INFO: task syz-executor.1:16784 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-executor.1 D26136 16784 8710 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 io_schedule+0xb5/0x120 kernel/sched/core.c:5181 bit_wait_io+0x12/0x90 kernel/sched/wait_bit.c:207 __wait_on_bit_lock+0xb5/0x170 kernel/sched/wait_bit.c:89 out_of_line_wait_on_bit_lock+0xd2/0x100 kernel/sched/wait_bit.c:116 wait_on_bit_lock_io include/linux/wait_bit.h:208 [inline] __lock_buffer+0x52/0x60 fs/buffer.c:65 lock_buffer include/linux/buffer_head.h:374 [inline] __sync_dirty_buffer+0x2a6/0x320 fs/buffer.c:3178 __ext4_handle_dirty_metadata+0x234/0x590 fs/ext4/ext4_jbd2.c:300 ext4_convert_inline_data_nolock+0x5c9/0xd10 fs/ext4/inline.c:1246 ext4_convert_inline_data+0x347/0x3a0 fs/ext4/inline.c:2033 ext4_punch_hole+0x1e0/0x11f0 fs/ext4/inode.c:4305 ext4_fallocate+0x3f8/0x2150 fs/ext4/extents.c:4960 vfs_fallocate+0x487/0x9a0 fs/open.c:308 ksys_fallocate fs/open.c:331 [inline] __do_sys_fallocate fs/open.c:339 [inline] __se_sys_fallocate fs/open.c:337 [inline] __x64_sys_fallocate+0xcf/0x140 fs/open.c:337 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7f0e6afdc0f9 Code: Bad RIP value. RSP: 002b:00007f0e6954e168 EFLAGS: 00000246 ORIG_RAX: 000000000000011d RAX: ffffffffffffffda RBX: 00007f0e6b0fbf80 RCX: 00007f0e6afdc0f9 RDX: 0000000000000000 RSI: 0000000000000003 RDI: 0000000000000005 RBP: 00007f0e6b037ae9 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000ff8000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffea9657d3f R14: 00007f0e6954e300 R15: 0000000000022000 Showing all locks held in the system: 1 lock held by khungtaskd/1570: #0: 000000006ab7b76a (rcu_read_lock){....}, at: debug_show_all_locks+0x53/0x265 kernel/locking/lockdep.c:4441 2 locks held by systemd-udevd/4696: 1 lock held by in:imklog/7805: #0: 00000000e5489179 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0x26f/0x310 fs/file.c:767 2 locks held by agetty/7827: #0: 000000001b2c482d (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:272 #1: 000000009d2d4889 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x217/0x1950 drivers/tty/n_tty.c:2154 3 locks held by kworker/u4:6/8847: 3 locks held by kworker/0:7/19508: 3 locks held by kworker/u4:11/698: 3 locks held by syz-executor.1/16784: #0: 0000000038e099ec (sb_writers#3){.+.+}, at: file_start_write include/linux/fs.h:2779 [inline] #0: 0000000038e099ec (sb_writers#3){.+.+}, at: vfs_fallocate+0x7c0/0x9a0 fs/open.c:307 #1: 0000000062584452 (&ei->i_mmap_sem){++++}, at: ext4_punch_hole+0x1d8/0x11f0 fs/ext4/inode.c:4304 #2: 00000000a2b56bb7 (&ei->xattr_sem){++++}, at: ext4_write_lock_xattr fs/ext4/xattr.h:141 [inline] #2: 00000000a2b56bb7 (&ei->xattr_sem){++++}, at: ext4_convert_inline_data+0x20a/0x3a0 fs/ext4/inline.c:2031 1 lock held by syz-executor.3/23000: 1 lock held by syz-executor.2/22992: ============================================= 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 01/21/2023 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: 22975 Comm: syz-executor.3 Not tainted 4.19.211-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/21/2023 RIP: 0033:0x7f8a59fd45c0 Code: 00 00 41 89 c5 e9 75 fe ff ff 43 89 2c 84 e9 a3 fe ff ff 0f 1f 80 00 00 00 00 49 39 d4 74 70 48 8d 72 10 4c 39 e6 75 05 eb 26 <48> 8b 3a 48 8b 0e 48 8d 42 08 48 39 cf 74 0e 48 89 4a 08 48 8d 4a RSP: 002b:00007fffa2c8ccb0 EFLAGS: 00000206 RAX: 00007f8a5939b990 RBX: 00007f8a5939b008 RCX: ffffffff83772075 RDX: 00007f8a5939b988 RSI: 00007f8a594d0db0 RDI: ffffffff83772075 RBP: 000000000003ffff R08: 00007f8a5939b0d8 R09: 00000000ab06a973 R10: 0000000000000000 R11: 0000000000000000 R12: 00007f8a5959b000 R13: 00007f8a5959b000 R14: 00007f8a5a147288 R15: ffffffff8706c816 FS: 00005555555df400 GS: 0000000000000000