INFO: task syz.1.989:10293 blocked for more than 143 seconds.
      Not tainted 6.11.0-rc7-syzkaller-00020-g8d8d276ba2fb #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.1.989       state:D stack:26264 pid:10293 tgid:10293 ppid:9017   flags:0x00004004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5188 [inline]
 __schedule+0x1800/0x4a60 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
 __mutex_lock_common kernel/locking/mutex.c:684 [inline]
 __mutex_lock+0x6a4/0xd70 kernel/locking/mutex.c:752
 hugetlb_wp+0x104d/0x3a90 mm/hugetlb.c:6027
 hugetlb_fault+0x27b2/0x3770 mm/hugetlb.c:6579
 handle_mm_fault+0x1901/0x1bc0 mm/memory.c:5830
 do_user_addr_fault arch/x86/mm/fault.c:1338 [inline]
 handle_page_fault arch/x86/mm/fault.c:1481 [inline]
 exc_page_fault+0x459/0x8c0 arch/x86/mm/fault.c:1539
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623
RIP: 0033:0x7fb5d4b4597c
RSP: 002b:00007fb5d4e5fb88 EFLAGS: 00010246
RAX: 0000000020000d00 RBX: 0000000000000004 RCX: 8000000000000010
RDX: 0000000000000010 RSI: 00007fb5d46005d5 RDI: 0000000020000d00
RBP: 00007fb5d4d37a80 R08: 00007fb5d4a00000 R09: 0000000000000001
R10: 0000000000000001 R11: 0000000000000009 R12: 000000000006025a
R13: 00007fb5d4e5fc90 R14: 0000000000000032 R15: fffffffffffffffe
 </TASK>
INFO: task syz.1.989:10294 blocked for more than 144 seconds.
      Not tainted 6.11.0-rc7-syzkaller-00020-g8d8d276ba2fb #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.1.989       state:D stack:26480 pid:10294 tgid:10293 ppid:9017   flags:0x00004006
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5188 [inline]
 __schedule+0x1800/0x4a60 kernel/sched/core.c:6529
 __schedule_loop kernel/sched/core.c:6606 [inline]
 schedule+0x14b/0x320 kernel/sched/core.c:6621
 io_schedule+0x8d/0x110 kernel/sched/core.c:7401
 folio_wait_bit_common+0x882/0x12b0 mm/filemap.c:1307
 __filemap_get_folio+0xb7/0xc10 mm/filemap.c:1898
 hugetlb_fault+0x1b72/0x3770 mm/hugetlb.c:6531
 handle_mm_fault+0x1901/0x1bc0 mm/memory.c:5830
 do_user_addr_fault arch/x86/mm/fault.c:1389 [inline]
 handle_page_fault arch/x86/mm/fault.c:1481 [inline]
 exc_page_fault+0x2b9/0x8c0 arch/x86/mm/fault.c:1539
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623
RIP: 0010:rep_movs_alternative+0x4a/0x70 arch/x86/lib/copy_user_64.S:71
Code: 75 f1 c3 cc cc cc cc 66 0f 1f 84 00 00 00 00 00 48 8b 06 48 89 07 48 83 c6 08 48 83 c7 08 83 e9 08 74 df 83 f9 08 73 e8 eb c9 <f3> a4 c3 cc cc cc cc 48 89 c8 48 c1 e9 03 83 e0 07 f3 48 a5 89 c1
RSP: 0018:ffffc90004b6fad0 EFLAGS: 00050246
RAX: ffffffff84b29701 RBX: 00000000200139c0 RCX: 0000000000000040
RDX: 0000000000000000 RSI: ffffc90004b6fb60 RDI: 0000000020013980
RBP: ffffc90004b6fc10 R08: ffffc90004b6fb9f R09: 1ffff9200096df73
R10: dffffc0000000000 R11: fffff5200096df74 R12: 0000000000000040
R13: 0000000000013340 R14: 0000000020013980 R15: ffffc90004b6fb60
 copy_user_generic arch/x86/include/asm/uaccess_64.h:110 [inline]
 raw_copy_to_user arch/x86/include/asm/uaccess_64.h:131 [inline]
 _inline_copy_to_user include/linux/uaccess.h:181 [inline]
 _copy_to_user+0x86/0xb0 lib/usercopy.c:26
 copy_to_user include/linux/uaccess.h:209 [inline]
 rng_dev_read+0x3be/0x6d0 drivers/char/hw_random/core.c:251
 do_loop_readv_writev fs/read_write.c:761 [inline]
 vfs_readv+0x6c2/0xa90 fs/read_write.c:934
 do_preadv fs/read_write.c:1049 [inline]
 __do_sys_preadv fs/read_write.c:1099 [inline]
 __se_sys_preadv fs/read_write.c:1094 [inline]
 __x64_sys_preadv+0x1c7/0x2d0 fs/read_write.c:1094
 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: 0033:0x7fb5d4b7def9
RSP: 002b:00007fb5d5a63038 EFLAGS: 00000246 ORIG_RAX: 0000000000000127
RAX: ffffffffffffffda RBX: 00007fb5d4d35f80 RCX: 00007fb5d4b7def9
RDX: 0000000000000002 RSI: 0000000020000580 RDI: 0000000000000005
RBP: 00007fb5d4bf0b56 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007fb5d4d35f80 R15: 00007fb5d4e5fa28
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/30:
 #0: ffffffff8e938320 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:326 [inline]
 #0: ffffffff8e938320 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:838 [inline]
 #0: ffffffff8e938320 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x55/0x2a0 kernel/locking/lockdep.c:6626
2 locks held by getty/4987:
 #0: ffff8880353a20a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
 #1: ffffc9000311b2f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x6ac/0x1e00 drivers/tty/n_tty.c:2211
2 locks held by syz.1.989/10293:
 #0: ffff88805adc5df0 (&vma->vm_lock->lock){++++}-{3:3}, at: vma_start_read include/linux/mm.h:694 [inline]
 #0: ffff88805adc5df0 (&vma->vm_lock->lock){++++}-{3:3}, at: lock_vma_under_rcu+0x2f9/0x6e0 mm/memory.c:5998
 #1: ffff888021a80458 (&hugetlb_fault_mutex_table[i]){+.+.}-{3:3}, at: hugetlb_wp+0x104d/0x3a90 mm/hugetlb.c:6027
3 locks held by syz.1.989/10294:
 #0: ffff888032a4a798 (&mm->mmap_lock){++++}-{3:3}, at: mmap_read_lock_killable+0x1d/0x70 include/linux/mmap_lock.h:153
 #1: ffff888021a80458 (&hugetlb_fault_mutex_table[i]){+.+.}-{3:3}, at: hugetlb_fault+0x56f/0x3770 mm/hugetlb.c:6451
 #2: ffff88806199ace8 (&resv_map->rw_sema){++++}-{3:3}, at: hugetlb_fault+0x675/0x3770 mm/hugetlb.c:6458
2 locks held by syz.4.1488/12802:
 #0: ffff88806be870a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
 #1: ffff88806be87130 (&tty->atomic_write_lock){+.+.}-{3:3}, at: tty_write_lock drivers/tty/tty_io.c:954 [inline]
 #1: ffff88806be87130 (&tty->atomic_write_lock){+.+.}-{3:3}, at: iterate_tty_write drivers/tty/tty_io.c:973 [inline]
 #1: ffff88806be87130 (&tty->atomic_write_lock){+.+.}-{3:3}, at: file_tty_write+0x1f3/0x9c0 drivers/tty/tty_io.c:1096
1 lock held by syz.0.1490/12820:

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

NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 30 Comm: khungtaskd Not tainted 6.11.0-rc7-syzkaller-00020-g8d8d276ba2fb #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024
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+0xff4/0x1040 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: 3984 Comm: kworker/u8:10 Not tainted 6.11.0-rc7-syzkaller-00020-g8d8d276ba2fb #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024
Workqueue: bat_events batadv_nc_worker
RIP: 0010:lockdep_recursion_finish kernel/locking/lockdep.c:466 [inline]
RIP: 0010:lockdep_softirqs_on+0x34b/0x5a0 kernel/locking/lockdep.c:4506
Code: ff df e9 41 ff ff ff 48 c7 c7 e0 e6 0a 8c e8 4c 1e 4a 0a 48 ba 00 00 00 00 00 fc ff df b8 ff ff ff ff 65 0f c1 05 85 ef 92 7e <83> f8 01 4c 8b 64 24 18 0f 85 95 00 00 00 48 c7 44 24 20 0e 36 e0
RSP: 0018:ffffc9000c7ef940 EFLAGS: 00000057
RAX: 0000000000000001 RBX: 0000000000de40ac RCX: ffffffff9a33b903
RDX: dffffc0000000000 RSI: ffffffff8c0ae6e0 RDI: ffffffff8c608f40
RBP: ffffc9000c7ef9f0 R08: ffffffff901875ef R09: 1ffffffff2030ebd
R10: dffffc0000000000 R11: fffffbfff2030ebe R12: ffff888033718a78
R13: ffff888033718000 R14: ffff888033718aac R15: ffff888033718ac0
FS:  0000000000000000(0000) GS:ffff8880b8900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fd6b0907ab8 CR3: 000000000e734000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <NMI>
 </NMI>
 <TASK>
 __local_bh_enable_ip+0x123/0x200 kernel/softirq.c:370
 spin_unlock_bh include/linux/spinlock.h:396 [inline]
 batadv_nc_purge_paths+0x312/0x3b0 net/batman-adv/network-coding.c:471
 batadv_nc_worker+0x365/0x610 net/batman-adv/network-coding.c:722
 process_one_work kernel/workqueue.c:3231 [inline]
 process_scheduled_works+0xa2c/0x1830 kernel/workqueue.c:3312
 worker_thread+0x86d/0xd10 kernel/workqueue.c:3389
 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>