INFO: task kworker/u4:0:9 blocked for more than 143 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/u4:0 state:D stack:21232 pid: 9 ppid: 2 flags:0x00004000
Workqueue: writeback wb_workfn (flush-8:0)
Call Trace:
context_switch kernel/sched/core.c:5049 [inline]
__schedule+0x11c3/0x4350 kernel/sched/core.c:6395
schedule+0x11b/0x1e0 kernel/sched/core.c:6478
io_schedule+0x7c/0xd0 kernel/sched/core.c:8503
bit_wait_io+0xd/0xc0 kernel/sched/wait_bit.c:209
__wait_on_bit kernel/sched/wait_bit.c:49 [inline]
out_of_line_wait_on_bit+0x173/0x230 kernel/sched/wait_bit.c:64
wait_on_bit_io include/linux/wait_bit.h:101 [inline]
do_get_write_access+0x134/0xe40 fs/jbd2/transaction.c:1116
jbd2_journal_get_write_access+0x108/0x140 fs/jbd2/transaction.c:1251
__ext4_journal_get_write_access+0x24d/0x6e0 fs/ext4/ext4_jbd2.c:235
ext4_mb_mark_diskspace_used+0x27d/0x14e0 fs/ext4/mballoc.c:3885
ext4_mb_new_blocks+0x11ab/0x47c0 fs/ext4/mballoc.c:5806
ext4_ext_map_blocks+0x17d1/0x63d0 fs/ext4/extents.c:4372
ext4_map_blocks+0x97f/0x1a50 fs/ext4/inode.c:675
mpage_map_one_extent fs/ext4/inode.c:2410 [inline]
mpage_map_and_submit_extent fs/ext4/inode.c:2463 [inline]
ext4_writepages+0x124a/0x2d40 fs/ext4/inode.c:2831
do_writepages+0x493/0x700 mm/page-writeback.c:2386
__writeback_single_inode+0x153/0xda0 fs/fs-writeback.c:1657
writeback_sb_inodes+0xaaa/0x1750 fs/fs-writeback.c:1940
__writeback_inodes_wb+0x12a/0x3f0 fs/fs-writeback.c:2011
wb_writeback+0x45e/0xbc0 fs/fs-writeback.c:2116
wb_check_start_all fs/fs-writeback.c:2238 [inline]
wb_do_writeback fs/fs-writeback.c:2264 [inline]
wb_workfn+0x924/0xf20 fs/fs-writeback.c:2298
process_one_work+0x867/0xff0 kernel/workqueue.c:2310
worker_thread+0xad7/0x12a0 kernel/workqueue.c:2457
kthread+0x42e/0x520 kernel/kthread.c:334
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
INFO: task jbd2/sda1-8:3520 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:25840 pid: 3520 ppid: 2 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:5049 [inline]
__schedule+0x11c3/0x4350 kernel/sched/core.c:6395
schedule+0x11b/0x1e0 kernel/sched/core.c:6478
io_schedule+0x7c/0xd0 kernel/sched/core.c:8503
bit_wait_io+0xd/0xc0 kernel/sched/wait_bit.c:209
__wait_on_bit kernel/sched/wait_bit.c:49 [inline]
out_of_line_wait_on_bit+0x173/0x230 kernel/sched/wait_bit.c:64
wait_on_buffer include/linux/buffer_head.h:390 [inline]
jbd2_journal_commit_transaction+0x2f0b/0x5c30 fs/jbd2/commit.c:848
kjournald2+0x45a/0x900 fs/jbd2/journal.c:213
kthread+0x42e/0x520 kernel/kthread.c:334
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
INFO: task syz.0.155:4924 blocked for more than 144 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.0.155 state:D stack:18704 pid: 4924 ppid: 4186 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:5049 [inline]
__schedule+0x11c3/0x4350 kernel/sched/core.c:6395
schedule+0x11b/0x1e0 kernel/sched/core.c:6478
io_schedule+0x7c/0xd0 kernel/sched/core.c:8503
wait_on_page_bit_common+0x8bf/0xeb0 mm/filemap.c:1356
wait_on_page_writeback+0x122/0x180 mm/page-writeback.c:2909
shrink_page_list+0x5ba1/0x6de0 mm/vmscan.c:1516
shrink_inactive_list mm/vmscan.c:2223 [inline]
shrink_list mm/vmscan.c:2450 [inline]
shrink_lruvec+0x1315/0x25a0 mm/vmscan.c:2769
shrink_node_memcgs mm/vmscan.c:2956 [inline]
shrink_node+0x1190/0x2790 mm/vmscan.c:3079
shrink_zones mm/vmscan.c:3285 [inline]
do_try_to_free_pages+0x60e/0x1600 mm/vmscan.c:3340
try_to_free_mem_cgroup_pages+0x347/0x800 mm/vmscan.c:3654
try_charge_memcg+0x42f/0x15b0 mm/memcontrol.c:2654
try_charge mm/memcontrol.c:2779 [inline]
charge_memcg+0x100/0x300 mm/memcontrol.c:6771
__mem_cgroup_charge+0x21/0x80 mm/memcontrol.c:6807
mem_cgroup_charge include/linux/memcontrol.h:700 [inline]
__add_to_page_cache_locked+0x937/0xec0 mm/filemap.c:892
add_to_page_cache_lru+0x153/0x4a0 mm/filemap.c:984
page_cache_ra_unbounded+0x400/0x8f0 mm/readahead.c:222
page_cache_async_readahead include/linux/pagemap.h:856 [inline]
do_async_mmap_readahead mm/filemap.c:3023 [inline]
filemap_fault+0x600/0x13a0 mm/filemap.c:3079
__do_fault+0x141/0x330 mm/memory.c:3928
do_read_fault mm/memory.c:4264 [inline]
do_fault mm/memory.c:4392 [inline]
handle_pte_fault mm/memory.c:4650 [inline]
__handle_mm_fault mm/memory.c:4785 [inline]
handle_mm_fault+0x2982/0x4440 mm/memory.c:4883
faultin_page mm/gup.c:976 [inline]
__get_user_pages+0x952/0x11e0 mm/gup.c:1197
__get_user_pages_locked mm/gup.c:1382 [inline]
get_dump_page+0x18c/0x670 mm/gup.c:1838
dump_user_range+0x54/0x340 fs/coredump.c:1013
elf_core_dump+0x2fe0/0x3530 fs/binfmt_elf.c:2285
do_coredump+0x14e8/0x2a40 fs/coredump.c:894
get_signal+0x531/0x12e0 kernel/signal.c:2899
arch_do_signal_or_restart+0xe6/0x12a0 arch/x86/kernel/signal.c:867
handle_signal_work kernel/entry/common.c:157 [inline]
exit_to_user_mode_loop+0x9e/0x130 kernel/entry/common.c:181
exit_to_user_mode_prepare+0xee/0x180 kernel/entry/common.c:217
irqentry_exit_to_user_mode+0x5/0x30 kernel/entry/common.c:323
exc_page_fault+0x88/0x100 arch/x86/mm/fault.c:1499
asm_exc_page_fault+0x22/0x30 arch/x86/include/asm/idtentry.h:606
RIP: 0033:0x7f6d1c5a31e1
RSP: 002b:fffffffffffffe90 EFLAGS: 00010217
RAX: 0000000000000000 RBX: 00007f6d1c82b180 RCX: 00007f6d1c5a31d9
RDX: 0000000000000000 RSI: fffffffffffffe90 RDI: 0000000080008000
RBP: 00007f6d1c63a888 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000
R13: 00007f6d1c82b218 R14: 00007f6d1c82b180 R15: 00007ffd7e0571b8
INFO: task syz.0.155:4936 blocked for more than 144 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.0.155 state:D stack:19024 pid: 4936 ppid: 4186 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:5049 [inline]
__schedule+0x11c3/0x4350 kernel/sched/core.c:6395
schedule+0x11b/0x1e0 kernel/sched/core.c:6478
io_schedule+0x7c/0xd0 kernel/sched/core.c:8503
wait_on_page_bit_common+0x8bf/0xeb0 mm/filemap.c:1356
wait_on_page_writeback+0x122/0x180 mm/page-writeback.c:2909
shrink_page_list+0x5ba1/0x6de0 mm/vmscan.c:1516
shrink_inactive_list mm/vmscan.c:2223 [inline]
shrink_list mm/vmscan.c:2450 [inline]
shrink_lruvec+0x1315/0x25a0 mm/vmscan.c:2769
shrink_node_memcgs mm/vmscan.c:2956 [inline]
shrink_node+0x1190/0x2790 mm/vmscan.c:3079
shrink_zones mm/vmscan.c:3285 [inline]
do_try_to_free_pages+0x60e/0x1600 mm/vmscan.c:3340
try_to_free_mem_cgroup_pages+0x347/0x800 mm/vmscan.c:3654
try_charge_memcg+0x42f/0x15b0 mm/memcontrol.c:2654
try_charge mm/memcontrol.c:2779 [inline]
charge_memcg+0x100/0x300 mm/memcontrol.c:6771
__mem_cgroup_charge+0x21/0x80 mm/memcontrol.c:6807
mem_cgroup_charge include/linux/memcontrol.h:700 [inline]
shmem_add_to_page_cache+0xa8a/0x14d0 mm/shmem.c:718
shmem_getpage_gfp+0x1735/0x2c10 mm/shmem.c:1940
shmem_getpage mm/shmem.c:151 [inline]
shmem_write_begin+0xcd/0x1a0 mm/shmem.c:2474
generic_perform_write+0x2b6/0x550 mm/filemap.c:3785
__generic_file_write_iter+0x261/0x4e0 mm/filemap.c:3912
generic_file_write_iter+0xa6/0x1b0 mm/filemap.c:3944
__kernel_write+0x522/0x980 fs/read_write.c:539
__dump_emit+0x258/0x380 fs/coredump.c:943
dump_user_range+0x84/0x340 fs/coredump.c:1017
elf_core_dump+0x2fe0/0x3530 fs/binfmt_elf.c:2285
do_coredump+0x14e8/0x2a40 fs/coredump.c:894
get_signal+0x531/0x12e0 kernel/signal.c:2899
arch_do_signal_or_restart+0xe6/0x12a0 arch/x86/kernel/signal.c:867
handle_signal_work kernel/entry/common.c:157 [inline]
exit_to_user_mode_loop+0x9e/0x130 kernel/entry/common.c:181
exit_to_user_mode_prepare+0xee/0x180 kernel/entry/common.c:217
irqentry_exit_to_user_mode+0x5/0x30 kernel/entry/common.c:323
exc_page_fault+0x88/0x100 arch/x86/mm/fault.c:1499
asm_exc_page_fault+0x22/0x30 arch/x86/include/asm/idtentry.h:606
RIP: 0033:0x7f6d1c5a31e1
RSP: 002b:fffffffffffffe90 EFLAGS: 00010217
RAX: 0000000000000000 RBX: 00007f6d1c82b180 RCX: 00007f6d1c5a31d9
RDX: 0000000000000000 RSI: fffffffffffffe90 RDI: 0000000080008000
RBP: 00007f6d1c63a888 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000
R13: 00007f6d1c82b218 R14: 00007f6d1c82b180 R15: 00007ffd7e0571b8
Showing all locks held in the system:
6 locks held by kworker/u4:0/9:
#0: ffff88801a5a0138 ((wq_completion)writeback){+.+.}-{0:0}, at: process_one_work+0x75c/0xff0 kernel/workqueue.c:-1
#1: ffffc90000ce7d00 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_one_work+0x79e/0xff0 kernel/workqueue.c:2285
#2: ffff88814d1e40e0 (&type->s_umount_key#32){++++}-{3:3}, at: trylock_super+0x1c/0xf0 fs/super.c:418
#3: ffff88814d1e6c58 (&sbi->s_writepages_rwsem){.+.+}-{0:0}, at: ext4_writepages+0x213/0x2d40 fs/ext4/inode.c:2691
#4: ffff88814d014990 (jbd2_handle){++++}-{0:0}, at: start_this_handle+0x12d5/0x1560 fs/jbd2/transaction.c:462
#5: ffff888074e7e628 (&ei->i_data_sem){++++}-{3:3}, at: ext4_map_blocks+0x8c4/0x1a50 fs/ext4/inode.c:668
1 lock held by khungtaskd/27:
#0: ffffffff8d11efa0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x0/0x30
2 locks held by getty/3944:
#0: ffff88814c837098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x21/0x70 drivers/tty/tty_ldisc.c:252
#1: ffffc90002d032e8 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x594/0x1a50 drivers/tty/n_tty.c:2158
2 locks held by syz.0.155/4911:
#0: ffff888079316460 (sb_writers#3){.+.+}-{0:0}, at: do_coredump+0x14c4/0x2a40 fs/coredump.c:893
#1: ffff888074e7d550 (mapping.invalidate_lock){++++}-{3:3}, at: filemap_invalidate_lock_shared include/linux/fs.h:848 [inline]
#1: ffff888074e7d550 (mapping.invalidate_lock){++++}-{3:3}, at: filemap_fault+0x69f/0x13a0 mm/filemap.c:3081
2 locks held by syz.0.155/4912:
#0: ffff888079316460 (sb_writers#3){.+.+}-{0:0}, at: do_coredump+0x14c4/0x2a40 fs/coredump.c:893
#1: ffff888074e7d550 (mapping.invalidate_lock){++++}-{3:3}, at: filemap_invalidate_lock_shared include/linux/fs.h:848 [inline]
#1: ffff888074e7d550 (mapping.invalidate_lock){++++}-{3:3}, at: filemap_fault+0x69f/0x13a0 mm/filemap.c:3081
2 locks held by syz.0.155/4921:
#0: ffff888079316460 (sb_writers#3){.+.+}-{0:0}, at: do_coredump+0x14c4/0x2a40 fs/coredump.c:893
#1: ffff888074e7d550 (mapping.invalidate_lock){++++}-{3:3}, at: filemap_invalidate_lock_shared include/linux/fs.h:848 [inline]
#1: ffff888074e7d550 (mapping.invalidate_lock){++++}-{3:3}, at: filemap_fault+0x69f/0x13a0 mm/filemap.c:3081
2 locks held by syz.0.155/4924:
#0: ffff888079316460 (sb_writers#3){.+.+}-{0:0}, at: do_coredump+0x14c4/0x2a40 fs/coredump.c:893
#1: ffff888074e7d550 (mapping.invalidate_lock){++++}-{3:3}, at: filemap_invalidate_lock_shared include/linux/fs.h:848 [inline]
#1: ffff888074e7d550 (mapping.invalidate_lock){++++}-{3:3}, at: page_cache_ra_unbounded+0x19a/0x8f0 mm/readahead.c:195
2 locks held by syz.0.155/4925:
#0: ffff888079316460 (sb_writers#3){.+.+}-{0:0}, at: do_coredump+0x14c4/0x2a40 fs/coredump.c:893
#1: ffff888074e7d550 (mapping.invalidate_lock){++++}-{3:3}, at: filemap_invalidate_lock_shared include/linux/fs.h:848 [inline]
#1: ffff888074e7d550 (mapping.invalidate_lock){++++}-{3:3}, at: filemap_fault+0x69f/0x13a0 mm/filemap.c:3081
2 locks held by syz.0.155/4926:
#0: ffff888079316460 (sb_writers#3){.+.+}-{0:0}, at: do_coredump+0x14c4/0x2a40 fs/coredump.c:893
#1: ffff888074e7d550 (mapping.invalidate_lock){++++}-{3:3}, at: filemap_invalidate_lock_shared include/linux/fs.h:848 [inline]
#1: ffff888074e7d550 (mapping.invalidate_lock){++++}-{3:3}, at: filemap_fault+0x69f/0x13a0 mm/filemap.c:3081
2 locks held by syz.0.155/4930:
#0: ffff888079316460 (sb_writers#3){.+.+}-{0:0}, at: do_coredump+0x14c4/0x2a40 fs/coredump.c:893
#1: ffff888074e7d550 (mapping.invalidate_lock){++++}-{3:3}, at: filemap_invalidate_lock_shared include/linux/fs.h:848 [inline]
#1: ffff888074e7d550 (mapping.invalidate_lock){++++}-{3:3}, at: filemap_fault+0x69f/0x13a0 mm/filemap.c:3081
2 locks held by syz.0.155/4931:
#0: ffff888079316460 (sb_writers#3){.+.+}-{0:0}, at: do_coredump+0x14c4/0x2a40 fs/coredump.c:893
#1: ffff888074e7d550 (mapping.invalidate_lock){++++}-{3:3}, at: filemap_invalidate_lock_shared include/linux/fs.h:848 [inline]
#1: ffff888074e7d550 (mapping.invalidate_lock){++++}-{3:3}, at: filemap_fault+0x69f/0x13a0 mm/filemap.c:3081
2 locks held by syz.0.155/4933:
#0: ffff888079316460 (sb_writers#3){.+.+}-{0:0}, at: do_coredump+0x14c4/0x2a40 fs/coredump.c:893
#1: ffff888074e7d550 (mapping.invalidate_lock){++++}-{3:3}, at: filemap_invalidate_lock_shared include/linux/fs.h:848 [inline]
#1: ffff888074e7d550 (mapping.invalidate_lock){++++}-{3:3}, at: filemap_fault+0x69f/0x13a0 mm/filemap.c:3081
2 locks held by syz.0.155/4935:
#0: ffff888079316460 (sb_writers#3){.+.+}-{0:0}, at: do_coredump+0x14c4/0x2a40 fs/coredump.c:893
#1: ffff888074e7d550 (mapping.invalidate_lock){++++}-{3:3}, at: filemap_invalidate_lock_shared include/linux/fs.h:848 [inline]
#1: ffff888074e7d550 (mapping.invalidate_lock){++++}-{3:3}, at: filemap_fault+0x69f/0x13a0 mm/filemap.c:3081
2 locks held by syz.0.155/4936:
#0: ffff888079316460 (sb_writers#3){.+.+}-{0:0}, at: do_coredump+0x14c4/0x2a40 fs/coredump.c:893
#1: ffff888023e8cd18 (&sb->s_type->i_mutex_key#8){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:793 [inline]
#1: ffff888023e8cd18 (&sb->s_type->i_mutex_key#8){+.+.}-{3:3}, at: generic_file_write_iter+0x7e/0x1b0 mm/filemap.c:3941
2 locks held by syz.0.155/4937:
#0: ffff888079316460 (sb_writers#3){.+.+}-{0:0}, at: do_coredump+0x14c4/0x2a40 fs/coredump.c:893
#1: ffff888074e7d550 (mapping.invalidate_lock){++++}-{3:3}, at: filemap_invalidate_lock_shared include/linux/fs.h:848 [inline]
#1: ffff888074e7d550 (mapping.invalidate_lock){++++}-{3:3}, at: filemap_fault+0x69f/0x13a0 mm/filemap.c:3081
=============================================
NMI backtrace for cpu 1
CPU: 1 PID: 27 Comm: khungtaskd Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026
Call Trace:
dump_stack_lvl+0x188/0x250 lib/dump_stack.c:106
nmi_cpu_backtrace+0x3a2/0x3d0 lib/nmi_backtrace.c:111
nmi_trigger_cpumask_backtrace+0x163/0x280 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:148 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:212 [inline]
watchdog+0xe1b/0xe60 kernel/hung_task.c:369
kthread+0x42e/0x520 kernel/kthread.c:334
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 4226 Comm: kworker/u4:4 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026
Workqueue: events_unbound cfg80211_wiphy_work
RIP: 0010:ieee80211_sta_get_rates+0x35a/0x6c0 net/mac80211/util.c:2130
Code: 03 42 80 3c 30 00 74 08 4c 89 ff e8 d0 cd 67 f8 48 63 c3 48 8d 2c 40 48 c1 e5 02 49 03 2f 48 89 e8 48 c1 e8 03 42 0f b6 04 30 <84> c0 0f 85 f9 00 00 00 44 8b 75 00 44 0b 74 24 3c bf ff ff ff ff
RSP: 0018:ffffc9000313f8b8 EFLAGS: 00000a02
RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffff88802a1d0000
RDX: 0000000000000000 RSI: 0000000000000082 RDI: 00000000000000ff
RBP: ffff8880772edeb0 R08: ffffffff8e6b282f R09: 1ffffffff1cd6505
R10: dffffc0000000000 R11: fffffbfff1cd6506 R12: 000000000000000b
R13: 000000000000000a R14: dffffc0000000000 R15: ffff8880772eb3b0
FS: 0000000000000000(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055d48528aaa8 CR3: 000000002be44000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
ieee80211_update_sta_info net/mac80211/ibss.c:1007 [inline]
ieee80211_rx_bss_info net/mac80211/ibss.c:1121 [inline]
ieee80211_rx_mgmt_probe_beacon net/mac80211/ibss.c:1614 [inline]
ieee80211_ibss_rx_queued_mgmt+0xf79/0x2b50 net/mac80211/ibss.c:1643
ieee80211_iface_process_skb net/mac80211/iface.c:1467 [inline]
ieee80211_iface_work+0x714/0xc50 net/mac80211/iface.c:1521
cfg80211_wiphy_work+0x224/0x260 net/wireless/core.c:433
process_one_work+0x867/0xff0 kernel/workqueue.c:2310
worker_thread+0xad7/0x12a0 kernel/workqueue.c:2457
kthread+0x42e/0x520 kernel/kthread.c:334
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287