INFO: task syz.1.1921:12948 blocked for more than 143 seconds.
Tainted: G L syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.1.1921 state:D stack:27480 pid:12948 tgid:12946 ppid:5649 task_flags:0x400040 flags:0x00080002
Call Trace:
context_switch kernel/sched/core.c:5388 [inline]
__schedule+0x1821/0x5740 kernel/sched/core.c:7189
__schedule_loop kernel/sched/core.c:7268 [inline]
schedule+0x164/0x360 kernel/sched/core.c:7283
schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:7340
rwsem_down_write_slowpath+0x883/0x1080 kernel/locking/rwsem.c:1215
__down_write_common kernel/locking/rwsem.c:1347 [inline]
__down_write kernel/locking/rwsem.c:1356 [inline]
down_write+0x1bc/0x200 kernel/locking/rwsem.c:1626
inode_lock include/linux/fs.h:1029 [inline]
blkdev_fallocate+0x260/0x530 block/fops.c:907
vfs_fallocate+0x669/0x7e0 fs/open.c:338
ksys_fallocate fs/open.c:362 [inline]
__do_sys_fallocate fs/open.c:367 [inline]
__se_sys_fallocate fs/open.c:365 [inline]
__x64_sys_fallocate+0xc0/0x110 fs/open.c:365
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f399e19ce59
RSP: 002b:00007f399f000028 EFLAGS: 00000246 ORIG_RAX: 000000000000011d
RAX: ffffffffffffffda RBX: 00007f399e416090 RCX: 00007f399e19ce59
RDX: 0000000000000600 RSI: 0000000000000011 RDI: 0000000000000004
RBP: 00007f399e232d6f R08: 0000000000000000 R09: 0000000000000000
R10: 000000000007c000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f399e416128 R14: 00007f399e416090 R15: 00007f399e53fa48
Showing all locks held in the system:
1 lock held by khungtaskd/31:
#0: ffffffff8e95cc20 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:300 [inline]
#0: ffffffff8e95cc20 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:838 [inline]
#0: ffffffff8e95cc20 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180 kernel/locking/lockdep.c:6775
2 locks held by getty/5388:
#0: ffff8880360fe0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
#1: ffffc9000322b2e8 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x45c/0x13a0 drivers/tty/n_tty.c:2211
2 locks held by syz.4.1897/12843:
#0: ffff888023094168 (&sb->s_type->i_mutex_key#10){++++}-{4:4}, at: inode_lock include/linux/fs.h:1029 [inline]
#0: ffff888023094168 (&sb->s_type->i_mutex_key#10){++++}-{4:4}, at: blkdev_fallocate+0x260/0x530 block/fops.c:907
#1: ffff888023094300 (mapping.invalidate_lock){++++}-{4:4}, at: filemap_invalidate_lock include/linux/fs.h:1084 [inline]
#1: ffff888023094300 (mapping.invalidate_lock){++++}-{4:4}, at: blkdev_fallocate+0x290/0x530 block/fops.c:908
1 lock held by syz.1.1921/12948:
#0: ffff888023094168 (&sb->s_type->i_mutex_key#10){++++}-{4:4}, at: inode_lock include/linux/fs.h:1029 [inline]
#0: ffff888023094168 (&sb->s_type->i_mutex_key#10){++++}-{4:4}, at: blkdev_fallocate+0x260/0x530 block/fops.c:907
2 locks held by syz.8.2138/13852:
#0: ffff888036460948 (vm_lock){++++}-{0:0}, at: lock_vma_under_rcu+0x1d1/0x500 mm/mmap_lock.c:310
#1: ffff888023094300 (mapping.invalidate_lock){++++}-{4:4}, at: filemap_invalidate_lock_shared include/linux/fs.h:1094 [inline]
#1: ffff888023094300 (mapping.invalidate_lock){++++}-{4:4}, at: filemap_fault+0x95e/0x1300 mm/filemap.c:3562
2 locks held by syz.8.2138/13853:
#0: ffff8880558b27f8 (&mm->mmap_lock){++++}-{4:4}, at: mmap_read_lock include/linux/mmap_lock.h:592 [inline]
#0: ffff8880558b27f8 (&mm->mmap_lock){++++}-{4:4}, at: __mm_populate+0x182/0x390 mm/gup.c:1942
#1: ffff888023094300 (mapping.invalidate_lock){++++}-{4:4}, at: filemap_invalidate_lock_shared include/linux/fs.h:1094 [inline]
#1: ffff888023094300 (mapping.invalidate_lock){++++}-{4:4}, at: filemap_fault+0x95e/0x1300 mm/filemap.c:3562
1 lock held by syz.7.2154/13914:
#0: ffff888023094300 (mapping.invalidate_lock){++++}-{4:4}, at: filemap_invalidate_lock_shared include/linux/fs.h:1094 [inline]
#0: ffff888023094300 (mapping.invalidate_lock){++++}-{4:4}, at: page_cache_ra_order+0x37a/0xe80 mm/readahead.c:497
1 lock held by syz.7.2154/13915:
#0: ffff888023094300 (mapping.invalidate_lock){++++}-{4:4}, at: filemap_invalidate_lock_shared include/linux/fs.h:1094 [inline]
#0: ffff888023094300 (mapping.invalidate_lock){++++}-{4:4}, at: page_cache_ra_order+0x37a/0xe80 mm/readahead.c:497
1 lock held by syz.6.2182/14007:
#0: ffff888023094300 (mapping.invalidate_lock){++++}-{4:4}, at: filemap_invalidate_lock_shared include/linux/fs.h:1094 [inline]
#0: ffff888023094300 (mapping.invalidate_lock){++++}-{4:4}, at: page_cache_ra_order+0x37a/0xe80 mm/readahead.c:497
1 lock held by syz.3.2233/14344:
#0: ffff888023094300 (mapping.invalidate_lock){++++}-{4:4}, at: filemap_invalidate_lock_shared include/linux/fs.h:1094 [inline]
#0: ffff888023094300 (mapping.invalidate_lock){++++}-{4:4}, at: page_cache_ra_order+0x37a/0xe80 mm/readahead.c:497
1 lock held by syz.3.2233/14345:
#0: ffff888023094300 (mapping.invalidate_lock){++++}-{4:4}, at: filemap_invalidate_lock_shared include/linux/fs.h:1094 [inline]
#0: ffff888023094300 (mapping.invalidate_lock){++++}-{4:4}, at: page_cache_ra_order+0x37a/0xe80 mm/readahead.c:497
1 lock held by syz.0.2266/14546:
#0: ffff888023094300 (mapping.invalidate_lock){++++}-{4:4}, at: filemap_invalidate_lock_shared include/linux/fs.h:1094 [inline]
#0: ffff888023094300 (mapping.invalidate_lock){++++}-{4:4}, at: page_cache_ra_order+0x37a/0xe80 mm/readahead.c:497
1 lock held by syz.0.2266/14548:
#0: ffff888023094300 (mapping.invalidate_lock){++++}-{4:4}, at: filemap_invalidate_lock_shared include/linux/fs.h:1094 [inline]
#0: ffff888023094300 (mapping.invalidate_lock){++++}-{4:4}, at: page_cache_ra_order+0x37a/0xe80 mm/readahead.c:497
1 lock held by syz.0.2266/14549:
#0: ffff888023094300 (mapping.invalidate_lock){++++}-{4:4}, at: filemap_invalidate_lock_shared include/linux/fs.h:1094 [inline]
#0: ffff888023094300 (mapping.invalidate_lock){++++}-{4:4}, at: page_cache_ra_order+0x37a/0xe80 mm/readahead.c:497
1 lock held by syz.9.2288/14665:
#0: ffff888023094300 (mapping.invalidate_lock){++++}-{4:4}, at: filemap_invalidate_lock_shared include/linux/fs.h:1094 [inline]
#0: ffff888023094300 (mapping.invalidate_lock){++++}-{4:4}, at: page_cache_ra_order+0x37a/0xe80 mm/readahead.c:497
1 lock held by syz.9.2288/14669:
#0: ffff888023094300 (mapping.invalidate_lock){++++}-{4:4}, at: filemap_invalidate_lock_shared include/linux/fs.h:1094 [inline]
#0: ffff888023094300 (mapping.invalidate_lock){++++}-{4:4}, at: page_cache_ra_order+0x37a/0xe80 mm/readahead.c:497
1 lock held by syz.2.2334/14971:
#0: ffffffff8e962f28 (rcu_state.exp_mutex){+.+.}-{4:4}, at: exp_funnel_lock kernel/rcu/tree_exp.h:311 [inline]
#0: ffffffff8e962f28 (rcu_state.exp_mutex){+.+.}-{4:4}, at: synchronize_rcu_expedited+0x2d0/0x770 kernel/rcu/tree_exp.h:961
1 lock held by syz.8.2315/14981:
#0: ffffffff8e962df8 (rcu_state.barrier_mutex){+.+.}-{4:4}, at: rcu_barrier+0x4c/0x580 kernel/rcu/tree.c:3828
2 locks held by syz.4.2340/14995:
=============================================
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 31 Comm: khungtaskd Tainted: G L syzkaller #0 PREEMPT(full)
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
Call Trace:
dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
nmi_cpu_backtrace+0x274/0x2d0 lib/nmi_backtrace.c:113
nmi_trigger_cpumask_backtrace+0x17a/0x300 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:162 [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:353 [inline]
watchdog+0xfd3/0x1030 kernel/hung_task.c:561
kthread+0x389/0x470 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
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 5750 Comm: kworker/1:8 Tainted: G L syzkaller #0 PREEMPT(full)
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
Workqueue: usb_hub_wq hub_event
RIP: 0010:rcu_read_lock_any_held+0x48/0x90 kernel/rcu/update.c:387
Code: 84 c0 74 44 48 c7 c7 20 cc 95 8e be ff ff ff ff e8 6d 9b fd 09 85 c0 75 2a 48 c7 c7 80 cc 95 8e be ff ff ff ff e8 58 9b fd 09 <85> c0 75 15 48 c7 c7 e0 cc 95 8e be ff ff ff ff e8 43 9b fd 09 85
RSP: 0018:ffffc90000a08c58 EFLAGS: 00000046
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000080010003
RDX: 0000000000000000 RSI: ffffffff8e217295 RDI: ffffffff8c28b9e0
RBP: 0000000000000006 R08: ffff88801bed8167 R09: 1ffff110037db02c
R10: dffffc0000000000 R11: ffffed10037db02d R12: 0000000000000001
R13: ffff88807e835d00 R14: 0000000000000001 R15: ffffffff8e262798
FS: 0000000000000000(0000) GS:ffff8881253a0000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000208030 CR3: 00000000808f0000 CR4: 00000000003526f0
DR0: 0000000000000004 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Call Trace:
select_idle_sibling kernel/sched/fair.c:8187 [inline]
select_task_rq_fair+0xbb0/0x43b0 kernel/sched/fair.c:8891
select_task_rq kernel/sched/core.c:3579 [inline]
try_to_wake_up+0x4db/0x1380 kernel/sched/core.c:4290
hrtimer_wakeup+0x4e/0x60 kernel/time/hrtimer.c:2191
__run_hrtimer kernel/time/hrtimer.c:1930 [inline]
__hrtimer_run_queues+0x3c0/0xa20 kernel/time/hrtimer.c:1994
hrtimer_interrupt+0x44b/0x950 kernel/time/hrtimer.c:2113
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1050 [inline]
__sysvec_apic_timer_interrupt+0x102/0x430 arch/x86/kernel/apic/apic.c:1067
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1061 [inline]
sysvec_apic_timer_interrupt+0xa1/0xc0 arch/x86/kernel/apic/apic.c:1061
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:console_trylock_spinning kernel/printk/printk.c:2039 [inline]
RIP: 0010:vprintk_emit+0x45d/0x560 kernel/printk/printk.c:2478
Code: 0f 84 44 ff ff ff e8 b2 2b 21 00 fb eb 44 e8 aa 2b 21 00 e8 f5 e8 02 0a 4d 85 f6 74 94 e8 9b 2b 21 00 fb 48 c7 c7 40 f0 94 8e <31> f6 ba 01 00 00 00 31 c9 41 b8 01 00 00 00 45 31 c9 53 e8 cb 18
RSP: 0018:ffffc90004b17380 EFLAGS: 00000283
RAX: ffffffff81a48c45 RBX: ffffffff81a48abf RCX: 0000000000100000
RDX: ffffc9001a3ec000 RSI: 0000000000010f28 RDI: ffffffff8e94f040
RBP: ffffc90004b17430 R08: ffffffff903036f7 R09: 1ffffffff20606de
R10: dffffc0000000000 R11: fffffbfff20606df R12: 0000000000000000
R13: 0000000000000029 R14: 0000000000000200 R15: 1ffff92000962e74
dev_vprintk_emit+0x355/0x420 drivers/base/core.c:4930
dev_printk_emit+0xee/0x140 drivers/base/core.c:4941
_dev_info+0x11e/0x180 drivers/base/core.c:4999
usb_disconnect+0xdd/0x990 drivers/usb/core/hub.c:2327
hub_port_connect drivers/usb/core/hub.c:5407 [inline]
hub_port_connect_change drivers/usb/core/hub.c:5707 [inline]
port_event drivers/usb/core/hub.c:5871 [inline]
hub_event+0x1cc9/0x4f30 drivers/usb/core/hub.c:5953
process_one_work kernel/workqueue.c:3314 [inline]
process_scheduled_works+0xb5d/0x1860 kernel/workqueue.c:3397
worker_thread+0xa53/0xfc0 kernel/workqueue.c:3478
kthread+0x389/0x470 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