INFO: task kworker/0:0:12910 blocked for more than 143 seconds.
      Tainted: G             L      syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/0:0     state:D stack:22688 pid:12910 tgid:12910 ppid:2      task_flags:0x4208060 flags:0x00080000
Workqueue: xfs-sync/loop5 xfs_flush_inodes_worker

Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5258 [inline]
 __schedule+0x150e/0x5070 kernel/sched/core.c:6866
 __schedule_loop kernel/sched/core.c:6948 [inline]
 schedule+0x165/0x360 kernel/sched/core.c:6963
 wb_wait_for_completion+0x360/0x680 fs/fs-writeback.c:226
 sync_inodes_sb+0x1c9/0xb40 fs/fs-writeback.c:2894
 xfs_flush_inodes_worker+0x61/0x80 fs/xfs/xfs_super.c:662
 process_one_work+0x93a/0x15a0 kernel/workqueue.c:3279
 process_scheduled_works kernel/workqueue.c:3362 [inline]
 worker_thread+0x9b0/0xee0 kernel/workqueue.c:3443
 kthread+0x711/0x8a0 kernel/kthread.c:463
 ret_from_fork+0x599/0xb30 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246
 </TASK>
INFO: task syz.5.1886:14908 blocked for more than 151 seconds.
      Tainted: G             L      syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.5.1886      state:D stack:21416 pid:14908 tgid:14907 ppid:14097  task_flags:0x400740 flags:0x00080002
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5258 [inline]
 __schedule+0x150e/0x5070 kernel/sched/core.c:6866
 __schedule_loop kernel/sched/core.c:6948 [inline]
 schedule+0x165/0x360 kernel/sched/core.c:6963
 schedule_timeout+0x9a/0x270 kernel/time/sleep_timeout.c:75
 do_wait_for_common kernel/sched/completion.c:100 [inline]
 __wait_for_common kernel/sched/completion.c:121 [inline]
 wait_for_common kernel/sched/completion.c:132 [inline]
 wait_for_completion+0x2bf/0x5d0 kernel/sched/completion.c:153
 __flush_work+0x9b9/0xbc0 kernel/workqueue.c:4331
 xfs_file_buffered_write+0x266/0x8a0 fs/xfs/xfs_file.c:1000
 __kernel_write_iter+0x428/0x910 fs/read_write.c:619
 dump_emit_page fs/coredump.c:1298 [inline]
 dump_user_range+0x8a0/0xc90 fs/coredump.c:1372
 elf_core_dump+0x3369/0x3960 fs/binfmt_elf.c:2111
 coredump_write+0x1121/0x18b0 fs/coredump.c:1049
 do_coredump fs/coredump.c:1126 [inline]
 vfs_coredump+0x3321/0x3e60 fs/coredump.c:1200
 get_signal+0x1108/0x1340 kernel/signal.c:3019
 arch_do_signal_or_restart+0x9a/0x7a0 arch/x86/kernel/signal.c:337
 __exit_to_user_mode_loop kernel/entry/common.c:41 [inline]
 exit_to_user_mode_loop+0x87/0x4f0 kernel/entry/common.c:75
 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:226 [inline]
 syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:256 [inline]
 syscall_exit_to_user_mode_work include/linux/entry-common.h:159 [inline]
 syscall_exit_to_user_mode include/linux/entry-common.h:194 [inline]
 do_syscall_64+0x2d0/0xf80 arch/x86/entry/syscall_64.c:100
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f7d5698f749
RSP: 002b:00007f7d5788f0e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: ffffffffffffffda RBX: 00007f7d56be5fa8 RCX: 00007f7d5698f749
RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 00007f7d56be5fac
RBP: 00007f7d56be5fa0 R08: 3fffffffffffffff R09: 0000000000000000
R10: 0000200000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f7d56be6038 R14: 00007ffc904ba960 R15: 00007ffc904baa48
 </TASK>

Showing all locks held in the system:
3 locks held by kworker/1:0/24:
 #0: ffff88813fe15948 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x841/0x15a0 kernel/workqueue.c:3254
 #1: ffffc900001e7b80 (free_ipc_work){+.+.}-{0:0}, at: process_one_work+0x868/0x15a0 kernel/workqueue.c:3255
 #2: ffffffff8e144e38 (rcu_state.exp_mutex){+.+.}-{4:4}, at: exp_funnel_lock kernel/rcu/tree_exp.h:343 [inline]
 #2: ffffffff8e144e38 (rcu_state.exp_mutex){+.+.}-{4:4}, at: synchronize_rcu_expedited+0x3b9/0x730 kernel/rcu/tree_exp.h:956
1 lock held by khungtaskd/31:
 #0: ffffffff8e13f2e0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
 #0: ffffffff8e13f2e0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:867 [inline]
 #0: ffffffff8e13f2e0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180 kernel/locking/lockdep.c:6775
4 locks held by kworker/1:1/44:
4 locks held by kworker/u8:13/4415:
2 locks held by getty/5589:
 #0: ffff88814d4cb0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
 #1: ffffc9000332b2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x449/0x1460 drivers/tty/n_tty.c:2211
3 locks held by syz-executor/10028:
 #0: ffff88806697cec0 (&hdev->req_lock){+.+.}-{4:4}, at: hci_dev_do_close net/bluetooth/hci_core.c:499 [inline]
 #0: ffff88806697cec0 (&hdev->req_lock){+.+.}-{4:4}, at: hci_unregister_dev+0x212/0x5b0 net/bluetooth/hci_core.c:2715
 #1: ffff88806697c0c0 (&hdev->lock){+.+.}-{4:4}, at: hci_dev_close_sync+0x640/0x1100 net/bluetooth/hci_sync.c:5329
 #2: ffffffff8f683f08 (hci_cb_list_lock){+.+.}-{4:4}, at: hci_disconn_cfm include/net/bluetooth/hci_core.h:2151 [inline]
 #2: ffffffff8f683f08 (hci_cb_list_lock){+.+.}-{4:4}, at: hci_conn_hash_flush+0xa1/0x260 net/bluetooth/hci_conn.c:2643
4 locks held by kworker/0:0/12910:
 #0: ffff8880630f1d48 ((wq_completion)xfs-sync/loop5){+.+.}-{0:0}, at: process_one_work+0x841/0x15a0 kernel/workqueue.c:3254
 #1: ffffc9000d25fb80 ((work_completion)(&mp->m_flush_inodes_work)){+.+.}-{0:0}, at: process_one_work+0x868/0x15a0 kernel/workqueue.c:3255
 #2: ffff88805da600e0 (&type->s_umount_key#55){++++}-{4:4}, at: xfs_flush_inodes_worker+0x45/0x80 fs/xfs/xfs_super.c:661
 #3: ffff888143378820 (&bdi->wb_switch_rwsem){+.+.}-{4:4}, at: bdi_down_write_wb_switch_rwsem fs/fs-writeback.c:397 [inline]
 #3: ffff888143378820 (&bdi->wb_switch_rwsem){+.+.}-{4:4}, at: sync_inodes_sb+0x1ad/0xb40 fs/fs-writeback.c:2892
2 locks held by syz-executor/14742:
 #0: ffff88807a17cec0 (&hdev->req_lock){+.+.}-{4:4}, at: hci_dev_do_close net/bluetooth/hci_core.c:499 [inline]
 #0: ffff88807a17cec0 (&hdev->req_lock){+.+.}-{4:4}, at: hci_unregister_dev+0x212/0x5b0 net/bluetooth/hci_core.c:2715
 #1: ffff88807a17c0c0 (&hdev->lock){+.+.}-{4:4}, at: hci_dev_close_sync+0x640/0x1100 net/bluetooth/hci_sync.c:5329
2 locks held by syz.5.1886/14908:
 #0: ffff88805da60420 (sb_writers#26){.+.+}-{0:0}, at: do_coredump fs/coredump.c:1126 [inline]
 #0: ffff88805da60420 (sb_writers#26){.+.+}-{0:0}, at: vfs_coredump+0x3321/0x3e60 fs/coredump.c:1200
 #1: ffff8880586a8ab0 (&sb->s_type->i_mutex_key#40){++++}-{4:4}, at: xfs_ilock+0xee/0x370 fs/xfs/xfs_inode.c:149
2 locks held by syz.8.1982/15289:
 #0: ffff88805da600e0 (&type->s_umount_key#55){++++}-{4:4}, at: __super_lock fs/super.c:59 [inline]
 #0: ffff88805da600e0 (&type->s_umount_key#55){++++}-{4:4}, at: super_lock+0x2a9/0x3b0 fs/super.c:121
 #1: ffff888143378820 (&bdi->wb_switch_rwsem){+.+.}-{4:4}, at: bdi_down_write_wb_switch_rwsem fs/fs-writeback.c:397 [inline]
 #1: ffff888143378820 (&bdi->wb_switch_rwsem){+.+.}-{4:4}, at: sync_inodes_sb+0x1ad/0xb40 fs/fs-writeback.c:2892
1 lock held by syz-executor/15469:
4 locks held by kworker/u9:2/15545:
 #0: ffff888075e9f148 ((wq_completion)hci8#2){+.+.}-{0:0}, at: process_one_work+0x841/0x15a0 kernel/workqueue.c:3254
 #1: ffffc90024ea7b80 ((work_completion)(&hdev->rx_work)){+.+.}-{0:0}, at: process_one_work+0x868/0x15a0 kernel/workqueue.c:3255
 #2: ffff888032de80c0 (&hdev->lock){+.+.}-{4:4}, at: hci_remote_features_evt+0x9b/0x920 net/bluetooth/hci_event.c:3720
 #3: ffffffff8f683f08 (hci_cb_list_lock){+.+.}-{4:4}, at: hci_connect_cfm include/net/bluetooth/hci_core.h:2136 [inline]
 #3: ffffffff8f683f08 (hci_cb_list_lock){+.+.}-{4:4}, at: hci_remote_features_evt+0x51c/0x920 net/bluetooth/hci_event.c:3754
5 locks held by syz-executor/15690:
 #0: ffff888052eccec0 (&hdev->req_lock){+.+.}-{4:4}, at: hci_dev_do_close net/bluetooth/hci_core.c:499 [inline]
 #0: ffff888052eccec0 (&hdev->req_lock){+.+.}-{4:4}, at: hci_unregister_dev+0x212/0x5b0 net/bluetooth/hci_core.c:2715
 #1: ffff888052ecc0c0 (&hdev->lock){+.+.}-{4:4}, at: hci_dev_close_sync+0x640/0x1100 net/bluetooth/hci_sync.c:5329
 #2: ffffffff8f683f08 (hci_cb_list_lock){+.+.}-{4:4}, at: hci_disconn_cfm include/net/bluetooth/hci_core.h:2151 [inline]
 #2: ffffffff8f683f08 (hci_cb_list_lock){+.+.}-{4:4}, at: hci_conn_hash_flush+0xa1/0x260 net/bluetooth/hci_conn.c:2643
 #3: ffff88807bbb4b38 (&conn->lock#2){+.+.}-{4:4}, at: l2cap_conn_del+0x7b/0x5b0 net/bluetooth/l2cap_core.c:1763
 #4: ffffffff8e144e38 (rcu_state.exp_mutex){+.+.}-{4:4}, at: exp_funnel_lock kernel/rcu/tree_exp.h:343 [inline]
 #4: ffffffff8e144e38 (rcu_state.exp_mutex){+.+.}-{4:4}, at: synchronize_rcu_expedited+0x3b9/0x730 kernel/rcu/tree_exp.h:956
1 lock held by syz.0.2263/16442:
3 locks held by syz-executor/16453:

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

NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 31 Comm: khungtaskd Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
Call Trace:
 <TASK>
 dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120
 nmi_cpu_backtrace+0x39e/0x3d0 lib/nmi_backtrace.c:113
 nmi_trigger_cpumask_backtrace+0x17a/0x300 lib/nmi_backtrace.c:62
 trigger_all_cpu_backtrace include/linux/nmi.h:160 [inline]
 __sys_info lib/sys_info.c:157 [inline]
 sys_info+0x135/0x170 lib/sys_info.c:165
 check_hung_uninterruptible_tasks kernel/hung_task.c:363 [inline]
 watchdog+0xe40/0xe90 kernel/hung_task.c:557
 kthread+0x711/0x8a0 kernel/kthread.c:463
 ret_from_fork+0x599/0xb30 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246
 </TASK>
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 4415 Comm: kworker/u8:13 Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
Workqueue: writeback wb_workfn (flush-7:5)
RIP: 0010:mac80211_hwsim_beacon_tx+0x10c/0x870 drivers/net/wireless/virtual/mac80211_hwsim.c:2332
Code: fa 78 ee fa 4e 8d 34 f3 4c 89 f0 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df 80 3c 08 00 74 08 4c 89 f7 e8 57 21 55 fb 49 8b 1e <e8> cf 78 8a 04 89 c5 31 ff 89 c6 e8 04 7d ee fa 85 ed 74 1b e8 5b
RSP: 0018:ffffc90000007b68 EFLAGS: 00000246
RAX: 1ffff1100fa95dee RBX: ffff88807d4aeaf8 RCX: dffffc0000000000
RDX: 0000000000000100 RSI: 0000000000000000 RDI: 0000000000000010
RBP: 0000000069537748 R08: ffff88807d4ad807 R09: 1ffff1100fa95b00
R10: dffffc0000000000 R11: ffffffff86d33e80 R12: 0000000000000000
R13: ffff88807d4aeaa0 R14: ffff88807d4aef70 R15: ffff8880322d0e80
FS:  0000000000000000(0000) GS:ffff888125c25000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffe64265e08 CR3: 0000000079de4000 CR4: 00000000003526f0
Call Trace:
 <IRQ>
 __iterate_interfaces+0x2ab/0x590 net/mac80211/util.c:761
 ieee80211_iterate_active_interfaces_atomic+0xdb/0x180 net/mac80211/util.c:797
 mac80211_hwsim_beacon+0xbb/0x180 drivers/net/wireless/virtual/mac80211_hwsim.c:2395
 __run_hrtimer kernel/time/hrtimer.c:1777 [inline]
 __hrtimer_run_queues+0x51c/0xc30 kernel/time/hrtimer.c:1841
 hrtimer_run_softirq+0x187/0x2b0 kernel/time/hrtimer.c:1858
 handle_softirqs+0x27d/0x850 kernel/softirq.c:626
 __do_softirq kernel/softirq.c:660 [inline]
 invoke_softirq kernel/softirq.c:496 [inline]
 __irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:727
 irq_exit_rcu+0x9/0x30 kernel/softirq.c:743
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1056 [inline]
 sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1056
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:console_trylock_spinning kernel/printk/printk.c:2037 [inline]
RIP: 0010:vprintk_emit+0x4d0/0x5f0 kernel/printk/printk.c:2425
Code: 0f 84 34 ff ff ff e8 4f 71 20 00 fb eb 44 e8 47 71 20 00 e8 f2 6a bc 09 4d 85 f6 74 94 e8 38 71 20 00 fb 48 c7 c7 e0 31 13 8e <31> f6 ba 01 00 00 00 31 c9 41 b8 01 00 00 00 45 31 c9 53 e8 28 26
RSP: 0018:ffffc9000d29dca0 EFLAGS: 00000293
RAX: ffffffff81a14728 RBX: ffffffff81a14581 RCX: ffff88803327db80
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff8e1331e0
RBP: ffffc9000d29ddb0 R08: ffffffff8fa22f77 R09: 1ffffffff1f445ee
R10: dffffc0000000000 R11: fffffbfff1f445ef R12: 0000000000000000
R13: 000000000000004b R14: 0000000000000200 R15: 1ffff92001a53b98
 _printk+0xcf/0x120 kernel/printk/printk.c:2451
 print_hex_dump+0x1a8/0x260 lib/hexdump.c:286
 xfs_hex_dump+0x3d/0x50 fs/xfs/xfs_message.c:110
 xfs_buf_verifier_error+0x1cc/0x2a0 fs/xfs/xfs_error.c:310
 xfs_allocbt_read_verify+0x5f/0xe0 fs/xfs/libxfs/xfs_alloc_btree.c:-1
 __xfs_buf_ioend+0x332/0x6d0 fs/xfs/xfs_buf.c:1174
 xfs_buf_iowait+0x143/0x440 fs/xfs/xfs_buf.c:1381
 _xfs_buf_read fs/xfs/xfs_buf.c:643 [inline]
 xfs_buf_read_map+0x325/0xa30 fs/xfs/xfs_buf.c:709
 xfs_trans_read_buf_map+0x1d7/0x8a0 fs/xfs/xfs_trans_buf.c:304
 xfs_trans_read_buf fs/xfs/xfs_trans.h:212 [inline]
 xfs_btree_read_buf_block+0x290/0x470 fs/xfs/libxfs/xfs_btree.c:1402
 xfs_btree_lookup_get_block+0x28d/0x500 fs/xfs/libxfs/xfs_btree.c:1907
 xfs_btree_lookup+0x4e1/0x1410 fs/xfs/libxfs/xfs_btree.c:2018
 xfs_alloc_lookup fs/xfs/libxfs/xfs_alloc.c:166 [inline]
 xfs_alloc_lookup_ge fs/xfs/libxfs/xfs_alloc.c:198 [inline]
 xfs_alloc_cur_setup fs/xfs/libxfs/xfs_alloc.c:966 [inline]
 xfs_alloc_ag_vextent_near+0x447/0x11d0 fs/xfs/libxfs/xfs_alloc.c:1705
 xfs_alloc_vextent_near_bno+0x2e7/0x560 fs/xfs/libxfs/xfs_alloc.c:3962
 xfs_bmap_btalloc_filestreams fs/xfs/libxfs/xfs_bmap.c:3566 [inline]
 xfs_bmap_btalloc fs/xfs/libxfs/xfs_bmap.c:3661 [inline]
 xfs_bmapi_allocate+0x1af7/0x2e00 fs/xfs/libxfs/xfs_bmap.c:3938
 xfs_bmapi_convert_one_delalloc fs/xfs/libxfs/xfs_bmap.c:4447 [inline]
 xfs_bmapi_convert_delalloc+0x7e2/0x1430 fs/xfs/libxfs/xfs_bmap.c:4503
 xfs_map_blocks fs/xfs/xfs_aops.c:445 [inline]
 xfs_writeback_range+0x674/0xf30 fs/xfs/xfs_aops.c:489
 iomap_writeback_range fs/iomap/buffered-io.c:1744 [inline]
 iomap_writeback_folio+0x1408/0x23f0 fs/iomap/buffered-io.c:1862
 iomap_writepages+0x162/0x2d0 fs/iomap/buffered-io.c:1922
 xfs_vm_writepages+0x296/0x310 fs/xfs/xfs_aops.c:701
 do_writepages+0x32e/0x550 mm/page-writeback.c:2598
 __writeback_single_inode+0x133/0x1240 fs/fs-writeback.c:1737
 writeback_sb_inodes+0x93a/0x1870 fs/fs-writeback.c:2030
 wb_writeback+0x42b/0xaa0 fs/fs-writeback.c:2216
 wb_do_writeback fs/fs-writeback.c:2363 [inline]
 wb_workfn+0x3f9/0xed0 fs/fs-writeback.c:2403
 process_one_work+0x93a/0x15a0 kernel/workqueue.c:3279
 process_scheduled_works kernel/workqueue.c:3362 [inline]
 worker_thread+0x9b0/0xee0 kernel/workqueue.c:3443
 kthread+0x711/0x8a0 kernel/kthread.c:463
 ret_from_fork+0x599/0xb30 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246
 </TASK>