INFO: task syz.2.706:8945 blocked for more than 143 seconds.
Not tainted 6.12.0-rc1-syzkaller-00031-ge32cde8d2bd7 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.2.706 state:D stack:28592 pid:8945 tgid:8942 ppid:5803 flags:0x00004004
Call Trace:
context_switch kernel/sched/core.c:5315 [inline]
__schedule+0xef5/0x5750 kernel/sched/core.c:6675
__schedule_loop kernel/sched/core.c:6752 [inline]
schedule+0xe7/0x350 kernel/sched/core.c:6767
schedule_timeout+0x258/0x2a0 kernel/time/timer.c:2591
do_wait_for_common kernel/sched/completion.c:95 [inline]
__wait_for_common+0x3e1/0x600 kernel/sched/completion.c:116
wait_for_common kernel/sched/completion.c:127 [inline]
wait_for_completion_state+0x1c/0x40 kernel/sched/completion.c:264
coredump_wait fs/coredump.c:418 [inline]
do_coredump+0x82f/0x4160 fs/coredump.c:575
get_signal+0x237c/0x26d0 kernel/signal.c:2902
arch_do_signal_or_restart+0x90/0x7e0 arch/x86/kernel/signal.c:337
exit_to_user_mode_loop kernel/entry/common.c:111 [inline]
exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline]
__syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
syscall_exit_to_user_mode+0x150/0x2a0 kernel/entry/common.c:218
do_syscall_64+0xda/0x250 arch/x86/entry/common.c:89
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fd28f37dff9
RSP: 002b:00007fd2901e80e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: ffffffffffffffda RBX: 00007fd28f536060 RCX: 00007fd28f37dff9
RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 00007fd28f536064
RBP: 00007fd28f536058 R08: 00007fd29020a080 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fd28f536064
R13: 0000000000000000 R14: 00007ffd9ab63630 R15: 00007ffd9ab63718
Showing all locks held in the system:
1 lock held by khungtaskd/30:
#0: ffffffff8ddb7800 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:337 [inline]
#0: ffffffff8ddb7800 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
#0: ffffffff8ddb7800 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x7f/0x390 kernel/locking/lockdep.c:6720
2 locks held by getty/4986:
#0: ffff88814bf870a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x24/0x80 drivers/tty/tty_ldisc.c:243
#1: ffffc90002f062f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0xfba/0x1480 drivers/tty/n_tty.c:2211
2 locks held by kworker/u8:21/6521:
#0: ffff88801ac89148 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work+0x1212/0x1b30 kernel/workqueue.c:3204
#1: ffffc900047dfd80 ((work_completion)(&sub_info->work)){+.+.}-{0:0}, at: process_one_work+0x8bb/0x1b30 kernel/workqueue.c:3205
2 locks held by syz.2.706/8943:
3 locks held by syz.0.1349/11915:
2 locks held by syz.3.1354/11922:
#0: ffff88807c9a8e08 (&sb->s_type->i_mutex_key#10){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:815 [inline]
#0: ffff88807c9a8e08 (&sb->s_type->i_mutex_key#10){+.+.}-{3:3}, at: __sock_release+0x86/0x270 net/socket.c:657
#1: ffffffff8ddc3178 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock+0x282/0x3b0 kernel/rcu/tree_exp.h:297
2 locks held by syz.2.1362/11962:
4 locks held by syz.1.1360/11966:
=============================================
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 30 Comm: khungtaskd Not tainted 6.12.0-rc1-syzkaller-00031-ge32cde8d2bd7 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
Call Trace:
__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:162 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:223 [inline]
watchdog+0xf0c/0x1240 kernel/hung_task.c:379
kthread+0x2c1/0x3a0 kernel/kthread.c:389
ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 11966 Comm: syz.1.1360 Not tainted 6.12.0-rc1-syzkaller-00031-ge32cde8d2bd7 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
RIP: 0010:lock_release+0x3c7/0x6f0 kernel/locking/lockdep.c:5849
Code: 0f 84 86 01 00 00 48 c7 c7 e0 cb 4c 8b e8 51 d6 a8 09 b8 ff ff ff ff 65 0f c1 05 ec 61 98 7e 83 f8 01 0f 85 fd 01 00 00 9c 58 c4 02 0f 85 e8 01 00 00 48 f7 04 24 00 02 00 00 74 01 fb 48 b8
RSP: 0018:ffffc9000251ed60 EFLAGS: 00000046
RAX: 0000000000000046 RBX: 1ffff920004a3dae RCX: ffffc9000251edb0
RDX: 1ffff1100db4f15a RSI: ffffffff8b4ccbe0 RDI: ffffffff8bb12060
RBP: 66aa2c548f5fde72 R08: 0000000000000000 R09: fffffbfff20398c1
R10: ffffffff901cc60f R11: 0000000000000000 R12: 0000000000000006
R13: 0000000000000007 R14: ffff88806da78ad8 R15: ffff88806da78000
FS: 00007f4ffe2356c0(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f4ffe2149a0 CR3: 000000005648e000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
rcu_lock_release include/linux/rcupdate.h:347 [inline]
rcu_read_unlock include/linux/rcupdate.h:880 [inline]
page_ref_add_unless.constprop.0+0xec/0x390 include/linux/page_ref.h:239
folio_ref_add_unless include/linux/page_ref.h:248 [inline]
folio_try_get include/linux/page_ref.h:264 [inline]
next_uptodate_folio+0xf6/0x4b0 mm/filemap.c:3505
filemap_map_pages+0x648/0x16a0 mm/filemap.c:3686
do_fault_around mm/memory.c:5240 [inline]
do_read_fault mm/memory.c:5273 [inline]
do_fault mm/memory.c:5416 [inline]
do_pte_missing+0xd91/0x3e50 mm/memory.c:3965
handle_pte_fault mm/memory.c:5751 [inline]
__handle_mm_fault+0x100a/0x2a10 mm/memory.c:5894
handle_mm_fault+0x3fa/0xaa0 mm/memory.c:6062
faultin_page mm/gup.c:1187 [inline]
__get_user_pages+0x90f/0x3b90 mm/gup.c:1485
__get_user_pages_locked mm/gup.c:1751 [inline]
get_dump_page+0xfb/0x220 mm/gup.c:2269
dump_user_range+0x135/0x8a0 fs/coredump.c:943
elf_core_dump+0x2766/0x3840 fs/binfmt_elf.c:2121
do_coredump+0x2c42/0x4160 fs/coredump.c:758
get_signal+0x237c/0x26d0 kernel/signal.c:2902
arch_do_signal_or_restart+0x90/0x7e0 arch/x86/kernel/signal.c:337
exit_to_user_mode_loop kernel/entry/common.c:111 [inline]
exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline]
irqentry_exit_to_user_mode+0x13f/0x280 kernel/entry/common.c:231
asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623
RIP: 0033:0x401000
Code: Unable to access opcode bytes at 0x400fd6.
RSP: 002b:000000000000000b EFLAGS: 00010246
RAX: 0000000000000000 RBX: 00007f4ffd536058 RCX: 00007f4ffd37dff9
RDX: ffffffff81000000 RSI: 0000000000000003 RDI: 0000004081000009
RBP: 00007f4ffd3f0296 R08: 0000000080000001 R09: 0000000000000000
R10: ffffffffffffffff R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f4ffd536058 R15: 00007ffccb1c69e8