syzbot

INFO: task syz.1.193:6623 blocked for more than 144 seconds.
      Not tainted 6.12.0-rc3-syzkaller-00007-g6485cf5ea253 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.1.193       state:D stack:25824 pid:6623  tgid:6623  ppid:5847   flags:0x00000004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5322 [inline]
 __schedule+0xef5/0x5750 kernel/sched/core.c:6682
 __schedule_loop kernel/sched/core.c:6759 [inline]
 schedule+0xe7/0x350 kernel/sched/core.c:6774
 io_schedule+0xbf/0x130 kernel/sched/core.c:7559
 folio_wait_bit_common+0x3d8/0x9b0 mm/filemap.c:1309
 __folio_lock mm/filemap.c:1647 [inline]
 folio_lock include/linux/pagemap.h:1148 [inline]
 folio_lock include/linux/pagemap.h:1144 [inline]
 __filemap_get_folio+0x6a4/0xaf0 mm/filemap.c:1900
 filemap_lock_folio include/linux/pagemap.h:788 [inline]
 filemap_lock_hugetlb_folio include/linux/hugetlb.h:795 [inline]
 hugetlb_fault+0x16ff/0x2fa0 mm/hugetlb.c:6406
 handle_mm_fault+0x930/0xaa0 mm/memory.c:6060
 do_user_addr_fault+0x60d/0x13f0 arch/x86/mm/fault.c:1338
 handle_page_fault arch/x86/mm/fault.c:1481 [inline]
 exc_page_fault+0x5c/0xc0 arch/x86/mm/fault.c:1539
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623
RIP: 0033:0x7f2590b45a98
RSP: 002b:00007ffd8d208ae8 EFLAGS: 00010246
RAX: 0000000020000640 RBX: 0000000000000004 RCX: 006b6e696c766564
RDX: 0000000000000008 RSI: 006b6e696c766564 RDI: 0000000020000640
RBP: 00007f2590d37a80 R08: 00007f2590a00000 R09: 0000000000000001
R10: 0000000000000001 R11: 0000000000000009 R12: 000000000003b6fc
R13: 00007ffd8d208bf0 R14: 0000000000000032 R15: fffffffffffffffe
 </TASK>
INFO: task syz.1.193:6630 blocked for more than 145 seconds.
      Not tainted 6.12.0-rc3-syzkaller-00007-g6485cf5ea253 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.1.193       state:D stack:27760 pid:6630  tgid:6623  ppid:5847   flags:0x00004006
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5322 [inline]
 __schedule+0xef5/0x5750 kernel/sched/core.c:6682
 __schedule_loop kernel/sched/core.c:6759 [inline]
 schedule+0xe7/0x350 kernel/sched/core.c:6774
 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6831
 __mutex_lock_common kernel/locking/mutex.c:684 [inline]
 __mutex_lock+0x5b8/0x9c0 kernel/locking/mutex.c:752
 hugetlb_wp+0x1b4a/0x3320 mm/hugetlb.c:5894
 hugetlb_fault+0x2248/0x2fa0 mm/hugetlb.c:6454
 handle_mm_fault+0x930/0xaa0 mm/memory.c:6060
 do_user_addr_fault+0x7a3/0x13f0 arch/x86/mm/fault.c:1389
 handle_page_fault arch/x86/mm/fault.c:1481 [inline]
 exc_page_fault+0x5c/0xc0 arch/x86/mm/fault.c:1539
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623
RIP: 0010:__put_user_8+0x11/0x20 arch/x86/lib/putuser.S:107
Code: 1f 84 00 00 00 00 00 66 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 48 89 cb 48 c1 fb 3f 48 09 d9 0f 01 cb <48> 89 01 31 c9 0f 01 ca c3 cc cc cc cc 66 90 90 90 90 90 90 90 90
RSP: 0018:ffffc900033cfcf8 EFLAGS: 00050202
RAX: 0000000000800000 RBX: 0000000000000000 RCX: 0000000020000020
RDX: 0000000000040000 RSI: ffffffff8218b0bf RDI: ffffffff8bd1a1c0
RBP: ffffc900033cfed0 R08: 0000000000000000 R09: fffffbfff20be7f1
R10: ffffffff905f3f8f R11: 0000000000000000 R12: 0000000000800000
R13: 0000000000000003 R14: 0000000000000000 R15: ffff88807e921600
 userfaultfd_copy fs/userfaultfd.c:1590 [inline]
 userfaultfd_ioctl+0x1e9b/0x3830 fs/userfaultfd.c:1988
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:907 [inline]
 __se_sys_ioctl fs/ioctl.c:893 [inline]
 __x64_sys_ioctl+0x18f/0x220 fs/ioctl.c:893
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f2590b7dff9
RSP: 002b:00007f25905de038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f2590d36058 RCX: 00007f2590b7dff9
RDX: 0000000020000000 RSI: 00000000c028aa03 RDI: 0000000000000007
RBP: 00007f2590bf0296 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f2590d36058 R15: 00007ffd8d208988
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/30:
 #0: ffffffff8e1b8340 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:337 [inline]
 #0: ffffffff8e1b8340 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
 #0: ffffffff8e1b8340 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x7f/0x390 kernel/locking/lockdep.c:6720
3 locks held by kworker/u8:9/3002:
 #0: ffff88814b78f948 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work+0x129b/0x1ba0 kernel/workqueue.c:3204
 #1: ffffc9000a337d80 ((work_completion)(&(&ifa->dad_work)->work)){+.+.}-{0:0}, at: process_one_work+0x921/0x1ba0 kernel/workqueue.c:3205
 #2: ffffffff8fee1768 (rtnl_mutex){+.+.}-{3:3}, at: addrconf_dad_work+0xcf/0x14d0 net/ipv6/addrconf.c:4196
2 locks held by kworker/u8:10/3096:
2 locks held by getty/4979:
 #0: ffff88814bbf90a0 (&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
3 locks held by kworker/1:4/5274:
 #0: ffff88801b080948 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x129b/0x1ba0 kernel/workqueue.c:3204
 #1: ffffc90004287d80 ((work_completion)(&data->fib_event_work)){+.+.}-{0:0}, at: process_one_work+0x921/0x1ba0 kernel/workqueue.c:3205
 #2: ffff88805ad55240 (&data->fib_lock){+.+.}-{3:3}, at: nsim_fib_event_work+0x1bb/0x26d0 drivers/net/netdevsim/fib.c:1488
3 locks held by syz.1.193/6623:
 #0: ffff888032a4a070 (&vma->vm_lock->lock){++++}-{3:3}, at: vma_start_read include/linux/mm.h:704 [inline]
 #0: ffff888032a4a070 (&vma->vm_lock->lock){++++}-{3:3}, at: lock_vma_under_rcu+0x13e/0x980 mm/memory.c:6228
 #1: ffff888140ae6698 (&hugetlb_fault_mutex_table[i]){+.+.}-{3:3}, at: hugetlb_fault+0x307/0x2fa0 mm/hugetlb.c:6326
 #2: ffff88807cfe18e8 (&resv_map->rw_sema){.+.+}-{3:3}, at: hugetlb_vma_lock_read mm/hugetlb.c:276 [inline]
 #2: ffff88807cfe18e8 (&resv_map->rw_sema){.+.+}-{3:3}, at: hugetlb_vma_lock_read+0x105/0x140 mm/hugetlb.c:267
2 locks held by syz.1.193/6630:
 #0: ffff88802ebf3118 (&mm->mmap_lock){++++}-{3:3}, at: mmap_read_trylock include/linux/mmap_lock.h:163 [inline]
 #0: ffff88802ebf3118 (&mm->mmap_lock){++++}-{3:3}, at: get_mmap_lock_carefully mm/memory.c:6099 [inline]
 #0: ffff88802ebf3118 (&mm->mmap_lock){++++}-{3:3}, at: lock_mm_and_find_vma+0x35/0x6a0 mm/memory.c:6159
 #1: ffff888140ae6698 (&hugetlb_fault_mutex_table[i]){+.+.}-{3:3}, at: hugetlb_wp+0x1b4a/0x3320 mm/hugetlb.c:5894
1 lock held by syz-executor/6653:
 #0: ffffffff8fee1768 (rtnl_mutex){+.+.}-{3:3}, at: tun_detach drivers/net/tun.c:698 [inline]
 #0: ffffffff8fee1768 (rtnl_mutex){+.+.}-{3:3}, at: tun_chr_close+0x38/0x230 drivers/net/tun.c:3517
2 locks held by syz-executor/6940:
 #0: ffffffff8fee1768 (rtnl_mutex){+.+.}-{3:3}, at: tun_detach drivers/net/tun.c:698 [inline]
 #0: ffffffff8fee1768 (rtnl_mutex){+.+.}-{3:3}, at: tun_chr_close+0x38/0x230 drivers/net/tun.c:3517
 #1: ffffffff8e1c3c38 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock+0x282/0x3b0 kernel/rcu/tree_exp.h:297
1 lock held by syz-executor/7215:
 #0: ffffffff8fee1768 (rtnl_mutex){+.+.}-{3:3}, at: tun_detach drivers/net/tun.c:698 [inline]
 #0: ffffffff8fee1768 (rtnl_mutex){+.+.}-{3:3}, at: tun_chr_close+0x38/0x230 drivers/net/tun.c:3517
1 lock held by syz-executor/8090:
 #0: ffffffff8fee1768 (rtnl_mutex){+.+.}-{3:3}, at: tun_detach drivers/net/tun.c:698 [inline]
 #0: ffffffff8fee1768 (rtnl_mutex){+.+.}-{3:3}, at: tun_chr_close+0x38/0x230 drivers/net/tun.c:3517
1 lock held by cmp/8362:

=============================================

NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 30 Comm: khungtaskd Not tainted 6.12.0-rc3-syzkaller-00007-g6485cf5ea253 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
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: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
 </TASK>
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 8154 Comm: syz-executor Not tainted 6.12.0-rc3-syzkaller-00007-g6485cf5ea253 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
RIP: 0010:stack_access_ok+0x16/0x200 arch/x86/kernel/unwind_orc.c:389
Code: 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 48 b8 00 00 00 00 00 fc ff df 41 57 41 56 4c 8d 77 08 41 55 41 54 <49> 89 d4 4c 89 f2 55 48 c1 ea 03 48 89 f5 53 48 89 fb 48 83 ec 08
RSP: 0018:ffffc900092e76a0 EFLAGS: 00000283
RAX: dffffc0000000000 RBX: 0000000000000001 RCX: ffffffff90fdc6ec
RDX: 0000000000000008 RSI: ffffc900092e7a20 RDI: ffffc900092e7738
RBP: ffffc900092e7a20 R08: 0000000000000001 R09: ffffffff90fdc6f0
R10: ffffc900092e7738 R11: 000000000000e1df R12: ffffc900092e7788
R13: ffffc900092e7738 R14: ffffc900092e7740 R15: ffffc900092e7a48
FS:  0000000000000000(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055fdb4644300 CR3: 000000000df7c000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <NMI>
 </NMI>
 <TASK>
 deref_stack_reg arch/x86/kernel/unwind_orc.c:403 [inline]
 unwind_next_frame+0x15dd/0x20c0 arch/x86/kernel/unwind_orc.c:648
 arch_stack_walk+0x95/0x100 arch/x86/kernel/stacktrace.c:25
 stack_trace_save+0x95/0xd0 kernel/stacktrace.c:122
 save_stack+0x162/0x1f0 mm/page_owner.c:156
 __reset_page_owner+0x8d/0x400 mm/page_owner.c:297
 reset_page_owner include/linux/page_owner.h:25 [inline]
 free_pages_prepare mm/page_alloc.c:1108 [inline]
 free_unref_page+0x5f4/0xdc0 mm/page_alloc.c:2638
 vfree+0x17a/0x890 mm/vmalloc.c:3361
 kcov_put kernel/kcov.c:439 [inline]
 kcov_put+0x2a/0x40 kernel/kcov.c:435
 kcov_close+0xd/0x20 kernel/kcov.c:535
 __fput+0x3f6/0xb60 fs/file_table.c:431
 task_work_run+0x14e/0x250 kernel/task_work.c:228
 exit_task_work include/linux/task_work.h:40 [inline]
 do_exit+0xadd/0x2d70 kernel/exit.c:939
 do_group_exit+0xd3/0x2a0 kernel/exit.c:1088
 get_signal+0x25fb/0x2770 kernel/signal.c:2917
 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: 0033:0x7f775777cadf
Code: Unable to access opcode bytes at 0x7f775777cab5.
RSP: 002b:00007ffc19f4e150 EFLAGS: 00000293 ORIG_RAX: 0000000000000001
RAX: 0000000000000001 RBX: 0000000000000005 RCX: 00007f775777cadf
RDX: 0000000000000001 RSI: 00007ffc19f4e1a0 RDI: 0000000000000005
RBP: 00007f77577f13ae R08: 0000000000000000 R09: 00007ffc19f4dfa7
R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000001
R13: 00007ffc19f4e1a0 R14: 00007f7758464620 R15: 0000000000000003
 </TASK>