INFO: task syz.0.1864:12058 blocked for more than 143 seconds.
Not tainted 6.16.0-rc6-next-20250718-syzkaller #0
Blocked by coredump.
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.0.1864 state:D stack:26440 pid:12058 tgid:12058 ppid:11539 task_flags:0x40004c flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:5351 [inline]
__schedule+0x1737/0x4d30 kernel/sched/core.c:6954
__schedule_loop kernel/sched/core.c:7036 [inline]
schedule+0x165/0x360 kernel/sched/core.c:7051
schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:7108
rwsem_down_read_slowpath+0x5fd/0x8f0 kernel/locking/rwsem.c:1088
__down_read_common kernel/locking/rwsem.c:1263 [inline]
__down_read kernel/locking/rwsem.c:1276 [inline]
down_read+0x98/0x2e0 kernel/locking/rwsem.c:1541
mmap_read_lock include/linux/mmap_lock.h:412 [inline]
exit_mm+0xcc/0x2c0 kernel/exit.c:557
do_exit+0x648/0x2300 kernel/exit.c:947
do_group_exit+0x21c/0x2d0 kernel/exit.c:1100
__do_sys_exit_group kernel/exit.c:1111 [inline]
__se_sys_exit_group kernel/exit.c:1109 [inline]
__x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1109
x64_sys_call+0x21f7/0x2200 arch/x86/include/generated/asm/syscalls_64.h:232
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f1889f8e9a9
RSP: 002b:00007ffd3920ce88 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f1889f8e9a9
RDX: 0000000000000064 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007ffd3920ceec R08: 000000123920cf7f R09: 00000000000927c0
R10: 00000000000001dc R11: 0000000000000246 R12: 0000000000000008
R13: 00000000000927c0 R14: 00000000000535d6 R15: 00007ffd3920cf40
Showing all locks held in the system:
1 lock held by khungtaskd/32:
#0: ffffffff8e53d8a0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
#0: ffffffff8e53d8a0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:841 [inline]
#0: ffffffff8e53d8a0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180 kernel/locking/lockdep.c:6770
4 locks held by kworker/u8:10/3022:
2 locks held by getty/5615:
#0: ffff88803345b0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
#1: ffffc900036cb2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x43e/0x1400 drivers/tty/n_tty.c:2222
1 lock held by syz.0.1864/12058:
#0: ffff888030879760 (&mm->mmap_lock){++++}-{4:4}, at: mmap_read_lock include/linux/mmap_lock.h:412 [inline]
#0: ffff888030879760 (&mm->mmap_lock){++++}-{4:4}, at: exit_mm+0xcc/0x2c0 kernel/exit.c:557
1 lock held by syz.0.1864/12059:
=============================================
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 32 Comm: khungtaskd Not tainted 6.16.0-rc6-next-20250718-syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
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:160 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:328 [inline]
watchdog+0xf93/0xfe0 kernel/hung_task.c:491
kthread+0x70e/0x8a0 kernel/kthread.c:463
ret_from_fork+0x3f9/0x770 arch/x86/kernel/process.c:148
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: 12059 Comm: syz.0.1864 Not tainted 6.16.0-rc6-next-20250718-syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
RIP: 0010:mas_validate_limits lib/maple_tree.c:7495 [inline]
RIP: 0010:mt_validate+0xc1b/0x4380 lib/maple_tree.c:7609
Code: 47 f6 48 85 db 0f 94 c0 44 08 f8 3c 01 0f 85 9e 00 00 00 e8 17 d7 47 f6 4c 89 f7 4c 89 ee e8 6c d9 47 f6 4d 39 ee 4c 8b 3c 24 <0f> 87 42 01 00 00 e8 fa d6 47 f6 4c 8b b4 24 30 01 00 00 4c 89 ef
RSP: 0018:ffffc9000a87f280 EFLAGS: 00000287
RAX: ffffffff8b782a04 RBX: 000000000000000b RCX: ffff88802e885a00
RDX: 0000000000000002 RSI: 00001ffc9e406fff RDI: 00001ffc9e405fff
RBP: ffffc9000a87f450 R08: ffff88802e885a00 R09: 0000000000000004
R10: 0000000000000003 R11: 0000000000000002 R12: ffff888011b74660
R13: 00001ffc9e406fff R14: 00001ffc9e405fff R15: 0000000000000001
FS: 00007f188aed26c0(0000) GS:ffff8881257ab000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005555702225c8 CR3: 000000006a52c000 CR4: 00000000003526f0
DR0: 000000000000f616 DR1: 0000000000001000 DR2: 8000000000000000
DR3: 000000010000000f DR6: 00000000ffff0ff0 DR7: 0000000000000400
Call Trace:
validate_mm+0xb6/0x4b0 mm/vma.c:651
vma_link+0x366/0x450 mm/vma.c:1799
copy_vma+0x70c/0x940 mm/vma.c:1880
copy_vma_and_data mm/mremap.c:1184 [inline]
move_vma+0x81f/0x1840 mm/mremap.c:1282
mremap_to+0x6d6/0x7a0 mm/mremap.c:1406
remap_move mm/mremap.c:1863 [inline]
do_mremap mm/mremap.c:1906 [inline]
__do_sys_mremap mm/mremap.c:1970 [inline]
__se_sys_mremap+0xa0b/0xef0 mm/mremap.c:1938
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f1889f8e9a9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f188aed2038 EFLAGS: 00000246 ORIG_RAX: 0000000000000019
RAX: ffffffffffffffda RBX: 00007f188a1b5fa0 RCX: 00007f1889f8e9a9
RDX: 0000000000001000 RSI: 0000000000001000 RDI: 0000200000ffc000
RBP: 00007f188a010d69 R08: 0000200000ffd000 R09: 0000000000000000
R10: 0000000000000007 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f188a1b5fa0 R15: 00007ffd3920cb28