syzbot

INFO: task syz.1.920:9049 blocked for more than 143 seconds.
      Not tainted 6.12.0-rc3-syzkaller-00087-gc964ced77262 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.1.920       state:D stack:25824 pid:9049  tgid:9049  ppid:8622   flags:0x00004004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5322 [inline]
 __schedule+0xef5/0x5750 kernel/sched/core.c:6682
 __schedule_loop kernel/sched/core.c:6759 [inline]
 schedule+0xe7/0x350 kernel/sched/core.c:6774
 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6831
 __mutex_lock_common kernel/locking/mutex.c:684 [inline]
 __mutex_lock+0x5b8/0x9c0 kernel/locking/mutex.c:752
 hugetlb_wp+0x1b4a/0x3320 mm/hugetlb.c:5894
 hugetlb_fault+0x2248/0x2fa0 mm/hugetlb.c:6454
 handle_mm_fault+0x930/0xaa0 mm/memory.c:6060
 do_user_addr_fault+0x60d/0x13f0 arch/x86/mm/fault.c:1338
 handle_page_fault arch/x86/mm/fault.c:1481 [inline]
 exc_page_fault+0x5c/0xc0 arch/x86/mm/fault.c:1539
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623
RIP: 0033:0x7fd38ca45221
RSP: 002b:00007fff6ef2b0b0 EFLAGS: 00010246
RAX: 0000000020000540 RBX: 0000000000000004 RCX: 0000000000000000
RDX: 0000000000000084 RSI: 0000000000000000 RDI: 00005555898a23c8
RBP: 00007fff6ef2b1c8 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000001 R12: 000000000008ccf1
R13: 00007fff6ef2b1f0 R14: 0000000000000032 R15: fffffffffffffffe
 </TASK>
INFO: task syz.1.920:9052 blocked for more than 144 seconds.
      Not tainted 6.12.0-rc3-syzkaller-00087-gc964ced77262 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.1.920       state:D stack:27600 pid:9052  tgid:9049  ppid:8622   flags:0x00004006
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5322 [inline]
 __schedule+0xef5/0x5750 kernel/sched/core.c:6682
 __schedule_loop kernel/sched/core.c:6759 [inline]
 schedule+0xe7/0x350 kernel/sched/core.c:6774
 io_schedule+0xbf/0x130 kernel/sched/core.c:7559
 folio_wait_bit_common+0x3d8/0x9b0 mm/filemap.c:1309
 __folio_lock mm/filemap.c:1647 [inline]
 folio_lock include/linux/pagemap.h:1148 [inline]
 folio_lock include/linux/pagemap.h:1144 [inline]
 __filemap_get_folio+0x6a4/0xaf0 mm/filemap.c:1900
 filemap_lock_folio include/linux/pagemap.h:788 [inline]
 filemap_lock_hugetlb_folio include/linux/hugetlb.h:795 [inline]
 hugetlb_fault+0x16ff/0x2fa0 mm/hugetlb.c:6406
 handle_mm_fault+0x930/0xaa0 mm/memory.c:6060
 do_user_addr_fault+0x7a3/0x13f0 arch/x86/mm/fault.c:1389
 handle_page_fault arch/x86/mm/fault.c:1481 [inline]
 exc_page_fault+0x5c/0xc0 arch/x86/mm/fault.c:1539
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623
RIP: 0010:rep_movs_alternative+0x33/0x70 arch/x86/lib/copy_user_64.S:58
Code: 40 83 f9 08 73 21 85 c9 74 0f 8a 06 88 07 48 ff c7 48 ff c6 48 ff c9 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
RSP: 0018:ffffc90004cb7c48 EFLAGS: 00050246
RAX: 0000000000000000 RBX: 0000000000000008 RCX: 0000000000000008
RDX: fffff52000996f98 RSI: ffffc90004cb7cb8 RDI: 0000000020022850
RBP: 0000000020022850 R08: 0000000000000000 R09: fffff52000996f97
R10: ffffc90004cb7cbf R11: 0000000000000000 R12: ffffc90004cb7cb8
R13: 0000000020022858 R14: 0000000000000000 R15: 0000000020019680
 copy_user_generic arch/x86/include/asm/uaccess_64.h:121 [inline]
 raw_copy_to_user arch/x86/include/asm/uaccess_64.h:142 [inline]
 _inline_copy_to_user include/linux/uaccess.h:188 [inline]
 _copy_to_user+0xac/0xc0 lib/usercopy.c:26
 copy_to_user include/linux/uaccess.h:216 [inline]
 msr_read+0x14f/0x250 arch/x86/kernel/msr.c:69
 vfs_read+0x1ce/0xbd0 fs/read_write.c:567
 ksys_read+0x12f/0x260 fs/read_write.c:712
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fd38cb7dff9
RSP: 002b:00007fd38d975038 EFLAGS: 00000246 ORIG_RAX: 0000000000000000
RAX: ffffffffffffffda RBX: 00007fd38cd35f80 RCX: 00007fd38cb7dff9
RDX: 0000000000018ff8 RSI: 0000000020019680 RDI: 0000000000000004
RBP: 00007fd38cbf0296 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007fd38cd35f80 R15: 00007fff6ef2af88
 </TASK>

Showing all locks held in the system:
3 locks held by kworker/u8:0/11:
1 lock held by khungtaskd/30:
 #0: ffffffff8e1b8340 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:337 [inline]
 #0: ffffffff8e1b8340 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
 #0: ffffffff8e1b8340 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x7f/0x390 kernel/locking/lockdep.c:6720
3 locks held by kworker/u8:5/1829:
 #0: ffff88802e57e148 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work+0x129b/0x1ba0 kernel/workqueue.c:3204
 #1: ffffc90004e6fd80 ((work_completion)(&(&ifa->dad_work)->work)){+.+.}-{0:0}, at: process_one_work+0x921/0x1ba0 kernel/workqueue.c:3205
 #2: ffffffff8fee21a8 (rtnl_mutex){+.+.}-{3:3}, at: addrconf_dad_work+0xcf/0x14d0 net/ipv6/addrconf.c:4196
3 locks held by kworker/1:2/2639:
 #0: ffff88801b080948 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x129b/0x1ba0 kernel/workqueue.c:3204
 #1: ffffc90009df7d80 (free_ipc_work){+.+.}-{0:0}, at: process_one_work+0x921/0x1ba0 kernel/workqueue.c:3205
 #2: ffffffff8e1c3c38 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock+0x282/0x3b0 kernel/rcu/tree_exp.h:297
4 locks held by kworker/u8:7/3376:
2 locks held by getty/4977:
 #0: ffff88802f01f0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x24/0x80 drivers/tty/tty_ldisc.c:243
 #1: ffffc90002f062f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0xfba/0x1480 drivers/tty/n_tty.c:2211
3 locks held by kworker/u8:11/6545:
 #0: ffff88801b089148 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work+0x129b/0x1ba0 kernel/workqueue.c:3204
 #1: ffffc900037bfd80 ((linkwatch_work).work){+.+.}-{0:0}, at: process_one_work+0x921/0x1ba0 kernel/workqueue.c:3205
 #2: ffffffff8fee21a8 (rtnl_mutex){+.+.}-{3:3}, at: linkwatch_event+0x51/0xc0 net/core/link_watch.c:276
2 locks held by syz.1.920/9049:
 #0: ffff88807a540b68 (&vma->vm_lock->lock){++++}-{3:3}, at: vma_start_read include/linux/mm.h:704 [inline]
 #0: ffff88807a540b68 (&vma->vm_lock->lock){++++}-{3:3}, at: lock_vma_under_rcu+0x13e/0x980 mm/memory.c:6228
 #1: ffff888020eca3c8 (&hugetlb_fault_mutex_table[i]){+.+.}-{3:3}, at: hugetlb_wp+0x1b4a/0x3320 mm/hugetlb.c:5894
3 locks held by syz.1.920/9052:
 #0: ffff88803039cd98 (&mm->mmap_lock){++++}-{3:3}, at: mmap_read_lock_killable include/linux/mmap_lock.h:153 [inline]
 #0: ffff88803039cd98 (&mm->mmap_lock){++++}-{3:3}, at: get_mmap_lock_carefully mm/memory.c:6108 [inline]
 #0: ffff88803039cd98 (&mm->mmap_lock){++++}-{3:3}, at: lock_mm_and_find_vma+0x3a9/0x6a0 mm/memory.c:6159
 #1: ffff888020eca3c8 (&hugetlb_fault_mutex_table[i]){+.+.}-{3:3}, at: hugetlb_fault+0x307/0x2fa0 mm/hugetlb.c:6326
 #2: ffff88806afe9ce8 (&resv_map->rw_sema){++++}-{3:3}, at: hugetlb_vma_lock_read mm/hugetlb.c:276 [inline]
 #2: ffff88806afe9ce8 (&resv_map->rw_sema){++++}-{3:3}, at: hugetlb_vma_lock_read+0x105/0x140 mm/hugetlb.c:267
3 locks held by syz.0.940/9153:
 #0: ffff88806c5954a8 (&vma->vm_lock->lock){++++}-{3:3}, at: vma_start_read include/linux/mm.h:704 [inline]
 #0: ffff88806c5954a8 (&vma->vm_lock->lock){++++}-{3:3}, at: lock_vma_under_rcu+0x13e/0x980 mm/memory.c:6228
 #1: ffff88806cce0fb8 (&ctx->map_changing_lock){++++}-{3:3}, at: mfill_atomic_hugetlb mm/userfaultfd.c:560 [inline]
 #1: ffff88806cce0fb8 (&ctx->map_changing_lock){++++}-{3:3}, at: mfill_atomic mm/userfaultfd.c:769 [inline]
 #1: ffff88806cce0fb8 (&ctx->map_changing_lock){++++}-{3:3}, at: mfill_atomic_copy+0x1aca/0x1e70 mm/userfaultfd.c:868
 #2: ffff888020eca3c8 (&hugetlb_fault_mutex_table[i]){+.+.}-{3:3}, at: mfill_atomic_hugetlb mm/userfaultfd.c:578 [inline]
 #2: ffff888020eca3c8 (&hugetlb_fault_mutex_table[i]){+.+.}-{3:3}, at: mfill_atomic mm/userfaultfd.c:769 [inline]
 #2: ffff888020eca3c8 (&hugetlb_fault_mutex_table[i]){+.+.}-{3:3}, at: mfill_atomic_copy+0x162c/0x1e70 mm/userfaultfd.c:868
3 locks held by syz.4.955/9255:
 #0: ffff888025c9d9b8 (&vma->vm_lock->lock){++++}-{3:3}, at: vma_start_read include/linux/mm.h:704 [inline]
 #0: ffff888025c9d9b8 (&vma->vm_lock->lock){++++}-{3:3}, at: lock_vma_under_rcu+0x13e/0x980 mm/memory.c:6228
 #1: ffff888020f58a38 (&ctx->map_changing_lock){++++}-{3:3}, at: mfill_atomic mm/userfaultfd.c:744 [inline]
 #1: ffff888020f58a38 (&ctx->map_changing_lock){++++}-{3:3}, at: mfill_atomic_copy+0x26c/0x1e70 mm/userfaultfd.c:868
 #2: ffff888020eca3c8 (&hugetlb_fault_mutex_table[i]){+.+.}-{3:3}, at: mfill_atomic_hugetlb mm/userfaultfd.c:578 [inline]
 #2: ffff888020eca3c8 (&hugetlb_fault_mutex_table[i]){+.+.}-{3:3}, at: mfill_atomic mm/userfaultfd.c:769 [inline]
 #2: ffff888020eca3c8 (&hugetlb_fault_mutex_table[i]){+.+.}-{3:3}, at: mfill_atomic_copy+0x162c/0x1e70 mm/userfaultfd.c:868
1 lock held by syz-executor/9680:
 #0: ffffffff8fee21a8 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:79 [inline]
 #0: ffffffff8fee21a8 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x372/0xea0 net/core/rtnetlink.c:6672
4 locks held by syz-executor/9792:
 #0: ffff888024126420 (sb_writers#9){.+.+}-{0:0}, at: ksys_write+0x12f/0x260 fs/read_write.c:736
 #1: ffff88804acc2088 (&of->mutex){+.+.}-{3:3}, at: kernfs_fop_write_iter+0x27b/0x500 fs/kernfs/file.c:325
 #2: ffff888027b38878 (kn->active#50){.+.+}-{0:0}, at: kernfs_fop_write_iter+0x29e/0x500 fs/kernfs/file.c:326
 #3: ffffffff8f47bc88 (nsim_bus_dev_list_lock){+.+.}-{3:3}, at: new_device_store+0x187/0x730 drivers/net/netdevsim/bus.c:166
7 locks held by syz-executor/9895:
 #0: ffff888024126420 (sb_writers#9){.+.+}-{0:0}, at: ksys_write+0x12f/0x260 fs/read_write.c:736
 #1: ffff88805f12b488 (&of->mutex){+.+.}-{3:3}, at: kernfs_fop_write_iter+0x27b/0x500 fs/kernfs/file.c:325
 #2: ffff888027b38968 (kn->active#49){.+.+}-{0:0}, at: kernfs_fop_write_iter+0x29e/0x500 fs/kernfs/file.c:326
 #3: ffffffff8f47bc88 (nsim_bus_dev_list_lock){+.+.}-{3:3}, at: del_device_store+0xd2/0x4b0 drivers/net/netdevsim/bus.c:216
 #4: ffff88805f0b20e8 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:1014 [inline]
 #4: ffff88805f0b20e8 (&dev->mutex){....}-{3:3}, at: __device_driver_lock drivers/base/dd.c:1095 [inline]
 #4: ffff88805f0b20e8 (&dev->mutex){....}-{3:3}, at: device_release_driver_internal+0xa4/0x610 drivers/base/dd.c:1293
 #5: ffff88805f0b3250 (&devlink->lock_key#26){+.+.}-{3:3}, at: nsim_drv_remove+0x4a/0x1d0 drivers/net/netdevsim/dev.c:1672
 #6: ffffffff8fee21a8 (rtnl_mutex){+.+.}-{3:3}, at: nsim_destroy+0x6f/0x6b0 drivers/net/netdevsim/netdev.c:773
2 locks held by syz.3.1080/10097:
 #0: ffffffff8fecc810 (pernet_ops_rwsem){++++}-{3:3}, at: copy_net_ns+0x292/0x6b0 net/core/net_namespace.c:490
 #1: ffffffff8fee21a8 (rtnl_mutex){+.+.}-{3:3}, at: register_nexthop_notifier+0x1b/0x70 net/ipv4/nexthop.c:3885
3 locks held by syz.1.1082/10107:
 #0: ffff88806b6c4d80 (&hdev->req_lock){+.+.}-{3:3}, at: hci_dev_do_close+0x26/0x90 net/bluetooth/hci_core.c:481
 #1: ffff88806b6c4078 (&hdev->lock){+.+.}-{3:3}, at: hci_dev_close_sync+0x346/0x1110 net/bluetooth/hci_sync.c:5183
 #2: ffffffff9014a9e8 (hci_cb_list_lock){+.+.}-{3:3}, at: hci_disconn_cfm include/net/bluetooth/hci_core.h:1972 [inline]
 #2: ffffffff9014a9e8 (hci_cb_list_lock){+.+.}-{3:3}, at: hci_conn_hash_flush+0xc4/0x260 net/bluetooth/hci_conn.c:2592

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

NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 30 Comm: khungtaskd Not tainted 6.12.0-rc3-syzkaller-00087-gc964ced77262 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120
 nmi_cpu_backtrace+0x27b/0x390 lib/nmi_backtrace.c:113
 nmi_trigger_cpumask_backtrace+0x29c/0x300 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+0xf0c/0x1240 kernel/hung_task.c:379
 kthread+0x2c1/0x3a0 kernel/kthread.c:389
 ret_from_fork+0x45/0x80 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: 11 Comm: kworker/u8:0 Not tainted 6.12.0-rc3-syzkaller-00087-gc964ced77262 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
Workqueue: bat_events batadv_nc_worker
RIP: 0010:lockdep_enabled kernel/locking/lockdep.c:122 [inline]
RIP: 0010:lock_release+0x129/0x6f0 kernel/locking/lockdep.c:5838
Code: 0f 85 d6 02 00 00 65 4c 8b 35 d3 35 99 7e 49 8d be dc 0a 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 0f b6 14 02 <48> 89 f8 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 59 05 00 00 41
RSP: 0018:ffffc90000107ac8 EFLAGS: 00000a07
RAX: dffffc0000000000 RBX: 1ffff92000020f5b RCX: ffffffff816aa589
RDX: 0000000000000000 RSI: ffffffff8bd1a780 RDI: ffff88801d6bc6dc
RBP: ffffffff905f7cd8 R08: 0000000000000000 R09: fffffbfff20be939
R10: ffffffff905f49cf R11: 0000000000000000 R12: ffffffff8e1b8340
R13: 000000000003dbcc R14: ffff88801d6bbc00 R15: dffffc0000000000
FS:  0000000000000000(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000556ada10c300 CR3: 00000000324de000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <NMI>
 </NMI>
 <TASK>
 rcu_lock_release include/linux/rcupdate.h:347 [inline]
 rcu_read_unlock include/linux/rcupdate.h:880 [inline]
 batadv_nc_purge_orig_hash net/batman-adv/network-coding.c:412 [inline]
 batadv_nc_worker+0x88c/0x1060 net/batman-adv/network-coding.c:719
 process_one_work+0x9c5/0x1ba0 kernel/workqueue.c:3229
 process_scheduled_works kernel/workqueue.c:3310 [inline]
 worker_thread+0x6c8/0xf00 kernel/workqueue.c:3391
 kthread+0x2c1/0x3a0 kernel/kthread.c:389
 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>