INFO: task syz.2.3552:26169 blocked for more than 143 seconds.
Not tainted 6.14.0-rc7-syzkaller-00069-g81e4f8d68c66 #0
Blocked by coredump.
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.2.3552 state:D stack:25840 pid:26169 tgid:26166 ppid:22377 task_flags:0x400548 flags:0x00024000
Call Trace:
context_switch kernel/sched/core.c:5378 [inline]
__schedule+0x190e/0x4c90 kernel/sched/core.c:6765
__schedule_loop kernel/sched/core.c:6842 [inline]
schedule+0x14b/0x320 kernel/sched/core.c:6857
schedule_timeout+0xb0/0x290 kernel/time/sleep_timeout.c:75
do_wait_for_common kernel/sched/completion.c:95 [inline]
__wait_for_common kernel/sched/completion.c:116 [inline]
wait_for_common kernel/sched/completion.c:127 [inline]
wait_for_completion+0x355/0x620 kernel/sched/completion.c:148
io_wq_exit_workers io_uring/io-wq.c:1262 [inline]
io_wq_put_and_exit+0x344/0x720 io_uring/io-wq.c:1290
io_uring_clean_tctx+0x168/0x1e0 io_uring/tctx.c:205
io_uring_cancel_generic+0x751/0x800 io_uring/io_uring.c:3183
io_uring_files_cancel include/linux/io_uring.h:19 [inline]
do_exit+0x6a3/0x2940 kernel/exit.c:894
do_group_exit+0x207/0x2c0 kernel/exit.c:1087
get_signal+0x168c/0x1720 kernel/signal.c:3036
arch_do_signal_or_restart+0x96/0x860 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:329 [inline]
__syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
syscall_exit_to_user_mode+0xce/0x340 kernel/entry/common.c:218
do_syscall_64+0x100/0x230 arch/x86/entry/common.c:89
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f363098d169
RSP: 002b:00007f36318a60e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 00007f3630ba6088 RCX: 00007f363098d169
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f3630ba6088
RBP: 00007f3630ba6080 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f3630ba608c
R13: 0000000000000000 R14: 00007f3630ccf940 R15: 00007f3630ccfa28
Showing all locks held in the system:
1 lock held by khungtaskd/31:
#0: ffffffff8eb393e0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:337 [inline]
#0: ffffffff8eb393e0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
#0: ffffffff8eb393e0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x55/0x2a0 kernel/locking/lockdep.c:6746
3 locks held by kworker/u8:6/1155:
2 locks held by getty/5591:
#0: ffff888035a790a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
#1: ffffc90002fde2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x616/0x1770 drivers/tty/n_tty.c:2211
1 lock held by iou-wrk-26169/26177:
1 lock held by syz.7.4076/29468:
2 locks held by syz.3.4085/29511:
5 locks held by syz.7.4099/29562:
4 locks held by syz.1.4104/29579:
5 locks held by syz.0.4108/29602:
4 locks held by cmp/29606:
=============================================
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 31 Comm: khungtaskd Not tainted 6.14.0-rc7-syzkaller-00069-g81e4f8d68c66 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
Call Trace:
__dump_stack lib/dump_stack.c:94 [inline]
dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120
nmi_cpu_backtrace+0x49c/0x4d0 lib/nmi_backtrace.c:113
nmi_trigger_cpumask_backtrace+0x198/0x320 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:162 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:236 [inline]
watchdog+0x1058/0x10a0 kernel/hung_task.c:399
kthread+0x7a9/0x920 kernel/kthread.c:464
ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:148
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 29579 Comm: syz.1.4104 Not tainted 6.14.0-rc7-syzkaller-00069-g81e4f8d68c66 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
RIP: 0010:rcu_is_watching+0x1c/0xb0 kernel/rcu/tree.c:716
Code: 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 41 57 41 56 53 65 ff 05 f8 96 5c 7e e8 9b db 61 0a 89 c3 83 f8 08 73 7a <49> bf 00 00 00 00 00 fc ff df 4c 8d 34 dd 50 2b 55 8e 4c 89 f0 48
RSP: 0018:ffffc90004a971d0 EFLAGS: 00000297
RAX: 0000000000000001 RBX: 0000000000000001 RCX: ffff888035ab3c00
RDX: ffff888035ab3c00 RSI: ffffffff8c810080 RDI: ffffffff8c810040
RBP: 0000000000000001 R08: ffffffff8234eee1 R09: 1ffffffff28a9b08
R10: dffffc0000000000 R11: fffffbfff28a9b09 R12: 1ffff11010e1fbd5
R13: dffffc0000000000 R14: ffffffff8234eeb0 R15: ffffea0001ac5700
FS: 0000000000000000(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fd0a03158e5 CR3: 00000000808c0000 CR4: 00000000003526f0
DR0: 000000000000007b DR1: 0000000000000000 DR2: 000000000000e74f
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Call Trace:
rcu_read_lock include/linux/rcupdate.h:850 [inline]
page_ext_get+0x5a/0x2a0 mm/page_ext.c:525
page_table_check_clear+0x4b/0x550 mm/page_table_check.c:74
get_and_clear_full_ptes include/linux/pgtable.h:712 [inline]
zap_present_folio_ptes mm/memory.c:1510 [inline]
zap_present_ptes mm/memory.c:1595 [inline]
do_zap_pte_range mm/memory.c:1697 [inline]
zap_pte_range mm/memory.c:1741 [inline]
zap_pmd_range mm/memory.c:1833 [inline]
zap_pud_range mm/memory.c:1862 [inline]
zap_p4d_range mm/memory.c:1883 [inline]
unmap_page_range+0x33fa/0x4510 mm/memory.c:1904
unmap_vmas+0x3cc/0x5f0 mm/memory.c:1994
exit_mmap+0x283/0xd40 mm/mmap.c:1284
__mmput+0x115/0x420 kernel/fork.c:1356
exit_mm+0x220/0x310 kernel/exit.c:570
do_exit+0x9ad/0x2940 kernel/exit.c:925
do_group_exit+0x207/0x2c0 kernel/exit.c:1087
get_signal+0x168c/0x1720 kernel/signal.c:3036
arch_do_signal_or_restart+0x96/0x860 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:329 [inline]
__syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
syscall_exit_to_user_mode+0xce/0x340 kernel/entry/common.c:218
do_syscall_64+0x100/0x230 arch/x86/entry/common.c:89
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fdf3458d169
Code: Unable to access opcode bytes at 0x7fdf3458d13f.
RSP: 002b:00007fdf353390e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 00007fdf347a5fa8 RCX: 00007fdf3458d169
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007fdf347a5fa8
RBP: 00007fdf347a5fa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fdf347a5fac
R13: 0000000000000000 R14: 00007fdf348cf940 R15: 00007fdf348cfa28