INFO: task kworker/u4:7:2926 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/u4:7    state:D stack:22960 pid:2926  ppid:2      flags:0x00004000
Workqueue: writeback wb_workfn (flush-8:0)
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5393 [inline]
 __schedule+0x156f/0x4720 kernel/sched/core.c:6722
 schedule+0xbd/0x170 kernel/sched/core.c:6796
 io_schedule+0x80/0xd0 kernel/sched/core.c:9075
 bit_wait_io+0x13/0x100 kernel/sched/wait_bit.c:209
 __wait_on_bit+0x9f/0x2c0 kernel/sched/wait_bit.c:49
 out_of_line_wait_on_bit+0x13c/0x190 kernel/sched/wait_bit.c:64
 wait_on_bit_io include/linux/wait_bit.h:101 [inline]
 do_get_write_access+0x5c9/0xe00 fs/jbd2/transaction.c:1096
 jbd2_journal_get_write_access+0x10c/0x140 fs/jbd2/transaction.c:1231
 __ext4_journal_get_write_access+0x208/0x6d0 fs/ext4/ext4_jbd2.c:241
 ext4_mb_mark_diskspace_used+0x27c/0x14b0 fs/ext4/mballoc.c:4055
 ext4_mb_new_blocks+0x105b/0x42f0 fs/ext4/mballoc.c:6277
 ext4_ext_map_blocks+0x1811/0x68c0 fs/ext4/extents.c:4416
 ext4_map_blocks+0x9db/0x1a90 fs/ext4/inode.c:654
 mpage_map_one_extent fs/ext4/inode.c:2205 [inline]
 mpage_map_and_submit_extent fs/ext4/inode.c:2258 [inline]
 ext4_do_writepages+0x1463/0x3990 fs/ext4/inode.c:2733
 ext4_writepages+0x1dd/0x350 fs/ext4/inode.c:2822
 do_writepages+0x351/0x590 mm/page-writeback.c:2575
 __writeback_single_inode+0x14e/0xee0 fs/fs-writeback.c:1701
 writeback_sb_inodes+0x813/0x1020 fs/fs-writeback.c:1992
 __writeback_inodes_wb+0x114/0x240 fs/fs-writeback.c:2063
 wb_writeback+0x472/0xbe0 fs/fs-writeback.c:2173
 wb_check_old_data_flush fs/fs-writeback.c:2277 [inline]
 wb_do_writeback fs/fs-writeback.c:2330 [inline]
 wb_workfn+0xad7/0xe60 fs/fs-writeback.c:2358
 process_one_work kernel/workqueue.c:2657 [inline]
 process_scheduled_works+0xa60/0x1600 kernel/workqueue.c:2734
 worker_thread+0xa5e/0xfe0 kernel/workqueue.c:2815
 kthread+0x2fa/0x390 kernel/kthread.c:388
 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293
 </TASK>
INFO: task jbd2/sda1-8:5115 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:jbd2/sda1-8     state:D stack:25576 pid:5115  ppid:2      flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5393 [inline]
 __schedule+0x156f/0x4720 kernel/sched/core.c:6722
 schedule+0xbd/0x170 kernel/sched/core.c:6796
 io_schedule+0x80/0xd0 kernel/sched/core.c:9075
 bit_wait_io+0x13/0x100 kernel/sched/wait_bit.c:209
 __wait_on_bit+0x9f/0x2c0 kernel/sched/wait_bit.c:49
 out_of_line_wait_on_bit+0x13c/0x190 kernel/sched/wait_bit.c:64
 wait_on_buffer include/linux/buffer_head.h:373 [inline]
 jbd2_journal_commit_transaction+0x2e90/0x5ad0 fs/jbd2/commit.c:815
 kjournald2+0x40f/0x810 fs/jbd2/journal.c:201
 kthread+0x2fa/0x390 kernel/kthread.c:388
 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293
 </TASK>
INFO: task syz.0.115:6094 blocked for more than 144 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.0.115       state:D stack:27560 pid:6094  ppid:5924   flags:0x00004004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5393 [inline]
 __schedule+0x156f/0x4720 kernel/sched/core.c:6722
 schedule+0xbd/0x170 kernel/sched/core.c:6796
 io_schedule+0x80/0xd0 kernel/sched/core.c:9075
 bit_wait_io+0x13/0x100 kernel/sched/wait_bit.c:209
 __wait_on_bit+0x9f/0x2c0 kernel/sched/wait_bit.c:49
 out_of_line_wait_on_bit+0x13c/0x190 kernel/sched/wait_bit.c:64
 wait_on_bit_io include/linux/wait_bit.h:101 [inline]
 do_get_write_access+0x5c9/0xe00 fs/jbd2/transaction.c:1096
 jbd2_journal_get_write_access+0x10c/0x140 fs/jbd2/transaction.c:1231
 __ext4_journal_get_write_access+0x208/0x6d0 fs/ext4/ext4_jbd2.c:241
 ext4_reserve_inode_write+0x205/0x2a0 fs/ext4/inode.c:5967
 __ext4_mark_inode_dirty+0x13f/0x720 fs/ext4/inode.c:6151
 ext4_dirty_inode+0xcb/0x110 fs/ext4/inode.c:6188
 __mark_inode_dirty+0x2cc/0xc90 fs/fs-writeback.c:2537
 generic_update_time fs/inode.c:1978 [inline]
 inode_update_time fs/inode.c:1991 [inline]
 __file_update_time fs/inode.c:2177 [inline]
 file_update_time+0x187/0x1a0 fs/inode.c:2207
 ext4_page_mkwrite+0x1f9/0x11a0 fs/ext4/inode.c:6306
 do_page_mkwrite+0x153/0x3f0 mm/memory.c:2951
 do_shared_fault mm/memory.c:4717 [inline]
 do_fault mm/memory.c:4779 [inline]
 do_pte_missing mm/memory.c:3689 [inline]
 handle_pte_fault mm/memory.c:5047 [inline]
 __handle_mm_fault mm/memory.c:5190 [inline]
 handle_mm_fault+0x1a26/0x4a40 mm/memory.c:5355
 do_user_addr_fault+0xeb7/0x13e0 arch/x86/mm/fault.c:1371
 handle_page_fault arch/x86/mm/fault.c:1463 [inline]
 exc_page_fault+0x64/0x100 arch/x86/mm/fault.c:1516
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:608
RIP: 0033:0x7fe543c6ca63
RSP: 002b:00007ffc236c8460 EFLAGS: 00010246
RAX: 000000000003fde8 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000001b2ef24000 RSI: 0000000000040000 RDI: 00007fe543fe9708
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 00007ffc236c86f0
 </TASK>
INFO: task syz-executor:6107 blocked for more than 144 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor    state:D stack:25608 pid:6107  ppid:5798   flags:0x00004004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5393 [inline]
 __schedule+0x156f/0x4720 kernel/sched/core.c:6722
 schedule+0xbd/0x170 kernel/sched/core.c:6796
 io_schedule+0x80/0xd0 kernel/sched/core.c:9075
 bit_wait_io+0x13/0x100 kernel/sched/wait_bit.c:209
 __wait_on_bit+0x9f/0x2c0 kernel/sched/wait_bit.c:49
 out_of_line_wait_on_bit+0x13c/0x190 kernel/sched/wait_bit.c:64
 wait_on_bit_io include/linux/wait_bit.h:101 [inline]
 do_get_write_access+0x5c9/0xe00 fs/jbd2/transaction.c:1096
 jbd2_journal_get_write_access+0x10c/0x140 fs/jbd2/transaction.c:1231
 __ext4_journal_get_write_access+0x208/0x6d0 fs/ext4/ext4_jbd2.c:241
 __ext4_new_inode+0x140c/0x3aa0 fs/ext4/ialloc.c:1101
 ext4_mkdir+0x40b/0xc90 fs/ext4/namei.c:3068
 vfs_mkdir+0x2a5/0x470 fs/namei.c:4180
 do_mkdirat+0x1dc/0x450 fs/namei.c:4203
 __do_sys_mkdir fs/namei.c:4223 [inline]
 __se_sys_mkdir fs/namei.c:4221 [inline]
 __x64_sys_mkdir+0x6e/0x80 fs/namei.c:4221
 do_syscall_x64 arch/x86/entry/common.c:46 [inline]
 do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f53883d9527
RSP: 002b:00007ffe1666ee08 EFLAGS: 00000246 ORIG_RAX: 0000000000000053
RAX: ffffffffffffffda RBX: 00007ffe1666ef32 RCX: 00007f53883d9527
RDX: 0000000002fba340 RSI: 00000000000001c0 RDI: 00007ffe1666ef20
RBP: 8421084210842109 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000002fba340
R13: 00007ffe1666ef32 R14: 0000000000000004 R15: 00007f538845ea60
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/29:
 #0: ffffffff8e1322e0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:334 [inline]
 #0: ffffffff8e1322e0 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:786 [inline]
 #0: ffffffff8e1322e0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x55/0x290 kernel/locking/lockdep.c:6669
4 locks held by kworker/u4:3/50:
 #0: ffff8880b8d3c258 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x29/0x130 kernel/sched/core.c:570
 #1: ffff8880b8d28a00 (psi_seq){-.-.}-{0:0}, at: psi_sched_switch kernel/sched/stats.h:189 [inline]
 #1: ffff8880b8d28a00 (psi_seq){-.-.}-{0:0}, at: __schedule+0x21fc/0x4720 kernel/sched/core.c:6717
 #2: ffff88802da80768 (&rdev->wiphy.mtx){+.+.}-{3:3}, at: wiphy_lock include/net/cfg80211.h:5878 [inline]
 #2: ffff88802da80768 (&rdev->wiphy.mtx){+.+.}-{3:3}, at: cfg80211_wiphy_work+0x35/0x260 net/wireless/core.c:431
 #3: ffff88806d8b0e00 (&wdev->mtx){+.+.}-{3:3}, at: sdata_lock net/mac80211/ieee80211_i.h:1140 [inline]
 #3: ffff88806d8b0e00 (&wdev->mtx){+.+.}-{3:3}, at: ieee80211_ibss_work+0xac/0x1100 net/mac80211/ibss.c:1683
7 locks held by kworker/u4:7/2926:
 #0: ffff88814005c138 ((wq_completion)writeback){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:2632 [inline]
 #0: ffff88814005c138 ((wq_completion)writeback){+.+.}-{0:0}, at: process_scheduled_works+0x975/0x1600 kernel/workqueue.c:2734
 #1: ffffc9000bb67d00 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:2632 [inline]
 #1: ffffc9000bb67d00 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_scheduled_works+0x975/0x1600 kernel/workqueue.c:2734
 #2: ffff88814ce900e0 (&type->s_umount_key#32){++++}-{3:3}, at: super_trylock_shared+0x20/0xf0 fs/super.c:604
 #3: ffff88814ce92c58 (&sbi->s_writepages_rwsem){++++}-{0:0}, at: ext4_writepages_down_read fs/ext4/ext4.h:1770 [inline]
 #3: ffff88814ce92c58 (&sbi->s_writepages_rwsem){++++}-{0:0}, at: ext4_writepages+0x1a4/0x350 fs/ext4/inode.c:2821
 #4: ffff88814ce44990 (jbd2_handle){++++}-{0:0}, at: start_this_handle+0x1f3f/0x2170 fs/jbd2/transaction.c:448
 #5: ffff888077749688 (&ei->i_data_sem){++++}-{3:3}, at: ext4_map_blocks+0x918/0x1a90 fs/ext4/inode.c:647
 #6: ffffe8ffffd1fa68 (&lg->lg_mutex){+.+.}-{3:3}, at: ext4_mb_group_or_file fs/ext4/mballoc.c:5827 [inline]
 #6: ffffe8ffffd1fa68 (&lg->lg_mutex){+.+.}-{3:3}, at: ext4_mb_initialize_context+0x8af/0xc80 fs/ext4/mballoc.c:5871
5 locks held by kworker/u4:9/3464:
2 locks held by getty/5545:
 #0: ffff88802f1170a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
 #1: ffffc9000327e2f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x43a/0x1400 drivers/tty/n_tty.c:2217
3 locks held by syz.0.115/6094:
 #0: ffff888030d4e0a0 (&mm->mmap_lock){++++}-{3:3}, at: mmap_read_trylock include/linux/mmap_lock.h:165 [inline]
 #0: ffff888030d4e0a0 (&mm->mmap_lock){++++}-{3:3}, at: get_mmap_lock_carefully mm/memory.c:5382 [inline]
 #0: ffff888030d4e0a0 (&mm->mmap_lock){++++}-{3:3}, at: lock_mm_and_find_vma+0x32/0x2f0 mm/memory.c:5442
 #1: ffff88814ce90510 (sb_pagefaults){.+.+}-{0:0}, at: __sb_start_write include/linux/fs.h:1634 [inline]
 #1: ffff88814ce90510 (sb_pagefaults){.+.+}-{0:0}, at: sb_start_pagefault include/linux/fs.h:1738 [inline]
 #1: ffff88814ce90510 (sb_pagefaults){.+.+}-{0:0}, at: ext4_page_mkwrite+0x1e2/0x11a0 fs/ext4/inode.c:6305
 #2: ffff88814ce44990 (jbd2_handle){++++}-{0:0}, at: start_this_handle+0x1f3f/0x2170 fs/jbd2/transaction.c:448
3 locks held by syz-executor/6107:
 #0: ffff88814ce90418 (sb_writers#4){.+.+}-{0:0}, at: mnt_want_write+0x41/0x90 fs/namespace.c:412
 #1: ffff888077717210 (&type->i_mutex_dir_key#3/1){+.+.}-{3:3}, at: inode_lock_nested include/linux/fs.h:839 [inline]
 #1: ffff888077717210 (&type->i_mutex_dir_key#3/1){+.+.}-{3:3}, at: filename_create+0x20f/0x450 fs/namei.c:3949
 #2: ffff88814ce44990 (jbd2_handle){++++}-{0:0}, at: start_this_handle+0x1f3f/0x2170 fs/jbd2/transaction.c:448

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

NMI backtrace for cpu 0
CPU: 0 PID: 29 Comm: khungtaskd Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/06/2026
Call Trace:
 <TASK>
 dump_stack_lvl+0x18c/0x250 lib/dump_stack.c:106
 nmi_cpu_backtrace+0x3a6/0x3e0 lib/nmi_backtrace.c:113
 nmi_trigger_cpumask_backtrace+0x17a/0x2f0 lib/nmi_backtrace.c:62
 trigger_all_cpu_backtrace include/linux/nmi.h:160 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:222 [inline]
 watchdog+0xf59/0xfa0 kernel/hung_task.c:379
 kthread+0x2fa/0x390 kernel/kthread.c:388
 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293
 </TASK>
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 5904 Comm: kworker/1:4 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/06/2026
Workqueue: wg-crypt-wg0 wg_packet_encrypt_worker
RIP: 0010:check_prev_add kernel/locking/lockdep.c:-1 [inline]
RIP: 0010:check_prevs_add kernel/locking/lockdep.c:3281 [inline]
RIP: 0010:validate_chain kernel/locking/lockdep.c:3897 [inline]
RIP: 0010:__lock_acquire+0x52bb/0x7eb0 kernel/locking/lockdep.c:5171
Code: bf ff ff 4c 8d 73 10 4c 89 f0 48 c1 e8 03 42 80 3c 00 00 74 12 4c 89 f7 e8 a2 b1 77 00 49 b8 00 00 00 00 00 fc ff df 4d 8b 36 <48> 8b 44 24 68 42 0f b6 04 00 84 c0 0f 85 4f 01 00 00 48 8b 44 24
RSP: 0018:ffffc90003326640 EFLAGS: 00000046
RAX: 1ffffffff29789c1 RBX: ffffffff94bc4df8 RCX: ffffffff81693538
RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffffffff92223508
RBP: ffffc90003326888 R08: dffffc0000000000 R09: 1ffffffff24446a1
R10: dffffc0000000000 R11: fffffbfff24446a2 R12: 0000000000000000
R13: 0000000000000144 R14: ffffffff91be8e00 R15: ffff88807dfb2980
FS:  0000000000000000(0000) GS:ffff8880b8d00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000056115f8c4660 CR3: 000000000df32000 CR4: 00000000003506e0
Call Trace:
 <TASK>
 lock_acquire+0x19e/0x420 kernel/locking/lockdep.c:5790
 __raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline]
 _raw_spin_lock+0x2e/0x40 kernel/locking/spinlock.c:154
 rcu_note_context_switch+0x27c/0x10f0 kernel/rcu/tree_plugin.h:326
 __schedule+0x322/0x4720 kernel/sched/core.c:6619
 preempt_schedule_irq+0xbf/0x150 kernel/sched/core.c:7032
 irqentry_exit+0x67/0x70 kernel/entry/common.c:441
 asm_sysvec_reschedule_ipi+0x1a/0x20 arch/x86/include/asm/idtentry.h:692
RIP: 0010:__skb_flow_dissect+0x4f0/0x6d10 net/core/flow_dissector.c:1115
Code: 0f 94 c1 84 c1 75 76 e8 9e 24 01 f9 4d 85 e4 0f 84 cd 67 00 00 4c 89 74 24 48 48 c7 c0 c0 37 6f 98 48 c1 e8 03 42 80 3c 38 00 <74> 0c 48 c7 c7 c0 37 6f 98 e8 22 2d 5a f9 48 8b 1d 8b 7d e8 0f e8
RSP: 0018:ffffc90003326f00 EFLAGS: 00000246
RAX: 1ffffffff30de6f8 RBX: 0000000000000001 RCX: ffff88807dfb1e00
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc90003327518 R08: dffffc0000000000 R09: 1ffffffff24446a0
R10: dffffc0000000000 R11: fffffbfff24446a1 R12: ffff8880799d3c00
R13: 1ffffffff1f1c98a R14: ffffffff8f8e4c52 R15: dffffc0000000000
 __skb_get_hash_net+0xe7/0x2e0 net/core/flow_dissector.c:1881
 skb_get_hash include/linux/skbuff.h:1594 [inline]
 encrypt_packet drivers/net/wireguard/send.c:173 [inline]
 wg_packet_encrypt_worker+0x3d0/0x15b0 drivers/net/wireguard/send.c:297
 process_one_work kernel/workqueue.c:2657 [inline]
 process_scheduled_works+0xa60/0x1600 kernel/workqueue.c:2734
 worker_thread+0xa5e/0xfe0 kernel/workqueue.c:2815
 kthread+0x2fa/0x390 kernel/kthread.c:388
 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293
 </TASK>