INFO: task syz.2.742:12696 blocked for more than 143 seconds.
      Not tainted 6.11.0-rc1-syzkaller-00272-g17712b7ea075 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.2.742       state:D stack:27424 pid:12696 tgid:12684 ppid:11340  flags:0x00004006
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5188 [inline]
 __schedule+0x17ae/0x4a10 kernel/sched/core.c:6529
 __schedule_loop kernel/sched/core.c:6606 [inline]
 schedule+0x14b/0x320 kernel/sched/core.c:6621
 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6678
 rwsem_down_write_slowpath+0xeeb/0x13b0 kernel/locking/rwsem.c:1178
 __down_write_common kernel/locking/rwsem.c:1306 [inline]
 __down_write kernel/locking/rwsem.c:1315 [inline]
 down_write+0x1d7/0x220 kernel/locking/rwsem.c:1580
 inode_lock include/linux/fs.h:799 [inline]
 chmod_common+0x1bb/0x4c0 fs/open.c:648
 do_fchmodat fs/open.c:702 [inline]
 __do_sys_fchmodat fs/open.c:721 [inline]
 __se_sys_fchmodat fs/open.c:718 [inline]
 __x64_sys_fchmodat+0x11d/0x1c0 fs/open.c:718
 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: 0033:0x7f1fb2b779f9
RSP: 002b:00007f1fb25de048 EFLAGS: 00000246 ORIG_RAX: 000000000000010c
RAX: ffffffffffffffda RBX: 00007f1fb2d06058 RCX: 00007f1fb2b779f9
RDX: 0000000000000000 RSI: 0000000020000000 RDI: ffffffffffffff9c
RBP: 00007f1fb2be58ee R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000006e R14: 00007f1fb2d06058 R15: 00007fff602385a8
 </TASK>
INFO: task syz.2.742:12699 blocked for more than 143 seconds.
      Not tainted 6.11.0-rc1-syzkaller-00272-g17712b7ea075 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.2.742       state:D stack:27424 pid:12699 tgid:12684 ppid:11340  flags:0x00004006
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5188 [inline]
 __schedule+0x17ae/0x4a10 kernel/sched/core.c:6529
 __schedule_loop kernel/sched/core.c:6606 [inline]
 schedule+0x14b/0x320 kernel/sched/core.c:6621
 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6678
 rwsem_down_write_slowpath+0xeeb/0x13b0 kernel/locking/rwsem.c:1178
 __down_write_common kernel/locking/rwsem.c:1306 [inline]
 __down_write kernel/locking/rwsem.c:1315 [inline]
 down_write_nested+0x1e0/0x220 kernel/locking/rwsem.c:1696
 inode_lock_nested include/linux/fs.h:834 [inline]
 filename_create+0x260/0x540 fs/namei.c:3979
 do_mknodat+0x18b/0x5b0 fs/namei.c:4125
 __do_sys_mknod fs/namei.c:4171 [inline]
 __se_sys_mknod fs/namei.c:4169 [inline]
 __x64_sys_mknod+0x8c/0xa0 fs/namei.c:4169
 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: 0033:0x7f1fb2b779f9
RSP: 002b:00007f1fb25bd048 EFLAGS: 00000246 ORIG_RAX: 0000000000000085
RAX: ffffffffffffffda RBX: 00007f1fb2d06130 RCX: 00007f1fb2b779f9
RDX: 0000000000000705 RSI: 0000000000000000 RDI: 0000000020000000
RBP: 00007f1fb2be58ee R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000006e R14: 00007f1fb2d06130 R15: 00007fff602385a8
 </TASK>
INFO: task syz.2.742:12700 blocked for more than 144 seconds.
      Not tainted 6.11.0-rc1-syzkaller-00272-g17712b7ea075 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.2.742       state:D stack:27424 pid:12700 tgid:12684 ppid:11340  flags:0x00000004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5188 [inline]
 __schedule+0x17ae/0x4a10 kernel/sched/core.c:6529
 __schedule_loop kernel/sched/core.c:6606 [inline]
 schedule+0x14b/0x320 kernel/sched/core.c:6621
 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6678
 rwsem_down_read_slowpath kernel/locking/rwsem.c:1086 [inline]
 __down_read_common kernel/locking/rwsem.c:1250 [inline]
 __down_read kernel/locking/rwsem.c:1263 [inline]
 down_read+0x705/0xa40 kernel/locking/rwsem.c:1528
 inode_lock_shared include/linux/fs.h:809 [inline]
 lookup_slow+0x45/0x70 fs/namei.c:1734
 walk_component+0x2e1/0x410 fs/namei.c:2039
 lookup_last fs/namei.c:2542 [inline]
 path_lookupat+0x16f/0x450 fs/namei.c:2566
 filename_lookup+0x256/0x610 fs/namei.c:2595
 do_linkat+0x13f/0x6f0 fs/namei.c:4742
 __do_sys_link fs/namei.c:4796 [inline]
 __se_sys_link fs/namei.c:4794 [inline]
 __x64_sys_link+0x82/0x90 fs/namei.c:4794
 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: 0033:0x7f1fb2b779f9
RSP: 002b:00007f1fb259c048 EFLAGS: 00000246 ORIG_RAX: 0000000000000056
RAX: ffffffffffffffda RBX: 00007f1fb2d06208 RCX: 00007f1fb2b779f9
RDX: 0000000000000000 RSI: 0000000020000bc0 RDI: 0000000020001240
RBP: 00007f1fb2be58ee R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000006e R14: 00007f1fb2d06208 R15: 00007fff602385a8
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/30:
 #0: ffffffff8e7377e0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:326 [inline]
 #0: ffffffff8e7377e0 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:838 [inline]
 #0: ffffffff8e7377e0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x55/0x2a0 kernel/locking/lockdep.c:6620
6 locks held by kworker/u8:2/35:
 #0: ffff8880162e3148 ((wq_completion)netns){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3206 [inline]
 #0: ffff8880162e3148 ((wq_completion)netns){+.+.}-{0:0}, at: process_scheduled_works+0x90a/0x1830 kernel/workqueue.c:3312
 #1: ffffc90000ab7d00 (net_cleanup_work){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3207 [inline]
 #1: ffffc90000ab7d00 (net_cleanup_work){+.+.}-{0:0}, at: process_scheduled_works+0x945/0x1830 kernel/workqueue.c:3312
 #2: ffffffff8fa61490 (pernet_ops_rwsem){++++}-{3:3}, at: cleanup_net+0x16a/0xcc0 net/core/net_namespace.c:594
 #3: ffff88804f22a0e8 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:1009 [inline]
 #3: ffff88804f22a0e8 (&dev->mutex){....}-{3:3}, at: devl_dev_lock net/devlink/devl_internal.h:108 [inline]
 #3: ffff88804f22a0e8 (&dev->mutex){....}-{3:3}, at: devlink_pernet_pre_exit+0x13b/0x440 net/devlink/core.c:506
 #4: ffff888069134250 (&devlink->lock_key#50){+.+.}-{3:3}, at: devl_lock net/devlink/core.c:276 [inline]
 #4: ffff888069134250 (&devlink->lock_key#50){+.+.}-{3:3}, at: devl_dev_lock net/devlink/devl_internal.h:109 [inline]
 #4: ffff888069134250 (&devlink->lock_key#50){+.+.}-{3:3}, at: devlink_pernet_pre_exit+0x14d/0x440 net/devlink/core.c:506
 #5: ffffffff8e73ca80 (rcu_state.barrier_mutex){+.+.}-{3:3}, at: rcu_barrier+0x4c/0x530 kernel/rcu/tree.c:4486
2 locks held by getty/4969:
 #0: ffff88802f8680a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
 #1: ffffc90002f162f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x6ac/0x1e00 drivers/tty/n_tty.c:2211
3 locks held by syz.2.742/12685:
2 locks held by syz.2.742/12696:
 #0: ffff888063c3e420 (sb_writers#4){.+.+}-{0:0}, at: mnt_want_write+0x3f/0x90 fs/namespace.c:515
 #1: ffff88805715ddb0 (&type->i_mutex_dir_key#3){++++}-{3:3}, at: inode_lock include/linux/fs.h:799 [inline]
 #1: ffff88805715ddb0 (&type->i_mutex_dir_key#3){++++}-{3:3}, at: chmod_common+0x1bb/0x4c0 fs/open.c:648
2 locks held by syz.2.742/12699:
 #0: ffff888063c3e420 (sb_writers#4){.+.+}-{0:0}, at: mnt_want_write+0x3f/0x90 fs/namespace.c:515
 #1: ffff88805715ddb0 (&type->i_mutex_dir_key#3/1){+.+.}-{3:3}, at: inode_lock_nested include/linux/fs.h:834 [inline]
 #1: ffff88805715ddb0 (&type->i_mutex_dir_key#3/1){+.+.}-{3:3}, at: filename_create+0x260/0x540 fs/namei.c:3979
1 lock held by syz.2.742/12700:
 #0: ffff88805715ddb0 (&type->i_mutex_dir_key#3){++++}-{3:3}, at: inode_lock_shared include/linux/fs.h:809 [inline]
 #0: ffff88805715ddb0 (&type->i_mutex_dir_key#3){++++}-{3:3}, at: lookup_slow+0x45/0x70 fs/namei.c:1734
2 locks held by syz-executor/14909:
 #0: ffffffff8fa6e008 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:79 [inline]
 #0: ffffffff8fa6e008 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x6e6/0xcf0 net/core/rtnetlink.c:6644
 #1: ffffffff8e73cbb8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:328 [inline]
 #1: ffffffff8e73cbb8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x451/0x830 kernel/rcu/tree_exp.h:958
1 lock held by dhcpcd-run-hook/14942:
 #0: ffff8880b933e9d8 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x2a/0x140 kernel/sched/core.c:560

=============================================

NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 30 Comm: khungtaskd Not tainted 6.11.0-rc1-syzkaller-00272-g17712b7ea075 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/27/2024
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:93 [inline]
 dump_stack_lvl+0x241/0x360 lib/dump_stack.c:119
 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+0xfee/0x1030 kernel/hung_task.c:379
 kthread+0x2f0/0x390 kernel/kthread.c:389
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 14945 Comm: rm Not tainted 6.11.0-rc1-syzkaller-00272-g17712b7ea075 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/27/2024
RIP: 0010:rcu_dynticks_curr_cpu_in_eqs include/linux/context_tracking.h:122 [inline]
RIP: 0010:rcu_is_watching+0x35/0xb0 kernel/rcu/tree.c:726
Code: 05 a8 26 8a 7e e8 3b 82 33 0a 89 c3 83 f8 08 73 7a 49 bf 00 00 00 00 00 fc ff df 4c 8d 34 dd 40 da 07 8e 4c 89 f0 48 c1 e8 03 <42> 80 3c 38 00 74 08 4c 89 f7 e8 bc d8 7d 00 48 c7 c3 78 7c 03 00
RSP: 0018:ffffc9000306fed8 EFLAGS: 00000802
RAX: 1ffffffff1c0fb49 RBX: 0000000000000001 RCX: ffffffff819adb1c
RDX: 0000000000000000 RSI: ffffffff8c3f88e0 RDI: ffffffff8c3f88a0
RBP: ffffc9000306ff48 R08: ffffffff8ff6816f R09: 1ffffffff1fed02d
R10: dffffc0000000000 R11: fffffbfff1fed02e R12: ffff88802981bc00
R13: 0000000000000000 R14: ffffffff8e07da48 R15: dffffc0000000000
FS:  0000000000000000(0000) GS:ffff8880b9300000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fd62d055270 CR3: 0000000079f04000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <NMI>
 </NMI>
 <TASK>
 trace_irq_disable+0x3b/0x120 include/trace/events/preemptirq.h:36
 enter_from_user_mode include/linux/entry-common.h:116 [inline]
 syscall_enter_from_user_mode include/linux/entry-common.h:194 [inline]
 do_syscall_64+0xaf/0x230 arch/x86/entry/common.c:79
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fd62d2fd8a9
Code: 49 01 00 09 00 00 00 83 c8 ff c3 48 89 f2 b9 00 01 00 00 48 89 fe bf 9c ff ff ff e9 00 00 00 00 41 89 ca b8 06 01 00 00 0f 05 <45> 31 c0 3d 00 f0 ff ff 76 0c f7 d8 41 83 c8 ff 89 05 a1 49 01 00
RSP: 002b:00007fff8698dbf8 EFLAGS: 00000246 ORIG_RAX: 0000000000000106
RAX: ffffffffffffffda RBX: 00007fd62d2d9050 RCX: 00007fd62d2fd8a9
RDX: 00007fff8698dca0 RSI: 00007fff8698dc00 RDI: 00000000ffffff9c
RBP: 00007fff8698dd60 R08: 0000000000080000 R09: 00007fff8698dc00
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fff8698dc00
R13: 0000000000000000 R14: 00007fd62d30fa40 R15: 00000000ffffffff
 </TASK>