INFO: task syz-executor129:5628 blocked for more than 143 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor129 state:D stack:27512 pid:5628 tgid:5628 ppid:5625 task_flags:0x400040 flags:0x00080002
Call Trace:
context_switch kernel/sched/core.c:5533 [inline]
__schedule+0x16d9/0x5700 kernel/sched/core.c:7284
__schedule_loop kernel/sched/core.c:7361 [inline]
rt_mutex_schedule+0x76/0xf0 kernel/sched/core.c:7668
rt_mutex_slowlock_block kernel/locking/rtmutex.c:1670 [inline]
__rt_mutex_slowlock kernel/locking/rtmutex.c:1747 [inline]
__rt_mutex_slowlock_locked+0x1f88/0x25b0 kernel/locking/rtmutex.c:1787
rt_mutex_slowlock+0xbd/0x180 kernel/locking/rtmutex.c:1827
__rt_mutex_lock kernel/locking/rtmutex.c:1842 [inline]
rwbase_write_lock+0x14c/0x720 kernel/locking/rwbase_rt.c:251
inode_lock include/linux/fs.h:1024 [inline]
blkdev_fallocate+0x263/0x550 block/fops.c:889
vfs_fallocate+0x663/0x7f0 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+0xbf/0x110 fs/open.c:365
do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f521dde7579
RSP: 002b:00007fff2dacc3f8 EFLAGS: 00000246 ORIG_RAX: 000000000000011d
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f521dde7579
RDX: 0000000000000600 RSI: 0000000000000011 RDI: 0000000000000003
RBP: 00000000000f4240 R08: 0000000000000009 R09: 0000000000000009
R10: 000000800007c000 R11: 0000000000000246 R12: 00007fff2dacc578
R13: 0000000000000002 R14: 00007fff2dacc420 R15: 00007fff2dacc410
INFO: task syz-executor129:5630 blocked for more than 143 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor129 state:D stack:28264 pid:5630 tgid:5630 ppid:5627 task_flags:0x400040 flags:0x00080002
Call Trace:
context_switch kernel/sched/core.c:5533 [inline]
__schedule+0x16d9/0x5700 kernel/sched/core.c:7284
__schedule_loop kernel/sched/core.c:7361 [inline]
rt_mutex_schedule+0x76/0xf0 kernel/sched/core.c:7668
rt_mutex_slowlock_block kernel/locking/rtmutex.c:1670 [inline]
__rt_mutex_slowlock kernel/locking/rtmutex.c:1747 [inline]
__rt_mutex_slowlock_locked+0x1f88/0x25b0 kernel/locking/rtmutex.c:1787
rt_mutex_slowlock+0xbd/0x180 kernel/locking/rtmutex.c:1827
__rt_mutex_lock kernel/locking/rtmutex.c:1842 [inline]
rwbase_write_lock+0x14c/0x720 kernel/locking/rwbase_rt.c:251
inode_lock include/linux/fs.h:1024 [inline]
blkdev_fallocate+0x263/0x550 block/fops.c:889
vfs_fallocate+0x663/0x7f0 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+0xbf/0x110 fs/open.c:365
do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f521dde7579
RSP: 002b:00007fff2dacc3f8 EFLAGS: 00000246 ORIG_RAX: 000000000000011d
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f521dde7579
RDX: 0000000000000600 RSI: 0000000000000011 RDI: 0000000000000003
RBP: 00000000000f4240 R08: 0000000000000009 R09: 0000000000000009
R10: 000000800007c000 R11: 0000000000000246 R12: 00007fff2dacc578
R13: 0000000000000002 R14: 00007fff2dacc420 R15: 00007fff2dacc410
INFO: task syz-executor129:5631 blocked for more than 143 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor129 state:D stack:28264 pid:5631 tgid:5631 ppid:5629 task_flags:0x400040 flags:0x00080002
Call Trace:
context_switch kernel/sched/core.c:5533 [inline]
__schedule+0x16d9/0x5700 kernel/sched/core.c:7284
__schedule_loop kernel/sched/core.c:7361 [inline]
rt_mutex_schedule+0x76/0xf0 kernel/sched/core.c:7668
rt_mutex_slowlock_block kernel/locking/rtmutex.c:1670 [inline]
__rt_mutex_slowlock kernel/locking/rtmutex.c:1747 [inline]
__rt_mutex_slowlock_locked+0x1f88/0x25b0 kernel/locking/rtmutex.c:1787
rt_mutex_slowlock+0xbd/0x180 kernel/locking/rtmutex.c:1827
__rt_mutex_lock kernel/locking/rtmutex.c:1842 [inline]
rwbase_write_lock+0x14c/0x720 kernel/locking/rwbase_rt.c:251
inode_lock include/linux/fs.h:1024 [inline]
blkdev_fallocate+0x263/0x550 block/fops.c:889
vfs_fallocate+0x663/0x7f0 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+0xbf/0x110 fs/open.c:365
do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f521dde7579
RSP: 002b:00007fff2dacc3f8 EFLAGS: 00000246 ORIG_RAX: 000000000000011d
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f521dde7579
RDX: 0000000000000600 RSI: 0000000000000011 RDI: 0000000000000003
RBP: 00000000000f4240 R08: 0000000000000009 R09: 0000000000000009
R10: 000000800007c000 R11: 0000000000000246 R12: 00007fff2dacc578
R13: 0000000000000002 R14: 00007fff2dacc420 R15: 00007fff2dacc410
Showing all locks held in the system:
locks held by khungtaskd/38: 1, last CPU#0:
#0: ffffffff8e1c3cc0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:309 [inline]
#0: ffffffff8e1c3cc0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
#0: ffffffff8e1c3cc0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180 kernel/locking/lockdep.c:6871
locks held by getty/5341: 2, on CPU#1:
#0: ffff888035b460a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
#1: ffffc900044c32e0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x460/0x1360 drivers/tty/n_tty.c:2211
locks held by syz-executor129/5626: 2, last CPU#1:
#0: ffff88802766d8c8 (&sb->s_type->i_mutex_key#9){++++}-{4:4}, at: inode_lock include/linux/fs.h:1024 [inline]
#0: ffff88802766d8c8 (&sb->s_type->i_mutex_key#9){++++}-{4:4}, at: blkdev_fallocate+0x263/0x550 block/fops.c:889
#1: ffff88802766da98 (mapping.invalidate_lock){++++}-{4:4}, at: filemap_invalidate_lock include/linux/fs.h:1079 [inline]
#1: ffff88802766da98 (mapping.invalidate_lock){++++}-{4:4}, at: blkdev_fallocate+0x294/0x550 block/fops.c:890
locks held by syz-executor129/5628: 1, on CPU#1:
#0: ffff88802766d8c8 (&sb->s_type->i_mutex_key#9){++++}-{4:4}, at: inode_lock include/linux/fs.h:1024 [inline]
#0: ffff88802766d8c8 (&sb->s_type->i_mutex_key#9){++++}-{4:4}, at: blkdev_fallocate+0x263/0x550 block/fops.c:889
locks held by syz-executor129/5630: 1, on CPU#0:
#0: ffff88802766d8c8 (&sb->s_type->i_mutex_key#9){++++}-{4:4}, at: inode_lock include/linux/fs.h:1024 [inline]
#0: ffff88802766d8c8 (&sb->s_type->i_mutex_key#9){++++}-{4:4}, at: blkdev_fallocate+0x263/0x550 block/fops.c:889
locks held by syz-executor129/5631: 1, on CPU#0:
#0: ffff88802766d8c8 (&sb->s_type->i_mutex_key#9){++++}-{4:4}, at: inode_lock include/linux/fs.h:1024 [inline]
#0: ffff88802766d8c8 (&sb->s_type->i_mutex_key#9){++++}-{4:4}, at: blkdev_fallocate+0x263/0x550 block/fops.c:889
locks held by syz-executor129/5657: 1, on CPU#0:
#0: ffff88802766d8c8 (&sb->s_type->i_mutex_key#9){++++}-{4:4}, at: inode_lock include/linux/fs.h:1024 [inline]
#0: ffff88802766d8c8 (&sb->s_type->i_mutex_key#9){++++}-{4:4}, at: blkdev_fallocate+0x263/0x550 block/fops.c:889
=============================================
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 38 Comm: khungtaskd Not tainted syzkaller #0 PREEMPT_{RT,(full)}
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026
Call Trace:
dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
nmi_cpu_backtrace+0x274/0x2d0 lib/nmi_backtrace.c:123
nmi_trigger_cpumask_backtrace+0x17d/0x390 lib/nmi_backtrace.c:66
trigger_all_cpu_backtrace include/linux/nmi.h:164 [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+0xfd7/0x1030 kernel/hung_task.c:561
kthread+0x38b/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: 5626 Comm: syz-executor129 Not tainted syzkaller #0 PREEMPT_{RT,(full)}
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026
RIP: 0010:arch_irqs_disabled_flags arch/x86/include/asm/irqflags.h:146 [inline]
RIP: 0010:arch_irqs_disabled arch/x86/include/asm/irqflags.h:153 [inline]
RIP: 0010:lock_release+0x277/0x3c0 kernel/locking/lockdep.c:5967
Code: e8 6e 31 00 00 48 8b 5c 24 08 48 c7 c7 15 10 ae 8d e8 1d f6 b6 09 b8 ff ff ff ff 65 0f c1 05 b0 e7 03 11 83 f8 01 75 2e 9c 58 00 02 00 00 75 42 f7 c3 00 02 00 00 75 47 65 48 8b 05 ca a1 03
RSP: 0018:ffffc90004cef9c8 EFLAGS: 00000046
RAX: 0000000000000046 RBX: 0000000000000206 RCX: 8000000000000001
RDX: 0000000000000000 RSI: ffffffff8dae1015 RDI: ffffffff8bcc4c80
RBP: ffff88803c4e2ba8 R08: 0000000000000000 R09: 0000000000000000
R10: dffffc0000000000 R11: fffff9400005bd39 R12: 0000000000000002
R13: 0000000000000002 R14: ffffffff8e1c3d80 R15: ffff88803c4e1f40
FS: 00005555708d1400(0000) GS:ffff888125cc2000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f521de863e0 CR3: 00000000331b0000 CR4: 00000000003526f0
Call Trace:
rcu_lock_release include/linux/rcupdate.h:319 [inline]
rcu_read_unlock_sched include/linux/rcupdate.h:971 [inline]
pfn_valid+0x420/0x4c0 include/linux/mmzone.h:2286
bvec_try_merge_page+0x11a/0x280 block/bio.c:956
bio_add_page+0x2eb/0x700 block/bio.c:1063
bio_add_folio+0x64/0x90 block/bio.c:1107
__blkdev_issue_zero_pages+0x2c4/0x3d0 block/blk-lib.c:209
blkdev_issue_zero_pages block/blk-lib.c:231 [inline]
blkdev_issue_zeroout+0x48e/0x600 block/blk-lib.c:312
blkdev_fallocate+0x472/0x550 block/fops.c:916
vfs_fallocate+0x663/0x7f0 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+0xbf/0x110 fs/open.c:365
do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f521dde7579
Code: c0 79 93 eb d5 48 8d 7c 1d 00 eb 99 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 d8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fff2dacc3f8 EFLAGS: 00000246 ORIG_RAX: 000000000000011d
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f521dde7579
RDX: 0000000000000600 RSI: 0000000000000011 RDI: 0000000000000003
RBP: 00000000000f4240 R08: 0000000000000009 R09: 0000000000000009
R10: 000000800007c000 R11: 0000000000000246 R12: 00007fff2dacc578
R13: 0000000000000002 R14: 00007fff2dacc420 R15: 00007fff2dacc410