INFO: task syz.1.293:5446 blocked for more than 143 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.1.293 state:D stack:24976 pid: 5446 ppid: 4188 flags:0x00004004
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
schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6537
rwsem_down_read_slowpath+0x53e/0x9b0 kernel/locking/rwsem.c:1055
__down_read_common kernel/locking/rwsem.c:1239 [inline]
__down_read kernel/locking/rwsem.c:1252 [inline]
down_read+0x96/0x2e0 kernel/locking/rwsem.c:1500
iterate_supers+0xa4/0x1d0 fs/super.c:716
drop_caches_sysctl_handler+0x8e/0x160 fs/drop_caches.c:62
proc_sys_call_handler+0x458/0x6c0 fs/proc/proc_sysctl.c:588
do_iter_readv_writev+0x47d/0x5f0 fs/read_write.c:-1
do_iter_write+0x1f8/0x7a0 fs/read_write.c:855
iter_file_splice_write+0x6be/0xcf0 fs/splice.c:689
do_splice_from fs/splice.c:767 [inline]
direct_splice_actor+0xe1/0x130 fs/splice.c:956
splice_direct_to_actor+0x4e8/0xc00 fs/splice.c:902
do_splice_direct+0x1d4/0x2f0 fs/splice.c:1008
do_sendfile+0x524/0xe30 fs/read_write.c:1249
__do_sys_sendfile64 fs/read_write.c:1311 [inline]
__se_sys_sendfile64+0xdc/0x1a0 fs/read_write.c:1303
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7fbff81ac159
RSP: 002b:00007fbff63e3028 EFLAGS: 00000246 ORIG_RAX: 0000000000000028
RAX: ffffffffffffffda RBX: 00007fbff8434090 RCX: 00007fbff81ac159
RDX: 0000200000002080 RSI: 0000000000000003 RDI: 0000000000000005
RBP: 00007fbff8243024 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000010 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fbff8434128 R14: 00007fbff8434090 R15: 00007ffe9d9e92b8
Showing all locks held in the system:
3 locks held by kworker/u4:0/9:
1 lock held by khungtaskd/27:
#0: ffffffff8c31ef60 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x0/0x30
2 locks held by getty/3947:
#0: ffff88802c2ad098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x21/0x70 drivers/tty/tty_ldisc.c:252
#1: ffffc90002cf62e8 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x594/0x1a50 drivers/tty/n_tty.c:2158
1 lock held by syz-executor/4198:
#0: ffff88807bd000e0 (&type->s_umount_key#92){++++}-{3:3}, at: deactivate_super+0xa0/0xd0 fs/super.c:365
2 locks held by syz.1.293/5446:
#0: ffff888025984460 (sb_writers#4){.+.+}-{0:0}, at: do_sendfile+0x4ff/0xe30 fs/read_write.c:1248
#1: ffff88807bd000e0 (&type->s_umount_key#92){++++}-{3:3}, at: iterate_supers+0xa4/0x1d0 fs/super.c:716
1 lock held by syz.7.939/8182:
7 locks held by syz.5.940/8188:
1 lock held by syz.3.942/8191:
=============================================
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 07/24/2026
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: 8182 Comm: syz.7.939 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
RIP: 0010:asm_sysvec_apic_timer_interrupt+0x0/0x20 arch/x86/include/asm/idtentry.h:675
Code: e9 e5 04 00 00 90 90 90 90 90 0f 01 ca fc 6a ff e8 e5 03 00 00 48 89 c4 48 89 e7 e8 2a 42 e0 ff e9 c5 04 00 00 90 90 90 90 90 <0f> 01 ca fc 6a ff e8 c5 03 00 00 48 89 c4 48 89 e7 e8 7a 40 e0 ff
RSP: 0018:ffffc9000337f148 EFLAGS: 00000046
RAX: 0000000000000000 RBX: ffffea000105de80 RCX: dffffc0000000000
RDX: 0000000000000000 RSI: ffffffff8a7a43a0 RDI: ffffffff8a7a4360
RBP: 0000000000000000 R08: ffffffff8d8b0eef R09: 1ffffffff1b161dd
R10: dffffc0000000000 R11: fffffbfff1b161de R12: ffffea000105deb8
R13: 1ffffd400020bbd3 R14: 000000000004177a R15: ffffea000105de98
FS: 0000000000000000(0000) GS:ffff8880b9000000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f70e05b8ff8 CR3: 000000000c08e000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
RIP: 0010:page_expected_state mm/page_alloc.c:1160 [inline]
RIP: 0010:check_free_page mm/page_alloc.c:1205 [inline]
RIP: 0010:free_pages_prepare mm/page_alloc.c:1334 [inline]
RIP: 0010:free_pcp_prepare mm/page_alloc.c:1391 [inline]
RIP: 0010:free_unref_page_prepare+0xd8/0x6c0 mm/page_alloc.c:3317
Code: ff df 80 3c 08 00 74 08 4c 89 e7 e8 82 38 0a 00 49 8b 04 24 a8 01 0f 85 52 05 00 00 a8 02 74 0a 48 89 df 89 ee e8 78 c2 0e 00 <4c> 8d 63 30 4c 89 e7 be 04 00 00 00 e8 e7 39 0a 00 4c 89 e0 48 c1
RSP: 0018:ffffc9000337f178 EFLAGS: 00000246
free_unref_page_list+0x119/0x830 mm/page_alloc.c:3433
release_pages+0x185f/0x1bd0 mm/swap.c:963
__pagevec_release+0x6d/0xe0 mm/swap.c:983
pagevec_release include/linux/pagevec.h:81 [inline]
shmem_undo_range+0x5cd/0x19a0 mm/shmem.c:964
shmem_truncate_range mm/shmem.c:1063 [inline]
shmem_evict_inode+0x1e2/0x9a0 mm/shmem.c:1145
evict+0x4b6/0x8b0 fs/inode.c:647
__dentry_kill+0x412/0x630 fs/dcache.c:586
dentry_kill+0xb8/0x290 fs/dcache.c:-1
dput+0xd8/0x1a0 fs/dcache.c:893
__fput+0x5a5/0x8c0 fs/file_table.c:319
task_work_run+0x125/0x1a0 kernel/task_work.c:188
exit_task_work include/linux/task_work.h:33 [inline]
do_exit+0x635/0x2110 kernel/exit.c:890
do_group_exit+0x12c/0x2f0 kernel/exit.c:1004
get_signal+0x7eb/0x12e0 kernel/signal.c:2909
arch_do_signal_or_restart+0xe6/0x12a0 arch/x86/kernel/signal.c:867
handle_signal_work kernel/entry/common.c:154 [inline]
exit_to_user_mode_loop+0x9e/0x130 kernel/entry/common.c:178
exit_to_user_mode_prepare+0xee/0x180 kernel/entry/common.c:214
__syscall_exit_to_user_mode_work kernel/entry/common.c:296 [inline]
syscall_exit_to_user_mode+0x16/0x40 kernel/entry/common.c:307
do_syscall_64+0x58/0xa0 arch/x86/entry/common.c:86
entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f70e2382159
Code: Unable to access opcode bytes at RIP 0x7f70e238212f.
RSP: 002b:00007f70e05b9028 EFLAGS: 00000246 ORIG_RAX: 000000000000012b
RAX: 0000000000010106 RBX: 00007f70e260a090 RCX: 00007f70e2382159
RDX: 0000000000010106 RSI: 00002000000000c0 RDI: 0000000000000006
RBP: 00007f70e2419024 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000002 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f70e260a128 R14: 00007f70e260a090 R15: 00007ffca11deee8