INFO: task syz.7.4113:21897 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.7.4113 state:D stack:25536 pid:21897 tgid:21895 ppid:17176 task_flags:0x440040 flags:0x00080002
Call Trace:
context_switch kernel/sched/core.c:5298 [inline]
__schedule+0x15dd/0x52d0 kernel/sched/core.c:6911
__schedule_loop kernel/sched/core.c:6993 [inline]
schedule+0x164/0x360 kernel/sched/core.c:7008
schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:7065
rwsem_down_read_slowpath+0x61e/0x920 kernel/locking/rwsem.c:1086
__down_read_common kernel/locking/rwsem.c:1261 [inline]
__down_read kernel/locking/rwsem.c:1274 [inline]
down_read+0x99/0x2e0 kernel/locking/rwsem.c:1539
filemap_invalidate_lock_shared include/linux/fs.h:1093 [inline]
page_cache_ra_order+0x38c/0xeb0 mm/readahead.c:497
filemap_get_pages+0x4c0/0x1f10 mm/filemap.c:2695
filemap_splice_read+0x5cd/0xd10 mm/filemap.c:3084
do_splice_read fs/splice.c:980 [inline]
splice_direct_to_actor+0x478/0xc70 fs/splice.c:1084
do_splice_direct_actor fs/splice.c:1202 [inline]
do_splice_direct+0x195/0x290 fs/splice.c:1228
do_sendfile+0x535/0x7d0 fs/read_write.c:1372
__do_sys_sendfile64 fs/read_write.c:1433 [inline]
__se_sys_sendfile64+0x144/0x1a0 fs/read_write.c:1419
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fbdad19c799
RSP: 002b:00007fbdae047028 EFLAGS: 00000246 ORIG_RAX: 0000000000000028
RAX: ffffffffffffffda RBX: 00007fbdad415fa0 RCX: 00007fbdad19c799
RDX: 0000000000000000 RSI: 0000000000000004 RDI: 0000000000000003
RBP: 00007fbdad232c99 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000fffe80 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fbdad416038 R14: 00007fbdad415fa0 R15: 00007fbdad53fa48
Showing all locks held in the system:
1 lock held by khungtaskd/31:
#0: ffffffff8e75e520 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:312 [inline]
#0: ffffffff8e75e520 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:850 [inline]
#0: ffffffff8e75e520 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180 kernel/locking/lockdep.c:6775
2 locks held by getty/5577:
#0: ffff888036a210a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
#1: ffffc9000332b2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x45c/0x13c0 drivers/tty/n_tty.c:2211
2 locks held by udevd/5838:
8 locks held by kworker/0:5/5885:
1 lock held by syz.7.4113/21897:
#0: ffff88802359b748 (mapping.invalidate_lock){++++}-{4:4}, at: filemap_invalidate_lock_shared include/linux/fs.h:1093 [inline]
#0: ffff88802359b748 (mapping.invalidate_lock){++++}-{4:4}, at: page_cache_ra_order+0x38c/0xeb0 mm/readahead.c:497
2 locks held by syz.7.4113/21898:
1 lock held by syz.4.4132/21977:
#0: ffff88802359b748 (mapping.invalidate_lock){++++}-{4:4}, at: filemap_invalidate_lock_shared include/linux/fs.h:1093 [inline]
#0: ffff88802359b748 (mapping.invalidate_lock){++++}-{4:4}, at: page_cache_ra_order+0x38c/0xeb0 mm/readahead.c:497
1 lock held by syz.4.4132/21979:
#0: ffff88802359b748 (mapping.invalidate_lock){++++}-{4:4}, at: filemap_invalidate_lock_shared include/linux/fs.h:1093 [inline]
#0: ffff88802359b748 (mapping.invalidate_lock){++++}-{4:4}, at: page_cache_ra_order+0x38c/0xeb0 mm/readahead.c:497
1 lock held by syz.4.4132/21981:
#0: ffff88802359b748 (mapping.invalidate_lock){++++}-{4:4}, at: filemap_invalidate_lock_shared include/linux/fs.h:1093 [inline]
#0: ffff88802359b748 (mapping.invalidate_lock){++++}-{4:4}, at: page_cache_ra_order+0x38c/0xeb0 mm/readahead.c:497
1 lock held by syz.8.4236/22421:
#0: ffff88802359b748 (mapping.invalidate_lock){++++}-{4:4}, at: filemap_invalidate_lock_shared include/linux/fs.h:1093 [inline]
#0: ffff88802359b748 (mapping.invalidate_lock){++++}-{4:4}, at: page_cache_ra_order+0x38c/0xeb0 mm/readahead.c:497
1 lock held by syz.8.4236/22423:
#0: ffff88802359b748 (mapping.invalidate_lock){++++}-{4:4}, at: filemap_invalidate_lock_shared include/linux/fs.h:1093 [inline]
#0: ffff88802359b748 (mapping.invalidate_lock){++++}-{4:4}, at: page_cache_ra_order+0x38c/0xeb0 mm/readahead.c:497
=============================================
NMI backtrace for cpu 1
CPU: 1 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 02/12/2026
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:161 [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:346 [inline]
watchdog+0xfd9/0x1030 kernel/hung_task.c:515
kthread+0x388/0x470 kernel/kthread.c:436
ret_from_fork+0x51e/0xb90 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 0 Comm: swapper/0 Tainted: G L syzkaller #0 PREEMPT(full)
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
RIP: 0010:pv_native_safe_halt+0xf/0x20 arch/x86/kernel/paravirt.c:63
Code: ae 6c 02 c3 cc cc cc cc cc cc cc 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 e3 12 1b 00 fb f4 fc e9 02 00 cc cc cc cc cc cc cc cc cc cc cc cc 90 90 90 90 90
RSP: 0018:ffffffff8e407dc0 EFLAGS: 00000242
RAX: 0000000001b405bf RBX: ffffffff819a8e5a RCX: 0000000080000001
RDX: 0000000000000001 RSI: ffffffff8def714b RDI: ffffffff8c27c180
RBP: ffffffff8e407eb0 R08: ffff8880b863395b R09: 1ffff110170c672b
R10: dffffc0000000000 R11: ffffed10170c672c R12: ffffffff90119cb0
R13: 0000000000000000 R14: 0000000000000000 R15: 1ffffffff1c929d8
FS: 0000000000000000(0000) GS:ffff888125460000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000555570aef4e8 CR3: 000000007e83e000 CR4: 00000000003526f0
Call Trace:
arch_safe_halt arch/x86/kernel/process.c:766 [inline]
default_idle+0x9/0x20 arch/x86/kernel/process.c:767
default_idle_call+0x72/0xb0 kernel/sched/idle.c:122
cpuidle_idle_call kernel/sched/idle.c:191 [inline]
do_idle+0x1ba/0x5d0 kernel/sched/idle.c:341
cpu_startup_entry+0x43/0x60 kernel/sched/idle.c:439
rest_init+0x2de/0x300 init/main.c:760
start_kernel+0x385/0x3d0 init/main.c:1210
x86_64_start_reservations+0x24/0x30 arch/x86/kernel/head64.c:310
x86_64_start_kernel+0x143/0x1c0 arch/x86/kernel/head64.c:291
common_startup_64+0x13e/0x147