INFO: task syz.4.5702:28229 blocked for more than 143 seconds.
Not tainted 6.16.0-rc1-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.4.5702 state:D stack:27992 pid:28229 tgid:28226 ppid:17344 task_flags:0x400040 flags:0x20004004
Call Trace:
context_switch kernel/sched/core.c:5396 [inline]
__schedule+0x16f5/0x4d00 kernel/sched/core.c:6785
__schedule_loop kernel/sched/core.c:6863 [inline]
schedule+0x165/0x360 kernel/sched/core.c:6878
schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6935
rwsem_down_read_slowpath+0x552/0x880 kernel/locking/rwsem.c:1084
__down_read_common kernel/locking/rwsem.c:1248 [inline]
__down_read kernel/locking/rwsem.c:1261 [inline]
down_read+0x98/0x2e0 kernel/locking/rwsem.c:1526
i_mmap_lock_read include/linux/fs.h:565 [inline]
__rmap_walk_file+0x227/0x620 mm/rmap.c:2884
remove_migration_ptes mm/migrate.c:366 [inline]
unmap_and_move_huge_page mm/migrate.c:1459 [inline]
migrate_hugetlbs mm/migrate.c:1581 [inline]
migrate_pages+0xc98/0x2930 mm/migrate.c:2011
do_mbind mm/mempolicy.c:1542 [inline]
kernel_mbind mm/mempolicy.c:1685 [inline]
__do_sys_mbind mm/mempolicy.c:1759 [inline]
__se_sys_mbind+0xa3e/0xc30 mm/mempolicy.c:1755
do_syscall_32_irqs_on arch/x86/entry/syscall_32.c:83 [inline]
__do_fast_syscall_32+0xb6/0x2b0 arch/x86/entry/syscall_32.c:306
do_fast_syscall_32+0x34/0x80 arch/x86/entry/syscall_32.c:331
entry_SYSENTER_compat_after_hwframe+0x84/0x8e
RIP: 0023:0xf70ce539
RSP: 002b:00000000f509d55c EFLAGS: 00000206 ORIG_RAX: 0000000000000112
RAX: ffffffffffffffda RBX: 0000000080703000 RCX: 0000000000002000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00000000ffffffff
RBP: 0000000000000002 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
INFO: task syz.4.5702:28230 blocked for more than 144 seconds.
Not tainted 6.16.0-rc1-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.4.5702 state:D stack:27616 pid:28230 tgid:28226 ppid:17344 task_flags:0x400040 flags:0x20004004
Call Trace:
context_switch kernel/sched/core.c:5396 [inline]
__schedule+0x16f5/0x4d00 kernel/sched/core.c:6785
__schedule_loop kernel/sched/core.c:6863 [inline]
schedule+0x165/0x360 kernel/sched/core.c:6878
io_schedule+0x80/0xd0 kernel/sched/core.c:7723
folio_wait_bit_common+0x6b0/0xb90 mm/filemap.c:1317
__folio_lock mm/filemap.c:1675 [inline]
folio_lock include/linux/pagemap.h:1114 [inline]
__filemap_get_folio+0x139/0xaf0 mm/filemap.c:1928
filemap_lock_folio include/linux/pagemap.h:785 [inline]
filemap_lock_hugetlb_folio include/linux/hugetlb.h:817 [inline]
hugetlbfs_zero_partial_page+0xae/0x610 fs/hugetlbfs/inode.c:658
hugetlbfs_punch_hole fs/hugetlbfs/inode.c:712 [inline]
hugetlbfs_fallocate+0xb96/0x1100 fs/hugetlbfs/inode.c:745
vfs_fallocate+0x6a0/0x830 fs/open.c:341
madvise_remove mm/madvise.c:1041 [inline]
madvise_vma_behavior mm/madvise.c:1272 [inline]
madvise_walk_vmas mm/madvise.c:1539 [inline]
madvise_do_behavior+0x169d/0x2e70 mm/madvise.c:1731
do_madvise+0x174/0x220 mm/madvise.c:1824
__do_sys_madvise mm/madvise.c:1833 [inline]
__se_sys_madvise mm/madvise.c:1831 [inline]
__ia32_sys_madvise+0xa7/0xc0 mm/madvise.c:1831
do_syscall_32_irqs_on arch/x86/entry/syscall_32.c:83 [inline]
__do_fast_syscall_32+0xb6/0x2b0 arch/x86/entry/syscall_32.c:306
do_fast_syscall_32+0x34/0x80 arch/x86/entry/syscall_32.c:331
entry_SYSENTER_compat_after_hwframe+0x84/0x8e
RIP: 0023:0xf70ce539
RSP: 002b:00000000f507c55c EFLAGS: 00000206 ORIG_RAX: 00000000000000db
RAX: ffffffffffffffda RBX: 0000000080000000 RCX: 0000000000600002
RDX: 0000000000000009 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
INFO: task syz.4.5702:28228 blocked for more than 145 seconds.
Not tainted 6.16.0-rc1-syzkaller #0
Blocked by coredump.
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.4.5702 state:D stack:28456 pid:28228 tgid:28228 ppid:28229 task_flags:0x40004c flags:0x20004000
Call Trace:
context_switch kernel/sched/core.c:5396 [inline]
__schedule+0x16f5/0x4d00 kernel/sched/core.c:6785
__schedule_loop kernel/sched/core.c:6863 [inline]
schedule+0x165/0x360 kernel/sched/core.c:6878
schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6935
rwsem_down_write_slowpath+0xbec/0x1030 kernel/locking/rwsem.c:1176
__down_write_common kernel/locking/rwsem.c:1304 [inline]
__down_write kernel/locking/rwsem.c:1313 [inline]
down_write+0x1ab/0x1f0 kernel/locking/rwsem.c:1578
hugetlb_zap_begin include/linux/hugetlb.h:258 [inline]
unmap_vmas+0x23d/0x580 mm/memory.c:1984
exit_mmap+0x248/0xb50 mm/mmap.c:1284
__mmput+0x118/0x420 kernel/fork.c:1121
exit_mm+0x1da/0x2c0 kernel/exit.c:581
do_exit+0x640/0x22e0 kernel/exit.c:943
__do_sys_exit kernel/exit.c:1071 [inline]
__se_sys_exit kernel/exit.c:1069 [inline]
__ia32_sys_exit+0x40/0x40 kernel/exit.c:1069
ia32_sys_call+0x21a0/0x21c0 arch/x86/include/generated/asm/syscalls_32.h:2
do_syscall_32_irqs_on arch/x86/entry/syscall_32.c:83 [inline]
__do_fast_syscall_32+0xb6/0x2b0 arch/x86/entry/syscall_32.c:306
do_fast_syscall_32+0x34/0x80 arch/x86/entry/syscall_32.c:331
entry_SYSENTER_compat_after_hwframe+0x84/0x8e
RIP: 0023:0xf70ce539
RSP: 002b:00000000f50be51c EFLAGS: 00000206 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000000000
RDX: 000000004681cd00 RSI: 00000000f7432ff4 RDI: 00000000f72ce6e3
RBP: 00000000f70f4969 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
Showing all locks held in the system:
1 lock held by khungtaskd/31:
#0: ffffffff8e13eda0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
#0: ffffffff8e13eda0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:841 [inline]
#0: ffffffff8e13eda0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180 kernel/locking/lockdep.c:6770
2 locks held by getty/5596:
#0: ffff88814c8c50a0 (&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+0x43e/0x1400 drivers/tty/n_tty.c:2222
1 lock held by syz.4.5702/28229:
#0: ffff888058b63bc8 (&hugetlbfs_i_mmap_rwsem_key){++++}-{4:4}, at: i_mmap_lock_read include/linux/fs.h:565 [inline]
#0: ffff888058b63bc8 (&hugetlbfs_i_mmap_rwsem_key){++++}-{4:4}, at: __rmap_walk_file+0x227/0x620 mm/rmap.c:2884
3 locks held by syz.4.5702/28230:
#0: ffff88801a510428 (sb_writers#13){.+.+}-{0:0}, at: file_start_write include/linux/fs.h:3092 [inline]
#0: ffff88801a510428 (sb_writers#13){.+.+}-{0:0}, at: vfs_fallocate+0x62a/0x830 fs/open.c:340
#1: ffff888058b638f8 (&sb->s_type->i_mutex_key#19){++++}-{4:4}, at: inode_lock include/linux/fs.h:867 [inline]
#1: ffff888058b638f8 (&sb->s_type->i_mutex_key#19){++++}-{4:4}, at: hugetlbfs_punch_hole fs/hugetlbfs/inode.c:687 [inline]
#1: ffff888058b638f8 (&sb->s_type->i_mutex_key#19){++++}-{4:4}, at: hugetlbfs_fallocate+0x3cc/0x1100 fs/hugetlbfs/inode.c:745
#2: ffff888058b63bc8 (&hugetlbfs_i_mmap_rwsem_key){++++}-{4:4}, at: i_mmap_lock_write include/linux/fs.h:545 [inline]
#2: ffff888058b63bc8 (&hugetlbfs_i_mmap_rwsem_key){++++}-{4:4}, at: hugetlbfs_punch_hole fs/hugetlbfs/inode.c:695 [inline]
#2: ffff888058b63bc8 (&hugetlbfs_i_mmap_rwsem_key){++++}-{4:4}, at: hugetlbfs_fallocate+0x4b5/0x1100 fs/hugetlbfs/inode.c:745
3 locks held by syz.4.5702/28228:
#0: ffff8880770037a0 (&mm->mmap_lock){++++}-{4:4}, at: mmap_read_lock include/linux/mmap_lock.h:412 [inline]
#0: ffff8880770037a0 (&mm->mmap_lock){++++}-{4:4}, at: exit_mmap+0x12e/0xb50 mm/mmap.c:1269
#1: ffff88803394d278 (&vma_lock->rw_sema){++++}-{4:4}, at: hugetlb_vma_lock_write mm/hugetlb.c:-1 [inline]
#1: ffff88803394d278 (&vma_lock->rw_sema){++++}-{4:4}, at: __hugetlb_zap_begin+0x317/0x3a0 mm/hugetlb.c:6040
#2: ffff888058b63bc8 (&hugetlbfs_i_mmap_rwsem_key){++++}-{4:4}, at: hugetlb_zap_begin include/linux/hugetlb.h:258 [inline]
#2: ffff888058b63bc8 (&hugetlbfs_i_mmap_rwsem_key){++++}-{4:4}, at: unmap_vmas+0x23d/0x580 mm/memory.c:1984
=============================================
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 31 Comm: khungtaskd Not tainted 6.16.0-rc1-syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
Call Trace:
dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120
nmi_cpu_backtrace+0x39e/0x3d0 lib/nmi_backtrace.c:113
nmi_trigger_cpumask_backtrace+0x17a/0x300 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:158 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:307 [inline]
watchdog+0xfee/0x1030 kernel/hung_task.c:470
kthread+0x70e/0x8a0 kernel/kthread.c:464
ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148
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: 0 Comm: swapper/1 Not tainted 6.16.0-rc1-syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
RIP: 0010:pv_native_safe_halt+0x13/0x20 arch/x86/kernel/paravirt.c:82
Code: 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 a3 25 22 00 f3 0f 1e fa fb f4 cc cc cc cc cc cc cc cc cc cc cc cc 90 90 90 90 90 90 90 90 90
RSP: 0018:ffffc90000197de0 EFLAGS: 000002c2
RAX: 3174893aae55e000 RBX: ffffffff81976058 RCX: 3174893aae55e000
RDX: 0000000000000001 RSI: ffffffff8d9810bf RDI: ffffffff8be282c0
RBP: ffffc90000197f20 R08: ffff8880b8732f5b R09: 1ffff110170e65eb
R10: dffffc0000000000 R11: ffffed10170e65ec R12: ffffffff8fa108f0
R13: 0000000000000001 R14: 0000000000000001 R15: 1ffff11003a57b40
FS: 0000000000000000(0000) GS:ffff888125d52000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000f7485238 CR3: 0000000075dda000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
arch_safe_halt arch/x86/include/asm/paravirt.h:107 [inline]
default_idle+0x13/0x20 arch/x86/kernel/process.c:749
default_idle_call+0x74/0xb0 kernel/sched/idle.c:117
cpuidle_idle_call kernel/sched/idle.c:185 [inline]
do_idle+0x1e8/0x510 kernel/sched/idle.c:325
cpu_startup_entry+0x44/0x60 kernel/sched/idle.c:423
start_secondary+0x101/0x110 arch/x86/kernel/smpboot.c:315
common_startup_64+0x13e/0x147