INFO: task syz-executor.0:10043 blocked for more than 143 seconds. Not tainted 5.11.0-rc3-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.0 state:D stack:25904 pid:10043 ppid: 8467 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:4313 [inline] __schedule+0xa4d/0xf80 kernel/sched/core.c:5064 schedule+0x14b/0x200 kernel/sched/core.c:5143 rwsem_down_write_slowpath+0xe52/0x1590 kernel/locking/rwsem.c:1106 __down_write_common kernel/locking/rwsem.c:1261 [inline] __down_write kernel/locking/rwsem.c:1270 [inline] down_write_nested+0x16c/0x180 kernel/locking/rwsem.c:1517 inode_lock_nested include/linux/fs.h:808 [inline] filename_create+0x19f/0x700 fs/namei.c:3469 user_path_create fs/namei.c:3527 [inline] do_mkdirat+0xaf/0x390 fs/namei.c:3667 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45d637 RSP: 002b:00007f24239c0a78 EFLAGS: 00000246 ORIG_RAX: 0000000000000053 RAX: ffffffffffffffda RBX: 00007f24239c0b10 RCX: 000000000045d637 RDX: 0000000000000000 RSI: 00000000000001ff RDI: 0000000020002180 RBP: 00007f24239c0ad0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000020002180 R14: 0000000000000000 R15: 0000000000000000 INFO: task syz-executor.0:10055 blocked for more than 143 seconds. Not tainted 5.11.0-rc3-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.0 state:D stack:25680 pid:10055 ppid: 8467 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:4313 [inline] __schedule+0xa4d/0xf80 kernel/sched/core.c:5064 schedule+0x14b/0x200 kernel/sched/core.c:5143 rwsem_down_write_slowpath+0xe52/0x1590 kernel/locking/rwsem.c:1106 __down_write_common kernel/locking/rwsem.c:1261 [inline] __down_write kernel/locking/rwsem.c:1270 [inline] down_write+0x160/0x170 kernel/locking/rwsem.c:1407 inode_lock include/linux/fs.h:773 [inline] lock_mount+0x6a/0x2f0 fs/namespace.c:2195 do_new_mount_fc fs/namespace.c:2821 [inline] do_new_mount fs/namespace.c:2880 [inline] path_mount+0x22dc/0x2c50 fs/namespace.c:3208 do_mount fs/namespace.c:3221 [inline] __do_sys_mount fs/namespace.c:3429 [inline] __se_sys_mount+0x2f9/0x3b0 fs/namespace.c:3406 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45e219 RSP: 002b:00007f242397ec68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 000000000045e219 RDX: 0000000020002000 RSI: 00000000200042c0 RDI: 0000000000000000 RBP: 000000000119c120 R08: 0000000020002100 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000119c0dc R13: 00007ffca692eb9f R14: 00007f242397f9c0 R15: 000000000119c0dc Showing all locks held in the system: 1 lock held by khungtaskd/1641: #0: ffffffff8c311580 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x0/0x30 arch/x86/pci/mmconfig_64.c:151 1 lock held by in:imklog/8145: #0: ffff88801ba01270 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x24e/0x2f0 fs/file.c:947 2 locks held by syz-executor.0/10043: #0: ffff888012ebc460 (sb_writers#14){.+.+}-{0:0}, at: mnt_want_write+0x3b/0x80 fs/namespace.c:354 #1: ffff888073418150 (&type->i_mutex_dir_key#8/1){+.+.}-{3:3}, at: inode_lock_nested include/linux/fs.h:808 [inline] #1: ffff888073418150 (&type->i_mutex_dir_key#8/1){+.+.}-{3:3}, at: filename_create+0x19f/0x700 fs/namei.c:3469 2 locks held by syz-executor.0/10045: 1 lock held by syz-executor.0/10055: #0: ffff888073418150 (&type->i_mutex_dir_key#9){++++}-{3:3}, at: inode_lock include/linux/fs.h:773 [inline] #0: ffff888073418150 (&type->i_mutex_dir_key#9){++++}-{3:3}, at: lock_mount+0x6a/0x2f0 fs/namespace.c:2195 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 1641 Comm: khungtaskd Not tainted 5.11.0-rc3-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:79 [inline] dump_stack+0x183/0x22e lib/dump_stack.c:120 nmi_cpu_backtrace+0x16c/0x190 lib/nmi_backtrace.c:105 nmi_trigger_cpumask_backtrace+0x191/0x2f0 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:209 [inline] watchdog+0xce9/0xd30 kernel/hung_task.c:294 kthread+0x39a/0x3c0 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 7 Comm: kworker/0:1 Not tainted 5.11.0-rc3-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: events_power_efficient fb_flashcursor RIP: 0010:slow_down_io arch/x86/include/asm/paravirt.h:42 [inline] RIP: 0010:inb_p arch/x86/include/asm/io.h:334 [inline] RIP: 0010:vga_io_r include/video/vga.h:204 [inline] RIP: 0010:vga_io_rgfx include/video/vga.h:389 [inline] RIP: 0010:setmode drivers/video/fbdev/vga16fb.c:124 [inline] RIP: 0010:vga_imageblit_expand drivers/video/fbdev/vga16fb.c:1171 [inline] RIP: 0010:vga16fb_imageblit+0xbf7/0x1cb0 drivers/video/fbdev/vga16fb.c:1260 Code: 48 c7 c3 f0 27 18 8c 48 c1 eb 03 42 80 3c 2b 00 74 0c 48 c7 c7 f0 27 18 8c e8 85 2a 98 fd ff 15 ef 75 ed 07 ba cf 03 00 00 ec <42> 80 3c 2b 00 74 0c 48 c7 c7 f0 27 18 8c e8 66 2a 98 fd ff 15 d0 RSP: 0018:ffffc90000cc78c8 EFLAGS: 00000246 RAX: 1ffff110285da1ff RBX: 1ffffffff18304fe RCX: 1ffff1102873b040 RDX: 00000000000003cf RSI: 0000000000000001 RDI: 0000000000000000 RBP: 0000000000000007 R08: ffffffff842aaf40 R09: ffffed10285da1cc R10: ffffed10285da1cc R11: 0000000000000000 R12: ffff8880180d1670 R13: dffffc0000000000 R14: ffff8880000a0f11 R15: 0000000000000f00 FS: 0000000000000000(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fa011a2d000 CR3: 000000002f2ca000 CR4: 00000000001506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: soft_cursor+0xace/0xd20 drivers/video/fbdev/core/softcursor.c:74 bit_cursor+0x17f3/0x23a0 drivers/video/fbdev/core/bitblit.c:377 fb_flashcursor+0x316/0x430 drivers/video/fbdev/core/fbcon.c:395 process_one_work+0x833/0x10c0 kernel/workqueue.c:2275 worker_thread+0xaa4/0x1460 kernel/workqueue.c:2421 kthread+0x39a/0x3c0 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296