INFO: task kworker/u4:2:41 blocked for more than 143 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/u4:2 state:D stack:23184 pid:41 ppid:2 flags:0x00004000
Workqueue: writeback wb_workfn (flush-8:0)
Call Trace:
context_switch kernel/sched/core.c:5257 [inline]
__schedule+0x1089/0x4140 kernel/sched/core.c:6584
schedule+0xb9/0x180 kernel/sched/core.c:6660
io_schedule+0x7c/0xd0 kernel/sched/core.c:8848
rq_qos_wait+0x227/0x350 block/blk-rq-qos.c:282
__wbt_wait block/blk-wbt.c:522 [inline]
wbt_wait+0x384/0x650 block/blk-wbt.c:586
__rq_qos_throttle+0x61/0xa0 block/blk-rq-qos.c:66
rq_qos_throttle block/blk-rq-qos.h:197 [inline]
blk_mq_get_new_requests block/blk-mq.c:2924 [inline]
blk_mq_submit_bio+0xa27/0x1ee0 block/blk-mq.c:3017
__submit_bio+0x1a2/0x290 block/blk-core.c:592
__submit_bio_noacct_mq block/blk-core.c:669 [inline]
submit_bio_noacct_nocheck+0x79b/0xaa0 block/blk-core.c:698
ext4_io_submit+0xd8/0x140 fs/ext4/page-io.c:378
ext4_writepages+0xb90/0x2fe0 fs/ext4/inode.c:2817
do_writepages+0x3c6/0x640 mm/page-writeback.c:2491
__writeback_single_inode+0x153/0x1170 fs/fs-writeback.c:1688
writeback_sb_inodes+0xad5/0x17f0 fs/fs-writeback.c:1979
__writeback_inodes_wb+0x12a/0x3f0 fs/fs-writeback.c:2050
wb_writeback+0x484/0xd40 fs/fs-writeback.c:2155
wb_check_old_data_flush fs/fs-writeback.c:2255 [inline]
wb_do_writeback fs/fs-writeback.c:2308 [inline]
wb_workfn+0xb68/0xee0 fs/fs-writeback.c:2336
process_one_work+0x8ab/0x1160 kernel/workqueue.c:2292
worker_thread+0xaf5/0x12a0 kernel/workqueue.c:2439
kthread+0x29d/0x330 kernel/kthread.c:376
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
INFO: task jbd2/sda1-8:3604 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:25872 pid:3604 ppid:2 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:5257 [inline]
__schedule+0x1089/0x4140 kernel/sched/core.c:6584
schedule+0xb9/0x180 kernel/sched/core.c:6660
io_schedule+0x7c/0xd0 kernel/sched/core.c:8848
bit_wait_io+0xf/0x100 kernel/sched/wait_bit.c:209
__wait_on_bit+0x9b/0x2c0 kernel/sched/wait_bit.c:49
out_of_line_wait_on_bit+0x138/0x190 kernel/sched/wait_bit.c:64
wait_on_buffer include/linux/buffer_head.h:385 [inline]
jbd2_journal_commit_transaction+0x2f0f/0x5f30 fs/jbd2/commit.c:849
kjournald2+0x40b/0x800 fs/jbd2/journal.c:210
kthread+0x29d/0x330 kernel/kthread.c:376
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
INFO: task syz-executor:4263 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:22992 pid:4263 ppid:4262 flags:0x00004002
Call Trace:
context_switch kernel/sched/core.c:5257 [inline]
__schedule+0x1089/0x4140 kernel/sched/core.c:6584
schedule+0xb9/0x180 kernel/sched/core.c:6660
io_schedule+0x7c/0xd0 kernel/sched/core.c:8848
bit_wait_io+0xf/0x100 kernel/sched/wait_bit.c:209
__wait_on_bit+0x9b/0x2c0 kernel/sched/wait_bit.c:49
out_of_line_wait_on_bit+0x138/0x190 kernel/sched/wait_bit.c:64
wait_on_bit_io include/linux/wait_bit.h:101 [inline]
do_get_write_access+0x605/0xf20 fs/jbd2/transaction.c:1115
jbd2_journal_get_write_access+0x108/0x140 fs/jbd2/transaction.c:1250
__ext4_journal_get_write_access+0x24b/0x6e0 fs/ext4/ext4_jbd2.c:235
ext4_reserve_inode_write+0x201/0x290 fs/ext4/inode.c:5978
__ext4_mark_inode_dirty+0x161/0x7b0 fs/ext4/inode.c:6162
ext4_dirty_inode+0xbf/0x100 fs/ext4/inode.c:6199
__mark_inode_dirty+0x2e7/0xe80 fs/fs-writeback.c:2515
generic_update_time fs/inode.c:1944 [inline]
inode_update_time fs/inode.c:1957 [inline]
__file_update_time+0x21d/0x240 fs/inode.c:2145
file_update_time+0x2f3/0x370 fs/inode.c:2176
ext4_page_mkwrite+0x1a9/0x10d0 fs/ext4/inode.c:6317
do_page_mkwrite+0x16b/0x5c0 mm/memory.c:3009
wp_page_shared+0x167/0x370 mm/memory.c:3358
handle_pte_fault mm/memory.c:5047 [inline]
__handle_mm_fault mm/memory.c:5171 [inline]
handle_mm_fault+0x1b1b/0x3d40 mm/memory.c:5292
do_user_addr_fault+0x5a9/0xbb0 arch/x86/mm/fault.c:1338
handle_page_fault arch/x86/mm/fault.c:1429 [inline]
exc_page_fault+0x60/0x100 arch/x86/mm/fault.c:1482
asm_exc_page_fault+0x22/0x30 arch/x86/include/asm/idtentry.h:608
RIP: 0033:0x7f9df696e687
RSP: 002b:00007ffebb8f25c8 EFLAGS: 00010202
RAX: 00007f9dee800000 RBX: 0000555574541210 RCX: 000000000000d0b3
RDX: 00000000000100b3 RSI: 00005555745b0330 RDI: 00007f9dee803000
RBP: 00007ffebb8f25e0 R08: 00007f9dee800000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000202 R12: 000055557453e1c0
R13: 0000000000000008 R14: 0000000000000001 R15: 0000000000000000
INFO: task syz.1.417:5532 blocked for more than 144 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.1.417 state:D stack:27600 pid:5532 ppid:4276 flags:0x00004004
Call Trace:
context_switch kernel/sched/core.c:5257 [inline]
__schedule+0x1089/0x4140 kernel/sched/core.c:6584
schedule+0xb9/0x180 kernel/sched/core.c:6660
io_schedule+0x7c/0xd0 kernel/sched/core.c:8848
bit_wait_io+0xf/0x100 kernel/sched/wait_bit.c:209
__wait_on_bit+0x9b/0x2c0 kernel/sched/wait_bit.c:49
out_of_line_wait_on_bit+0x138/0x190 kernel/sched/wait_bit.c:64
wait_on_bit_io include/linux/wait_bit.h:101 [inline]
do_get_write_access+0x605/0xf20 fs/jbd2/transaction.c:1115
jbd2_journal_get_write_access+0x108/0x140 fs/jbd2/transaction.c:1250
__ext4_journal_get_write_access+0x24b/0x6e0 fs/ext4/ext4_jbd2.c:235
ext4_reserve_inode_write+0x201/0x290 fs/ext4/inode.c:5978
__ext4_mark_inode_dirty+0x161/0x7b0 fs/ext4/inode.c:6162
ext4_dirty_inode+0xbf/0x100 fs/ext4/inode.c:6199
__mark_inode_dirty+0x2e7/0xe80 fs/fs-writeback.c:2515
generic_update_time fs/inode.c:1944 [inline]
inode_update_time fs/inode.c:1957 [inline]
__file_update_time+0x21d/0x240 fs/inode.c:2145
file_update_time+0x2f3/0x370 fs/inode.c:2176
ext4_page_mkwrite+0x1a9/0x10d0 fs/ext4/inode.c:6317
do_page_mkwrite+0x16b/0x5c0 mm/memory.c:3009
do_shared_fault mm/memory.c:4694 [inline]
do_fault mm/memory.c:4762 [inline]
handle_pte_fault mm/memory.c:5029 [inline]
__handle_mm_fault mm/memory.c:5171 [inline]
handle_mm_fault+0x199c/0x3d40 mm/memory.c:5292
do_user_addr_fault+0x5a9/0xbb0 arch/x86/mm/fault.c:1338
handle_page_fault arch/x86/mm/fault.c:1429 [inline]
exc_page_fault+0x60/0x100 arch/x86/mm/fault.c:1482
asm_exc_page_fault+0x22/0x30 arch/x86/include/asm/idtentry.h:608
RIP: 0033:0x7fd8b966cea3
RSP: 002b:00007fff903a2cf0 EFLAGS: 00010246
RAX: 00000000005ffde8 RBX: 0000000000000000 RCX: 0000001b2fc64000
RDX: 0000001b2fc24000 RSI: 0000000000600000 RDI: 00007fd8b99e7708
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 00007fff903a2f80
INFO: task syz.0.418:5533 blocked for more than 144 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.0.418 state:D stack:27600 pid:5533 ppid:4277 flags:0x00004004
Call Trace:
context_switch kernel/sched/core.c:5257 [inline]
__schedule+0x1089/0x4140 kernel/sched/core.c:6584
schedule+0xb9/0x180 kernel/sched/core.c:6660
io_schedule+0x7c/0xd0 kernel/sched/core.c:8848
bit_wait_io+0xf/0x100 kernel/sched/wait_bit.c:209
__wait_on_bit+0x9b/0x2c0 kernel/sched/wait_bit.c:49
out_of_line_wait_on_bit+0x138/0x190 kernel/sched/wait_bit.c:64
wait_on_bit_io include/linux/wait_bit.h:101 [inline]
do_get_write_access+0x605/0xf20 fs/jbd2/transaction.c:1115
jbd2_journal_get_write_access+0x108/0x140 fs/jbd2/transaction.c:1250
__ext4_journal_get_write_access+0x24b/0x6e0 fs/ext4/ext4_jbd2.c:235
ext4_reserve_inode_write+0x201/0x290 fs/ext4/inode.c:5978
__ext4_mark_inode_dirty+0x161/0x7b0 fs/ext4/inode.c:6162
ext4_dirty_inode+0xbf/0x100 fs/ext4/inode.c:6199
__mark_inode_dirty+0x2e7/0xe80 fs/fs-writeback.c:2515
generic_update_time fs/inode.c:1944 [inline]
inode_update_time fs/inode.c:1957 [inline]
__file_update_time+0x21d/0x240 fs/inode.c:2145
file_update_time+0x2f3/0x370 fs/inode.c:2176
ext4_page_mkwrite+0x1a9/0x10d0 fs/ext4/inode.c:6317
do_page_mkwrite+0x16b/0x5c0 mm/memory.c:3009
do_shared_fault mm/memory.c:4694 [inline]
do_fault mm/memory.c:4762 [inline]
handle_pte_fault mm/memory.c:5029 [inline]
__handle_mm_fault mm/memory.c:5171 [inline]
handle_mm_fault+0x199c/0x3d40 mm/memory.c:5292
do_user_addr_fault+0x5a9/0xbb0 arch/x86/mm/fault.c:1338
handle_page_fault arch/x86/mm/fault.c:1429 [inline]
exc_page_fault+0x60/0x100 arch/x86/mm/fault.c:1482
asm_exc_page_fault+0x22/0x30 arch/x86/include/asm/idtentry.h:608
RIP: 0033:0x7f4436c6cea3
RSP: 002b:00007ffee4e99240 EFLAGS: 00010246
RAX: 00000000005ffde8 RBX: 0000000000000000 RCX: 0000001b2fb64000
RDX: 0000001b2fb24000 RSI: 0000000000600000 RDI: 00007f4436fe7708
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 00007ffee4e994d0
Showing all locks held in the system:
5 locks held by kworker/u4:1/11:
1 lock held by rcu_tasks_kthre/12:
#0: ffffffff8db2e3f0 (rcu_tasks.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x33/0xce0 kernel/rcu/tasks.h:543
1 lock held by rcu_tasks_trace/13:
#0: ffffffff8db2ec30 (rcu_tasks_trace.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x33/0xce0 kernel/rcu/tasks.h:543
1 lock held by khungtaskd/28:
#0: ffffffff8db2daa0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:350 [inline]
#0: ffffffff8db2daa0 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:791 [inline]
#0: ffffffff8db2daa0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x51/0x290 kernel/locking/lockdep.c:6669
4 locks held by kworker/u4:2/41:
#0: ffff88801d649138 ((wq_completion)writeback){+.+.}-{0:0}, at: process_one_work+0x7b4/0x1160 kernel/workqueue.c:2267
#1: ffffc90000b27d00 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_one_work+0x7b4/0x1160 kernel/workqueue.c:2267
#2: ffff88814d3960e0 (&type->s_umount_key#31){++++}-{3:3}, at: trylock_super+0x1c/0xf0 fs/super.c:415
#3: ffff88814d848c18 (&sbi->s_writepages_rwsem){.+.+}-{0:0}, at: ext4_writepages_down_read fs/ext4/ext4.h:1785 [inline]
#3: ffff88814d848c18 (&sbi->s_writepages_rwsem){.+.+}-{0:0}, at: ext4_writepages+0x246/0x2fe0 fs/ext4/inode.c:2719
2 locks held by kworker/u4:3/48:
#0: ffff8880b8d3ad18 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x25/0x130 kernel/sched/core.c:549
#1: ffffc90000b97d00 ((work_completion)(&(&kfence_timer)->work)){+.+.}-{0:0}, at: process_one_work+0x7b4/0x1160 kernel/workqueue.c:2267
2 locks held by getty/4032:
#0: ffff88814d2d0098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x21/0x70 drivers/tty/tty_ldisc.c:244
#1: ffffc9000327b2f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x430/0x1400 drivers/tty/n_tty.c:2198
3 locks held by syz-executor/4263:
#0: ffff888078e0bd58 (&mm->mmap_lock){++++}-{3:3}, at: mmap_read_trylock include/linux/mmap_lock.h:136 [inline]
#0: ffff888078e0bd58 (&mm->mmap_lock){++++}-{3:3}, at: get_mmap_lock_carefully mm/memory.c:5320 [inline]
#0: ffff888078e0bd58 (&mm->mmap_lock){++++}-{3:3}, at: lock_mm_and_find_vma+0x2e/0x2f0 mm/memory.c:5382
#1: ffff88814d396558 (sb_pagefaults){.+.+}-{0:0}, at: __sb_start_write include/linux/fs.h:1897 [inline]
#1: ffff88814d396558 (sb_pagefaults){.+.+}-{0:0}, at: sb_start_pagefault include/linux/fs.h:2001 [inline]
#1: ffff88814d396558 (sb_pagefaults){.+.+}-{0:0}, at: ext4_page_mkwrite+0x192/0x10d0 fs/ext4/inode.c:6316
#2: ffff88814d84a990 (jbd2_handle){++++}-{0:0}, at: start_this_handle+0x2014/0x2240 fs/jbd2/transaction.c:463
3 locks held by syz.1.417/5532:
#0: ffff888076d626d8 (&mm->mmap_lock){++++}-{3:3}, at: mmap_read_trylock include/linux/mmap_lock.h:136 [inline]
#0: ffff888076d626d8 (&mm->mmap_lock){++++}-{3:3}, at: get_mmap_lock_carefully mm/memory.c:5320 [inline]
#0: ffff888076d626d8 (&mm->mmap_lock){++++}-{3:3}, at: lock_mm_and_find_vma+0x2e/0x2f0 mm/memory.c:5382
#1: ffff88814d396558 (sb_pagefaults){.+.+}-{0:0}, at: __sb_start_write include/linux/fs.h:1897 [inline]
#1: ffff88814d396558 (sb_pagefaults){.+.+}-{0:0}, at: sb_start_pagefault include/linux/fs.h:2001 [inline]
#1: ffff88814d396558 (sb_pagefaults){.+.+}-{0:0}, at: ext4_page_mkwrite+0x192/0x10d0 fs/ext4/inode.c:6316
#2: ffff88814d84a990 (jbd2_handle){++++}-{0:0}, at: start_this_handle+0x2014/0x2240 fs/jbd2/transaction.c:463
3 locks held by syz.0.418/5533:
#0: ffff888076d662d8 (&mm->mmap_lock){++++}-{3:3}, at: mmap_read_trylock include/linux/mmap_lock.h:136 [inline]
#0: ffff888076d662d8 (&mm->mmap_lock){++++}-{3:3}, at: get_mmap_lock_carefully mm/memory.c:5320 [inline]
#0: ffff888076d662d8 (&mm->mmap_lock){++++}-{3:3}, at: lock_mm_and_find_vma+0x2e/0x2f0 mm/memory.c:5382
#1: ffff88814d396558 (sb_pagefaults){.+.+}-{0:0}, at: __sb_start_write include/linux/fs.h:1897 [inline]
#1: ffff88814d396558 (sb_pagefaults){.+.+}-{0:0}, at: sb_start_pagefault include/linux/fs.h:2001 [inline]
#1: ffff88814d396558 (sb_pagefaults){.+.+}-{0:0}, at: ext4_page_mkwrite+0x192/0x10d0 fs/ext4/inode.c:6316
#2: ffff88814d84a990 (jbd2_handle){++++}-{0:0}, at: start_this_handle+0x2014/0x2240 fs/jbd2/transaction.c:463
=============================================
NMI backtrace for cpu 0
CPU: 0 PID: 28 Comm: khungtaskd Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/07/2026
Call Trace:
dump_stack_lvl+0x188/0x24e lib/dump_stack.c:106
nmi_cpu_backtrace+0x3e6/0x460 lib/nmi_backtrace.c:111
nmi_trigger_cpumask_backtrace+0x1d4/0x450 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:148 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:220 [inline]
watchdog+0xf0e/0xf50 kernel/hung_task.c:377
kthread+0x29d/0x330 kernel/kthread.c:376
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 11 Comm: kworker/u4:1 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/07/2026
Workqueue: events_unbound cfg80211_wiphy_work
RIP: 0010:ieee80211_bss_info_update+0x141/0xbf0 net/mac80211/scan.c:154
Code: 00 00 00 66 43 c7 44 3c 20 00 00 49 8d 5d 08 ba 30 00 00 00 4c 89 f7 31 f6 e8 1b 84 26 f8 48 89 d8 48 c1 e8 03 42 80 3c 38 00 <74> 08 48 89 df e8 55 82 26 f8 49 8b 45 08 48 89 84 24 50 01 00 00
RSP: 0018:ffffc90000107680 EFLAGS: 00000246
RAX: 1ffff1100e58296e RBX: ffff888072c14b70 RCX: 0000000000000000
RDX: 0000000000000030 RSI: 0000000000000000 RDI: ffffc900001077f0
RBP: ffffc90000107870 R08: ffffc900001077ef R09: ffffc900001077c0
R10: dffffc0000000000 R11: fffff52000020efe R12: 1ffff92000020edc
R13: ffff888072c14b68 R14: ffffc900001077c0 R15: dffffc0000000000
FS: 0000000000000000(0000) GS:ffff8880b8d00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000558a11f5b168 CR3: 000000000d88e000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
ieee80211_rx_bss_info net/mac80211/ibss.c:1119 [inline]
ieee80211_rx_mgmt_probe_beacon net/mac80211/ibss.c:1608 [inline]
ieee80211_ibss_rx_queued_mgmt+0x1931/0x2eb0 net/mac80211/ibss.c:1637
ieee80211_iface_process_skb net/mac80211/iface.c:1711 [inline]
ieee80211_iface_work+0x72c/0xc70 net/mac80211/iface.c:1765
cfg80211_wiphy_work+0x224/0x260 net/wireless/core.c:440
process_one_work+0x8ab/0x1160 kernel/workqueue.c:2292
worker_thread+0xaf5/0x12a0 kernel/workqueue.c:2439
kthread+0x29d/0x330 kernel/kthread.c:376
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295