INFO: task kworker/u8:0:12 blocked for more than 143 seconds.
Tainted: G U I L syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/u8:0 state:D stack:24296 pid:12 tgid:12 ppid:2 task_flags:0x4248060 flags:0x00080000
Workqueue: writeback wb_workfn (flush-8:0)
Call Trace:
context_switch kernel/sched/core.c:5260 [inline]
__schedule+0xfe4/0x5e10 kernel/sched/core.c:6867
__schedule_loop kernel/sched/core.c:6949 [inline]
schedule+0xdd/0x390 kernel/sched/core.c:6964
io_schedule+0x8a/0xf0 kernel/sched/core.c:7791
bit_wait_io+0xd/0xe0 kernel/sched/wait_bit.c:250
__wait_on_bit+0x65/0x180 kernel/sched/wait_bit.c:52
out_of_line_wait_on_bit+0xdc/0x110 kernel/sched/wait_bit.c:67
wait_on_bit_io include/linux/wait_bit.h:105 [inline]
do_get_write_access+0x82f/0x1190 fs/jbd2/transaction.c:1092
jbd2_journal_get_write_access+0x1d6/0x280 fs/jbd2/transaction.c:1242
__ext4_journal_get_write_access+0x6a/0x340 fs/ext4/ext4_jbd2.c:241
ext4_reserve_inode_write+0x1b7/0x330 fs/ext4/inode.c:6290
__ext4_mark_inode_dirty+0x18f/0x840 fs/ext4/inode.c:6465
ext4_dirty_inode+0xd9/0x130 fs/ext4/inode.c:6502
__mark_inode_dirty+0x1ec/0x1560 fs/fs-writeback.c:2595
mark_inode_dirty_sync include/linux/fs.h:2202 [inline]
dquot_claim_block include/linux/quotaops.h:363 [inline]
ext4_da_update_reserve_space+0x2ac/0x6e0 fs/ext4/inode.c:359
ext4_es_insert_extent+0xa6b/0x10b0 fs/ext4/extents_status.c:989
ext4_map_create_blocks fs/ext4/inode.c:663 [inline]
ext4_map_blocks+0x735/0x13c0 fs/ext4/inode.c:816
mpage_map_one_extent fs/ext4/inode.c:2380 [inline]
mpage_map_and_submit_extent fs/ext4/inode.c:2474 [inline]
ext4_do_writepages+0x21ee/0x3df0 fs/ext4/inode.c:2932
ext4_writepages+0x347/0x790 fs/ext4/inode.c:3026
do_writepages+0x278/0x600 mm/page-writeback.c:2598
__writeback_single_inode+0x164/0x13c0 fs/fs-writeback.c:1737
writeback_sb_inodes+0x72e/0x1b90 fs/fs-writeback.c:2030
__writeback_inodes_wb+0xf8/0x2d0 fs/fs-writeback.c:2107
wb_writeback+0x6b4/0xab0 fs/fs-writeback.c:2218
wb_check_old_data_flush fs/fs-writeback.c:2322 [inline]
wb_do_writeback fs/fs-writeback.c:2375 [inline]
wb_workfn+0x885/0xbb0 fs/fs-writeback.c:2403
process_one_work+0x9c2/0x1840 kernel/workqueue.c:3257
process_scheduled_works kernel/workqueue.c:3340 [inline]
worker_thread+0x5da/0xe40 kernel/workqueue.c:3421
kthread+0x3b3/0x730 kernel/kthread.c:463
ret_from_fork+0x754/0xaf0 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246
INFO: task khugepaged:38 blocked for more than 143 seconds.
Tainted: G U I L syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:khugepaged state:D stack:26728 pid:38 tgid:38 ppid:2 task_flags:0x200040 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5260 [inline]
__schedule+0xfe4/0x5e10 kernel/sched/core.c:6867
__schedule_loop kernel/sched/core.c:6949 [inline]
schedule+0xdd/0x390 kernel/sched/core.c:6964
schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:7021
rwsem_down_write_slowpath+0x530/0x1280 kernel/locking/rwsem.c:1185
__down_write_common kernel/locking/rwsem.c:1317 [inline]
__down_write kernel/locking/rwsem.c:1326 [inline]
down_write+0x1c7/0x1f0 kernel/locking/rwsem.c:1591
mmap_write_lock include/linux/mmap_lock.h:335 [inline]
collapse_huge_page+0x54a/0x3840 mm/khugepaged.c:1153
hpage_collapse_scan_pmd+0xd5e/0x1600 mm/khugepaged.c:1407
khugepaged_scan_mm_slot mm/khugepaged.c:2486 [inline]
khugepaged_do_scan mm/khugepaged.c:2570 [inline]
khugepaged+0x1215/0x16a0 mm/khugepaged.c:2626
kthread+0x3b3/0x730 kernel/kthread.c:463
ret_from_fork+0x754/0xaf0 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246
INFO: task jbd2/sda1-8:5159 blocked for more than 144 seconds.
Tainted: G U I L syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:jbd2/sda1-8 state:D stack:25736 pid:5159 tgid:5159 ppid:2 task_flags:0x240040 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5260 [inline]
__schedule+0xfe4/0x5e10 kernel/sched/core.c:6867
__schedule_loop kernel/sched/core.c:6949 [inline]
schedule+0xdd/0x390 kernel/sched/core.c:6964
io_schedule+0x8a/0xf0 kernel/sched/core.c:7791
bit_wait_io+0xd/0xe0 kernel/sched/wait_bit.c:250
__wait_on_bit+0x65/0x180 kernel/sched/wait_bit.c:52
out_of_line_wait_on_bit+0xdc/0x110 kernel/sched/wait_bit.c:67
wait_on_bit_io include/linux/wait_bit.h:105 [inline]
__wait_on_buffer+0x64/0x70 fs/buffer.c:123
wait_on_buffer include/linux/buffer_head.h:420 [inline]
jbd2_journal_commit_transaction+0x379c/0x6680 fs/jbd2/commit.c:808
kjournald2+0x200/0x760 fs/jbd2/journal.c:201
kthread+0x3b3/0x730 kernel/kthread.c:463
ret_from_fork+0x754/0xaf0 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246
INFO: task syz-executor:5814 blocked for more than 144 seconds.
Tainted: G U I L syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor state:D stack:21880 pid:5814 tgid:5814 ppid:5813 task_flags:0x440100 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5260 [inline]
__schedule+0xfe4/0x5e10 kernel/sched/core.c:6867
__schedule_loop kernel/sched/core.c:6949 [inline]
schedule+0xdd/0x390 kernel/sched/core.c:6964
io_schedule+0x8a/0xf0 kernel/sched/core.c:7791
bit_wait_io+0xd/0xe0 kernel/sched/wait_bit.c:250
__wait_on_bit+0x65/0x180 kernel/sched/wait_bit.c:52
out_of_line_wait_on_bit+0xdc/0x110 kernel/sched/wait_bit.c:67
wait_on_bit_io include/linux/wait_bit.h:105 [inline]
do_get_write_access+0x82f/0x1190 fs/jbd2/transaction.c:1092
jbd2_journal_get_write_access+0x1d6/0x280 fs/jbd2/transaction.c:1242
__ext4_journal_get_write_access+0x6a/0x340 fs/ext4/ext4_jbd2.c:241
ext4_reserve_inode_write+0x1b7/0x330 fs/ext4/inode.c:6290
__ext4_mark_inode_dirty+0x18f/0x840 fs/ext4/inode.c:6465
ext4_dirty_inode+0xd9/0x130 fs/ext4/inode.c:6502
__mark_inode_dirty+0x1ec/0x1560 fs/fs-writeback.c:2595
generic_update_time+0xcf/0xf0 fs/inode.c:2158
inode_update_time fs/inode.c:2171 [inline]
file_update_time_flags+0x401/0x510 fs/inode.c:2398
ext4_page_mkwrite+0x35b/0x1980 fs/ext4/inode.c:6668
do_page_mkwrite+0x17a/0x440 mm/memory.c:3531
wp_page_shared mm/memory.c:3932 [inline]
do_wp_page+0x4aa/0x4c10 mm/memory.c:4151
handle_pte_fault mm/memory.c:6292 [inline]
__handle_mm_fault+0x1ac0/0x2b50 mm/memory.c:6414
handle_mm_fault+0x36d/0xa20 mm/memory.c:6583
do_user_addr_fault+0x5a3/0x12f0 arch/x86/mm/fault.c:1334
handle_page_fault arch/x86/mm/fault.c:1474 [inline]
exc_page_fault+0x6f/0xd0 arch/x86/mm/fault.c:1527
asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:618
RIP: 0033:0x7efd478795a7
RSP: 002b:00007ffe8a987620 EFLAGS: 00010202
RAX: 00007efd463bc000 RBX: 000055557d75a230 RCX: 0000000000000005
RDX: 0000000000000a82 RSI: 000055557d75ab30 RDI: 0000000000000020
RBP: 00007ffe8a987b20 R08: 000000000000031e R09: 000055557d75ab50
R10: 0000000000000000 R11: 0000000000000202 R12: 00007ffe8a987960
R13: 00007ffe8a987750 R14: 585858582e7a7973 R15: 00007ffe8a9876a0
INFO: task syz.4.3870:23021 blocked for more than 144 seconds.
Tainted: G U I L syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.4.3870 state:D stack:22824 pid:23021 tgid:23021 ppid:18113 task_flags:0x400640 flags:0x00080001
Call Trace:
context_switch kernel/sched/core.c:5260 [inline]
__schedule+0xfe4/0x5e10 kernel/sched/core.c:6867
__schedule_loop kernel/sched/core.c:6949 [inline]
schedule+0xdd/0x390 kernel/sched/core.c:6964
io_schedule+0x8a/0xf0 kernel/sched/core.c:7791
folio_wait_bit_common+0x414/0xa70 mm/filemap.c:1323
__folio_lock mm/filemap.c:1699 [inline]
lock_folio_maybe_drop_mmap mm/filemap.c:3288 [inline]
filemap_fault+0x5fb/0x37c0 mm/filemap.c:3570
__do_fault+0x10d/0x550 mm/memory.c:5323
do_read_fault mm/memory.c:5758 [inline]
do_fault+0xaf9/0x1990 mm/memory.c:5892
do_pte_missing mm/memory.c:4404 [inline]
handle_pte_fault mm/memory.c:6276 [inline]
__handle_mm_fault+0x1807/0x2b50 mm/memory.c:6414
handle_mm_fault+0x36d/0xa20 mm/memory.c:6583
faultin_page mm/gup.c:1126 [inline]
__get_user_pages+0xf9c/0x34d0 mm/gup.c:1428
__get_user_pages_locked mm/gup.c:1692 [inline]
get_dump_page+0x27e/0x3d0 mm/gup.c:2192
dump_user_range+0x18d/0xb50 fs/coredump.c:1366
elf_core_dump+0x2d16/0x3c60 fs/binfmt_elf.c:2111
coredump_write fs/coredump.c:1049 [inline]
do_coredump fs/coredump.c:1126 [inline]
vfs_coredump+0x276c/0x5530 fs/coredump.c:1200
get_signal+0x1f2a/0x21e0 kernel/signal.c:3019
arch_do_signal_or_restart+0x91/0x770 arch/x86/kernel/signal.c:337
__exit_to_user_mode_loop kernel/entry/common.c:41 [inline]
exit_to_user_mode_loop kernel/entry/common.c:75 [inline]
__exit_to_user_mode_prepare include/linux/irq-entry-common.h:226 [inline]
irqentry_exit_to_user_mode_prepare include/linux/irq-entry-common.h:270 [inline]
irqentry_exit_to_user_mode include/linux/irq-entry-common.h:339 [inline]
irqentry_exit+0x1f8/0x670 kernel/entry/common.c:196
asm_exc_invalid_op+0x1a/0x20 arch/x86/include/asm/idtentry.h:616
RIP: 0033:0x14
RSP: 002b:0000000000005ff3 EFLAGS: 00010202
RAX: 0000000000000000 RBX: 00007f416ee16180 RCX: 00007f416eb9aeb9
RDX: 0000000000000000 RSI: 0000000000005feb RDI: 0000000000000002
RBP: 00007f416ec08c1f R08: 0002000000000003 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f416ee16218 R14: 00007f416ee16180 R15: 00007ffca3e0eeb8
INFO: task syz.5.3887:23092 blocked for more than 145 seconds.
Tainted: G U I L syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.5.3887 state:D stack:26584 pid:23092 tgid:23092 ppid:15856 task_flags:0x440040 flags:0x00080002
Call Trace:
context_switch kernel/sched/core.c:5260 [inline]
__schedule+0xfe4/0x5e10 kernel/sched/core.c:6867
__schedule_loop kernel/sched/core.c:6949 [inline]
schedule+0xdd/0x390 kernel/sched/core.c:6964
io_schedule+0x8a/0xf0 kernel/sched/core.c:7791
bit_wait_io+0xd/0xe0 kernel/sched/wait_bit.c:250
__wait_on_bit+0x65/0x180 kernel/sched/wait_bit.c:52
out_of_line_wait_on_bit+0xdc/0x110 kernel/sched/wait_bit.c:67
wait_on_bit_io include/linux/wait_bit.h:105 [inline]
do_get_write_access+0x82f/0x1190 fs/jbd2/transaction.c:1092
jbd2_journal_get_write_access+0x1d6/0x280 fs/jbd2/transaction.c:1242
__ext4_journal_get_write_access+0x6a/0x340 fs/ext4/ext4_jbd2.c:241
ext4_reserve_inode_write+0x1b7/0x330 fs/ext4/inode.c:6290
__ext4_mark_inode_dirty+0x18f/0x840 fs/ext4/inode.c:6465
ext4_dirty_inode+0xd9/0x130 fs/ext4/inode.c:6502
__mark_inode_dirty+0x1ec/0x1560 fs/fs-writeback.c:2595
generic_update_time+0xcf/0xf0 fs/inode.c:2158
inode_update_time fs/inode.c:2171 [inline]
file_update_time_flags+0x401/0x510 fs/inode.c:2398
ext4_page_mkwrite+0x35b/0x1980 fs/ext4/inode.c:6668
do_page_mkwrite+0x17a/0x440 mm/memory.c:3531
do_shared_fault mm/memory.c:5834 [inline]
do_fault+0x3d7/0x1990 mm/memory.c:5896
do_pte_missing mm/memory.c:4404 [inline]
handle_pte_fault mm/memory.c:6276 [inline]
__handle_mm_fault+0x1807/0x2b50 mm/memory.c:6414
handle_mm_fault+0x36d/0xa20 mm/memory.c:6583
do_user_addr_fault+0x5a3/0x12f0 arch/x86/mm/fault.c:1334
handle_page_fault arch/x86/mm/fault.c:1474 [inline]
exc_page_fault+0x6f/0xd0 arch/x86/mm/fault.c:1527
asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:618
RIP: 0033:0x7f4abe46f6c0
RSP: 002b:00007ffd8bcf5390 EFLAGS: 00010202
RAX: 0000001b33400000 RBX: ffffffff8175d983 RCX: 0000001b333ffff8
RDX: 0000001b32e24220 RSI: 0000000000000008 RDI: 00007f4abf345720
RBP: 00000000000001ae R08: 00007f4abe800000 R09: 00007f4abe802000
R10: 000000008175d987 R11: 000000000000000d R12: 00007f4abe816218
R13: 0000000000000203 R14: ffffffff8175d053 R15: 00007f4abf345720
INFO: task syz.4.3888:23096 blocked for more than 145 seconds.
Tainted: G U I L syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.4.3888 state:D stack:27976 pid:23096 tgid:23096 ppid:18113 task_flags:0x440040 flags:0x00080002
Call Trace:
context_switch kernel/sched/core.c:5260 [inline]
__schedule+0xfe4/0x5e10 kernel/sched/core.c:6867
__schedule_loop kernel/sched/core.c:6949 [inline]
schedule+0xdd/0x390 kernel/sched/core.c:6964
io_schedule+0x8a/0xf0 kernel/sched/core.c:7791
bit_wait_io+0xd/0xe0 kernel/sched/wait_bit.c:250
__wait_on_bit+0x65/0x180 kernel/sched/wait_bit.c:52
out_of_line_wait_on_bit+0xdc/0x110 kernel/sched/wait_bit.c:67
wait_on_bit_io include/linux/wait_bit.h:105 [inline]
do_get_write_access+0x82f/0x1190 fs/jbd2/transaction.c:1092
jbd2_journal_get_write_access+0x1d6/0x280 fs/jbd2/transaction.c:1242
__ext4_journal_get_write_access+0x6a/0x340 fs/ext4/ext4_jbd2.c:241
ext4_reserve_inode_write+0x1b7/0x330 fs/ext4/inode.c:6290
__ext4_mark_inode_dirty+0x18f/0x840 fs/ext4/inode.c:6465
ext4_dirty_inode+0xd9/0x130 fs/ext4/inode.c:6502
__mark_inode_dirty+0x1ec/0x1560 fs/fs-writeback.c:2595
generic_update_time+0xcf/0xf0 fs/inode.c:2158
inode_update_time fs/inode.c:2171 [inline]
file_update_time_flags+0x401/0x510 fs/inode.c:2398
ext4_page_mkwrite+0x35b/0x1980 fs/ext4/inode.c:6668
do_page_mkwrite+0x17a/0x440 mm/memory.c:3531
do_shared_fault mm/memory.c:5834 [inline]
do_fault+0x3d7/0x1990 mm/memory.c:5896
do_pte_missing mm/memory.c:4404 [inline]
handle_pte_fault mm/memory.c:6276 [inline]
__handle_mm_fault+0x1807/0x2b50 mm/memory.c:6414
handle_mm_fault+0x36d/0xa20 mm/memory.c:6583
do_user_addr_fault+0x5a3/0x12f0 arch/x86/mm/fault.c:1334
handle_page_fault arch/x86/mm/fault.c:1474 [inline]
exc_page_fault+0x6f/0xd0 arch/x86/mm/fault.c:1527
asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:618
RIP: 0033:0x7f416ea6f6c0
RSP: 002b:00007ffca3e0ef00 EFLAGS: 00010202
RAX: 0000001b30223000 RBX: ffffffff82a9b7ac RCX: 0000001b30222ff8
RDX: 0000001b2fc24218 RSI: 0000000000000008 RDI: 00007f416f945720
RBP: 0000000000000201 R08: 00007f416ee00000 R09: 00007f416ee02000
R10: 0000000082a9b7b0 R11: 0000000000000000 R12: 00007f416ee16038
R13: 000000000000026c R14: ffffffff82a9b1e5 R15: 00007f416f945720
INFO: task syz.0.3890:23099 blocked for more than 146 seconds.
Tainted: G U I L syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.0.3890 state:D stack:27640 pid:23099 tgid:23099 ppid:16744 task_flags:0x440040 flags:0x00080002
Call Trace:
context_switch kernel/sched/core.c:5260 [inline]
__schedule+0xfe4/0x5e10 kernel/sched/core.c:6867
__schedule_loop kernel/sched/core.c:6949 [inline]
schedule+0xdd/0x390 kernel/sched/core.c:6964
io_schedule+0x8a/0xf0 kernel/sched/core.c:7791
bit_wait_io+0xd/0xe0 kernel/sched/wait_bit.c:250
__wait_on_bit+0x65/0x180 kernel/sched/wait_bit.c:52
out_of_line_wait_on_bit+0xdc/0x110 kernel/sched/wait_bit.c:67
wait_on_bit_io include/linux/wait_bit.h:105 [inline]
do_get_write_access+0x82f/0x1190 fs/jbd2/transaction.c:1092
jbd2_journal_get_write_access+0x1d6/0x280 fs/jbd2/transaction.c:1242
__ext4_journal_get_write_access+0x6a/0x340 fs/ext4/ext4_jbd2.c:241
ext4_reserve_inode_write+0x1b7/0x330 fs/ext4/inode.c:6290
__ext4_mark_inode_dirty+0x18f/0x840 fs/ext4/inode.c:6465
ext4_dirty_inode+0xd9/0x130 fs/ext4/inode.c:6502
__mark_inode_dirty+0x1ec/0x1560 fs/fs-writeback.c:2595
generic_update_time+0xcf/0xf0 fs/inode.c:2158
inode_update_time fs/inode.c:2171 [inline]
file_update_time_flags+0x401/0x510 fs/inode.c:2398
ext4_page_mkwrite+0x35b/0x1980 fs/ext4/inode.c:6668
do_page_mkwrite+0x17a/0x440 mm/memory.c:3531
do_shared_fault mm/memory.c:5834 [inline]
do_fault+0x3d7/0x1990 mm/memory.c:5896
do_pte_missing mm/memory.c:4404 [inline]
handle_pte_fault mm/memory.c:6276 [inline]
__handle_mm_fault+0x1807/0x2b50 mm/memory.c:6414
handle_mm_fault+0x36d/0xa20 mm/memory.c:6583
do_user_addr_fault+0x5a3/0x12f0 arch/x86/mm/fault.c:1334
handle_page_fault arch/x86/mm/fault.c:1474 [inline]
exc_page_fault+0x6f/0xd0 arch/x86/mm/fault.c:1527
asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:618
RIP: 0033:0x7f906326f6c0
RSP: 002b:00007fff56ff5740 EFLAGS: 00010202
RAX: 0000001b33124000 RBX: ffffffff893de6eb RCX: 0000001b33123ff8
RDX: 00000000003ffde8 RSI: 00000000003ffde8 RDI: 00007f9064145700
RBP: 0000000000000001 R08: 0000000000000000 R09: 00007f9063602000
R10: 00007f9064145700 R11: 0000000000000000 R12: 00007f9063616038
R13: 0000000000000000 R14: ffffffff893def81 R15: 00007f9064145720
Showing all locks held in the system:
6 locks held by kworker/u8:0/12:
#0: ffff888140ee3948 ((wq_completion)writeback){+.+.}-{0:0}, at: process_one_work+0x11ae/0x1840 kernel/workqueue.c:3232
#1: ffffc90000117c98 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_one_work+0x927/0x1840 kernel/workqueue.c:3233
#2: ffff8880334d20e0 (&type->s_umount_key#32){++++}-{4:4}, at: super_trylock_shared+0x1e/0xf0 fs/super.c:563
#3: ffff8880334d4b98 (&sbi->s_writepages_rwsem){++++}-{0:0}, at: do_writepages+0x278/0x600 mm/page-writeback.c:2598
#4: ffff8880334d6950 (jbd2_handle){++++}-{0:0}, at: start_this_handle+0xfaa/0x13a0 fs/jbd2/transaction.c:444
#5: ffff8880771c15b0 (&ei->i_data_sem){++++}-{4:4}, at: ext4_map_blocks+0x469/0x13c0 fs/ext4/inode.c:815
1 lock held by khungtaskd/31:
#0: ffffffff8e5e3120 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
#0: ffffffff8e5e3120 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:867 [inline]
#0: ffffffff8e5e3120 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x3d/0x184 kernel/locking/lockdep.c:6775
1 lock held by khugepaged/38:
#0: ffff888035fc8340 (&mm->mmap_lock){++++}-{4:4}, at: mmap_write_lock include/linux/mmap_lock.h:335 [inline]
#0: ffff888035fc8340 (&mm->mmap_lock){++++}-{4:4}, at: collapse_huge_page+0x54a/0x3840 mm/khugepaged.c:1153
3 locks held by syz-executor/5814:
#0: ffff88807e9b7a88 (vm_lock){++++}-{0:0}, at: lock_vma_under_rcu+0x11d/0x5a0 mm/mmap_lock.c:259
#1: ffff8880334d2518 (sb_pagefaults){.+.+}-{0:0}, at: do_page_mkwrite+0x17a/0x440 mm/memory.c:3531
#2: ffff8880334d6950 (jbd2_handle){++++}-{0:0}, at: start_this_handle+0xfaa/0x13a0 fs/jbd2/transaction.c:444
2 locks held by getty/18620:
#0: ffff88814e2cd0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x24/0x80 drivers/tty/tty_ldisc.c:243
#1: ffffc90004a7b2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x419/0x1500 drivers/tty/n_tty.c:2211
2 locks held by syz.4.3870/23021:
#0: ffff888142ef6420 (sb_writers#5){.+.+}-{0:0}, at: get_signal+0x1f2a/0x21e0 kernel/signal.c:3019
#1: ffff888035fc8340 (&mm->mmap_lock){++++}-{4:4}, at: mmap_read_lock_killable include/linux/mmap_lock.h:400 [inline]
#1: ffff888035fc8340 (&mm->mmap_lock){++++}-{4:4}, at: dump_user_range+0x151/0xb50 fs/coredump.c:1354
3 locks held by syz.5.3887/23092:
#0: ffff8880344ba588 (vm_lock){++++}-{0:0}, at: lock_vma_under_rcu+0x11d/0x5a0 mm/mmap_lock.c:259
#1: ffff8880334d2518 (sb_pagefaults){.+.+}-{0:0}, at: do_page_mkwrite+0x17a/0x440 mm/memory.c:3531
#2: ffff8880334d6950 (jbd2_handle){++++}-{0:0}, at: start_this_handle+0xfaa/0x13a0 fs/jbd2/transaction.c:444
3 locks held by syz.4.3888/23096:
#0: ffff88803037e808 (vm_lock){++++}-{0:0}, at: lock_vma_under_rcu+0x11d/0x5a0 mm/mmap_lock.c:259
#1: ffff8880334d2518 (sb_pagefaults){.+.+}-{0:0}, at: do_page_mkwrite+0x17a/0x440 mm/memory.c:3531
#2: ffff8880334d6950 (jbd2_handle){++++}-{0:0}, at: start_this_handle+0xfaa/0x13a0 fs/jbd2/transaction.c:444
3 locks held by syz.0.3890/23099:
#0: ffff88803165e448 (vm_lock){++++}-{0:0}, at: lock_vma_under_rcu+0x11d/0x5a0 mm/mmap_lock.c:259
#1: ffff8880334d2518 (sb_pagefaults){.+.+}-{0:0}, at: do_page_mkwrite+0x17a/0x440 mm/memory.c:3531
#2: ffff8880334d6950 (jbd2_handle){++++}-{0:0}, at: start_this_handle+0xfaa/0x13a0 fs/jbd2/transaction.c:444
=============================================
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 31 Comm: khungtaskd Tainted: G U I L syzkaller #0 PREEMPT(full)
Tainted: [U]=USER, [I]=FIRMWARE_WORKAROUND, [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/13/2026
Call Trace:
__dump_stack lib/dump_stack.c:94 [inline]
dump_stack_lvl+0x100/0x190 lib/dump_stack.c:120
nmi_cpu_backtrace.cold+0x12d/0x151 lib/nmi_backtrace.c:113
nmi_trigger_cpumask_backtrace+0x1d7/0x230 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:161 [inline]
__sys_info lib/sys_info.c:157 [inline]
sys_info+0x141/0x190 lib/sys_info.c:165
check_hung_uninterruptible_tasks kernel/hung_task.c:346 [inline]
watchdog+0xcc3/0xfe0 kernel/hung_task.c:515
kthread+0x3b3/0x730 kernel/kthread.c:463
ret_from_fork+0x754/0xaf0 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 0 Comm: swapper/0 Tainted: G U I L syzkaller #0 PREEMPT(full)
Tainted: [U]=USER, [I]=FIRMWARE_WORKAROUND, [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/13/2026
RIP: 0010:account_other_time+0x7/0x320 kernel/sched/cputime.c:276
Code: 48 89 df e8 4b 95 94 00 eb d9 66 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 48 c7 c0 54 a2 b7 90 <41> 56 48 ba 00 00 00 00 00 fc ff df 48 89 c1 41 55 83 e0 07 48 c1
RSP: 0018:ffffc90000007ce0 EFLAGS: 00000002
RAX: ffffffff90b7a254 RBX: 0000000000989680 RCX: ffffffff81f6ed9c
RDX: 0000000000000001 RSI: 0000000000000000 RDI: ffffffffffffffff
RBP: ffffffff8e297ac0 R08: 0000000000000003 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000000
R13: 1ffff92000000fa4 R14: 0000000000000000 R15: ffff8880b8428da0
FS: 0000000000000000(0000) GS:ffff8881245e3000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f7e13a41700 CR3: 00000000593e6000 CR4: 00000000003526f0
Call Trace:
irqtime_account_process_tick+0x22/0x170 kernel/sched/cputime.c:379
update_process_times+0x75/0x2d0 kernel/time/timer.c:2472
tick_sched_handle kernel/time/tick-sched.c:298 [inline]
tick_nohz_handler+0x27b/0x720 kernel/time/tick-sched.c:319
__run_hrtimer kernel/time/hrtimer.c:1777 [inline]
__hrtimer_run_queues+0x1ad/0x990 kernel/time/hrtimer.c:1841
hrtimer_interrupt+0x397/0x8c0 kernel/time/hrtimer.c:1903
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1045 [inline]
__sysvec_apic_timer_interrupt+0x109/0x3c0 arch/x86/kernel/apic/apic.c:1062
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1056 [inline]
sysvec_apic_timer_interrupt+0x9e/0xc0 arch/x86/kernel/apic/apic.c:1056
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:pv_native_safe_halt+0xf/0x20 arch/x86/kernel/paravirt.c:82
Code: a6 7a 02 c3 cc cc cc cc 0f 1f 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 66 90 0f 00 2d 23 7b 17 00 fb f4 fc 31 03 00 66 2e 0f 1f 84 00 00 00 00 00 66 90 90 90 90 90 90
RSP: 0018:ffffffff8e207e00 EFLAGS: 00000242
RAX: 000000000072b70d RBX: ffffffff8e297ac0 RCX: ffffffff8b7404b5
RDX: 0000000000000000 RSI: ffffffff8dc413ca RDI: ffffffff8bfa32a0
RBP: 0000000000000000 R08: 0000000000000001 R09: ffffed101708673d
R10: ffff8880b84339eb R11: 0000000000000000 R12: fffffbfff1c52f58
R13: 0000000000000000 R14: ffffffff90b771d0 R15: 0000000000000000
arch_safe_halt arch/x86/include/asm/paravirt.h:107 [inline]
default_idle+0x9/0x10 arch/x86/kernel/process.c:767
default_idle_call+0x6c/0xb0 kernel/sched/idle.c:122
cpuidle_idle_call kernel/sched/idle.c:191 [inline]
do_idle+0x35b/0x4b0 kernel/sched/idle.c:332
cpu_startup_entry+0x4f/0x60 kernel/sched/idle.c:430
rest_init+0x251/0x260 init/main.c:757
start_kernel+0x47a/0x480 init/main.c:1206
x86_64_start_reservations+0x24/0x30 arch/x86/kernel/head64.c:310
x86_64_start_kernel+0x122/0x130 arch/x86/kernel/head64.c:291
common_startup_64+0x13e/0x148