syzbot

INFO: task syz.0.1650:14496 blocked for more than 143 seconds.
      Not tainted 6.17.0-rc1-syzkaller-00224-g8d561baae505 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.0.1650      state:D stack:26768 pid:14496 tgid:14480 ppid:5858   task_flags:0x400040 flags:0x00004004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5357 [inline]
 __schedule+0x1190/0x5de0 kernel/sched/core.c:6961
 __schedule_loop kernel/sched/core.c:7043 [inline]
 schedule+0xe7/0x3a0 kernel/sched/core.c:7058
 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:7115
 __mutex_lock_common kernel/locking/mutex.c:676 [inline]
 __mutex_lock+0x81b/0x1060 kernel/locking/mutex.c:760
 nfsd_nl_version_get_doit+0x18a/0x800 fs/nfsd/nfsctl.c:1844
 genl_family_rcv_msg_doit+0x206/0x2f0 net/netlink/genetlink.c:1115
 genl_family_rcv_msg net/netlink/genetlink.c:1195 [inline]
 genl_rcv_msg+0x55c/0x800 net/netlink/genetlink.c:1210
 netlink_rcv_skb+0x155/0x420 net/netlink/af_netlink.c:2552
 genl_rcv+0x28/0x40 net/netlink/genetlink.c:1219
 netlink_unicast_kernel net/netlink/af_netlink.c:1320 [inline]
 netlink_unicast+0x5aa/0x870 net/netlink/af_netlink.c:1346
 netlink_sendmsg+0x8d1/0xdd0 net/netlink/af_netlink.c:1896
 sock_sendmsg_nosec net/socket.c:714 [inline]
 __sock_sendmsg net/socket.c:729 [inline]
 ____sys_sendmsg+0xa95/0xc70 net/socket.c:2614
 ___sys_sendmsg+0x134/0x1d0 net/socket.c:2668
 __sys_sendmsg+0x16d/0x220 net/socket.c:2700
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xcd/0x490 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fbbac78ebe9
RSP: 002b:00007fbbad65b038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007fbbac9b6270 RCX: 00007fbbac78ebe9
RDX: 0000000020008040 RSI: 00002000000000c0 RDI: 0000000000000003
RBP: 00007fbbac811e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fbbac9b6308 R14: 00007fbbac9b6270 R15: 00007fff3daa2008
 </TASK>
INFO: lockdep is turned off.
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 31 Comm: khungtaskd Not tainted 6.17.0-rc1-syzkaller-00224-g8d561baae505 #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120
 nmi_cpu_backtrace+0x27b/0x390 lib/nmi_backtrace.c:113
 nmi_trigger_cpumask_backtrace+0x29c/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+0xf0e/0x1260 kernel/hung_task.c:491
 kthread+0x3c2/0x780 kernel/kthread.c:463
 ret_from_fork+0x5d4/0x6f0 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 24968 Comm: syz.6.2189 Not tainted 6.17.0-rc1-syzkaller-00224-g8d561baae505 #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
RIP: 0010:put_page_testzero include/linux/mm.h:1036 [inline]
RIP: 0010:folio_put_testzero include/linux/mm.h:1042 [inline]
RIP: 0010:folio_put include/linux/mm.h:1359 [inline]
RIP: 0010:filemap_map_pages+0x5c2/0x1670 mm/filemap.c:3788
Code: e8 b3 0e 2f 00 48 89 d8 48 c1 e8 03 42 0f b6 14 38 48 89 d8 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 84 0e 00 00 41 8b 5d 34 <31> ff 89 de e8 45 a4 c9 ff 85 db 0f 84 63 07 00 00 e8 f8 a8 c9 ff
RSP: 0018:ffffc9002aa0eaf0 EFLAGS: 00000246
RAX: 0000000000000007 RBX: 0000000000000004 RCX: ffffffff81f1654d
RDX: 0000000000000000 RSI: 0000000000000004 RDI: ffffea000118fab4
RBP: 0000000000001c23 R08: 0000000000000000 R09: fffff94000231f56
R10: ffffea000118fab7 R11: 0000000000000000 R12: 0000000000000000
R13: ffffea000118fa80 R14: ffffc9002aa0ee08 R15: dffffc0000000000
FS:  00007effd879c6c0(0000) GS:ffff8881246c4000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000007d8000 CR3: 00000000950c4000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 do_fault_around mm/memory.c:5531 [inline]
 do_read_fault mm/memory.c:5564 [inline]
 do_fault mm/memory.c:5707 [inline]
 do_pte_missing+0xe39/0x3ba0 mm/memory.c:4234
 handle_pte_fault mm/memory.c:6052 [inline]
 __handle_mm_fault+0x152a/0x2a50 mm/memory.c:6195
 handle_mm_fault+0x589/0xd10 mm/memory.c:6364
 faultin_page mm/gup.c:1144 [inline]
 __get_user_pages+0x551/0x34a0 mm/gup.c:1446
 __get_user_pages_locked mm/gup.c:1712 [inline]
 get_dump_page+0x257/0x3d0 mm/gup.c:2212
 dump_user_range+0x195/0xb70 fs/coredump.c:1364
 elf_core_dump+0x2929/0x3b60 fs/binfmt_elf.c:2085
 coredump_write fs/coredump.c:1049 [inline]
 vfs_coredump+0x2b9f/0x56d0 fs/coredump.c:1168
 get_signal+0x22e3/0x26d0 kernel/signal.c:3019
 arch_do_signal_or_restart+0x8f/0x790 arch/x86/kernel/signal.c:337
 exit_to_user_mode_loop kernel/entry/common.c:40 [inline]
 exit_to_user_mode_prepare include/linux/irq-entry-common.h:225 [inline]
 irqentry_exit_to_user_mode+0x12a/0x270 kernel/entry/common.c:73
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623
RIP: 0033:0xf4f33
Code: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 <00> 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
RSP: 002b:0000200000000098 EFLAGS: 00010217
RAX: 0000000000000000 RBX: 00007effd7bb5fa0 RCX: 00007effd798ebe9
RDX: 00002000000000c0 RSI: 0000200000000090 RDI: 0000000004004000
RBP: 00007effd7a11e19 R08: 0000200000000240 R09: 0000200000000240
R10: 0000200000000100 R11: 0000000000000206 R12: 0000000000000000
R13: 00007effd7bb6038 R14: 00007effd7bb5fa0 R15: 00007ffdace7b6a8
 </TASK>