syz-executor.3 invoked oom-killer: gfp_mask=0xcc0(GFP_KERNEL), order=0, oom_score_adj=1000
CPU: 0 PID: 6308 Comm: syz-executor.3 Not tainted 6.0.0-rc1-next-20220819-syzkaller #0
BUG: sleeping function called from invalid context at kernel/locking/rwsem.c:1521
in_atomic(): 0, irqs_disabled(): 1, non_block: 0, pid: 6308, name: syz-executor.3
preempt_count: 0, expected: 0
RCU nest depth: 0, expected: 0
3 locks held by syz-executor.3/6308:
 #0: ffff888017ab3228 (&mm->mmap_lock#2){++++}-{3:3}, at: mmap_read_lock include/linux/mmap_lock.h:117 [inline]
 #0: ffff888017ab3228 (&mm->mmap_lock#2){++++}-{3:3}, at: __mm_populate+0x25f/0x3d0 mm/gup.c:1669
 #1: ffffffff8c0fdc00 (memcg_oom_lock#2){+.+.}-{0:0}, at: mem_cgroup_oom mm/memcontrol.c:1876 [inline]
 #1: ffffffff8c0fdc00 (memcg_oom_lock#2){+.+.}-{0:0}, at: try_charge_memcg+0xe85/0x1300 mm/memcontrol.c:2675
 #2: ffffffff8c0780a8 (oom_lock){+.+.}-{3:3}, at: mem_cgroup_out_of_memory+0x8d/0x270 mm/memcontrol.c:1642
irq event stamp: 12500
hardirqs last  enabled at (12499): [<ffffffff81533e15>] raw_spin_rq_unlock_irq kernel/sched/sched.h:1352 [inline]
hardirqs last  enabled at (12499): [<ffffffff81533e15>] finish_lock_switch kernel/sched/core.c:4956 [inline]
hardirqs last  enabled at (12499): [<ffffffff81533e15>] finish_task_switch.isra.0+0x2b5/0xc70 kernel/sched/core.c:5074
hardirqs last disabled at (12500): [<ffffffff894c1738>] dump_stack_lvl+0x2e/0x134 lib/dump_stack.c:139
softirqs last  enabled at (12488): [<ffffffff81491a33>] invoke_softirq kernel/softirq.c:445 [inline]
softirqs last  enabled at (12488): [<ffffffff81491a33>] __irq_exit_rcu+0x123/0x180 kernel/softirq.c:650
softirqs last disabled at (12463): [<ffffffff81491a33>] invoke_softirq kernel/softirq.c:445 [inline]
softirqs last disabled at (12463): [<ffffffff81491a33>] __irq_exit_rcu+0x123/0x180 kernel/softirq.c:650
CPU: 0 PID: 6308 Comm: syz-executor.3 Not tainted 6.0.0-rc1-next-20220819-syzkaller #0

============================================
WARNING: possible recursive locking detected
6.0.0-rc1-next-20220819-syzkaller #0 Not tainted
--------------------------------------------
syz-executor.3/6308 is trying to acquire lock:
ffff888017ab3228 (&mm->mmap_lock#2){++++}-{3:3}, at: mmap_read_lock_killable include/linux/mmap_lock.h:126 [inline]
ffff888017ab3228 (&mm->mmap_lock#2){++++}-{3:3}, at: __access_remote_vm+0xac/0x6f0 mm/memory.c:5461

but task is already holding lock:
ffff888017ab3228 (&mm->mmap_lock#2){++++}-{3:3}, at: mmap_read_lock include/linux/mmap_lock.h:117 [inline]
ffff888017ab3228 (&mm->mmap_lock#2){++++}-{3:3}, at: __mm_populate+0x25f/0x3d0 mm/gup.c:1669

other info that might help us debug this:
 Possible unsafe locking scenario:

       CPU0
       ----
  lock(&mm->mmap_lock#2);
  lock(&mm->mmap_lock#2);

 *** DEADLOCK ***

 May be due to missing lock nesting notation

3 locks held by syz-executor.3/6308:
 #0: ffff888017ab3228 (&mm->mmap_lock#2){++++}-{3:3}, at: mmap_read_lock include/linux/mmap_lock.h:117 [inline]
 #0: ffff888017ab3228 (&mm->mmap_lock#2){++++}-{3:3}, at: __mm_populate+0x25f/0x3d0 mm/gup.c:1669
 #1: ffffffff8c0fdc00 (memcg_oom_lock#2){+.+.}-{0:0}, at: mem_cgroup_oom mm/memcontrol.c:1876 [inline]
 #1: ffffffff8c0fdc00 (memcg_oom_lock#2){+.+.}-{0:0}, at: try_charge_memcg+0xe85/0x1300 mm/memcontrol.c:2675
 #2: ffffffff8c0780a8 (oom_lock){+.+.}-{3:3}, at: mem_cgroup_out_of_memory+0x8d/0x270 mm/memcontrol.c:1642

stack backtrace:
CPU: 0 PID: 6308 Comm: syz-executor.3 Not tainted 6.0.0-rc1-next-20220819-syzkaller #0
syz-executor.3[6308] cmdline: 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/22/2022
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:122 [inline]
 dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:140
 print_deadlock_bug kernel/locking/lockdep.c:2988 [inline]
 check_deadlock kernel/locking/lockdep.c:3031 [inline]
 validate_chain kernel/locking/lockdep.c:3816 [inline]
 __lock_acquire.cold+0x116/0x3a7 kernel/locking/lockdep.c:5053
 lock_acquire kernel/locking/lockdep.c:5666 [inline]
 lock_acquire+0x1ab/0x570 kernel/locking/lockdep.c:5631
 down_read_killable+0x9b/0x490 kernel/locking/rwsem.c:1522
 mmap_read_lock_killable include/linux/mmap_lock.h:126 [inline]
 __access_remote_vm+0xac/0x6f0 mm/memory.c:5461
 get_mm_cmdline.part.0+0x217/0x620 fs/proc/base.c:299
 get_mm_cmdline fs/proc/base.c:367 [inline]
 get_task_cmdline_kernel+0x1d9/0x220 fs/proc/base.c:367
 dump_stack_print_cmdline.part.0+0x82/0x150 lib/dump_stack.c:61
 dump_stack_print_cmdline lib/dump_stack.c:89 [inline]
 dump_stack_print_info+0x185/0x190 lib/dump_stack.c:97
 __dump_stack lib/dump_stack.c:121 [inline]
 dump_stack_lvl+0xc1/0x134 lib/dump_stack.c:140
 __might_resched.cold+0x222/0x26b kernel/sched/core.c:9896
 down_read_killable+0x75/0x490 kernel/locking/rwsem.c:1521
 mmap_read_lock_killable include/linux/mmap_lock.h:126 [inline]
 __access_remote_vm+0xac/0x6f0 mm/memory.c:5461
 get_mm_cmdline.part.0+0x217/0x620 fs/proc/base.c:299
 get_mm_cmdline fs/proc/base.c:367 [inline]
 get_task_cmdline_kernel+0x1d9/0x220 fs/proc/base.c:367
 dump_stack_print_cmdline.part.0+0x82/0x150 lib/dump_stack.c:61
 dump_stack_print_cmdline lib/dump_stack.c:89 [inline]
 dump_stack_print_info+0x185/0x190 lib/dump_stack.c:97
 __dump_stack lib/dump_stack.c:121 [inline]
 dump_stack_lvl+0xc1/0x134 lib/dump_stack.c:140
 dump_header+0x10b/0x7f9 mm/oom_kill.c:460
 oom_kill_process.cold+0x10/0x15 mm/oom_kill.c:1036
 out_of_memory+0x358/0x14a0 mm/oom_kill.c:1174
 mem_cgroup_out_of_memory+0x206/0x270 mm/memcontrol.c:1652
 mem_cgroup_oom mm/memcontrol.c:1882 [inline]
 try_charge_memcg+0xf13/0x1300 mm/memcontrol.c:2675
 try_charge mm/memcontrol.c:2769 [inline]
 charge_memcg+0x31/0x320 mm/memcontrol.c:6816
 __mem_cgroup_charge+0x27/0x90 mm/memcontrol.c:6837
 mem_cgroup_charge include/linux/memcontrol.h:696 [inline]
 shmem_add_to_page_cache+0x9ea/0x1680 mm/shmem.c:718
 shmem_getpage_gfp+0x8af/0x1f30 mm/shmem.c:1950
 shmem_fault+0x1b4/0x750 mm/shmem.c:2127
 __do_fault+0x10d/0x610 mm/memory.c:4162
 do_read_fault mm/memory.c:4507 [inline]
 do_fault mm/memory.c:4636 [inline]
 handle_pte_fault mm/memory.c:4908 [inline]
 __handle_mm_fault+0x21c0/0x3a90 mm/memory.c:5050
 handle_mm_fault+0x1c8/0x780 mm/memory.c:5171
 faultin_page mm/gup.c:990 [inline]
 __get_user_pages+0x4f3/0xfd0 mm/gup.c:1219
 populate_vma_page_range+0x23d/0x320 mm/gup.c:1576
 __mm_populate+0x1ea/0x3d0 mm/gup.c:1689
 mm_populate include/linux/mm.h:2684 [inline]
 do_shmat+0xcd4/0x1110 ipc/shm.c:1657
 __do_sys_shmat ipc/shm.c:1685 [inline]
 __se_sys_shmat ipc/shm.c:1680 [inline]
 __x64_sys_shmat+0xcc/0x160 ipc/shm.c:1680
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f6eee089279
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 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f6eef159168 EFLAGS: 00000246 ORIG_RAX: 000000000000001e
RAX: ffffffffffffffda RBX: 00007f6eee19bf80 RCX: 00007f6eee089279
RDX: 0000000000004000 RSI: 0000000020080000 RDI: 00000000000000f3
RBP: 00007f6eee0e3189 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fff3e79cb8f R14: 00007f6eef159300 R15: 0000000000022000
 </TASK>
------------[ cut here ]------------
raw_local_irq_restore() called with IRQs enabled
WARNING: CPU: 1 PID: 6308 at kernel/locking/irqflag-debug.c:10 warn_bogus_irq_restore+0x1d/0x20 kernel/locking/irqflag-debug.c:10
Modules linked in:
CPU: 1 PID: 6308 Comm: syz-executor.3 Not tainted 6.0.0-rc1-next-20220819-syzkaller #0
syz-executor.3[6308] cmdline: 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/22/2022
RIP: 0010:warn_bogus_irq_restore+0x1d/0x20 kernel/locking/irqflag-debug.c:10
Code: ba ff cc cc cc cc cc cc cc cc cc cc cc 80 3d 6e 95 49 04 00 74 01 c3 48 c7 c7 a0 a3 ec 89 c6 05 5d 95 49 04 01 e8 ef ed ba ff <0f> 0b c3 44 8b 05 d5 cf 5e 04 55 53 65 48 8b 1c 25 80 6f 02 00 45
RSP: 0018:ffffc9001299e6b8 EFLAGS: 00010282
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000040000 RSI: ffffffff816203c8 RDI: fffff52002533cc9
RBP: 0000000000000200 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000080000000 R11: 61636f6c5f776172 R12: ffffffff8a4c73c0
R13: ffff88801ca78000 R14: dffffc0000000000 R15: 0000000000000000
FS:  00007f6eef159700(0000) GS:ffff8880b9a00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005555561b7848 CR3: 0000000017a6b000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 dump_stack_lvl+0x111/0x134 lib/dump_stack.c:141
 print_deadlock_bug kernel/locking/lockdep.c:2988 [inline]
 check_deadlock kernel/locking/lockdep.c:3031 [inline]
 validate_chain kernel/locking/lockdep.c:3816 [inline]
 __lock_acquire.cold+0x116/0x3a7 kernel/locking/lockdep.c:5053
 lock_acquire kernel/locking/lockdep.c:5666 [inline]
 lock_acquire+0x1ab/0x570 kernel/locking/lockdep.c:5631
 down_read_killable+0x9b/0x490 kernel/locking/rwsem.c:1522
 mmap_read_lock_killable include/linux/mmap_lock.h:126 [inline]
 __access_remote_vm+0xac/0x6f0 mm/memory.c:5461
 get_mm_cmdline.part.0+0x217/0x620 fs/proc/base.c:299
 get_mm_cmdline fs/proc/base.c:367 [inline]
 get_task_cmdline_kernel+0x1d9/0x220 fs/proc/base.c:367
 dump_stack_print_cmdline.part.0+0x82/0x150 lib/dump_stack.c:61
 dump_stack_print_cmdline lib/dump_stack.c:89 [inline]
 dump_stack_print_info+0x185/0x190 lib/dump_stack.c:97
 __dump_stack lib/dump_stack.c:121 [inline]
 dump_stack_lvl+0xc1/0x134 lib/dump_stack.c:140
 __might_resched.cold+0x222/0x26b kernel/sched/core.c:9896
 down_read_killable+0x75/0x490 kernel/locking/rwsem.c:1521
 mmap_read_lock_killable include/linux/mmap_lock.h:126 [inline]
 __access_remote_vm+0xac/0x6f0 mm/memory.c:5461
 get_mm_cmdline.part.0+0x217/0x620 fs/proc/base.c:299
 get_mm_cmdline fs/proc/base.c:367 [inline]
 get_task_cmdline_kernel+0x1d9/0x220 fs/proc/base.c:367
 dump_stack_print_cmdline.part.0+0x82/0x150 lib/dump_stack.c:61
 dump_stack_print_cmdline lib/dump_stack.c:89 [inline]
 dump_stack_print_info+0x185/0x190 lib/dump_stack.c:97
 __dump_stack lib/dump_stack.c:121 [inline]
 dump_stack_lvl+0xc1/0x134 lib/dump_stack.c:140
 dump_header+0x10b/0x7f9 mm/oom_kill.c:460
 oom_kill_process.cold+0x10/0x15 mm/oom_kill.c:1036
 out_of_memory+0x358/0x14a0 mm/oom_kill.c:1174
 mem_cgroup_out_of_memory+0x206/0x270 mm/memcontrol.c:1652
 mem_cgroup_oom mm/memcontrol.c:1882 [inline]
 try_charge_memcg+0xf13/0x1300 mm/memcontrol.c:2675
 try_charge mm/memcontrol.c:2769 [inline]
 charge_memcg+0x31/0x320 mm/memcontrol.c:6816
 __mem_cgroup_charge+0x27/0x90 mm/memcontrol.c:6837
 mem_cgroup_charge include/linux/memcontrol.h:696 [inline]
 shmem_add_to_page_cache+0x9ea/0x1680 mm/shmem.c:718
 shmem_getpage_gfp+0x8af/0x1f30 mm/shmem.c:1950
 shmem_fault+0x1b4/0x750 mm/shmem.c:2127
 __do_fault+0x10d/0x610 mm/memory.c:4162
 do_read_fault mm/memory.c:4507 [inline]
 do_fault mm/memory.c:4636 [inline]
 handle_pte_fault mm/memory.c:4908 [inline]
 __handle_mm_fault+0x21c0/0x3a90 mm/memory.c:5050
 handle_mm_fault+0x1c8/0x780 mm/memory.c:5171
 faultin_page mm/gup.c:990 [inline]
 __get_user_pages+0x4f3/0xfd0 mm/gup.c:1219
 populate_vma_page_range+0x23d/0x320 mm/gup.c:1576
 __mm_populate+0x1ea/0x3d0 mm/gup.c:1689
 mm_populate include/linux/mm.h:2684 [inline]
 do_shmat+0xcd4/0x1110 ipc/shm.c:1657
 __do_sys_shmat ipc/shm.c:1685 [inline]
 __se_sys_shmat ipc/shm.c:1680 [inline]
 __x64_sys_shmat+0xcc/0x160 ipc/shm.c:1680
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f6eee089279
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 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f6eef159168 EFLAGS: 00000246 ORIG_RAX: 000000000000001e
RAX: ffffffffffffffda RBX: 00007f6eee19bf80 RCX: 00007f6eee089279
RDX: 0000000000004000 RSI: 0000000020080000 RDI: 00000000000000f3
RBP: 00007f6eee0e3189 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fff3e79cb8f R14: 00007f6eef159300 R15: 0000000000022000
 </TASK>