernel/sched/core.c:4026 2 locks held by getty/7937: #0: ffff8880a2e0d090 (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:272 #1: ffffc90005f3f2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x221/0x1b00 drivers/tty/n_tty.c:2156 2 locks held by getty/7938: #0: ffff8880a49c7090 (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:272 #1: ffffc90005f352e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x221/0x1b00 drivers/tty/n_tty.c:2156 2 locks held by getty/7939: #0: ffff8880a979d090 (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:272 #1: ffffc90005f432e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x221/0x1b00 drivers/tty/n_tty.c:2156 2 locks held by getty/7940: #0: ffff8880a814d090 (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:272 #1: ffffc90005f392e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x221/0x1b00 drivers/tty/n_tty.c:2156 2 locks held by getty/7941: #0: ffff8880a3a33090 (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:272 #1: ffffc90005f292e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x221/0x1b00 drivers/tty/n_tty.c:2156 2 locks held by getty/7942: #0: ffff888096c50090 (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:272 #1: ffffc90005f1d2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x221/0x1b00 drivers/tty/n_tty.c:2156 2 locks held by getty/7943: #0: ffff88809aaa4090 (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:272 #1: ffffc90005f112e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x221/0x1b00 drivers/tty/n_tty.c:2156 3 locks held by syz-executor.4/8628: #0: ffff8880548e2428 (sb_writers#15){.+.+}, at: sb_start_write include/linux/fs.h:1650 [inline] #0: ffff8880548e2428 (sb_writers#15){.+.+}, at: mnt_want_write+0x4a/0xa0 fs/namespace.c:354 #1: ffff8880a2b37830 (&sb->s_type->i_mutex_key#21){++++}, at: inode_lock include/linux/fs.h:791 [inline] #1: ffff8880a2b37830 (&sb->s_type->i_mutex_key#21){++++}, at: do_truncate+0x186/0x230 fs/open.c:62 #2: ffff8880a2b376d0 (&ei->truncate_lock){+.+.}, at: fat_setattr+0x8b9/0xd60 fs/fat/file.c:546 1 lock held by syz-executor.4/8647: #0: ffff8880548e2428 (sb_writers#15){.+.+}, at: file_start_write include/linux/fs.h:2882 [inline] #0: ffff8880548e2428 (sb_writers#15){.+.+}, at: do_sendfile+0x7c2/0xfd0 fs/read_write.c:1463 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 1072 Comm: khungtaskd Not tainted 5.4.0-rc8-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+0x1fb/0x318 lib/dump_stack.c:118 nmi_cpu_backtrace+0xaf/0x1a0 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x174/0x290 lib/nmi_backtrace.c:62 arch_trigger_cpumask_backtrace+0x10/0x20 arch/x86/kernel/apic/hw_nmi.c:38 trigger_all_cpu_backtrace+0x17/0x20 include/linux/nmi.h:146 check_hung_uninterruptible_tasks kernel/hung_task.c:205 [inline] watchdog+0xbb9/0xbd0 kernel/hung_task.c:289 kthread+0x332/0x350 kernel/kthread.c:255 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 skipped: idling at native_safe_halt+0xe/0x10 arch/x86/include/asm/irqflags.h:60