INFO: task syz-executor:6810 blocked for more than 143 seconds. Not tainted 6.10.0-rc6-syzkaller-00061-ge9d22f7a6655 #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor state:D stack:20368 pid:6810 tgid:6810 ppid:1 flags:0x00004006 Call Trace: context_switch kernel/sched/core.c:5408 [inline] __schedule+0x17e8/0x4a20 kernel/sched/core.c:6745 __schedule_loop kernel/sched/core.c:6822 [inline] schedule+0x14b/0x320 kernel/sched/core.c:6837 io_schedule+0x8d/0x110 kernel/sched/core.c:9043 folio_wait_bit_common+0x882/0x12b0 mm/filemap.c:1307 folio_wait_writeback+0xe7/0x1e0 mm/page-writeback.c:3140 truncate_inode_pages_range+0xafd/0xfc0 mm/truncate.c:414 v9fs_evict_inode+0x1fd/0x360 fs/9p/vfs_inode.c:352 evict+0x2aa/0x630 fs/inode.c:667 __dentry_kill+0x20d/0x630 fs/dcache.c:603 dput+0x19f/0x2b0 fs/dcache.c:845 shrink_dcache_for_umount+0x7d/0x130 fs/dcache.c:1555 generic_shutdown_super+0x6a/0x2d0 fs/super.c:620 kill_anon_super+0x3b/0x70 fs/super.c:1226 v9fs_kill_super+0x4c/0x90 fs/9p/vfs_super.c:193 deactivate_locked_super+0xc6/0x130 fs/super.c:473 cleanup_mnt+0x41f/0x4b0 fs/namespace.c:1267 task_work_run+0x251/0x310 kernel/task_work.c:180 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline] exit_to_user_mode_loop kernel/entry/common.c:114 [inline] exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline] __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline] syscall_exit_to_user_mode+0x168/0x360 kernel/entry/common.c:218 do_syscall_64+0x100/0x230 arch/x86/entry/common.c:89 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7ff087976ec7 RSP: 002b:00007ffe797d4478 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00007ff087976ec7 RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffe797d4530 RBP: 00007ffe797d4530 R08: 0000000000000000 R09: 0000000000000000 R10: 00000000ffffffff R11: 0000000000000246 R12: 00007ffe797d5600 R13: 00007ff0879e3515 R14: 0000000000038e79 R15: 0000000000000019 Showing all locks held in the system: 2 locks held by kworker/u8:1/12: 1 lock held by khungtaskd/30: #0: ffffffff8e333f20 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:329 [inline] #0: ffffffff8e333f20 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:781 [inline] #0: ffffffff8e333f20 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x55/0x2a0 kernel/locking/lockdep.c:6614 4 locks held by kworker/u8:6/1257: #0: ffff888015ed5948 ((wq_completion)netns){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3223 [inline] #0: ffff888015ed5948 ((wq_completion)netns){+.+.}-{0:0}, at: process_scheduled_works+0x90a/0x1830 kernel/workqueue.c:3329 #1: ffffc90004eb7d00 (net_cleanup_work){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3224 [inline] #1: ffffc90004eb7d00 (net_cleanup_work){+.+.}-{0:0}, at: process_scheduled_works+0x945/0x1830 kernel/workqueue.c:3329 #2: ffffffff8f5da690 (pernet_ops_rwsem){++++}-{3:3}, at: cleanup_net+0x16a/0xcc0 net/core/net_namespace.c:594 #3: ffffffff8f5e6ec8 (rtnl_mutex){+.+.}-{3:3}, at: fib6_rules_net_exit_batch+0x20/0xc0 net/ipv6/fib6_rules.c:510 3 locks held by kworker/u8:10/2857: #0: ffff888029d27148 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3223 [inline] #0: ffff888029d27148 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_scheduled_works+0x90a/0x1830 kernel/workqueue.c:3329 #1: ffffc90009e17d00 ((work_completion)(&(&ifa->dad_work)->work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3224 [inline] #1: ffffc90009e17d00 ((work_completion)(&(&ifa->dad_work)->work)){+.+.}-{0:0}, at: process_scheduled_works+0x945/0x1830 kernel/workqueue.c:3329 #2: ffffffff8f5e6ec8 (rtnl_mutex){+.+.}-{3:3}, at: addrconf_dad_work+0xd0/0x16f0 net/ipv6/addrconf.c:4193 2 locks held by getty/4849: #0: ffff88802ac7a0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243 #1: ffffc900031332f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x6b5/0x1e10 drivers/tty/n_tty.c:2211 3 locks held by kworker/0:3/5158: 3 locks held by kworker/1:9/5161: #0: ffff888015078948 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3223 [inline] #0: ffff888015078948 ((wq_completion)events){+.+.}-{0:0}, at: process_scheduled_works+0x90a/0x1830 kernel/workqueue.c:3329 #1: ffffc90004ee7d00 ((work_completion)(&data->fib_event_work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3224 [inline] #1: ffffc90004ee7d00 ((work_completion)(&data->fib_event_work)){+.+.}-{0:0}, at: process_scheduled_works+0x945/0x1830 kernel/workqueue.c:3329 #2: ffff88804b518240 (&data->fib_lock){+.+.}-{3:3}, at: nsim_fib_event_work+0x2d1/0x4130 drivers/net/netdevsim/fib.c:1489 3 locks held by kworker/0:4/5186: 3 locks held by kworker/0:6/5195: #0: ffff888015078948 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3223 [inline] #0: ffff888015078948 ((wq_completion)events){+.+.}-{0:0}, at: process_scheduled_works+0x90a/0x1830 kernel/workqueue.c:3329 #1: ffffc90004da7d00 ((linkwatch_work).work){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3224 [inline] #1: ffffc90004da7d00 ((linkwatch_work).work){+.+.}-{0:0}, at: process_scheduled_works+0x945/0x1830 kernel/workqueue.c:3329 #2: ffffffff8f5e6ec8 (rtnl_mutex){+.+.}-{3:3}, at: linkwatch_event+0xe/0x60 net/core/link_watch.c:276 3 locks held by kworker/0:7/5519: 1 lock held by syz-executor/6810: #0: ffff88802faf00e0 (&type->s_umount_key#55){++++}-{3:3}, at: __super_lock fs/super.c:56 [inline] #0: ffff88802faf00e0 (&type->s_umount_key#55){++++}-{3:3}, at: __super_lock_excl fs/super.c:71 [inline] #0: ffff88802faf00e0 (&type->s_umount_key#55){++++}-{3:3}, at: deactivate_super+0xb5/0xf0 fs/super.c:505 1 lock held by syz.3.877/8624: #0: ffff88802faf00e0 (&type->s_umount_key#55){++++}-{3:3}, at: __super_lock fs/super.c:58 [inline] #0: ffff88802faf00e0 (&type->s_umount_key#55){++++}-{3:3}, at: super_lock+0x27c/0x400 fs/super.c:120 1 lock held by syz-executor/8998: #0: ffffffff8f5e6ec8 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:79 [inline] #0: ffffffff8f5e6ec8 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x842/0x1180 net/core/rtnetlink.c:6632 1 lock held by syz-executor/9125: #0: ffffffff8f5e6ec8 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:79 [inline] #0: ffffffff8f5e6ec8 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x842/0x1180 net/core/rtnetlink.c:6632 1 lock held by syz-executor/9161: #0: ffffffff8f5e6ec8 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:79 [inline] #0: ffffffff8f5e6ec8 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x842/0x1180 net/core/rtnetlink.c:6632 1 lock held by syz.2.1088/9285: #0: ffff88802faf00e0 (&type->s_umount_key#55){++++}-{3:3}, at: __super_lock fs/super.c:58 [inline] #0: ffff88802faf00e0 (&type->s_umount_key#55){++++}-{3:3}, at: super_lock+0x27c/0x400 fs/super.c:120 1 lock held by syz-executor/9340: 4 locks held by syz.3.1112/9370: 3 locks held by syz.3.1112/9371: #0: ffffffff8eb0b448 (tty_mutex){+.+.}-{3:3}, at: tty_open_by_driver drivers/tty/tty_io.c:2052 [inline] #0: ffffffff8eb0b448 (tty_mutex){+.+.}-{3:3}, at: tty_open+0x23e/0xdf0 drivers/tty/tty_io.c:2135 #1: ffff88805fc011c0 (&tty->legacy_mutex){+.+.}-{3:3}, at: tty_init_dev+0x78/0x4c0 drivers/tty/tty_io.c:1421 #2: ffffffff8e20fa60 (console_lock){+.+.}-{0:0}, at: con_install+0x99/0x7f0 drivers/tty/vt/vt.c:3517 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 30 Comm: khungtaskd Not tainted 6.10.0-rc6-syzkaller-00061-ge9d22f7a6655 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:114 nmi_cpu_backtrace+0x49c/0x4d0 lib/nmi_backtrace.c:113 nmi_trigger_cpumask_backtrace+0x198/0x320 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:162 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:223 [inline] watchdog+0xfde/0x1020 kernel/hung_task.c:379 kthread+0x2f2/0x390 kernel/kthread.c:389 ret_from_fork+0x4d/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 9370 Comm: syz.3.1112 Not tainted 6.10.0-rc6-syzkaller-00061-ge9d22f7a6655 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024 RIP: 0010:__import_iovec+0x41/0x820 lib/iov_iter.c:1278 Code: 89 c5 89 cb 89 d5 49 89 f7 89 7c 24 0c 44 0f b6 b4 24 80 00 00 00 e8 ee c3 e8 fc bf 01 00 00 00 89 ee e8 22 c8 e8 fc 83 fd 01 <0f> 85 a6 00 00 00 49 bc 00 00 00 00 00 fc ff df 4c 89 eb 49 c1 ed RSP: 0018:ffffc90009ae7888 EFLAGS: 00000297 RAX: 0000000000000002 RBX: 0000000000000008 RCX: 0000000000040000 RDX: ffff88801a7d9e00 RSI: 0000000000000000 RDI: 0000000000000001 RBP: 0000000000000000 R08: ffffffff84ad636e R09: ffffc90009ae7d10 R10: dffffc0000000000 R11: fffff5200135cfac R12: 0000000000000000 R13: ffffc90009ae7be0 R14: 0000000000000000 R15: 0000000000000000 FS: 00007f2e8572e6c0(0000) GS:ffff8880b9400000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b2de1bff8 CR3: 0000000050d1a000 CR4: 0000000000350ef0 Call Trace: import_iovec+0xeb/0x120 lib/iov_iter.c:1346 copy_msghdr_from_user+0x52f/0x680 net/socket.c:2522 recvmsg_copy_msghdr net/socket.c:2770 [inline] ___sys_recvmsg net/socket.c:2842 [inline] do_recvmmsg+0x40f/0xae0 net/socket.c:2940 __sys_recvmmsg net/socket.c:3019 [inline] __do_sys_recvmmsg net/socket.c:3042 [inline] __se_sys_recvmmsg net/socket.c:3035 [inline] __x64_sys_recvmmsg+0x199/0x250 net/socket.c:3035 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f2e84975b99 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f2e8572e048 EFLAGS: 00000246 ORIG_RAX: 000000000000012b RAX: ffffffffffffffda RBX: 00007f2e84b04038 RCX: 00007f2e84975b99 RDX: 0000000000010106 RSI: 00000000200000c0 RDI: 0000000000000003 RBP: 00007f2e849e4a7a R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000002 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000006e R14: 00007f2e84b04038 R15: 00007fffbda0c1c8