INFO: task syz.4.4207:22356 blocked for more than 143 seconds.
      Not tainted 6.11.0-rc3-syzkaller-00010-g6b4aa469f049 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.4.4207      state:D stack:24672 pid:22356 tgid:22356 ppid:11778  flags:0x00000000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5188 [inline]
 __schedule+0x17ae/0x4a10 kernel/sched/core.c:6529
 __schedule_loop kernel/sched/core.c:6606 [inline]
 schedule+0x14b/0x320 kernel/sched/core.c:6621
 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6678
 rwsem_down_read_slowpath kernel/locking/rwsem.c:1086 [inline]
 __down_read_common kernel/locking/rwsem.c:1250 [inline]
 __down_read kernel/locking/rwsem.c:1263 [inline]
 down_read+0x705/0xa40 kernel/locking/rwsem.c:1528
 mmap_read_lock include/linux/mmap_lock.h:144 [inline]
 exit_mm+0xd4/0x310 kernel/exit.c:547
 do_exit+0x9b2/0x27f0 kernel/exit.c:869
 do_group_exit+0x207/0x2c0 kernel/exit.c:1031
 __do_sys_exit_group kernel/exit.c:1042 [inline]
 __se_sys_exit_group kernel/exit.c:1040 [inline]
 __x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1040
 x64_sys_call+0x2634/0x2640 arch/x86/include/generated/asm/syscalls_64.h:232
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f35631799f9
RSP: 002b:00007ffd000f69d8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f35631799f9
RDX: 0000000000000064 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007ffd000f6a2c R08: 0000000000000006 R09: 00000000001a7236
R10: 00000000003ffd84 R11: 0000000000000246 R12: 0000000000000031
R13: 00000000001a7236 R14: 00000000001a68d6 R15: 00007ffd000f6a80
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/30:
 #0: ffffffff8e7382e0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:326 [inline]
 #0: ffffffff8e7382e0 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:838 [inline]
 #0: ffffffff8e7382e0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x55/0x2a0 kernel/locking/lockdep.c:6626
2 locks held by getty/4973:
 #0: ffff88802b0e90a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
 #1: ffffc900031232f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x6ac/0x1e00 drivers/tty/n_tty.c:2211
1 lock held by syz.4.4207/22356:
 #0: ffff88802fdb9e18 (&mm->mmap_lock){++++}-{3:3}, at: mmap_read_lock include/linux/mmap_lock.h:144 [inline]
 #0: ffff88802fdb9e18 (&mm->mmap_lock){++++}-{3:3}, at: exit_mm+0xd4/0x310 kernel/exit.c:547
2 locks held by syz.4.4207/22357:
1 lock held by syz.1.4532/23662:

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

NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 30 Comm: khungtaskd Not tainted 6.11.0-rc3-syzkaller-00010-g6b4aa469f049 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/27/2024
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:93 [inline]
 dump_stack_lvl+0x241/0x360 lib/dump_stack.c:119
 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:223 [inline]
 watchdog+0xfee/0x1030 kernel/hung_task.c:379
 kthread+0x2f0/0x390 kernel/kthread.c:389
 ret_from_fork+0x4b/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: 22357 Comm: syz.4.4207 Not tainted 6.11.0-rc3-syzkaller-00010-g6b4aa469f049 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/27/2024
RIP: 0010:__sanitizer_cov_trace_const_cmp4+0x0/0x90 kernel/kcov.c:312
Code: 10 48 89 74 0a 18 4c 89 44 0a 20 c3 cc cc cc cc 66 2e 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 <f3> 0f 1e fa 4c 8b 04 24 65 48 8b 14 25 00 d7 03 00 65 8b 05 c0 5b
RSP: 0018:ffffc900034af658 EFLAGS: 00000246
RAX: 0000000000000000 RBX: 0000000000000005 RCX: 1ffff92000695ef5
RDX: ffffc9000948a000 RSI: 0000000000000004 RDI: 0000000000000000
RBP: ffffc900034af838 R08: ffffffff8143148d R09: 1ffffffff269e30e
R10: dffffc0000000000 R11: fffffbfff269e30f R12: 1ffff92000695ed8
R13: ffff8880ab917000 R14: ffffc900034af7b0 R15: 0000000000045b69
FS:  00007f3563e846c0(0000) GS:ffff8880b9300000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f69834e52d8 CR3: 000000005f7aa000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <NMI>
 </NMI>
 <TASK>
 __cpa_addr arch/x86/mm/pat/set_memory.c:296 [inline]
 cpa_flush arch/x86/mm/pat/set_memory.c:421 [inline]
 change_page_attr_set_clr+0x8b0/0xdb0 arch/x86/mm/pat/set_memory.c:1914
 cpa_set_pages_array arch/x86/mm/pat/set_memory.c:1936 [inline]
 _set_pages_array+0x10b/0x210 arch/x86/mm/pat/set_memory.c:2317
 drm_gem_shmem_get_pages+0x19c/0x290 drivers/gpu/drm/drm_gem_shmem_helper.c:192
 drm_gem_shmem_mmap+0x1a1/0x4d0 drivers/gpu/drm/drm_gem_shmem_helper.c:620
 drm_gem_mmap_obj+0x182/0x560 drivers/gpu/drm/drm_gem.c:1061
 drm_gem_mmap+0x4a0/0x7c0 drivers/gpu/drm/drm_gem.c:1139
 call_mmap include/linux/fs.h:2129 [inline]
 mmap_region+0xe8f/0x2090 mm/mmap.c:2957
 do_mmap+0x8f9/0x1010 mm/mmap.c:1468
 vm_mmap_pgoff+0x1dd/0x3d0 mm/util.c:588
 ksys_mmap_pgoff+0x4f1/0x720 mm/mmap.c:1514
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f35631799f9
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:00007f3563e84038 EFLAGS: 00000246 ORIG_RAX: 0000000000000009
RAX: ffffffffffffffda RBX: 00007f3563315f80 RCX: 00007f35631799f9
RDX: 0000000000000000 RSI: 0000000000001000 RDI: 0000000020ffc000
RBP: 00007f35631e78ee R08: 0000000000000003 R09: 00000001000f0000
R10: 0000000000000011 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f3563315f80 R15: 00007ffd000f6678
 </TASK>