INFO: task jbd2/sda1-8:4965 blocked in I/O wait for more than 143 seconds.
      Tainted: G             L      syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:jbd2/sda1-8     state:D stack
task:jbd2/sda1-8     state:D stack:25080 pid:4965  tgid:4965  ppid:2      task_flags:0x240040 flags:0x00080000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5583 [inline]
 __schedule+0x17dd/0x5830 kernel/sched/core.c:7382
 __schedule_loop kernel/sched/core.c:7459 [inline]
 schedule+0x164/0x2b0 kernel/sched/core.c:7474
 io_schedule+0x7f/0xd0 kernel/sched/core.c:8146
 bit_wait_io+0x13/0x110 kernel/sched/wait_bit.c:258
 __wait_on_bit+0xac/0x300 kernel/sched/wait_bit.c:52
 out_of_line_wait_on_bit+0x13b/0x190 kernel/sched/wait_bit.c:67
 wait_on_buffer include/linux/buffer_head.h:476 [inline]
 jbd2_journal_commit_transaction+0x2f6e/0x5c80 fs/jbd2/commit.c:834
 kjournald2+0x3bc/0x740 fs/jbd2/journal.c:200
 kthread+0x38b/0x480 kernel/kthread.c:436
 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
INFO: task syz-executor:5624 blocked in I/O wait for more than 143 seconds.
      Tainted: G             L      syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor    state:D stack:22472 pid:5624  tgid:5624  ppid:5623   task_flags:0x440100 flags:0x00080000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5583 [inline]
 __schedule+0x17dd/0x5830 kernel/sched/core.c:7382
 __schedule_loop kernel/sched/core.c:7459 [inline]
 schedule+0x164/0x2b0 kernel/sched/core.c:7474
 io_schedule+0x7f/0xd0 kernel/sched/core.c:8146
 bit_wait_io+0x13/0x110 kernel/sched/wait_bit.c:258
 __wait_on_bit+0xac/0x300 kernel/sched/wait_bit.c:52
 out_of_line_wait_on_bit+0x13b/0x190 kernel/sched/wait_bit.c:67
 wait_on_bit_io include/linux/wait_bit.h:106 [inline]
 do_get_write_access+0x658/0x10c0 fs/jbd2/transaction.c:1113
 jbd2_journal_get_write_access+0x1d7/0x230 fs/jbd2/transaction.c:1263
 __ext4_journal_get_write_access+0xec/0x620 fs/ext4/ext4_jbd2.c:253
 ext4_reserve_inode_write+0x294/0x360 fs/ext4/inode.c:7451
 __ext4_mark_inode_dirty+0x141/0x7e0 fs/ext4/inode.c:7642
 ext4_dirty_inode+0xd0/0x110 fs/ext4/inode.c:7679
 __mark_inode_dirty+0x3a8/0x13b0 fs/fs-writeback.c:2751
 generic_update_time fs/inode.c:2264 [inline]
 file_update_time_flags+0x399/0x440 fs/inode.c:2494
 ext4_page_mkwrite+0x21f/0x1470 fs/ext4/inode.c:7864
 do_page_mkwrite+0x147/0x310 mm/memory.c:3856
 wp_page_shared mm/memory.c:4262 [inline]
 do_wp_page+0x1a77/0x4c30 mm/memory.c:4485
 handle_pte_fault mm/memory.c:6659 [inline]
 __handle_mm_fault mm/memory.c:6784 [inline]
 handle_mm_fault+0x19c9/0x2f80 mm/memory.c:6951
 do_user_addr_fault+0xb35/0x1480 arch/x86/mm/fault.c:1343
 handle_page_fault arch/x86/mm/fault.c:1483 [inline]
 exc_page_fault+0x6a/0xc0 arch/x86/mm/fault.c:1536
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:595
RIP: 0033:0x00007f969187df91
RSP: 002b:00007ffc70abef80 EFLAGS: 00010202
RAX: 0000000000000004 RBX: 0000000000000001 RCX: 0000000000000002
RDX: 00007f968f8d4000 RSI: 0000000000000784 RDI: ffffffff8a8fffff
RBP: 00007ffc70abf480 R08: 0000000000001000 R09: 0000555560b18568
R10: 00000000000000a5 R11: 0000555560b18580 R12: 00007ffc70abf2c0
R13: 00007ffc70abf0b0 R14: 585858582e7a7973 R15: 00007ffc70abf000
 </TASK>
INFO: task syz.9.1301:13914 blocked in I/O wait for more than 143 seconds.
      Tainted: G             L      syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.9.1301      state:D stack:24680 pid:13914 tgid:13914 ppid:8468   task_flags:0x440040 flags:0x00080002
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5583 [inline]
 __schedule+0x17dd/0x5830 kernel/sched/core.c:7382
 __schedule_loop kernel/sched/core.c:7459 [inline]
 schedule+0x164/0x2b0 kernel/sched/core.c:7474
 io_schedule+0x7f/0xd0 kernel/sched/core.c:8146
 bit_wait_io+0x13/0x110 kernel/sched/wait_bit.c:258
 __wait_on_bit+0xac/0x300 kernel/sched/wait_bit.c:52
 out_of_line_wait_on_bit+0x13b/0x190 kernel/sched/wait_bit.c:67
 wait_on_bit_io include/linux/wait_bit.h:106 [inline]
 do_get_write_access+0x658/0x10c0 fs/jbd2/transaction.c:1113
 jbd2_journal_get_write_access+0x1d7/0x230 fs/jbd2/transaction.c:1263
 __ext4_journal_get_write_access+0xec/0x620 fs/ext4/ext4_jbd2.c:253
 ext4_reserve_inode_write+0x294/0x360 fs/ext4/inode.c:7451
 __ext4_mark_inode_dirty+0x141/0x7e0 fs/ext4/inode.c:7642
 ext4_dirty_inode+0xd0/0x110 fs/ext4/inode.c:7679
 __mark_inode_dirty+0x3a8/0x13b0 fs/fs-writeback.c:2751
 generic_update_time fs/inode.c:2264 [inline]
 file_update_time_flags+0x399/0x440 fs/inode.c:2494
 ext4_page_mkwrite+0x21f/0x1470 fs/ext4/inode.c:7864
 do_page_mkwrite+0x147/0x310 mm/memory.c:3856
 do_shared_fault mm/memory.c:6155 [inline]
 do_fault mm/memory.c:6217 [inline]
 do_pte_missing+0x70f/0x3570 mm/memory.c:4745
 handle_pte_fault mm/memory.c:6632 [inline]
 __handle_mm_fault mm/memory.c:6784 [inline]
 handle_mm_fault+0x1807/0x2f80 mm/memory.c:6951
 do_user_addr_fault+0xb35/0x1480 arch/x86/mm/fault.c:1343
 handle_page_fault arch/x86/mm/fault.c:1483 [inline]
 exc_page_fault+0x6a/0xc0 arch/x86/mm/fault.c:1536
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:595
RIP: 0033:0x00007fb9b5674812
RSP: 002b:00007ffe3ed90eb0 EFLAGS: 00010202
RAX: 000000000000e008 RBX: 00007fb9b6555720 RCX: 0000000000000000
RDX: 0000001b34d16000 RSI: 0000000000000008 RDI: 00007fb9b6555720
RBP: 0000000000000316 R08: 00007fb9b5a10000 R09: 00007fb9b5a26128
R10: 0000000000000003 R11: ffffffff816fffff R12: ffffffff81eee773
R13: 00007fb9b5a26128 R14: 00000000000001bf R15: ffffffffffff2000
 </TASK>
INFO: task syz.0.1303:13920 blocked in I/O wait for more than 143 seconds.
      Tainted: G             L      syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.0.1303      state:D stack:28072 pid:13920 tgid:13920 ppid:11939  task_flags:0x440040 flags:0x00080002
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5583 [inline]
 __schedule+0x17dd/0x5830 kernel/sched/core.c:7382
 __schedule_loop kernel/sched/core.c:7459 [inline]
 schedule+0x164/0x2b0 kernel/sched/core.c:7474
 io_schedule+0x7f/0xd0 kernel/sched/core.c:8146
 bit_wait_io+0x13/0x110 kernel/sched/wait_bit.c:258
 __wait_on_bit+0xac/0x300 kernel/sched/wait_bit.c:52
 out_of_line_wait_on_bit+0x13b/0x190 kernel/sched/wait_bit.c:67
 wait_on_bit_io include/linux/wait_bit.h:106 [inline]
 do_get_write_access+0x658/0x10c0 fs/jbd2/transaction.c:1113
 jbd2_journal_get_write_access+0x1d7/0x230 fs/jbd2/transaction.c:1263
 __ext4_journal_get_write_access+0xec/0x620 fs/ext4/ext4_jbd2.c:253
 ext4_reserve_inode_write+0x294/0x360 fs/ext4/inode.c:7451
 __ext4_mark_inode_dirty+0x141/0x7e0 fs/ext4/inode.c:7642
 ext4_dirty_inode+0xd0/0x110 fs/ext4/inode.c:7679
 __mark_inode_dirty+0x3a8/0x13b0 fs/fs-writeback.c:2751
 generic_update_time fs/inode.c:2264 [inline]
 file_update_time_flags+0x399/0x440 fs/inode.c:2494
 ext4_page_mkwrite+0x21f/0x1470 fs/ext4/inode.c:7864
 do_page_mkwrite+0x147/0x310 mm/memory.c:3856
 do_shared_fault mm/memory.c:6155 [inline]
 do_fault mm/memory.c:6217 [inline]
 do_pte_missing+0x70f/0x3570 mm/memory.c:4745
 handle_pte_fault mm/memory.c:6632 [inline]
 __handle_mm_fault mm/memory.c:6784 [inline]
 handle_mm_fault+0x1807/0x2f80 mm/memory.c:6951
 do_user_addr_fault+0xb35/0x1480 arch/x86/mm/fault.c:1343
 handle_page_fault arch/x86/mm/fault.c:1483 [inline]
 exc_page_fault+0x6a/0xc0 arch/x86/mm/fault.c:1536
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:595
RIP: 0033:0x00007f1f50a6c7c3
RSP: 002b:00007fffbaa1da10 EFLAGS: 00010246
RAX: 000000000003fde8 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000001b2e424000 RSI: 0000000000040000 RDI: 00007f1f50de8708
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 00007fffbaa1dca0
 </TASK>

Showing all locks held in the system:
locks held by khungtaskd/35: 1, last CPU#1:
 #0: ffffffff9015a560 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:309 [inline]
 #0: ffffffff9015a560 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
 #0: ffffffff9015a560 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180 kernel/locking/lockdep.c:6871
locks held by syz-executor/5624: 3, on CPU#0:
 #0: ffff888028874bc8 (vm_lock){++++}-{0:0}, at: lock_vma_under_rcu+0x1d1/0x500 mm/mmap_lock.c:339
 #1: ffff8880378e8570 (sb_pagefaults){.+.+}-{0:0}, at: sb_start_pagefault include/linux/fs/super.h:159 [inline]
 #1: ffff8880378e8570 (sb_pagefaults){.+.+}-{0:0}, at: ext4_page_mkwrite+0x1fe/0x1470 fs/ext4/inode.c:7863
 #2: ffff8880378f6950 (jbd2_handle){++++}-{0:0}, at: start_this_handle+0x1fb0/0x21f0 fs/jbd2/transaction.c:444
locks held by syz.9.1301/13914: 3, on CPU#1:
 #0: ffff888093b79d08 (vm_lock){++++}-{0:0}, at: lock_vma_under_rcu+0x1d1/0x500 mm/mmap_lock.c:339
 #1: ffff8880378e8570 (sb_pagefaults){.+.+}-{0:0}, at: sb_start_pagefault include/linux/fs/super.h:159 [inline]
 #1: ffff8880378e8570 (sb_pagefaults){.+.+}-{0:0}, at: ext4_page_mkwrite+0x1fe/0x1470 fs/ext4/inode.c:7863
 #2: ffff8880378f6950 (jbd2_handle){++++}-{0:0}, at: start_this_handle+0x1fb0/0x21f0 fs/jbd2/transaction.c:444
locks held by syz.0.1303/13920: 3, on CPU#0:
 #0: ffff888075ef4a88 (vm_lock){++++}-{0:0}, at: lock_vma_under_rcu+0x1d1/0x500 mm/mmap_lock.c:339
 #1: ffff8880378e8570 (sb_pagefaults){.+.+}-{0:0}, at: sb_start_pagefault include/linux/fs/super.h:159 [inline]
 #1: ffff8880378e8570 (sb_pagefaults){.+.+}-{0:0}, at: ext4_page_mkwrite+0x1fe/0x1470 fs/ext4/inode.c:7863
 #2: ffff8880378f6950 (jbd2_handle){++++}-{0:0}, at: start_this_handle+0x1fb0/0x21f0 fs/jbd2/transaction.c:444

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

NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 35 Comm: khungtaskd Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/15/2026
Call Trace:
 <TASK>
 dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
 nmi_cpu_backtrace+0x274/0x2d0 lib/nmi_backtrace.c:123
 nmi_trigger_cpumask_backtrace+0x17d/0x390 lib/nmi_backtrace.c:66
 trigger_all_cpu_backtrace include/linux/nmi.h:164 [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:377 [inline]
 watchdog+0x1073/0x10f0 kernel/hung_task.c:598
 kthread+0x38b/0x480 kernel/kthread.c:436
 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 409 Comm: kworker/u8:7 Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/15/2026
Workqueue: events_unbound cfg80211_wiphy_work
RIP: 0010:ieee80211_sta_get_rates+0x3a2/0x5d0 net/mac80211/util.c:1643
Code: 8b 54 24 10 48 89 d0 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df 0f b6 04 08 84 c0 75 72 09 1a 44 39 74 24 58 0f 84 aa 00 00 00 <e8> 19 28 41 f6 49 ff c6 e9 18 ff ff ff 89 d9 80 e1 07 fe c1 38 c1
RSP: 0018:ffffc900030a7668 EFLAGS: 00000206
RAX: ffffffff8b880bc6 RBX: 0000000000000078 RCX: ffff888027275dc0
RDX: 0000000000000000 RSI: 0000000000000078 RDI: 0000000000000014
RBP: 0000000000000014 R08: 0000000000000000 R09: 000000000000000c
R10: 000000000000000c R11: 0000000000000000 R12: 1ffff11015470666
R13: ffff888053e10001 R14: 0000000000000006 R15: ffff8880aa383330
FS:  0000000000000000(0000) GS:ffff8881233f0000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f4042deee9c CR3: 000000000ff48000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 ieee80211_update_sta_info net/mac80211/ibss.c:953 [inline]
 ieee80211_rx_bss_info net/mac80211/ibss.c:1063 [inline]
 ieee80211_rx_mgmt_probe_beacon net/mac80211/ibss.c:1546 [inline]
 ieee80211_ibss_rx_queued_mgmt+0x1165/0x2c40 net/mac80211/ibss.c:1573
 ieee80211_iface_process_skb net/mac80211/iface.c:1799 [inline]
 ieee80211_iface_work+0x769/0xfa0 net/mac80211/iface.c:1853
 cfg80211_wiphy_work+0x29e/0x420 net/wireless/core.c:610
 process_one_work kernel/workqueue.c:3505 [inline]
 process_scheduled_works+0xc3d/0x1630 kernel/workqueue.c:3588
 worker_thread+0xa47/0xfb0 kernel/workqueue.c:3669
 kthread+0x38b/0x480 kernel/kthread.c:436
 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>